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Progress In Electromagnetics Research
ISSN: 1070-4698, E-ISSN: 1559-8985
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RCS OF LARGE BENT WAVEGUIDE DUCTS FROM A MODAL ANALYSIS COMBINED WITH THE KIRCHHOFF APPROXIMATION

By C. Bourlier, H. He, J. Chauveau, R. Hémon, and P. Pouliguen

Full Article PDF (1,407 KB)

Abstract:
In this paper, we present a fast method to predict the monostatic Radar Cross Section (RCS) in high-frequency of a cavity, which can be modeled as a succession of bent waveguides of the same cross section and stuffed by a perfectly-conducting termination. Based on a modal analysis combined with the Kirchhoff Approximation, this method allows us to obtain closed-form expressions of the transmission matrix at each discontinuity. In addition, to improve the efficiency, a selective modal scheme is proposed, which selects only the propagating modes contributing to the scattering. Compared to the Iterated Physical Optics (IPO) method and the Multi-Level Fast Multipole Method (MLFMM, generated from the commercial software FEKO), this approach brings good results for cavities with small tilt angles of the bends, typically smaller than 2 degrees.

Citation:
C. Bourlier, H. He, J. Chauveau, R. Hémon, and P. Pouliguen, "RCS of large bent waveguide ducts from a modal analysis combined with the kirchhoff approximation," Progress In Electromagnetics Research, Vol. 88, 1-38, 2008.
doi:10.2528/PIER08101708
http://www.jpier.org/PIER/pier.php?paper=08101708

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