Details of the Talk
Prof Kwai-Man Luk,
Director of State Key Laboratory of Millimeter Waves
Head & Chair Professor
Department of Electronic Engineering
City University of Hong Kong
Professor Luk received his BSc(Eng) and PhD degrees in electrical engineering from HKU in 1981 and 1985 respectively. He is currently Head of Electronic Engineering Department and Director of State Key Laboratory of Millimeter Waves at the City University of Hong Kong. His research interest is on wireless communications antennas. He is the author of three books, nine research book chapters, over 250 journal papers and 180 conference papers. He was awarded two US patents and over 10 PRC patents on the designs of various printed antennas.
Professor Luk is a Fellow of IEEE, IET, CIE, FEA and HKIE. He received the Japan Microwave Prize in 1994, the CityU Applied Research Excellence Award in 2001, the Croucher Senior Research Fellowship in 2003, and the Best Paper Award at the International Symposium on Antennas and Propagation in 2008.
June 15, 2009 (Monday)
5:00 pm – 6:15 pm
Theatre B, Chow Yei Ching Building, HKU
With the proliferation of mobile phones, wireless communication technologies have penetrated many aspects of our daily lives. In all wireless systems, the antenna plays a vital role in determining the overall system performance. The numerous new applications in the market have spurred strong demands for new high-performance antennas. In particular, design of esthetically pleasing wideband antennas with different radiation patterns, beamwidths and polarizations is challenging and exciting.
Directed dipole antennas are simple in structure but poor in radiation pattern control. Patch antennas are low in profile but narrow in bandwidth. In this lecture, the design and performance of a new class of directional antennas, designated as the magneto-electric dipoles, will be presented. These antennas were developed based on the complementary antenna concept. The basic structure consists of an electric dipole and a shorted patch antenna. These novel antenna elements have many attractive features, including wide impedance bandwidth, low cross polarization, low backlobe radiation, nearly identical E- and H-plane patterns, stable radiation pattern, and constant antenna gain across the entire frequency band. With simple feed structures, they can also be enhanced to become diversity antennas with pattern and polarization diversities.
*All are welcome.*
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