Seminar on by 8zpO116a


									Department of Electronic Engineering                                                                                    IEEE AP/MTT HK
                                                                                                                          Joint Chapter
                                                           Seminar on
                       Some recent collaborative researches on
                dielectric resonator antennas between the University
                 of Mississippi and the City University of Hong Kong
             Dr Ricky Chair                        Prof Kai Fong LEE                               Mr Steven S. L. Yang
            Jaybeam Wireless                Dean, School of Engineering, The                      Dept of Electronic Engg
                  USA                                                                              City University of HK
                                             University of Mississippi, USA

This talk will describe several research topics on dielectric resonator antennas (DRAs) performed by Ricky Chair and Steven Yang at the
University of Mississippi (UM) under the supervision of Dr. Ahmed Kishk and Dr. K. F. Lee. Ricky Chair obtained his Ph.D. degree
from City University of Hong Kong and was a research associate at UM for 2 ¾ years. Steven Yang, a current Ph.D. student at CityU,
spent the summer of 2005 at UM.

The talk will begin with a performance comparison between DRAs and microstrip patch antennas at X-band. Two broadbanding
techniques, one based on an embedded structure and another on a staircase structure, are then described. The impedance bandwidths
achieved by the two structures are 30% and 50% respectively. The third topic concerns the designs of circularly polarized DRAs. Single
element elliptical and staircase CP DRAs obtained 4% and 10% AR bandwidth respectively. Sequentially rotated four element subarrays
of such elements achieve 26% and 35% AR bandwidth respectively.

Prof Kai-Fong Lee received his B.Sc. and M.Sc. degrees from Queen’s University, Canada and his Ph.D. degree from Cornell University,
all in electrical engineering. In his career, he has held research, faculty, and academic administrative positions in the U.S. and Hong Kong.
He was the founding Head of the Department of Electronic Engineering at the City University of Hong Kong. He served as Chairman of
Electrical Engineering at The University of Toledo, Ohio and Chairman and LaPierre Professor of Electrical Engineering at the University
of Missouri-Columbia. Since January 2001, he has been Dean of Engineering and Professor of Electriceal Engineering at the University
of Mississippi. Professor Lee’s publications include a textbook, ten invited book chapters on microstrip antennas, 180 Journal Articles
and 137 conference papers. He is a Fellow of IEEE and a Fellow of IEE.
Dr Ricky Chair received his B. Eng. and PhD degrees in electrical engineering from the City University of Hong Kong in 1998 and 2002
respectively. He was a research fellow at the University of Mississippi from July 2003 to March 2006. He has co-authored one book
chapter on microstrip antennas and published over 50 technical papers on microstrip and dielectric resonator antennas in international
journals and conferences. He is currently a Senior RF Engineer at Jaybeam Wireless.

Mr Steven Yang received his BEngECE degree from the City University of Hong Kong in 2003. He is working toward the Doctor of
Philosophy degree at the same university. In summer 2005, he visited the Department of Electrical Engineering, University of Mississippi,
as a Visiting Research Scholar. His research interests include the microstrip patch antennas design, reconfigurable antennas design, and
microwave circuits design.

                                                      Date : 5 December 2006 (Tuesday)
                                                      Time : 5:00pm – 6:00pm
                                                      Venue : Room G6302, 6/F, Academic Building,
                                                              City University of Hong Kong

                                                   *** ALL ARE WELCOME ***

Enquiry: Prof K M Luk, Department of Electronic Engineering, CityU
         Tel: 2788 7352    Fax: 2788 7293      Email:

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