Professor Paul Tasker
BSc, PhD, FIET, FIEEE FLSW

Professor

Prof. Paul J Tasker joined Cardiff University in 1995. His research addresses the problems encountered in the field of non-linear RF and microwave circuit design. These activities have, to date, focused mainly on the design, modelling and characterisation of non-linear RF and microwave transistors and power amplifier circuits.

Linear and efficient power amplifiers are a critical component in present and future communication, satellite and wireless systems. The group has unique facilities for performing, high frequency (up to 40 GHz) and high power level (up to 100 Watts) time domain based I-V waveform measurements, non-linear vector network analyser concept, on transistors and circuits into user defined source and load impedances, active harmonic load-pull concept. This experimental work is supported by a number of CAD based software tools.

This research has been performed with the support and collaboration of a number of leading international companies, for example, Nokia, Filtronics, Agilent, Motorola, Celeritek and Marconi.

After completing his secondary education in Castletown, Isle of Man in 1976, Paul Tasker went to study Physics and Electronics at the University of Leeds, obtaining a Combined Studies BSc Degree with First Class Honours in 1979. He remained at Leeds University, obtaining a PhD from the Department of Electrical and Electronic Engineering in December 1983. Prior to his present appointment he was a Senior Research Associate at Cornell University, Ithaca, NY, USA and then a project manager at the Fraunhofer Institute for Applied Solid State Physics (IAF), Freiburg, Germany. At Cornell University he managed a world-leading research programme in the area of fabrication, design, characterisation (DC and microwave) and modelling (analytical and numerical) of compound semiconductor devices. Key outcomes of this work were (i) the demonstration of low noise operation in MODFETs at cryogenic temperatures; (ii) the development of very high performance (fT > 150 GHz) pseudomorphic transistors; and (iii) the demonstration of a laser diode that was “on-wafer” testable with microwave probes. At the IAF he established and managed research programs responsible for (i) the development, characterisation and optimisation of short gate length compound semiconductor devices and (ii) the development, design and characterisation of high power microwave MMICs and low noise millimeter-wave MMICs. An outcome of this work was the development of a comprehensive millimeter-wave characterisation facility, the realisation of state-of-the-art millimeter-wave MMICs having 20 dB Gain @ 115 GHz and laser diodes with a 40 GHz 3dB modulation bandwidth.

Paul Tasker has expertise in the area of fabrication, design and characterisation of high frequency (microwave and millimeter wave) compound semiconductor electronic and optoelectronic devices and circuits. He has developed a number of microwave and millimeter wave, s-parameters, noise parameters and non-linear parameter, measurement systems along with the associated analysis and extraction techniques for characterising transistors and developing CAD models. As a consequence of this work he has contributed to over 100 technical papers and publications including two book chapters.

He has lectured at a number of short courses and workshops both in Europe and the USA on transistor design, optimisation and characterisation. He has acted as a consultant to various major USA industries, GE, MSC, AT&T Bell Laboratories, Alpha, Martin Marietta, Siemens, NESI, EG&G Princeton Applied Research and Hewlett Packard.

2024

Morales-Fernandez, A., Marante-Boado, M., Toimil-Cornado, P., Fernandez-Barciela, M., Martin-Rodriguez, F. and Tasker, P. J. 2024. Single-ended and balanced frequency doublers 2.45 to 4.9 GHz using GaN FETs. Presented at: 54th European Microwave Conference (EuMC), Paris, France, 24-26 September 20242024 54th European Microwave Conference (EuMC). IEEE pp. 1042-1045., (10.23919/eumc61614.2024.10732057)
Tian, M., Bell, J. J., Quaglia, R., Azad, E. M. and Tasker, P. J. 2024. Artificial neural network nonlinear transistor behavioral models: Structure and parameter determination process based on the Cardiff Model. IEEE Transactions on Microwave Theory and Techniques (10.1109/TMTT.2024.3434959)
van den Heuvel, I., Azad, E. M., Omisakin-Edwards, M., Cripps, S. C., Tasker, P. J. and Quaglia, R. 2024. A baseband impedance cancellation technique for wideband multi-transistor amplifiers. IEEE Microwave and Wireless Technology Letters 34(6), pp. 777-780. (10.1109/LMWT.2024.3390594)
Tian, M., Urvoy, J., Powell, J., Bell, J. J., Cripps, S. C., Tasker, P. and Quaglia, R. 2024. Application of the Cardiff Model for Orthogonal LMBA response prediction. Presented at: 2024 IEEE Topical Conference on RF/Microwave Power Amplifiers for Radio and Wireless Applications (PAWR), 21-24 January 2024Proceedings Topical Conference on RF/Microwave Power Amplifiers for Radio and Wireless Applications (PAWR) 2024. IEEE pp. 17-20., (10.1109/PAWR59907.2024.10438664)
Tian, M., Bell, J. J., Quaglia, R. and Tasker, P. J. 2024. An extraction method based on artificial neural network techniques for novel Cardiff model with reasonable extrapolation behavior. IEEE Microwave and Wireless Components Letters 34(1), pp. 5-8. (10.1109/LMWT.2023.3329979)
Baddeley, A., Quaglia, R. and Tasker, P. J. 2024. Calibration error reduction in millimeter-wave load-pull systems measuring highly-reflective loads. IEEE Transactions on Microwave Theory and Techniques

2023

Van Den Heuvel, I., Quaglia, R., Cripps, S. C. and Tasker, P. J. 2023. An envelope model for efficient prediction of the impact of wideband signals on power amplifier performance. Presented at: 2023 International Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits (INMMIC), 08-11 November 20232023 International Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits (INMMIC). IEEE, (10.1109/INMMIC57329.2023.10321784)
Baddeley, A., Woodington, S., Gecan, D., Sheikh, A., Lunn, J., Tasker, P. and Quaglia, R. 2023. Millimeter-wave on-wafer large signal characterization system for harmonic source/load pull and waveform measurements. Presented at: 2023 IEEE/MTT-S International Microwave Symposium - IMS 2023, San Diego, USA, 11-16 June 2023Proceedings of the 2023 IEEE/MTT-S International Microwave Symposium (IMS). IEEE pp. 1101-1104., (10.1109/IMS37964.2023.10187929)
Ghozati, S. U., Quaglia, R., Azad, E., Powell, J., Tasker, P. and Cripps, S. 2023. Load pull-driven behavioral modelling of microwave switches for the design of tunable reflective terminations. Presented at: EuMW 2024: European Microwave Week 2023, 19 - 21 September 2023.
Tian, M., Bell, J., Azad, E., Quaglia, R. and Tasker, P. 2023. A novel Cardiff model coefficients extraction process based on artificial neural network. Presented at: 2023 IEEE Topical Conference on RF/Microwave Power Amplifiers for Radio and Wireless ApplicationsED, MAY BE LINKED, Las Vegas, NV, USA, 22-25 January 20232023 IEEE Topical Conference on RF/Microwave Power Amplifiers for Radio and Wireless Applications. IEEE, (10.1109/PAWR56957.2023.10046221)

2022

Moure, M. R., Casbon, M., Ladero, N., Fernandez‐Barciela, M. and Tasker, P. J. 2022. Evaluation of admittance domain behavioural model complexity requirements for Power Amplifier design. IET Microwaves, Antennas and Propagation 16(12), pp. 780-788. (10.1049/mia2.12285)
Azad, E. M., Quaglia, R., Chadhary, K., Bell, J. J. and Tasker, P. J. 2022. Cardiff model utilization for predicting the response of multiple-input power amplifiers. Presented at: Mediterrannean Microwave Symposium (MMS), Pizzo Calabro, Italy, 9-13 May 2022Proceedings of Microwave Mediterranean Symposium (MMS). IEEE, (10.1109/MMS55062.2022.9825516)
Azad, E. M., Bell, J. J., Quaglia, R., Moreno Rubio, J. J. and Tasker, P. J. 2022. New formulation of Cardiff behavioral model including DC bias voltage dependence. IEEE Microwave and Wireless Components Letters 32(6), pp. 607-610. (10.1109/LMWC.2022.3140653)
Davies-Smith, C., Quaglia, R., Woodington, S., Sheikh, A. and Tasker, P. 2022. An enhanced active load-pull algorithm for faster convergence. Presented at: European Microwave Week 2021, London, UK, 2-7 April 2022European Microwave Week 2021 "United in Microwaves" Conference Proceedings. IEEE pp. 354., (10.23919/EuMC50147.2022.9784250)
Azad, E. M., Quaglia, R., Bell, J. J., Chaudhry, K., Nghiem, A., Sulaksono, K. and Tasker, P. J. 2022. Load-pull data analysis of a GaN on SiC HEMT targeting multi bias Doherty design. Presented at: International Workshop on Integrated Nonlinear Microwave and Millimeterwave Circuits, INMMIC, Cardiff, UK, 7-8 April 2022Proceedings of the 2022 International Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits. IEEE, (10.1109/INMMiC54248.2022.9762106)
Morales-Fernandez, A., Fernandez-Barciela, M., Isasi-Vicente, F., Martin-Rodriguez, F. and Tasker, P. J. 2022. Dual-band class J power amplifier at 2.45 and 5.8 GHz for UAVs communications. IEEE Access 10, pp. 48673-48680. (10.1109/ACCESS.2022.3172475)
Baddeley, A., Azad, E., Quaglia, R., Bell, J. and Tasker, P. 2022. Gate bias voltage dependence of Cardiff admittance model in Ka-band GaAs pHEMTs. Presented at: IEEE Topical Conference on RF/Microwave Power Amplifiers for Radio and Wireless Applications (PAWR), Las Vegas, NV, USA, 16-19 January 20222022 IEEE Topical Conference on RF/Microwave Power Amplifiers for Radio and Wireless Applications (PAWR). IEEE pp. 8-10., (10.1109/PAWR53092.2022.9719858)
Yang, F. et al. 2022. Study of drain injected breakdown mechanisms in AlGaN/GaN-on-SiC HEMTs. IEEE Transactions on Electron Devices 69(2), pp. 525-530. (10.1109/TED.2021.3138841)
Azad, E. M., Quaglia, R., Bell, J. J., Chaudhry, K. and Tasker, P. J. 2022. DC-dependent Cardiff model from modulated supply and load-pull data. Presented at: 2022 Asia-Pacific Microwave Conference (APMC), Yokohama, Japan, 29 November 2022 - 02 December 2022Proceedings of 2022 Asia-Pacific Microwave Conference (APMC). IEEE pp. 181-183., (10.23919/APMC55665.2022.9999796)

2021

Rubio, J. J. M., Quaglia, R., Piacibello, A., Camarchia, V., Tasker, P. J. and Cripps, S. 2021. 3-20 GHz GaN MMIC Power Amplifier Design Through a COUT Compensation Strategy. IEEE Microwave and Wireless Components Letters 31(5), pp. 469-472. (10.1109/LMWC.2021.3066282)
Tasker, P. J. 2021. Robust extraction of Cardiff model parameters from appropriately tailored measured load-pull data. Presented at: 2020 IEEE BiCMOS and Compound Semiconductor Integrated Circuits and Technology Symposium (BCICTS), Monterey, CA, USA, 16-19 November 20202020 IEEE BiCMOS and Compound Semiconductor Integrated Circuits and Technology Symposium (BCICTS). IEEE pp. 1-5., (10.1109/BCICTS48439.2020.9392942)
Alimohammadi, Y. et al. 2021. Incorporating gate-lag effects into the Cardiff Behavioural Model. Presented at: 50th European Microwave Conference (EuMC 2020), Utrecht, Netherlands, 12-14 January 20212020 50th European Microwave Conference (EuMC). IEEE pp. 684-687., (10.23919/EuMC48046.2021.9338185)

2020

Azad, E. M., Bell, J. J., Quaglia, R., Moreno Rubio, J. J. and Tasker, P. J. 2020. Gate bias incorporation into Cardiff behavioural modelling formulation. Presented at: IEEE/MTT-S International Microwave Symposium (IMS 2020), Los Angeles, CA, USA, 4-6 August 20202020 IEEE/MTT-S International Microwave Symposium (IMS). IEEE pp. 420-423., (10.1109/IMS30576.2020.9223817)
Alimohammadi, Y. et al. 2020. Pulse profiling active load pull measurements. Presented at: IEEE/MTT-S International Microwave Symposium (IMS 2020), Los Angeles, CA, USA, 4-6 August 20202020 IEEE/MTT-S International Microwave Symposium (IMS). IEEE pp. 759-762., (10.1109/IMS30576.2020.9223989)
Moreno Rubio, J., Quaglia, R., Baddeley, A., Tasker, P. and Cripps, S. 2020. Design of a broadband power amplifier based on power and efficiency contours estimation. IEEE Microwave and Wireless Components Letters 30(8), pp. 772 -774. (10.1109/LMWC.2020.3005833)
Chen, P., Quaglia, R., Lees, J., Merrick, B. M., Alt, A. and Tasker, P. J. 2020. Look-up table method for optimising coupling ratio in broadband sequential power amplifiers. IET Microwaves Antennas and Propagation 14(13), pp. 1626-1634. (10.1049/iet-map.2019.1102)
Chen, P., Quaglia, R., Lees, J., Merrick, B. M., Alt, A. and Tasker, P. 2020. Efficiency enhancement of a broadband sequential power amplifier using envelope tracking. Presented at: 2020 International Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits (INMMiC), Cardiff, Wales, 16-17 July 20202020 International Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits (INMMiC). IEEE pp. 1-3., (10.1109/INMMiC46721.2020.9160332)
Chen, P. et al. 2020. Optimising linearity of envelope tracking power amplifier using baseband linearisation approach. Presented at: 2020 International Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits (INMMiC), Cardiff, Wales, 16-17 July 20202020 International Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits (INMMiC). IEEE pp. 1-3., (10.1109/INMMiC46721.2020.9160347)
Alt, A., Villarruel-Parra, A., Chen, P., Alsahali, S., Forsyth, A., Tasker, P. J. and Lees, J. 2020. Characterising the baseband impedance of supply modulators using simple modulated signals. Presented at: 2020 International Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits (INMMiC), Cardiff, Wales, 16-17 July 20202020 International Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits (INMMiC). IEEE pp. 1-3., (10.1109/INMMiC46721.2020.9160186)
Chen, P., Alsahali, S., Alt, A., Wang, G., Casbon, M. A., Lees, J. and Tasker, P. J. 2020. Flexible bandwidth reduction technique for envelope tracking using low-pass finite impulse response filters. Electronics Letters 56(12), pp. 586-589. (10.1049/el.2020.0194)
Alsahali, S. et al. 2020. Modulated rapid load pull system for the emulation of envelope tracking power amplifiers. Electronics Letters 56(7), pp. 325-328. (10.1049/el.2019.3896)

2019

Chaudhary, M. A., Yusoff, Z., Lees, J., Benedikt, J. and Tasker, P. 2019. Auxiliary envelope tracking focused investigations of a 10W GaN HEMTs device. Presented at: 3rd International Conference on Circuits, Systems and Devices (ICCSD), Chengdu, China, 23-25 Aug 2017Proceedings of 3rd International Conference on Circuits, Systems and Devices (ICCSD). IEEE pp. 92., (10.1109/ICCSD.2019.8843202)
Mokhti, Z. A., Lees, J., Cassan, C., Alt, A. and Tasker, P. J. 2019. The nonlinear drain-source capacitance effect on continuous-mode class-B/J power amplifiers. IEEE Transactions on Microwave Theory and Techniques 67(7), pp. 2741-2747. (10.1109/TMTT.2019.2918309)
Alt, A. et al. 2019. Analysis of gain variation with changing supply voltages in GaN HEMTs for envelope tracking power amplifiers. IEEE Transactions on Microwave Theory and Techniques 67(7), pp. 2495-2504. (10.1109/TMTT.2019.2916404)
Alsahali, S. et al. 2019. A novel modulated rapid load pull system with digital pre-distortion capabilities. Presented at: 2019 93rd ARFTG Microwave Measurement Conference (ARFTG), Boston, MA, USA, 7 June 2019. , (10.1109/ARFTG.2019.8739220)
Al-Rawachy, A., Husseini, T., Benedikt, J., Tasker, P. and Bell, J. 2019. Cardiff behavioural model analysis using a two-tone stimulus. Presented at: 2019 IEEE Topical Conference on RF/Microwave Power Amplifiers for Radio and Wireless Applications (PAWR), Orlando, FL, USA, 20-23 January 20192019 IEEE Topical Conference on RF/Microwave Power Amplifiers for Radio and Wireless Applications (PAWR). IEEE pp. 5-8., (10.1109/PAWR.2019.8708726)
Syed Anera, S. M. H. et al. 2019. High-efficiency broadband PA design based on continuous Class-F mode with compression. Presented at: 2019 IEEE MTT-S International Microwave Symposium, IMS 2019, Boston, USA, 2 -7 June 2019MTT-S International Microwave Symposium (IMS). IEEE pp. 698-701., (10.1109/MWSYM.2019.8700767)
Al-Rawachy, A., Husseini, T., Benedikt, J., Bell, J. and Tasker, P. 2019. Behavioural model extraction using novel multitone active load-pull. Presented at: 2019 IEEE MTT-S International Microwave Symposium, IMS 2019, Boston, USA, 2 -7 June 2019MTT-S International Microwave Symposium (IMS). IEEE pp. 196-199., (10.1109/MWSYM.2019.8700779)
Chandrasekar, H. et al. 2019. Quantifying temperature-dependent substrate loss in GaN-on-Si RF technology. IEEE Transactions on Electron Devices 66(4), pp. 1681-1687. (10.1109/TED.2019.2896156)
Alt, A., Chen, P., Alsahali, S., Wang, G., Quaglia, R., Tasker, P. and Lees, J. 2019. Impact of the input impedance on the linearity of supply modulated GaN HEMT power amplifiers. Presented at: European Microwave Week 2019 (EuMW2019), 29 September - 03 October 2019.
Alt, A., Quaglia, R., Chen, P., Alsahali, S., Tasker, P. and Lees, J. 2019. Class B* - A new high efficiency RF DC/DC converter concept using second harmonic generation/injection. Presented at: WPTC 2018: IEEE MTT-S Wireless Power Transfer Conference, Montreal, Quebec, 3-7 June 20182018 IEEE Wireless Power Transfer Conference (WPTC). IEEE, (10.1109/WPT.2018.8639317)
Husseini, T., Al-Rawachy, A., Benedikt, J., Bell, J. and Tasker, P. 2019. Global behavioural model generation using coefficients interpolation. Presented at: 2019 IEEE MTT-S International Microwave Symposium, IMS 2019, Boston, USA, 2 -7 June 2019. pp. -.

2018

Hirshy, H. et al. 2018. Evaluation of pulsed I-V analysis as validation tool of nonlinear RF models of GaN-based HFETs. IEEE Transactions on Electron Devices 65(12), pp. 5307-5313. (10.1109/TED.2018.2872513)
Alt, A., Quaglia, R., Chen, P., Alsahali, S., Tasker, P. J. and Lees, J. 2018. Analysis of highly efficient self-synchronous class-F microwave rectifiers using waveform engineering. Presented at: 48th European Microwave Conference (EuMC), Madrid, Spain, 23-27 Sep 2018Proceedings of the 48th European Microwave Conference. Piscataway, NJ: IEEE pp. 773-776., (10.23919/EuMC.2018.8541564)
Chandrasekar, H. et al. 2018. Buffer-induced current collapse in GaN HEMTs on highly resistive Si substrates. IEEE Electron Device Letters 39(10), pp. 1556-1559. (10.1109/LED.2018.2864562)
Singh, M. et al. 2018. Pulsed large signal RF performance of field-plated Ga2O3 MOSFETs. IEEE Electron Device Letters 39(10), pp. 1572-1575. (10.1109/LED.2018.2865832)
Husseini, T., Al-Rawachy, A., Benedikt, J., Bel, J. and Tasker, P. 2018. Automating the accurate extraction and verification of the Cardiff Model via the direct measurement of load-pull power contours. Presented at: 2018 IEEE/MTT-S International Microwave Symposium - IMS, Philadelphia, PA, USA, 10-15 June 20182018 IEEE/MTT-S International Microwave Symposium - IMS. IEEE pp. 544., (10.1109/MWSYM.2018.8439581)
Alt, A., Chen, P., Alsahali, S., Quaglia, R., Tasker, P. and Lees, J. 2018. Comparing FET technologies in terms of their suitability for broadband envelope tracking power amplifiers. Presented at: InMMIC, Brive La Gaillarde, 5-6 July 2018. pp. -.
Chen, P., Alsahali, S., Alt, A., Lees, J. and Tasker, P. J. 2018. Behavioral modeling of GaN power amplifiers using long short-term memory networks. Presented at: International Workshop on Integrated Nonlinear Microwave and Millimetre-wave Circuits (INMMIC), Brive La Gaillarde, France, 5-6 Jul 2018International Workshop on Integrated Nonlinear Microwave and Millimetre-wave Circuits (INMMIC). IEEE, (10.1109/INMMIC.2018.8429984)
Husseini, T., Al-Rawachy, A., Anera, S. S., Bell, J., Tasker, P. and Benedikt, J. 2018. On the effective modeling of the test-set non-linearity. Presented at: 2018 91st ARFTG Microwave Measurement Conference (ARFTG), Philadelphia, PA, USA, 15 June 20182018 91st ARFTG Microwave Measurement Conference (ARFTG). IEEE, (10.1109/ARFTG.2018.8423832)
Chaudhary, M. A., Memon, Z. A., Yusoff, Z., Lees, J., Benedikt, J. and Tasker, P. 2018. Optimization of out-of-band impedance environment for linearity improvements of microwave power transistors. Presented at: 2018 5th International Conference on Electrical and Electronic Engineering (ICEEE), Istanbul, Turkey, 3-5 May 20182018 5th International Conference on Electrical and Electronic Engineering (ICEEE). IEEE pp. 219-223., (10.1109/ICEEE2.2018.8391334)
Roff, C. et al. 2018. Utilization of waveform measurements for degradation analysis of AlGaN/GaN HFETs. Presented at: ARFTG 70th Microwave Measurement Symposium, Tempe, AZ, USA, 27-30 November 20072007 70th ARFTG Microwave Measurement Conference (ARFTG). IEEE, (10.1109/ARFTG.2007.8376173)
Moure, M. R., Casbon, M., Ladero, N., Fernandez-Barciela, M. and Tasker, P. J. 2018. A systematic investigation of admittance domain behavioral model complexity requirements. Presented at: 2018 IEEE MTT-S Latin America Microwave Conference (LAMC 2018), Arequipa, Peru, 12-14 December 20182018 IEEE MTT-S Latin America Microwave Conference (LAMC 2018). Piscataway, NJ: IEEE, (10.1109/LAMC.2018.8699054)
Quaglia, R., Powell, J., Shepphard, D., Tasker, P. and Cripps, S. 2018. Analysis and characterization of a load modulated balanced amplifier for base-station applications. Presented at: 2018 11th German Microwave Conference (GeMiC), Freiburg, Germany, 12-14 March 20182018 11th German Microwave Conference (GeMiC). IEEE pp. 1-4., (10.23919/GEMIC.2018.8335013)
Chaudhary, M. A., Memon, Z. A., Lees, J., Benedikt, J. and Tasker, P. 2018. Multitone measurement system for linearity investigations of microwave devices. Presented at: International Multi-Topic Conference (Inmic), Lahore, Pakistan, 24-26 Nov 2017International Multi-Topic Conference (Inmic). IEEE, (10.1109/INMIC.2017.8289455)
Bogusz, A., Costello, Z., Quaglia, R., Bell, J., Lees, J., Tasker, P. and Cripps, S. 2018. Power and efficiency continuous modes in saturated GaN HEMT devices. Presented at: Inmmic 2018, Brive-La-Gaillarde, France, 5- 6 July 2018.

2017

Rocio Moure, M., Casbon, M., Fernandez-Barciela, M. and Tasker, P. J. 2017. Direct extraction of an admittance domain behavioral model from large-signal load-pull measurements. Presented at: 2017 IEEE MTT-S International Microwave Symposium (IMS), Honololu, HI, USA, 4-9 June 20172017 IEEE MTT-S International Microwave Symposium (IMS). IEEE pp. 1053-1056., (10.1109/MWSYM.2017.8058775)
Brazzini, T., Casbon, M. A., Uren, M. J., Tasker, P. J., Jung, H., Blanck, H. and Kuball, M. 2017. Hot-electron electroluminescence under RF operation in GaN-HEMTs: A comparison among operational classes. IEEE Transactions on Electron Devices 64(5), pp. 2155-2160. (10.1109/TED.2017.2686782)
Fernandez-Barciela, M., Rocio Moure, M., Pelaez-Perez, A., Casbon, M. and Tasker, P. J. 2017. Exploiting behavioral modelling formulations for nonlinear analytical circuit design and improved frequency scalability Bandwidth extension through the admittance domain (Invited Paper). Presented at: 2017 IEEE 18th Wireless and Microwave Technology Conference (WAMICON), Cocoa Beach, FL, USA, 24-25 April 20172017 IEEE 18th Wireless and Microwave Technology Conference (WAMICON). IEEE pp. 1-496., (10.1109/WAMICON.2017.7930279)
Dong, S., Lees, J. and Tasker, P. J. 2017. A de-embedding network at higher frequency and its error analysis. Presented at: IEEE International Conference on Electronic Information and Communication Technology (ICEICT), Harbin, China, 20-22 Aug 2016IEEE International Conference on Electronic Information and Communication Technology (ICEICT). IEEE pp. 512-514., (10.1109/ICEICT.2016.7879754)
Chaudhary, M. A., Memon, Z. A., Yusoff, Z., Lees, J., Benedikt, J. and Tasker, P. J. 2017. Characterization of baseband electrical memory in microwave devices using multi-tone measurement system. Presented at: 2016 16th Mediterranean Microwave Symposium (MMS), 14-16 November 201616th Mediterranean Microwave Symposium (MMS), 2016. IEEE pp. 1., (10.1109/MMS.2016.7803811)
Pooth, A. et al. 2017. Morphological and electrical comparison of Ti and Ta based ohmic contacts for AlGaN/GaN-on-SiC HFETs. Microelectronics Reliability 68, pp. 2-4. (10.1016/j.microrel.2016.11.002)

2016

Moure, M. R., Fernandez-Barciela, M., Casbon, M. A. and Tasker, P. J. 2016. Broadband non-linear FET behavioral model defined in the admittance domain. Presented at: 11th European Microwave Integrated Circuits Conference (EuMIC), London, UK, 3-4 October 20162016 11th European Microwave Integrated Circuits Conference (EuMIC 2016). Institute of Electrical and Electronics Engineers (IEEE) pp. 281-284., (10.1109/EuMIC.2016.7777545)
Dong, S., Tasker, P. J., Wang, G. and Lees, J. 2016. A practicable de-embedding network at higher frequency of a packaged GaN device. Presented at: 2016 IEEE MTT-S International Wireless Symposium (IWS), 14-16 March 2016IEEE MTT-S International Wireless Symposium (IWS), 2016. IEEE pp. 1., (10.1109/IEEE-IWS.2016.7585473)
Casbon, M., Brazzini, T., Tasker, P. J., Uren, M. and Kuball, M. 2016. Simultaneous measurement of optical and RF behavior under CW and pulsed fully active harmonic load-pull. Presented at: ARFTG 87th Conference: Measurements for Emerging Communications Technologies, San Francisco, CA, USA, 27 May 2016.
Loescher, D., Tasker, P. and Cripps, S. 2016. Using waveform engineering to understand the impact of harmonic terminations during 5:1 VSWR stress tests. Presented at: Power Amplifiers for Wireless and Radio Applications (PAWR), 2016 IEEE Topical Conference on, Austin, TX, USA, 24-27 Jan. 20162016 IEEE Topical Conference on Power Amplifiers for Wireless and Radio Applications (PAWR). IEEE pp. 49-52., (10.1109/PAWR.2016.7440161)
Chaudhary, M. A., Lees, J., Benedikt, J. and Tasker, P. J. 2016. Modulated waveform measurement and engineering system. Presented at: 2015 2nd International Conference on Electronics and Communication Systems (ICECS), Cairo, Egypt, 6-9 December 20152015 IEEE International Conference on Electronics, Circuits, and Systems (ICECS 2015). Institute of Electrical and Electronics Engineers (IEEE) pp. 252-255., (10.1109/ICECS.2015.7440296)
Elgaid, K., Houston, P. and Tasker, P. 2016. EPSRC projects in microwave, millimetre-wave and THz research, integration of RF circuits with high speed GaN switching on silicon substrates. Presented at: European Microwave Conference, London, 3-7 Oct 2016.

2015

Brazzini, T. et al. 2015. Study of hot electrons in AlGaN/GaN HEMTs under RF Class B and Class J operation using electroluminescence. Microelectronics Reliability 55(12), pp. 2493-2498. (10.1016/j.microrel.2015.09.023)
Mokhti, Z. A., Lees, J., Tasker, P. J. and Cassan, C. 2015. Investigating the linearity versus efficiency trade-off of different power amplifier modes in an envelope tracking architecture. 2015 10th European microwave integrated circuits conference (eumic), pp. 357-360. (10.1109/EuMIC.2015.7345143)
Hashmi, M. S., Ghannouchi, F. M. and Tasker, P. J. 2015. High frequency waveform engineering and its applications: tutorial 54. IEEE Instrumentation & Measurement Magazine 18(3), pp. 44-50. (10.1109/MIM.2015.7108400)
Brazzini, T. et al. 2015. Electroluminescence of hot electrons in AlGaN/GaN high-electron-mobility transistors under radio frequency operation. Applied Physics Letters 106(21), article number: 213502. (10.1063/1.4921848)
Rodriguez-Testera, A., Pelaez-Perez, A., Fernandez-Barciela, M. and Tasker, P. J. 2015. Design of injection-locked oscillator circuits using an HBT X-parameters (TM)-based model. IET Microwaves, Antennas and Propagation 9(4), pp. 380-388. (10.1049/iet-map.2014.0118)
Casbon, M. A. and Tasker, P. J. 2015. Comparison of sampler and VNA based Large Signal Measurement Systems (LSNA) under CW and pulsed operation. Presented at: 2015 85th Microwave Measurement Conference (ARFTG), 22-26 May 2015Microwave Measurement Conference (ARFTG), 2015 85th. IEEE pp. 1., (10.1109/ARFTG.2015.7162890)
Root, D. E., Biernacki, R. M., Marcu, M., Koh, M. and Tasker, P. J. 2015. Frequency-scalable nonlinear behavioral transistor model from single frequency X-parameters based on time-reversal transformation properties (INVITED). Presented at: 2015 86th ARFTG Microwave Measurement Conference, 3-4 December 2015Microwave Measurement Conference, 2015 86th ARFTG. IEEE pp. 1., (10.1109/ARFTG.2015.7381463)

2014

Canning, T. A. J., Tasker, P. J. and Cripps, S. C. 2014. Continuous mode power amplifier design using harmonic clipping contours: theory and practice. IEEE Transactions on Microwave Theory and Techniques 62(1), pp. 100-110. (10.1109/TMTT.2013.2292675)
Koh, M., Bell, J. J., Williams, D., Patterson, A., Lees, J., Root, D. E. and Tasker, P. J. 2014. Frequency scalable large signal transistor behavioral model based on admittance domain formulation. Presented at: International Microwave Symposium, Tampa, Florida, 1-6 June 20142014 IEEE MTT-S International Microwave Symposium (IMS). Picastaway, NJ: IEEE pp. 1-3., (10.1109/MWSYM.2014.6848287)
A Mokhti, Z. B., Tasker, P. J. and Lees, J. 2014. Correlation analysis between a VNA-based passive load pull system and an oscilloscope-based active load pull system: a case study. Presented at: 83rd ARFTG Microwave Measurement Conference 2014, Tampa, USA, 6 June 201483rd ARFTG Microwave Measurement Conference (ARFTG), 2014. pp. 1-4., (10.1109/ARFTG.2014.6899535)
Ogboi, F. L. et al. 2014. Investigation of various envelope complexity linearity under modulated stimulus using a new envelope formulation approach. Presented at: 83rd ARFTG Microwave Measurement Conference 2014, Tampa, USA, 1 - 6 June 2014Compound Semiconductor Integrated Circuit Symposium (CSICs), 2014 IEEE. IEEE pp. 1-4., (10.1109/CSICS.2014.6978563)
Fernandez-Barciela, M., Pelaez-Perez, A. M., Woodington, S., Alonso, J. I. and Tasker, P. J. 2014. Stretching the design: extending analytical circuit design from the linear to the nonlinear domain. IEEE Microwave Magazine 15(6), pp. 106-120. (10.1109/MMM.2014.2332851)
Yang, F., Lees, J., Choi, H., Yu, H. and Tasker, P. J. 2014. Continuous class BJ power amplifier with DGS output matching. Presented at: 83rd ARFTG Microwave Measurement Conference 2014, Tampa, USA, 6 June 2014Microwave Symposium (IMS), 2014 IEEE MTT-S International. IEEE pp. 1-4., (10.1109/MWSYM.2014.6848562)
A Mokhti, Z. B., Tasker, P. J. and Lees, J. 2014. Using waveform engineering to optimize class-F power amplifier performance in an envelope tracking architecture. Presented at: 44th European Microwave Conference (EuMC) 2014, Rome, Italy, 6-9 October 201444th European Microwave Conference (EuMC 2014). IEEE pp. 1301-1304., (10.1109/EuMC.2014.6986682)
Aldoumani, A., Williams, T., Lees, J. and Tasker, P. J. 2014. Enhanced vector calibration of load-pull measurement systems. Presented at: 83rd ARFTG Microwave Measurement Conference 2014, Tampa, FL, USA, 6 June 2014ARFTG Microwave Measurement Conference (ARFTG), 2014 83rd. IEEE pp. 1-4., (10.1109/ARFTG.2014.6899508)
Ogboi, F. L. et al. 2014. High bandwidth investigations of a baseband linearization approach formulated in the envelope domain under modulated stimulus. Presented at: European Microwave Conference (EuMC) 2014, Rome, Italy, 6-9 October 2014European Microwave Conference (EuMC), Vol. 44. IEEE pp. 1305-1308., (10.1109/EuMC.2014.6986683)
Mokhti, Z. A., Tasker, P. J. and Lees, J. 2014. Using waveform engineering to optimize Class-F power amplifier performance in an envelope tracking architecture. Presented at: 9th European Microwave Integrated Circuit Conference (EuMIC), Rome, Italy, 6-7 Octpber 2014European Microwave Integrated Circuit Conference (EuMIC), 2014 9th. IEEE pp. 357-360., (10.1109/EuMIC.2014.6997866)
Mokhti, Z. A., Tasker, P. J. and Lees, J. 2014. Analyzing the improvement in efficiency through the integration of class-F power amplifiers compared to class-AB in an envelope tracking architecture. Presented at: 26th International Teletraffic Congress (ITC), Karlskrona, Sweden, 9-11 September 2014Teletraffic Congress (ITC), 2014 26th International. pp. 1-4., (10.1109/ITC.2014.6932967)
Ogboi, F. L. et al. 2014. Sensitivity of AM/AM linearizer to AM/PM distortion in devices. Presented at: 83rd ARFTG Microwave Measurement Conference 2014, Tampa, FL, USA, 6 June 2014ARFTG Microwave Measurement Conference (ARFTG), 2014 83rd. IEEE pp. 1-4., (10.1109/ARFTG.2014.6899507)

2013

Yusoff, Z., Lees, J., Chaudhary, M. A., Carrubba, V., Choi, H., Tasker, P. J. and Cripps, S. C. 2013. Simple and low-cost tracking generator design in envelope tracking radio frequency power amplifier system for WCDMA applications. IET Microwaves, Antennas & Propagation 7(10), pp. 802-808. (10.1049/iet-map.2013.0091)
Koh, M., Bell, J. J., Williams, D., Patterson, A., Wohlmuth, W., Lees, J. and Tasker, P. J. 2013. X-band MMIC scalable large signal model based on unit cell behavioral data model and passive embedding network. Presented at: International Microwave Symposium, Seattle, WA, 2-7 June 20132013 IEEE MTT-S International Microwave Symposium Digest (IMS). Picastaway, NJ: IEEE pp. 1-4., (10.1109/MWSYM.2013.6697424)
Aldoumani, A., Tasker, P. J., Saini, R. S., Bell, J. J., Williams, T. and Lees, J. 2013. Operation and calibration of VNA-based large signal RF I-V waveform measurements system without using a harmonic phase reference standard. Presented at: ARFTG Microwave Measurement Conference (ARFTG), Seattle, WA, 7-7 June 20132013 81st ARFTG Microwave Measurement Conference (ARFTG). Picastaway, NJ: IEEE pp. 1-4., (10.1109/ARFTG.2013.6579055)
Casbon, M. A. and Tasker, P. J. 2013. Filter-less diplexer enables active harmonic load-pull at ka band. Presented at: 81st ARFTG Microwave Measurement Conference, Seattle, Washington, USA, 7 June 2013Microwave Measurement Conference (ARFTG), 2013 81st ARFTG. Picastaway: IEEE pp. 1-4., (10.1109/ARFTG.2013.6579028)
Ogboi, F. L. et al. 2013. A LSNA configured to perform baseband engineering for device linearity investigations under modulated excitations. Presented at: 43rd European Microwave Conference, Nuremberg, Germany, 7-10 October 2013Proceedings of the 43rd European Microwave Conference. pp. 684-687.
Canning, T. A. J., Tasker, P. J. and Cripps, S. C. 2013. Waveform evidence of gate harmonic short circuit benefits for high efficiency x-band power amplifiers. IEEE Microwave and Wireless Components Letters 23(8), pp. 439-441. (10.1109/LMWC.2013.2272317)
Canning, T. A. J., Tasker, P. J. and Cripps, S. C. 2013. Load Pull verification of a novel Class B/J design tool: Second harmonic clipping contours. Presented at: 81 st ARFTG Microwave Measurement Conference, Seattle, WA, USA, 7 June 2013Microwave Measurement Conference (ARFTG), 2013 81st ARFTG. IEEE pp. 1-3., (10.1109/ARFTG.2013.6579040)
Haynes, M., Tasker, P. J. and Cripps, S. C. 2013. High efficiency PA design strategy at X-Band. Presented at: 2013 IEEE Compound Semiconductor Integrated Circuit Symposium (CSICS), Monterey, CA, USA, 13-16 October 2013Compound Semiconductor Integrated Circuit Symposium (CSICS), 2013 IEEE. IEEE pp. 1-4., (10.1109/CSICS.2013.6659232)
Chaudhary, M. A., Memon, Z. A., Lees, J., Benedikt, J. and Tasker, P. J. 2013. Investigation of baseband electrical memory effects on the dynamic characteristics of power transistors. Presented at: 2013 16th International Multi Topic Conference (INMIC), Lahore, Pakistan, 19-20 December 2013Multi Topic Conference (INMIC), 2013 16th International. IEEE pp. 106-109., (10.1109/INMIC.2013.6731333)
Chaudhary, M. A., Lees, J., Benedikt, J. and Tasker, P. J. 2013. Reduction of baseband electrical memory effects using broadband active baseband load-pull. Presented at: 2013 IEEE International Wireless Symposium (IWS), Beijing, China, 14-18 April 2013Wireless Symposium (IWS), 2013 IEEE International. IEEE pp. 1-4., (10.1109/IEEE-IWS.2013.6616709)
Hone, T. M. et al. 2013. Inverse active load-pull in an inverse Doherty amplifier. Presented at: 2013 IEEE Topical Conference on Power Amplifiers for Wireless and Radio Applications, Santa Clara, CA, USA, 20 Jauary 2013Power Amplifiers for Wireless and Radio Applications (PAWR), 2013 IEEE Topical Conference on. IEEE pp. 4-6., (10.1109/PAWR.2013.6490170)
Casbon, M. A., Tasker, P. J., Wang, W., Lin, C., Wang, W. and Wohlmuth, W. 2013. Advanced RF IV waveform engineering tool for use in device technology optimization: RF pulsed fully active harmonic load pull with synchronized 3eV laser. Presented at: IEEE Compound Semiconductor Integrated Circuit Symposium (CSICS), Monterey, CA, USA, 13-16 October 2013Compound Semiconductor Integrated Circuit Symposium (CSICS), 2013 IEEE. IEEE pp. 1-4., (10.1109/CSICS.2013.6659212)

2012

Hashmi, M. S., Tasker, P. J. and Ghannouchi, F. M. 2012. High speed device characterization enabler: The Envelope Load-Pull system. Presented at: 2012 Asia-Pacific Microwave Conference Proceedings (APMC), New Delhi, India, 4-7 December 2012Microwave Conference Proceedings (APMC), 2012 Asia-Pacific. pp. 839-841., (10.1109/APMC.2012.6421752)
McGenn, W., Uren, M. J., Benedikt, J. and Tasker, P. J. 2012. Development of an RF IV waveform based stress test procedure for use on GaN HFETs. Microelectronics Reliability 52(12), pp. 2880-2883. (10.1016/j.microrel.2012.09.007)
Pelaez-Perez, A. M., Woodington, S. P., Fernandez-Barciela, M., Tasker, P. J. and Alonso, J. I. 2012. Large-signal oscillator design procedure utilizing analytical x-parameters closed-form expressions. IEEE Transactions on Microwave Theory and Techniques 60(10), pp. 3126-3136. (10.1109/TMTT.2012.2209436)
Bensmida, S. et al. 2012. Nonlinear envelope tracking for efficiency optimization of power amplifiers. Presented at: 7th European Microwave Integrated Circuits Conference (EuMIC) 2012, Amsterdam, The Netherlands, 29-30 October 20127th European Microwave Integrated Circuits Conference (EuMIC), 2012. Picastaway, NJ: IEEE pp. 480-483.
Pelaez-Perez, A. M., Woodington, S., Alonso, J. I., Fernandez-Barciela, M. and Tasker, P. J. 2012. X-parameters®-based closed-form expressions for evaluating power-dependent fundamental negative and positive real impedance boundaries in oscillator design. IET Microwaves, Antennas & Propagation 6(8), pp. 835-840. (10.1049/iet-map.2011.0373)
Carrubba, V., Akmal, M., Quay, R., Lees, J., Benedikt, J., Cripps, S. C. and Tasker, P. J. 2012. The Continuous Inverse Class-F Mode With Resistive Second-Harmonic Impedance. IEEE Transactions on Microwave Theory and Techniques 60(6), pp. 1928-1936. (10.1109/TMTT.2012.2189228)
Hone, T. M. et al. 2012. Controlling Active Load-Pull in a Dual-Input Inverse Load Modulated Doherty Architecture. IEEE Transactions on Microwave Theory and Techniques 60(6), pp. 1797-1804. (10.1109/TMTT.2012.2190748)
McGenn, W., Choi, H., Lees, J., Uren, M. J., Benedikt, J. and Tasker, P. J. 2012. Development of a RF waveform stress test procedure for GaN HFETs subjected to infinite VSWR sweeps. Presented at: 2012 IEEE MTT-S International Microwave Symposium Digest, Montreal, Canada, 17-22 June 2012Microwave Symposium Digest (MTT), 2012 IEEE MTT-S International. IEEE pp. 1-3., (10.1109/MWSYM.2012.6259725)
Carrubba, V. et al. 2012. Continuous-ClassF3 power amplifier mode varying simultaneously first 3 harmonic impedances. Presented at: 2012 IEEE MTT-S International Microwave Symposium Digest, Montreal, Canada, 17-22 June 2012Microwave Symposium Digest (MTT), 2012 IEEE MTT-S International. IEEE pp. 1-3., (10.1109/MWSYM.2012.6258343)
Pelaez-Perez, A. M., Fernandez-Barciela, M., Tasker, P. J. and Alonso, J. I. 2012. Application of a NVNA-based system and load-independent X-parameters in analytical circuit design assisted by an experimental search algorithm. Presented at: 2012 IEEE MTT-S International Microwave Symposium Digest, Montreal, Canada, 17-22 June 2012Microwave Symposium Digest (MTT), 2012 IEEE MTT-S International. IEEE pp. 1-3., (10.1109/MWSYM.2012.6258338)
Smith, R. M., Lees, J., Tasker, P. J., Benedikt, J. and Cripps, S. C. 2012. A 40W push-pull power amplifier for high efficiency, decade bandwidth applications at microwave frequencies. Presented at: 2012 IEEE MTT-S International Microwave Symposium Digest (MTT, Montreal, Canada, 17-22 June 2012Microwave Symposium Digest (MTT), 2012 IEEE MTT-S International. IEEE pp. 1-3., (10.1109/MWSYM.2012.6259418)
Smith, R. M., Lees, J., Tasker, P. J., Benedikt, J. and Cripps, S. C. 2012. A Novel Formulation for High Efficiency Modes in Push-Pull Power Amplifiers Using Transmission Line Baluns. IEEE Microwave and Wireless Components Letters 22(5), pp. 257-259. (10.1109/LMWC.2012.2191273)
Tasker, P. J., Carrubba, V., Wright, P., Lees, J., Benedikt, J. and Cripps, S. C. 2012. Wideband PA design: The "continuous" mode of operation. Presented at: Compound Semiconductor Integrated Circuit Symposium (CSICS), La Jolla, CA, USA, 14-17 October 2012Compound Semiconductor Integrated Circuit Symposium (CSICS), 2012 IEEE. IEEE pp. 1-4., (10.1109/CSICS.2012.6340048)
Mimis, K., Morris, K. A., Beach, M. A., McGeehan, J. P., Lees, J., Benedikt, J. and Tasker, P. J. 2012. Overlapped segment piece-wise polynomial pre-distortion for the linearisation of power amplifiers in the presence of high PAPR OFDM signals. Presented at: 2012 IEEE MTT-S International Microwave Symposium Digest, Montreal, Canada, 17-22 June 2012Microwave Symposium Digest (MTT), 2012 IEEE MTT-S International. pp. 1-3., (10.1109/MWSYM.2012.6259543)
Akmal, M., Carrubba, V., Lees, J., Benedikt, J. and Tasker, P. J. 2012. An enhanced modulated waveform measurement system. Australian Journal of Electrical and Electronics Engineering 9(4), pp. 429-438. (10.7158/E11-033.2012.9.4)
Akmal, M. et al. 2012. Characterization of electrical memory effects for complex multi-tone excitations using broadband active baseband load-pull. Presented at: 7th European Microwave Integrated Circuits Conference, Amsterdam, The Netherlands, 29-30 October 20127th European Microwave Integrated Circuits Conference (EuMIC), 2012. Picastaway, NJ: IEEE pp. 885-888.
Pelaez-Perez, A. M., Woodington, S., Fernandez-Barciela, M., Tasker, P. J. and Alonso, J. I. 2012. Application of an NVNA-Based system and load-independent $X$ -parameters in analytical circuit design assisted by an experimental search algorithm. IEEE Transactions on Microwave Theory and Techniques 61(1), pp. 581-586. (10.1109/TMTT.2012.2226056)

2011

Pelaez-Perez, A. M., Alonso, J. I., Fernandez-Barciela, M. and Tasker, P. J. 2011. Validation of load-independent X-parameters. Presented at: Active RF Devices, Circuits and Systems Seminar, Belfast, Northern Ireland, 12 September 2011Active RF Devices, Circuits and Systems Seminar. IEEE pp. 47-50., (10.1049/ic.2011.0212)
Carrubba, V., Clarke, A. L., Akmal, M., Lees, J., Benedikt, J., Tasker, P. J. and Cripps, S. C. 2011. On the extension of the continuous class-F mode power amplifier. IEEE Transactions on Microwave Theory and Techniques 59(5), pp. 1294-1303. (10.1109/TMTT.2011.2117435)
Tasker, P. J. and Benedikt, J. 2011. Waveform inspired models and the harmonic balance emulator. IEEE Microwave Magazine 12(2), pp. 38-54. (10.1109/MMM.2010.940101)
Yusoff, Z. B., Akmal, M., Carrubba, V., Lees, J., Benedikt, J., Tasker, P. J. and Cripps, S. C. 2011. The benefit of GaN characteristics over LDMOS for linearity improvement using drain modulation in power amplifier system. Presented at: 2011 Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits, Vienna, Austria, 18-19 April 20112011 Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits (INMMIC 2011). New York: IEEE pp. 109-112., (10.1109/INMMIC.2011.5773334)
Carrubba, V., Lees, J., Benedikt, J., Tasker, P. J. and Cripps, S. C. 2011. A novel highly efficient broadband continuous class-F RFPA delivering 74% average efficiency for an octave bandwidth. Presented at: 2011 IEEE/MTT-S International Microwave Symposium, Baltimore, MD, USA, 5-10 June 20112011 IEEE/MTT-S International Microwave Symposium - MTT 2011. New York: IEEE pp. 350-353., (10.1109/MWSYM.2011.5972701)
Yusoff, Z. B., Lees, J., Benedikt, J., Tasker, P. J. and Cripps, S. C. 2011. Linearity improvement in RF power amplifier system using integrated Auxiliary Envelope Tracking system. Presented at: 2011 IEEE/MTT-S International Microwave Symposium, Baltimore, MD, USA, 5-10 June 2011 Presented at Seigel, P. et al. eds.2011 IEEE/MTT-S International Microwave Symposium - MTT 2011. New York: IEEE pp. 1752-1755., (10.1109/MWSYM.2011.5972769)
FitzPatrick, D., Saini, R., Lees, J., Benedikt, J., Cripps, S. C. and Tasker, P. J. 2011. A waveform engineering approach to the design of improved efficiency wideband MMIC amplifiers. Presented at: Wireless and Microwave Technology Conference (WAMICON), 2011 IEEE 12th Annual., Clearwater Beach, FL, USA, 18-19 April 20112011 IEEE 12th Annual Wireless and Microwave Technology Conference (WAMICON), Clearwater Beach, FL, 18-19 April 2011. Los Alamitos, CA: IEEE pp. 225-230., (10.1109/WAMICON.2011.5872859)
Hashmi, M. S., Ghannouchi, F. M., Tasker, P. J. and Rawat, K. 2011. Highly reflective load-pull. IEEE Microwave Magazine 12(4), pp. 96-107. (10.1109/MMM.2011.940595)
Akmal, M. et al. 2011. Linearity enhancement of GaN HEMTs under complex modulated excitation by optimizing the baseband impedance environment. Presented at: 2011 IEEE/MTT-S International Microwave Symposium, Baltimore, MD, USA, 5-10 June 2011 Presented at Seigel, P. et al. eds.2011 IEEE/MTT-S International Microwave Symposium - MTT 2011. New York: IEEE pp. 1747-1750., (10.1109/MWSYM.2011.5972833)
Smith, R. M., Cripps, S. C., Tasker, P. J., Benedikt, J. and Lees, J. 2011. A design methodology for the realization of multi-decade baluns at microwave frequencies. Presented at: 2011 IEEE/MTT-S International Microwave Symposium, Baltimore, MD, USA, 5-10 June 2011 Presented at Seigel, P. et al. eds.2011 IEEE/MTT-S International Microwave Symposium - MTT 2011. New York: IEEE pp. 1204-1208., (10.1109/MWSYM.2011.5972702)
Bell, J. J., Saini, R., Woodington, S. P., Lees, J., Benedikt, J., Cripps, S. C. and Tasker, P. J. 2011. Behavioral model analysis using simultaneous active fundamental load-pull and harmonic source-pull measurements at X-band. Presented at: 2011 IEEE/MTT-S International Microwave Symposium, Baltimore, MD, USA, 5-10 June 2011Microwave Symposium Digest (MTT), 2011 IEEE MTT-S International. New York: IEEE pp. 982-986., (10.1109/MWSYM.2011.5972803)
Powell, J. R. et al. 2011. GaAs X-band high efficiency (65%) broadband (30%) amplifier MMIC based on the Class B to Class J continuum. Presented at: 2011 IEEE/MTT-S International Microwave Symposium, Baltimore, MD, USA, 5-10 June 2011 Presented at Seigel, P. et al. eds.2011 IEEE/MTT-S International Microwave Symposium - MTT 2011. New York: IEEE pp. 355., (10.1109/MWSYM.2011.5973350)
Saini, R. et al. 2011. High speed non-linear device characterization and uniformity investigations at X-band frequencies exploiting behavioral models. Presented at: 2011 77th ARFTG Microwave Measurement Conference (ARFTG), Baltimore, MD, USA, 10 June 2011Design and Measurement of Microwave Systems - Proceedings of the 2011 77th ARFTG Microwave Measurement Conference (ARFTG). Los Alamitos, CA: IEEE, (10.1109/ARFTG77.2011.6034552)
Carrubba, V. et al. 2011. High-speed device characterization using an active load-pull system and waveform engineering postulator. Presented at: 2011 77th ARFTG Microwave Measurement Conference (ARFTG), Baltimore, MD, USA, 10 June 2011Design and Measurement of Microwave Systems - Proceedings of the 2011 77th ARFTG Microwave Measurement Conference (ARFTG). Los Alamitos, CA: IEEE, (10.1109/ARFTG77.2011.6034553)
Canning, T. A. J., Almuhaisen, A., Lees, J., Benedikt, J., Cripps, S. C. and Tasker, P. J. 2011. Utilization of RF I-V waveform load-pull information to identify the role FET knee profile has on locating the efficiency maxima. Presented at: 2011 78th ARFTG Microwave Measurement Symposium (ARFTG), Tempe, AZ, USA, 1-2 December 2011Proceedings of the 2011 78th ARFTG Microwave Measurement Symposium (ARFTG) - High Power RF Measurement Techniques. Los Alamitos, CA: IEEE, (10.1109/ARFTG78.2011.6183864)
Saini, R., Bell, J. J., Williams, T., Lees, J., Benedikt, J. and Tasker, P. J. 2011. Interpolation and extrapolation capabilities of non-linear behavioural models. Presented at: 2011 78th ARFTG Microwave Measurement Symposium (ARFTG), Tempe, AZ, USA, 1-2 December 2011Proceedings of the 2011 78th ARFTG Microwave Measurement Symposium (ARFTG) - High Power RF Measurement Techniques. Los Alamitos, CA: IEEE, (10.1109/ARFTG78.2011.6183865)
Casbon, M. A., Tasker, P. J. and Benedikt, J. 2011. Waveform Engineering beyond the Safe Operating Region: Fully Active Harmonic Load Pull Measurements under Pulsed Conditions. Presented at: 2011 IEEE Compound Semiconductor Integrated Circuit Symposium (CSICS), Waikoloa, HI, USA, 16-19 October 2011Proceedings of the 2011 IEEE Compound Semiconductor Integrated Circuit Symposium (CSICS) - INTEGRATED CIRCUITS IN GaAs, InP, SiGe, GaN and Other Compound Semiconductors. Los Alamitos, CA: IEEE, (10.1109/CSICS.2011.6062435)
Carrubba, V. et al. 2011. Exploring the Design Space for Broadband PAs using the Novel "Continuous Inverse Class-F Mode". Presented at: 6th European Microwave Integrated Circuits Conference (EuMIC) 2011, Manchester, UK, 10-11 October 2011Proceedings of the 41st European Microwave Conference (EuMC). IEEE pp. 333-336.
Hone, T. et al. 2011. Optimized load modulation in a doherty amplifier using a current injection technique. Presented at: 6th European Microwave Integrated Circuits Conference (EuMIC) 2011, Manchester, UK, 10-11 October 2011Proceedings of the 6th European Microwave Integrated Circuits Conference (EuMIC). Los Alamitos, CA: IEEE pp. 296-299.
Akmal, M. et al. 2011. An enhanced modulated waveform measurement system for the robust characterization of microwave devices under modulated excitation. Presented at: Microwave Integrated Circuits Conference (EuMIC), 2011 European, Manchester, 10-11 October 2011Microwave Integrated Circuits Conference (EuMIC), 2011 European. IEEE pp. 180-183.
Pelaez-Perez, A. M., Alonso, J. I., Fernandez-Barciela, M., Rodriguez-Testera, A., Tasker, P. J. and Woodington, S. P. 2011. Experimental verification of analytical design equations based on X-parameters® for predicting role of series feedback. Presented at: Microwave Integrated Circuits Conference (EuMIC), 2011 European, Manchester, 10-11 October 2011Microwave Integrated Circuits Conference (EuMIC), 2011 European. IEEE pp. 148-151.
McGenn, W., Benedikt, J., Tasker, P. J., Powell, J. and Uren, M. 2011. RF waveform investigation of VSWR sweeps on GaN HFETs. Presented at: 6th European Microwave Integrated Circuits Conference (EuMIC) 2011, Manchester, UK, 10-11 October 2011Proceedings of the 6th European Microwave Integrated Circuits Conference (EuMIC). Los Alamitos, CA: IEEE pp. 17-20.
Paynter, M. et al. 2011. Non-linear large signal PA modelling for switching-mode operation (class-F/continuous class-F). Presented at: 6th European Microwave Integrated Circuits Conference (EuMIC) 2011, Manchester, UK, 10-11 October 2011Proceedings of the 6th European Microwave Integrated Circuits Conference (EuMIC). Los Alamitos, CA: IEEE pp. 152-155.
Almuhaisen, A., Lees, J., Cripps, S. C., Tasker, P. J. and Benedikt, J. 2011. Wide band high-efficiency power amplifier design. Presented at: 6th European Microwave Integrated Circuits Conference (EuMIC) 2011, Manchester, UK, 10-11 October 2011Proceedings of the 6th European Microwave Integrated Circuits Conference (EuMIC). Los Alamitos, CA: IEEE pp. 184-187.

2010

Pelaez, A., Rodriguez-Testera, A., Mojon, O., Fernandez-Barciela, M., Tasker, P. J. and Alonso, J. I. 2010. Utilization and validation of HBT nonlinear frequency domain behavioral models in the design and simulation of oscillator circuits. Presented at: 2010 European Microwave Conference (EuMC), Paris, France, 28-30 September 2010Proceedings of the 2010 European Microwave Conference (EuMC). Los Alamitos, CA: IEEE pp. 481-484.
Hashmi, M. S., Clarke, A. L., Lees, J., Helaoui, M., Tasker, P. J. and Ghannouchi, F. M. 2010. Agile harmonic envelope load-pull system enabling reliable and rapid device characterization. Measurement Science and Technology 21(5), article number: 55109. (10.1088/0957-0233/21/5/055109)
Hashmi, M. S., Clarke, A. L., Woodington, S. P., Lees, J., Benedikt, J. and Tasker, P. J. 2010. An accurate calibrate-able multiharmonic active load-pull system based on the envelope load-pull concept. IEEE Transactions on Microwave Theory and Techniques 58(3), pp. 656-664. (10.1109/TMTT.2010.2040403)
Clarke, A. L., Akmal, M., Lees, J., Tasker, P. J. and Benedikt, J. 2010. Investigation and analysis into device optimization for attaining efficiencies in-excess of 90% when accounting for higher harmonics. Presented at: IEEE MTT-S International Microwave Symposium, Anaheim, CA, USA, 23-28 May 20102010 IEEE MTT-S International Microwave Symposium Digest (MTT 2010). New York: IEEE pp. 1114-1117., (10.1109/MWSYM.2010.5517222)
Alghanim, A., Benedikt, J. and Tasker, P. 2010. Effect of low frequency memory on high power 12W LDMOS transistors intermodulation distortion. Proceedings of the World Academy of Science, Engineering and Technology 63, pp. 53-57.
Hashmi, M. S., Benedikt, J. and Tasker, P. 2010. Impact of group delay on the load emulation in multi-tone active envelope load-pull system. Australian Journal of Electrical and Electronics Engineering 7(1), pp. 83-88.
Akmal, M. et al. 2010. The effect of baseband impedance termination on the linearity of GaN HEMTs. Presented at: European Microwave Conference 2010, Paris, France. Vol. 561636. pp. 1046-1049.
Akmal, M. et al. 2010. The impact of baseband electrical memory effects on the dynamic transfer characteristics of microwave power transistors. Presented at: 2010 Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits (INMMIC), Gothenburg, Sweden. Vol. 548011. pp. 148-151.
Hashim, S., Hashmi, M. S., Benedikt, J. and Tasker, P. J. 2010. Effect of impedance variation around the fundamentals on PA distortions characteristics under wideband multi-tone stimulus. Presented at: IEEE Asia Pacific Conference on Circuits and Systems, Kuala Lumpur, Malaysia, 6-9 December 2010 Presented at Rohani, F. Z. et al. eds.Proceedings of the 2010 Asia Pacific Conference on Circuit and System, 6th – 9th December 2010, Kuala Lumpur, Malaysia. Los Alamitos, CA: IEEE pp. 1115-1118., (10.1109/APCCAS.2010.5775081)
Rodriguez-Testera, A., Mojon, O., Fernandez-Barciela, M., Sanchez, E. and Tasker, P. J. 2010. Nonlinear HBT table-based model including low-frequency noise effects. Electronics letters 46(9), pp. 635-636. (10.1049/el.2010.2883)
Mashad Nemati, H. et al. 2010. Evaluation of a GaN HEMT transistor for load- and supply-modulation applications using intrinsic waveform measurements. Presented at: IEEE MTT 2010 International Microwave Symposium, Anaheim, CA, USA, 23-28 May 20102010 IEEE MTT-S International Microwave Symposium Digest (MTT 2010). Piscataway, NJ: IEEE pp. 509-512., (10.1109/MWSYM.2010.5517696)
Woodington, S. P., Saini, R., Williams, D., Lees, J., Benedikt, J. and Tasker, P. J. 2010. Behavioral model analysis of active harmonic load-pull measurements. Presented at: IEEE MTT-S International Microwave Symposium, Anaheim, CA, USA, 23-28 May 2010Microwave Symposium Digest (MTT), 2010 IEEE MTT-S International. New York: IEEE pp. 1688-1691., (10.1109/MWSYM.2010.5517261)
Almuhaisen, A., Wright, P. T., Lees, J., Tasker, P. J., Cripps, S. C. and Benedikt, J. 2010. Novel wide band high-efficiency active harmonic injection power amplifier concept. Presented at: IEEE MTT-S International Microwave Symposium, Anaheim, CA, USA, 23-28 May 20102010 IEEE MTT-S International Microwave Symposium Digest (MTT 2010). New York: IEEE pp. 664-667., (10.1109/MWSYM.2010.5514759)
FitzPatrick, D. M., Williams, T., Lees, J., Benedikt, J., Cripps, S. C. and Tasker, P. 2010. Exploitation of active load-pull and DLUT models in MMIC design. Presented at: IEEE Radio Frequency Integrated Circuits Symposium, Anaheim, CA, USA, 23-25 May 2010Proceedings of the 2010 IEEE Radio Frequency Integrated Circuits Symposium May 23-25, 2010, Anaheim, California, USA. Piscataway, NJ: IEEE pp. 487-490., (10.1109/RFIC.2010.5477406)
McGenn, W., Powell, J., Uren, M., Benedikt, J. and Tasker, P. 2010. RF waveform method for the determination of the safe operating area of GaN HFET's for amplifiers subjected to high output VSWR. Presented at: European Microwave Week 2010: Connecting the World, (EuMIC 2010), Paris, France. Vol. 561371. pp. 282-285.
Bensmida, S. et al. 2010. Generic pre-distortion of a Class-J Power amplifier. Presented at: European Microwave Conference 2010, Paris, France. Vol. 561648. pp. 1022-1025.
Carrubba, V., Clarke, A. L., Akmal, M., Lees, J., Benedikt, J., Tasker, P. and Cripps, S. C. 2010. The continuous Class-F Mode mode power amplifier. Presented at: European Microwave Conference (EuMC) 2010, Paris, France. Vol. 561630. pp. 1674-1677.
Lees, J. et al. 2010. Waveform engineering applied to linear-efficient PA design. Presented at: 2010 IEEE 11th Annual Wireless and Microwave Technology Conference (WAMICON 2010), Melbourne Beach, USA, 12-13 April, 2010. Vol. 546184., (10.1109/WAMICON.2010.5461847)
Saini, R., Woodington, S. P., Lees, J., Benedikt, J. and Tasker, P. J. 2010. An intelligence driven active loadpull system. Presented at: 75th ARFTG Microwave Measurement Conference: Measurement of Modulated Signals for Communications, Anaheim, USA. Vol. 549632.
Akmal, M. et al. 2010. Minimization of baseband electrical memory effects in GaN HEMTs using active IF load-pull. Presented at: Asia-Pacific Microwave Conference (22nd : 2010), Yokahama-shi, Japan, 7-10 December 20102010 Asia-Pacific Microwave Conference proceedings : APMC 2010 : Dec. 7-10, Yokohama, Japan. Tokyo, Japan: Institute of Electronics, Information and Communication Engineers (IEICE) pp. 5-8.

2009

Wright, P., Lees, J., Benedikt, J., Tasker, P. and Cripps, S. C. 2009. A Methodology for Realizing High Efficiency Class-J in a Linear and Broadband PA. IEEE Transactions on Microwave Theory and Techniques 57(12), pp. 3196-3204. (10.1109/TMTT.2009.2033295)
Fitzpatrick, D. M., Lees, J., Sheikh, A., Benedikt, J. and Tasker, P. J. 2009. Systematic investigation of the impact of harmonic termination in the efficiency performance of above octave bandwidth microwave amplifiers. Presented at: European Microwave Conference, 2009 (EuMC 2009), Rome, Italy, 29 September - 1 October 2009European Microwave Week 2009 - "Science, Progress and Quality at Radiofrequencies": Conference Proceedings. London: Horizon House Publications pp. 1445-1448.
Cripps, S. C., Tasker, P., Clarke, A. L., Lees, J. and Benedikt, J. 2009. On the continuity of high efficiency modes in linear RF power amplifiers. IEEE Microwave and Wireless Components Letters 19(10), pp. 665-667. (10.1109/LMWC.2009.2029754)
Sheikh, A., Roff, C., Benedikt, J., Tasker, P. J., Noori, B., Wood, J. and Aaen, P. H. 2009. Peak class F and inverse class F drain efficiencies using Si LDMOS in a limited bandwidth design. IEEE Microwave and Wireless Components Letters 19(7), pp. 473-475. (10.1109/LMWC.2009.2022138)
Qi, H., Benedikt, J. and Tasker, P. 2009. Nonlinear Data Utilization: From Direct Data Lookup to Behavioral Modeling. IEEE Transactions on Microwave Theory and Techniques 57(6), pp. 1425-1432. (10.1109/TMTT.2009.2019996)
Roff, C. et al. 2009. Analysis of DC-RF Dispersion in AlGaN/GaN HFETs Using RF Waveform Engineering. IEEE Transactions of Electron Devices 56(1), pp. 13-19. (10.1109/TED.2008.2008674)
Hashim, S. J., Hashmi, M. S., Williams, T., Woodington, W., Benedikt, J. and Tasker, P. 2009. Active envelope load-pull for wideband multi-tone stimulus incorporating delay compensation. Presented at: 38th European Microwave Conference, 2008 (EuMC 2008), Amsterdam, The Netherlands, 27-31 October 2008Proceedings of the 38th European Microwave Conference, 2008 (EuMC 2008). Los Alamitos, CA: IEEE pp. 317-320., (10.1109/EUMC.2008.4751452)
Sheikh, A., Lees, J., Benedikt, J. and Tasker, P. J. 2009. Utilization of a measurement based CAD tool for enhanced pa design investigations. Presented at: 38th European Microwave Conference, 2008 (EuMC 2008), Amsterdam, The Netherlands, 27-31 October 2008Proceedings of the 38th European Microwave Conference, 2008 (EuMC 2008). Los Alamitos, CA: IEEE pp. 1671-1674., (10.1109/EUMC.2008.4751795)
Tasker, P. 2009. Practical Waveform Engineering. IEEE Microwave Magazine 10(7), pp. 65-76. (10.1109/MMM.2009.934518)
Hashmi, M. S., Clarke, A. L., Woodington, S. P., Lees, J., Benedikt, J. and Tasker, P. 2009. Electronic Multi-Harmonic Load-Pull System for Experimentally Driven Power Amplifier Design Optimization. Presented at: IEEE/MTT-S International Microwave Symposium 2009, Boston, USA. pp. 1549-1552.
Kang, I., Zhang, H., Yun, Y., Tasker, P., Benedikt, J. and Porch, A. 2009. High quality factor extraction of miniaturised coupled line bandpass filter implemented using RF silicon integrated circuits. Presented at: Proceedings 39th European Microwave Conference (EuMC 2009), Rome, Italy. pp. 830-833., (10.1109/EUMC.2009.5295966)
Wright, P. T., Lees, J., Tasker, P. J., Benedikt, J. and Cripps, S. C. 2009. An Efficient, Linear, Broadband Class-J-Mode PA Realised Using RF. Presented at: IEEE/MTT-S International Microwave Symposium 2009, Boston, MA, USA, 7-12 June 2009IEEE MTT-S International Microwave Symposium Digest, 2009. MTT '09. Los Alamitos, CA: IEEE pp. 653-656., (10.1109/MWSYM.2009.5165781)
Tasker, P. J. 2009. RF Waveform Measurement and Engineering. Presented at: Annual IEEE Compound Semiconductor Integrated Circuit Symposium, 2009. CISC 2009, Greensboro, NC, USA, 11-14 October 2009Integrated Circuits in GaAs, InP, SiGe, GaN, and Other Compound Semiconductors - Proceedings of the Annual IEEE Compound Semiconductor Integrated Circuit Symposium, 2009. CISC 2009. Los Alamitos, CA: IEEE, (10.1109/csics.2009.5315818)
Bensmida, S. et al. 2009. Power amplifier memory-less pre-distortion for 3GPP LTE application. Presented at: European Microwave Conference, 2009 (EuMC 2009), Rome, Italy, 29 September - 1 October 2009European Microwave Week 2009 - "Science, Progress and Quality at Radiofrequencies": Conference Proceedings. London: Horizon House Publications pp. 1433-1436.

2008

Alghanim, A., Lees, J., Williams, T., Benedikt, J. and Tasker, P. J. 2008. Sensitivity of electrical baseband memory effects to higher-order IF components for high-power LDMOS power amplifiers. Electronics Letters 44(5), pp. 358-359. (10.1049/el:20083348)
Alghanim, A., Lees, J., Williams, T., Benedikt, J. and Tasker, P. 2008. Reduction of electrical baseband memory effect in high-power LDMOS devices using optimum termination for IMD3 and IMD5 using active load-pull. Presented at: IEEE MTT-S International Microwave Symposium Digest, Atlanta, USA. pp. 415-418., (10.1109/MWSYM.2008.4633191)
FitzPatrick, D. M., Williams, T., Lees, J., Benedikt, J. and Tasker, P. 2008. Large signal device characterisation using active load-pull for improved MMIC design. Presented at: IET Seminar on RF and Microwave IC Design, London, UK. IET pp. 1-7.
Hashmi, M. S., Hashim, S. J., Woodington, S., Williams, T., Benedikt, J. and Tasker, P. 2008. Active envelope load pull system suitable for high modulation rate multi-tone applications. Presented at: Integrated Nonlinear Microwave & Millimetre-Wave Circuits 2008 Workshop (INMMIC 2008), Malaga, Spain. pp. 93-96., (10.1109/INMMIC.2008.4745724)
Wright, P. T., Sheikh, A., Roff, C., Tasker, P. J. and Benedikt, J. 2008. Highly efficient operation modes in GaN power transistors delivering upwards of 81% efficiency and 12W output power. Presented at: IEEE MTT-S International Microwave Symposium, Atlanta, GA, USA, 15-20 June 2008Proceedings of the IEEE MTT-S International Microwave Symposium Digest, Atlanta, USA, 15-20 June 2008. Piscataway, NJ: Institute of Electrical and Electronics Engineers pp. 1147-1150., (10.1109/MWSYM.2008.4633260)
Jiangtao, S., Benedikt, J. and Tasker, P. 2008. A new method for the design of multi-sine excitations for the assessment of non-linear devices. Presented at: Microwave Symposium Digest, 2008 IEEE MTT-S International, Atlanta, GA. pp. 265-268., (10.1109/MWSYM.2008.463315)
Lees, J., Williams, T., Woodington, S., McGovern, P., Cripps, S. C., Benedikt, J. and Tasker, P. 2008. Demystifying Device related Memory Effects using Waveform Engineering and Envelope Domain Analysis. Presented at: 38th European Microwave Conference 2008 (EuMC 2008), Amsterdam, The Netherlands. pp. 753-756., (10.1109/EUMC.2008.471562)
Roff, C. et al. 2008. Pulsed-IV and RF waveform measurements of unique high-K dielectric GaN MOSFETs. Presented at: IEEE International Conference on Microwaves, Communications, Antennas and Electronic Systems (COMCAS), Tel Aviv, Israel. , (10.1109/COMCAS.2008.4562790)
Sheikh, A., Roff, C., Benedikt, J., Tasker, P. J., Noori, B., Aaen, P. and Wood, J. P. 2008. Systematic waveform engineering enabling high efficiency modes of operation in Si LDMOS at both L-band and S-band frequencies. Presented at: IEEE MTT-S International Microwave Symposium Digest, Atlanta, USA. pp. 1143-1146., (10.1109/MWSYM.2008.4633259)
Su, J., Benedikt, J. and Tasker, P. J. 2008. A new method for the design of multi-sine excitations for the assessment of non-linear devices. Presented at: IEEE MTT-S International Microwave Symposium Digest, Atlanta, USA. pp. 265-268., (10.1109/MWSYM.2008.4633154)
Williams, T., Mojon, O., Woodington, S. P., Lees, J., Barciela, M. F., Benedikt, J. and Tasker, P. J. 2008. A robust approach for comparison and validation of large signal measurement systems. Presented at: IEEE MTT-S International Microwave Symposium Digest, Atlanta, USA. pp. 257-260., (10.1109/MWSYM.2008.4633152)
Woodington, S. P. et al. 2008. A novel measurement based method enabling rapid extraction of a RF waveform look-up table based behavioural model. Presented at: IEEE MTT-S International Microwave Symposium Digest, Atlanta, USA. pp. 1453-1456., (10.1109/MWSYM.2008.463305)
Wright, P. T., Lees, J., Tasker, P. J. and Benedikt, J. 2008. GaN power transistors in narrow and wide bandwidth applications. Presented at: IET Seminar on Wideband Receivers and Components, London, UK. pp. 1.

2007

Benedikt, J., Qi, H. and Tasker, P. . J. 2007. Novel Nonlinear Model for Rapid Waveform-based Extraction Enabling Accurate High Power PA Design. Presented at: IEEE MTT-S International Microwave Symposium Digest 2007. , (10.1109/MWSYM.2007.380246)
Roff, C., Benedikt, J. and Tasker, P. J. 2007. Design Approach for Realization of Very High Efficiency Power Amplifiers. Presented at: IEEE MTT-S International Microwave Symposium Digest 2007. , (10.1109/MWSYM.2007.380310)
Roff, C. et al. 2007. Detailed analysis of DC-RF dispersion in AlGaN/GaN HFETs using waveform measurements. Presented at: 1st European Microwave Integrated Circuits Conference, Manchester, UK, 10-13 Sept 20062006 European Microwave Integrated Circuits Conference. IEEE pp. 43., (10.1109/EMICC.2006.282745)
Gaddi, R., Williams, T., Benedikt, J., Tasker, P., Giacomozzi, F., Margesin, B. and Gnudi, A. 2007. Large-Signal Vectorial Load - Pull Characterization of MEMS RF-Actuation. IEEE Microwave and Wireless Components Letters 17(12), pp. 903-905. (10.1109/LMWC.2007.908049)
Alghanim, A., Lees, J., Wiliams, T., Benedikt, J. and Tasker, P. 2007. Investigation of electrical base-band memory effects in high power 20w LDMOS power amplifiers. Presented at: 37th European Microwave Conference, Munich, Germany. pp. 48-51., (10.1109/EUMC.2007.4405122)
Rodrigues-Testera, A., Fernandez-Barciela, M., Frenandez-Manin, G., Mojon, O., Sanchez, E. and Tasker, P. 2007. Fully functional nonlinear table-based HBT model with explicit thermal feedback. IEEE Microwave and Wireless Component letters 17(8), pp. 601-603.
Hashmi, M. S., Hashim, S. J., Williams, T., Benedikt, J. and Tasker, P. 2007. A broadband control electronics for envelope load pull system. Presented at: International Symposium on Signals, Systems and Electronics (ISSSE07), Montreal, Canada. pp. 197-200., (10.1109/ISSSE.2007.4294447)
Benedikt, J. and Tasker, P. 2007. Characterisation of high power RF transistors: Waveform measurement and engineering. Presented at: Proceedings Workshop on Advances in Active Device Characterisation and Modelling for RF and Microwave, IEEE MTT-S International Microwave Symposium.
Roff, C. et al. 2007. Optimising GaN/AIGaN HFET designs for high efficiency. Presented at: 2nd European Microwave Integrated Circuits Conference (EuMIC 2007), Munich, Germany. pp. 165-168., (10.1109/EMICC.2007.4412674)
Sheikh, A., Tasker, P. J., Lees, J. and Benedikt, J. 2007. The impact of system impedance on the characterisation of high power devices. Presented at: 37th European Microwave Conference (EuMC), Munich, Germany. pp. 949-952., (10.1109/EUMC.2007.4405315)
Alghanim, A., Lees, J., Williams, T., Benedikt, J. and Tasker, P. J. 2007. Using active IF load-pull to investigate electrical base-band induced memory effects in high-power LDMOS transistors. Presented at: Asia-Pacific Microwave Conference (APMC 2007), Bangkok, Thailand. IEEE pp. 1-4., (10.1109/APMC.2007.4554737)
Tasker, P. J. and Benedikt, J. 2007. Waveform measurement and characterisation: The multi-tone characterisation challenge. Presented at: Proceedings of Workshop on RF power transistor and amplifier characterisation techniques, IEEE 2007 Radio and Wireless Symposium, Long Beach, USA.

2006

Qi, H., Benedikt, J. and Tasker, P. J. 2006. A novel approach for effective import of nonlinear device characteristics into CAD for large signal power amplifier design. Presented at: IEEE MTT-S International Microwave Symposium Digest 2006. pp. 477-480., (10.1109/MWSYM.2006.249596)
Aboush, Z., Benedikt, J., Priday, J. and Tasker, P. 2006. DC-50 GHz low loss thermally enhanced low cost LCP package process utilizing mico via technology. Presented at: 2006 IEEE Microwave Symposium, San Francisco, USA. pp. 961-964.
Mayer, M., Arthaber, H., Magerl, G., Kother, D., Lees, J., Benedikt, J. and Tasker, P. 2006. Advanced load pull systems. Presented at: The Institution of Engineering and Technology Seminar on High Efficiency Power Amplifier Design for Next Generation Wireless Applications, Cambridge, UK. pp. 27-54.
Lees, J., Sheikj, A., Benedikt, J. and Tasker, P. 2006. The Design of a Gallium Nitride Doherty Amplifier using Waveform Measurements and Active Harmonic Load-Pull. Presented at: 2006 International Workshop on Integrated Nonlinear Microwave and Millimeter-Wave Circuits, Aveiro, Portugal. pp. 26-29.
Roff, R. et al. 2006. Detailed analysis of DC-RF dispersion in AIGaN/GaN NFETs using waveform measurements. Presented at: 1st European Microwave Integrated Circuits Conference (EuMIC), Manchester, UK. pp. 43-45.
Tudor, W., Benedikt, J. and Tasker, P. J. 2006. Full functional 'real time' non-linear device characterization system incorporating active load control. Presented at: 36th European Microwave Conference. pp. 1610-1613.
Uren, M. J. et al. 2006. Control of short-channel effects in GaN/AIGaN HFETs. Presented at: 1st European Microwave Integrated Circuits Conference, Manchester, UK. pp. 65-68.
Uren, M. et al. 2006. Control of Short-Channel Effects in GaN/AlGaN HFETs. Presented at: 1st European Microwave Integrated Circuits Conference, Manchester, UK, 10-13 Sept 20062006 European Microwave Integrated Circuits Conference. IEEE pp. 65-65., (10.1109/EMICC.2006.282751)

2005

Aboush, Z., Lees, J., Benedikt, J. and Tasker, P. J. 2005. Active harmonic load-pull system for characterising highly mismatched high power transistors. Presented at: IEEE MTT-S International Microwave Symposium Digest 2005, 2005. , (10.1109/MWSYM.2005.1516920)
Williams, T., Tasker, P. J. and Benedikt, J. 2005. Experimental evaluation of an active envelope load pull architecture for high speed device characterization. Presented at: IEEE MTT-S International Microwave Symposium Digest 2005. IEEE, (10.1109/MWSYM.2005.1516980)
Aboush, Z., Benedikt, J., Priday, J. and Tasker, P. 2005. Novel cost-efficient packaging technology for high-power LDMOS devices. Presented at: 10th IEEE High Frequency Postgraduate Student Colloquium, Leeds, UK. pp. 15-18.
Aboush, Z. et al. 2005. High power active harmonic load-pull system for characterisation of high power 100-Watt transistors. Presented at: 35th European Microwave Conference, Paris, France, Vol. 1. pp. 609-612., (10.1109/EUMC.2005.1608930)
Alghanim, A., Benedikt, J. and Tasker, P. 2005. A measurement test-set for characterisation of high power LDMOS transistors including memory effects. Presented at: 10th IEEE High Frequency Postgraduate Student Colloquium, Leeds, UK. pp. 29-32.
Lees, J. et al. 2005. Experimental gallium nitride microwave Doherty amplifier. IEEE Electronic Letters 41(23), pp. 1284-1285. (10.1049/el:20053155)
McGovern, P. et al. 2005. Analysis of DC-RF dispersion in AlGaN/GaN HFETs using pulsed I-V and time-domain waveform measurements. Presented at: Microwave Symposium Digest, IEEE MTT-S International, Atlanta, USA. pp. 503-506.
Qi, H., Benedikt, J. and Tasker, P. 2005. Direct extraction of large-signal table-based behavioural models from time-domain voltage and current waveforms. Presented at: 10th IEEE High Fequency Postgraduate Student Colloquium, Leeds, UK. pp. 25-28.
Kharji, O. A., Williams, T., Benedikt, J. and Tasker, P. 2005. A broadband envelope load pull system. Presented at: 10th IEEE High Frequency Postgraduate Student Colloquium, Leeds, UK. pp. 21-24.
Lees, J. et al. 2005. Characterisation of an experimental gallium nitride microwave Doherty amplifier. Presented at: 35th European Microwave Conference, Paris, France, 4-6 October 200535th European Microwave Conference: conference proceedings. Horizon House
Williams, T., Benedikt, J. and Tasker, P. J. 2005. Application of a novel active envelope load pull architecture in large signal device characterisation. Presented at: 35th European Microwave Conference, Paris, France.

2004

McGovern, P. et al. 2004. Single-tone and two-tone time-domain large signal characterization of GaN HFETs operated in class A. Presented at: IEEE MTT-S International Microwave Symposium Digest 2004, Vol 2, 2004. pp. 825-828., (10.1109/MWSYM.2004.1339092)
Aboush, Z., Benedikt, J. and Tasker, P. 2004. High power harmonic active load-pull using broadband matching networks. Presented at: 9th IEEE High Frequency Postgraduate Student Colloquium, Manchester, UK. pp. 145-150.
Lees, J., Haczewski, J., Benedikt, J. and Tasker, P. 2004. An automated multi-stimulus measurement system for characterising multi-device amplifiers. Presented at: 34th European Microwave Conference, Amsterdam, The Netherlands, Vol. Nov-15. pp. 435-438.
Williams, T., Benedikt, J. and Tasker, P. J. 2004. Novel base-band envelope load pull architecture. Presented at: 9th IEEE High Frequency Postgraduate Student Colloquium, Manchester, UK. pp. 157-161.

2003

Williams, D. J., Leckey, J. and Tasker, P. J. 2003. Envelope domain analysis of measured time domain voltage and current waveforms provide for improved understanding of factors effecting linearity. Presented at: IEEE MTT-S International Microwave Symposium Digest 2003, Vol 2, 2003. pp. 1411-1412., (10.1109/MWSYM.2003.1212636)
Lees, J., Goss, M., Benedikt, J. and Tasker, P. 2003. Single-tone optimisation of an adaptive-bias Doherty structure. Presented at: Microwave Symposium Digest, IEEE MTT-S International, Philadelphia, USA, 8-13 June 2003Microwave Symposium Digest, IEEE MTT-S International, Vol. 3. IEEE pp. 2213-2216., (10.1109/MWSYM.2003.1210604)

2002

Williams, D. J., Leckey, J. and Tasker, P. J. 2002. A study of the effect of envelope impedance on intermodulation asymmetry using a two-tone time domain measurement system. Presented at: 2002 IEEE MTT-S International Microwave Symposium, Seattle, WA, USA, 2-7 June 20022002 IEEE MTT-S International Microwave Symposium Digest, Vol. 3. Los Alamitos, CA: IEEE pp. 1841-1844., (10.1109/MWSYM.2002.1012221)
Hawkes, J. ., Coakley, W. T., Groschl, M., Benes, E., Armstrong, H. S., Tasker, P. and Nowotny, H. 2002. Single half-wavelength ultrasonic particle filter: predictions of the transfer matrix multilayer resonator model and experimental filtration results. Journal of the Acoustical Society of America 111(3), pp. 1259-1266. (10.1121/1.1448341)
Benedikt, J. and Tasker, P. 2002. High power time-domain measurement bench for power amplifier development. Presented at: Asia-Pacific Microwave Conference, Institute of Electronics, Information and Communication Engineers (IEICE), Kyoto, Japan. pp. 303-306.
Tasker, P. J. 2002. Non-linear vector network analyser – simply what is it and what can it do?. Presented at: 58th ARFTG Conference, San Diego, USA.
Tasker, P. J. and Benedikt, J. 2002. High-power time-domain measurement bench for power amplifier development. Presented at: 59th ARFTG Conference Digest, Seattle, USA. pp. 107-110.
Tasker, P. J. and Fernandez-Barciela, M. 2002. HBT small signal T and pi model extraction using a simple, robust and fully analytical procedure. Presented at: IEEE MTT-S International Microwave Symposium, Seattle, USA, Vol. 3. pp. 2129-2132.

2001

Gaddi, R., Pla, A. and Tasker, P. J. 2001. Harmonic power generation from the non-linear output capacitance of silicon LDMOS devices. Presented at: 6th IEEE High Frequency Postgraduate Student Colloquium, Cardiff, UK, 9-10 September 20016th IEEE High Frequency Postgraduate Student Colloquium (Cardiff, UK). IEEE pp. 1-6., (10.1109/HFPSC.2001.962148)
Gaddi, R., Pla, J. A., Benedikt, J. and Tasker, P. J. 2001. LDMOS electro-thermal model validation from large-signal time-domain measurement. Presented at: IEEE MTT-S International Microwave Symposium Digest 2001, Phoenix, AZ, USA, 20-25 May 2001Microwave Symposium Digest, IEEE MTT-S International (Phoenix, USA), Vol. 1. pp. 399-402.
Morgan, D. G., D., E. G., Phillips, A. and Tasker, P. 2001. Full extraction of PHEMT state functions using time domain measurement. Presented at: IEEE MTT-S International Microwave Symposium, Phoenix, USA, Vol. 2. pp. 823-826.
Morgan, D. G. and Tasker, P. 2001. Extraction of state function behaviour from large signal waveform measurements. Presented at: 6th IEEE High Frequency Postgraduate Student Colloquium, Cardiff, UK. pp. 88-93.
Williams, D. J. and Tasker, P. 2001. Automated active source and load pull measurement system. Presented at: 6th High Frequency Postgraduate Student Colloquium, Cardiff, UK, 9-10 September 2001 Presented at Tasker, P. and Porch, A. eds.2001 High Frequency Postgraduate Student Colloquium. Piscataway, N.J: IEEE Computer Society pp. 7-12.

2000

Benedikt, J., Gaddi, R., Tasker, P. J. and Goss, M. 2000. High-power time-domain measurement system with active harmonic load-pull for high-efficiency base-station amplifier design. IEEE Transactions on Microwave Theory and Techniques 48(12), pp. 2617-2624. (10.1109/22.899021)
Benedikt, J., Gaddi, R., Tasker, P. J., Goss, M. and Zadeh, M. 2000. High power time domain measurement system with active harmonic load-pull for high efficiency base station amplifier design. Presented at: 2000 IEEE MTT-S International Microwave Symposium, Boston, MA, USA, 11-16 June 2000 Presented at Perkins, T. ed.2000 IEEE MTT-S International Microwave Symposium Digest, Vol. 3. Los Alamitos, CA: IEEE pp. 1459-1462., (10.1109/MWSYM.2000.862249)

Research theme: Health, Technology and the Digital World

Contracts

Title	People	Sponsor	Value	Duration
KTC Green Communication (Convergence)	McCann DJ, Benedikt J, Tasker PJ	National Assembly for Wales (A4B)	135550	01/08/2009 - 31/07/2012
Nonlinear modelling from nonlinear data	Tasker P	Agilent Technologies	19145	01/10/2013 - 30/09/2016
Advancing the Design of Millimeter-Wave Technology and MMICs	Tasker P	United States Army - Research Laboratories	44236	01/09/2014 - 31/03/2015
Semiconductor device noise characterisation	Tasker P	Astrium	10500	14/10/2011 - 13/12/2011
Advance uptake of the ''Cardiff Model''	Tasker P, Bendikt J	EPSRC	44276	01/07/2013 - 30/06/2014
Research into GeN solid state RF power sources for seekers.	Tasker P, Benedikt J	United Monolithic Semiconductors	87260	24/03/2011 - 23/03/2012
Ultra-high efficiency x-band device modelling for Sat comms	Tasker P, Casbon M	Cobham CTS Ltd	40000	01/07/2012 - 31/01/2013
Characterisation of semiconductor devices fabricated at WIN semiconductors using fan diagram techniques	Tasker P, Casbon M	WIN SEMICONDUCTOR CORP	17600	01/01/2013 - 30/04/2014
Characterisation of GaN devices using continuous-wave fan-diagram techniques	Tasker P, Casbon M	WIN Semiconductors Corp	6000	01/08/2012 - 31/01/2013
High frequency properties of GaN switches	Tasker P, Casbon M	BALFOUR BEATTY RAIL LTD	8035	01/07/2012 - 31/12/2012
Development of robust broadband Power amplifiers based on high voltage HBT's	Tasker P, Cripps S	TriQuint WJ Inc	27500	01/10/2012 - 30/09/2015
RF Power Amplifiers based upon Silicon-Germanium (SiGe) BiCMOS technology (studentship)	Tasker P, Lees J	SiGe Semiconductor (Europe) Ltd	30000	01/10/2010 - 31/03/2014
Baseband linearisation schemes for high efficiency power amplifiers	Tasker P, Lees J	Infinion Technologies North America Corp	35000	01/01/2015 - 31/12/2017
High performance buffers for RF GaN electronics	Tasker P, Lees J	EPSRC	249999	01/10/2016 - 31/03/2020
NRN advanced engineering and materials	Bowen P, Porch A, Tasker PJ	Ser Cymru NRN AEM Swansea	5000	01/09/2013 - 31/08/2018
Noise and s-parameter measurement of hittite HMC442 and HMC449 devices	Dr J Benedikt, Mr J Lees, Prof PJ Tasker	EADS Astrium Limited	16028	17/07/2006 - 17/12/2006
Noise and s-parameter measurement of hittite HMC442 and HMC449 devices	Dr J Benedikt, Mr J Lees, Prof PJ Tasker	EADS Astrium Limited	3512	17/07/2006 - 17/12/2006
Novel development methodology for highly-efficient and ultra-broadband remote sensing applications	Dr J Benedikt, Prof PJ Tasker	Selex Sensors and Airborne Systems Ltd	277573	01/04/2007 - 30/09/2010
MMIC Interconnect and packaging	Dr J Benedikt, Prof PJ Tasker	Labtech Ltd	21000	01/10/2004 - 01/10/2007
Diagnostic Rhyme Testing	Dr J Benedikt, Prof PJ Tasker	EADS Defence and Security Systems Ltd	40704	12/12/2005 - 11/02/2006
Capital equipment addressing new markets and leveraging in extra funding to Wales	Dr J Benedikt, Prof PJ Tasker, Dr A Porch	National Assembly for Wales (KEF)	247700	15/11/2006 - 01/04/2007
Speech intelligibility testing	Dr J Benedikt, Prof PJ Tasker, Mr J Lees	EADS Astrium Limited	87950	01/11/2006 - 28/02/2007
KTC Green Communication (Non-Convergence)	McCann DJ, Tasker PJ, Benedikt J	National Assembly for Wales (A4B)	235368	01/08/2009 - 01/08/2012
Microphone evaluation and correction	Prof JA Chambers, Prof RA Belcher, Prof PJ Tasker	QinetiQ Ltd	73873	01/11/2006 - 30/06/2008
Microphone evaluation and correction	Prof JA Chambers, Prof RA Belcher, Prof PJ Tasker	QinetiQ Ltd	2000	01/11/2006 - 30/06/2008
MNT 2004 Training for the future	Prof PJ Tasker, Mr GJ Sparey-Taylor	Coleg Sir Gar	8533	01/05/2004 - 30/09/2004
Micro nano education and training consortium (MNTec)	Mr G Sparey-Taylor, Prof PJ Tasker	Welsh Development Agency	35000	01/07/2004 - 01/04/2005
Power transistor and amplifier characterization and modelling using modulated waveforms in non 50 ohm environments	Benedikt J, Tasker PJ	Agilent Technologies	14588	09/06/2008 - 08/06/2009
Micro nano education and training consortium (MNTec)	Barrow DA, Mr GJ Sparey-Taylor, Tasker PJ	Welsh Development Agency	306000	01/04/2005 - 31/03/2006
Investigation and design of HTB power amplifiers for WuMax Applications	Benedikt J, Tasker PJ	Mimex Europe Ltd	9712	25/09/2006 - 24/02/2010
Noise and s-parameter measurement of hittite HMC442 and HMC449 devices	Benedikt J, Tasker PJ, Lees J	EADS Astrium Limited	3512	17/07/2006 - 17/12/2006
Waveform Engineering in Manufacturing	Benedikt J, Tasker P	EPSRC	60167	01/01/2014 - 31/12/2014
Rapid identification of Broadband and efficient PA modes	Benedikt J, Tasker P	FutureWei Technologies Inc	30863	01/01/2015 - 31/12/2015
Development of linear HBT power amplifiers	Benedikt J, Tasker PJ	Mimex Europe Ltd	21000	25/09/2006 - 24/02/2010
Novel development methodology for highly-efficient and ultra-broadband remote sensing applications (with extension)	Benedikt J, Tasker PJ	Selex Sensors and Airborne Systems Ltd	277573	01/04/2007 - 30/09/2010
Broadband doherty PA key techniques	Benedikt J, Tasker PJ	Huawei	138000	18/09/2014 - 30/09/2016
Characterization of nonlinearities of the high power devices under multi signal exitation	Benedikt J, Tasker PJ	Nokia Corporation	46800	01/10/2004 - 30/09/2007
Research on wide band gap semiconductor structures and devices.	Dr R Perks, Prof P Blood, Prof PJ Tasker	Engineering and Physical Sciences Research Council	192608	01/01/2001 - 31/12/2003
III-V Epitaxial Layer Optimization for High Frequency Electronic Devices Based on RF Characterization	Hirshy H, Tasker P, Perks R, Benedikt J	Ser Cymru NRN AEM Swansea	190000	01/09/2015 - 31/08/2018
Development and Realisation of Novel, Broadband, High-Efficiency Power Amplifiers (studentship)	Lees J, Tasker P	Freescale Semiconductor France SAS	50000	01/01/2012 - 31/12/2014
High Performance power amplifiers for phased array radar and point to point communication applications	Lees J, Tasker P	M/A COM Technology Solutions (UK) Ltd	45000	01/10/2011 - 30/09/2014
Integrating High-Performance Power Amplifier with Miniturized Wideband Antenna for Highly-Efficient Future Communication Devices	Lees J, Tasker P, Cripps S	Ser Cymru NRN AEM Swansea	59350	01/10/2014 - 30/09/2017
Development and realisation of novel broadband high efficiency power amplifiers	Tasker P, Lees J	Freescale Semiconductors France SAS	50000	01/10/2012 - 30/09/2015
GaN electronics: RF reliability and detradation mechanisms	Tasker P, Lees J	EPSRC	222392	01/01/2013 - 31/12/2015
Integration of RF Circuits with High Speed GaN Switching on Silicon Substrates	Tasker P, Lees J, Benedikt J	EPSRC	835074	01/04/2016 - 31/03/2019
Characterization and design of power amplifiers for mobile communications	Tasker PJ	Celeritek Uk Ltd	21000	01/10/2002 - 16/01/2004
Travel grant	Tasker PJ	Welsh Development Agency	3500	15/11/2002 - 20/11/2002
EMRS DTC high efficiency amplifier project	Tasker PJ	Qinetiq	69000	01/09/2009 - 31/08/2010
Exploit the unique complementary activities of RF characterization and GaN fabrication to demonstrate higher performance (power/efficiacy/robustness) RF power and low noise GaN microwave devices	Tasker PJ, Benedikt J	Qinetiq Ltd	21263	01/10/2008 - 31/03/2012
Holistic design of power amplifiers for future wireless systems	Tasker PJ, Benedikt J	EPSRC	1157919	01/04/2008 - 30/09/2013
Top amplifier research groups in a European team (TARGET)	Tasker PJ, Benedikt J	Commission of European Communities	316800	01/01/2004 - 30/06/2005
RF measurement on GaN transistors and passives	Tasker PJ, Benedikt J	QinetiQ Ltd	41031	13/09/2004 - 13/06/2006
Characterisation and comparison of packaged GaN devises	Tasker PJ, Benedikt J, Lees J,	Cree Inc	16931	01/05/2008 - 01/09/2008
Dynamic Characterisation and modelling of RF GaN HEMTs	Tasker PJ, Lees J	Ser Cymru NRN AEM Swansea	81300	01/10/2014 - 30/09/2017
Study of ADC linearisation methods for improving dynamic range	Tasker PJ, Prof RA Belcher Belcher RA, Tasker PJ	Roke Manor Research Ltd	18500	01/07/2007 - 31/12/2007
Institute for Compound Semiconductors	Thomas HR, Tasker P, Griffin M, Smowton P, Buckle P (PHYSX),	Welsh Government	6000000	01/04/2015 - 31/03/2018
Characterization, analysis and recommendations for drain efficiency of the VHV8 platform above 1GHz	Cripps S, Tasker P	Freescale Semiconductor	33710	23/04/2014 - 22/10/2014

Supervised Students

Title	Student	Status	Degree
High Power Waveform Engineering	SHEIKH Aamir	Graduate	PhD
A novel Approach For Wide Band High-Efficiency Power Amplifier Design	ALMUHAISEN Abdullah	Graduate	PhD
Microwave Amplifier Design	ALGHANIM Abdulrahman	Graduate	PhD
Investigation of Novel Measurement Techniques for Microwave Devices	ALDOUMANI Anoor	Current	PhD
MODULATION SCHEMES FOR FUTURE MOBILE COMMUNICATION SYSTEMS INTEGRATING THE NONLINEAR BEHAVIOUR OF RF FRONT END	AL RAWACHY Azam Asamm Daood	Current	PhD
Radio Frequency Power Amplifier Linearization Technique	NOORI Basim	Current	PhD
Novel Multiple Antenna Techniques for Improved Diversity in Wireless Communications Systems	SHEN Cheng	Graduate	PhD
Application of Waveform Engineering to GaN Characterisation and Class F Design	ROFF Christopher Joseph	Graduate	PhD
THE EXPERIMENTAL CHARACTERISATION AND MODELLING OF MICROWAVE FET's	MORGAN David Gareth	Graduate	PhD
NON-LINEAR MEASUREMENT SYSTEM TECHNIQUES FOR RF POWER AMPLIFIERS DESIGN	WILLIAMS David James	Graduate	PhD
DEVELOPMENT OF ROBUST BROADBAND POWER AMPLIFIERS BASED ON HIGH VOLTAGE HBTS.	LOESCHER David John	Current	PhD
Novel MMIC Design Process Using Waveform Engineering	FITZPATRICK Dominic	Graduate	PhD
NOVEL POWER AMPLIFIER DESIGN USING NON-LINEAR MICROWAVER CHARACTERISATION AND MEASUREMENT TECHNIQUES	OGBOI Friday Lawrence	Graduate	PhD
BASEBAND LINEARISATION SCHEMES FOR HIGH EFFICIENCY POWER AMPLIFIERS.	WANG Guefeng	Current	PhD
Comms and IT	QI Hao	Graduate	PhD
On the Development of a Novel Enveloped Load Pull Measurement System	WEE Hoe Cher	Graduate	MPhil
Input Harmonic And Mixing Behavioural Model Analysis	BELL James	Graduate	PhD
Multi-Sines Stimulus Design For The Assessment Of Non-Linear Devices	SU Jiangtao	Graduate	PhD
Algorithms and Techniques for Polynominal Matrix Decompositions	FOSTER Joanne Alexandra	Graduate	PhD
Novel High Frequency Power Amplifier Design System	BENEDIKT Johannes	Graduate	PhD
The investigation, Development and Implementation of RF-PA Structures Possessing High Efficiency over Wide Dynamic Range	LEES Jonathan	Graduate	PhD
Wideband Active Envelope Load-Pull for Robust Power Amplifier and Transistor Characterisation.	HASHIM khali	Graduate	PhD
Digital Signal Processing for Future MIMO-OFDM Wireless Communication Systems	ZHANG Li	Graduate	PhD
COMMUNICATIONS SYSTEMS	CASBON Michael	Current	PhD
High performance power amplifiers for phased array radar and point to point communication application.	KOH Minghao	Thesis Submitted	PhD
Analysis, Realization And Evaluation Of Envelope Load Pull System For Both CW And Multi-Tone Applications	HASHMI Mohammad Shabi	Graduate	PhD
An Enhanced Modulated Waveform Measurement System	AKMAL Muhammad	Graduate	PhD
Development Of A High Power RF Measurement System	RUSSAMEE Nilaped	Graduate	PhD
Characterisation of Gallium Nitride HFTEs using Non-Linear Measurement Systems	MCGOVERN Peter	Graduate	PhD
Development of Novel Design Methodologies for the Efficiency Enhancement of RF Power Amplifiers in Wireless Communications	WRIGHT Peter	Graduate	PhD
GaInP/InGaAs MODFET Fabrication and Characterisation	LOMAX Peter Anthony	Graduate	PhD
Intelligence Driven Load-Pull Measurement Strategies	SAINI Randeep	Graduate	PhD
DEVICE CHARACTERISATION FOR WIDEBAND, HIGH EFFICIENCY POWER AMPLIFIERS	WILSON Richard Jason	Current	PhD
Broadband Microwave Push-Pull Power Amplifiers	SMITH Robert	Graduate	PhD
On the Characterisation and Modelling of Silicon RF LDMOS Transistors	GADDI Roberto	Graduate	PhD
TELECOMMUNICATIONS WIDE AREA NETWORK PLANNING UTILISING MODERN HEURISTIC TECHNIQUES	ELHAGGAZ Salah	Graduate	PhD
On the Fractal Behaviour of Multimedia Network Traffic	MIAN Shahid	Graduate	PhD
Behavioral Model Analysis Of Active Harminic Load-Pull Measurements	WOODINGTON Simon	Graduate	PhD
THE USE OF CODED WAVEFORMS IN CONTINUOUS WAVE RADARS	HARMAN Stephen Anthony	Graduate	PhD
RAPID IDENTIFICATION OF BROADBAND AND EFFICIENT PA MODES.	SYED ANERA Syed Muhammad Hilmi Bin	Current	PhD
INVESTIGATIONS ON A MULTI-HARMONIC DPD SYSTEM FOR RF TRANSMITTERS IN MOBILE COMMUNICAITON SYSTEMS. SPECIALIZATION: ELECTRICAL ENGINEERING ( ELECTRONIC AND TELECOMMUNICATION).	HUSSEINI Thoalfukar H Abdalrida	Current	PhD
Continuous Mode High Efficiency Power Amplifier Design For X Band	CANNING Timothy	Graduate	PhD
A Large-Signal Multi-Tone Time Domain Waveform Measurement System With Broadband Active Load Impedance Control	WILLIAMS Tudor Vyvyan	Graduate	PhD
Novel Highly Efficient Broadband Continuous Power Amplifier Modes	CARRUBBA Vincenzo	Graduate	PhD
RF IV Waveform Engineering Applied to VSWR Sweeps and RF Stress Testing	MCGENN William	Graduate	PhD
Thin film packaging	ABOUSH Zaid Emmanuel	Graduate	PhD
DEVELOPMENT OF A BROADBAND AND EFFICIENT LINEAR TRANSMITTER	A MOKHTI Zulhazmi Bin	Current	PhD

Professional memberships

Distinguished Microwave Lecturer for IEEE MTT Chapter (2008-2010)
5 invited keynote papers associated with Asia-Pacific Microwave Conference, IEEE International Microwave Symposium and European Microwave Conference; invited industrial lectures at Freescale (USA)
Member of the IEEE MTT-14 Technical Sub-Committee (2003-) and IEEE MTT-20 IMS Technical Programme Sub-Committee (2007-)
External Reviewer for Finnish Academy of Sciences
Funded industrial collaborations: national (Filtronic, QinetiQ, LabTech, Milmega); international (Nokia, Freescale, Mimix Broadband, EADS Astrium)
Consultant to INPHI (USA) and Mimix Broadband (UK)

Contact Details

Tasker@cardiff.ac.uk
+44 29208 74423
Queen's Buildings - South Building, Room S/2.10A, 5 The Parade, Newport Road, Cardiff, CF24 3AA

Cardiff researchers to accelerate development of UK 6G networks

03 January 2023

Professor Paul Tasker
BSc, PhD, FIET, FIEEE FLSW

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Cardiff researchers to accelerate development of UK 6G networks

Professor Paul Tasker BSc, PhD, FIET, FIEEE FLSW

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Cardiff researchers to accelerate development of UK 6G networks

Professor Paul Tasker
BSc, PhD, FIET, FIEEE FLSW