学术报告会 题目: Reconfigurable antenna designs for body-centric wireless communications 报告人：黄衡 博士 (Dr. Hang Wong)

2016年5月11日（周三）14:30-15:15

最热门的网赌网址大全(东校区)十大网赌网址信誉排行榜207讲学厅

题目: Reconfigurable antenna designs for body-centric wireless communications

报告人： 黄衡 博士 (Dr. Hang Wong)

       香港城市大学电子工程系

 IEEE Antennas and Wireless Propagation Letters 副主编

主持人： 郑少勇 副教授

Abstract: 

This talk will introduce a new antenna technology for enhancing the signals quality in body-centric wireless systems (BWCS). The content of this talk includes a polarization-reconfigurable antenna with four switchable linear polarizations. The proposed antenna with switchable 0⁰, +45⁰, 90⁰ and -45⁰ linear polarizations is able to overcome the polarization mismatching and multi-path distortion in complex wireless channels as in BWCS. To realize this reconfigurable feature, we assembled four dipoles together with 45⁰ rotated sequential arrangements. These dipoles are excited by the same feeding source provided by a ground tapered Balun. A metallic reflector is placed below the dipoles to generate a broadside radiation. By introducing eight PIN diodes as RF switches between the excitation source and the four dipoles, we can control a specific dipole to operate. As the results, 0⁰, +45⁰, 90⁰ and -45⁰linear polarizations can be switched correspondingly to different operating dipoles. Experimental results agree with the simulation and show that the proposed antenna well works in all polarization modes with desirable electrical characteristics. The antenna has a wide impedance bandwidth of 34% from 2.2 to 3.1 GHz (for the reflection coefficient £ -10 dB) and exhibits a stable cardioid-shaped radiation pattern across the operating bandwidth with a peak gain of 5.2 dBi. To validate the effectiveness of the multi-dipole antenna for biomedical applications, we also designed a meandered PIFA as the implantable antenna. Finally, the communication link measurement shows that our proposed antenna is able to minimize the polarization mismatching and maintains the optimal communication link thanks to its polarization reconfigurability.

Biography:

Dr. Wong received the B.Eng., M.Phil., and Ph.D. degrees in electronic engineering from City University of Hong Kong in 1999, 2002 and 2006, respectively. He joined the State Key Laboratory (SKL) of Millimeter Waves, in Hong Kong SAR, China, in 2008 as a senior engineer. He was an acting assistant professor in the Department of Electrical Engineering, Stanford University, in 2011. He joined the Department of Electronic Engineering as an assistant professor at City University of Hong Kong in 2012. He had several visiting professorships at University of Waterloo; Canada, University of College London, UK; and University of Limoges, France in the years of 2013, 2014, and 2015 respectively. His research interests include design of broadband antennas, small antennas, millimeter wave antennas and related applications. He has published more than 90 international journals and conference papers. He was awarded 17 US and China patents. He was the co-author of two antenna research book chapters. He was the chair of the IEEE Hong Kong Section of the Antennas and Propagation (AP)/Microwave Theory and Techniques (MTT) Chapter from 2011 to 2014. He is recently appointed as the IEEE APS Region-10 Representative. He is an associate editor of IEEE AWPL, Antennas and Wireless Propagation Letters, since 2012.  Dr. Wong received 2011 State Technology Invention Award (国家科学技术发明奖) presented by the Ministry of Science and Technology of the P.R. China with Professors Kwai-Man Luk, Chi-Hou Chan, and Quan Xue for their contributions of wideband patch antenna developments and applications.