![Roberto Quaglia](https://profiles-cardiff.imgix.net/attachments/3922?w=200&h=200&auto=format&crop=faces&fit=crop&q=90")
Dr Roberto Quaglia
Senior Lecturer - Teaching and Research
- Available for postgraduate supervision
Overview
I am a Senior Lecturer in the School of Engineering. My research focusses on high frequency power amplifiers
I am the Research Group Leader of the Centre for High Frequency Engineering:
https://www.cardiff.ac.uk/research/explore/research-units/centre-for-high-frequency-engineering
I have published around 130 peer-reviewed scientific papers, of which more than 45 on international journals. I am co-author of the books "Electronics for Microwave Backhaul" and "Telecommunication Electronics" published by Artech House.
I am Year Tutor for the MSc courses related to Microwave and Wireless technologies and Compound Semiconductor Electronics.
I teach master-level modules on advanced microwave techniques, and undergraduate modules on Analogue and Digital Electronics.
Publication
2024
- Powell, A. G., Quaglia, R., Powell, J. and Cripps, S. C. 2024. Efficient output power configuration in a K-Band power amplifier using a split-gate layout. Presented at: 19th European Microwave Integrated Circuits Conference (EuMIC), Paris, France, 23-24 September 20242024 19th European Microwave Integrated Circuits Conference (EuMIC). IEEE pp. 275-278., (10.23919/eumic61603.2024.10732591)
- Azad, E. M., Chaudhry, K. A., Gannicliffe, J. and Quaglia, R. 2024. Design and experimental characterization of an asymmetric GaN MMIC Doherty power amplifier for Ka-Band transmitters. Presented at: 19th European Microwave Integrated Circuits Conference (EuMIC), Paris, France, 23-24 September 20242024 19th European Microwave Integrated Circuits Conference (EuMIC). IEEE pp. 158-161., (10.23919/eumic61603.2024.10732357)
- Piacibello, A., Figueiredo, R., Quaglia, R., Giofre, R., Colantonio, P., Borges Carvalho, N. and Camarchia, V. 2024. Design and extensive NPR characterization of a highly-linear SatCom GaN MMIC Doherty PA. IEEE Transactions on Microwave Theory and Techniques (10.1109/TMTT.2024.3474092)
- Rubio, J. J. M., Azad, E. M. and Quaglia, R. 2024. A differential combiner for quasi-complete cancellation of output capacitance in mm-wave power amplifiers with high- Q devices. IEEE Transactions on Microwave Theory and Techniques 72(9), pp. 5309-5318. (10.1109/TMTT.2024.3365932)
- 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)
- Piacibello, A. et al. 2024. High-gain and high-linearity MMIC GaN Doherty Power Amplifier with 3-GHz bandwidth for Ka-band satellite communications. IEEE Microwave and Wireless Technology Letters 34(6), pp. 765-768. (10.1109/LMWT.2024.3384306)
- 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)
- Bogusz, A., Li, W., Lees, J., Quaglia, R., Montoro, G., Gilabert, P. L. and Cripps, S. 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 2024Proceedings of IEEE/MTT-S International Microwave Symposium. IEEE pp. 580-583., (10.1109/IMS40175.2024.10600335)
- Quaglia, R., Cripps, S. and Powell, J. 2024. Impact of matching networks on the impedance settling time in high frequency power amplifiers. 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. 28-30., (10.1109/PAWR59907.2024.10438584)
- 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)
- Ghozati, S. U., Baddeley, A. and Quaglia, R. 2024. Large-signal characterization and behavioral modeling of mm-wave GaN HEMT switches tailored for advanced power amplifier architectures. 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). IEEE pp. 21-23., (10.1109/PAWR59907.2024.10438592)
- 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)
- Yuan, T., Quaglia, R., Chaudhry, K., Azad, E., Powell, J. R. and Cripps, S. C. 2023. Output signal re-injection in load modulated balanced amplifiers for RF bandwidth improvement. IEEE Microwave and Wireless Components Letters 33(10), pp. 1458-1461. (10.1109/LMWT.2023.3305812)
- Urvoy, J., Quaglia, R., Powell, J. R. and Cripps, S. C. 2023. Experimental characterization of a dual-input OLMBA for back-off efficiency improvement. Presented at: 53rd European Microwave Conference (EuMC), Berlin, Germany, 19-21 September 2023Proceedings of 53rd European Microwave Conference. IEEE pp. 267-270., (10.23919/EuMC58039.2023.10290592)
- 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)
- Li, W., Bogusz, A., Lees, J., Quaglia, R., Cripps, S., Montoro, G. and Gilabert, P. L. 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 2023Proceedings of the 2023 IEEE/MTT-S International Microwave Symposium (IMS). IEEE pp. 203-206., (10.1109/IMS37964.2023.10188039)
- 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
- Quaglia, R. and Camarchia, V. 2022. PAWR 2023 [RWW 2023]. IEEE Microwave Magazine 23(12), pp. 30-30. (10.1109/MMM.2022.3203924)
- Quaglia, R., Pang, J., Cripps, S. C. and Zhu, A. 2022. Load-modulated balanced amplifier: from first invention to recent development. IEEE Microwave Magazine 23(12), pp. 60-70. (10.1109/MMM.2022.3203940)
- 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)
- Quaglia, R., Powell, J. R., Chaudhry, K. and Cripps, S. C. 2022. Mitigation of load mismatch effects using an orthogonal load modulated balanced amplifier. IEEE Transactions on Microwave Theory and Techniques 70(6), pp. 3329-3341. (10.1109/TMTT.2022.3167414)
- 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)
- Quaglia, R., Ramella, C., Piacibello, A., Camarchia, V. and Pirola, M. 2022. K-band GaAs Doherty power amplifiers for microwave backhaul. Presented at: 2022 International Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits (INMMiC), Cardiff, Wales, 07-08 April 20222022 International Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits (INMMiC). IEEE pp. 1-3., (10.1109/INMMiC54248.2022.9762217)
- Quaglia, R., Powell, J., Chaudhry, K. and Cripps, S. 2022. Effect of HEMT output characteristics on the load mismatch resilience in balanced power amplifiers. Presented at: 2022 International Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits (INMMiC), Cardiff, Wales, 07-08 April 20222022 International Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits (INMMiC). IEEE pp. 1-3., (10.1109/INMMiC54248.2022.9762184)
- Piacibello, A. et al. 2022. A 5-w gan doherty amplifier for ka-band satellite downlink with 4-ghz bandwidth and 17-db npr. IEEE Microwave and Wireless Components Letters 32(8), pp. 964-967. (10.1109/LMWC.2022.3160227)
- 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)
- Piacibello, A., Moreno Rubio, J. J., Quaglia, R. and Camarchia, V. 2022. AM/PM characterization of wideband power amplifiers. Presented at: IEEE Topical Conference on RF/Microwave Power Amplifiers for Radio and Wireless Applications (PAWR), Las Vegas, NV, USA, 16-19 January 2022Proceedings of IEEE Topical Conference on RF/Microwave Power Amplifiers for Radio and Wireless Applications. IEEE, (10.1109/PAWR53092.2022.9719787)
- Costanzo, F. et al. 2022. A GaN MMIC stacked doherty power amplifier for space applications. Presented at: IEEE Topical Conference on RF/Microwave Power Amplifiers for Radio and Wireless Applications (PAWR), Las Vegas, NV, USA, 16-19 January 2022Proceedings of Topical Conference on RF/Microwave Power Amplifiers for Radio and Wireless Applications (PAWR). IEEE pp. 29-31., (10.1109/PAWR53092.2022.9719789)
- Guillena, E., Li, W., Montoro, G., Quaglia, R. and Gilabert, P. L. 2022. Reconfigurable DPD based on ANNs for wideband load modulated balanced amplifiers under dynamic operation from 1.8 to 2.4 GHz. IEEE Transactions on Microwave Theory and Techniques 70(1), pp. 453-465.
- 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
- Piacibello, A., Costanzo, F., Giofré, R., Quaglia, R., Colantonio, P., Pirola, M. and Camarchia, V. 2021. Evaluation of a stacked-FET cell for high-frequency applications (invited paper). International Journal of Numerical Modelling: Electronic Networks, Devices and Fields 34(5), article number: e2881. (10.1002/jnm.2881)
- 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)
- Ramella, C., Camarchia, V., Piacibello, A., Piacibello, A., Pirola, M. and Quaglia, R. 2021. Watt-level 21-25 GHz integrated Doherty power amplifier in GaAs technology. IEEE Microwave and Wireless Components Letters 31(5), pp. 505-508. (10.1109/LMWC.2021.3069555)
- Wang, T., Li, W., Quaglia, R. and Gilabert, P. L. 2021. Machine-learning assisted optimisation of free-parameters of a dual-input power amplifier for wideband applications. Sensors 21(8), article number: 2831. (10.3390/s21082831)
- Piacibello, A., Ramella, C., Camarchia, V., Quaglia, R. and Pirola, M. 2021. A simple method to identify parametric oscillations in power amplifiers using harmonic balance solvers. IEEE Microwave and Wireless Components Letters 31(3), pp. 269-271. (10.1109/LMWC.2021.3049939)
- Quaglia, R. 2021. Improvement of small signal equivalent simulations for power and efficiency matching of GaN HEMTs. Electronics 10(3), article number: 263. (10.3390/electronics10030263)
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)
- Collins, D. J., Quaglia, R., Powell, J. and Cripps, S. 2020. The orthogonal LMBA: a novel RFPA architecture with broadband reconfigurability. IEEE Microwave and Wireless Components Letters 30(9), pp. 888-891. (10.1109/LMWC.2020.3010817)
- 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)
- Chaudry, K., Quaglia, R. and Cripps, S. 2020. A load modulated balanced amplifier with linear gain response and wide high-efficiency output power back-off region. 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/INMMiC46721.2020.9160205)
- 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)
- Piacibello, A., Costanzo, F., Giofrè, R., Hayes, D., Quaglia, R. and Camarchia, V. 2020. GaN Doherty MMIC power amplifiers for satellite Ka-band downlink. 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/INMMiC46721.2020.9160047)
- 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)
- Quaglia, R. 2020. A review of technologies and design techniques of millimeter-wave power amplifiers. IEEE Transactions on Microwave Theory and Techniques 68(7), pp. 2957-2983. (10.1109/TMTT.2020.2989792)
- Quaglia, R. et al. 2020. Source/load-pull characterisation of GaN on Si HEMTs with data analysis targeting Doherty design. Presented at: 2020 IEEE Topical Conference on RF/Microwave Power Amplifiers for Radio and Wireless Applications (PAWR), San Antonio, TX, USA, 26-29 January, 20202020 IEEE Topical Conference on RF/Microwave Power Amplifiers for Radio and Wireless Applications (PAWR). IEEE pp. 5-8., (10.1109/PAWR46754.2020.9035999)
- Quaglia, R. et al. 2020. Source/load-pull characterisation of GaN on Si HEMTs with data analysis targeting doherty design. Presented at: Radio and Wireless Week 2020, San Antonio, Texas, USA, 26-29 January 2020. pp. -.
2019
- Quaglia, R., Powell, J. and Collins, D. 2019. Load modulated balanced amplifier. In: Webster, J. G. ed. The Wiley Encyclopedia of Electrical and Electronics Engineering. Vol 3.. Wiley-Blackwell
- Bogusz, A., Lees, J., Quaglia, R., Watkins, G. and Cripps, S. 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)
- 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)
- Quaglia, R., Greene, M. D., Poulton, M. J. and Cripps, S. C. 2019. A 1.8-3.2 GHz Doherty Power Amplifier in quasi-MMIC Technology. IEEE Microwave and Wireless Components Letters 29(5), pp. 345-347. (10.1109/LMWC.2019.2904883)
- 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)
- 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 2019IEEE Topical Conference on RF/Microwave Power Amplifiers for Radio and Wireless Applications (PAWR). IEEE
- Piacibello, A., Quaglia, R., Camarchia, V., Ramella, C. and Pirola, M. 2019. Optimisation of a Doherty power amplifier based on dual-input characterisation. Presented at: IEEE COMCAS 2019, International Conference on Microwave, Communication, Antennas & Electronic Systems, Tel Aviv, Israel, 4-6 November 2019 Presented at Piacibello, A. et al. eds.2019 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems (COMCAS). IEEE, (10.1109/COMCAS44984.2019.8958432)
- Bogusz, A., Lees, J., Quaglia, R., Watkins, G. T. and Cripps, S. 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 20192019 IEEE MTT-S International Microwave Conference on Hardware and Systems for 5G and Beyond (IMC-5G). IEEE pp. 1-3., (10.1109/IMC-5G47857.2019.9160351)
2018
- 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)
- 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. -.
- Piacibello, A., Pirola, M., Camarchia, V., Ramella, C. and Quaglia, R. 2018. A Ku-band Compact MMIC PA based on Stacked GaAs pHEMT cells. Presented at: International Workshop on Integrated Nonlinear Microwave and Millimetre-wave Circuits (INMMIC), Brive La Gaillarde, France, 5-6 Jul 20182018 International Workshop on Integrated Nonlinear Microwave and Millimetre-wave Circuits (INMMIC). IEEE, (10.1109/INMMIC.2018.8429989)
- Quaglia, R., Camarchia, V. and Pirola, M. 2018. K-band combined GaAs monolithic Doherty power amplifier. Presented at: 2018 IEEE MTT-S International Wireless Symposium (IWS), Chengdu, China, 6-10 May 20182018 IEEE MTT-S International Wireless Symposium (IWS2018). IEEE, (10.1109/IEEE-IWS.2018.8400882)
- Piacibello, A., Quaglia, R., Camarchia, V., Ramella, C. and Pirola, M. 2018. Dual-input driving strategies for performance enhancement of a doherty power amplifier. Presented at: 2018 IEEE MTT-S International Wireless Symposium (IWS), Chengdu, China, 6-10 May 20182018 IEEE MTT-S International Wireless Symposium (IWS). IEEE, (10.1109/IEEE-IWS.2018.8400845)
- Powell, J. R., Shepphard, D. J., Quaglia, R. and Cripps, S. C. 2018. A power reconfigurable high-efficiency $X$ -band power amplifier MMIC using the load modulated balanced amplifier technique. IEEE Microwave and Wireless Components Letters 28(6), pp. 527-529. (10.1109/LMWC.2018.2824560)
- 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)
- Quaglia, R. and Cripps, S. 2018. A load modulated balanced amplifier for telecom applications. IEEE Transactions on Microwave Theory and Techniques 66(3), pp. 1328-1338. (10.1109/TMTT.2017.2766066)
- Moreno Rubio, J. J., Camarchia, V., Pirola, M. and Quaglia, R. 2018. Design of a 87% fractional bandwidth Doherty Power Amplifier supported by a simplified bandwidth estimation method. IEEE Transactions on Microwave Theory and Techniques 66(3), pp. 1319-1327. (10.1109/TMTT.2017.2767586)
- 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.
- Collins, D., Quaglia, R., Powell, J. and Cripps, S. 2018. Experimental characterization of a load modulated balanced amplifier with simplified input power splitter. Presented at: APMC 2018, Kyoto, Japan, 6-9 Nov 2018.
2017
- Ramella, C., Piacibello, A., Quaglia, R., Camarchia, V. and Pirola, M. 2017. High efficiency power amplifiers for modern mobile communications: The load-modulation approach. Electronics 6(4), article number: 96. (10.3390/electronics6040096)
- Quaglia, R., Bell, J. J. and Cripps, S. 2017. New general formulation and experimental verification of harmonic clipping contours in high-frequency power devices. IEEE Transactions on Microwave Theory and Techniques 65(10), pp. 3903-3909. (10.1109/TMTT.2017.2687900)
- Quaglia, R., Greene, M. D., Poulton, M. J. and Cripps, S. C. 2017. Design and characterization of a 1.7?2.7 GHz quasi-MMIC Doherty power amplifier. 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. 771-773., (10.1109/MWSYM.2017.8058689)
- Camarchia, V. et al. 2017. A design strategy for AM/PM compensation in GaN Doherty power amplifiers. IEEE Access 5, pp. 22244-22251. (10.1109/ACCESS.2017.2759164)
- Camarchia, V., Quaglia, R., Ramella, C. and Pirola, M. 2017. Power amplifier MMICs for 15 GHz microwave links in 0.25 mu m GaN technology. Presented at: 2017 Integrated Nonlinear Microwave and Millimetre-wave Circuits Workshop (INMMiC), Graz, Austria, 20-21 April 20172017 Integrated Nonlinear Microwave and Millimetre-wave Circuits Workshop (INMMiC). IEEE, (10.1109/INMMIC.2017.7927311)
- Quaglia, R., Camarchia, V., Moreno Rubio, J., Pirola, M. and Ghione, G. 2017. A 4W Doherty power amplifier in GaN MMIC technology for 15GHz applications. IEEE Microwave and Wireless Components Letters 27(4), pp. 365-367. (10.1109/LMWC.2017.2678440)
- Quaglia, R., Shepphard, D. J. and Cripps, S. 2017. A reappraisal of optimum output matching conditions in microwave power transistors. IEEE Transactions on Microwave Theory and Techniques 65(3), pp. 838-845. (10.1109/TMTT.2016.2627557)
- Quaglia, R. and Cripps, S. C. 2017. Harmonic clipping contours: numerical computation and extension to higher harmonics. Presented at: European Microwave Conference, London, UK, 3-7 Oct. 2016Microwave Conference (EuMC), 2016 46th European. IEEE pp. 405-408., (10.1109/EuMC.2016.7824365)
2016
- Camarchia, V., Cipriani, E., Colantonio, P., Pirola, M., Quaglia, R., Cabria, L. and Ayllon, N. 2016. Characterization of a high power GaN device for class E PA design with non-sinusoidal stimulus. Presented at: 2016 11th European Microwave Integrated Circuits Conference (EuMIC), London, UK, 3-4 October 2016Microwave Integrated Circuits Conference (EuMIC), 2016 11th European. IEEE pp. 53., (10.1109/EuMIC.2016.7777487)
- Ramella, C., Piacibello, A., Camarchia, V., Pirola, M. and Quaglia, R. 2016. Characterization-oriented design of a compact GaAs MMIC 3-stacked power cell. Presented at: Microwave, Radar and Wireless Communications (MIKON), 2016 21st International Conference on, Krakow, Poland, 9-11 May 2016Microwave, Radar andWireless Communications (MIKON), 2016 21st International Conference on. IEEE, (10.1109/MIKON.2016.7491950)
- Iqbal, M., Camarchia, V., Pirola, M. and Quaglia, R. 2016. A miniaturized wilkinson power divider for ultra wide-band operation. Presented at: 2016 21st International Conference on Microwave, Radar and Wireless Communications (MIKON)2016 21st International Conference on Microwave, Radar and Wireless Communications (MIKON). IEEE, (10.1109/MIKON.2016.7492081)
- Moreno Rubio, J., Camarchia, V., Quaglia, R., Ferney, A. M. E. and Pirola, M. 2016. A 0.6-3.8GHz GaN Power Amplifier designed through a simple strategy. IEEE Microwave and Wireless Components Letters 26(6), pp. 446-448., article number: http://. (10.1109/LMWC.2016.2549263)
- Giofrè, R. et al. 2016. A comprehensive comparison between GaN MMIC Doherty and combined class-AB power amplifiers for microwave radio links. International Journal of Microwave and Wireless Technologies 8(4-5), pp. 673-681. (10.1017/S175907871600012X)
- Quaglia, R., Camarchia, V., Pirola, M. and Ghione, G. 2016. GaN monolithic power amplifiers for microwave backhaul applications. Electronics 5(2), article number: 25. (10.3390/electronics5020025)
2015
- Camarchia, V., Pirola, M., Quaglia, R., Jee, S., Cho, Y. and Kim, B. 2015. The Doherty power amplifier: review of recent solutions and trends. IEEE Transactions on Microwave Theory and Techniques 63(2), pp. 559-571. (10.1109/TMTT.2014.2387061)
- Giofre, R. et al. 2015. GaN-MMIC Doherty power amplifier with integrated reconfigurable input network for microwave backhaul applications. Presented at: 2015 IEEE MTT-S International Microwave Symposium (IMS), Phoenix, AZ, 17-22 May 20152015 IEEE MTT-S International Microwave Symposium (IMS). IEEE, (10.1109/MWSYM.2015.7166763)
- Fersch, T. et al. 2015. Stacked GaAs pHEMTs: Design of a K-band power amplifier and experimental characterization of mismatch effects. Presented at: 2015 IEEE MTT-S International Microwave Symposium (IMS), Phoenix, AZ, 17-22 May 20152015 IEEE MTT-S International Microwave Symposium (IMS). IEEE, (10.1109/MWSYM.2015.7166762)
2014
- Chiolerio, A., Camarchia, V., Quaglia, R., Pirola, M., Pandolfi, P. and Pirri, C. F. 2014. Hybrid Ag-based inks for nanocomposite inkjet printed lines: RF properties. Journal of Alloys and Compounds 615(Supp 1), pp. S501-S504. (10.1016/j.jallcom.2013.12.174)
- Quaglia, R., Camarchia, V., Tao, J., Pirola, M., Donati Guerrieri, S. and Loran, B. 2014. K-Band GaAs MMIC Doherty power amplifier for microwave radio with optimized driver. IEEE Transactions on Microwave Theory and Techniques 62(11), pp. 2518-2525. (10.1109/TMTT.2014.2360395)
- Quaglia, R., Camarchia, V., Pirola, M., Moreno Rubio, J. and Ghione, G. 2014. Linear GaN MMIC combined power amplifiers for 7-GHz microwave backhaul. IEEE Transactions on Microwave Theory and Techniques 62(11), pp. 2700-2710. (10.1109/TMTT.2014.2359856)
- Pirola, M., Quaglia, R., Ghione, G., Ciccognani, W. and Limiti, E. 2014. 13-bit GaAs serial-to-parallel converter with compact layout for core-chip applications. Microelectronics Journal 45(7), pp. 864-869. (10.1016/j.mejo.2014.04.036)
- Piazzon, L. et al. 2014. Effect of load modulation on phase distortion in Doherty power amplifiers. IEEE Microwave and Wireless Components Letters 24(7), pp. 505-507. (10.1109/LMWC.2014.2316507)
- Quaglia, R., Camarchia, V. and Pirola, M. 2014. Dual-band GaN MMIC power amplifier for microwave backhaul applications. IEEE Microwave and Wireless Components Letters 24(6), pp. 409-411. (10.1109/LMWC.2014.2313587)
- Quaglia, R. et al. 2014. Experimental investigation of bias current and load modulation effects in phase distortion of GaN HEMTs. Electronics letters 50(10), pp. 773-775. (10.1049/el.2014.0983)
- Camarchia, V. et al. 2014. Demonstration of inkjet-printed silver nanoparticle microstrip lines on alumina for RF power modules. Organic Electronics 15(1), pp. 91-98. (10.1016/j.orgel.2013.10.018)
2013
- Camarchia, V. et al. 2013. High-Efficiency 7 GHz Doherty GaN MMIC Power Amplifiers for mackhaul radio links. IEEE Transactions of Electron Devices 60(10), pp. 3592-3595. (10.1109/TED.2013.2274669)
- Camarchia, V. et al. 2013. Bandwidth extension of GaN Doherty power amplifier: Effect on power, efficiency and linearity. Presented at: 2013 IEEE International Wireless Symposium (IWS), Beijing, China, 14-18 April 20132013 IEEE International Wireless Symposium (IWS). IEEE pp. 1-4., (10.1109/IEEE-IWS.2013.6616789)
- Quaglia, R., Pirola, M. and Ramella, C. 2013. Offset lines in Doherty Power Amplifiers: analytical demonstration and design. IEEE Microwave and Wireless Components Letters 23(2), pp. 93-95. (10.1109/LMWC.2013.2241535)
- Camarchia, V., Fang, J., Moreno Rubio, J., Pirola, M. and Quaglia, R. 2013. 7 GHz MMIC GaN Doherty Power Amplifier with 47% efficiency at 7 dB output back-off. IEEE Microwave and Wireless Components Letters 23(1), pp. 34-36. (10.1109/LMWC.2012.2234090)
2012
- Fang, J. et al. 2012. 3.5 GHz WiMAX GaN doherty power amplifier with second harmonic tuning. Microwave and Optical Technology Letters 54(11), pp. 2601-2605. (10.1002/mop.27132)
- Camarchia, V., Fang, J., Ghione, G., Rubio, J. M., Pirola, M. and Quaglia, R. 2012. X-band wideband 5W GaN MMIC power amplifier with large-signal gain equalization. Presented at: 2012 Workshop on Integrated Nonlinear Microwave and Millimetre-wave Circuits, Dublin, Ireland, 3-4 September 20122012 Workshop on Integrated Nonlinear Microwave and Millimetre-wave Circuits. IEEE pp. 1-3., (10.1109/INMMIC.2012.6331935)
- Moreno Rubio, J., Fang, J., Camarchia, V., Quaglia, R., Pirola, M. and Ghione, G. 2012. 3–3.6-GHz wideband GaN Doherty Power Amplifier exploiting output compensation stages. IEEE Transactions on Microwave Theory and Techniques 60(8), pp. 2543-2548. (10.1109/TMTT.2012.2201745)
- Moreno Rubio, J., Fang, J., Quaglia, R., Camarchia, V., Pirola, M. and Ghione, G. 2012. Development of single-stage and doherty GaN-based hybrid RF power amplifiers for quasi-constant envelope and high peak to average power ratio wireless standards. Microwave and Optical Technology Letters 54(1), pp. 206-210. (10.1002/mop.26459)
2011
- Moreno Rubio, J., Fang, J., Quaglia, R., Camarchia, V., Pirola, M., Donati Guerrieri, S. and Ghione, G. 2011. A 22W 65% efficiency GaN Doherty Power Amplifier at 3.5 GHz for WiMAX applications. Presented at: 2011 Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits, Vienna, Austria, 18-19 April 2011Integrated Nonlinear Microwave and Millimeterwave Circuits, INMMIC, International Workshop on. IEEE pp. 1., (10.1109/INMMIC.2011.5773332)
2009
- Quaglia, R., Camarchia, V., Cappelluti, F., Guerrieri, S. D., Lima, E. G., Ghione, G. and Pirola, M. 2009. Behavioral modeling of GaN-based power amplifiers: impact of electrothermal feedback on the model accuracy and identification. Microwave and Optical Technology Letters 51(11), pp. 2789-2792. (10.1002/mop.24732)
Articles
- Piacibello, A., Figueiredo, R., Quaglia, R., Giofre, R., Colantonio, P., Borges Carvalho, N. and Camarchia, V. 2024. Design and extensive NPR characterization of a highly-linear SatCom GaN MMIC Doherty PA. IEEE Transactions on Microwave Theory and Techniques (10.1109/TMTT.2024.3474092)
- Rubio, J. J. M., Azad, E. M. and Quaglia, R. 2024. A differential combiner for quasi-complete cancellation of output capacitance in mm-wave power amplifiers with high- Q devices. IEEE Transactions on Microwave Theory and Techniques 72(9), pp. 5309-5318. (10.1109/TMTT.2024.3365932)
- 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)
- Piacibello, A. et al. 2024. High-gain and high-linearity MMIC GaN Doherty Power Amplifier with 3-GHz bandwidth for Ka-band satellite communications. IEEE Microwave and Wireless Technology Letters 34(6), pp. 765-768. (10.1109/LMWT.2024.3384306)
- 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., 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
- Yuan, T., Quaglia, R., Chaudhry, K., Azad, E., Powell, J. R. and Cripps, S. C. 2023. Output signal re-injection in load modulated balanced amplifiers for RF bandwidth improvement. IEEE Microwave and Wireless Components Letters 33(10), pp. 1458-1461. (10.1109/LMWT.2023.3305812)
- Quaglia, R. and Camarchia, V. 2022. PAWR 2023 [RWW 2023]. IEEE Microwave Magazine 23(12), pp. 30-30. (10.1109/MMM.2022.3203924)
- Quaglia, R., Pang, J., Cripps, S. C. and Zhu, A. 2022. Load-modulated balanced amplifier: from first invention to recent development. IEEE Microwave Magazine 23(12), pp. 60-70. (10.1109/MMM.2022.3203940)
- 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)
- Quaglia, R., Powell, J. R., Chaudhry, K. and Cripps, S. C. 2022. Mitigation of load mismatch effects using an orthogonal load modulated balanced amplifier. IEEE Transactions on Microwave Theory and Techniques 70(6), pp. 3329-3341. (10.1109/TMTT.2022.3167414)
- Piacibello, A. et al. 2022. A 5-w gan doherty amplifier for ka-band satellite downlink with 4-ghz bandwidth and 17-db npr. IEEE Microwave and Wireless Components Letters 32(8), pp. 964-967. (10.1109/LMWC.2022.3160227)
- Guillena, E., Li, W., Montoro, G., Quaglia, R. and Gilabert, P. L. 2022. Reconfigurable DPD based on ANNs for wideband load modulated balanced amplifiers under dynamic operation from 1.8 to 2.4 GHz. IEEE Transactions on Microwave Theory and Techniques 70(1), pp. 453-465.
- Piacibello, A., Costanzo, F., Giofré, R., Quaglia, R., Colantonio, P., Pirola, M. and Camarchia, V. 2021. Evaluation of a stacked-FET cell for high-frequency applications (invited paper). International Journal of Numerical Modelling: Electronic Networks, Devices and Fields 34(5), article number: e2881. (10.1002/jnm.2881)
- 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)
- Ramella, C., Camarchia, V., Piacibello, A., Piacibello, A., Pirola, M. and Quaglia, R. 2021. Watt-level 21-25 GHz integrated Doherty power amplifier in GaAs technology. IEEE Microwave and Wireless Components Letters 31(5), pp. 505-508. (10.1109/LMWC.2021.3069555)
- Wang, T., Li, W., Quaglia, R. and Gilabert, P. L. 2021. Machine-learning assisted optimisation of free-parameters of a dual-input power amplifier for wideband applications. Sensors 21(8), article number: 2831. (10.3390/s21082831)
- Piacibello, A., Ramella, C., Camarchia, V., Quaglia, R. and Pirola, M. 2021. A simple method to identify parametric oscillations in power amplifiers using harmonic balance solvers. IEEE Microwave and Wireless Components Letters 31(3), pp. 269-271. (10.1109/LMWC.2021.3049939)
- Quaglia, R. 2021. Improvement of small signal equivalent simulations for power and efficiency matching of GaN HEMTs. Electronics 10(3), article number: 263. (10.3390/electronics10030263)
- Collins, D. J., Quaglia, R., Powell, J. and Cripps, S. 2020. The orthogonal LMBA: a novel RFPA architecture with broadband reconfigurability. IEEE Microwave and Wireless Components Letters 30(9), pp. 888-891. (10.1109/LMWC.2020.3010817)
- 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)
- Quaglia, R. 2020. A review of technologies and design techniques of millimeter-wave power amplifiers. IEEE Transactions on Microwave Theory and Techniques 68(7), pp. 2957-2983. (10.1109/TMTT.2020.2989792)
- Bogusz, A., Lees, J., Quaglia, R., Watkins, G. and Cripps, S. 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)
- Quaglia, R., Greene, M. D., Poulton, M. J. and Cripps, S. C. 2019. A 1.8-3.2 GHz Doherty Power Amplifier in quasi-MMIC Technology. IEEE Microwave and Wireless Components Letters 29(5), pp. 345-347. (10.1109/LMWC.2019.2904883)
- Powell, J. R., Shepphard, D. J., Quaglia, R. and Cripps, S. C. 2018. A power reconfigurable high-efficiency $X$ -band power amplifier MMIC using the load modulated balanced amplifier technique. IEEE Microwave and Wireless Components Letters 28(6), pp. 527-529. (10.1109/LMWC.2018.2824560)
- Quaglia, R. and Cripps, S. 2018. A load modulated balanced amplifier for telecom applications. IEEE Transactions on Microwave Theory and Techniques 66(3), pp. 1328-1338. (10.1109/TMTT.2017.2766066)
- Moreno Rubio, J. J., Camarchia, V., Pirola, M. and Quaglia, R. 2018. Design of a 87% fractional bandwidth Doherty Power Amplifier supported by a simplified bandwidth estimation method. IEEE Transactions on Microwave Theory and Techniques 66(3), pp. 1319-1327. (10.1109/TMTT.2017.2767586)
- Ramella, C., Piacibello, A., Quaglia, R., Camarchia, V. and Pirola, M. 2017. High efficiency power amplifiers for modern mobile communications: The load-modulation approach. Electronics 6(4), article number: 96. (10.3390/electronics6040096)
- Quaglia, R., Bell, J. J. and Cripps, S. 2017. New general formulation and experimental verification of harmonic clipping contours in high-frequency power devices. IEEE Transactions on Microwave Theory and Techniques 65(10), pp. 3903-3909. (10.1109/TMTT.2017.2687900)
- Camarchia, V. et al. 2017. A design strategy for AM/PM compensation in GaN Doherty power amplifiers. IEEE Access 5, pp. 22244-22251. (10.1109/ACCESS.2017.2759164)
- Quaglia, R., Camarchia, V., Moreno Rubio, J., Pirola, M. and Ghione, G. 2017. A 4W Doherty power amplifier in GaN MMIC technology for 15GHz applications. IEEE Microwave and Wireless Components Letters 27(4), pp. 365-367. (10.1109/LMWC.2017.2678440)
- Quaglia, R., Shepphard, D. J. and Cripps, S. 2017. A reappraisal of optimum output matching conditions in microwave power transistors. IEEE Transactions on Microwave Theory and Techniques 65(3), pp. 838-845. (10.1109/TMTT.2016.2627557)
- Moreno Rubio, J., Camarchia, V., Quaglia, R., Ferney, A. M. E. and Pirola, M. 2016. A 0.6-3.8GHz GaN Power Amplifier designed through a simple strategy. IEEE Microwave and Wireless Components Letters 26(6), pp. 446-448., article number: http://. (10.1109/LMWC.2016.2549263)
- Giofrè, R. et al. 2016. A comprehensive comparison between GaN MMIC Doherty and combined class-AB power amplifiers for microwave radio links. International Journal of Microwave and Wireless Technologies 8(4-5), pp. 673-681. (10.1017/S175907871600012X)
- Quaglia, R., Camarchia, V., Pirola, M. and Ghione, G. 2016. GaN monolithic power amplifiers for microwave backhaul applications. Electronics 5(2), article number: 25. (10.3390/electronics5020025)
- Camarchia, V., Pirola, M., Quaglia, R., Jee, S., Cho, Y. and Kim, B. 2015. The Doherty power amplifier: review of recent solutions and trends. IEEE Transactions on Microwave Theory and Techniques 63(2), pp. 559-571. (10.1109/TMTT.2014.2387061)
- Chiolerio, A., Camarchia, V., Quaglia, R., Pirola, M., Pandolfi, P. and Pirri, C. F. 2014. Hybrid Ag-based inks for nanocomposite inkjet printed lines: RF properties. Journal of Alloys and Compounds 615(Supp 1), pp. S501-S504. (10.1016/j.jallcom.2013.12.174)
- Quaglia, R., Camarchia, V., Tao, J., Pirola, M., Donati Guerrieri, S. and Loran, B. 2014. K-Band GaAs MMIC Doherty power amplifier for microwave radio with optimized driver. IEEE Transactions on Microwave Theory and Techniques 62(11), pp. 2518-2525. (10.1109/TMTT.2014.2360395)
- Quaglia, R., Camarchia, V., Pirola, M., Moreno Rubio, J. and Ghione, G. 2014. Linear GaN MMIC combined power amplifiers for 7-GHz microwave backhaul. IEEE Transactions on Microwave Theory and Techniques 62(11), pp. 2700-2710. (10.1109/TMTT.2014.2359856)
- Pirola, M., Quaglia, R., Ghione, G., Ciccognani, W. and Limiti, E. 2014. 13-bit GaAs serial-to-parallel converter with compact layout for core-chip applications. Microelectronics Journal 45(7), pp. 864-869. (10.1016/j.mejo.2014.04.036)
- Piazzon, L. et al. 2014. Effect of load modulation on phase distortion in Doherty power amplifiers. IEEE Microwave and Wireless Components Letters 24(7), pp. 505-507. (10.1109/LMWC.2014.2316507)
- Quaglia, R., Camarchia, V. and Pirola, M. 2014. Dual-band GaN MMIC power amplifier for microwave backhaul applications. IEEE Microwave and Wireless Components Letters 24(6), pp. 409-411. (10.1109/LMWC.2014.2313587)
- Quaglia, R. et al. 2014. Experimental investigation of bias current and load modulation effects in phase distortion of GaN HEMTs. Electronics letters 50(10), pp. 773-775. (10.1049/el.2014.0983)
- Camarchia, V. et al. 2014. Demonstration of inkjet-printed silver nanoparticle microstrip lines on alumina for RF power modules. Organic Electronics 15(1), pp. 91-98. (10.1016/j.orgel.2013.10.018)
- Camarchia, V. et al. 2013. High-Efficiency 7 GHz Doherty GaN MMIC Power Amplifiers for mackhaul radio links. IEEE Transactions of Electron Devices 60(10), pp. 3592-3595. (10.1109/TED.2013.2274669)
- Quaglia, R., Pirola, M. and Ramella, C. 2013. Offset lines in Doherty Power Amplifiers: analytical demonstration and design. IEEE Microwave and Wireless Components Letters 23(2), pp. 93-95. (10.1109/LMWC.2013.2241535)
- Camarchia, V., Fang, J., Moreno Rubio, J., Pirola, M. and Quaglia, R. 2013. 7 GHz MMIC GaN Doherty Power Amplifier with 47% efficiency at 7 dB output back-off. IEEE Microwave and Wireless Components Letters 23(1), pp. 34-36. (10.1109/LMWC.2012.2234090)
- Fang, J. et al. 2012. 3.5 GHz WiMAX GaN doherty power amplifier with second harmonic tuning. Microwave and Optical Technology Letters 54(11), pp. 2601-2605. (10.1002/mop.27132)
- Moreno Rubio, J., Fang, J., Camarchia, V., Quaglia, R., Pirola, M. and Ghione, G. 2012. 3–3.6-GHz wideband GaN Doherty Power Amplifier exploiting output compensation stages. IEEE Transactions on Microwave Theory and Techniques 60(8), pp. 2543-2548. (10.1109/TMTT.2012.2201745)
- Moreno Rubio, J., Fang, J., Quaglia, R., Camarchia, V., Pirola, M. and Ghione, G. 2012. Development of single-stage and doherty GaN-based hybrid RF power amplifiers for quasi-constant envelope and high peak to average power ratio wireless standards. Microwave and Optical Technology Letters 54(1), pp. 206-210. (10.1002/mop.26459)
- Quaglia, R., Camarchia, V., Cappelluti, F., Guerrieri, S. D., Lima, E. G., Ghione, G. and Pirola, M. 2009. Behavioral modeling of GaN-based power amplifiers: impact of electrothermal feedback on the model accuracy and identification. Microwave and Optical Technology Letters 51(11), pp. 2789-2792. (10.1002/mop.24732)
Book sections
- Quaglia, R., Powell, J. and Collins, D. 2019. Load modulated balanced amplifier. In: Webster, J. G. ed. The Wiley Encyclopedia of Electrical and Electronics Engineering. Vol 3.. Wiley-Blackwell
Conferences
- Powell, A. G., Quaglia, R., Powell, J. and Cripps, S. C. 2024. Efficient output power configuration in a K-Band power amplifier using a split-gate layout. Presented at: 19th European Microwave Integrated Circuits Conference (EuMIC), Paris, France, 23-24 September 20242024 19th European Microwave Integrated Circuits Conference (EuMIC). IEEE pp. 275-278., (10.23919/eumic61603.2024.10732591)
- Azad, E. M., Chaudhry, K. A., Gannicliffe, J. and Quaglia, R. 2024. Design and experimental characterization of an asymmetric GaN MMIC Doherty power amplifier for Ka-Band transmitters. Presented at: 19th European Microwave Integrated Circuits Conference (EuMIC), Paris, France, 23-24 September 20242024 19th European Microwave Integrated Circuits Conference (EuMIC). IEEE pp. 158-161., (10.23919/eumic61603.2024.10732357)
- Bogusz, A., Li, W., Lees, J., Quaglia, R., Montoro, G., Gilabert, P. L. and Cripps, S. 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 2024Proceedings of IEEE/MTT-S International Microwave Symposium. IEEE pp. 580-583., (10.1109/IMS40175.2024.10600335)
- Quaglia, R., Cripps, S. and Powell, J. 2024. Impact of matching networks on the impedance settling time in high frequency power amplifiers. 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. 28-30., (10.1109/PAWR59907.2024.10438584)
- 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)
- Ghozati, S. U., Baddeley, A. and Quaglia, R. 2024. Large-signal characterization and behavioral modeling of mm-wave GaN HEMT switches tailored for advanced power amplifier architectures. 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). IEEE pp. 21-23., (10.1109/PAWR59907.2024.10438592)
- 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)
- Urvoy, J., Quaglia, R., Powell, J. R. and Cripps, S. C. 2023. Experimental characterization of a dual-input OLMBA for back-off efficiency improvement. Presented at: 53rd European Microwave Conference (EuMC), Berlin, Germany, 19-21 September 2023Proceedings of 53rd European Microwave Conference. IEEE pp. 267-270., (10.23919/EuMC58039.2023.10290592)
- 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)
- Li, W., Bogusz, A., Lees, J., Quaglia, R., Cripps, S., Montoro, G. and Gilabert, P. L. 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 2023Proceedings of the 2023 IEEE/MTT-S International Microwave Symposium (IMS). IEEE pp. 203-206., (10.1109/IMS37964.2023.10188039)
- 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)
- 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)
- 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)
- Quaglia, R., Ramella, C., Piacibello, A., Camarchia, V. and Pirola, M. 2022. K-band GaAs Doherty power amplifiers for microwave backhaul. Presented at: 2022 International Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits (INMMiC), Cardiff, Wales, 07-08 April 20222022 International Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits (INMMiC). IEEE pp. 1-3., (10.1109/INMMiC54248.2022.9762217)
- Quaglia, R., Powell, J., Chaudhry, K. and Cripps, S. 2022. Effect of HEMT output characteristics on the load mismatch resilience in balanced power amplifiers. Presented at: 2022 International Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits (INMMiC), Cardiff, Wales, 07-08 April 20222022 International Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits (INMMiC). IEEE pp. 1-3., (10.1109/INMMiC54248.2022.9762184)
- 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)
- Piacibello, A., Moreno Rubio, J. J., Quaglia, R. and Camarchia, V. 2022. AM/PM characterization of wideband power amplifiers. Presented at: IEEE Topical Conference on RF/Microwave Power Amplifiers for Radio and Wireless Applications (PAWR), Las Vegas, NV, USA, 16-19 January 2022Proceedings of IEEE Topical Conference on RF/Microwave Power Amplifiers for Radio and Wireless Applications. IEEE, (10.1109/PAWR53092.2022.9719787)
- Costanzo, F. et al. 2022. A GaN MMIC stacked doherty power amplifier for space applications. Presented at: IEEE Topical Conference on RF/Microwave Power Amplifiers for Radio and Wireless Applications (PAWR), Las Vegas, NV, USA, 16-19 January 2022Proceedings of Topical Conference on RF/Microwave Power Amplifiers for Radio and Wireless Applications (PAWR). IEEE pp. 29-31., (10.1109/PAWR53092.2022.9719789)
- 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)
- 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)
- Chaudry, K., Quaglia, R. and Cripps, S. 2020. A load modulated balanced amplifier with linear gain response and wide high-efficiency output power back-off region. 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/INMMiC46721.2020.9160205)
- 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)
- Piacibello, A., Costanzo, F., Giofrè, R., Hayes, D., Quaglia, R. and Camarchia, V. 2020. GaN Doherty MMIC power amplifiers for satellite Ka-band downlink. 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/INMMiC46721.2020.9160047)
- 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)
- Quaglia, R. et al. 2020. Source/load-pull characterisation of GaN on Si HEMTs with data analysis targeting Doherty design. Presented at: 2020 IEEE Topical Conference on RF/Microwave Power Amplifiers for Radio and Wireless Applications (PAWR), San Antonio, TX, USA, 26-29 January, 20202020 IEEE Topical Conference on RF/Microwave Power Amplifiers for Radio and Wireless Applications (PAWR). IEEE pp. 5-8., (10.1109/PAWR46754.2020.9035999)
- Quaglia, R. et al. 2020. Source/load-pull characterisation of GaN on Si HEMTs with data analysis targeting doherty design. Presented at: Radio and Wireless Week 2020, San Antonio, Texas, USA, 26-29 January 2020. pp. -.
- 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)
- 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)
- 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 2019IEEE Topical Conference on RF/Microwave Power Amplifiers for Radio and Wireless Applications (PAWR). IEEE
- Piacibello, A., Quaglia, R., Camarchia, V., Ramella, C. and Pirola, M. 2019. Optimisation of a Doherty power amplifier based on dual-input characterisation. Presented at: IEEE COMCAS 2019, International Conference on Microwave, Communication, Antennas & Electronic Systems, Tel Aviv, Israel, 4-6 November 2019 Presented at Piacibello, A. et al. eds.2019 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems (COMCAS). IEEE, (10.1109/COMCAS44984.2019.8958432)
- Bogusz, A., Lees, J., Quaglia, R., Watkins, G. T. and Cripps, S. 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 20192019 IEEE MTT-S International Microwave Conference on Hardware and Systems for 5G and Beyond (IMC-5G). IEEE pp. 1-3., (10.1109/IMC-5G47857.2019.9160351)
- 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)
- 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. -.
- Piacibello, A., Pirola, M., Camarchia, V., Ramella, C. and Quaglia, R. 2018. A Ku-band Compact MMIC PA based on Stacked GaAs pHEMT cells. Presented at: International Workshop on Integrated Nonlinear Microwave and Millimetre-wave Circuits (INMMIC), Brive La Gaillarde, France, 5-6 Jul 20182018 International Workshop on Integrated Nonlinear Microwave and Millimetre-wave Circuits (INMMIC). IEEE, (10.1109/INMMIC.2018.8429989)
- Quaglia, R., Camarchia, V. and Pirola, M. 2018. K-band combined GaAs monolithic Doherty power amplifier. Presented at: 2018 IEEE MTT-S International Wireless Symposium (IWS), Chengdu, China, 6-10 May 20182018 IEEE MTT-S International Wireless Symposium (IWS2018). IEEE, (10.1109/IEEE-IWS.2018.8400882)
- Piacibello, A., Quaglia, R., Camarchia, V., Ramella, C. and Pirola, M. 2018. Dual-input driving strategies for performance enhancement of a doherty power amplifier. Presented at: 2018 IEEE MTT-S International Wireless Symposium (IWS), Chengdu, China, 6-10 May 20182018 IEEE MTT-S International Wireless Symposium (IWS). IEEE, (10.1109/IEEE-IWS.2018.8400845)
- 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)
- 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.
- Collins, D., Quaglia, R., Powell, J. and Cripps, S. 2018. Experimental characterization of a load modulated balanced amplifier with simplified input power splitter. Presented at: APMC 2018, Kyoto, Japan, 6-9 Nov 2018.
- Quaglia, R., Greene, M. D., Poulton, M. J. and Cripps, S. C. 2017. Design and characterization of a 1.7?2.7 GHz quasi-MMIC Doherty power amplifier. 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. 771-773., (10.1109/MWSYM.2017.8058689)
- Camarchia, V., Quaglia, R., Ramella, C. and Pirola, M. 2017. Power amplifier MMICs for 15 GHz microwave links in 0.25 mu m GaN technology. Presented at: 2017 Integrated Nonlinear Microwave and Millimetre-wave Circuits Workshop (INMMiC), Graz, Austria, 20-21 April 20172017 Integrated Nonlinear Microwave and Millimetre-wave Circuits Workshop (INMMiC). IEEE, (10.1109/INMMIC.2017.7927311)
- Quaglia, R. and Cripps, S. C. 2017. Harmonic clipping contours: numerical computation and extension to higher harmonics. Presented at: European Microwave Conference, London, UK, 3-7 Oct. 2016Microwave Conference (EuMC), 2016 46th European. IEEE pp. 405-408., (10.1109/EuMC.2016.7824365)
- Camarchia, V., Cipriani, E., Colantonio, P., Pirola, M., Quaglia, R., Cabria, L. and Ayllon, N. 2016. Characterization of a high power GaN device for class E PA design with non-sinusoidal stimulus. Presented at: 2016 11th European Microwave Integrated Circuits Conference (EuMIC), London, UK, 3-4 October 2016Microwave Integrated Circuits Conference (EuMIC), 2016 11th European. IEEE pp. 53., (10.1109/EuMIC.2016.7777487)
- Ramella, C., Piacibello, A., Camarchia, V., Pirola, M. and Quaglia, R. 2016. Characterization-oriented design of a compact GaAs MMIC 3-stacked power cell. Presented at: Microwave, Radar and Wireless Communications (MIKON), 2016 21st International Conference on, Krakow, Poland, 9-11 May 2016Microwave, Radar andWireless Communications (MIKON), 2016 21st International Conference on. IEEE, (10.1109/MIKON.2016.7491950)
- Iqbal, M., Camarchia, V., Pirola, M. and Quaglia, R. 2016. A miniaturized wilkinson power divider for ultra wide-band operation. Presented at: 2016 21st International Conference on Microwave, Radar and Wireless Communications (MIKON)2016 21st International Conference on Microwave, Radar and Wireless Communications (MIKON). IEEE, (10.1109/MIKON.2016.7492081)
- Giofre, R. et al. 2015. GaN-MMIC Doherty power amplifier with integrated reconfigurable input network for microwave backhaul applications. Presented at: 2015 IEEE MTT-S International Microwave Symposium (IMS), Phoenix, AZ, 17-22 May 20152015 IEEE MTT-S International Microwave Symposium (IMS). IEEE, (10.1109/MWSYM.2015.7166763)
- Fersch, T. et al. 2015. Stacked GaAs pHEMTs: Design of a K-band power amplifier and experimental characterization of mismatch effects. Presented at: 2015 IEEE MTT-S International Microwave Symposium (IMS), Phoenix, AZ, 17-22 May 20152015 IEEE MTT-S International Microwave Symposium (IMS). IEEE, (10.1109/MWSYM.2015.7166762)
- Camarchia, V. et al. 2013. Bandwidth extension of GaN Doherty power amplifier: Effect on power, efficiency and linearity. Presented at: 2013 IEEE International Wireless Symposium (IWS), Beijing, China, 14-18 April 20132013 IEEE International Wireless Symposium (IWS). IEEE pp. 1-4., (10.1109/IEEE-IWS.2013.6616789)
- Camarchia, V., Fang, J., Ghione, G., Rubio, J. M., Pirola, M. and Quaglia, R. 2012. X-band wideband 5W GaN MMIC power amplifier with large-signal gain equalization. Presented at: 2012 Workshop on Integrated Nonlinear Microwave and Millimetre-wave Circuits, Dublin, Ireland, 3-4 September 20122012 Workshop on Integrated Nonlinear Microwave and Millimetre-wave Circuits. IEEE pp. 1-3., (10.1109/INMMIC.2012.6331935)
- Moreno Rubio, J., Fang, J., Quaglia, R., Camarchia, V., Pirola, M., Donati Guerrieri, S. and Ghione, G. 2011. A 22W 65% efficiency GaN Doherty Power Amplifier at 3.5 GHz for WiMAX applications. Presented at: 2011 Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits, Vienna, Austria, 18-19 April 2011Integrated Nonlinear Microwave and Millimeterwave Circuits, INMMIC, International Workshop on. IEEE pp. 1., (10.1109/INMMIC.2011.5773332)
Research
Contracts
| Title | People | Sponsor | Value | Duration |
|---|---|---|---|---|
|
MUST-RF |
Dr Roberto Quaglia, Prof Paul Tasker, Prof Steve Cripps | EPSRC |
640,890 |
28/04/2025-27/04/2028 |
|
Advancing large signal modelling of high frequency transistors by behavioural and state function model convergence |
Prof Paul Tasker, Dr Roberto Quaglia, Dr Jonathan Lees | CSA Catapult |
135,000 |
01/09/2024-31/08/2026 |
|
AURA |
Dr Roberto Quaglia, Prof Paul Tasker, Dr James Bell, Dr Jonathan Lees, Prof Khaled Elgaid, Dr Abdalla Eblabla | Parallel Wireless, CSA Catapult |
291,617 |
01/04/2024-28/02/2025 |
|
Advancing Control Circuits for Reconfigurable Broadband PAs |
Dr Roberto Quaglia, Prof Steve Cripps, Prof Paul Tasker | Private Company | 61,660 |
01/02/2024-31/12024 |
|
OPTIME-PA: Optimal MMIC design of E-band power amplifiers for Satcom using dedicated measurements and non-linear modelling |
Dr Roberto Quaglia, Prof Tasker | Innovate UK | 48,984 |
09/2023-01/2024 |
|
Broadband Amplifiers with Multiple Operation Modes |
Dr Roberto Quaglia, Prof SC Cripps | Private Company | 20,000 |
01/2022-12/2022 |
|
Linear Broadband Amplifier for Operation with Mismatched Loads |
Dr Roberto Quaglia, Prof SC Cripps | Private Company | 33,471 |
07/2022-12/2022 |
|
Measurement of GaN devices |
Dr Roberto Quaglia | ESA ESTEC | 15,789 |
08/2020-06/2021 |
|
Ka-Band power amplifiers for |
Dr Roberto Quaglia, Prof PJ Tasker | EPSRC IAA | 9,979 |
06/2021-12/2021 |
|
Broadband amplifier for operation |
Dr Roberto Quaglia, Prof SC Cripps | Private Company | 87,759 |
02/2021-02/2022 |
|
Broadband power amplifier design with flat power and efficiency response |
Prof SC Cripps, Dr Roberto Quaglia | Private Company | 52,894 |
11/2019-10/2020 |
|
Experimental characterisation of GaN transistors for load modulated applications with configurable drain bias voltage |
Dr R Quaglia, Dr J Bell, Prof PJ Tasker | Private Company | 81,500 |
10/2019-09/2023 |
|
Advanced broadband reconfigurable amplifiers concepts using novel circuit architectures and operating modes |
Dr R Quaglia, Prof S Cripps | Private Company | 179,433 |
09/2018-06/2019 |
| Non-linear (large signal) millimetre-wave devices, circuits and systems on-wafer characterisation facility | Prof P Tasker, Dr K Elgaid, Dr J Bell, Dr R Quaglia, Prof S Cripps, Prof J Benedikt, Dr J Lees | EPSRC | 1,463,185 |
10/2018-09/2019 |
| Single-chip Ka-band doherty amplifier | Dr Roberto Quaglia | European Space Agency | 70,886 |
06/2018-10/2020 |
| mm-wave power amplifiers for active antenna arrays | Dr R Quaglia, Dr J Lees, Prof S Cripps | Private Company | 73,200 |
11/2018-11/2019 |
| High efficiency power amplifiers for base-stations of the next mobile generation | Dr R Quaglia, Dr J Bell | Private Company | 45,067 |
01/2019-07/2022 |
| High efficiency PA architectures for dual-band operation | Dr R Quaglia, Prof S Cripps | Private Company | 361,202 |
08/2018-11/2020 |
Supervised Students
| Title | Student | Status | Degree |
|---|---|---|---|
| Broadband Techniques for Reconfigurable High-Efficiency PAs | Jean-Baptiste Urvoy | Current | PhD |
|
Reconfigurable power amplifiers for microwave applications |
Aquila Powell | Current | PhD |
|
Wireless power amplifier for |
Kris Yuan | Current | PhD |
| Improvement Of Transmitters Efficiency For Greener Mobile Networks |
Indy van den Heuvel | Current | PhD |
| Microwave reflective tunable termination with high power handling capability |
Seyed Ghozati | Current | PhD |
| Improving Power Amplifier design for bias Configurability | Ehsan Azad | Graduated | PhD |
|
Enhanced mm-wave load-pull for characterisation of CS technology |
Alexander Baddeley | Current | PhD |
| Advanced load modulated power amplifiers for wireless telecom applications |
Derek Kozel | Current | PhD |
Teaching
Undergraduate teaching:
I teach analogue and digital electronics (EN1215/EN1216/EN2178) in the first year to Electronic, Integrated and Medical Engineering students.
Post-Graduate teaching:
I teach CAD and simulation software (ENT672), instrumentation (EN799/EN4089), modelling and measurement of solid state devices (ENT610/EN4910), and high frequency power amplifiers (ENT898) to MSc and MEng students in the areas of Microwave and Wireless, Communication Technologies and Compound Semiconductor Electronics.
I am year tutor for the MSc in these areas.
Biography
I graduated cum laude in Electronic Engineering from Politecnico di Torino in 2008.
I obtained my PhD from Politecnico di Torino, Italy, in 2012, where I have been working on power amplifier design, characterization and linearization.
From 2012 to 2014 I have been a Post-Doc fellow at Politecnico di Torino.
In 2015 I joined Huawei Technologies, where I designed millimetre-wave components for 5G prototypes.
I started my position at Cardiff University in September 2015 with a MSCA Fellowship from the European Union. The 2-year project PADWIC treated theory and techniques in power amplifier design for high frequency telecom applications, based on hybrid and integrated technologies.
In February 2017 I have been appointed as a Lecturer at the Schoool of Engineering of Cardiff University, a role that I started in September 2017.
I am in the review panels of the European Microwave Conferences, and a regular reviewer for the IEEE Transactions on Microwave Theory and Techniques and the IEEE Microwave and Wireless Components Letters.
I am the Deputy Chair of the IEEE Microwave Theory and Techniques Society Technical Committe 12 "Microwave high-power techniques", with which I regularly organize workshops and special session at the main conferences in the sector.
Honours and awards
MTT-S 2024 Award for Best Papaer in the IEEE Microwage Magazine
2009 Young Graduated Research Fellowship presented by the GAAS Association.
2015 Individual Fellowship supported by the European Union in the Marie Sklodowska Curie scheme
Professional memberships
IEEE Member
MTT-S Member
IET Member
Committees and reviewing
I am an elected member of the IEEE MTT Technical Committee MTT-5 MICROWAVE HIGH-POWER TECHNIQUES
I am a reviewer for the EPSRC.
I am a reviewer for the IEEE Transaction on Microwave Theory and Techniques and the IEEE Microwave and Wireless Components Letters. I am in the reviweing board for the European Microwave Week.
Supervisions
I currently supervise 8 PhD students as main supervisor in the areas of high frequency power amplifier design, characterisation and modelling. I also co-supervise other students in similar areas.
I am interested in supervising PhD students in the areas of:
- Power amplifiers design and characterisation
- Microwave and millimetre-wave non-linear characterisation
- System level characterisation, modelling and linearisation
Current supervision
Derek Kozel
Research student
Contact Details
QuagliaR@cardiff.ac.uk
+44 29208 70524
Queen's Buildings - Central Building, Room C/4.13, 5 The Parade, Newport Road, Cardiff, CF24 3AA
Translational Research Hub, Room 0.54, Maindy Road, Cathays, Cardiff, CF24 4HQ
+44 29208 70524
Queen's Buildings - Central Building, Room C/4.13, 5 The Parade, Newport Road, Cardiff, CF24 3AA
Translational Research Hub, Room 0.54, Maindy Road, Cathays, Cardiff, CF24 4HQ
