Uniform Physical Optics Diffraction Coefficients for Impedance Surfaces and Apertures

Masayuki OODO
Makoto ANDO

IEICE TRANSACTIONS on Electronics   Vol.E80-C       pp.1056-1062
Publication Date: 1997/07/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Category: Electromagnetic Theory
physical optics,  impedance surfaces,  diffraction coefficients,  field equivalence principle,  

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The key concept of Physical Optics (PO), originally developed for a perfectly electric conductor (PEC), consists in that the high frequency fields on the scatterer surface are approximated by those which would exist on the infinite flat surface tangent to the scatterer. The scattered fields at arbitrary observation points are then calculated by integrating these fields on the scatterer. This general concept can be extended to arbitrary impedance surfaces. The asymptotic evaluation of this surface integration in terms of diffraction coefficients gives us the fields in analytical forms. In this paper, uniform PO diffraction coefficients for the impedance surfaces are presented and their high accuracy is verified numerically. These coefficients are providing us with the tool for the mechanism extraction of various high frequency methods such as aperture field integration method and Kirchhoff's method.