Fast Physical Optics Algorithms for High Frequency Scattering
By: Prof. Amir Boag
School of Electrical Engineering
Tel Aviv University, Tel Aviv 69978,
Characterization of communication channels is often relying on electromagnetic modeling of complex scattering and propagation phenomena. Also, many radar and sensing applications require evaluation of the fields scattered from complex objects. At high frequencies, where the physical Optics (PO) approximation is valid, the scattered field can be divided into a series of separate contributions, depending on the number of bounces. For concave geometries, accurate computation of the scattered field requires, taking into account the first, second and, at times, even higher order terms in the series, namely, the “single-bounce” (SB), “double-bounce” (DB) and “multi-bounce” (MB) contributions. In terms of the computational complexity (CC), evaluation of the PO integrals associated with these SB, DB and, especially, the MB contributions is still too high for many applications.
In this talk, we first present fast algorithms for the evaluation of the SB and DB contributions to the PO scattering integrals over a range of aspect angles, frequencies, and distances, including both far- and near-field scenarios. We then turn to a fast iterative physical optics (IPO) algorithm for the analysis of scattering from large complex geometries involving MB and self-shadowing effects. Such SB, DB, and iterative, fast-PO algorithms achieve significant reduction in the CC. Extension of the IPO algorithm for the analysis of scattering from large complex semi-transparent geometries is also proposed.
About the Speaker:
Prof. Amir Boag received the B.Sc. degree in electrical engineering and the B.A. degree in physics in 1983, both Summa Cum Laude, the M.Sc. degree in electrical engineering in 1985, and the Ph.D. degree in electrical engineering in 1991, all from Technion – Israel Institute of Technology, Haifa, Israel.
From 1991 to 1992 he was on the Faculty of the Department of Electrical Engineering at the Technion. From 1992 to 1994 he has been a Visiting Assistant Professor with the Electromagnetic Communication Laboratory of the Department of Electrical and Computer Engineering at the University of Illinois at Urbana-Champaign. In 1994, he joined Israel Aircraft Industries as a research engineer and became a manager of the Electromagnetics Department in 1997. Since 1999, he is with the Physical Electronics Department of the School of Electrical Engineering at Tel Aviv University, where he is currently a Professor.
Dr. Boag’s interests are in computational electromagnetics, wave scattering, imaging, and design of antennas and optical devices. He has published over 110 journal articles and presented more than 250 conference papers on electromagnetics and acoustics. Prof. Boag is an Associate Editor for IEEE Transactions on Antennas and Propagation. He is a Fellow of the Electromagnetics Academy. In 2008, Amir Boag was named a Fellow of the IEEE for his contributions to integral equation based analysis, design, and imaging techniques.