|Organizer: IEEE Toronto Section, Electromagnetics And Radiation Joint Chapter|
|Title: Microstrip Antennas with Reduced Surface-Wave and Lateral-Wave Excitation|
Dr. David R. Jackson
Department of Electrical and Computer Engineering
University of Houston
Surface-wave and lateral-wave excitation from microstrip antennas result in undesirable mutual coupling between antenna elements, and also in undesirable edge diffraction of these fields from the edges of the substrate and ground plane. The mutual coupling due to the surface waves and lateral waves causes variations in the scan impedance, including effects such as scan blindness. The edge diffraction of the surface waves and lateral waves may result in significant degradation of the radiation pattern, including front- side pattern rippling and back-side fields. New types of microstrip antenna designs, called "reduced surface wave" microstrip antennas, have been developed to reduce the undesirable excitation of surface waves and lateral waves. The design of these antennas will be discussed, and results obtained from numerical calculations as well as measurements will be presented to verify the improved behavior. The reduced surface wave antennas have much cleaner radiation patterns due to the reduced edge diffraction, and also exhibit much less mutual coupling as the separation between antennas increases. They also have a higher directivity than conventional microstrip antennas, due to their larger size. A challenge for the future will be to make these antennas smaller, while still keeping the improved performance.
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. He is a Fellow of the IEEE, and is presently serving as the Chapter Activities Coordinator for the AP-S Society of the IEEE. He is a past Associate Editor for the IEEE Transactions on Antennas and Propagation, and has also served as a past member of ADCOM for AP-S. He is presently an Associate Editor for the International Journal of RF and Microwave Computer-Aided Engineering. He is also presently the Chair of the Technical Activities Committee for URSI, U. S. Commission B. He is a past Associate Editor of the journal Radio Science and has also served on the Editorial Board of the IEEE Transactions on Microwave Theory and Techniques. His research interests at present include microstrip antenna analysis and design, computer-aided design of microstrip antennas and circuits, periodic structures, leaky-wave antennas, and leakage effects in microwave integrated circuits.
|Time and Location: |
Galbraith Building, Room GB248
University of Toronto,
35 St. George Street
June 1st, 2001,
at 11:00 am.
The Institute of Electrical and Electronics Engineers,
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