Technology market forecasts high-frequency products will boost up rapidly in the coming decades not only the popular microwave electronics but also that of unreleased millimeter-wave and terahertz inventions. Scientists put hard efforts to demonstrate both feasibility and capability of the new allocated frequency spectrum by ITU from 110 to 450 GHz that can be commercialization through the introduction of emerging applications of wireless systems such as 6G communications, terahertz imaging, millimeter-wave detection and sensing, low-orbit space communications, intelligent ultra-fast wireless, green energy network, etc. In this talk, the speaker is going to introduce recent high-frequency electronic developments by other world-leading antenna research groups and share state-of-the-art antenna technologies invented at the State Key Laboratory of Terahertz and Millimeter Waves, City University of Hong Kong. Breaking through the bottleneck of PIN diode at high-frequency devices, the speaker will demonstrate some examples of using functional materials to design millimeter-wave and terahertz reconfigurable, tunable, and switchable devices including antennas, metasurfaces, polarizers, modulators, and filters.

Biography:

Hang Wong received a Ph.D. degree from City University of Hong Kong in 2006. He was an acting assistant professor in the Department of Electrical Engineering, Stanford University, in 2011. He joined the Department of Electrical Engineering in 2012 and is currently an Associate Professor and the Deputy Director of the State Key Laboratory of Terahertz and Millimeter Waves. He had several visiting professorships at University of Waterloo; Canada, University of College London, UK; and University of Limoges, France in 2013, 2014, and 2015 respectively. His research interests include designs of wideband antennas, reconfigurable antennas, millimeter-wave antennas, terahertz antennas, functional-material antennas and related applications. He has published over 250 papers, 22 patents, and 2 book chapters, with Google citations of 6400+ and an H-index of 46. He is the chair of the IEEE Antennas and Propagation /Microwave Theory and Techniques (MTT) Chapter of Hong Kong, the IEEE APS Region-10 Representative, and the associate editor of IEEE Transactions on Antennas and Propagation. Dr. Wong was the general co-chair of 2020 Asia Pacific Microwave Conference; and the general chair of 2021 Cross Strait Radio Science and Wireless Technology Conference. Dr. Wong’s contribution has been highly recognized by numerous technical awards and best paper awards at the international conferences at the countries of USA, UK, France, Korea, Japan, and China. He pioneered an L-probe dual-polarization antenna technology in 2004, invented a magneto-electric antenna in 2006, and developed the first generation of Beidu’s handheld antenna in 2008. Parts of his antenna inventions were adopted by industry leaders to Beidu nagaviation system, Zigbee wireless sensing network, and 5G MIMO base-station antennas. He was awarded the top 2% most-cited scientist by Stanford University in 2021 and 2022.

The emerging wireless communication and radar systems at millimeter-wave (mm-Wave) frequencies de-mand a power-efficient wideband local oscillator (LO) with low phase noise. As the frequency increases, the quality factors of the on-chip varactor and switched capacitor sharply drop, resulting in a severe tradeoff among phase-noise, frequency tuning range (FTR), and power consumption for fundamental mm-Wave oscillators.

This talk will start with the various mode-switching techniques that increase the oscillator’s FTR without impairing its phase noise performance. With the proposed inductive mode-switching technique, the 42.9-to-50.6 GHz VCO prototype demonstrates a phase noise of −103.6 dBc/Hz @ 1MHz offset at 46GHz with a power consumption of 21mW. This talk will also introduce the harmonic extraction techniques that provide another direction for the mm-Wave frequency generation. By extracting the third-harmonic tone, the fundamental oscillator can operate at a much lower frequency, relieving the phase noise, power, and FTR tradeoffs. With the proposed current-mode implicit frequency tripling technique, the 54.9-to-63.5GHz LO generator demonstrates a phase noise of −100.7 dBc/Hz @ 1MHz offset at 60GHz with a power consumption of 9mW.

Biography:

Jun Yin received the B.Sc. and the M.Sc. degrees in Microelectronics from Peking University in 2004 and 2007, respectively, and the Ph.D. degree in Electronic and Computer Engineering (ECE) from Hong Kong University of Science and Technology in 2013. He is currently with the State-Key Laboratory of Analog and Mixed-Signal VLSI at the University of Macau as an Associate Professor. Dr. Yin is serving as an As-sociate Editor for IEEE Transactions on Circuit and Systems I (TCAS-I) and a TPC member for Interna-tional Solid-State Circuits Conference (ISSCC), Asian Solid-State Circuit Conference (A-SSCC), and Eu-ropean Solid-State Circuit Conference (ESSCIRC). His research interests include RF-to-mm-Wave frequen-cy generation circuits and low-power CMOS wireless transceivers for IoT applications.