Electronic & Electrical Engineering

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Aras an Phiarsaigh
Trinity College Dublin
Dublin 2
Ireland

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eleceng@tcd.ie Gaeilge
Dr. Justin King

Dr. Justin King

Assistant Professor, Electronic & Elect. Engineering

3531896 1594

Biography

Justin was awarded the PhD degree from University College Dublin (UCD) in 2012 for research into nonlinear electrothermal equivalent circuit models for AlGaN/GaN transistor devices, with applications to power amplifier design. He then commenced a postdoctoral research fellowship in the UCD RF and Microwave Research Group and continued to work on RF device simulation and modelling, and in 2014, he was appointed as an Assistant Professor in the UCD School of Electrical and Electronic Engineering. In 2019, Justin joined the Trinity College Dublin Electronic and Electrical Engineering Department as an E3 Assistant Professor. He continues to work on RF device modelling, he is a senior member of the IEEE, and has served on several national and international technical programme committees.

Publications and Further Research Outputs

  • Ciarán Wilson and Justin B. King, Intrinsic Capacitance Extraction from Pulsed S-parameters, 2019 European Microwave Conference, Paris, France, 2019Conference Paper, 2019
  • Jialin Cai and Jiangtao Su and Jun Liu and Chao Yu, Lingling Sun and Justin B. King, Bayesian Inference Based Behavioral Modeling Technique for {GaN, Submitted to IEEE Transactions on Microwave Theory and Techniques, 28, (8), 2018Journal Article, 2018
  • O. Lennon and Deirdre Phelan and Deborah Wallace and Justin King and Terry Barrett, Problem Based Learning to Improve Early Evidence based Practice in an Undergraduate Physiotherapy Professional Programme, Submitted to Physiotherapy Research International, 2018Journal Article, 2018
  • Deborah Wallace and O. Lennon and Justin King and Terry Barrett, The Research-Teaching Nexus as a Curriculum Development Tool in a Graduate Taught Programme , 2018 All Ireland Conference on Learning, Teaching and Assessment in Further and Higher Education, 2018Conference Paper, 2018
  • J. Cai and J. B. King and C. Yu, Support Vector Regression Based Behavioral Model for Load Mismatched {PA, Submitted to IEEE Microwave and Wireless Components Letters, 2018Journal Article, 2018
  • Ciarán Wilson and Justin B. King, Ensuring charge conservation in {GaN, 2018 , 2018Conference Paper, 2018
  • Jialin Cai and Justin B. King and Chao Yu and Jun Liu and Lingling Sun, Dynamic Behavioral Modeling of {RF, IEEE Transactions on Microwave Theory and Techniques, 2018Journal Article, 2018
  • Jialin Cai and Justin B. King and Chao Yu and Jun Liu and Lingling Sun, Bayesian Inference Based Small-Signal Modeling Technique for {GaN, International Journal of RF and Microwave Computer-Aided Engineering, 28, (8), 2018Journal Article, 2018
  • Jialin Cai and Justin B. King and Chao Yu and Jun Liu and Lingling Sun, Support Vector Regression based Behavioral Modelling Technique for RF PAs, IEEE Microwave and Wireless Components Letters, 28, (5), 2018, p428-430Journal Article, 2018
  • J. Cai and J. B. King, A New Nonlinear Behavioral Modeling Technique for {RF, 2017 , 2017Conference Paper, 2017
  • J. B. King and C. Wilson, Charge Conservative {FET, 2017 , 2017Conference Paper, 2017
  • J. B. King and T. J. Brazil, Time-domain Simulation of Passband {S, 2017 Integrated Nonlinear Microwave and Millimetre-wave Circuits, Graz, Austria., 2017Conference Paper, 2017
  • C. Wilson and J. B. King and T. J. Brazil, Extraction of Extrinsic {FET, 2017 Royal Irish Academy Colloquium on Radio Science and Communications, Dublin, Ireland., 2017Conference Paper, 2017
  • J. Cai and J. B. King and A. Zhu and J. C. Pedro and T. J. Brazil, Nonlinear Behavioral Model Dependent on Load Reflection Coefficient Magnitude, IEEE Transactions on Microwave Theory and Techniques, 63, (5), 2015, p1518-1529Journal Article, 2015, DOI
  • B. M. Merrick and J. B. King and T. J. Brazil, The Continuous Harmonic-Tuned Power Amplifier, IEEE Microwave and Wireless Components Letters, 25, (11), 2015, p736-738Journal Article, 2015, DOI
  • B. M. Merrick and J. B. King and T. J. Brazil, A wideband sequential power amplifier, 2014 , 2014Conference Paper, 2014
  • B. M Merrick and J. B. King and T. J. Brazil, A Novel Continuous Class-F mode Power Amplifier, 2014 IEEE Topical Conference on Power Amplifiers for Wireless and Radio Applications (PAWR), Newport Beach, California, USA., California, USA, 2014Conference Paper, 2014
  • Jialin Cai and King, J. B. and Brazil, T. J., An Improved Quadratic Poly-Harmonic Distortion Behavioral Model, 2014Journal Article, 2014
  • Jialin Cai and King, J. B. and Merrick, B. M. and Brazil, T. J., Pad\'e Approximation Based Behavioral Modeling, 61, (12), 2013, p4418-4427Journal Article, 2013
  • B. M. Merrick and J. B. King and T. J. Brazil, A simplified procedure for the design of continuous Class-{F, 2013 , 2013Conference Paper, 2013
  • King, J. B. and Brazil, T. J., Nonlinear electrothermal GaN HEMT model applied to high-efficiency power amplifier design, IEEE Transactions on Microwave Theory and Techniques , 61, (1), 2013, p444-454Journal Article, 2013
  • J. B. King and T. J. Brazil, A {GaN, 2012 , 2012Conference Paper, 2012
  • J. B. King and T. J. Brazil, A Comprehensive Electrothermal {GaN, 2012 , 2012Conference Paper, 2012
  • J. B. King and T. J. Brazil, Equivalent Circuit {GaN, 2012 , 2012Conference Paper, 2012
  • J. B. King, T. J. Brazil, Nonlinear Modelling of {GaN, 2010 Power Amplifier Symposium, Phoenix, Arizona, USA, 2010Conference Paper, 2010
  • J. B. King, T. J. Brazil, Nonlinear Modelling of a GaN Device, 2010 Royal Irish Academy Colloquium on Emerging Trends In Wireless Communications, Dublin, Ireland., 2010Conference Paper, 2010
  • Cai, Jialin and King, Justin and Chen, Shichang and Wu, Meilin and Su, Jiangtao and Wang, Jianhua, Machine learning-based broadband GaN HEMT behavioral model applied to class-J power amplifier design, International Journal of Microwave and Wireless Technologies, 2020, p1--9Journal Article, 2020
  • Wilson, Ciaran and Zhu, Anding and Cai, Jialin and King, Justin B, Padé-Approximation Based Behavioural Modelling for RF Power Amplifier Design, IEEE Access, 2021Journal Article, 2021
  • Ciarán Wilson, Marek Schmidt-Szalowski, JB King, Energy and Charge Conservation for FET Models, 2020 15th European Microwave Integrated Circuits Conference (EuMIC), Utrecht, 15/1/2021, 2021, pp173--176Conference Paper, 2021
  • Cai, Jialin and King, Justin and Su, Jiangtao and Yu, Chao and Chen, Shichang and Sun, Lingling and Liu, Jun, A new augmented support vector regression-based behavioral model for multi-device power amplifiers, Microwave and Optical Technology Letters, 2021Journal Article, 2021
  • Cai, Jialin and Liu, Jun and Pan, Baicao and Du, Xuekun and King, Justin, A Modified Poly-Harmonic Distortion Model Based on the Canonical Piecewise Linear Functions for GaN HEMTs, IEEE Access, 8, 2020, p181420--181431Journal Article, 2020
  • Cai, Jialin and King, Justin B and Yu, Chao and Chen, Shichang and Xie, Qiangqiang and Sun, Lingling, A Combined Broadband Model for GaN HEMTs in Admittance Domain Based on Canonical Piecewise Linear Functions, IEEE Transactions on Microwave Theory and Techniques, 68, (12), 2020, p5042--5054Journal Article, 2020
  • Cai, Jialin and Liu, Jun and King, Justin and Sun, Lingling, Machine learning technique based extremely broadband small-signal behavioral model for InP DHBTs, International Journal of RF and Microwave Computer-Aided Engineering, 30, (7), 2020, pe22235Journal Article, 2020
  • King, JB, Time-domain Representation of Passband Scattering Parameters, 2020 IEEE Asia-Pacific Microwave Conference (APMC), 2020Conference Paper, 2020
  • Cai, Jialin and King, Justin B, Behavioral Model of RF PAs Including Load Mismatch Effects Based on Canonical Section-wise Piecewise-Linear Function, IEEE Access, 8, 2020, p9469--9479Journal Article, 2020
  • King, JB, Time-domain Representation of Passband Scattering Parameters, 2020 IEEE Asia-Pacific Microwave Conference (APMC), 2020Conference Paper, 2020
  • Cai, Jialin and King, Justin and Liu, Jun and Wang, Jianhua and Sun, Lingling, Large-signal behavioral model for radio frequency power transistors based on modified canonical sectionwise piecewise-linear functions, International Journal of Numerical Modelling: Electronic Networks, Devices and Fields, 33, (6), 2020, pe2767Journal Article, 2020
  • Manjaly, Anna Davis and Sharma, Rajneesh and King, Justin, Probabilistic Behavioural Model Based on X-parameters, 2020 IEEE Asia-Pacific Microwave Conference (APMC), 2020, pp119--121Conference Paper, 2020
  • Cai, Jialin and Liu, Jun and Su, Jiangtao and Sun, Lingling and Chen, Shichang and Xia, Jing and King, Justin B, Behavioral model for RF power transistors based on canonical section-wise piecewise linear functions, IEEE Transactions on Microwave Theory and Techniques, 68, (4), 2020, p1409--1422Journal Article, 2020
  • Lennon, Olive and Phelan, Deirdre and Wallace, Deborah and King, Justin and Barrett, Terry, †The more you did, the more it made sense†: Problem-based learning to improve early evidence-based practice in an undergraduate physiotherapy professional programme, Physiotherapy Research International, 24, (3), 2019, pe1774Journal Article, 2019
  • Cai, Jialin and Yu, Chao and Sun, Lingling and Chen, Shichang and King, Justin B, Dynamic behavioral modeling of RF power amplifier based on time-delay support vector regression, IEEE Transactions on Microwave Theory and Techniques, 67, (2), 2018, p533--543Journal Article, 2018
  • Wilson, Ciaran and King, Justin, Ensuring Charge Conservation in GaN HEMT Large Signal Model, 2018 13th European Microwave Integrated Circuits Conference (EuMIC), 2018, pp61--64Conference Paper, 2018
  • Cai, Jialin and King, Justin and Yu, Chao and Liu, Jun and Sun, Lingling, Support vector regression-based behavioral modeling technique for RF power transistors, IEEE Microwave and Wireless Components Letters, 28, (5), 2018, p428--430Journal Article, 2018
  • Cai, Jialin and King, Justin and Pedro, Jose Carlos, A new nonlinear behavioral modeling technique for RF power transistors based on Bayesian inference, 2017 IEEE MTT-S International Microwave Symposium (IMS), 2017, pp624--626Conference Paper, 2017
  • King, Justin and Wilson, Ciar{\'a, Charge conservative FET modelling using ANNs, 2017 12th European Microwave Integrated Circuits Conference (EuMIC), 2017, pp208--211Conference Paper, 2017
  • King, Justin B and Brazil, Thomas J, Time-domain simulation of passband S-parameter networks using complex baseband vector fitting, 2017 Integrated Nonlinear Microwave and Millimetre-wave Circuits Workshop (INMMiC), 2017, pp1--4Conference Paper, 2017
  • Cai, Jialin and King, Justin B and Brazil, Tom J, An improved quadratic poly-harmonic distortion behavioral model, International Journal of Microwave and Wireless Technologies, 7, (6), 2015, p605Journal Article, 2015
  • Merrick, Brian M and King, Justin B and Brazil, Thomas J, The continuous harmonic-tuned power amplifier, IEEE Microwave and Wireless Components Letters, 25, (11), 2015, p736--738Journal Article, 2015
  • Merrick, Brian M and King, Justin B and Brazil, Thomas J, A novel continuous Class-F mode Power Amplifier, 2014 IEEE Topical Conference on Power Amplifiers for Wireless and Radio Applications (PAWR), 2014, pp19--21Conference Paper, 2014
  • Cai, Jialin and King, Justin B and Merrick, Brian M and Brazil, Thomas J, Pad{\'e, IEEE transactions on microwave theory and techniques, 61, (12), 2013, p4418--4427Journal Article, 2013
  • Merrick, B and King, J and Brazil, T, A simplified procedure for the design of continuous Class-F power amplifiers, 2013 European Microwave Conference, 2013, pp1479--1482Conference Paper, 2013
  • King, Justin B and Brazil, Thomas J, A GaN HEMT equivalent circuit model with novel approach to dispersion modelling, 2012 7th European Microwave Integrated Circuit Conference, 2012, pp68--71Conference Paper, 2012
  • King, Justin, Electrothermal Nonlinear Modelling of A1GaN/GaN HEMT Devices with Applications to Power Amplifier Design, 2012Thesis, 2012
  • King, Justin B and Brazil, Thomas J, Nonlinear electrothermal GaN HEMT model applied to high-efficiency power amplifier design, IEEE Transactions on Microwave Theory and Techniques, 61, (1), 2012, p444--454Journal Article, 2012
  • King, Justin B and Brazil, Thomas J, Equivalent circuit GaN HEMT model accounting for gate-lag and drain-lag transient effects, 2012 IEEE Topical Conference on Power Amplifiers for Wireless and Radio Applications, 2012, pp93--96Conference Paper, 2012
  • King, Justin B and Brazil, Thomas J, A comprehensive electrothermal GaN HEMT model including nonlinear thermal effects, 2012 IEEE/MTT-S International Microwave Symposium Digest, 2012, pp1--3Conference Paper, 2012
  • King, J and Oxley, CH and Brady, RC and Brazil, TJ, Small and Large Signal Modelling of GaN HEMTs, 2010Journal Article, 2010
  • Cai, J., King, J.B., Merrick, B.M., Brazil, T.J., Padé-approximation-based behavioral modeling, IEEE Transactions on Microwave Theory and Techniques, 61, (12), 2013, p4418-4427Journal Article, 2013, DOI
  • Sharma, R., Rana, A.K., Kaushal, S., King, J.B., Raman, A., Analysis of Underlap Strained Silicon on Insulator MOSFET for Accurate and Compact Modeling, Silicon, 14, (6), 2022, p2793-2801Journal Article, 2022, DOI
  • Wang, S., King, J., Cai, J., Memory polynomial based support vector regression dynamic behavioral model for Doherty power amplifiers, International Journal of Numerical Modelling: Electronic Networks, Devices and Fields, 35, (4), 2022Journal Article, 2022, DOI
  • Cai, J., King, J.B., Chen, S., You, B., Li, W., Liu, J., Stochastic Optimization of the CPL-Function-Based Model for RF Power Transistors, IEEE Microwave and Wireless Components Letters, 32, (7), 2022, p867-870Journal Article, 2022, DOI
  • Wu, M., Cai, J., King, J., Chen, S., Su, J., Cao, W., Design of a multi-octave power amplifier using broadband load-pull X-parameters, International Journal of Numerical Modelling: Electronic Networks, Devices and Fields, 34, (5), 2021Journal Article, 2021, DOI
  • Cai, J., King, J.B., Yu, C., Pan, B., Sun, L., Liu, J., Dynamic behavioral modeling of RF power amplifiers based on decomposed piecewise machine learning technique, International Journal of Microwave and Wireless Technologies, 13, (4), 2021, p315-321Journal Article, 2021, DOI
  • King, J.B., Efficient energy-conservative dispersive transistor modelling using discrete-time convolution and artificial neural networks, International Journal of Numerical Modelling: Electronic Networks, Devices and Fields, 34, (5), 2021Journal Article, 2021, DOI
  • Geng, M., Cai, J., King, J., You, B., Su, J., Liu, J., Sun, L., Cao, W., Pan, M., Modified small-signal behavioral model for GaN HEMTs based on support vector regression, International Journal of RF and Microwave Computer-Aided Engineering, 31, (9), 2021Journal Article, 2021, DOI
  • Wilson, C., Zhu, A., Cai, J., King, J.B., Pade-Approximation Based Behavioral Modeling for RF Power Amplifier Design, IEEE Access, 9, 2021, p18904-18914Journal Article, 2021, DOI
  • Manjaly, A.D., King, J., Probabilistic Poly Harmonic Distortion Model, 2021, pp289-292Conference Paper, 2021, DOI
  • Cai, J., Liu, J., Pan, B., Du, X., King, J., A modified poly-harmonic distortion model based on the canonical piecewise linear functions for GaN HEMTs, IEEE Access, 8, 2020, p181420-181431Journal Article, 2020, DOI
  • Lennon, O., Phelan, D., Wallace, D., King, J., Barrett, T., "The more you did, the more it made sense": Problem-based learning to improve early evidence-based practice in an undergraduate physiotherapy professional programme, Physiotherapy Research International, 24, (3), 2019Journal Article, 2019, DOI
  • Transient Analysis in, editor(s)Kai Chang , Encyclopedia of RF and Microwave Engineering, 2023, [Orla Feely, Brian Mulkeen and Justin B. King]Book Chapter, 2023

Research Expertise

RF transistor modelling High frequency circuit simulation Active antenna modelling and design

  • Title
    Advanced RF Transceivers for 5G base stations based on GaN Technology.
    Summary
    Future communications technologies will provide internet access to a wide range of applications: from billions of low data rate sensors to high resolution video streaming. The 5G network is designed to scale across these different use cases and will use different radio access technologies for each use case. To support very high data rates 5G will use wide bandwidth spectrum allocation at mm-wave frequencies. The offered bandwidth at the mm-wave frequencies (above 24 GHz) is more than 10 times as large as that in the lower bands (sub 6 GHz). However, the move to mm-waves comes at a cost " increased path loss. This makes it extremely challenging to provide coverage at mm-wave frequencies. A partial remedy is to use beamforming to direct the radio energy to a specific user. For some deployment scenarios beamforming is not enough and the output power must also be increased. A major challenge is to bring affordable, high permformance mm-wave active antenna arrays into production. There is currently a market pull for this systems. The main objectives of this "Advanced RF Transceivers for 5G base stations based on GaN Technology" proposal are substantial lowering of the cost, power consumption and an increase the output power of mm-wave active antenna systems. Advanced Gallium Nitride (GaN) technology will be used to obtain maximum output power and energy efficiency. High-volume and low-cost packaging and integration techniques developed for digital applications (CMOS) will be used. The capabilities of the developed technology will be shown in a set of demonstrators. The application driven demonstrators will be used to guide the technology development towards maximum impact and exploitation in the post project phase. The consortium spans the complete value chain: from wafer suppliers, semiconductor fabrication and system integrators. In addition, key universities and research institutes guarantees academic excellence throughout the project.
    Funding Agency
    European Commission

Recognition

  • Best Paper at Royal Irish Academy 2010
  • Best Teaching Assistant Award 2010
  • Best Paper at Radio and Wireless Week 2014
  • Trinity Excellence in Teaching Award 2021
  • UCD Teaching Excellence Award 2018
  • IEEE MTT Technical Committee on Design Automation (MTT-2)
  • IEEE Senior Member
  • Member of Organisation Committee for the Royal Irish Academy Communications and Radio Science Research Colloquium. 2017
  • Journal Reviewer for 20 papers in the Microwave Theory and Technology (MTT) transactions journal (T-MTT) 2012
  • Performed External Examination Duties for Thapar Institute of Engineering and Technology, India. 2019