IEEE APS Nagoya Chapter


特別講演会 (Dr. Zhining Chen)

日時: 2009年5月11日(月) 15:00-16:30
場所: 名古屋工業大学 大学会館3F 大学会館講義室
講師: Dr. Zhi Ning Chen (シンガポール・インフォコムリサーチ研究所,IEEE Fellow,IEEE Distinguished Lecturer)
演題: 「超広帯域アンテナ(UWBアンテナ)の小形化」
  高品質映像配信などのブロードバンド通信用に超広帯域通信(Ultra Wide Band; UWB)方式が提案されています。この通信に用いられるアンテナには超広帯域性能が必要とされるとともに,様々な通信機への搭載を考慮し,小形化が望まれています。ところが一般的にアンテナの帯域は,アンテナのQ値すなわちアンテナの電気的サイズに依存し,広帯域性と小形化を同時に実現することは難しいという問題があります。これらを背景に,本講演では,広帯域アンテナの小形化設計の勘所についてご講義頂きます。また,UWBアンテナの応用と市場に基づいた,最近の開発動向についてご紹介頂きます。

Miniaturization of Ultra-wideband Antenna

This talk briefly introduces design challenges of ultra-wideband (UWB) antennas. An outlined of special design considerations are presented from a systems point of view, followed by some state-of-the-art solutions. Then, the miniaturization technology of UWB antennas is addressed. The planar designs are highlighted due to their unique merits and wide adoption in applications. First, the ground plane dependence of the antenna performance in small antenna design is addressed. Using a newly developed technique, the dependence of small antenna performance on system ground plane is alleviated. A design example is used to elaborate the mechanism of the method. Based on this concept, the antenna with further reduced size is designed to fit the size of wireless USB dongle. Furthermore, an innovative compact diversity UWB antenna shows the advantage of ground-independence small antenna in diversity applications. Last, a UWB antenna integrated with bandpass filter is proposed to reduce the overall size of devices by using the concept of co-design. In the end of the talk, the trend of UWB antenna R&D is offered according to application and market demands.
Dr Zhi Ning Chen received his BEng, MEng, PhD, and DoE degrees all in Electrical Engineering from Institute of Communications Engineering, China and University of Tsukuba, Japan, respectively. During 1988-1995, he worked as Teaching Assistant, Lecturer, Postdoctoral Fellow and later Associate Professor at Institute of Communications Engineering and Southeast University, China. During 1995-1997, he joined in City University of Hong Kong, China as Research Assistant, later Research Fellow. In 1997, he conducted his research at University of Tsukuba, Japan as JSPS Fellow. In 2001 and 2004, he visited University of Tsukuba under JSPS Fellowship Program (senior level). In 2004, he worked at IBM T. J. Watson Research Center, USA as Academic Visitor. Since 1999, he has worked with Institute for Infocomm Research as Member of Technical Staff (MTS) and later Principal MTS. He is currently appointed as Principal Scientist and Head for RF & Optical Department as well as PIs for multiple academic and industry projects. He is concurrently holding the adjunct/guest professorships at Southeast University, Nanjing University, Shanghai Jiao Tong University, and National University of Singapore. He has also been Technical Advisor of Compex Systems (listed) since 2006.

Dr Chen has organized many international technical events as general chairs, technical program committee chairs. He founded IEEE International Workshop on Antenna Technology (iWAT) in 2005, which has become one of the most important international antenna events. He has delivered invited talks, keynote speeches and short courses at many international events. He is serving several international journals as Editor, Associate Editors, Guest Editors, and Reviewers. Dr Chen has published more than 230 journal and conference papers. He has authored and edited the books entitled "Broadband Planar Antennas", "UWB Wireless Communication" and "Antennas for Portable Devices" all published by John Wiley & Sons as well as "Antennas for Base-stations in Wireless Communications" (to be published in 2009). He also contributed to the books of "UWB Antennas and Propagation for Communications, Radar, and Imaging" published by John Wiley & Sons and "Antenna Engineering Handbook" published by McGraw Hill. He is the co-/inventor of more than 20 granted and filed patents. Several of his antenna designs have been licensed to industry for production. His current research interest includes applied electromagnetics, antennas, and bio-electromagnetics.

Dr. Chen is a Fellow of the IEEE for his contribution to small and broadband antennas for wireless applicationsand IEEE Antennas and Propagation Society Distinguished Lecturer. (more information can be found at