Dr Jonny Lees

: Ar gael fel goruchwyliwr ôl-raddedig

Timau a rolau for Jonny Lees

Pennaeth Adran, Peirianneg Drydanol ac Electronig
Darllenydd
Yr Ysgol Peirianneg

Jonathan Lees became a chartered Engineer in 1999 and obtained MSc. and PhD. degrees from Cardiff University in 2002 and 2006 respectively. He is currently employed as a Lecturer in Non-Linear Microwave Characterisation within Cardiff University’s centre for High Frequency Engineering where his key research areas are linear-efficient PA design and characterisation with a specific interest in the design and optimisation of High-Efficiency Power Amplifiers. His work in this area culminated in the first published GaN Doherty amplifier, and his more recent activities consider the development of novel high-power, broad-band time-domain measurement and load-pull techniques that directly address the current and future needs of modern communication systems. Development of non-linear time-domain and load-pull microwave measurement systems. Current research activities include investigation into RF properties of materials, microwave heating and novel applications of microwave engineering.Electrical & Electronic Engineering
Health, Technology and the Digital World

Dr. Lees is currently the course Tutor for the MSc. in Wireless and Microwave Communications Engineering.

Date
Type

2024

Sadeque, M. G. et al., 2024. 3.3–4.3 GHz efficient continuous class-F gallium nitride power amplifier based on simplified real frequency technique and harmonic tuning. PLoS ONE 19 (8) e0306738. (10.1371/journal.pone.0306738)
Bogusz, A. et al. 2024. Design and characterization of an MMIC current mode outphasing power amplifier. Presented at: IEEE/MTT-S International Microwave Symposium Washington, DC, USA 16-21 June 2024. Proceedings of IEEE/MTT-S International Microwave Symposium. IEEE. , pp.580-583. (10.1109/IMS40175.2024.10600335)
Joshi, L. T. et al., 2024. Rapid, point-of-care microwave lysis and electrochemical detection of Clostridioides difficile directly from stool samples. Bioengineering 11 (6) 632. (10.3390/bioengineering11060632)

2023

Li, W. et al., 2023. Performance modeling and shaping function extraction for dual-input load modulated power amplifiers. Presented at: 2023 IEEE/MTT-S International Microwave Symposium - IMS 2023 San Diego, USA 11-16 June 2023. Proceedings of the 2023 IEEE/MTT-S International Microwave Symposium (IMS). IEEE. , pp.203-206. (10.1109/IMS37964.2023.10188039)
Twigg, J. A. et al. 2023. Compositional shifts within the denture-associated bacteriome in pneumonia – an analytical cross-sectional study. Journal of Medical Microbiology 72 (6)(10.1099/jmm.0.001702)

2022

Sadeque, M. G. et al., 2022. Design of wideband continuous class-f power amplifier using low pass matching technique and harmonic tuning network. IEEE Access 10 , pp.92571-92582. (10.1109/ACCESS.2022.3202886)

2021

Prior-Jones, M. et al. 2021. Cryoegg: development and field trials of a wireless subglacial probe for deep, fast-moving ice. Journal of Glaciology 67 (264), pp.627-640. (10.1017/jog.2021.16)

2020

Chen, P. et al. 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)
Alt, A. et al. 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 2020. 2020 International Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits (INMMiC). IEEE. , pp.1-3. (10.1109/INMMiC46721.2020.9160186)
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 2020. 2020 International Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits (INMMiC). IEEE. , pp.1-3. (10.1109/INMMiC46721.2020.9160347)
Chen, P. et al. 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 2020. 2020 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. 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)
Ahortor, E. K. et al. 2020. The biological effect of 2.45 GHz microwaves on the viability and permeability of bacterial and yeast cells. Journal of Applied Physics 127 (204902), pp.IMPORTED. (10.1063/1.5145009)
Prior-Jones, M. et al. 2020. Cryoegg: development and field trials of a wireless subglacial probe for deep, fast-moving ice. Presented at: EGU General Assembly 2020 Online 4-8 May 2020. Copernicus {GmbH}. (10.5194/egusphere-egu2020-10204)
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)
Eblabla, A. et al. 2020. Membrane supported GaN CPW structures for high-frequency and high-power applications. Presented at: 2019 IEEE Asia-Pacific Microwave Conference (APMC) Marina Bay Sands, Singapore 10-13 December 2019. 2019 IEEE Asia-Pacific Microwave Conference (APMC). IEEE. , pp.1179-1181. (10.1109/APMC46564.2019.9038731)

2019

Alsahali, S. et al. 2019. Supply modulator ripple in envelope tracking systems - effects and countermeasures. Presented at: 49th European Microwave Conference (EuMC 2019) Paris, France 01-03 October 2019. 2019 49th European Microwave Conference (EuMC). IEEE. , pp.710-713. (10.23919/EuMC.2019.8910890)
Alt, A. et al. 2019. Impact of the input impedance on the linearity of supply modulated GaN HEMT power amplifiers. Presented at: European Microwave Week 2019 (EuMW2019) Paris, France 29 September - 03 October 2019. 2019 49th European Microwave Conference (EuMC). IEEE. , pp.706-709. (10.23919/EuMC.2019.8910882)
Chaudhary, M. A. et al., 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 2017. Proceedings of 3rd International Conference on Circuits, Systems and Devices (ICCSD). IEEE. , pp.92. (10.1109/ICCSD.2019.8843202)
Bogusz, A. et al. 2019. Wideband compact planar balun for applications in outphasing and push-pull amplifiers. Electronics Letters 55 (16), pp.912-914. (10.1049/el.2018.7915)
Mokhti, Z. A. et al., 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)
Hamzah, H. et al. 2019. A compact microwave applicator for the rapid detection of clostridium difficile. Presented at: 2019 IEEE MTT-S International Microwave Biomedical Conference (IMBioC) Nanjing, China 6-8 May 2019. 2019 IEEE MTT-S International Microwave Biomedical Conference (IMBioC). IEEE. (10.1109/IMBIOC.2019.8777882)
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)
Eblabla, A. et al. 2019. Multi-channel AlGaN/GaN lateral schottky barrier diodes on low-resistivity silicon for sub-THz integrated circuits applications. IEEE Electron Device Letters 40 (6), pp.878-880. (10.1109/LED.2019.2912910)
Williams, C. F. et al. 2019. Bioluminescence of Vibrio fischeri: bacteria respond quickly and sensitively to pulsed microwave electric (but not magnetic) fields. Journal of Biomedical Optics 24 (5) 051412. (10.1117/1.JBO.24.5.051412)
Malyshev, D. et al. 2019. Model of microwave effects on bacterial spores. Journal of Applied Physics 125 (12) 124701. (10.1063/1.5085442)
Alt, A. et al. 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 2018. 2018 IEEE Wireless Power Transfer Conference (WPTC). IEEE(10.1109/WPT.2018.8639317)
Bogusz, A. et al. 2019. Design and characterisation of an outphasing power amplifier with balun combiner. Presented at: 2019 IEEE MTT-S International Microwave Conference on Hardware and Systems for 5G and Beyond (IMC-5G) Altanta, GA, USA 15-16 August 2019. 2019 IEEE MTT-S International Microwave Conference on Hardware and Systems for 5G and Beyond (IMC-5G). IEEE(10.1109/IMC-5G47857.2019.9160351)
Quaglia, R. and Lees, J. 2019. Simplified analysis of the effect of load variation in common Doherty power amplifier architectures. Presented at: 2019 IEEE Topical Conference on RF/Microwave Power Amplifiers for Radio and Wireless Applications (PAWR) Orlando, FL, USA 20-23 Jan 2019. IEEE Topical Conference on RF/Microwave Power Amplifiers for Radio and Wireless Applications (PAWR). IEEE

2018

Alt, A. et al. 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 2018. Proceedings of the 48th European Microwave Conference. Piscataway, NJ: IEEE. , pp.773-776. (10.23919/EuMC.2018.8541564)
Alt, A. et al. 2018. Comparing FET technologies in terms of their suitability for broadband envelope tracking power amplifiers. Presented at: InMMIC Brive La Gaillarde, France 5-6 July 2018. Proceedings of 2018 International Workshop on Integrated Nonlinear Microwave and Millimetre-wave Circuits. IEEE. , pp.1-3. (10.1109/INMMIC.2018.8430025)
Bogusz, A. et al. 2018. Power and efficiency continuous modes in saturated GaN HEMT devices. Presented at: Inmmic 2018 Brive-La-Gaillarde, France 5-6 July 2018. Proceedings of 2018 International Workshop on Integrated Nonlinear Microwave and Millimetre-wave Circuits. IEEE. , pp.8430020-8430020. (10.1109/INMMIC.2018.8430020)
Chen, P. et al. 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 2018. International Workshop on Integrated Nonlinear Microwave and Millimetre-wave Circuits (INMMIC). IEEE. (10.1109/INMMIC.2018.8429984)
Williams, C. et al. 2018. Real-time microscopic observation of biological interactions with microwave fields. Presented at: International Microwave Biomedical Conference (IMBioC) Philadelphia, USA 14-15 Jun 2018. International Microwave Biomedical Conference (IMBioC). IEEE. , pp.199. (10.1109/IMBIOC.2018.8428902)
Chaudhary, M. A. et al., 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 2018. 2018 5th International Conference on Electrical and Electronic Engineering (ICEEE). IEEE. , pp.219-223. (10.1109/ICEEE2.2018.8391334)
Hamzah, H. , Lees, J. and Porch, A. 2018. Split ring resonator with optimised sensitivity for microfluidic sensing. Sensors and Actuators A: Physical 276 , pp.1-10. (10.1016/j.sna.2018.03.023)
Hamzah, H. et al. 2018. A compact microwave microfluidic sensor using a re-entrant cavity. Sensors 18 (3) 910. (10.3390/s18030910)
Chaudhary, M. A. et al., 2018. Multitone measurement system for linearity investigations of microwave devices. Presented at: International Multi-Topic Conference (Inmic) Lahore, Pakistan 24-26 Nov 2017. International Multi-Topic Conference (Inmic). IEEE. (10.1109/INMIC.2017.8289455)

2017

Alt, A. and Lees, J. 2017. Improving efficiency, linearity and linearisability of an asymmetric doherty power amplifier by modulating the peaking amplifier’s supply voltage. Presented at: 20th EuMW 2017 Nuremberg, Germany 8-13 October 2017. 2017 47th European Microwave Conference (EuMC). IEEE. , pp.464-467. (10.23919/EuMC.2017.8230890)
Hefford, S. et al. 2017. Monitoring changes in microwave asorption of Ti64 powder during microwave sintering. Presented at: 2017 47th European Microwave Conference (EuMC) Nuremberg, Germany 10-12 October 2017. 2017 47th European Microwave Conference (EuMC). IEEE. , pp.927-929. (10.23919/EuMC.2017.8230997)
Zhou, H. et al., 2017. Power amplifier and antenna integration utilizing capacitively coupled feeding mechanism. Presented at: International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting San Diego, CA, USA 9-14 July 2017. 2017 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting. IEEE. , pp.2355-2356. (10.1109/APUSNCURSINRSM.2017.8073220)
Abduljabar, A. A. et al., 2017. Dual mode microwave microfluidic sensor for temperature variant liquid characterization. IEEE Transactions on Microwave Theory and Techniques 65 (7), pp.2572 - 2582. (10.1109/TMTT.2016.2647249)
Pal, A. et al., 2017. Co-design of an antenna-power amplifier RF front-end block without matching network for 2.4 GHz WiFi application. Presented at: 2017 IEEE Radio and Wireless Symposium (RWS) Phoenix, AZ, USA 15-18 January 2017. 2017 IEEE Radio and Wireless Symposium (RWS). IEEE. , pp.201-203. (10.1109/RWS.2017.7885987)
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 2016. IEEE International Conference on Electronic Information and Communication Technology (ICEICT). IEEE. , pp.512-514. (10.1109/ICEICT.2016.7879754)
Chaudhary, M. A. et al., 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 2016. 16th Mediterranean Microwave Symposium (MMS), 2016. IEEE. , pp.1. (10.1109/MMS.2016.7803811)

2016

Dong, S. et al., 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 2016. IEEE MTT-S International Wireless Symposium (IWS), 2016. IEEE. , pp.1. (10.1109/IEEE-IWS.2016.7585473)
Yusoff, Z. et al., 2016. The effect of tracking generator efficiency to overall RF power amplifier system efficiency. Presented at: 2016 IEEE International Conference on Semiconductor Electronics (ICSE) 17-19 August 2016. 2016 IEEE International Conference on Semiconductor Electronics (ICSE). IEEE. , pp.344-347. (10.1109/SMELEC.2016.7573662)
Williams, C. F. et al. 2016. What the deep sea can tell us about microwaves. Presented at: International Microwave Symposium IMS San Francisco, California 22-27 May 2016. Microwave Symposium (IMS), 2016 IEEE MTT-S International. IEEE(10.1109/MWSYM.2016.7540432)
Williams, C. F. et al. 2016. The separated electric and magnetic field responses of luminescent bacteria exposed to pulsed microwave irradiation. Applied Physics Letters 109 (9) 093701. (10.1063/1.4961970)
Chaudhary, M. A. et al., 2016. Modulated waveform measurement and engineering system. Presented at: 2015 2nd International Conference on Electronics and Communication Systems (ICECS) Cairo, Egypt 6-9 December 2015. 2015 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)
Yusoff, Z. et al., 2016. Ferrite toroidal core with a trifilar wound RF broadband transformer design for tracking generators in wideband code division multiple access envelope tracking RFPA systems. Journal of Electromagnetic Waves and Applications 30 (5), pp.599-611. (10.1080/09205071.2016.1138899)

2015

Imtiaz, A. et al. 2015. An integrated continuous class-F-1 mode power amplifier design approach for microwave enhanced portable diagnostic applications. IEEE Transactions on Microwave Theory and Techniques 63 (10), pp.3007-3015. (10.1109/TMTT.2015.2472417)
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. et al., 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)
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) 213502. (10.1063/1.4921848)
Imtiaz, A. et al. 2015. A high power high efficiency integrated solid-state microwave heating structure for portable diagnostic healthcare applications. Presented at: IEEE MTT-S 2014 IEEE International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications London 8-10 December 2014. 2014 IEEE MTT-S international microwave workshop series on RF and wireless technologies for biomedical and healthcare applications (IMWS-Bio). IEEE. , pp.1-3. (10.1109/IMWS-BIO.2014.7032437)

2014

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 2014. 44th European Microwave Conference (EuMC 2014). IEEE. , pp.1301-1304. (10.1109/EuMC.2014.6986682)
Hartley, J. et al. 2014. Assessment of machine oil quality by microwave cavity perturbation method. Presented at: 2014 International Symposium on Information Technology Convergence (ISITC 2014) Jeonju, Republic of Korea 30-31 October 2014.
Aldoumani, A. et al. 2014. Enhanced vector calibration of load-pull measurement systems. Presented at: 83rd ARFTG Microwave Measurement Conference 2014 Tampa, FL, USA 6 June 2014. ARFTG Microwave Measurement Conference (ARFTG), 2014 83rd. IEEE. , pp.1-4. (10.1109/ARFTG.2014.6899508)
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 2014. 83rd ARFTG Microwave Measurement Conference (ARFTG), 2014. , pp.1-4. (10.1109/ARFTG.2014.6899535)
Koh, M. et al., 2014. Frequency scalable large signal transistor behavioral model based on admittance domain formulation. Presented at: International Microwave Symposium Tampa, Florida 1-6 June 2014. 2014 IEEE MTT-S International Microwave Symposium (IMS). Picastaway, NJ: IEEE. , pp.1-3. (10.1109/MWSYM.2014.6848287)
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 2014. Teletraffic Congress (ITC), 2014 26th International. , pp.1-4. (10.1109/ITC.2014.6932967)
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 2014. European Microwave Integrated Circuit Conference (EuMIC), 2014 9th. IEEE. , pp.357-360. (10.1109/EuMIC.2014.6997866)
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 2014. European Microwave Conference (EuMC). Vol. 44.IEEE. , pp.1305-1308. (10.1109/EuMC.2014.6986683)
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 2014. Compound Semiconductor Integrated Circuit Symposium (CSICs), 2014 IEEE. IEEE. , pp.1-4. (10.1109/CSICS.2014.6978563)
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 2014. ARFTG Microwave Measurement Conference (ARFTG), 2014 83rd. IEEE. , pp.1-4. (10.1109/ARFTG.2014.6899507)
Yang, F. et al., 2014. Continuous class BJ power amplifier with DGS output matching. Presented at: 83rd ARFTG Microwave Measurement Conference 2014 Tampa, USA 6 June 2014. Microwave Symposium (IMS), 2014 IEEE MTT-S International. IEEE. , pp.1-4. (10.1109/MWSYM.2014.6848562)

2013

Aldoumani, A. et al. 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 2013. 2013 81st ARFTG Microwave Measurement Conference (ARFTG). Picastaway, NJ: IEEE. , pp.1-4. (10.1109/ARFTG.2013.6579055)
Chaudhary, M. A. et al., 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 2013. Multi Topic Conference (INMIC), 2013 16th International. IEEE. , pp.106-109. (10.1109/INMIC.2013.6731333)
Chaudhary, M. A. et al., 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 2013. Wireless Symposium (IWS), 2013 IEEE International. IEEE. , pp.1-4. (10.1109/IEEE-IWS.2013.6616709)
Featherston, C. et al. 2013. An autonomous structural health monitoring solution. Presented at: Microtechnologies 2013 Grenoble, France 24-26 April 2013. Proc. SPIE 8763, Smart Sensors, Actuators, and MEMS VI. Society of Photo-Optical Instrumentation Engineers (SPIE). , pp.876302. (10.1117/12.2018401)
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 2013. Power Amplifiers for Wireless and Radio Applications (PAWR), 2013 IEEE Topical Conference on. IEEE. , pp.4-6. (10.1109/PAWR.2013.6490170)
Koh, M. et al., 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 2013. 2013 IEEE MTT-S International Microwave Symposium Digest (IMS). Picastaway, NJ: IEEE. , pp.1-4. (10.1109/MWSYM.2013.6697424)
Kural, A. et al. 2013. Design and characterization of an ultrasonic lamb-wave power delivery system. IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control 60 (6), pp.1134-1140. (10.1109/TUFFC.2013.2676)
Morgan, A. J. et al. 2013. Efficient microwave heating of microfluidic systems. Sensors and Actuators B: Chemical 181 , pp.904-909. (10.1016/j.snb.2013.02.099)
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 2013. Proceedings of the 43rd European Microwave Conference. , pp.684-687.
Pearson, M. et al. 2013. 9th international conference on advances in experimental mechanics. Presented at: 9th International Conference on Advances in Experimental Mechanics Cardiff, Wales 3 - 5 September 2013.
Schmid, U. et al., 2013. Hybrid energy storage system for wireless sensor node powered by aircraft specific thermoelectric energy harvesting. Presented at: Smart Sensors, Actuators, and MEMS VI Grenoble, France 24 April 2013. Proc. SPIE 8763, Smart Sensors, Actuators, and MEMS VI. Vol. 8763.SPIE. , pp.876307. (10.1117/12.2017691)
Thangaraj, K. et al. 2013. Energy storage options for wireless sensors powered by aircraft specific thermoelectric energy harvester. Microsystem Technologies 20 (4-5), pp.701-707. (10.1007/s00542-013-2009-3)
Yusoff, Z. et al., 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)

2012

Akmal, M. et al. 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 2012. 7th European Microwave Integrated Circuits Conference (EuMIC), 2012. Picastaway, NJ: IEEE. , pp.885-888.
Arnold, M. et al., 2012. Energy management systems for energy harvesting in structural health monitoring applications. Key Engineering Materials 518 , pp.137-153. (10.4028/www.scientific.net/KEM.518.137)
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 2012. 7th European Microwave Integrated Circuits Conference (EuMIC), 2012. Picastaway, NJ: IEEE. , pp.480-483.
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 2012. Microwave Symposium Digest (MTT), 2012 IEEE MTT-S International. IEEE. , pp.1-3. (10.1109/MWSYM.2012.6258343)
Carrubba, V. et al. 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. et al. 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 2012. Microwave Symposium Digest (MTT), 2012 IEEE MTT-S International. IEEE. , pp.1-3. (10.1109/MWSYM.2012.6259725)
Mimis, K. et al., 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 2012. Microwave Symposium Digest (MTT), 2012 IEEE MTT-S International. , pp.1-3. (10.1109/MWSYM.2012.6259543)
Pullin, R. et al. 2012. On the Development of a Damage Detection System using Macro-fibre Composite Sensors. Journal of Physics. Conference Series 382 (1) 012049. (10.1088/1742-6596/382/1/012049)
Smith, R. M. et al., 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 2012. Microwave Symposium Digest (MTT), 2012 IEEE MTT-S International. IEEE. , pp.1-3. (10.1109/MWSYM.2012.6259418)
Smith, R. M. et al. 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. et al. 2012. Wideband PA design: The "continuous" mode of operation. Presented at: Compound Semiconductor Integrated Circuit Symposium (CSICS) La Jolla, CA, USA 14-17 October 2012. Compound Semiconductor Integrated Circuit Symposium (CSICS), 2012 IEEE. IEEE. , pp.1-4. (10.1109/CSICS.2012.6340048)

2011

Carrubba, V. et al. 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)
Carrubba, V. et al. 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 2011. 2011 IEEE/MTT-S International Microwave Symposium - MTT 2011. New York: IEEE. , pp.350-353. (10.1109/MWSYM.2011.5972701)
Yusoff, Z. B. et al. 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 2011. 2011 Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits (INMMIC 2011). New York: IEEE. , pp.109-112. (10.1109/INMMIC.2011.5773334)
Yusoff, Z. B. et al. 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. Published in: Seigel, P. et al., 2011 IEEE/MTT-S International Microwave Symposium - MTT 2011. New York: IEEE. , pp.1752-1755. (10.1109/MWSYM.2011.5972769)
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. Published in: Seigel, P. et al., 2011 IEEE/MTT-S International Microwave Symposium - MTT 2011. New York: IEEE. , pp.1747-1750. (10.1109/MWSYM.2011.5972833)
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 2011. Microwave Integrated Circuits Conference (EuMIC), 2011 European. IEEE. , pp.180-183.
Almuhaisen, A. et al. 2011. Wide band high-efficiency power amplifier design. Presented at: 6th European Microwave Integrated Circuits Conference (EuMIC) 2011 Manchester, UK 10-11 October 2011. Proceedings of the 6th European Microwave Integrated Circuits Conference (EuMIC). Los Alamitos, CA: IEEE. , pp.184-187.
Bell, J. J. et al. 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 2011. Microwave Symposium Digest (MTT), 2011 IEEE MTT-S International. New York: IEEE. , pp.982-986. (10.1109/MWSYM.2011.5972803)
Canning, T. A. J. et al. 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 2011. Proceedings of the 2011 78th ARFTG Microwave Measurement Symposium (ARFTG) - High Power RF Measurement Techniques. Los Alamitos, CA: IEEE(10.1109/ARFTG78.2011.6183864)
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 2011. Proceedings of the 41st European Microwave Conference (EuMC). IEEE. , pp.333-336.
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 2011. Design and Measurement of Microwave Systems - Proceedings of the 2011 77th ARFTG Microwave Measurement Conference (ARFTG). Los Alamitos, CA: IEEE(10.1109/ARFTG77.2011.6034553)
FitzPatrick, D. et al., 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 2011. 2011 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)
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 2011. Proceedings of the 6th European Microwave Integrated Circuits Conference (EuMIC). Los Alamitos, CA: IEEE. , pp.296-299.
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 2011. Proceedings of the 6th European Microwave Integrated Circuits Conference (EuMIC). Los Alamitos, CA: IEEE. , pp.152-155.
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 2011. Design and Measurement of Microwave Systems - Proceedings of the 2011 77th ARFTG Microwave Measurement Conference (ARFTG). Los Alamitos, CA: IEEE(10.1109/ARFTG77.2011.6034552)
Saini, R. et al. 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 2011. Proceedings of the 2011 78th ARFTG Microwave Measurement Symposium (ARFTG) - High Power RF Measurement Techniques. Los Alamitos, CA: IEEE(10.1109/ARFTG78.2011.6183865)
Smith, R. M. et al. 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. Published in: Seigel, P. et al., 2011 IEEE/MTT-S International Microwave Symposium - MTT 2011. New York: IEEE. , pp.1204-1208. (10.1109/MWSYM.2011.5972702)

2010

Clarke, A. L. et al. 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 2010. 2010 IEEE MTT-S International Microwave Symposium Digest (MTT 2010). New York: IEEE. , pp.1114-1117. (10.1109/MWSYM.2010.5517222)
Akmal, M. et al., 2010. The effect of baseband impedance termination on the linearity of GaN HEMTs. Presented at: European Microwave Conference 2010 Paris, FranceVol. 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, SwedenVol. 548011. , pp.148-151.
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 2010. 2010 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.
Almuhaisen, A. et al. 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 2010. 2010 IEEE MTT-S International Microwave Symposium Digest (MTT 2010). New York: IEEE. , pp.664-667. (10.1109/MWSYM.2010.5514759)
Bensmida, S. et al., 2010. Generic pre-distortion of a Class-J Power amplifier. Presented at: European Microwave Conference 2010 Paris, FranceVol. 561648. , pp.1022-1025.
Carrubba, V. et al., 2010. The continuous Class-F Mode mode power amplifier. Presented at: European Microwave Conference (EuMC) 2010 Paris, FranceVol. 561630. , pp.1674-1677.
FitzPatrick, D. M. et al., 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 2010. Proceedings 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)
Hashmi, M. S. et al. 2010. Agile harmonic envelope load-pull system enabling reliable and rapid device characterization. Measurement Science and Technology 21 (5) 055109. (10.1088/0957-0233/21/5/055109)
Hashmi, M. S. et al. 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)
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)
Naylon, A. J. et al. 2010. Efficient Microwave heating and dielectric characterization of microfluidic systems. Presented at: Proceedings of MicroTAS 2010 Groningen, The Netherlands, pp.2092-2094.
Saini, R. et al. 2010. An intelligence driven active loadpull system. Presented at: 75th ARFTG Microwave Measurement Conference: Measurement of Modulated Signals for Communications Anaheim, USAVol. 549632.
Woodington, S. P. et al. 2010. Behavioral model analysis of active harmonic load-pull measurements. Presented at: IEEE MTT-S International Microwave Symposium Anaheim, CA, USA 23-28 May 2010. Microwave Symposium Digest (MTT), 2010 IEEE MTT-S International. New York: IEEE. , pp.1688-1691. (10.1109/MWSYM.2010.5517261)

2009

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 2009. European Microwave Week 2009 - "Science, Progress and Quality at Radiofrequencies": Conference Proceedings. London: Horizon House Publications. , pp.1433-1436.
Cripps, S. C. et al. 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)
Fitzpatrick, D. M. et al. 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 2009. European Microwave Week 2009 - "Science, Progress and Quality at Radiofrequencies": Conference Proceedings. London: Horizon House Publications. , pp.1445-1448.
Hashmi, M. S. et al., 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.
Sheikh, A. et al., 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 2008. Proceedings of the 38th European Microwave Conference, 2008 (EuMC 2008). Los Alamitos, CA: IEEE. , pp.1671-1674. (10.1109/EUMC.2008.4751795)
Wright, P. et al., 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)
Wright, P. T. et al. 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 2009. IEEE MTT-S International Microwave Symposium Digest, 2009. MTT '09. Los Alamitos, CA: IEEE. , pp.653-656. (10.1109/MWSYM.2009.5165781)

2008

Alghanim, A. et al., 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)
Alghanim, A. et al., 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)
FitzPatrick, D. M. et al., 2008. Large signal device characterisation using active load-pull for improved MMIC design. Presented at: IET Seminar on RF and Microwave IC Design London, UKIET. , pp.1-7.
Lees, J. et al. 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)
Williams, T. et al., 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. et al. 2008. GaN power transistors in narrow and wide bandwidth applications. Presented at: IET Seminar on Wideband Receivers and Components London, UK, pp.1.

2007

Alghanim, A. et al., 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)
Alghanim, A. et al., 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, ThailandIEEE. , pp.1-4. (10.1109/APMC.2007.4554737)
Sheikh, A. et al., 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)

2006

Aubrey, A. J. et al., 2006. Using the bi-modality of speech for convolutive frequency domain blind source separation. Presented at: Proceedings of IMA 7th International Conference on Mathematics in Signal Processing Cirencester, UK
Lees, J. 2006. Doherty amplifier structures for modern microwave communication systems. PhD Thesis , Cardiff University.
Lees, J. et al. 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.
Mayer, M. et al., 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.

2005

Aboush, Z. et al. 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)
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, FranceVol. 1., pp.609-612. (10.1109/EUMC.2005.1608930)
Lees, J. et al. 2005. A comparison of load-pull measurement results of a 4W Phemt involving five European laboratories. Presented at: European Gallium Arsenide and Other Semiconductor Application Symposium Paris, France 3-4 October, 2005. Proceedings of the European Gallium Arsenide and Other Semiconductor Application Symposium Paris, France,3-4 October, 2005. IEEE. , pp.321-324.
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 2005. 35th European Microwave Conference: conference proceedings. Horizon House
Lees, J. et al. 2005. Experimental gallium nitride microwave Doherty amplifier. IEEE Electronic Letters 41 (23), pp.1284-1285. (10.1049/el:20053155)

2004

Lees, J. et al. 2004. An automated multi-stimulus measurement system for characterising multi-device amplifiers. Presented at: 34th European Microwave Conference Amsterdam, The NetherlandsVol. Nov-15., pp.435-438.

2003

Lees, J. et al. 2003. Single-tone optimisation of an adaptive-bias Doherty structure. Presented at: Microwave Symposium Digest, IEEE MTT-S International Philadelphia, USA 8-13 June 2003. Microwave Symposium Digest, IEEE MTT-S International. Vol. 3.IEEE. , pp.2213-2216. (10.1109/MWSYM.2003.1210604)

Rwy'n perthyn i'r Ganolfan Peirianneg Amledd Uchel (CHFE), grŵp ymchwil sydd wedi canolbwyntio'n draddodiadol ac yn llwyddiannus ei weithgareddau ymchwil ar systemau cyfathrebu microdon masnachol, cymwysiadau lled-ddargludyddion cyfansawdd ac, yn fwy diweddar, strwythurau cyseiniant ar gyfer synhwyro ac aflonyddu.

Electroneg lled-ddargludyddion cyfansawdd - Ar hyn o bryd mae'r CHFE yn arwain nifer o brosiectau ymchwil arloesol; consortiwm a ariennir gan EPSRC, sy'n cynnwys nifer o bartneriaid academaidd, datblygu modiwlau RF olrhain amlen lled band uchel (ET) effeithlonrwydd uchel ar gyfer systemau cyfathrebu 5G, sy'n gofyn am integreiddio electroneg RF a baseband yn agos, gan ddefnyddio'r un dechnoleg ddyfais ddelfrydol ar yr un swbstrad GaN-on-silicon. Arweiniodd y CHFE hefyd brosiect cadwyn Gyflenwi RF-GaN mawr, GaNforCS, a ariannwyd gan ERDF drwy Lywodraeth Cymru. Roedd y prosiect yn cynnwys 10 partner diwydiannol, gan drosglwyddo dealltwriaeth a gwybodaeth ymchwil i brosesau diwydiannol ar gyfer cynhyrchu cyfaint, gan alluogi ffynhonnell y DU o ddyfeisiau RF-GaN ar gyfer cymwysiadau cyfathrebu, diogelwch a gofal iechyd.

Gwresogi a tharfu microdon cyflwr solet - Mae Prifysgol Caerdydd yn aelod o'r gynghrair ynni amledd radio (RFEA), consortiwm Ewropeaidd sy'n hyrwyddo'r defnydd o dechnoleg lled-ddargludyddion cyflwr solet ar gyfer cymwysiadau gwresogi a tharfu domestig a diwydiannol y farchnad dorfol. Mae ymchwil gyfredol yn archwilio'r syniad o wresogi cyflwr solet aml-fwydo ar gyfer halltu cyfansoddion â chymorth microdon. Mae manteision sylweddol sy'n gysylltiedig â'r union reolaeth y gellir ei chyflawni trwy wresogi microdon cyflwr cadarn o'i gymharu â'r dulliau traddodiadol, magnetron sy'n seiliedig ac awtoclaf.

Systemau cymorth microdon ar gyfer gofal iechyd - Rwyf wedi bod yn ymwneud â nifer o brosiectau ymchwil cydweithredol gyda'r Ysgolion Deintyddiaeth a fferylliaeth, gan edrych ar ffyrdd y gallwn ddefnyddio maes trydanol microdon gymhwysol i a) atal ffurfio a thwf bioffilmiau gwrth-ficrobaidd, a b) amharu ar gelloedd bacteriol a sborau i ddatgelu DNA ar gyfer gwella canfod desiese gwrthsefyll gwrthficrobal yn gyflym. Un enghraifft sy'n arbennig o bwysig o ran ei effaith bosibl, yw prosiect y Phoenix yn brosiect porth prifysgol yng Nghaerdydd lle mae'r brifysgol yn gweithio gyda chydweithwyr yn Namibia i fynd i'r afael â rhai o'r prif broblemau gofal iechyd y mae'r wlad yn eu hwynebu ar hyn o bryd. Pryder arbennig yw lledaeniad twbercwlosis sy'n gwrthsefyll gwrthfiotigau gyda dros 200,000 o achosion gweithredol ar unrhyw un adeg. Mae trin y clefyd yn arbennig o heriol gan nad oes gan y dulliau diagnostig presennol sensitifrwydd a chyflymder ac mae angen mynediad at seilwaith fel prif gyflenwad trydan. O gofio bod llawer o'r unigolion yr effeithir arnynt yn byw ffordd o fyw ffordd grwydrol, mewn ardaloedd anghysbell o ganolfannau poblogaeth mawr, mae mynediad amserol at ofal iechyd yn her.

Mewn cydweithrediad ar y cyd, mae ysgolion Peirianneg a Fferylliaeth yn datblygu dull gofal amser real sy'n seiliedig ar ficrodon sy'n gallu canfod amrywiaeth o bathogenau, gan gynnwys twbercwlosis, o fewn amserlen sy'n caniatáu i'r claf gael diagnosis a thriniaeth briodol yn ystod yr un ymweliad gofal iechyd. Er mwyn datblygu'r gallu hwn, ein nod yw mynd i'r afael â thair her dechnegol gysylltiedig;

Datblygu system cipio ynni syml a chadarn sy'n gallu cefnogi gweithrediad yr assay mewn ardaloedd yn Namibia o bell o bŵer prif gyflenwad
System ymyrraeth microdon pŵer isel sy'n gallu cyfryngu rhyddhau DNA targed o ystod o samplau clinigol.
Dull llif unffordd syml i'w ddarllen, pathogen-benodol

Mae'r platfform tarfu microdon yn seiliedig ar electroneg microdon solet-wladwriaeth a cheudodau microdon cyseiniant un-modd bach sy'n canolbwyntio maes trydanol pwls o fewn sampl sy'n cynnwys bacteria planctonig neu sborau bacteriol, er mwyn lysio celloedd a rhyddhau DNA targed.

Mae'r defnydd o electroneg microdon cyflwr solid yn allweddol i lwyddiant y prosiect hwn, ac yn bwysig yn caniatáu ystyried datrysiadau batri ac ynni adnewyddadwy foltedd isel, sy'n addas ar gyfer defnyddio caeau o bell.

Mae'r caledwedd microdon yn cael ei optimeiddio'n barhaus, ac mae ymchwil ddiweddar a gynhaliwyd yn Ysgol Peirianneg Caerdydd wedi dangos ei bod yn bosibl lleihau maint, pwysau ac, yn bwysig, y lefelau pŵer microdon gofynnol yn ddramatig, fel bod y gofyniad pŵer ar gyfer echdynnu DNA bellach yn debyg i'r hyn a ddarperir gan ffôn symudol.

Mae'r datblygiadau hyn, ynghyd â'r technegau dylunio mwyhadur microdon effeithlonrwydd uchel a arloeswyd ym Mhrifysgol Caerdydd, bellach yn darparu'r posibilrwydd gwirioneddol y gallai'r offeryn diagnostig a ragwelir gael ei bweru'n lleol gan ddefnyddio generaduron solar neu syml â llaw.

Fel rhan o'r gwaith parhaus hwn, ac yn ychwanegol at yr elfennau microdon, byddwn yn anelu at ddatblygu system storio a chynhyrchu ynni syml, symudol, trydanol sy'n gallu bywiogi'r system ddiagnostig yn gyflym. Byddwn wedyn yn ceisio defnyddio'r system gyfun i Namibia ac mewn partneriaeth byddwn yn cydweithwyr o Ysgol Meddygaeth Prifysgol Namibia, yn pennu gallu'r system i ganfod TB yn y maes.

Contractau Ymchwil

Teitl	Pobl	yn Noddi	Hyd Gwerth
GaNforCS – Gallium Nitraride ar gyfer Cyfathrebu a Diogelwch	Lees J, Elgaid K, Tasker P	WEFO-ERDF	£2.8M	01/01/2020 - 30/08/2022
Dyfeisiau tonnau milimetr aflinol (signal mawr), cylchedau a systemau ar gyfleuster nodweddu dŵr	PJ Tasker, R Quaglia, K Elgaid, J Bell, S Cripps, J Benedikt, J Lees	EPSRC	£1.5M	01/10/2018 - 01/09/2019
mm-tonnau amplifiers pŵer ar gyfer araeau antena gweithredol	Quaglia R, Lees J, Cripps C	Huawei	£73k	01/11/2018 - 01/11/2019
Datblygu rheoli a storio pŵer a chanfod effeithlon a throsglwyddo di-wifr ar gyfer systemau SHM	Featherston C, Lees J, Pullin R	EADS	£200k	01/10/2011 - 30/09/2014
SENors i Hysbysu a Galluogi NeTworks di-wifr	Featherston C, Pullin R, Lees J, Holford K	TSB drwy HW Communications	£143k	01/01/2014 - 31/12/2016
Montagu	Featherston C, Pullin R, Lees J, Holford K	TSB - Innovate UK	£114k	01/05/2015 - 31/10/2017
Dyfais hunan-bwerus ar gyfer monitro iechyd strwythurol diwifr (SANDWICH)	Featherston C, Pullin R, Lees J, Holford, K	TSB	£40k	01/05/2013 - 31/10/2016
RF Power Amplifiers yn seiliedig ar dechnoleg BiCMOS Silicon-Germanium (SiGe) (efrydiaeth)	Tasker P, Lees J	SiGe Semiconductor (Europe) Ltd	£30k	01/10/2010 - 31/03/2014
Cynlluniau llinellol Baseband ar gyfer chwyddseinyddion pŵer effeithlonrwydd uchel	Tasker P, Lees J	Infinion Technologies North America Corp	£35k	01/01/2015 - 31/12/2017
byfferau perfformiad uchel ar gyfer electroneg RF GaN	Tasker P, Lees J	EPSRC	£250k	01/10/2016 - 31/03/2020
DI aml-ddull - ADC	Belcher R, Lees J, Naylon A	SELEX Galileo	£100k	01/10/2011 - 31/01/2013
Nodweddu dyfais effeithlonrwydd uchel ar gyfer OperaNET	Benedikt J, Lees J	Lled-ddargludyddion Freescale	50000	01/10/2008 - 30/09/2011
Uwchraddio'r sylfaen offer bach ar gyfer ymchwilwyr gyrfa gynnar yn y Gwyddorau Peirianneg a Ffisegol	Holford K, Whatling G, Lees J, Anderson P I, Brousseau E, Cipcigan L M, Pullin R, Bigot S, Theobald P, Simpson R N, Kawashita L F, Clarke A	EPSRC	498326	01/11/2012 - 31/03/2013
Nodweddu Capacitor BST	Lees J	DYFEISIAU ANALOG	3500	10/12/2012 - 09/01/2013
Curing Cyfansawdd Effeithlon trwy Brosesu Microdon Deallus	Lees J, Evans SL, Porch A, Eaton M	Canolfan EPSRC ar gyfer Gweithgynhyrchu Arloesol mewn Cyfansoddion - CIMComp, trwy Nottingham	49069	01/05/2015 - 31/10/2015
Datblygu celloedd llwyth ymreolaethol trwy ddatblygu electroneg rheoli pŵer, technolegau cyfathrebu diwifr a chynaeafu ynni ar gyfer ystod eang o gymwysiadau monitro	Lees J, Pullin R, Featherston C, Eaton M	KTP a Flintec	122570	01/10/2013 - 30/09/2015
Datblygu a gwireddu chwyddseinyddion pŵer newydd, band eang, effeithlonrwydd uchel (efrydiaeth)	Lees J, Tasker P	Lled-ddargludyddion Freescale France SAS	50000	01/01/2012 - 31/12/2014
Perfformiad Uchel mwyhadur pŵer ar gyfer radar arae fesul cam a cheisiadau cyfathrebu pwynt i bwynt	Lees J, Tasker P	M / A COM Technology Solutions (UK) Ltd	45000	01/10/2011 - 30/09/2014
Integreiddio Mwyhadur Pŵer Perfformiad Uchel gyda Antena Wideband Miniturized ar gyfer Dyfeisiau Cyfathrebu Uchel Effeithlon yn y Dyfodol	Lees J, Tasker P, Cripps S	Ser Cymru NRN AEM Abertawe	59350	01/10/2014 - 30/09/2017
Datblygu a gwireddu chwyddseinyddion pŵer effeithlonrwydd uchel band eang newydd	Tasker P, Lees J	Lled-ddargludyddion Freescale France SAS	50000	01/10/2012 - 30/09/2015
Electroneg GaN: Dibynadwyedd RF a mecanweithiau tradio	Tasker P, Lees J	EPSRC	222392	01/01/2013 - 31/12/2015
Integreiddio cylchedau RF gyda Cyflymder Uchel GaN Newid ar Swbstradau Silicon	Tasker P, Lees J, Benedikt J	EPSRC	835074	01/04/2016 - 31/03/2019
Nodweddu a chymharu dyfeisio GaN wedi'i becynnu	Tasker PJ, Benedikt J, Lees J,	Cree Inc	16931	01/05/2008 - 01/09/2008
Nodweddu a modelu deinamig HEMTs RF GaN	Tasker PJ, Lees J	Ser Cymru NRN AEM Abertawe	81300	01/10/2014 - 30/09/2017
Datblygu system ddiagnostig gyflym iawn sy'n gallu canfod presenoldeb C. difficile mewn sampl glinigol wrth ochr y gwely mewn llai na 10 munud	Baillie L (PHRMY), Lees J, Porch A	Cronfa Partneriaeth Caerdydd	12022	01/09/2014 - 31/08/2015
Gwresogi microdon glân a gwyrdd gan ddefnyddio ffiseg cyflwr solet	Cripps, S, Porch A, Lees J	NXP lled-ddargludyddion Iseldiroedd B V	30000	01/10/2011 - 30/09/2014

Deuthum yn Gymrawd yr Academi Addysg Uwch yn 2014.

Ar hyn o bryd mae fy addysgu yn rhychwantu pob blwyddyn o raglenni israddedig ac ôl-raddedig a addysgir mewn Peirianneg Drydanol ac Electronig, yn ogystal ag amryw raglenni cyn-sesiwn ac allgymorth.

Rwy'n arwain pedwar modiwl MSc / MEng; Prosiect Ymchwil, HF-RF Peirianneg, CAD Uwch, Ffugio a Phrofi, Dylunio RF a CAD, yn ogystal â modiwl blwyddyn gyntaf; Cyfathrebu analog.

Mae rolau diweddar a chyfredol eraill yn cynnwys:

Tiwtor Blwyddyn 4 – MEng Peirianneg Integredig ac Electronig (cyfredol)

Tiwtor Blwyddyn 1 – Peirianneg Integredig ac Electronig

MSc Tiwtor - Peirianneg Cyfathrebu Di-wifr a Microdon (gan gynnwys amrywiadau – MRes a chynlluniau 2 flynedd)

MSc Tiwtor – Technoleg Cyfathrebu ac Entrepreneuriaeth

MSc Tiwtor – Electroneg Lled-ddargludyddion Cyfansawdd

Dechreuais fy ngyrfa ym 1998 gan ddatblygu datrysiadau olrhain lleoli optegol a GPS gyda QinetiQ, U.K. a daeth yn Beiriannydd Siartredig ym 1999. Derbyniais fy ngraddau MSc. a PhD. o Brifysgol Caerdydd yn 2002 a 2006 yn y drefn honno ac ymunais â'r Ganolfan Peirianneg Amledd Uchel (CHFE) fel Cydymaith Ymchwil ym mis Mehefin 2005. Deuthum yn Ddarlithydd yn 2011 ac yna yn 2016, Uwch Ddarlithydd mewn Nodweddu Microdon Aflinol. Rhwng 2009 a 2010, cefais fy secondio i Mesuro fel Uwch Beiriannydd Caledwedd.

Mae fy rolau academaidd presennol yn cynnwys Pennaeth yr Adran Peirianneg Drydanol ac Electronig, yn ogystal â Thiwtor MEng Blwyddyn 4. Mae ei rolau blaenorol yn cynnwys Cyfarwyddwr Rhaglenni Ôl-raddedig a Addysgir ar gyfer Peirianneg, Tiwtor Blwyddyn 1 ar gyfer Peirianneg Integredig a Thrydanol ac Electronig a Chyfarwyddwr MSc Peirianneg Cyfathrebu Di-wifr a Microdon a'i amrywiadau.

Fy ffocws ymchwil yw datblygu galluoedd mesur a nodweddu microdon aflinol, chwyddseinyddion microdon perfformiad uchel, yn ogystal ag astudio dyfeisiau anllinellol a llinol gan ddefnyddio technegau parth amser ac amlen fodiwlaidd. Daeth fy ngwaith yn y maes hwn i ben gyda'r mwyhadur GaN Doherty a gyhoeddwyd gyntaf, ac mae gweithgareddau mwy diweddar yn ystyried datblygu technegau mesur parth amser a thynnu llwyth newydd pŵer uchel, band eang yn ogystal â thechnegau modiwleiddio cyflenwad deinamig wrth gyflawni effeithlonrwydd uchel a llinoledd uchel mewn mwyhaduron pŵer microdon. Dros y blynyddoedd diwethaf rwyf wedi cymhwyso fy arbenigedd microdon i gymwysiadau meddygol ac eraill, gan gynnwys dylunio mwyhadur pŵer microdon integredig iawn ar gyfer cymwysiadau diagnostig, a chynhyrchu a defnyddio ynni microdon pwls pŵer uchel ar gyfer canfod clostridium difficile.

Ar hyn o bryd rwy'n goruchwylio / goruchwylio dros 10 o fyfyrwyr PhD mewn Peirianneg Microdon a meysydd cysylltiedig. Cynrychiolais Brifysgol Caerdydd (aelod sefydlol) yn rhaglen OperaNET-2 EUREKA Ewropeaidd sy'n lleihau'r defnydd o bŵer mewn rhwydweithiau systemau cyfathrebu symudol.

Anrhydeddau a dyfarniadau

Ym mis Mehefin 2018 dyfarnwyd gwobr Arloesi Busnes Prifysgol Caerdydd i mi am waith gyda chwmni lleol sy'n datblygu celloedd llwyth ymreolaethol pŵer isel.

Gwobr Athro EEE y Flwyddyn – EN3082/782 – 2016/17

Diddordebau Ymchwil Cyfredol

Mae gen i ddiddordeb mewn goruchwylio myfyrwyr PhD ym meysydd

Effeithlonrwydd uchel Power Mwyhadur Dylunio
mm-tonnau pŵer mwyhadur dylunio
Technegau dylunio cylched microdon a thonnau mm
Cymwysiadau meddygol peirianneg microdon
Nodweddu microdon a thonnau mm

Myfyrwyr cyfredol

Teitl

Gradd	Statws		Myfyriwr
Nodweddu lefel dyfais o fwyhaduron pŵer all-raddol	Aleksander Bogusz	Cerrynt	Phd
Amlen Integredig Olrhain Power Amplifiers ar gyfer cyfathrebu 5G	Alexander Alt	Cerrynt	Phd
Modelu Anllinellol Seiliedig ar Fesur ar gyfer Dyfeisiau Gweithredol	Zack Costello	Cerrynt	Phd
Integreiddio Amplifiers Power Perfformiad Uchel gyda Antenâu Wideband Miniaturised ar gyfer Dyfeisiau Cyfathrebu Uchel Effeithlon yn y Dyfodol	Elango Nagasundaram	Cerrynt	Phd

Goruchwyliaeth gyfredol

Seyed Ghozati

Tîm o gyn-fyfyrwyr yn gorffen yn yr 16 uchaf ar ôl cyflwyno system dal carbon mewn manylder dros dri diwrnod ym mhrifddinas Gwlad Thai

Contact Details

[email protected]
+44 29208 74318

Dr Jonny Lees

Timau a rolau for Jonny Lees

Pennaeth Adran, Peirianneg Drydanol ac Electronig Darllenydd

Trosolwyg

Cyhoeddiad