Yr Athro Steve Cripps

Distinguished Research Professor

Yr Ysgol Peirianneg

: CrippsSC@caerdydd.ac.uk
: +44 29208 74267

Electrical & Electronic Engineering
Health, Technology and the Digital World

Date
Type

2024

Jones, D., Cripps, S., Choi, H., Perks, R., Porch, A. and Brown, P. 2024. Novel oscillator for use in near-field microwave microscopy. Presented at: Asia-Pacific Microwave Conference (APMC), 05-08 December 2023Proceedings 2023 Asia-Pacific Microwave Conference (APMC). IEEE pp. 829-831., (10.1109/APMC57107.2023.10439775)
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)

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)
Cripps, S. 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, 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.

2022

Cripps, S. C. 2022. Still a-masing [microwave bytes]. IEEE Microwave Magazine 24(1), pp. 16-20. (10.1109/MMM.2022.3203943)
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)
Cripps, S. C. 2022. Phasing out [microwave bytes]. IEEE Microwave Magazine 23(8), pp. 18-22. (10.1109/MMM.2022.3173068)
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)
Cripps, S. C. 2022. Moving goalposts [microwave bytes]. IEEE Microwave Magazine 23(5), pp. 20-25. (10.1109/MMM.2022.3148151)
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)
Cripps, S. C. 2022. Tuning up [microwave bytes]. IEEE Microwave Magazine 23(2), pp. 16-54. (10.1109/MMM.2021.3125471)

2021

Cripps, S. C. 2021. Clipper classes [microwave bytes]. IEEE Microwave Magazine 22(12), pp. 16-29. (10.1109/MMM.2021.3109499)
Cripps, S. C. 2021. Vacuous soundings [microwave bytes]. IEEE Microwave Magazine 22(10), pp. 15-20. (10.1109/MMM.2021.3095699)
Cripps, S. C. 2021. Iconic circles [microwave bytes]. IEEE Microwave Magazine 22(7), pp. 17-22. (10.1109/MMM.2021.3069605)
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)
Cripps, S. C. 2021. Canned electromagnetics [microwave bytes]. IEEE Microwave Magazine 22(5), pp. 19-23. (10.1109/MMM.2021.3056972)
Cripps, S. C. 2021. Coupling factors [microwave bytes]. IEEE Microwave Magazine 22(3), pp. 12-87. (10.1109/MMM.2020.3042578)
Cripps, S. C. 2021. Cultural interference [microwave bytes]. IEEE Microwave Magazine 22(1), pp. 12-98. (10.1109/MMM.2020.3027941)

2020

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

2019

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)
Cappello, T., Pednekar, P., Florian, C., Cripps, S., Popovic, Z. and Barton, T. 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, 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)
Parker, N., Hefford, S., Lees, J., Cripps, S. and Porch, A. 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. pp. -.
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

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)
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

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)
Shepphard, D. J., Powell, J. and Cripps, S. 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 20172017 IEEE MTT-S International Microwave Symposium (IMS). IEEE pp. 943-945., (10.1109/MWSYM.2017.8058743)
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)
Cripps, S. C. 2017. Great Equations? [Microwave Bytes]. IEEE Microwave Magazine 18(2), pp. 24-27. (10.1109/MMM.2016.2635924)
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)
Smith, R. M. H. and Cripps, S. C. 2017. Broadband push-pull power amplifier design at microwave frequencies. Presented at: 2016 46th European Microwave Conference (EuMC), 4-6 October 20162016 46th European Microwave Conference (EuMC). IEEE pp. 1353-1356., (10.1109/EuMC.2016.7824603)
Al-Ziayree, A. M. L., Perks, R. M. and Cripps, S. C. 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 2016International Conference for Students on Applied Engineering (ICSAE). IEEE pp. 7-11., (10.1109/ICSAE.2016.7810152)

2016

Yusoff, Z., Annuar, F. M., Kung, F., Hashim, S. J., Lees, J. and Cripps, S. C. 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 20162016 IEEE International Conference on Semiconductor Electronics (ICSE). IEEE pp. 344-347., (10.1109/SMELEC.2016.7573662)
Al-Ziayree, A. M. L., Cripps, S. C. and Perks, R. M. 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 20162016 IEEE MTT-S International Microwave Symposium (IMS). IEEE pp. 1-3., (10.1109/MWSYM.2016.7540265)
Shepphard, D., Powell, J. and Cripps, S. 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, D. and Cripps, S. C. 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, D., Tasker, P. and Cripps, S. 2016. Using waveform engineering to understand the impact of harmonic terminations during 5:1 VSWR stress tests. Presented at: Power Amplifiers for Wireless and Radio Applications (PAWR), 2016 IEEE Topical Conference on, Austin, TX, USA, 24-27 Jan. 20162016 IEEE Topical Conference on Power Amplifiers for Wireless and Radio Applications (PAWR). IEEE pp. 49-52., (10.1109/PAWR.2016.7440161)

2015

Cripps, S. C. 2015. Behavioral swing [microwave bytes]. IEEE Microwave Magazine 16(10), pp. 20-25. (10.1109/MMM.2015.2465714)
Cripps, S. C. 2015. Intermodulation squared response [Microwave bytes]. IEEE Microwave Magazine 16(5), pp. 102-106. (10.1109/MMM.2015.2410617)
Cripps, S. C. 2015. The evolution of the push-pull RFPA. Presented at: 2015 IEEE MTT-S International Microwave Symposium, Phoenix, AZ, USA, 17-22 May 20152015 IEEE MTT-S International Microwave Symposium. IEEE pp. 1-4.
Dehghan, N. and Cripps, S. C. 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 20152015 IEEE MTT-S International Microwave Symposium. IEEE pp. 1-3.

2014

Canning, T., Powell, J. R. and Cripps, S. 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, T. A. J., Tasker, P. J. and Cripps, S. C. 2014. Continuous mode power amplifier design using harmonic clipping contours: theory and practice. IEEE Transactions on Microwave Theory and Techniques 62(1), pp. 100-110. (10.1109/TMTT.2013.2292675)

2013

Yusoff, Z., Lees, J., Chaudhary, M. A., Carrubba, V., Choi, H., Tasker, P. J. and Cripps, S. C. 2013. Simple and low-cost tracking generator design in envelope tracking radio frequency power amplifier system for WCDMA applications. IET Microwaves, Antennas & Propagation 7(10), pp. 802-808. (10.1049/iet-map.2013.0091)
Canning, T. A. J., Tasker, P. J. and Cripps, S. C. 2013. Waveform evidence of gate harmonic short circuit benefits for high efficiency x-band power amplifiers. IEEE Microwave and Wireless Components Letters 23(8), pp. 439-441. (10.1109/LMWC.2013.2272317)
Canning, T. A. J., Tasker, P. J. and Cripps, S. C. 2013. Load Pull verification of a novel Class B/J design tool: Second harmonic clipping contours. Presented at: 81 st ARFTG Microwave Measurement Conference, Seattle, WA, USA, 7 June 2013Microwave Measurement Conference (ARFTG), 2013 81st ARFTG. IEEE pp. 1-3., (10.1109/ARFTG.2013.6579040)
Haynes, M., Tasker, P. J. and Cripps, S. C. 2013. High efficiency PA design strategy at X-Band. Presented at: 2013 IEEE Compound Semiconductor Integrated Circuit Symposium (CSICS), Monterey, CA, USA, 13-16 October 2013Compound Semiconductor Integrated Circuit Symposium (CSICS), 2013 IEEE. IEEE pp. 1-4., (10.1109/CSICS.2013.6659232)

2012

Carrubba, V., Akmal, M., Quay, R., Lees, J., Benedikt, J., Cripps, S. C. and Tasker, P. J. 2012. The Continuous Inverse Class-F Mode With Resistive Second-Harmonic Impedance. IEEE Transactions on Microwave Theory and Techniques 60(6), pp. 1928-1936. (10.1109/TMTT.2012.2189228)
Carrubba, V. et al. 2012. Continuous-ClassF3 power amplifier mode varying simultaneously first 3 harmonic impedances. Presented at: 2012 IEEE MTT-S International Microwave Symposium Digest, Montreal, Canada, 17-22 June 2012Microwave Symposium Digest (MTT), 2012 IEEE MTT-S International. IEEE pp. 1-3., (10.1109/MWSYM.2012.6258343)
Smith, R. M., Lees, J., Tasker, P. J., Benedikt, J. and Cripps, S. C. 2012. A 40W push-pull power amplifier for high efficiency, decade bandwidth applications at microwave frequencies. Presented at: 2012 IEEE MTT-S International Microwave Symposium Digest (MTT, Montreal, Canada, 17-22 June 2012Microwave Symposium Digest (MTT), 2012 IEEE MTT-S International. IEEE pp. 1-3., (10.1109/MWSYM.2012.6259418)
Smith, R. M., Lees, J., Tasker, P. J., Benedikt, J. and Cripps, S. C. 2012. A Novel Formulation for High Efficiency Modes in Push-Pull Power Amplifiers Using Transmission Line Baluns. IEEE Microwave and Wireless Components Letters 22(5), pp. 257-259. (10.1109/LMWC.2012.2191273)
Tasker, P. J., Carrubba, V., Wright, P., Lees, J., Benedikt, J. and Cripps, S. C. 2012. Wideband PA design: The "continuous" mode of operation. Presented at: Compound Semiconductor Integrated Circuit Symposium (CSICS), La Jolla, CA, USA, 14-17 October 2012Compound Semiconductor Integrated Circuit Symposium (CSICS), 2012 IEEE. IEEE pp. 1-4., (10.1109/CSICS.2012.6340048)

2011

Carrubba, V., Clarke, A. L., Akmal, M., Lees, J., Benedikt, J., Tasker, P. J. and Cripps, S. C. 2011. On the extension of the continuous class-F mode power amplifier. IEEE Transactions on Microwave Theory and Techniques 59(5), pp. 1294-1303. (10.1109/TMTT.2011.2117435)
Yusoff, Z. B., Akmal, M., Carrubba, V., Lees, J., Benedikt, J., Tasker, P. J. and Cripps, S. C. 2011. The benefit of GaN characteristics over LDMOS for linearity improvement using drain modulation in power amplifier system. Presented at: 2011 Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits, Vienna, Austria, 18-19 April 20112011 Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits (INMMIC 2011). New York: IEEE pp. 109-112., (10.1109/INMMIC.2011.5773334)
Carrubba, V., Lees, J., Benedikt, J., Tasker, P. J. and Cripps, S. C. 2011. A novel highly efficient broadband continuous class-F RFPA delivering 74% average efficiency for an octave bandwidth. Presented at: 2011 IEEE/MTT-S International Microwave Symposium, Baltimore, MD, USA, 5-10 June 20112011 IEEE/MTT-S International Microwave Symposium - MTT 2011. New York: IEEE pp. 350-353., (10.1109/MWSYM.2011.5972701)
Yusoff, Z. B., Lees, J., Benedikt, J., Tasker, P. J. and Cripps, S. C. 2011. Linearity improvement in RF power amplifier system using integrated Auxiliary Envelope Tracking system. Presented at: 2011 IEEE/MTT-S International Microwave Symposium, Baltimore, MD, USA, 5-10 June 2011 Presented at Seigel, P. et al. eds.2011 IEEE/MTT-S International Microwave Symposium - MTT 2011. New York: IEEE pp. 1752-1755., (10.1109/MWSYM.2011.5972769)
FitzPatrick, D., Saini, R., Lees, J., Benedikt, J., Cripps, S. C. and Tasker, P. J. 2011. A waveform engineering approach to the design of improved efficiency wideband MMIC amplifiers. Presented at: Wireless and Microwave Technology Conference (WAMICON), 2011 IEEE 12th Annual., Clearwater Beach, FL, USA, 18-19 April 20112011 IEEE 12th Annual Wireless and Microwave Technology Conference (WAMICON), Clearwater Beach, FL, 18-19 April 2011. Los Alamitos, CA: IEEE pp. 225-230., (10.1109/WAMICON.2011.5872859)
Smith, R. M., Cripps, S. C., Tasker, P. J., Benedikt, J. and Lees, J. 2011. A design methodology for the realization of multi-decade baluns at microwave frequencies. Presented at: 2011 IEEE/MTT-S International Microwave Symposium, Baltimore, MD, USA, 5-10 June 2011 Presented at Seigel, P. et al. eds.2011 IEEE/MTT-S International Microwave Symposium - MTT 2011. New York: IEEE pp. 1204-1208., (10.1109/MWSYM.2011.5972702)
Bell, J. J., Saini, R., Woodington, S. P., Lees, J., Benedikt, J., Cripps, S. C. and Tasker, P. J. 2011. Behavioral model analysis using simultaneous active fundamental load-pull and harmonic source-pull measurements at X-band. Presented at: 2011 IEEE/MTT-S International Microwave Symposium, Baltimore, MD, USA, 5-10 June 2011Microwave Symposium Digest (MTT), 2011 IEEE MTT-S International. New York: IEEE pp. 982-986., (10.1109/MWSYM.2011.5972803)
Powell, J. R. et al. 2011. GaAs X-band high efficiency (65%) broadband (30%) amplifier MMIC based on the Class B to Class J continuum. Presented at: 2011 IEEE/MTT-S International Microwave Symposium, Baltimore, MD, USA, 5-10 June 2011 Presented at Seigel, P. et al. eds.2011 IEEE/MTT-S International Microwave Symposium - MTT 2011. New York: IEEE pp. 355., (10.1109/MWSYM.2011.5973350)
Carrubba, V. et al. 2011. High-speed device characterization using an active load-pull system and waveform engineering postulator. Presented at: 2011 77th ARFTG Microwave Measurement Conference (ARFTG), Baltimore, MD, USA, 10 June 2011Design and Measurement of Microwave Systems - Proceedings of the 2011 77th ARFTG Microwave Measurement Conference (ARFTG). Los Alamitos, CA: IEEE, (10.1109/ARFTG77.2011.6034553)
Canning, T. A. J., Almuhaisen, A., Lees, J., Benedikt, J., Cripps, S. C. and Tasker, P. J. 2011. Utilization of RF I-V waveform load-pull information to identify the role FET knee profile has on locating the efficiency maxima. Presented at: 2011 78th ARFTG Microwave Measurement Symposium (ARFTG), Tempe, AZ, USA, 1-2 December 2011Proceedings of the 2011 78th ARFTG Microwave Measurement Symposium (ARFTG) - High Power RF Measurement Techniques. Los Alamitos, CA: IEEE, (10.1109/ARFTG78.2011.6183864)
Carrubba, V. et al. 2011. Exploring the Design Space for Broadband PAs using the Novel "Continuous Inverse Class-F Mode". Presented at: 6th European Microwave Integrated Circuits Conference (EuMIC) 2011, Manchester, UK, 10-11 October 2011Proceedings of the 41st European Microwave Conference (EuMC). IEEE pp. 333-336.
Almuhaisen, A., Lees, J., Cripps, S. C., Tasker, P. J. and Benedikt, J. 2011. Wide band high-efficiency power amplifier design. Presented at: 6th European Microwave Integrated Circuits Conference (EuMIC) 2011, Manchester, UK, 10-11 October 2011Proceedings of the 6th European Microwave Integrated Circuits Conference (EuMIC). Los Alamitos, CA: IEEE pp. 184-187.

2010

Akmal, M. et al. 2010. The effect of baseband impedance termination on the linearity of GaN HEMTs. Presented at: European Microwave Conference 2010, Paris, France. Vol. 561636. pp. 1046-1049.
Mashad Nemati, H. et al. 2010. Evaluation of a GaN HEMT transistor for load- and supply-modulation applications using intrinsic waveform measurements. Presented at: IEEE MTT 2010 International Microwave Symposium, Anaheim, CA, USA, 23-28 May 20102010 IEEE MTT-S International Microwave Symposium Digest (MTT 2010). Piscataway, NJ: IEEE pp. 509-512., (10.1109/MWSYM.2010.5517696)
Almuhaisen, A., Wright, P. T., Lees, J., Tasker, P. J., Cripps, S. C. and Benedikt, J. 2010. Novel wide band high-efficiency active harmonic injection power amplifier concept. Presented at: IEEE MTT-S International Microwave Symposium, Anaheim, CA, USA, 23-28 May 20102010 IEEE MTT-S International Microwave Symposium Digest (MTT 2010). New York: IEEE pp. 664-667., (10.1109/MWSYM.2010.5514759)
FitzPatrick, D. M., Williams, T., Lees, J., Benedikt, J., Cripps, S. C. and Tasker, P. 2010. Exploitation of active load-pull and DLUT models in MMIC design. Presented at: IEEE Radio Frequency Integrated Circuits Symposium, Anaheim, CA, USA, 23-25 May 2010Proceedings of the 2010 IEEE Radio Frequency Integrated Circuits Symposium May 23-25, 2010, Anaheim, California, USA. Piscataway, NJ: IEEE pp. 487-490., (10.1109/RFIC.2010.5477406)
Carrubba, V., Clarke, A. L., Akmal, M., Lees, J., Benedikt, J., Tasker, P. and Cripps, S. C. 2010. The continuous Class-F Mode mode power amplifier. Presented at: European Microwave Conference (EuMC) 2010, Paris, France. Vol. 561630. pp. 1674-1677.
Cripps, S. C. and Porch, A. 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. Vol. 546185.

2009

Wright, P., Lees, J., Benedikt, J., Tasker, P. and Cripps, S. C. 2009. A Methodology for Realizing High Efficiency Class-J in a Linear and Broadband PA. IEEE Transactions on Microwave Theory and Techniques 57(12), pp. 3196-3204. (10.1109/TMTT.2009.2033295)
Cripps, S. C., Tasker, P., Clarke, A. L., Lees, J. and Benedikt, J. 2009. On the continuity of high efficiency modes in linear RF power amplifiers. IEEE Microwave and Wireless Components Letters 19(10), pp. 665-667. (10.1109/LMWC.2009.2029754)
Wright, P. T., Lees, J., Tasker, P. J., Benedikt, J. and Cripps, S. C. 2009. An Efficient, Linear, Broadband Class-J-Mode PA Realised Using RF. Presented at: IEEE/MTT-S International Microwave Symposium 2009, Boston, MA, USA, 7-12 June 2009IEEE MTT-S International Microwave Symposium Digest, 2009. MTT '09. Los Alamitos, CA: IEEE pp. 653-656., (10.1109/MWSYM.2009.5165781)

2008

Cripps, S. 2008. Trapwave Inc. [Microwave Bytes]. IEEE Microwave Magazine 9(4), pp. 46-51., article number: 10103186. (10.1109/MMM.2008.924789)
Lees, J., Williams, T., Woodington, S., McGovern, P., Cripps, S. C., Benedikt, J. and Tasker, P. 2008. Demystifying Device related Memory Effects using Waveform Engineering and Envelope Domain Analysis. Presented at: 38th European Microwave Conference 2008 (EuMC 2008), Amsterdam, The Netherlands. pp. 753-756., (10.1109/EUMC.2008.471562)

Contracts

Title	People	Sponsor	Value	Duration
Development of robust broadband Power amplifiers based on high voltage HBT's	Tasker P, Cripps S	TriQuint WJ Inc	27500	01/10/2012 - 30/09/2015
Integrating High-Performance Power Amplifier with Miniturized Wideband Antenna for Highly-Efficient Future Communication Devices	Lees J, Tasker P, Cripps S	Ser Cymru NRN AEM Swansea	59350	01/10/2014 - 30/09/2017
Wide bandwidth power-switchable high efficiency amplifiers	Cripps S	Selex ES	88650	15/10/2014 - 31/12/2015
Power amplifier design for wideband communications (PADWIC)	Cripps S	EC Horizon2020	146764	01/09/2015 - 31/08/2017
Wide band high efficiency power amplifier study and demonstration	Cripps S	Selex ES Ltd	40000	16/09/2013 - 30/04/2014
RF Push-pull broadband power amplifiers	Cripps S, Powell J	SELEX ES LTD	24949	11/01/2013 - 12/07/2013
Characterization, analysis and recommendations for drain efficiency of the VHV8 platform above 1GHz	Cripps S, Tasker P	Freescale Semiconductor	33710	23/04/2014 - 22/10/2014
Clean and Green Microwave heating using solid state physics	Cripps, S, Porch A, Lees J	NXP Semiconductors Netherlands B V	30000	01/10/2011 - 30/09/2014

Supervised Students

Title	Student	Status	Degree
Device level characterisation of out-phasing amplifiers	BOGUSZ Aleksander	Current	PhD
Solid-State Microwave heating For Biomedical Applications	IMTIAZ Azeem	Graduate	PhD
Re-configure high efficiency power amplifiers.	SHEPPHARD Daniel John	Current	PhD
DEVELOPMENT OF ROBUST BROADBAND POWER AMPLIFIERS BASED ON HIGH VOLTAGE HBTS.	LOESCHER David John	Current	PhD
INTEGRATING HIGH-PERFORMANCE POWER AMPLIFIERS WITH MINIATURIZED WIDEBAND ANTENNAS FOR HIGHLY-EFFICIENT FUTURE COMMUNICATION DEVICES.	NAGASUNDARAM Elango	Current	PhD
Power amplifier design for microwave heating applications	CHAUDHRY Kauser	Current	PhD
High Resolution Electric Field Probes With Applications In High Efficiency RF Power Amplifier Design	DEHGHAN Nelo	Graduate	PhD
Braodband Microwave Push-Pull Power Amplifiers	SMITH Robert	Graduate	PhD
DOHERTY AMPLIFIER WITH AID OF AD-HOC OPTIMIZATION FOR SDR APPLICATIONS.	KAMARUDIN Syalwani Binti	Current	PhD
Continuous Mode High Efficiency Power Amplifier Design For X Band	CANNING Timothy	Graduate	PhD
The Auxiliary Envelope Tracking RF Power Amplifiers	YUSOFF Zubaida	Graduate	PhD

Yr Athro Steve C. Cripps

Anwyd: Liverpool, Lloegr; 1950

Addysg:

1961-67 Ysgol Uwchradd Sefydliad Lerpwl

1968-71 Prifysgol Caergrawnt (Coleg yr Iesu); B.A. (Anrhydedd, Dosbarth 1af) 1971

M.A. (Prifysgol Caergrawnt, 1973)

1971-74 Prifysgol Caergrawnt (Adran Peirianneg.) ; P. D. 1975

(Teitl Thesis "Trappatt Oscillators and Applications")

Cysylltiad Proffesiynol:

Cymrawd E.e. (Cymrawd Bywyd 2015)

Cadeirydd, h.y.e Cymdeithas Theori a Thechnegau Microdon (MTT), Siôn Corn

ClaraValley Chapter. (1993-4)

Aelod, UK ADCOM IEEE MTT/LEOS Chapter

Aelod, Pwyllgor Cydlynu Technegol IEEE MTT (TCC)

Aelod, Pwyllgor Rhaglen Dechnegol IEEE MTT

Aelod, Pwyllgor Cyhoeddiadau IEEE MTT

Is-gadeirydd (gorffennol), IEEE MTT TCC Adran 5 (Mwyhadon Pŵer Uchel)

(Nodyn: Mae pwyllgor MTT-TPC yn adolygu ac yn dewis papurau ar gyfer y Symposiwm Microdon Rhyngwladol, a'r Trafodion IEEE ar Theori a Thechnegau Microdon. Mae MTT-TCC yn gosod polisïau a blaenoriaethau ar gyfer gweithgareddau ymchwil a chyhoeddiadau ym maes microdon a RF).

Dyfarniadau:

2008 derbynnydd Gwobr Ceisiadau Microdon mawreddog IEEE-MTT, am "Cyfraniadau i theori a dyluniad chwyddseinyddion pŵer microdon band eang".

2016 derbynnydd gwobr IEEE-MTT Microdon am y papur gorau yn MTT Transactions (2014-15).

2018 derbynnydd Gwobr IEEE MTT Itoh am y papur mwyaf dylanwadol mewn Microdon a Llythyrau Cydrannau Cil-wifr (2017-18).

Profiad Gwaith:

Athro Ymchwil Nodedig 2010 , Prifysgol Caerdydd

1990 (Ebrill) - Ffurfiodd Hywave Associates, RF a Microdon Consulting Company. Mae'r cleientiaid hyd yn hyn yn cynnwys:

Freescale, Is-adran Lled-ddargludyddion RF (Tempe, Az., UDA)

Zinwave (Cambrudge, y DU, radio dros chwyddseinyddion ffibr)

Lucent-Alcatel (Swindon, DU, PAs Uchel Pŵer)

BesserAssociates (Cyrsiau Hyfforddiant Technegol)

CEI Ewrop (Cyrsiau Hyfforddiant Technegol)

Is-adran Technoleg Gymhwysol Litton (Cydran ac Is-systemau ECM)

Microdon Wavetek (Offerynnau Microdon)

Matcom (GaAsFET Ceisiadau Peirianneg)

Technoleg palmwydd (Cyfathrebu Fiber Optegol)

Akon (Chwyddseinyddion Log Synhwyrydd Band Eang (DLVAs)

Ffocws Newydd (Offeryn Optegol)

Monolitheg y Môr Tawel (GaAs MMICs ac is-systemau)

Microsys ADX (Systemau Cyfathrebu Di-wifr)

Technoleg microdon (dyfeisiau microdon ac is-systemau)

Spectrian (Amps Pŵer Gorsaf Sylfaen Cellog)

TriquintSemiconductor (GaAs MMIC Power Amplifiers)

Nokia Telegyfathrebu (MCPA Linearisation)

Filtronic (Shipley, UK, High Power PAs a leinarization)

NXP lled-ddargludyddion (Nijmegen, Yr Iseldiroedd, lled-ddargludyddion RF pŵer uchel)

Sintera (Santa Clara, UDA, PA linearization RFICs)

1985-1990 - Celeritek, San Jose (Sylfaenydd, Rheolwr Peirianneg).

Rheoli'r holl weithgareddau Peirianneg dylunio yn y Cwmni gan gynnwys cynllunio, recriwtio, dyfyniadau, system ddogfennau, cyfleusterau CAD a Lab Peirianneg. Gweithiodd hefyd fel cyfrannwr peirianneg unigol mewn sawl maes cynnyrch mawr:

* chwyddseinyddion pŵer MIC Band Eang

* chwyddseinyddion sŵn isel

* chwyddseinyddion band llydan Ultra (2-20 GHz)

* chwyddseinyddion tonnau Millimeter (18-40 Ghz)

* Pecynnu miniaturized MIC

* Technoleg ffilm tenau uwch

* Cynhyrchion MMIC (mwyhaduron, switshis, attenuators)

1984-85 - Narda West, (Loral Corp.), San Jose

Rheolwr, Peirianneg Cydran Gweithredol.Headed y Grŵp Peirianneg ar gyfer llinell cynnyrch mwyhadur microdon (13 peirianwyr, technegwyr).

Roedd meysydd cynnyrch newydd a ddatblygwyd yn ystod y cyfnod hwn yn cynnwys chwyddseinyddion logarithmig RF a mwyhadur AGC y gellir eu rhaglennu'n ddigidol dros fandiau amledd 2 i 18 GHz. Gweithredwyd gweithdrefnau llwyddiannus a dulliau prawf ar gyfer cynhyrchu llongau meintiau o chwyddseinyddion dolen cof amledd (FML).

1979-84 Watkins Johnson (Palo Alto, a Windsor, Lloegr)

Pennaeth, Power Amplifiers (1982-84). Pennaeth grŵp sy'n gyfrifol am ddylunio a chynhyrchu amplifiers cyflwr solet pŵer canolig. Yn bersonol gyfrifol am ddylunio mwyhadur cyflwr solet 2-8 GHz 1 Watt cyntaf y diwydiant. I gyflawni hyn, datblygwyd a chyhoeddwyd dull damcaniaethol newydd o ddylunio a modelu GaAsFETs pŵer uchel (gweler cyhoeddiadau, 1983). Mae'r dechneg hon yn dal i gael ei defnyddio'n helaeth heddiw.

Cyn trosglwyddo i Adran Wladwriaeth Solid ym 1981, roedd yn Arweinydd Grŵp yng nghyfleuster Watkins Johnson yn Lloegr. Datblygu ystod o gydrannau gweithredol a goddefol yn yr ystod UHF a microdon i ategu llinell cynnyrch dosbarthu antena.

1974-79 - Plessey Research Ltd., Towcester, Lloegr.

Arweinydd Grŵp, grŵp cymwysiadau hybrid GaAsFET (1977-79). Pennaeth grŵp (6 peiriannydd) datblygu ystod o gynhyrchion gan ddefnyddio dyfeisiau FET GaAs a weithgynhyrchir yn fewnol. Roedd y rhain yn cynnwys chwyddseinyddion sŵn isel, cymysgwyr, ac osgiliaduron.

Patentau:

"MicrostripBalun wedi gwella lled band"

(Cyhoeddwyd ym mis Ebrill 1988)

"Dyfeisiau FET Lluosog Sydd â Chamau Cyplysedig Uniongyrchol ar gyfer Gwell Gweithredu Microdon" (cyhoeddwyd Mehefin 1991)

"Dull a dulliau ar gyfer mesur tymheredd sianel dyfais weithredol mewn hybridau microdon ac MMICs"

(Cyhoeddwyd ym mis Gorffennaf 1991)

Synhwyrydd microdon wedi gwella llinoledd" (cyhoeddwyd 1993)

"Effeithlonrwydd Uchel RF Power Amplifier" (Cyhoeddwyd Gorffennaf 1994)

"A reconfigurable Microwave Amplifier" (noddwyd gan Selex, tra'n aros)

Yr Athro Steve Cripps

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