Imperial College London


Faculty of EngineeringDepartment of Electrical and Electronic Engineering

Visiting Researcher





Electrical EngineeringSouth Kensington Campus





Dr. Jinfeng Li is a microwave engineer, a specialist in novel reconfigurable RF devices, as well as an authority on liquid crystals-based microwave and millimetre-wave technology. He received the B.Eng. degree (1st class) in electrical and electronics engineering from the University of Birmingham and Huazhong University of Science & Technology, in 2013, the MPhil degree in nuclear energy from the University of Cambridge, in 2014, and the Ph.D. degree in liquid crystals based microwave and millimeter-wave electronics engineering from University of Cambridge, in 2019.

From 2019, he joined the University of Southampton as a research fellow, and Imperial College London as a visiting research fellow. His research experiences include (1) microwave and millimetre-wave beam steering and tunable devices based on liquid crystals for 5G, inter-satellite communications, and radio astronomical instrumentation; (2) wireless surface acoustic wave sensors and phased array antenna for monitoring the structural integrity of LNG tanks; (3) light water reactor thermal hydraulics facility and instrumentation development in North Wales; (4) optical fiber based multi-phase flow characterisation; (5) computational modelling of nuclear reactor core using Monte Carlo and deterministic methods for nuclear energy policy decision-making; (6) motor drives of multilevel multicell inverters for fuel economy and sustainable cities; (7) application security and sentiment analysis of big data for stock market forecasting; (8) contact tracing and health informatics for COVID-19 (cited by PNAS and Lancet Public Health).

Dr Li was a recipient of the IET Award, the AP Jarvis Prize, and two Best Paper Awards at the IEEE and IOP conferences, respectively. He was a Cambridge Trust Scholar, Speaker at the 50th & 46th European Microwave Conferences (EuMC), Emerging Technologist with Barclays UK, Editorial Board for 4 Science Citation Index journals, TPC and Session Chair of 5 IEEE conferences, including IEEE ISAP (27th International Symposium on Antennas and Propagation), and IEEE 15th International Conference on Microwave and Millimeter Wave Technology (ICMMT 2023). He was elected Senior Member of China Institute of Communications (CIC), Top 1% reviewer on Publons (Web of Science), Newton Prize (£1m fund) reviewer for the UK National Commission for UNESCO, and grants reviewer for Health and Social Care Delivery Research (HSDR) fund from National Institute for Health Research (NIHR), UK.

Selected Publications

Journal Articles

Li J, 2023, From liquid crystal on silicon and liquid crystal reflectarray to reconfigurable intelligent surfaces for post-5G networks, Applied Sciences, Vol:13, ISSN:2076-3417, Pages:1-9

Li J, 2023, Will ‘liquid-crystal-based floating-electrode-free coplanar waveguide phase shifter with an additional liquid-crystal layer for 28-GHz applications’ work?, Engineering Letters, Vol:31, ISSN:1816-093X, Pages:820-824

Li J, 2023, Taking flow characterization to new heights by fiber Bragg gratings array, Energies, Vol:16, ISSN:1996-1073, Pages:1-4

Li J, 2023, Rethinking liquid crystal tunable phase shifter design with inverted microstrip lines at 1–67 GHz by dissipative loss analysis, Electronics (basel), Vol:12, ISSN:2079-9292, Pages:1-18

Li J, 2022, Performance limits of 433 MHz quarter-wave monopole antennas due to grounding dimension and conductivity, Annals of Emerging Technologies in Computing, Vol:6, ISSN:2516-0281, Pages:1-10

Li J, 2022, Challenges and opportunities for nematic liquid crystals in radio frequency and beyond, Crystals, Vol:12, ISSN:2073-4352, Pages:1-2

Li J, 2021, Towards 76-81 GHz scalable phase shifting by folded dual-strip shielded coplanar waveguide with liquid crystals, Annals of Emerging Technologies in Computing, Vol:5, ISSN:2516-0281, Pages:14-22

Li J, 2021, Rethinking figure-of-merits of liquid crystals shielded coplanar waveguide phase shifters at 60 GHz, J, Vol:4, ISSN:2571-8800, Pages:444-451

Li J, 2020, All-optically Controlled Microwave Analog Phase Shifter with Insertion Losses Balancing, Engineering Letters, Vol:28, ISSN:1816-093X, Pages:663-667

Li J, 2020, Vulnerabilities Mapping based on OWASP-SANS: A Survey for Static Application Security Testing (SAST), Annals of Emerging Technologies in Computing, Vol:4, ISSN:2516-0281, Pages:1-8

Li J, Chu D, 2019, Liquid Crystal-Based Enclosed Coplanar Waveguide Phase Shifter for 54-66 GHz Applications, Crystals, Vol:9, ISSN:2073-4352

Yontem AO, Li J, Chu D, 2018, Imaging through a projection screen using bi-stable switchable diffusive photon sieves, Optics Express, Vol:26, ISSN:1094-4087, Pages:10162-10170

Cai L, Xu H, Li J, et al., 2017, High figure-of-merit compact phase shifters based on liquid crystal material for 1-10 GHz applications, Japanese Journal of Applied Physics, Vol:56, ISSN:0021-4922


Li J, 2020, Optically Inspired Cryptography and Cryptanalysis: A Survey and Research Directions, Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, Springer International Publishing, Pages:98-110, ISBN:9783030600358


Li J, 2023, Dissipative Analysis of Liquid Crystal-loaded Passive Reconfigurable Transmission Line Components with Filled Vias at 60 GHz, 2023 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO), IEEE

Li J, Machine Learning and Digital Twinning Enabled Liquid Crystals mm-Wave Reconfigurable Devices Design and Systems Operation, 2022 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP)

Li J, 2022, 60 GHz 0-360˚ Passive Analog Delay Line in Liquid Crystal Technology based on a Novel Conductor-backed Fully-enclosed Coplanar Waveguide, 2022 IEEE 72nd Electronic Components and Technology Conference (ECTC), IEEE

Li J, 2022, 79 GHz Meandering Enclosed-coplanar Variable Delay Lines in Liquid Crystals Encapsulated within Independent and Shared Cavities, 27th International Symposium on Antennas and Propagation (ISAP), IEEE, Pages:457-458, ISSN:1522-3965

Li J, 2022, Novel Partially-Shielded Coplanar Waveguide with Metasurfaces for Liquid Crystals Tunable Delay Lines beyond 67 GHz, ISSN:2474-1760

Li J, An Efficient Mixed-signal Dielectric-partitioning Model of Liquid Crystals based Shielded Coplanar Waveguide for Electronically Reconfigurable Delay Lines Design, Integrated Optics: Design, Devices, Systems and Applications VI, Society of Photo-optical Instrumentation Engineers, ISSN:0277-786X

Li J, Hybrid Propulsion Motor Drives Model based on Multi-level Inverters with Optimised Fuel Economy, IEEE Vehicular Power and Propulsion Conference (IEEE VPPC 2020)

Li J, Wideband PCB-to-Connectors Impedance Adapters for Liquid Crystal-based Low-loss Phase Shifters, 50th European Microwave Conference (EUMC)

Li J, Optically Steerable Phased Array Enabling Technology Based on Mesogenic Azobenzene Liquid Crystals for Starlink Towards 6G, 2020 IEEE Asia-Pacific Microwave Conference (APMC)

Li J, Managing 60 GHz Field Peaking of an Liquid Crystal Enclosed Coplanar Waveguide by Core Edge Shaping, 2020 IEEE Asia-Pacific Microwave Conference (APMC)

Li J, 2021, Figure-of-Merits Mismatch in Liquid Crystals mmWave Phase Shifters, 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz), IEEE, ISSN:2162-2027

Li J, Performance Limits of Liquid Crystals Coplanar Phase Shifters beyond 60 GHz due to Fabrication, IEEE International Conference on Computing, Networking, Telecommunications & Engineering Sciences Applications 2020 (IEEE CoNTESA)

Li J, 2020, Design and control optimisation of a novel bypass-embedded multilevel multicell inverter for hybrid electric vehicle drives, IEEE 11th International Symposium on Power Electronics for Distributed Generation Systems (PEDG 2020), IEEE

Li J, 2020, Bias tees integrated liquid crystals inverted microstrip phase shifter for phased array feeds, 21st International Conference on Electronic Packaging Technology (ICEPT), IEEE

Li J, 2020, Millimetre-wave beam steering with analog-resolution and minimised distortion based on liquid crystals tunable delay lines with enhanced signal-to-noise ratios, SPIE Security + Defence: Millimetre Wave and Terahertz Sensors and Technology XIII, Society of Photo-optical Instrumentation Engineers, ISSN:0277-786X

Li J, 2020, 60 GHz optimised nickel-free gold-plated enclosed coplanar waveguide liquid crystal phase shifter, IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IEEE MTT-S IMWS-AMP), IEEE

Li J, 2020, Low-loss tunable dielectrics for millimeter-wave phase shifter: from material modelling to device prototyping, IOP Publishing, Pages:012057-012057, ISSN:1757-8981

Guo X, Li J, 2019, A novel Twitter sentiment analysis model with baseline correlation for financial market prediction with improved efficiency, 2019 Sixth International Conference on Social Networks Analysis, Management and Security (SNAMS), IEEE

Cai L, Xu H, Li J, et al., 2016, High FoM Liquid Crystal based Microstrip Phase Shifter for Phased Array Antennas, 21st International Symposium on Antennas and Propagation (ISAP), IEEE, Pages:402-403

Li JF, Xu H, Chu DP, 2016, Design of Liquid Crystal Based Coplanar Waveguide Tunable Phase Shifter with no Floating Electrodes for 60-90 GHz Applications, 46th European Microwave Conference (EuMC), IEEE, Pages:1047-1050, ISSN:2325-0305

Thesis Dissertations

Li J, 2019, Structure and Optimisation of Liquid Crystal based Phase Shifter for Millimetre-wave Applications

More Publications