DocumentCode :
844086
Title :
High frequency scattering from polygonal impedance cylinders and strips
Author :
Herman, Martin I. ; Volakis, John L.
Author_Institution :
Michigan Univ., Ann Arbor, MI, USA
Volume :
36
Issue :
5
fYear :
1988
fDate :
5/1/1988 12:00:00 AM
Firstpage :
679
Lastpage :
689
Abstract :
An analysis is presented for the high-frequency diffraction by convex polygonal cylinders with arbitrary side impedances. The authors extend their solution for the multiply diffracted fields associated with a double wedge (see ibid., vol.36, no.5, p.664-678, 1988). The analysis thus utilizes the extended spectral ray method (ESRM) that is applicable to nonray optical regions. Diffraction coefficients yielding a uniform total field are given for up to and including all fourth-order mechanisms. An important aspect of this analysis is the rigorous and uniform incorporation of the surface-wave effects in the resulting diffraction coefficients. A general polygon computer code was written that includes up to a third-order mechanisms. Based on this code, backscatter and bistatic patterns are given for impedance cylinders with triangular and square cross sections. The results are found to be in remarkable agreement with corresponding moment method data. As a matter of completeness, uniform diffraction coefficients are presented for a strip (which is a special case of a cylinder) that can have unequal face impedances
Keywords :
backscatter; codes; electromagnetic wave diffraction; electromagnetic wave scattering; backscattering patterns; bistatic patterns; diffraction coefficients; extended spectral ray method; high-frequency diffraction; impedance cylinders; moment method data; multiply diffracted fields; nonray optical regions; polygon computer code; polygonal impedance cylinders; polygonal impedance strip; square cross sections; surface-wave effects; triangular cross sections; uniform total field; Backscatter; Engine cylinders; Frequency; Laboratories; Optical diffraction; Optical scattering; Optical surface waves; Strips; Surface impedance; Surface waves;
fLanguage :
English
Journal_Title :
Antennas and Propagation, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-926X
Type :
jour
DOI :
10.1109/8.192145
Filename :
192145
Link To Document :
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