Transmission-Line Metameterials and Related Structures: Fundamentals & Applications

Prof. George Eleftheriades
University of Toronto
Department of Electrical and Computer Engineering
Canada

Abstract
Over the past decade there has been intense interest in artificial materials with unusual electromagnetic properties that cannot be found in nature. Therefore these materials are referred to as “metamaterials” (meta means beyond in Greek). The most representative metamaterial is characterized by a negative index of refraction. The feasibility of media which simultaneously exhibit negative permittivity and negative permeability, hence a negative refractive index, has been known since the sixties. However it is only in the past decade that people invented ways to realize them. In this seminar we will first describe the fundamentals of transmission-line metamaterials (MTMs). We will then present a number of applications of transmission-line metamaterials including super-lensing in free space, multi-band/broadband passive and active RF/microwave components, small multi-functional MTM-inspired antennas, non-Foster antennas, reduced mutual-coupling antennas for MIMO, and broadband cloaking. We will also introduce the concepts of the "metascreen" and "super-oscillation array" and describe their sub-wavelength imaging properties.

Biography
George V. Eleftheriades earned his Ph.D. and M.S.E.E. degrees in Electrical Engineering from the University of Michigan, Ann Arbor, in 1993 and 1989 respectively. Currently he is a Professor in the Department of Electrical and Computer Engineering at the University of Toronto where he holds the Canada Research/Velma M. Rogers Graham Chair in Engineering. Eleftheriades introduced the concept of utilizing transmission lines to realize negative-index metamaterials in 2002. Together with his graduate students he has produced the first experimental demonstration of focusing beyond the diffraction limit with a Veselago-Pendry lens and invented a number of novel and practical antenna/microwave devices.  Eleftheriades is the recipient of the 2008 IEEE Kiyo Tomiyasu Technical Field Award. He is an IEEE Fellow and has been elected Fellow of the Royal Society of Canada in 2009. He has been the general chair of the 2010 IEEE Intl. Symposium on Antennas and Propagation and CNC/USNC/URSI Radio Science Meeting which was held in Toronto, Canada July 11-17, 2010.  Together with his graduate students he co-authored several award-winning papers including the 2010 IEEE Microwave and Wireless Components Best Paper Award, and twice (2008 &2012) the RWP King Best Paper Award from the IEEE Transactions on Antennas and Propagation .