来源：十大网赌网址 浏览：3163 次 时间：2017-10-10
题 目：Performance Metrics of Unidirectional Wideband Circularly-Polarized Antenna Arrays
报告人：Kwok L. CHUNG，Cross-disciplinary Research Professor, Qingdao University of Technology, China, IEEE Senior Member
Owing to the primary advantages of lightweight, low-profile, and low-cost fabrication, printed circuits in conjunction with printed antennas have long been attractive in academic research as well as industrial applications. Over the past decades, printed circularly-polarized (CP) antennas have been used for applications of unidirectional radiation in modern wireless systems, satellite navigation system, space communications, and radar tracking system, to name only a few. CP antennas offer many advantages over conventional (linearly polarized) antennas, namely, the orientations between mobile stations and base-stations are not strictly required, the lower polarization mismatching loss, and the alleviation of multipath fading, etc. Nevertheless, the unidirectional CP antennas often suffer from narrow overlapped (operating) bandwidth and difficulty achieving high beam efficiency due to the high sidelobe levels, in the order of -10 dB.
This presentation will be delivered in three sections. In the first section, the author will review the common performance metrics and a number of unnoticed yet important metrics. In the second part, the author will showcase a number of interesting artistic antenna designs with unidirectional radiation. In the third part, the author will present the metasurfaced patch antennas and associated CP arrays with feed networks. In addition to the usual performance enhancement of unidirectional CP arrays, sidelobe level suppressions and gain bandwidth enhancement will be presented and discussed via a few exemplary designs.
Kwok L. Chung received his B.E. degree with first-class honors and Ph.D. degree in electrical engineering from the University of Technology Sydney (UTS), Australia in 1999 and 2005, respectively. He worked as an engineer, lecturer and professor in Hong Kong, Australia, as well as in China. He has been a cross-disciplinary research professor in the emerging discipline of Civionics at the Qingdao University of Technology (QUT), China, since December 2015. His current research interests include the development of smart sensors for civil engineering applications, structural health monitoring (SHM), characterization of cementitious composites using near-field technique, microwave antennas, applications of metamaterial and metasurface, and wireless power transmission. Prof. Chung is a core member of the Taishan Scholar Priority Discipline Talent Group at QUT and is a member for the International Steering Committee of the IEEE International Workshop on Electromagnetics (iWEM). He has authored and coauthored about 100 publications (SCI & EI) in various areas of Electronic and Civil Engineering. He is also an associate editor of the IEEE Access and acts as a reviewer for numerous IEEE, IET and other International journals.
Prof. Chung was the Vice-chair and Chairman of the IEEE AP/MTT Hong Kong Joint Chapter in 2010 and 2011, respectively. He has been the founder and the chairman of the IEEE Qingdao AP/MTT/COM chapter since 2016.