Imperial College London


Faculty of EngineeringDepartment of Electrical and Electronic Engineering

Visiting Researcher





Electrical EngineeringSouth Kensington Campus





Selected Publications in microwave/optical devices

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[1] J. Li and D. Chu, “Liquid crystal-based enclosed coplanar waveguide phase shifter for 54–66 GHz applications,” Crystals, vol. 9, 12, 650, December 2019. doi: 10.3390/cryst9120650

[2] J. Li, “Challenges and Opportunities for Nematic Liquid Crystals in Radio Frequency and Beyond,” Crystals, vol. 12, 5, 632, April 2022. doi: 10.3390/cryst12050632

[3] A. Yontem, J. Li, and D. Chu, “Imaging through a projection screen using bi-stable switchable diffusive photon sieves,” Opt. Express, vol. 26, pp. 10162–10170, April 2018. doi: 10.1364/OE.26.010162

[4] J. Li, “All-optically Controlled Microwave Analog Phase Shifter with Insertion Losses Balancing,” Engineering Letters, vol. 28, no. 3, pp. 663–667, 2020.

[5] L. Cai, H. Xu, J. Li, and D. Chu, “High figure-of-merit compact phase shifters based on liquid crystal material for 1–10 GHz applications,” Jpn. J. Appl. Phys., vol. 56, 011701, November 2017. doi: 10.7567/JJAP.56.011701

[6] J. Li, “Rethinking Figure-of-Merits of Liquid Crystals Shielded Coplanar Waveguide Phase Shifters at 60 GHz,” J, vol. 4, pp. 444–451, August 2021.

[7] J. Li, “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, no. 4, pp. 14–22, October 2021. doi: 10.33166/AETiC.2021.04.002

[8] J. Li, “Performance Limits of 433 MHz Quarter-wave Monopole Antennas due to Grounding Dimension and Conductivity,” Annals of Emerging Technologies in Computing (AETiC), vol. 6, no. 3, pp. 1–10, July 2022. doi: 10.33166/AETiC.2022.03.001

[9] J. Li, H. Xu, and D. Chu, “Design of liquid crystal based coplanar waveguide tunable phase shifter with no floating electrodes for 60–90 GHz applications,” in 2016 46th European Microwave Conference (EuMC), London, 2016, pp. 1047–1050. doi: 10.1109/EuMC.2016.7824526

[10] J. Li, “Wideband PCB-to-Connectors Impedance Adapters for Liquid Crystal-Based Low-Loss Phase Shifters,” 50th European Microwave Conference (EuMC), Utrecht, Netherlands, 2021, pp. 546–549. doi: 10.23919/EuMC48046.2021.9337967

[11] J. Li, “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), Suzhou, 2020, pp. 1–3. doi: 10.1109/IMWS-AMP49156.2020.9199680

[12] J. Li, “Bias Tees Integrated Liquid Crystals Inverted Microstrip Phase Shifter for Phased Array Feeds,” 21st IEEE International Conference on Electronic Packaging Technology (ICEPT), Guangzhou, 2020, pp. 1–5. doi: 10.1109/ICEPT50128.2020.9202604

[13] J. Li, “Low-loss tunable dielectrics for millimeter-wave phase shifter: from material modelling to device prototyping,” IOP Conference Series: Materials Science and Engineering, vol. 892, 012057, 2020. doi: 10.1088/1757-899x/892/1/012057

[14] J. Li, “Millimetre-wave beam steering with analog-resolution and minimised distortion based on liquid crystals tunable delay lines with enhanced signal-to-noise ratios,” Proc. SPIE, Millimetre Wave and Terahertz Sensors and Technology XIII, vol. 11541, 115410H, September 2020. doi: 10.1117/12.2570001

[15] J. Li, “An Efficient Mixed-signal Dielectric-partitioning Model of Liquid Crystals based Shielded Coplanar Waveguide for Electronically Reconfigurable Delay Lines Design,” Proc. SPIE, Integrated Optics: Design, Devices, Systems and Applications VI, vol. 11775, 1177519, April 2021. doi: 10.1117/12.2593624

[16] L. Cai, H. Xu, J. Li, and D. Chu, “High FoM liquid crystal based microstrip phase shifter for phased array antennas,” in 2016 International Symposium on Antennas and Propagation (ISAP), Okinawa, 2016, pp. 402–403.

[17] J. Li, “Optically Steerable Phased Array Enabling Technology Based on Mesogenic Azobenzene Liquid Crystals for Starlink Towards 6G,” 2020 Asia-Pacific Microwave Conference (APMC 2020), Hong Kong, 2020, pp. 345–347. doi: 10.1109/APMC47863.2020.9331345

[18] J. Li, “Managing 60 GHz Field Peaking of an Liquid Crystal Enclosed Coplanar Waveguide by Core Edge Shaping,” 2020 Asia-Pacific Microwave Conference (APMC 2020),  Hong Kong, 2020, pp. 403–405. doi: 10.1109/APMC47863.2020.9331555

[19] J. Li, “Optically Inspired Cryptography and Cryptanalysis: A Survey and Research Directions,” in Emerging Technologies in Computing, vol. 332, LNICST, Springer, 2020, pp. 98–110. doi: 10.1007/978-3-030-60036-5_7

[20] J. Li, “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), Tirana, Albania, 2020, pp. 21–26. doi: 10.1109/CoNTESA50436.2020.9302865

[21] J. Li, “Figure-of-Merits Mismatch in Liquid Crystals mmWave Phase Shifters,” IEEE 46th International Conference on Infrared, Millimeter, and Terahertz Waves, 2021. pp. 1–2. doi: 10.1109/IRMMW-THz50926.2021.9567615

Selected Publications in Big data-inspired emerging technologies

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[1] JLi, “Vulnerabilities Mapping based on OWASP-SANS: A Survey for Static Application Security Testing (SAST)”, Annals of Emerging Technologies in Computing (AETiC), vol. 4, no. 3, pp. 1–8, July 2020. doi: 10.33166/AETiC.2020.03.001

[2] X. Guo and J. Li*, “A Novel Twitter Sentiment Analysis Model with Baseline Correlation for Financial Market Prediction with Improved Efficiency,” 2019 Sixth IEEE International Conference on Social Networks Analysis, Management and Security (IEEE SNAMS), Granada, Spain, 2019, pp. 472–477. doi: 10.1109/SNAMS.2019.8931720

[3] J. Li and X. Guo, “COVID-19 Contact-tracing Apps: A Survey on the Global Deployment and Challenges,” arXiv preprint arXiv:2005.03599, 2020. (38 citations since 2020)

[4] Y. Wang and J. Li*, “From Reflecting Brownian Motion to Reflected Stochastic Differential Equations: A Systematic Survey and Complementary Study,” arXiv preprint arXiv:2009.03643, 2020.

[5] J. Li and X. Guo, “Global Deployment Mappings and Challenges of Contact-tracing Apps for COVID-19,” SSRN Electronic Journal, 2020. doi: 10.2139/ssrn.3609516 (awarded Top 10% of Authors on SSRN)


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[1] J. Li, “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 (IEEE PEDG), Dubrovnik, 2020. pp. 382–385. doi: 10.1109/PEDG48541.2020.9244313

[2] J. Li, “Hybrid Propulsion Motor Drives Model based on Multi-level Inverters with Optimised Fuel Economy,” IEEE Vehicular Power and Propulsion Conference (IEEE VPPC), Gijón, 2020, pp. 1–5. doi: 10.1109/VPPC49601.2020.9330818