Prof. Jinfeng Li Profile

Prof. Jinfeng Li

Assistant Professor

SPIE Involvement:

Author

Area of Expertise:

Microwave , Liquid crystal , Beam steering , Millimeter wave , Phased array , Phase shifter

Prof. 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 his Ph.D. degree in liquid crystals-based microwave and millimeter-wave electronics engineering from the University of Cambridge. Prof. Li was a recipient of the IET Award, the AP Jarvis Prize, the AETiC Highly Cited Article Award 2023, 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, Emerging Technologist with Barclays UK, Editorial Board member of three Science Citation Index journals, TPC and Session Chair of five 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 the 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. Prof. Li is also a Concert Pianist and Composer with more than 20 piano recitals across China and the UK (2004 - now). Prof. Li was elected National-level Young Talent in 2023. He is teaching two undergraduate modules including (1) States of the Arts in Liquid Crystals Millimeter-wave Technology for 6G; and (2) Frontiers and Progress of Electrical and Computer Engineering.

Proceedings Article | 28 November 2023 Paper

Impact of laser polarization and angle of incidence on phase shifting efficacy of an all-optically addressed liquid crystal delay line at X band

Jinfeng Li

Proceedings Volume 12764, 127640X (2023) https://doi.org/10.1117/12.2685859

KEYWORDS: Liquid crystals, Polarization, Phase shifts, Phase shifting, Microwave radiation, Dielectric polarization, X band, Molecules, Magnetism, Polarized light

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Proceedings Article | 18 April 2021 Poster + Presentation + Paper

An efficient mixed-signal dielectric-partitioning model of liquid crystals based shielded coplanar waveguide for electronically reconfigurable delay lines design

Jinfeng Li

Proceedings Volume 11775, 1177519 (2021) https://doi.org/10.1117/12.2593624

KEYWORDS: Liquid crystals, Waveguides, Systems modeling, Software development, Prototyping, Optoelectronics, Optoelectronic devices, Dielectrics, Transmission electron microscopy, Polarization

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The optoelectronic proliferation of liquid crystals based passive microwave and millimetre-wave reconfigurable technology relies not only upon low-cost micro-fabrication techniques, but also on high-fidelity yet efficient device design and simulation methodologies based on an in-depth understanding of the complex coupling between waveguiding geometries and multi-material systems through multi-physics models. While closed-form analytical solutions are not possible for multi-volume complex geometries, numerically attempting the problem is of research and development interest, in particular for gaining fundamental insights on the coupling between liquid crystals optoelectronic response and millimetre-wave interactions, hence producing guidelines for in-house code development of specific optoelectronic device prototypes without resorting to commercial off the shelf software. To this end and by way of illustration, this work proposes a novel mixed-signal dielectric-partitioning model for local polarisation and tunability analysis into a liquid crystals based shielded coplanar waveguide tunable delay line targeting applications in the 57-66 GHz band. Due to the transverse electromagnetic nature of the fully enclosed coplanar waveguide structure, the traditional two-step approach (liquid crystals’ quasi-electrostatic simulation in microscopic scale progressing to millimetre-wave simulation in macroscopic scale) could be rearranged into one single stage in terms of the molecular directors with respect to the identical electric vector field distributions. The proposed standalone and quasi-analytical model is verified by experimental measurements implemented on a 0–π tunable true-time-delay phase shifter, with a 7.94% improvement in the predicting accuracy of the effective line length required, and a huge reduction in computational costs as compared with the traditional two-step method. The proposed efficient model is envisioned to inform the development of highly efficient in silico tools with high fidelity for liquid crystals based reconfigurable applications beyond displays.

Proceedings Article | 20 September 2020 Presentation + Paper

Millimetre-wave beam steering with analog-resolution and minimised distortion based on liquid crystals tunable delay lines with enhanced signal-to-noise ratios

Jinfeng Li

Proceedings Volume 11541, 115410H (2020) https://doi.org/10.1117/12.2570001

KEYWORDS: Beam steering, Phase shifts, Liquid crystals, Distortion, Signal to noise ratio, Signal attenuation, Dielectrics, Absorption, Phased arrays, Antennas

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Conference Committee Involvement (8)

5th China and International Young Scientist Terahertz Conference

22 March 2024 |

IEEE 15th International Conference on Microwave and Millimeter Wave Technology (ICMMT 2023)

14 May 2023 |

IEEE ISAP (27th International Symposium on Antennas and Propagation)

31 October 2022 |

FICC 2021

29 April 2021 |

SOTICS 2020

18 October 2020 |

Showing 5 of 8 Conference Committees

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