![Heungjae Choi BSc, MSc, PhD, FHEA](https://profiles-cardiff.imgix.net/attachments/3844?w=200&h=200&auto=format&crop=faces&fit=crop&q=90")
Dr Heungjae Choi
(he/him)
BSc, MSc, PhD, FHEA
- Available for postgraduate supervision
Teams and roles for Heungjae Choi
Lecturer in High Frequency Engineering
Overview
I am
- a Lecturer in High Frequency Engineering at Cardiff University with a special focus on high power microwave-accelerated interdisciplinary research. My research covers microwave integrated and discrete circuits, resonators, and high power amplifiers in the frequency range from 1 Hz up to 120 GHz, including noninvasive continuous blood glucose monitor.
- a Deputy Research Group Leader for the Centre for High Frequency Engineering, with an aim of making our research group an enjoyable workplace.
- a Fellow of the Higher Education Academy, which means I am able to engage with a broad understanding of effective approaches to learning and teaching support as a key contribution to high-quality student learning.
- a challenger and I pursue excellence, examples include a Finalist in Engineering at SETforBRITAIN Awards 2016, an Outstanding Achievement Award at the Student High Efficiency Power Amplifier design competition in IEEE International Microwave Symposium, or Engineering Da Vinci Innovation and Impact Awards.
- a STEM Ambassador and actively participate in public engagement events such as New Scientist Live, Museum After Dark, and Science Cafe to share my knowledge and experience with people.
- a team player and I enjoy working with other people.
I do
- Microwave interdisciplinary science, where microwave can accelerate dielectric sensing and heating process. Cardiff University microwave device to help diabetics.
- RF/Microwave power amplifiers and applicators design, for efficient microwave power generation and delivery, and mmWave on-wafer device characterisation of GaN on Si, GaN on SiC, and GaN on Diamond transistors.
- COMSOL Multiphysics electromagnetic modelling, of microwave circuit design, dielectric sensing and heating problems.
Open for discussion
- If you want to have a chat, get in touch with me by email.
Publication
2025
- Jones, J., Jones, N., Choi, H., Cripps, S. and Porch, A. 2025. A novel microwave applicator for large volume metal powder heating in additive manufacturing. Presented at: APMC 2024, Bali, Indonesia, 17-20 November 20242024 IEEE Asia-Pacific Microwave Conference (APMC). IEEE pp. 1302-1304., (10.1109/apmc60911.2024.10867661)
- Silver, K., Choi, H., Cripps, S. C., Smith, R., Jones, M. O., Richards, E. and Porch, A. 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 20242024 IEEE Asia-Pacific Microwave Conference (APMC). IEEE pp. 814-816., (10.1109/apmc60911.2024.10867565)
- Miles, A., Porch, A., Choi, H., Cripps, S., Brown, H. and Williams, C. F. 2025. Direct measurement of non-thermal microwave effects on bacterial growth and redox dynamics using a novel high-throughput waveguide applicator. Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences (10.1098/rsta.2020.0568)
2024
- Silver, K., Bestow, S., Richardson, J., Nagara, C., Choi, H. and Li, J. 2024. Microwave resonator-based microfluidic sensors fabricated using 3D-printing technology. Presented at: Cardiff University Engineering Research Conference 2023, Cardiff, UK, 12-14 July 2023 Presented at Spezi, E. and Bray, M. eds.Proceedings of the Cardiff University Engineering Research Conference 2023. Cardiff: Cardiff University Press pp. 109-112., (10.18573/conf1.z)
- Lingamgunta, S., Xiao, Y., Choi, H., Christie, G. and Fruk, L. 2024. Microwave-enhanced antibacterial activity of polydopamine–silver hybrid nanoparticles. RSC Advances 14, pp. 8331-8340. (10.1039/d3ra07543e)
- 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)
- Choi, H., Luzio, S. and Porch, A. 2024. Microwave non-invasive blood glucose monitor: Wireless implementation and challenges. Presented at: 54th European Microwave Conference (EuMC), Paris, France, 24-26 September 20242024 54th European Microwave Conference (EuMC). IEEE pp. 493-496., (10.23919/eumc61614.2024.10732840)
2023
- 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)
- Williams, C. F. et al. 2023. Non-thermal disruption of β-adrenergic receptor-activated Ca2+ signalling and apoptosis in human ES-derived cardiomyocytes by microwave electric fields at 2.4 GHz. Biochemical and Biophysical Research Communications 661, pp. 89-98. (10.1016/j.bbrc.2023.04.038)
- Sauchelli, S. et al. 2023. Public attitudes towards the use of novel technologies in their future healthcare: a UK survey. BMC Medical Informatics and Decision Making 23, article number: 38. (10.1186/s12911-023-02118-2)
- Magri, G. et al. 2023. An in-situ study of the thermal decomposition of 2,2'-azobis(2-methylpropionitrile) radical chemistry using a dual-mode EPR resonator. Research on Chemical Intermediates 49, pp. 289-305. (10.1007/s11164-022-04861-z)
2022
- Choi, H., Barker, E., Abduljabar, A. A., Anumba, D. and Porch, A. 2022. Cervical tissue hydration level monitoring by a resonant microwave coaxial probe. Sensors 22(23), article number: 9527. (10.3390/s22239527)
- Barter, M. et al. 2022. Design considerations of a dual mode X-band EPR resonator for rapid in-situ microwave heating. Applied Magnetic Resonance 53, pp. 861-874. (10.1007/s00723-022-01463-1)
2021
- Riedel, R. et al. 2021. Superalkali-alkalide interactions and ion pairing in low-polarity solvents. Journal of the American Chemical Society 143(10), pp. 3934-3943. (10.1021/jacs.1c00115)
2020
- Ahortor, E. K., Malyshev, D., Williams, C. F., Choi, H., Lees, J., Porch, A. and Baillie, L. 2020. The biological effect of 2.45 GHz microwaves on the viability and permeability of bacterial and yeast cells. Journal of Applied Physics 127(204902), pp. IMPORTED. (10.1063/1.5145009)
- Folli, A. et al. 2020. A novel dual mode X-band EPR resonator for rapid in situ microwave heating. Journal of Magnetic Resonance 310, article number: 106644. (10.1016/j.jmr.2019.106644)
2019
- Hamzah, H., Ahortor, E., Malyshev, D., Choi, H., Lees, J., Baillie, L. and Porch, A. 2019. A compact microwave applicator for the rapid detection of clostridium difficile. Presented at: 2019 IEEE MTT-S International Microwave Biomedical Conference (IMBioC), Nanjing, China, 6-8 May 20192019 IEEE MTT-S International Microwave Biomedical Conference (IMBioC). IEEE, (10.1109/IMBIOC.2019.8777882)
- Williams, C. F. et al. 2019. Bioluminescence of Vibrio fischeri: bacteria respond quickly and sensitively to pulsed microwave electric (but not magnetic) fields. Journal of Biomedical Optics 24(5), article number: 51412. (10.1117/1.JBO.24.5.051412)
- Abduljabar, A. A., Choi, H. and Porch, A. 2019. Novel variable coupling technique for microwave liquid heating and sensing. Presented at: 18th Mediterranean Microwave Symposium (MMS) 2018, Istanbul, Turkey, 31 October - 2 November 201818th Mediterranean Microwave Symposium (MMS) 2018. IEEE pp. -., (10.1109/MMS.2018.8612033)
2018
- Choi, H., Luzio, S., Beutler, J. and Porch, A. 2018. Microwave noninvasive blood glucose monitoring sensor: penetration depth and sensitivity analysis. Presented at: IEEE MTT-S International Microwave Biomedical Conference 2018, Philadelphia, PA, US, 14-15 Jun 2018IEEE International Microwave Biomedical Conference (IMBioC). IEEE pp. 52-54., (10.1109/IMBIOC.2018.8428850)
2017
- Choi, H. 2017. Recent developments in minimally and truly non-invasive blood glucose monitoring techniques. Presented at: IEEE Sensors 2017, Glasgow, Scotland, 29 October - 1 November 20172017 IEEE Sensors Conference Proceedings. IEEE pp. 1-3., (10.1109/ICSENS.2017.8234291)
- Choi, H., Luzio, S., Beutler, J. and Porch, A. 2017. Microwave noninvasive blood glucose monitoring sensor: human clinical trial results. Presented at: IEEE MTT-S International Microwave Symposium 2017, Honolulu, Hawaii, USA, 4 - 9 June 2017Microwave Symposium (IMS), 2017 IEEE MTT-S International. pp. 876-879., (10.1109/MWSYM.2017.8058721)
- Abduljabar, A., Choi, H. and Porch, A. 2017. Dual feeding cavity resonator for efficiency enhancement in liquid heating applications. Electronics letters (10.1049/el.2017.2557)
2016
- Choi, H., Luzio, S. and Porch, A. 2016. Dielectric properties of aqueous glucose solutions using microwave cavity and coaxial probe. Presented at: 2nd Australian Microwave Symposium, Adelaide, Australia, 11-12 February 20162016 IEEE 2nd Australian Microwave Symposium (AMS 2016). Piscataway, NJ: Institute of Electrical and Electronics Engineers (IEEE) pp. 7-8., (10.1109/AUSMS.2016.7593467)
2015
- Abduljabar, A., Choi, H., Barrow, D. and Porch, A. 2015. Adaptive coupling of resonators for efficient microwave heating of microfluidic systems. IEEE Transactions on Microwave Theory and Techniques 63(11), pp. 3681-3690. (10.1109/TMTT.2015.2478004)
- Imtiaz, A., Lees, J., Choi, H. and Joshi, L. T. 2015. An integrated continuous class-F-1 mode power amplifier design approach for microwave enhanced portable diagnostic applications. IEEE Transactions on Microwave Theory and Techniques 63(10), pp. 3007-3015. (10.1109/TMTT.2015.2472417)
- Choi, H., Naylon, J., Luzio, S., Buetler, J., Birchall, J., Martin, C. and Porch, A. 2015. Design and in vitro interference test of microwave noninvasive blood glucose monitoring sensor. IEEE Transactions on Microwave Theory and Techniques 63(10), pp. 3016-3025. (10.1109/TMTT.2015.2472019)
- Imtiaz, A., Hartley, J., Choi, H. and Lees, J. 2015. A high power high efficiency integrated solid-state microwave heating structure for portable diagnostic healthcare applications. Presented at: IEEE MTT-S 2014 IEEE International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications, London, 8-10 December 20142014 IEEE MTT-S international microwave workshop series on RF and wireless technologies for biomedical and healthcare applications (IMWS-Bio). IEEE pp. 1-3., (10.1109/IMWS-BIO.2014.7032437)
- Choi, H., Jack, N., Luzio, S., Beutler, J. and Porch, A. 2015. Design of continuous non-invasive blood glucose monitoring sensor based on a microwave split ring resonator. Presented at: IEEE MTT-S 2014 IEEE International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications, London, 8-10 December 20142014 IEEE MTT-S International Microwave Workshop series on RF and wireless technologies for biomedical and healthcare applications (IMWS-Bio). IEEE pp. 1-3., (10.1109/IMWS-BIO.2014.7032398)
2014
- Cuenca, J., Choi, H., Hartley, J. and Porch, A. 2014. Microwave detection of photodielectric effects in antimony tin oxide. Presented at: 2014 International Symposium on Information Technology Convergence (ISITC 2014), Jeonju, Republic of Korea, 30-31 October 2014.
- Choi, H., Cuenca, J., Hartley, J. and Porch, A. 2014. Observation of change in microwave properties during solid to liquid phase transformation of gallium. Presented at: 2014 International Symposium on Information Technology Convergence (ISITC 2014), Jeonju, Republic of Korea, 30-31 October 2014.
- Hartley, J., Lees, J., Cuenca, J. and Choi, H. 2014. Assessment of machine oil quality by microwave cavity perturbation method. Presented at: 2014 International Symposium on Information Technology Convergence (ISITC 2014), Jeonju, Republic of Korea, 30-31 October 2014.
- Choi, H., Cuenca, J. A., Attard, G. and Porch, A. 2014. A novel concentration detection method of hydrogen peroxide using microwave cavity perturbation technique. Presented at: 44th European Microwave Conference (EuMC) 2014, Rome, Italy, 6-9 October 201444th European Microwave Conference (EuMC 2014). Picastaway, NJ: IEEE pp. 632-635., (10.1109/EuMC.2014.6986513)
- Yang, F., Lees, J., Choi, H., Yu, H. and Tasker, P. J. 2014. Continuous class BJ power amplifier with DGS output matching. Presented at: 83rd ARFTG Microwave Measurement Conference 2014, Tampa, USA, 6 June 2014Microwave Symposium (IMS), 2014 IEEE MTT-S International. IEEE pp. 1-4., (10.1109/MWSYM.2014.6848562)
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)
2012
- Bensmida, S. et al. 2012. Nonlinear envelope tracking for efficiency optimization of power amplifiers. Presented at: 7th European Microwave Integrated Circuits Conference (EuMIC) 2012, Amsterdam, The Netherlands, 29-30 October 20127th European Microwave Integrated Circuits Conference (EuMIC), 2012. Picastaway, NJ: IEEE pp. 480-483.
- McGenn, W., Choi, H., Lees, J., Uren, M. J., Benedikt, J. and Tasker, P. J. 2012. Development of a RF waveform stress test procedure for GaN HFETs subjected to infinite VSWR sweeps. 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.2012.6259725)
- Chaudhary, G., Choi, H., Jeong, Y., Lim, J. and Kim, C. D. 2012. Design of group delay time controller based on a reflective parallel resonator. Etri Journal 34(2), pp. 210-215.
- Akmal, M. et al. 2012. Characterization of electrical memory effects for complex multi-tone excitations using broadband active baseband load-pull. Presented at: 7th European Microwave Integrated Circuits Conference, Amsterdam, The Netherlands, 29-30 October 20127th European Microwave Integrated Circuits Conference (EuMIC), 2012. Picastaway, NJ: IEEE pp. 885-888.
2011
- Chaudhary, G., Choi, H., Jeong, Y., Lim, J., Kim, D. and Kim, J. 2011. Design of dual-band bandpass filter using DGS with controllable second passband. IEEE Microwave and Wireless Components Letters 21(11), pp. 589-591. (10.1109/LMWC.2011.2167140)
- Choi, H., Chaudhary, G., Moon, T., Jeong, Y., Lim, J. and Kim, C. D. 2011. A design of composite negative group delay circuit with lower signal attenuation for performance improvement of power amplifier linearization techniques. Presented at: 2011 IEEE/MTT-S International Microwave Symposium, Baltimore, MD, USA, 5-10 June 20112011 IEEE MTT-S International Microwave Symposium Digest (MTT). Picastaway, NJ: IEEE pp. 1-4., (10.1109/MWSYM.2011.5972599)
- Choi, H., Jeong, Y., Lim, J., Eom, S. and Jung, Y. 2011. A novel design for a dual-band negative group delay circuit. IEEE Microwave and Wireless Components Letters 21(1), pp. 19-21. (10.1109/LMWC.2010.2089675)
2010
- Choi, H., Jeong, Y., Kim, C. D. and Kenney, J. S. 2010. Bandwidth enhancement of an analog feedback amplifier by employing a negative group delay circuit. Progress In Electromagnetics Research 105, pp. 253-272. (10.2528/PIER10041808)
- Choi, H., Jeong, Y., Kim, C. D. and Kenney, J. S. 2010. Efficiency enhancement of feedforward amplifiers by employing a negative group-delay circuit. IEEE Transactions on Microwave Theory and Techniques 58(5), pp. 1116-1125. (10.1109/TMTT.2010.2045576)
- Jeong, Y., Choi, H. and Kim, C. D. 2010. Experimental verification for time advancement of negative group delay in RF electronic circuits. Electronics letters 46(4), pp. 306-307. (10.1049/el.2010.3147)
2009
- Choi, H., Song, K., Jeong, Y., Kenney, J. S. and Kim, C. D. 2009. Propagation delay matched CMOS 0.18 μm frequency doubler for L-band application. Microwave and Optical Technology Letters 51(7), pp. 1729-1732. (10.1002/mop.24420)
- Choi, H., Lim, J. and Jeong, Y. 2009. Harmonics terminated L-band frequency quadrupler using composite right/left-handed transmission line. Electronics letters 45(4), pp. 208-210. (10.1049/el:20093331)
- Choi, H., Jeong, Y., Kenney, J. S. and Kim, C. D. 2009. Dual-band feedforward linear power amplifier for digital cellular and IMT-2000 base-station. Microwave and Optical Technology Letters 51(4), pp. 922-926. (10.1002/mop.24198)
2008
- Choi, H., Jeong, Y., Kenney, J. S. and Kim, C. 2008. Cross cancellation technique employing an error amplifier [Letter]. IEEE Microwave and Wireless Components Letters 18(7), pp. 488-490.
- Choi, H., Kenney, J. S., Jeong, Y. and Kim, C. 2008. Design of a microwave group delay time adjuster and its application to a feedforward power amplifier. Microwave Journal 51(2), pp. 88-100.
- Song, K., Jeong, Y. and Choi, H. 2008. Varactor tunned high-Q aictive inductor with broadband tuning range. Presented at: International SoC Design Conference, Busan, South Korea, 24-25 November 20082008 International Soc Design Conference (Isocc). Picastaway, NJ: IEEE pp. III-42., (10.1109/SOCDC.2008.4815740)
- Choi, H., Song, K., Kim, C. D. and Jeong, Y. 2008. Synthesis of negative group delay time circuit. Presented at: 2008 Asia- Pacific Microwave Conference, Macau, China, 16-20 December 20082008 Asia- Pacific Microwave Conference APMC 2008. Picastaway: IEEE pp. 1-4., (10.1109/APMC.2008.4958248)
- Song, K., Choi, H., Kim, C. D., Kenney, J. S. and Jeong, Y. 2008. Delay matching compensated CMOS microwave frequency doubler. Presented at: 38th European Microwave Conference 2008, Amsterdam, The Netherlands, 27-31 October 200838th European Microwave Conference 2008. Picastaway: IEEE pp. 464-467., (10.1109/EUMC.2008.4751489)
2007
- Park, S., Choi, H. and Jeong, Y. 2007. Microwave group delay time adjuster using parallel resonator. IEEE Microwave and Wireless Components Letters 17(2), pp. 109-111. (10.1109/LMWC.2006.890331)
- Choi, H., Jeong, Y., Kenney, J. S. and Kim, C. D. 2007. Cross post-distortion balanced power amplifier. Presented at: IEEE/MTT-S International Microwave Symposium 2007, Honolulu, USA, 3-8 June 2007IEEE/MTT-S International Microwave Symposium, 2007. Picastaway, NJ: IEEE pp. 1115-1118., (10.1109/MWSYM.2007.380289)
- Jeong, S., Choi, H., Jeong, Y., Kenney, J. S. and Kim, C. 2007. High efficiency distributed amplifier using optimum transmission line. Presented at: 2007 European Microwave Conference, Munich, 9-12 October 20072007 European Microwave Conference. Picastaway: IEEE pp. 1085-1088., (10.1109/EUMC.2007.4405386)
- Seo, S., Ryu, N., Choi, H. and Jeong, Y. 2007. Novel high-Q inductor using active inductor structure and feedback parallel resonance circuit. Presented at: 2007 IEEE Radio Frequency Integrated Circuits (RFIC) Symposium, Honolulu, Hawaii, 467-4702007 IEEE Radio Frequency Integrated Circuits (RFIC) Symposium. Picastaway: IEEE pp. 467-470., (10.1109/RFIC.2007.380925)
- Choi, H., Jeong, Y. and Kenney, J. S. 2007. Dual-band feedforward linear power amplifier using equal group delay signal canceller. Presented at: 2007 Asia Pacific Microwave Conference, Bangkok, Thailand, 11-14 Dec 20072007 Asia Pacific Microwave Conference. Picastaway, NJ: IEEE pp. 1-4., (10.1109/APMC.2007.4555143)
- Jeong, S., Choi, H., Jeong, Y., Kenney, J. S. and Kim, C. 2007. High efficiency distributed amplifier using optimum transmission line. Presented at: European Microwave Integrated Circuits Conference (EUMIC), Munich, Germany, 8-10 October 20072007 European Microwave Integrated Circuits Conference. Picastaway, NJ: IEEE pp. 287-290., (10.1109/EMICC.2007.4412705)
- Jeong, S., Choi, H., Jeong, Y., Kenney, J. S. and Kim, C. 2007. High efficiency distributed amplifier using optimum transmission line. Presented at: European Conference on Wireless Technologies (ECWT), Munich, Germany, 8-10 October 20072007 European Conference on Wireless Technologies. Picastaway, NJ: IEEE pp. 367-370., (10.1109/ECWT.2007.4404023)
2006
- Choi, H., Lim, J., Jeong, Y. and Kim, C. 2006. Doherty amplifier using load modulation and phase compensation DGS microstrip line. Presented at: 36th European Microwave Conference 2006, Manchester, England, 10-15 September 20062006 European Microwave Conference. Picastaway: IEEE pp. 352-355., (10.1109/EUMC.2006.281346)
- Lee, J., Park, S., Choi, H., jeong, Y. and Yun, J. 2006. A design of co-channel feedback interference cancellation system using analog control. Presented at: 36th European Microwave Conference, Manchester, England, 10-15 September 20062006 European Microwave Conference. Picastaway, NJ: IEEE pp. 153-156., (10.1109/EUMC.2006.281241)
- Park, S., Ryu, N., Choi, H., Jeong, Y. and Kim, C. 2006. A novel design of frequency multiplier using feedforward technique and defected ground structure. Presented at: 36th European Microwave Conference 2006, Manchester, England, 10-15 September 20062006 European Microwave Conference. Picastaway, NJ: IEEE pp. 224-227., (10.1109/EUMC.2006.281277)
- Choi, H., Lim, J. and Jeong, Y. 2006. A new design of Doherty amplifiers using defected ground structure. IEEE Microwave and Wireless Component Letters 16(12), pp. 687-689. (10.1109/LMWC.2006.885636)
2005
- Choi, H., Jeong, H., Kim, Y., Lim, J., Kim, C. and Jeong, Y. 2005. Dual-band predistortion power amplifier for digital cellular and IMT-2000 base-station application. Presented at: Asia-Pacific Microwave Conference 2005 (APCM 2005), Suzhou, China, 4-7 December 2005 Presented at Hong, W., Cui, T. J. and Fang, D. G. eds.Microwave Conference Proceedings, 2005, APMC 2005, Asia-Pacific Conference Proceedings, Vol. 1. Picastaway: IEEE pp. 1., (10.1109/APMC.2005.1606225)
Articles
- Miles, A., Porch, A., Choi, H., Cripps, S., Brown, H. and Williams, C. F. 2025. Direct measurement of non-thermal microwave effects on bacterial growth and redox dynamics using a novel high-throughput waveguide applicator. Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences (10.1098/rsta.2020.0568)
- Lingamgunta, S., Xiao, Y., Choi, H., Christie, G. and Fruk, L. 2024. Microwave-enhanced antibacterial activity of polydopamine–silver hybrid nanoparticles. RSC Advances 14, pp. 8331-8340. (10.1039/d3ra07543e)
- 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)
- Williams, C. F. et al. 2023. Non-thermal disruption of β-adrenergic receptor-activated Ca2+ signalling and apoptosis in human ES-derived cardiomyocytes by microwave electric fields at 2.4 GHz. Biochemical and Biophysical Research Communications 661, pp. 89-98. (10.1016/j.bbrc.2023.04.038)
- Sauchelli, S. et al. 2023. Public attitudes towards the use of novel technologies in their future healthcare: a UK survey. BMC Medical Informatics and Decision Making 23, article number: 38. (10.1186/s12911-023-02118-2)
- Magri, G. et al. 2023. An in-situ study of the thermal decomposition of 2,2'-azobis(2-methylpropionitrile) radical chemistry using a dual-mode EPR resonator. Research on Chemical Intermediates 49, pp. 289-305. (10.1007/s11164-022-04861-z)
- Choi, H., Barker, E., Abduljabar, A. A., Anumba, D. and Porch, A. 2022. Cervical tissue hydration level monitoring by a resonant microwave coaxial probe. Sensors 22(23), article number: 9527. (10.3390/s22239527)
- Barter, M. et al. 2022. Design considerations of a dual mode X-band EPR resonator for rapid in-situ microwave heating. Applied Magnetic Resonance 53, pp. 861-874. (10.1007/s00723-022-01463-1)
- Riedel, R. et al. 2021. Superalkali-alkalide interactions and ion pairing in low-polarity solvents. Journal of the American Chemical Society 143(10), pp. 3934-3943. (10.1021/jacs.1c00115)
- Ahortor, E. K., Malyshev, D., Williams, C. F., Choi, H., Lees, J., Porch, A. and Baillie, L. 2020. The biological effect of 2.45 GHz microwaves on the viability and permeability of bacterial and yeast cells. Journal of Applied Physics 127(204902), pp. IMPORTED. (10.1063/1.5145009)
- Folli, A. et al. 2020. A novel dual mode X-band EPR resonator for rapid in situ microwave heating. Journal of Magnetic Resonance 310, article number: 106644. (10.1016/j.jmr.2019.106644)
- Williams, C. F. et al. 2019. Bioluminescence of Vibrio fischeri: bacteria respond quickly and sensitively to pulsed microwave electric (but not magnetic) fields. Journal of Biomedical Optics 24(5), article number: 51412. (10.1117/1.JBO.24.5.051412)
- Abduljabar, A., Choi, H. and Porch, A. 2017. Dual feeding cavity resonator for efficiency enhancement in liquid heating applications. Electronics letters (10.1049/el.2017.2557)
- Abduljabar, A., Choi, H., Barrow, D. and Porch, A. 2015. Adaptive coupling of resonators for efficient microwave heating of microfluidic systems. IEEE Transactions on Microwave Theory and Techniques 63(11), pp. 3681-3690. (10.1109/TMTT.2015.2478004)
- Imtiaz, A., Lees, J., Choi, H. and Joshi, L. T. 2015. An integrated continuous class-F-1 mode power amplifier design approach for microwave enhanced portable diagnostic applications. IEEE Transactions on Microwave Theory and Techniques 63(10), pp. 3007-3015. (10.1109/TMTT.2015.2472417)
- Choi, H., Naylon, J., Luzio, S., Buetler, J., Birchall, J., Martin, C. and Porch, A. 2015. Design and in vitro interference test of microwave noninvasive blood glucose monitoring sensor. IEEE Transactions on Microwave Theory and Techniques 63(10), pp. 3016-3025. (10.1109/TMTT.2015.2472019)
- 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)
- Chaudhary, G., Choi, H., Jeong, Y., Lim, J. and Kim, C. D. 2012. Design of group delay time controller based on a reflective parallel resonator. Etri Journal 34(2), pp. 210-215.
- Chaudhary, G., Choi, H., Jeong, Y., Lim, J., Kim, D. and Kim, J. 2011. Design of dual-band bandpass filter using DGS with controllable second passband. IEEE Microwave and Wireless Components Letters 21(11), pp. 589-591. (10.1109/LMWC.2011.2167140)
- Choi, H., Jeong, Y., Lim, J., Eom, S. and Jung, Y. 2011. A novel design for a dual-band negative group delay circuit. IEEE Microwave and Wireless Components Letters 21(1), pp. 19-21. (10.1109/LMWC.2010.2089675)
- Choi, H., Jeong, Y., Kim, C. D. and Kenney, J. S. 2010. Bandwidth enhancement of an analog feedback amplifier by employing a negative group delay circuit. Progress In Electromagnetics Research 105, pp. 253-272. (10.2528/PIER10041808)
- Choi, H., Jeong, Y., Kim, C. D. and Kenney, J. S. 2010. Efficiency enhancement of feedforward amplifiers by employing a negative group-delay circuit. IEEE Transactions on Microwave Theory and Techniques 58(5), pp. 1116-1125. (10.1109/TMTT.2010.2045576)
- Jeong, Y., Choi, H. and Kim, C. D. 2010. Experimental verification for time advancement of negative group delay in RF electronic circuits. Electronics letters 46(4), pp. 306-307. (10.1049/el.2010.3147)
- Choi, H., Song, K., Jeong, Y., Kenney, J. S. and Kim, C. D. 2009. Propagation delay matched CMOS 0.18 μm frequency doubler for L-band application. Microwave and Optical Technology Letters 51(7), pp. 1729-1732. (10.1002/mop.24420)
- Choi, H., Lim, J. and Jeong, Y. 2009. Harmonics terminated L-band frequency quadrupler using composite right/left-handed transmission line. Electronics letters 45(4), pp. 208-210. (10.1049/el:20093331)
- Choi, H., Jeong, Y., Kenney, J. S. and Kim, C. D. 2009. Dual-band feedforward linear power amplifier for digital cellular and IMT-2000 base-station. Microwave and Optical Technology Letters 51(4), pp. 922-926. (10.1002/mop.24198)
- Choi, H., Jeong, Y., Kenney, J. S. and Kim, C. 2008. Cross cancellation technique employing an error amplifier [Letter]. IEEE Microwave and Wireless Components Letters 18(7), pp. 488-490.
- Choi, H., Kenney, J. S., Jeong, Y. and Kim, C. 2008. Design of a microwave group delay time adjuster and its application to a feedforward power amplifier. Microwave Journal 51(2), pp. 88-100.
- Park, S., Choi, H. and Jeong, Y. 2007. Microwave group delay time adjuster using parallel resonator. IEEE Microwave and Wireless Components Letters 17(2), pp. 109-111. (10.1109/LMWC.2006.890331)
- Choi, H., Lim, J. and Jeong, Y. 2006. A new design of Doherty amplifiers using defected ground structure. IEEE Microwave and Wireless Component Letters 16(12), pp. 687-689. (10.1109/LMWC.2006.885636)
Conferences
- Jones, J., Jones, N., Choi, H., Cripps, S. and Porch, A. 2025. A novel microwave applicator for large volume metal powder heating in additive manufacturing. Presented at: APMC 2024, Bali, Indonesia, 17-20 November 20242024 IEEE Asia-Pacific Microwave Conference (APMC). IEEE pp. 1302-1304., (10.1109/apmc60911.2024.10867661)
- Silver, K., Choi, H., Cripps, S. C., Smith, R., Jones, M. O., Richards, E. and Porch, A. 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 20242024 IEEE Asia-Pacific Microwave Conference (APMC). IEEE pp. 814-816., (10.1109/apmc60911.2024.10867565)
- Silver, K., Bestow, S., Richardson, J., Nagara, C., Choi, H. and Li, J. 2024. Microwave resonator-based microfluidic sensors fabricated using 3D-printing technology. Presented at: Cardiff University Engineering Research Conference 2023, Cardiff, UK, 12-14 July 2023 Presented at Spezi, E. and Bray, M. eds.Proceedings of the Cardiff University Engineering Research Conference 2023. Cardiff: Cardiff University Press pp. 109-112., (10.18573/conf1.z)
- 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)
- Choi, H., Luzio, S. and Porch, A. 2024. Microwave non-invasive blood glucose monitor: Wireless implementation and challenges. Presented at: 54th European Microwave Conference (EuMC), Paris, France, 24-26 September 20242024 54th European Microwave Conference (EuMC). IEEE pp. 493-496., (10.23919/eumc61614.2024.10732840)
- Hamzah, H., Ahortor, E., Malyshev, D., Choi, H., Lees, J., Baillie, L. and Porch, A. 2019. A compact microwave applicator for the rapid detection of clostridium difficile. Presented at: 2019 IEEE MTT-S International Microwave Biomedical Conference (IMBioC), Nanjing, China, 6-8 May 20192019 IEEE MTT-S International Microwave Biomedical Conference (IMBioC). IEEE, (10.1109/IMBIOC.2019.8777882)
- Abduljabar, A. A., Choi, H. and Porch, A. 2019. Novel variable coupling technique for microwave liquid heating and sensing. Presented at: 18th Mediterranean Microwave Symposium (MMS) 2018, Istanbul, Turkey, 31 October - 2 November 201818th Mediterranean Microwave Symposium (MMS) 2018. IEEE pp. -., (10.1109/MMS.2018.8612033)
- Choi, H., Luzio, S., Beutler, J. and Porch, A. 2018. Microwave noninvasive blood glucose monitoring sensor: penetration depth and sensitivity analysis. Presented at: IEEE MTT-S International Microwave Biomedical Conference 2018, Philadelphia, PA, US, 14-15 Jun 2018IEEE International Microwave Biomedical Conference (IMBioC). IEEE pp. 52-54., (10.1109/IMBIOC.2018.8428850)
- Choi, H. 2017. Recent developments in minimally and truly non-invasive blood glucose monitoring techniques. Presented at: IEEE Sensors 2017, Glasgow, Scotland, 29 October - 1 November 20172017 IEEE Sensors Conference Proceedings. IEEE pp. 1-3., (10.1109/ICSENS.2017.8234291)
- Choi, H., Luzio, S., Beutler, J. and Porch, A. 2017. Microwave noninvasive blood glucose monitoring sensor: human clinical trial results. Presented at: IEEE MTT-S International Microwave Symposium 2017, Honolulu, Hawaii, USA, 4 - 9 June 2017Microwave Symposium (IMS), 2017 IEEE MTT-S International. pp. 876-879., (10.1109/MWSYM.2017.8058721)
- Choi, H., Luzio, S. and Porch, A. 2016. Dielectric properties of aqueous glucose solutions using microwave cavity and coaxial probe. Presented at: 2nd Australian Microwave Symposium, Adelaide, Australia, 11-12 February 20162016 IEEE 2nd Australian Microwave Symposium (AMS 2016). Piscataway, NJ: Institute of Electrical and Electronics Engineers (IEEE) pp. 7-8., (10.1109/AUSMS.2016.7593467)
- Imtiaz, A., Hartley, J., Choi, H. and Lees, J. 2015. A high power high efficiency integrated solid-state microwave heating structure for portable diagnostic healthcare applications. Presented at: IEEE MTT-S 2014 IEEE International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications, London, 8-10 December 20142014 IEEE MTT-S international microwave workshop series on RF and wireless technologies for biomedical and healthcare applications (IMWS-Bio). IEEE pp. 1-3., (10.1109/IMWS-BIO.2014.7032437)
- Choi, H., Jack, N., Luzio, S., Beutler, J. and Porch, A. 2015. Design of continuous non-invasive blood glucose monitoring sensor based on a microwave split ring resonator. Presented at: IEEE MTT-S 2014 IEEE International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications, London, 8-10 December 20142014 IEEE MTT-S International Microwave Workshop series on RF and wireless technologies for biomedical and healthcare applications (IMWS-Bio). IEEE pp. 1-3., (10.1109/IMWS-BIO.2014.7032398)
- Cuenca, J., Choi, H., Hartley, J. and Porch, A. 2014. Microwave detection of photodielectric effects in antimony tin oxide. Presented at: 2014 International Symposium on Information Technology Convergence (ISITC 2014), Jeonju, Republic of Korea, 30-31 October 2014.
- Choi, H., Cuenca, J., Hartley, J. and Porch, A. 2014. Observation of change in microwave properties during solid to liquid phase transformation of gallium. Presented at: 2014 International Symposium on Information Technology Convergence (ISITC 2014), Jeonju, Republic of Korea, 30-31 October 2014.
- Hartley, J., Lees, J., Cuenca, J. and Choi, H. 2014. Assessment of machine oil quality by microwave cavity perturbation method. Presented at: 2014 International Symposium on Information Technology Convergence (ISITC 2014), Jeonju, Republic of Korea, 30-31 October 2014.
- Choi, H., Cuenca, J. A., Attard, G. and Porch, A. 2014. A novel concentration detection method of hydrogen peroxide using microwave cavity perturbation technique. Presented at: 44th European Microwave Conference (EuMC) 2014, Rome, Italy, 6-9 October 201444th European Microwave Conference (EuMC 2014). Picastaway, NJ: IEEE pp. 632-635., (10.1109/EuMC.2014.6986513)
- Yang, F., Lees, J., Choi, H., Yu, H. and Tasker, P. J. 2014. Continuous class BJ power amplifier with DGS output matching. Presented at: 83rd ARFTG Microwave Measurement Conference 2014, Tampa, USA, 6 June 2014Microwave Symposium (IMS), 2014 IEEE MTT-S International. IEEE pp. 1-4., (10.1109/MWSYM.2014.6848562)
- Bensmida, S. et al. 2012. Nonlinear envelope tracking for efficiency optimization of power amplifiers. Presented at: 7th European Microwave Integrated Circuits Conference (EuMIC) 2012, Amsterdam, The Netherlands, 29-30 October 20127th European Microwave Integrated Circuits Conference (EuMIC), 2012. Picastaway, NJ: IEEE pp. 480-483.
- McGenn, W., Choi, H., Lees, J., Uren, M. J., Benedikt, J. and Tasker, P. J. 2012. Development of a RF waveform stress test procedure for GaN HFETs subjected to infinite VSWR sweeps. 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.2012.6259725)
- Akmal, M. et al. 2012. Characterization of electrical memory effects for complex multi-tone excitations using broadband active baseband load-pull. Presented at: 7th European Microwave Integrated Circuits Conference, Amsterdam, The Netherlands, 29-30 October 20127th European Microwave Integrated Circuits Conference (EuMIC), 2012. Picastaway, NJ: IEEE pp. 885-888.
- Choi, H., Chaudhary, G., Moon, T., Jeong, Y., Lim, J. and Kim, C. D. 2011. A design of composite negative group delay circuit with lower signal attenuation for performance improvement of power amplifier linearization techniques. Presented at: 2011 IEEE/MTT-S International Microwave Symposium, Baltimore, MD, USA, 5-10 June 20112011 IEEE MTT-S International Microwave Symposium Digest (MTT). Picastaway, NJ: IEEE pp. 1-4., (10.1109/MWSYM.2011.5972599)
- Song, K., Jeong, Y. and Choi, H. 2008. Varactor tunned high-Q aictive inductor with broadband tuning range. Presented at: International SoC Design Conference, Busan, South Korea, 24-25 November 20082008 International Soc Design Conference (Isocc). Picastaway, NJ: IEEE pp. III-42., (10.1109/SOCDC.2008.4815740)
- Choi, H., Song, K., Kim, C. D. and Jeong, Y. 2008. Synthesis of negative group delay time circuit. Presented at: 2008 Asia- Pacific Microwave Conference, Macau, China, 16-20 December 20082008 Asia- Pacific Microwave Conference APMC 2008. Picastaway: IEEE pp. 1-4., (10.1109/APMC.2008.4958248)
- Song, K., Choi, H., Kim, C. D., Kenney, J. S. and Jeong, Y. 2008. Delay matching compensated CMOS microwave frequency doubler. Presented at: 38th European Microwave Conference 2008, Amsterdam, The Netherlands, 27-31 October 200838th European Microwave Conference 2008. Picastaway: IEEE pp. 464-467., (10.1109/EUMC.2008.4751489)
- Choi, H., Jeong, Y., Kenney, J. S. and Kim, C. D. 2007. Cross post-distortion balanced power amplifier. Presented at: IEEE/MTT-S International Microwave Symposium 2007, Honolulu, USA, 3-8 June 2007IEEE/MTT-S International Microwave Symposium, 2007. Picastaway, NJ: IEEE pp. 1115-1118., (10.1109/MWSYM.2007.380289)
- Jeong, S., Choi, H., Jeong, Y., Kenney, J. S. and Kim, C. 2007. High efficiency distributed amplifier using optimum transmission line. Presented at: 2007 European Microwave Conference, Munich, 9-12 October 20072007 European Microwave Conference. Picastaway: IEEE pp. 1085-1088., (10.1109/EUMC.2007.4405386)
- Seo, S., Ryu, N., Choi, H. and Jeong, Y. 2007. Novel high-Q inductor using active inductor structure and feedback parallel resonance circuit. Presented at: 2007 IEEE Radio Frequency Integrated Circuits (RFIC) Symposium, Honolulu, Hawaii, 467-4702007 IEEE Radio Frequency Integrated Circuits (RFIC) Symposium. Picastaway: IEEE pp. 467-470., (10.1109/RFIC.2007.380925)
- Choi, H., Jeong, Y. and Kenney, J. S. 2007. Dual-band feedforward linear power amplifier using equal group delay signal canceller. Presented at: 2007 Asia Pacific Microwave Conference, Bangkok, Thailand, 11-14 Dec 20072007 Asia Pacific Microwave Conference. Picastaway, NJ: IEEE pp. 1-4., (10.1109/APMC.2007.4555143)
- Jeong, S., Choi, H., Jeong, Y., Kenney, J. S. and Kim, C. 2007. High efficiency distributed amplifier using optimum transmission line. Presented at: European Microwave Integrated Circuits Conference (EUMIC), Munich, Germany, 8-10 October 20072007 European Microwave Integrated Circuits Conference. Picastaway, NJ: IEEE pp. 287-290., (10.1109/EMICC.2007.4412705)
- Jeong, S., Choi, H., Jeong, Y., Kenney, J. S. and Kim, C. 2007. High efficiency distributed amplifier using optimum transmission line. Presented at: European Conference on Wireless Technologies (ECWT), Munich, Germany, 8-10 October 20072007 European Conference on Wireless Technologies. Picastaway, NJ: IEEE pp. 367-370., (10.1109/ECWT.2007.4404023)
- Choi, H., Lim, J., Jeong, Y. and Kim, C. 2006. Doherty amplifier using load modulation and phase compensation DGS microstrip line. Presented at: 36th European Microwave Conference 2006, Manchester, England, 10-15 September 20062006 European Microwave Conference. Picastaway: IEEE pp. 352-355., (10.1109/EUMC.2006.281346)
- Lee, J., Park, S., Choi, H., jeong, Y. and Yun, J. 2006. A design of co-channel feedback interference cancellation system using analog control. Presented at: 36th European Microwave Conference, Manchester, England, 10-15 September 20062006 European Microwave Conference. Picastaway, NJ: IEEE pp. 153-156., (10.1109/EUMC.2006.281241)
- Park, S., Ryu, N., Choi, H., Jeong, Y. and Kim, C. 2006. A novel design of frequency multiplier using feedforward technique and defected ground structure. Presented at: 36th European Microwave Conference 2006, Manchester, England, 10-15 September 20062006 European Microwave Conference. Picastaway, NJ: IEEE pp. 224-227., (10.1109/EUMC.2006.281277)
- Choi, H., Jeong, H., Kim, Y., Lim, J., Kim, C. and Jeong, Y. 2005. Dual-band predistortion power amplifier for digital cellular and IMT-2000 base-station application. Presented at: Asia-Pacific Microwave Conference 2005 (APCM 2005), Suzhou, China, 4-7 December 2005 Presented at Hong, W., Cui, T. J. and Fang, D. G. eds.Microwave Conference Proceedings, 2005, APMC 2005, Asia-Pacific Conference Proceedings, Vol. 1. Picastaway: IEEE pp. 1., (10.1109/APMC.2005.1606225)
Research
Research aim
The aim of my research is to improve quality of life of people, therefore I focus primarily on the translation of laboratory-based technology into real-world application, through feasibility test, scaling up and commercialisation.
Show-case: Microwave Non-invasive Blood Glucose Monitor
https://youtu.be/CrHd9ClCfD4
Funding
| Title | People | Funder | Value | Duration |
| UKRI Cross Research Council Responsive Mode Round 1, | L Baillie (PI), A Porch (Co-I), H Choi (Co-I), J Lees (Co-I), NJ Copner (Co-I), A Gibson (Co-I), G Hewinson (Co-I) | UKRI (EPSRC+MRC) | £1,201, 669 | 02/2025 - 01/2027 |
| High efficiency power amplifier | H Choi (PI), R Quaglia (Co-I) | RFHIC | £40,000 | 03/2023 - 06/2023 |
| Knowledge Transfer Partnership | A Porch (PI), H Choi (Co-I) | Innovate UK | £284,000 | 04/2023 - 03/2025 |
| Non-invasive blood glucose monitor | H Choi (PI), A Porch (Co-I) | GlucoRX | £15,000 | 05/2022 - 07/2022 |
| Non-invasive blood glucose monitor | H Choi (PI), A Porch (Co-I) | GlucoRX | £15,000 | 02/2022 - 04/2022 |
| Non-invasive blood glucose monitor | H Choi (PI), A Porch (Co-I) | GlucoRX | £36,000 | 11/2021 - 01/2022 |
| Non-invasive blood glucose monitor | A Porch (PI), H Choi (Co-I) | GlucoRX | £234,700 | 07/2022 |
| GW4-PATH | G Lasseter (PI), H Choi (Co-I) (and others) | GW4 Crucible 2019 Seed-Funding | £5,413 | 07/2019 - 04/2020 |
| Sêr Cymru II Research Fellowship | H Choi | Welsh Government - ERDF | £191,666 | 05/2017 - 04/2020 |
Teaching
Year 3 Tutor
- Electrical and Electronic Engineering (EEE)
Module leader
- EN3024 Engineering Project Management (Year 3)
- EN3400 Individual Project (Year 3)
- EN3420 Degree Apprenticeship Project (Years 4-5)
Contribution
- EN4110 Mechatronics Design Group Project (MEng)
- EN2076 Fields, Waves and Transmission Lines (Year 2)
- Individual Project supervision (Year 3)
- Individual Project supervision (MSc)
Biography
Education and qualifications
- 2011: PhD Linear RF/Microwave High Power Amplifier, Chonbuk National University, Jeonju, Republic of Korea
- 2006: MSc Information and Communication Engineering, Chonbuk National University, Jeonju, Republic of Korea
- 2004: BSc Electronics and Information Engineering, Chonbuk National University, Jeonju, Republic of Korea
Career overview
- 2021-present: Lecturer in High Frequency Engineering
- 2020-2021: As a Sêr Cymru (Star of Wales) Research Fellow at the Centre for High Frequency Engineering, Cardiff University, I am currently working on a GaN-GaME (Gallium Nitride on Diamond) project funded by EPSRC as a collaboration of University of Bristol, University of Cambridge, University of Glasgow, and University of Birmingham.
- 2017-2020: I have worked as a Sêr Cymru (Star of Wales) Research Fellow at the Centre for High Frequency Engineering, Cardiff University, pursuing commercialisation of the microwave non-invasive blood glucose monitoring sensor with an industrial collaborator.
- 2013-2016: I have worked on the development of non-invasive continuous blood glucose monitoring sensor, funded by Wellcome Trust. This includes development of microwave wireless wearable sensor device and a series of clinical trials.
- 2011-2012: I have worked on the development of active harmonic load-pull system for modulated RF waveform using National Instruments’ PXI-based modular instruments by using LabVIEW. With the project funded by Engineering and Physical Sciences Research Council (EPSRC), I had two successful live demonstrations at the exhibition of National Instruments stand (Booth no. 317) in European Microwave Conference 2012 in Amsterdam, and Radio and Wireless Week 2013 in Austin, TX.
Honours and awards
- 2023 Fellow of the Higher Education Academy (FHEA), The Higher Education Academy, UK
- 2018 International Symposium on Information Technology Convergence 2018: Best Paper Award, Jeonju, Republic of Korea
- 2016 GE Healthcare Life Sciences - Sensors Challenge (sponsored by GE Healthcare Life Science): Phase 1 Winner with "Non-invasive Microwave Sensor for Cell Therapeutics"
- 2016 SET for BRITAIN Awards 2016 (sponsored by the UK government): Finalist in Engineering category with “Bloodless, Painless, and Accurate Microwave Continuous Blood Glucose Monitoring Sensor”
- 2010 16th Human Tech Thesis Prize Awards (sponsored by Samsung Electronics): Honor Prize with “Efficiency Enhancement of Feedforward Amplifiers by Employing a Negative Group Delay Circuit”
- 2009 8th Electromagnetic Wave and Broadcasting Paper Contest (sponsored by the Korean Institute of Electromagnetic Engineering Science): Silver Prize with “Efficiency Enhancement of Feed-forward Amplifiers by Employing a Negative Group Delay Circuit”
- 2008 Research achievement contest in 2008 Chonbuk IT-Open Fair (sponsored by Advanced Graduate Education Center of Chonbuk for Electronics and Information Technology-BK21): Creative Research Award with “Digital Controlled Co-channel Feedback Interference Cancellation System with Broadband Cancellation”
- 2008 Student High-Efficiency Power Amplifier Design Competition (sponsored by IEEE MTT-S High Power Amplifier Components Committee): Outstanding Achievement Award with “class-AB power amplifier with 68% PAE at 2.14 GHz”
- 2006 5th Electromagnetic Wave and Broadcasting Paper Contest (sponsored by the Korean Institute of Electromagnetic Engineering Science): Bronze Prize with “Dual-band Feedforward Linear Power Amplifier Using Equal Group Delay Signal Canceller”
Professional memberships
- IEEE Microwave Theory and Techniques Society Technical Committee 28: Member, 2024 - now
- K-TAG (Korea Technology Advisory Group): Member, 2020-now
- IEEE: Member (80444575), 2006 - now
- EuMA (European Microwave Association): Member. 2018 - now
- KIEES (Korean Institute of Electromagnetic Engineering and Science): Member. 2004 - now
- KSEAUK (The Korean Scientists and Engineers Association in the UK): Member. 2019 - now
- ACS (American Chemical Society): Member (32593499), 2023-now
Committees and reviewing
- Grant reviewer
- UKRI (UK Research and Innovation) Future Leaders Fellowship Peer Review College member (link)
- EPSRC (Engineering and Physical Sciences Research Council) Associate Peer Review College Member
- Journal editor
- Guest editor, MDPI SENSORS, special issue on "Blood Glucose Sensors Based on RF, Microwave and mmWave Techniques", 2020-2021 (https://www.mdpi.com/journal/sensors/special_issues/Blood_Glucose_Sensors)
- Journal Topic Board, MDPI SENSORS (https://www.mdpi.com/journal/sensors/topic_editors)
- Co-Guest Editor, MDPI SENSORS, special issue on "RF, Microwave and mm Wave Sensors and Applicators for Chemical, Biological and Medical Applications", 2018 (https://goo.gl/tbYFu2)
- International conference organisation
- Session Convener, Europe-Korea Conference on Science and Technology 2022, Marseille, France (https://ekc2022.org/)
- Session Convener, Europe-Korea Conference on Science and Technology 2021, Cambridge, UK (https://www.ekc2021.org/day2/programme/stdivision/5)
- Science and Technology Programme Committee, Europe-Korea Conference on Science and Technology 2020, Munich, Germany (http://www.ekc2020.org, cancelled due to Covid-19)
- Session Convener, Europe-Korea Conference on Science and Technology 2019, Vienna, Austria (https://2019.europekoreaconference.org/page/programme/stdivision/6)
- Technical Program Co-Chairs, International Symposium on Information Technology Convergence 2018 (http://www.kism.or.kr/ISITC2018/contents.php?pageId=0103)
- Journal reviewer
- IEEE Transactions on Microwave Theory and Techniques
- IEEE Microwave and Wireless Components Letters
- IEEE Transactions on Circuits and Systems I: Regular Papers
- IEEE Transactions on Circuits and Systems II: Express Briefs
- IEEE Transactions on Biomedical Circuits and Systems
- IEEE Transactions on Electron Devices
- IEEE Journal of Electromagnetics, RF and Microwaves in Medicine and Biology
- IEEE Microwave Magazine
- IEEE Sensors Letters
- IET Electronics Letters
- Nature Communications
- Nature Scientific Reports
- Progress in Electromagnetics Research
- MDPI Sensors
- MDPI Electronics
- MDPI Applied Sciences
- MDPI Catalysts
- MDPI Diagnostics
- MDPI Energies
- MDPI Biosensors
- MDPI Materials
- Conference reviewer
- IEEE BioSensors 2023, 2024
- IEEE Sensors 2019, 2020, 2021, 2022, 2023, 2024
- IEEE European Microwave Week 2021, 2022, 2024
- AMPERE 2023
Supervisions
Supervised areas
I am available to supervise PhD, MSc students, project students (undergraduate and postgraduate), interns and visiting students on the following topics:
- Microwave non-invasive sensing problems
- Microwave dielctric characterisation and sensing
- Microwave resonators and cavity perturbation technique
- Microwave sensor electronics design
- Microwave heating problems
- Resonant and non-resonant power applicators
- Bespoke power amplifiers
- Oprimised power amplifier-applicator design
- Microwave circuit problems
- High power amplifiers
- High efficiency amplifiers
- Power amplifier linearisation
- Miniaturised microwave electronics
- Multiphysics modelling problems
- Resonator design
- Microwave continuous and pulsed heating modelling
- I am also open to other disciplines!
Current supervision
| Title | Student | Degree | Year | Role |
| RF methods in additive manufacturing | Jake Jones | PhD | 07/2022-06/2026 | Co-supervisor (25%) |
| Metal-Free Catalyst Development Using Microwaves | Sampurna Das | PhD | 10/2022-09/2026 | Co-supervisor (25%) |
Current supervision
Contact Details
ChoiH1@cardiff.ac.uk
Queen's Buildings - Central Building, Room Room E3.25, 5 The Parade, Newport Road, Cardiff, CF24 3AA
Translational Research Hub, Floor 1st, Room 1.06, Maindy Road, Cathays, Cardiff, CF24 4HQ
Queen's Buildings - Central Building, Room Room E3.25, 5 The Parade, Newport Road, Cardiff, CF24 3AA
Translational Research Hub, Floor 1st, Room 1.06, Maindy Road, Cathays, Cardiff, CF24 4HQ
Research themes
Specialisms
- Radio frequency engineering
- Engineering electromagnetics
- Biomedical instrumentation
- Sensor technology
- Microwave
