Browse by Current Cardiff authors

2025. Improved iterative envelope simulation for the efficient prediction of the impact of wideband modulated signals on power amplifier performance. Presented at: 2025 International Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits, Torino, Italy, 10-11 April 2025. Proceedings of the International Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits. IEEE, pp. 1-4. 10.1109/INMMIC64198.2025.10975660

Urvoy, Jean-Baptiste, Quaglia, Roberto

and Cripps, Steve C.

2025. Design and simulation of a Doherty-mode OLMBA for enhanced back-off efficiency over an octave bandwidth. Presented at: 2025 International Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits, Torino, Italy, 10-11 April 2025. Proceedings of the International Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits. IEEE, pp. 1-4. 10.1109/INMMIC64198.2025.10975674

Jones, Jake, Jones, Nick, Choi, Heungjae

, Cripps, Steve

and Porch, Adrian

2025. A novel microwave applicator for large volume metal powder heating in additive manufacturing. Presented at: APMC 2024, Bali, Indonesia, 17-20 November 2024. 2024 IEEE Asia-Pacific Microwave Conference (APMC). IEEE, pp. 1302-1304. 10.1109/apmc60911.2024.10867661

Silver, Kai, Choi, Heungjae

, Smith, Ron, Jones, Martin O., Richards, Emma

and Porch, Adrian

2025. A novel miniaturized benchtop EPR spectrometer based on sideband detection using a software-defined radio. Presented at: APMC 2024, Bali, Indonesia, 17-20 November 2024. 2024 IEEE Asia-Pacific Microwave Conference (APMC). IEEE, pp. 814-816. 10.1109/apmc60911.2024.10867565
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Silver, Kai, Choi, Heungjae

, Smith, Ron, Jones, Martin O., Richards, Emma, Murphy, Damien

and Porch, Adrian 2025. Design considerations for an electron paramagnetic resonance spectrometer for simultaneous epr and neutron diffraction. Presented at: AMPERE 2025 20th Inttetional Conference on Microwave and High Frequency Applications, Bari, Italy, 15-19 September 2025.

Powell, Aquila G., Quaglia, Roberto

, Powell, Jeff and Cripps, Steve 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 2024. 2024 19th European Microwave Integrated Circuits Conference (EuMIC). IEEE, pp. 275-278. 10.23919/eumic61603.2024.10732591

van den Heuvel, Indy, Azad, Ehsan M., Omisakin-Edwards, Mark, Cripps, Steve C.

and Quaglia, Roberto

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, Aleksander, Li, Wantao, Lees, Jonathan

, Montoro, Gabriel, Gilabert, Pere L. and Cripps, Steve

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

Jones, Dafydd, Cripps, Steve

, Choi, Heungjae

, Perks, Richard

, Porch, Adrian

and Brown, Phill 2024. Novel oscillator for use in near-field microwave microscopy. Presented at: Asia-Pacific Microwave Conference (APMC), 05-08 December 2023. Proceedings 2023 Asia-Pacific Microwave Conference (APMC). IEEE, pp. 829-831. 10.1109/APMC57107.2023.10439775

Tian, Mengyue, Urvoy, Jean-Baptiste, Powell, Jeff, Bell, James J.

and Quaglia, Roberto

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 2024. Proceedings Topical Conference on RF/Microwave Power Amplifiers for Radio and Wireless Applications (PAWR) 2024. IEEE, pp. 17-20. 10.1109/PAWR59907.2024.10438664

Quaglia, Roberto

, Cripps, Steve

and Powell, Jeff 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 2024. Proceedings Topical Conference on RF/Microwave Power Amplifiers for Radio and Wireless Applications (PAWR) 2024. IEEE, pp. 28-30. 10.1109/PAWR59907.2024.10438584

Van Den Heuvel, Indy, Quaglia, Roberto

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 2023. 2023 International Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits (INMMIC). IEEE, 10.1109/INMMIC57329.2023.10321784

Yuan, Tonghui, Quaglia, Roberto

, Chaudhry, Kauser, Azad, Ehsan, Powell, Jeff R. and Cripps, Steve 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, Jean-Baptiste, Quaglia, Roberto

, Powell, Jeff R. and Cripps, Steve 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 2023. Proceedings of 53rd European Microwave Conference. IEEE, pp. 267-270. 10.23919/EuMC58039.2023.10290592

Cripps, Steve C.

2023. Swapping tales [Microwave Bytes]. IEEE Microwave Magazine 24 (10) , pp. 68-72. 10.1109/MMM.2023.3294879

Jones, D. R., Brown, P., McFarland, G., Perks, R.

, Choi, H.

, Cripps, S.

and Porch, A.

2023. Near-field microwave microscopy for 3D surface assessment of manufactured structures. IEEE Journal of Microwaves 3 (3) , pp. 962-969. 10.1109/JMW.2023.3261901

Li, Wantao, Bogusz, Aleksander, Lees, Jonathan

, Cripps, Steve

, Montoro, Gabriel and Gilabert, Pere 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 2023. Proceedings of the 2023 IEEE/MTT-S International Microwave Symposium (IMS). IEEE, pp. 203-206. 10.1109/IMS37964.2023.10188039

Ghozati, Seyed U.

, Azad, Ehsan, Powell, Jeff, Tasker, Paul

and Cripps, Steve

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.

Cripps, Steve C.

2022. Still a-masing [microwave bytes]. IEEE Microwave Magazine 24 (1) , pp. 16-20. 10.1109/MMM.2022.3203943

Quaglia, Roberto

, Pang, Jingzhou, Cripps, Steve C.

and Zhu, Anding 2022. Load-modulated balanced amplifier: from first invention to recent development. IEEE Microwave Magazine 23 (12) , pp. 60-70. 10.1109/MMM.2022.3203940

Cripps, Steve C.

2022. Phasing out [microwave bytes]. IEEE Microwave Magazine 23 (8) , pp. 18-22. 10.1109/MMM.2022.3173068

Quaglia, Roberto

, Powell, Jeffrey R., Chaudhry, Kauser and Cripps, Steve 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

Cripps, Steve C.

2022. Moving goalposts [microwave bytes]. IEEE Microwave Magazine 23 (5) , pp. 20-25. 10.1109/MMM.2022.3148151

Quaglia, Roberto

, Powell, Jeff, Chaudhry, Kauser and Cripps, Steve

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 2022. 2022 International Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits (INMMiC). IEEE, pp. 1-3. 10.1109/INMMiC54248.2022.9762184

Cripps, Steve C.

2022. Tuning up [microwave bytes]. IEEE Microwave Magazine 23 (2) , pp. 16-54. 10.1109/MMM.2021.3125471

Cripps, Steve C.

2021. Clipper classes [microwave bytes]. IEEE Microwave Magazine 22 (12) , pp. 16-29. 10.1109/MMM.2021.3109499

Cripps, Steve C.

2021. Vacuous soundings [microwave bytes]. IEEE Microwave Magazine 22 (10) , pp. 15-20. 10.1109/MMM.2021.3095699

Cripps, Steve C.

2021. Iconic circles [microwave bytes]. IEEE Microwave Magazine 22 (7) , pp. 17-22. 10.1109/MMM.2021.3069605

Rubio, Jorge Julian Moreno, Quaglia, Roberto

, Piacibello, Anna, Camarchia, Vittorio, Tasker, Paul J.

and Cripps, Steve

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

Cripps, Steve C.

2021. Canned electromagnetics [microwave bytes]. IEEE Microwave Magazine 22 (5) , pp. 19-23. 10.1109/MMM.2021.3056972

Cripps, Steve C.

2021. Coupling factors [microwave bytes]. IEEE Microwave Magazine 22 (3) , pp. 12-87. 10.1109/MMM.2020.3042578

Cripps, Steve C.

2021. Cultural interference [microwave bytes]. IEEE Microwave Magazine 22 (1) , pp. 12-98. 10.1109/MMM.2020.3027941

Cripps, Steve C.

2020. Pushing and pulling [microwave bytes]. IEEE Microwave Magazine 21 (10) , pp. 14-18. 10.1109/MMM.2020.3008306

Collins, David J., Quaglia, Roberto

, Powell, Jeff and Cripps, Stephen

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, Jorge

, Baddeley, Alexander, Tasker, Paul

and Cripps, Stephen

2020. Design of a broadband power amplifier based on power and efficiency contours estimation. IEEE Microwave and Wireless Components Letters 30 (8) , 772 -774. 10.1109/LMWC.2020.3005833

Bogusz, Aleksander, Lees, Jonathan

, Watkins, Gareth and Cripps, Steve

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

Cappello, Tommaso, Pednekar, Prathamesh, Florian, Corrado, Cripps, Steve

, Popovic, Zoya and Barton, Taylor W. 2019. Supply- and load-modulated balanced amplifier for efficient broadband 5G base stations. IEEE Transactions on Microwave Theory and Techniques 67 (7) , pp. 3122-3133. 10.1109/TMTT.2019.2915082

Quaglia, Roberto

, Greene, Mark D., Poulton, Matthew J. and Cripps, Steve 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

Bogusz, Aleksander, Lees, Jonathan

, Watkins, Gavin T. and Cripps, Steve

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, pp. 1-3. 10.1109/IMC-5G47857.2019.9160351

Parker, Nyle, Hefford, Samuel, Lees, Jonathan, Cripps, Stephen

and Porch, Adrian

2019. A novel VHF heating system to aid selective laser melting. Presented at: 2019 IEEE MTT-S International Microwave Symposium, IMS 2019, Boston, USA, 2 -7 June 2019. -.

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, Roberto

and Cripps, Steve

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

Collins, David, Quaglia, Roberto

, Powell, Jeff and Cripps, Stephen

2018. Experimental characterization of a load modulated balanced amplifier with simplified input power splitter. Presented at: APMC 2018, Kyoto, Japan, 6-9 Nov 2018.

Bogusz, Aleksander, Costello, Zack,, Quaglia, Roberto

, Bell, James

, Lees, Jonathan

and Cripps, Stephen

2018. Power and efficiency continuous modes in saturated GaN HEMT devices. Presented at: Inmmic 2018, Brive-La-Gaillarde, France, 5- 6 July 2018.

Quaglia, Roberto

, Bell, James J.

and Cripps, Steve

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

Shepphard, Daniel J., Powell, Jeffrey and Cripps, Steve C.

2017. A broadband reconfigurable load modulated balanced amplifier (LMBA). Presented at: IEEE MTT-S International Microwave Symposium (IMS), Honololu, HI, USA, 4-9 June 2017. 2017 IEEE MTT-S International Microwave Symposium (IMS). IEEE, pp. 943-945. 10.1109/MWSYM.2017.8058743

Quaglia, Roberto

, Shepphard, Daniel J. and Cripps, Steve

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

Cripps, Steve C.

2017. Great Equations? [Microwave Bytes]. IEEE Microwave Magazine 18 (2) , pp. 24-27. 10.1109/MMM.2016.2635924

Quaglia, Roberto

2017. Harmonic clipping contours: numerical computation and extension to higher harmonics. Presented at: European Microwave Conference, London, UK, 3-7 Oct. 2016. Microwave Conference (EuMC), 2016 46th European. IEEE, pp. 405-408. 10.1109/EuMC.2016.7824365

Smith, R. M. H. and Cripps, Stephen Charles

2017. Broadband push-pull power amplifier design at microwave frequencies. Presented at: 2016 46th European Microwave Conference (EuMC), 4-6 October 2016. 2016 46th European Microwave Conference (EuMC). IEEE, pp. 1353-1356. 10.1109/EuMC.2016.7824603

Al-Ziayree, Ali Mahdi Lafta, Perks, Richard Marc

2017. A 25 µm spatial resolution broadband microwave voltage probe. Presented at: 2016 International Conference for Students on Applied Engineering (ICSAE), Newcastle upon Tyne, UK, 20-21 October 2016. International Conference for Students on Applied Engineering (ICSAE). IEEE, pp. 7-11. 10.1109/ICSAE.2016.7810152

Yusoff, Zubaida, Annuar, Fatahiyah Mohd, Kung, Fabian, Hashim, Shaiful Jahari, Lees, Jonathan

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

Al-Ziayree, Ali Mahdi Lafta, Cripps, Stephen Charles

and Perks, Richard Marc

2016. A novel microwave non contact current probe with high spatial resolution. Presented at: 2016 IEEE MTT-S International Microwave Symposium (IMS), San Francisco, CA, USA, 22-27 May 2016. 2016 IEEE MTT-S International Microwave Symposium (IMS). IEEE Xplore. IEEE, pp. 1-3. 10.1109/MWSYM.2016.7540265

Shepphard, Daniel, Powell, Jeffrey and Cripps, Steve C.

2016. An efficient broadband reconfigurable power amplifier using active load modulation. IEEE Microwave and Wireless Components Letters 26 (6) , pp. 443-445. 10.1109/LMWC.2016.2559503

Powell, J. R., Shepphard, Daniel and Cripps, Stephen Charles

2016. High efficiency GaN 2.5 to 9 GHz power amplifiers realized in multilayer LCP hybrid technology. IEEE Microwave and Wireless Components Letters 26 (6) , pp. 440-442. 10.1109/LMWC.2016.2559502

Loescher, David, Tasker, Paul

and Cripps, Stephen

2016. Using waveform engineering to understand the impact of harmonic terminations during 5:1 VSWR stress tests. Presented at: Power Amplifiers for Wireless and Radio Applications (PAWR), 2016 IEEE Topical Conference on, Austin, TX, USA, 24-27 Jan. 2016. 2016 IEEE Topical Conference on Power Amplifiers for Wireless and Radio Applications (PAWR). IEEE, pp. 49-52. 10.1109/PAWR.2016.7440161

Cripps, Stephen Charles

2015. Behavioral swing [microwave bytes]. IEEE Microwave Magazine 16 (10) , pp. 20-25. 10.1109/MMM.2015.2465714

Cripps, Stephen Charles

2015. Intermodulation squared response [Microwave bytes]. IEEE Microwave Magazine 16 (5) , pp. 102-106. 10.1109/MMM.2015.2410617

Dehghan, N. and Cripps, Stephen Charles

2015. A novel in-situ calibration technique for a high resolution E-Field probe. Presented at: 2015 IEEE MTT-S International Microwave Symposium, Phoenix, AZ, USA, 17-22 May 2015. 2015 IEEE MTT-S International Microwave Symposium. IEEE, pp. 1-3.

Cripps, Stephen Charles

2015. The evolution of the push-pull RFPA. Presented at: 2015 IEEE MTT-S International Microwave Symposium, Phoenix, AZ, USA, 17-22 May 2015. 2015 IEEE MTT-S International Microwave Symposium. 2015 IEEE MTT-S International Microwave Symposium. IEEE, pp. 1-4.

Canning, Tim, Powell, Jeff R. and Cripps, Steve C.

2014. Optimal design of broadband microwave baluns using single-layer planar circuit technology. IEEE Transactions on Microwave Theory and Techniques 62 (5) , pp. 1183-1191. 10.1109/TMTT.2014.2311417

Canning, Timothy A. J., Tasker, Paul J.

and Cripps, Steven Charles

2014. Continuous mode power amplifier design using harmonic clipping contours: theory and practice. IEEE Transactions on Microwave Theory and Techniques 62 (1) , pp. 100-110. 10.1109/TMTT.2013.2292675

Haynes, Mervin, Tasker, Paul J.

2013. High efficiency PA design strategy at X-Band. Presented at: 2013 IEEE Compound Semiconductor Integrated Circuit Symposium (CSICS), Monterey, CA, USA, 13-16 October 2013. Compound Semiconductor Integrated Circuit Symposium (CSICS), 2013 IEEE. IEEE, pp. 1-4. 10.1109/CSICS.2013.6659232

Canning, Timothy A. J., Tasker, Paul J.

2013. Load Pull verification of a novel Class B/J design tool: Second harmonic clipping contours. Presented at: 81 st ARFTG Microwave Measurement Conference, Seattle, WA, USA, 7 June 2013. Microwave Measurement Conference (ARFTG), 2013 81st ARFTG. IEEE, pp. 1-3. 10.1109/ARFTG.2013.6579040

Canning, Timothy A. J., Tasker, Paul J.

2013. Waveform evidence of gate harmonic short circuit benefits for high efficiency x-band power amplifiers. IEEE Microwave and Wireless Components Letters 23 (8) , pp. 439-441. 10.1109/LMWC.2013.2272317

Yusoff, Zubaida, Lees, Jonathan

, Chaudhary, Muhammad Akmal, Carrubba, Vincenzo, Choi, Heungjae

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

Smith, R. M., Lees, Jonathan

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

Carrubba, V., Quay, R., Schlechtweg, M., Ambacher, O., Akmal, M., Lees, Jonathan

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, Vincenzo, Akmal, Muhammad, Quay, Rüdiger, Lees, Jonathan

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

Smith, Robert Martin, Lees, Jonathan

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, Paul J.

, Carrubba, Vincenzo, Wright, P., Lees, Jonathan

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. Compound Semiconductor Integrated Circuit Symposium (CSICS), 2012 IEEE. IEEE, pp. 1-4. 10.1109/CSICS.2012.6340048

Carrubba, Vincenzo, Clarke, Alan Leslie, Akmal, Muhammad, Lees, Jonathan

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

Yusoff, Zubaida Binti, Akmal, Muhammad, Carrubba, Vincenzo, Lees, Jonathan

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

Carrubba, Vincenzo, Lees, Jonathan

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, Zubaida Binti, Lees, Jonathan

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, Peter, Remley, Kate, Tzuang, C. and Ponchak, George eds. 2011 IEEE/MTT-S International Microwave Symposium - MTT 2011. New York: IEEE, pp. 1752-1755. 10.1109/MWSYM.2011.5972769

Almuhaisen, Abdullah, Lees, Jonathan

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.

Carrubba, Vincenzo, Clarke, Alan Leslie, Akmal, Muhammad, Yusoff, Zubaida Binti, Lees, Jonathan

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.

Canning, Timothy A. J., Almuhaisen, Abdullah, Lees, Jonathan

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, Vincenzo, Clarke, Alan Leslie, Woodington, Simon P., McGenn, William, Akmal, Muhammad, Almuhaisen, Abdullah, Lees, Jonathan

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, Dominic, Saini, Randeep, Lees, Jonathan

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

Smith, Robert Martin, Cripps, Stephen Charles

and Lees, Jonathan

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, Peter, Remley, Kate, Tzuang, C. and Ponchak, George eds. 2011 IEEE/MTT-S International Microwave Symposium - MTT 2011. New York: IEEE, pp. 1204-1208. 10.1109/MWSYM.2011.5972702

Bell, James Joseph

, Saini, Randeep, Woodington, Simon Philip, Lees, Jonathan

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

Powell, J. R., Uren, Michael John, Martin, T., McLachlan, A., Tasker, Paul J.

, Bell, James Joseph

, Saini, Randeep, Woodington, Simon Philip, Benedikt, Johannes

2011. GaAs X-band high efficiency (65%) broadband (30%) amplifier MMIC based on the Class B to Class J continuum. Presented at: 2011 IEEE/MTT-S International Microwave Symposium, Baltimore, MD, USA, 5-10 June 2011. Published in: Seigel, Peter, Remley, Kate, Tzuang, C. and Ponchak, George eds. 2011 IEEE/MTT-S International Microwave Symposium - MTT 2011. New York: IEEE, p. 355. 10.1109/MWSYM.2011.5973350

FitzPatrick, D. M., Williams, T., Lees, Jonathan

and Tasker, Paul

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

Mashad Nemati, Hossein, Clarke, Alan Leslie, Cripps, Stephen Charles

, Fager, Christian, Grahn, Jan and Zirath, Herbert 2010. Evaluation of a GaN HEMT transistor for load- and supply-modulation applications using intrinsic waveform measurements. Presented at: IEEE MTT 2010 International Microwave Symposium, Anaheim, CA, USA, 23-28 May 2010. 2010 IEEE MTT-S International Microwave Symposium Digest (MTT 2010). Piscataway, NJ: IEEE, pp. 509-512. 10.1109/MWSYM.2010.5517696

Almuhaisen, Abdullah, Wright, Peter Thomas, Lees, Jonathan

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

Carrubba, V., Clarke, A. L., Akmal, M., Lees, Jonathan

2010. The continuous Class-F Mode mode power amplifier. Presented at: European Microwave Conference (EuMC) 2010, Paris, France, (561630) pp. 1674-1677.

Cripps, Stephen Charles

and Porch, Adrian

2010. An active, non-intrusive, high resolution microwave field probe with applications in high power RF device and circuit design. Presented at: 2010 IEEE 11th Annual Wireless and Microwave Technology Conference (WAMICON 2010), Melbourne Beach, USA, (546185)

Akmal, M., Lees, Jonathan

, Bensmida, S., Woodington, S., Carrubba, V., Cripps, Stephen Charles

, Morris, K., Beach, M., McGeehan, J. and Tasker, Paul

2010. The effect of baseband impedance termination on the linearity of GaN HEMTs. Presented at: European Microwave Conference 2010, Paris, France, (561636) pp. 1046-1049.

Wright, P., Lees, Jonathan

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

Cripps, Stephen Charles

, Clarke, A. L., Lees, Jonathan

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

Wright, Peter Thomas, Lees, Jonathan

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

Cripps, Steve

2008. Trapwave Inc. [Microwave Bytes]. IEEE Microwave Magazine 9 (4) , pp. 46-51. 10.1109/MMM.2008.924789

Lees, Jonathan

, Williams, T., Woodington, S., McGovern, P., Cripps, Stephen Charles