Staff Profile: Dr J Lees
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Research Publications (2001 - )
Journal
Morgan A, Naylon AJ, Gooding S, John C, Squires O, Lees J, Barrow DA, Porch A, Efficient microwave heating of microfluidic systems, Sensors and Actuators B: Chemical , (2013) ISSN 0925-4005 10.1016/j.snb.2013.02.099
Pullin R, Eaton MJ, Pearson MR, Featherston CA, Lees J, Naylon AJ, Kural A, Simpson DJ, Holford KM, On the Development of a Damage Detection System using Macro-fibre Composite Sensors, Journal of Physics. Conference Series , 382 (1) (2012) ISSN 1742-6588 10.1088/1742-6596/382/1/012049
Smith RM, Lees J, Tasker PJ, Benedikt J, Cripps SC, A Novel Formulation for High Efficiency Modes in Push-Pull Power Amplifiers Using Transmission Line Baluns, IEEE Microwave and Wireless Components Letters , 22 (5) (2012) 257-259 ISSN 1531-1309 10.1109/LMWC.2012.2191273
Hone TM, Bensmida S, Morris KA, Beach MA, McGeehan JP, Lees J, Benedikt J, Tasker PJ, Controlling Active Load-Pull in a Dual-Input Inverse Load Modulated Doherty Architecture, IEEE Transactions on Microwave Theory and Techniques , 60 (6) (2012) 1797-1804 ISSN 0018-9480 10.1109/TMTT.2012.2190748
Akmal M, Carrubba V, Lees J, Benedikt J, Tasker PJ, An enhanced modulated waveform measurement system, Australian Journal of Electrical & Electronics Engineering , 9 (4) (2012) 429-438 ISSN 1448837X 10.7158/E11-033.2012.9.4
Akmal M, Carrubba V, Lees J, Benedikt J, Tasker PJ, An enhanced modulated waveform measurement system, Australian Journal of Electrical and Electronics Engineering , 9 (4) (2012) 429-438 ISSN 1448-837X 10.7158/E11-033.2012.9.4
Carrubba V, Akmal M, Quay R, Lees J, Benedikt J, Cripps SC, Tasker PJ, The Continuous Inverse Class-F Mode With Resistive Second-Harmonic Impedance, IEEE Transactions on Microwave Theory and Techniques , 60 (6) (2012) 1928-1936 ISSN 0018-9480 10.1109/TMTT.2012.2189228
Carrubba V, Clarke AL, Akmal M, Lees J, Benedikt J, Tasker PJ, Cripps SC, On the extension of the continuous class-F mode power amplifier, IEEE Transactions on Microwave Theory and Techniques , 59 (5) (2011) 1294-1303 ISSN 0018-9480 10.1109/TMTT.2011.2117435
Hashmi MS, Clarke AL, Woodington SP, Lees J, Benedikt J, Tasker P, An accurate calibrate-able multiharmonic active load-pull system based on the envelope load-pull concept, IEEE Transactions on Microwave Theory and Techniques , 58 (3) (2010) 656-664 ISSN 0018-9480 10.1109/TMTT.2010.2040403
Hashmi MS, Clarke AL, Lees J, Helaoui M, Tasker PJ, Ghannouchi FM, Agile harmonic envelope load-pull system enabling reliable and rapid device characterization, Measurement Science and Technology , 21 (5) (2010) ISSN 0957-0233 10.1088/0957-0233/21/5/055109
Wright P, Lees J, Benedikt J, Tasker P, Cripps SC, A Methodology for Realizing High Efficiency Class-J in a Linear and Broadband PA, IEEE Transactions on Microwave Theory and Techniques , 57 (12) (2009) 3196-3204 ISSN 0018-9480 10.1109/TMTT.2009.2033295
Cripps SC, Tasker P, Clarke AL, Lees J, Benedikt J, On the continuity of high efficiency modes in linear RF power amplifiers, IEEE Microwave and Wireless Components Letters , 19 (10) (2009) 665-667 ISSN 1531-1309 10.1109/LMWC.2009.2029754
Alghanim A, Lees J, Williams T, Benedikt J, Tasker PJ, Sensitivity of electrical baseband memory effects to higher-order IF components for high-power LDMOS power amplifiers, Electronics Letters , 44 (5) (2008) 358-359 ISSN 0013-5194 10.1049/el:20083348
Lees J, Benedikt J, Hilton P, Powell J, Balmer RS, Uren MJ, Martin T, Tasker P, Experimental gallium nitride microwave Doherty amplifier, IEEE Electronic Letters , 41 (23) (2005) 1284-1285 ISSN 0013-5194 10.1049/el:20053155
Conference
McGenn W, Choi H, Lees J, Uren MJ, Benedikt J, Tasker PJ, Development of a RF waveform stress test procedure for GaN HFETs subjected to infinite VSWR sweeps, Microwave Symposium Digest (MTT), 2012 IEEE MTT-S International , (2012) 1-3 ISBN 9781467310857ISSN 0149-645X 10.1109/MWSYM.2012.6259725
Mimis K, Morris KA, Beach MA, McGeehan JP, Lees J, Benedikt J, Tasker PJ, Overlapped segment piece-wise polynomial pre-distortion for the linearisation of power amplifiers in the presence of high PAPR OFDM signals, Microwave Symposium Digest (MTT), 2012 IEEE MTT-S International , (2012) 1-3 ISBN 9781467310857ISSN 0149-645X 10.1109/MWSYM.2012.6259543
Smith RM, Lees J, Tasker PJ, Benedikt J, Cripps SC, A 40W push-pull power amplifier for high efficiency, decade bandwidth applications at microwave frequencies, Microwave Symposium Digest (MTT), 2012 IEEE MTT-S International , (2012) 1-3 10.1109/MWSYM.2012.6259418
Tasker PJ, Carrubba V, Wright P, Lees J, Benedikt J, Cripps SC, Wideband PA design: The "continuous" mode of operation, Compound Semiconductor Integrated Circuit Symposium (CSICS), 2012 IEEE , (2012) 1-4 ISBN 9781467309288ISSN 1550-8781 10.1109/CSICS.2012.6340048
Carrubba V, Quay R, Schlechtweg M, Ambacher O, Akmal M, Lees J, Benedikt J, Tasker PJ, Cripps SC, Continuous-ClassF3 power amplifier mode varying simultaneously first 3 harmonic impedances, Microwave Symposium Digest (MTT), 2012 IEEE MTT-S International , (2012) 1-3 ISBN 9781467310857ISSN 0149-645X 10.1109/MWSYM.2012.6258343
Carrubba V, Clarke AL, Akmal M, Yusoff ZB, Lees J, Benedikt J, Cripps SC, Tasker PJ, Exploring the Design Space for Broadband PAs using the Novel "Continuous Inverse Class-F Mode", Proceedings of the 41st European Microwave Conference (EuMC) , (2011) 333-336 ISBN 9781612842356
Carrubba V, Clarke AL, Woodington SP, McGenn W, Akmal M, Almuhaisen A, Lees J, Cripps SC, Tasker PJ, Benedikt J, High-speed device characterization using an active load-pull system and waveform engineering postulator, Design and Measurement of Microwave Systems - Proceedings of the 2011 77th ARFTG Microwave Measurement Conference (ARFTG) , (2011) ISBN 9781612849591 10.1109/ARFTG77.2011.6034553
Carrubba V, Lees J, Benedikt J, Tasker PJ, Cripps SC, A novel highly efficient broadband continuous class-F RFPA delivering 74% average efficiency for an octave bandwidth, 2011 IEEE/MTT-S International Microwave Symposium - MTT 2011 , (2011) 350-353 ISBN 9781612847542 10.1109/MWSYM.2011.5972701
Canning TA, Almuhaisen A, Lees J, Benedikt J, Cripps SC, Tasker PJ, Utilization of RF I-V waveform load-pull information to identify the role FET knee profile has on locating the efficiency maxima, Proceedings of the 2011 78th ARFTG Microwave Measurement Symposium (ARFTG) - High Power RF Measurement Techniques , (2011) ISBN 9781467302814 10.1109/ARFTG78.2011.6183864
Akmal M, Lees J, Jiangtao S, Carrubba V, Yusoff ZB, Woodington SP, Benedikt J, Tasker PJ, Bensmida S, Morris K, Beach M, McGeehan J, An enhanced modulated waveform measurement system for the robust characterization of microwave devices under modulated excitation, Microwave Integrated Circuits Conference (EuMIC), 2011 European , (2011) 180-183 ISBN 9781612842363
Almuhaisen A, Lees J, Cripps SC, Tasker PJ, Benedikt J, Wide band high-efficiency power amplifier design, Proceedings of the 6th European Microwave Integrated Circuits Conference (EuMIC) , (2011) 184-187 ISBN 9781612842363
Bell JJ, Saini R, Woodington SP, Lees J, Benedikt J, Cripps SC, Tasker PJ, Behavioral model analysis using simultaneous active fundamental load-pull and harmonic source-pull measurements at X-band, Microwave Symposium Digest (MTT), 2011 IEEE MTT-S International , (2011) 982-986 ISBN 9781612847542 10.1109/MWSYM.2011.5972803
Smith RM, Cripps SC, Tasker PJ, Benedikt J, Lees J, A design methodology for the realization of multi-decade baluns at microwave frequencies, 2011 IEEE/MTT-S International Microwave Symposium - MTT 2011 , (2011) 1204-1208 ISBN 9781612847542 10.1109/MWSYM.2011.5972702
Yusoff ZB, Akmal M, Carrubba V, Lees J, Benedikt J, Tasker PJ, Cripps SC, The benefit of GaN characteristics over LDMOS for linearity improvement using drain modulation in power amplifier system, 2011 Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits (INMMIC 2011) , (2011) 109-112 ISBN 9781457706509 10.1109/INMMIC.2011.5773334
Yusoff ZB, Lees J, Benedikt J, Tasker PJ, Cripps SC, Linearity improvement in RF power amplifier system using integrated Auxiliary Envelope Tracking system, 2011 IEEE/MTT-S International Microwave Symposium - MTT 2011 , (2011) 1752-1755 ISBN 9781612847542 10.1109/MWSYM.2011.5972769
Akmal M, Carrubba V, Lees J, Bensmida S, Benedikt J, Morris K, Beach M, McGeehan J, Tasker PJ, Linearity enhancement of GaN HEMTs under complex modulated excitation by optimizing the baseband impedance environment, 2011 IEEE/MTT-S International Microwave Symposium - MTT 2011 , (2011) 1747-1750 ISBN 9781612847542 10.1109/MWSYM.2011.5972833
FitzPatrick D, Saini R, Lees J, Benedikt J, Cripps SC, Tasker PJ, A waveform engineering approach to the design of improved efficiency wideband MMIC amplifiers, 2011 IEEE 12th Annual Wireless and Microwave Technology Conference (WAMICON), Clearwater Beach, FL, 18-19 April 2011 , (2011) 225-230 ISBN 9781612840819 10.1109/WAMICON.2011.5872859
Hone T, Bensmida S, Paynter M, Morris K, Beach M, McGeehan J, Lees J, Benedikt J, Tasker PJ, Optimized load modulation in a doherty amplifier using a current injection technique, Proceedings of the 6th European Microwave Integrated Circuits Conference (EuMIC) , (2011) 296-299 ISBN 9781612842363
Paynter M, Bensmida S, Morris KA, McGeehan JP, Akmal M, Lees J, Benedikt J, Tasker PJ, Beach M, Non-linear large signal PA modelling for switching-mode operation (class-F/continuous class-F), Proceedings of the 6th European Microwave Integrated Circuits Conference (EuMIC) , (2011) 152-155 ISBN 9781612842363
Saini R, Bell JJ, Canning TA, Woodington SP, Fitzpatrick DM, Lees J, Benedikt J, Tasker PJ, High speed non-linear device characterization and uniformity investigations at X-band frequencies exploiting behavioral models, Design and Measurement of Microwave Systems - Proceedings of the 2011 77th ARFTG Microwave Measurement Conference (ARFTG) , (2011) ISBN 9781612849591 10.1109/ARFTG77.2011.6034552
Saini R, Bell JJ, Williams T, Lees J, Benedikt J, Tasker PJ, Interpolation and extrapolation capabilities of non-linear behavioural models, Proceedings of the 2011 78th ARFTG Microwave Measurement Symposium (ARFTG) - High Power RF Measurement Techniques , (2011) ISBN 9781467302814 10.1109/ARFTG78.2011.6183865
Saini R, Woodington SP, Lees J, Benedikt J, Tasker PJ, An intelligence driven active loadpull system, 75th ARFTG Microwave Measurement Conference: Measurement of Modulated Signals for Communications , (549632) (2010)
Lees J, Akmal M, Bensmida S, Benedikt J, Morris K, Beach M, McGeehan J, Tasker P, Waveform engineering applied to linear-efficient PA design, 2010 IEEE 11th Annual Wireless and Microwave Technology Conference (WAMICON 2010) , (546184) (2010) 10.1109/WAMICON.2010.5461847
Clarke AL, Akmal M, Lees J, Tasker PJ, Benedikt J, Investigation and analysis into device optimization for attaining efficiencies in-excess of 90% when accounting for higher harmonics, 2010 IEEE MTT-S International Microwave Symposium Digest (MTT 2010) , (2010) 1114-1117 ISBN 9781424460564 10.1109/MWSYM.2010.5517222
FitzPatrick DM, Williams T, Lees J, Benedikt J, Cripps SC, Tasker P, Exploitation of active load-pull and DLUT models in MMIC design, Proceedings of the 2010 IEEE Radio Frequency Integrated Circuits Symposium May 23-25, 2010, Anaheim, California, USA , (2010) 487-490 ISBN 9781424462407 10.1109/RFIC.2010.5477406
Akmal M, Lees J, Carrubba V, Bensmida S, Woodington S, Benedikt J, Morris K, Beach M, McGeehan J, Tasker PJ, Minimization of baseband electrical memory effects in GaN HEMTs using active IF load-pull , 2010 Asia-Pacific Microwave Conference proceedings : APMC 2010 : Dec. 7-10, Yokohama, Japan , (2010) 5-8 ISBN 9781424475902
Akmal M, Lees J, Bensmida S, Woodington S, Carrubba V, Cripps SC, Benedikt J, Morris K, Beach M, McGeehan J, Tasker P, The effect of baseband impedance termination on the linearity of GaN HEMTs, European Microwave Conference 2010 , (561636) (2010) 1046-1049
Akmal M, Lees J, Bensmida S, Woodlington S, Benedikt J, Morris K, Beach M, McGeehan J, Tasker P, The impact of baseband electrical memory effects on the dynamic transfer characteristics of microwave power transistors, 2010 Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits (INMMIC) , (548011) (2010) 148-151
Naylon J, Gooding S, John C, Morgan A, Squires O, Lees J, Barrow DA, Porch A, Efficient Microwave heating and dielectric characterization of microfluidic systems, Proceedings of MicroTAS 2010 , (2010) 2092-2094
Woodington SP, Saini R, Williams D, Lees J, Benedikt J, Tasker PJ, Behavioral model analysis of active harmonic load-pull measurements, Microwave Symposium Digest (MTT), 2010 IEEE MTT-S International , (2010) 1688-1691 ISBN 9781424460564 10.1109/MWSYM.2010.5517261
Bensmida S, Morris K, Akmal M, Lees J, Wright PT, Benedikt J, Tasker PJ, McGeehan J, Beach M, Generic pre-distortion of a Class-J Power amplifier, European Microwave Conference 2010 , (561648) (2010) 1022-1025
Almuhaisen A, Wright PT, Lees J, Tasker PJ, Cripps SC, Benedikt J, Novel wide band high-efficiency active harmonic injection power amplifier concept, 2010 IEEE MTT-S International Microwave Symposium Digest (MTT 2010) , (2010) 664-667 ISBN 9781424460564 10.1109/MWSYM.2010.5514759
Carrubba V, Clarke AL, Akmal M, Lees J, Benedikt J, Tasker P, Cripps SC, The continuous Class-F Mode mode power amplifier, European Microwave Conference (EuMC) 2010 , (561630) (2010) 1674-1677
Wright PT, Lees J, Tasker PJ, Benedikt J, Cripps SC, An Efficient, Linear, Broadband Class-J-Mode PA Realised Using RF, IEEE MTT-S International Microwave Symposium Digest, 2009. MTT '09 , (2009) 653-656 ISBN 9781424428038ISSN 0149-645X 10.1109/MWSYM.2009.5165781
Bensmida S, Morris K, Lees J, Wright PT, Benedikt J, Tasker PJ, Beach M, McGeehan J, Power amplifier memory-less pre-distortion for 3GPP LTE application, European Microwave Week 2009 - "Science, Progress and Quality at Radiofrequencies": Conference Proceedings , (2009) 1433-1436 ISBN 9781424447480
Fitzpatrick DM, Lees J, Sheikh A, Benedikt J, Tasker PJ, Systematic investigation of the impact of harmonic termination in the efficiency performance of above octave bandwidth microwave amplifiers, European Microwave Week 2009 - "Science, Progress and Quality at Radiofrequencies": Conference Proceedings , (2009) 1445-1448 ISBN 9781424447480
Hashmi MS, Clarke AL, Woodington SP, Lees J, Benedikt J, Tasker P, Electronic Multi-Harmonic Load-Pull System for Experimentally Driven Power Amplifier Design Optimization, IEEE/MTT-S International Microwave Symposium 2009 , (2009) 1549-1552
Sheikh A, Lees J, Benedikt J, Tasker PJ, Utilization of a measurement based CAD tool for enhanced pa design investigations, Proceedings of the 38th European Microwave Conference, 2008 (EuMC 2008) , (2009) 1671-1674 ISBN 9782874870064 10.1109/EUMC.2008.4751795
Lees J, Williams T, Woodington S, McGovern P, Cripps SC, Benedikt J, Tasker P, Demystifying Device related Memory Effects using Waveform Engineering and Envelope Domain Analysis, 38th European Microwave Conference 2008 (EuMC 2008) , (2008) 753-756 10.1109/EUMC.2008.471562
FitzPatrick DM, Williams T, Lees J, Benedikt J, Tasker P, Large signal device characterisation using active load-pull for improved MMIC design, IET Seminar on RF and Microwave IC Design , (2008) 1-7
Woodington SP, Williams T, Qi H, Williams D, Pattison L, Patterson A, Lees J, Benedikt J, Tasker PJ, A novel measurement based method enabling rapid extraction of a RF waveform look-up table based behavioural model, IEEE MTT-S International Microwave Symposium Digest , (2008) 1453-1456 10.1109/MWSYM.2008.463305
Wright PT, Lees J, Tasker PJ, Benedikt J, GaN power transistors in narrow and wide bandwidth applications, IET Seminar on Wideband Receivers and Components , (2008)
Williams T, Mojon O, Woodington SP, Lees J, Barciela MF, Benedikt J, Tasker PJ, A robust approach for comparison and validation of large signal measurement systems, IEEE MTT-S International Microwave Symposium Digest , (2008) 257-260 10.1109/MWSYM.2008.4633152
Alghanim A, Lees J, Williams T, Benedikt J, Tasker P, Reduction of electrical baseband memory effect in high-power LDMOS devices using optimum termination for IMD3 and IMD5 using active load-pull, IEEE MTT-S International Microwave Symposium Digest , (2008) 415-418 10.1109/MWSYM.2008.4633191
Alghanim A, Lees J, Williams T, Benedikt J, Tasker PJ, Using active IF load-pull to investigate electrical base-band induced memory effects in high-power LDMOS transistors, Asia-Pacific Microwave Conference (APMC 2007) , (2007) 1-4 10.1109/APMC.2007.4554737
Alghanim A, Lees J, Wiliams T, Benedikt J, Tasker P, Investigation of electrical base-band memory effects in high power 20w LDMOS power amplifiers, 37th European Microwave Conference , (2007) 48-51 10.1109/EUMC.2007.4405122
Sheikh A, Tasker PJ, Lees J, Benedikt J, The impact of system impedance on the characterisation of high power devices, 37th European Microwave Conference (EuMC) , (2007) 949-952 10.1109/EUMC.2007.4405315
Mayer M, Arthaber H, Magerl G, Kother D, Lees J, Benedikt J, Tasker P, Advanced load pull systems, The Institution of Engineering and Technology Seminar on High Efficiency Power Amplifier Design for Next Generation Wireless Applications , (2006) 27-54
Lees J, Sheikj A, Benedikt J, Tasker P, The Design of a Gallium Nitride Doherty Amplifier using Waveform Measurements and Active Harmonic Load-Pull, 2006 International Workshop on Integrated Nonlinear Microwave and Millimeter-Wave Circuits , (2006) 26-29
Aubrey AJ, Hicks YA, Lees J, Chambers JA, Using the bi-modality of speech for convolutive frequency domain blind source separation, Proceedings of IMA 7th International Conference on Mathematics in Signal Processing , (2006)
Lees J, Benedikt J, Bunz B, Gaquiere C, Ducatteau D, Marquez-Sequra E, Martin-Guerrero TM, Barel A, A comparison of load-pull measurement results of a 4W Phemt involving five European laboratories, Proceedings of the European Gallium Arsenide and Other Semiconductor Application Symposium Paris, France,3-4 October, 2005 , (2005) 321-324
Lees J, Benedikt J, Hilton KP, Powell J, Balmer RS, Uren MJ, Martin T, Tasker P, Characterisation of an experimental gallium nitride microwave Doherty amplifier, 35th European Microwave Conference: conference proceedings , (2005)
Aboush Z, Jones C, Knight G, Sheikh A, Lee H, Lees J, Benedikt J, Tasker P, High power active harmonic load-pull system for characterisation of high power 100-Watt transistors, 35th European Microwave Conference , 1 (2005) 609-612 10.1109/EUMC.2005.1608930
Aboush Z, Lees J, Benedikt J, Tasker PJ, Active harmonic load-pull system for characterising highly mismatched high power transistors, IEEE MTT-S International Microwave Symposium Digest 2005 , (2005) ISSN 01490-645X 10.1109/MWSYM.2005.1516920
Lees J, Haczewski J, Benedikt J, Tasker P, An automated multi-stimulus measurement system for characterising multi-device amplifiers, 34th European Microwave Conference , Nov-15 (2004) 435-438
Lees J, Goss M, Benedikt J, Tasker P, Single-tone optimisation of an adaptive-bias Doherty structure, Microwave Symposium Digest, IEEE MTT-S International , 3 (2003) 2213-2216 10.1109/MWSYM.2003.1210604
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This list is based upon an automated database search. The Cardiff School of Engineering cannot guarantee the accuracy or inclusivity of the search results. Retrospective data (e.g. for new members of staff) may not be included in the search results. |
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