Low Grazing Scattering from a Surface with a Finite Periodic Array of Rectangular Grooves

Junichi NAKAYAMA  Yasuhiko TAMURA  Kiyoshi TSUTSUMI  

IEICE TRANSACTIONS on Electronics   Vol.E92-C   No.1   pp.166-168
Publication Date: 2009/01/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E92.C.166
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Electromagnetic Theory
scattering,  finite periodic surface,  TM wave,  total scattering cross section,  low grazing angle of incidence,  

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This paper deals with the scattering of a transverse magnetic (TM) plane wave from a perfectly conductive surface with a finite periodic array of rectangular grooves. By use of the method in a previous paper [IEICE TRANS. ELECTRON. VOL.E90-C, no.4, pp.903-906, APRIL 2007], the total scattering cross section is numerically calculated for several different numbers of grooves at a low grazing angle of incidence. It is newly found that, when the corrugation width becomes thousands times of wavelength, the total scattering cross section slightly depends on the groove depth and the period, and becomes almost proportional to square root of the corrugation width with a small correction.