Electromagnetic band gap structures and their applications for modern agile antennas
Recently EBG structures have attracted a lot of interest in the antenna and microwave domains because of their ability to control the propagation of electromagnetic waves. EBGs are periodic dielectric or metallic planar structures that can perform spectral, spatial or angular filtering of the incident electromagnetic wave. They can be configured as transparent or opaque surfaces to electromagnetic waves at specific frequency bandwidth, leading to a control of the wave propagation. This fascinating technology can provide innovative and highly efficient solutions for critical problems in antenna design. For instance, EBG structures have been used to increase the antenna gain. Another example, the problem of surface wave excitation that arises in planar antennas can be rectified using EBG structures; this provides the means to isolate individual antenna elements from their respective adjacent elements. More specifically, for agile antennas with beamforming functionality, it would be more attractive to use active EBG structures with controllable radiation characteristics.
In this topic, I will present a talk about active electromagnetic bandgap structures for developing advanced antennas. In this talk, I will first give an overview of electromagnetic band gap structures and their applications in in antenna designs. Next, I will present three different configurations of reconfigurable antennas using various electromagnetic band gap structures. To show the radiation-pattern configurability of these antennas, some example of simulated and experimental results will be presented and discussed. Finally, concluding remarks and will be given.
Tayeb A. Denidni(M’98–SM’04) received M. Sc. and Ph.D. degrees in electrical engineering from Laval University, Quebec City, QC, Canada, in 1990 and 1994, respectively. From 1994 to 2000, he was a Professor with the engineering department, Université du Quebec in Rimouski (UQAR), Rimouski, QC, Canada, where he founded the Telecommunications laboratory.
Since August 2000, he has been with the Institut National de la Recherche Scientifique (INRS), Université du Quebec, Montreal, QC, Canada. He found RF laboratory at INRS-EM, Montreal. He has a great experience with antenna design and he is leading a large research group consisting of three research scientists, six Ph. D students, and one M.Sc. student. He served as a principal investigator on many research project sponsored By NSERC, FCI and numerous industries. His current research areas of interest include reconfigurable antennas using EBG and FSS structures, dielectric resonator antennas, metamaterial antennas, adaptive arrays, switched multi-beam antenna arrays, ultra-wideband antennas, microwave and development for wireless communications systems.
From 2008 to 2010, Dr. Denidni served as an Associate Editor for IEEE Transactions on Antennas Propagation. From 2005 to 2007, Dr. Denidni served as an Associate Editor for IEEE Antennas Wireless Propagation Letters. Since 2004, he has been elevated to the grade of Senior Member of the IEEE. In 2012 and 2013, he was awarded by INRS for outstanding research and teaching achievements.