Analysis of an Antenna Loaded with a Bi-anisotropic Body of Arbitrary Shape

Edward Kai-Ning Yung
Hong Kong SAR, China

Friday, May 7, 2010 at 10:00am
The Rice Room - 6764 Boelter Hall

Abstract

Talk I, 10:00 to 11:00 am: Analysis of an Antenna Loaded with a Bi-anisotropic Body of Arbitrary Shape

The talk will begin with a brief introduction of bi-anisotropy, historical discoveries, and recent developments. It is followed by a review on electromagnetic bi-anisotropy, types of bi-anisotropic media, characteristics of wave propagations in a bi-anisotropic medium, and attempts in making composite bi-anisotropic materials. Endeavors to improve the properties of an antenna by loading it with a bi-anisotropic body of arbitrary shape will be presented. Conventional methods used in analyzing wave scattered from a bi-anisotropic body of a given shape will be revisited, and difficulties encountered in using these methods in solving a loaded antenna stressed. To this end, a new method is developed for analyzing the proposed antenna by reformulating the Maxwell's equations. It is a one-size-fits-all method for analyzing an antenna loaded with any material, from the simple lossless dielectric cube to the lossy bi-anisotropic one of arbitrary shape. It is easy-to-use because there is no need to derive the configuration-dependent dyadic Green's functions. Moreover, an efficient method has been developed to solve the integro-differential equations. By choosing a dipole radiating in the vicinity of a lossless dielectric sphere as a reference, validity of the new method is demonstrated because results obtained by other analytical methods and experimental data are available for comparison. It will be shown that the loaded antenna exhibits all characteristics as expected, theoretically. The talk will be concluded by flashing ideas in mass producing bi-anisotropic materials cost-effectively.

The talk will begin with a brief review on various RFID systems available on market, including passive systems at 13.56MHz and 900MHz, active ones at 433 MHz, 900MHz, and 2450MHz, semi-active RFID and hybrid systems. Their pros and cons for uses in hospitals are compared and contrasted. Attention is then focused on techniques for minimizing electromagnetic interferences, compatibility with the existing practices, patients' comfort and convenience, reliability, and robustness. New features are introduced for reducing human and non-human errors, improving efficiency, and providing better value-added services.

Biography
Edward Kai-Ning YUNG was born in Hong Kong. He went to schools in Hong Kong and received his tertiary education in the United States. After getting three degrees from the University of Mississippi, Dr. Yung worked briefly in the University of Illinois at Urbana-Champaign before returning to Hong Kong in 1978 and began his teaching career. In three decades, he has played a key role in the six-fold expansion of university education and witnessed the transformation of Hong Kong from an entrepot into a major metropolitan center. He joined the newly established City Polytechnic of Hong Kong in 1984 for setting up a new department. He headed the Department of Electronic Engineering again in 1995. In a short span of six years, he has converted the department into a strong team of 60 professors, including many world-renowned scholars. He is especially proud that his research team in applied electromagnetics has been recognized by his peers as one of the best in the Asia Pacific region. For his contributions, he was installed one of the first four professors in 1988. After the polytechnic was granted a university status, Prof. Yung was awarded one of the first two personal chairs in 1994 for academic leadership and excellence in research. Despite his heavy administrative load, Edward is always active in research in areas of computational electromagnetics, antenna design, and microwave devices. He founded the Wireless Communications Research Center in 1994 and resumed its directorship after steeping down in 2002. Over the years, he has built a strong RFID team in the design of components, devices, software, and system integration. On the more theoretical side, he has done pioneering work in studies of ferrite and bi-anisotropic materials such as the analysis of an antenna loaded with a bi-anisotropic body of arbitrary shape. Edward is the principal investigator of many research projects amounting to over US$10 million. He has authored/co-authored 270 papers in top-notch journals. Moreover, he has presented over 200 articles in international conferences where he has won many outstanding paper prizes. He is also active in consultancy and technology transfers. He holds four patents. For his contributions in applied research, he was awarded many prizes and commendations.