Title:
NPlanar Leaky-Wave Antennas
Date:
Monday, April 23 from 10:30 a.m. to 11:30 a.m.
Location:
E2-350, EITC Building, University of Manitoba Fort Garry Campus
Speaker:
Dr. David Jackson
Abstract:
Leaky-wave antennas use a traveling wave to radiate continuously along a radiating aperture in order to produce a focused beam of radiation. Planar leaky-wave antennas are particularly attractive since they use simple dielectric layers and/or metallic screens over a grounded substrate layer. A simple source such as a dipole or slot inside the substrate or on the ground plane excites the leaky waves, which propagate radially outward on the structure, producing a beam. The beam may be either a pencil beam at broadside, or a conical beam, depending on the desired scan angle. In this talk several examples of planar leaky-wave antennas will be given, including those composed of high-permittivity dielectric layers, planar metallic patches or slots, and metallic strips. The performance characteristics will be examined in some detail and it will be shown how the basic properties of all such antennas may be examined in a general manner by studying a canonical structure that consists of a “partially reflecting surface” over a grounded dielectric layer. The case of a metamaterial substrate will also be examined to explore if advantages can be realized with such materials. Finally, the interesting optical phenomenon of directive beaming will be explored, and it will be shown that this is also due to a leaky wave propagating on the planar structure.
Speaker Bio:
David R. Jackson was born in St. Louis, MO on March 28, 1957. He obtained the B.S.E.E. and M.S.E.E. degrees from the University of Missouri, Columbia, in 1979 and 1981, respectively, and the Ph.D. degree in electrical engineering from the University of California, Los Angeles, in 1985. From 1985 – 1991 he was an Assistant Professor in the Department of Electrical and Computer Engineering at the University of Houston, Houston, TX. From 1991 to 1998 he was an Associate Professor in the same department, and since 1998 he has been a Professor in this department. His present research interests include microstrip antennas and circuits, leaky-wave antennas, leakage and radiation effects in microwave integrated circuits, periodic structures, and EMC. He is presently serving as the Chair of the Transnational Committee of the IEEE AP-S Society. He is also on the Editorial Board of the IEEE Transactions on Microwave Theory and Techniques. Previously, he has been the Chapter Activities Coordinator for the IEEE AP-S Society, a Distinguished Lecturer for the AP-S Society, an Associate Editor for the IEEE Transactions on Antennas and Propagation, and a member of the AdCom for the AP-S Society. He has also previously served as the Chair for URSI, U.S. Commission B. He has also served as an Associate Editor for the Journal Radio Science and the International Journal of RF and Microwave Computer-Aided Engineering.
Cost:
This will be a free event.
Contact:
For questions or more information: Vladimir Okhmatovski 480-1432
