Abstract

As FCC in USA authorized the unlicensed use of ultra-wideband (UWB) in 2002 for short-range communication, research activities have been tremendously aroused on exploration of various UWB microwave components, antennas and subsystems. This talk mainly covers the proposal and development of a novel class of wideband filters with the FCC-defined UWB passband (3.1~10.6GHz or fractional bandwidth of 110%). The concept of multiple-mode resonator is at first presented and its multiple resonant modes are then utilized with frequency dispersion of parallelcoupled lines to realize the required UWB passband. Afterwards, various types of UWB bandpass filters are designed and implemented on the microstrip line (MSL), coplanar waveguide (CPW) and hybrid MSL/CPW structure. Simulated and measured results are finally provided to demonstrate the actual UWB passband performances.

About the speaker

Dr. Lei Zhu received the B. Eng. and M. Eng. degrees in radio engineering from the Nanjing Institute of Technology (now: Southeast University), China, in 1985 and 1988, respectively and the Ph.D. Eng. degree in electronic engineering from the University of Electro-Communications, Japan, in 1993. From 1993 to 1996, he was a Research Engineer with the Matsushita-Kotobuki Electronics Industries, Japan. From 1996 to 2000, he was a Research Fellow with the Ecole Polytechnique, University of Montreal, Canada. Since July 2000, he has been an Associate Professor with the School of Electrical & Electronic Engineering, Nanyang Technological University, Singapore. His research interests include planar RF & microwave circuits, periodic structures, planar antennas, numerical EM modeling & de-embedding techniques. So far, he has published more than 135 papers in journals/conferences (including 40 in IEEE journals) and his papers have been cited more than 160 times by others (source: SCI). He was the recipient of the Asia-Pacific Microwave Prize Award (1997).