题目：Dual-frequency Antennas with Large Frequency Ratios
Two dual-fed dual-frequency antennas with large frequency ratios are presented in this talk. The first dual-frequency antenna consists of a pair of folded parallel plates. It integrates the microwave parallel-plate waveguide resonator antenna with the millimeter-wave Fabry-Perot resonator antenna (FPRA), with their resonant frequencies being independent of each other. Because of the folded structure, the profile of the proposed antenna is lower than that of the conventional parallel plate waveguide resonator antenna. For the second dual-frequency antenna design, a microwave hollow dielectric resonator antenna (DRA) is integrated with a high-gain millimeter-wave dielectric FPRA. To obtain the dual-frequency operation, the dielectric and air regions of the hollow DRA are designed to satisfy the resonance condition of the FPRA. The ideas have been demonstrated by designing two dual-frequency antennas that cover the 2.4-GHz and 24-GHz ISM bands designed. The two antennas were fabricated and measured, and reasonable agreement between the measured and simulated results is found.
Kwok Wa (Ben) Leung was born in Hong Kong. He received the B.Sc. degree in electronics and the Ph.D. degree in electronics engineering from the Chinese University of Hong Kong, Hong Kong, in 1990 and 1993, respectively. In 1994, he joined the Department of Electronic Engineering, City University of Hong Kong (CityU) and is currently a Chair Professor and the Associate Head. From January to June, 2006, he was a Visiting Professor at the Department of Electrical Engineering, The Pennsylvania State University, State College, PA, USA. His research interests include antenna designs and EM theory. Prof. Leung received the International Union of Radio Science (USRI) Young Scientists Awards in Japan and Russia, in 1993 and 1995, respectively. He received the CityU Research Excellence Award 2013 and Departmental Outstanding Teacher Awards in 2005, 2010, and 2011. He also received the highly prestigious First Class Award (Natural Science) in the 2016 Higher Education Outstanding Scientific Research Output Awards (Science and Technology) of the Ministry of Education, China. His students received the 2015 iWEM Student Best Paper Award, 2015 IEEE AP-S Eugene F. Knott Memorial Pre-Doctoral Research Award, and 2014 IEEE MTT-S Undergraduate/Pre-graduate Scholarship. He was Chair of the IEEE AP/MTT Hong Kong Joint Chapter for 2006 and 2007. He was the Technical Program Chair, 2008 Asia-Pacific Microwave Conference, Hong Kong, and the Technical Program Co-Chair, 2006 IEEE TENCON, Hong Kong. He was a Guest Editor of IET Microwaves, Antennas and Propagation. He served as Associate Editor for the IEEE Antennas and Wireless Propagation Letters. He was also an Associate Editor for the IEEE Transactions on Antennas and Propagation and received Transactions Commendation Certificates twice in 2009 and 2010 for his exceptional performance. He was the Editor-in-Chief of the Transactions from 2013 to 2016, being the first Chinese and also the first appointed from Asia since the journal was founded in 1952. He was a Distinguished Lecturer of the IEEE Antennas and Propagation Society and a member of the AP-S Distinguished Lecturer Program Committee. He is a Fellow of IEEE.