Title:
On Reflection and Transmission Properties of the Metal Strip Gratings and Their Application to Resonant Cavity Antenna
Date:
Friday, October 29, 2010 @ 12:30pm
Location:
E2-393, EITC Building, University of Manitoba Fort Garry Campus
Speaker:
Alireza Foroozesh
Abstract:
Metal Strip Gratings (MSGs) find many applications in antenna design. For example, advantages of using them in the resonant cavity antenna (RCAs), as the superstrate and substrate, have been shown in [1] and [2], respectively.
In this talk, first, some of the fundamentals of the electromagnetic scattering of the MSGs are explained. Using the explicit derivation of the reflected wave, obtained from the Floquet’s modal analysis (or alternatively periodic method of moments) in the spectral domain, the contributions of the reflected wave by the grounded dielectric slab (host medium and the substrate) and the metal strip grating (scatterer) are distinctly determined and discussed. In the same manner, transmitted and reflected electromagnetic EM fields of MSGs on a dielectric slab (the support of the superstrate) are described and presented. The physical insight, that the aforementioned mathematical representation provides, is emphasized. Some observations, based on the results of the above-mentioned numerical computations, are made to shed more light on the MSGs electromagnetic characteristics.
If time permits, some of the applications of MSGs to the RCA superstrate design are pointed out. Mostly, results on far-field radiation patterns of these antennas are presented and discussed to show the effectiveness of these superstrates. High-gain omnidirectional as well as highly-polarized RCAs can be designed by exploiting the unique features of the MSGs [1].
References:
[1] G. Lovat, P. Burghignoli, F. Capolino, D. R. Jackson and D. R. Wilton, “High-gain omnidirectional radiation patterns from a metal strip grating leaky-wave antenna,” in Proc. IEEE AP-S Int. Symp., 2007.
[2] A. Foroozesh, L. Shafai, and M. Ng Mou Kehn, “Application of polarization and angular dependent artificial ground planes in compact planar high-gain antenna design,” Radio Sci., vol. 43, RS6S03, doi:10.1029/2007RS003795, 2008.
Speaker Bio:
Alireza Foroozesh received the B.Sc. degree from Tehran Polytechnic, Tehran, Iran, the M.Sc. degree from the Iran University of Science and Technology, Tehran, and the Ph.D. degree from the University of Manitoba, Winnipeg, Manitoba, Canada, in 1996, 1999, 2007, respectively, all in electrical engineering. From January 2000 to April 2000, he was an RF maintenance engineer with the Informatics Service Company, Tehran, Iran. From May 2000 to July 2002, he was a Researcher with the Antenna Laboratory, at Iran Telecommunication Research Center (ITRC), where he was involved in projects related to antenna design and measurement. He is currently a post-doctoral fellow with the department of electrical and computer engineering, at the university of Manitoba. His current research activities are analysis and modeling of periodic structures and their applications to antenna design and performance enhancement.
Cost:
This will be a free event.
Contact:
For questions or more information: Vladimir Okhmatovski 480-1432
