A physical optics version of the geometrical theory of diffraction
Abstract
The authors derive a diffraction coefficient which is suitable for calculating the field diffracted by the vertices of perfectly conducting objects. This diffraction coefficient is used to calculate the field scattered by the corner of a metallic sheet. Two diffraction coefficients, one for edges and one for vertices, are derived by solving the appropriate canonical problems using the physical optics (PO) approximation. The diffraction coefficients are calculated by first using the PO approximation which consists of calculating the total field on the surface of an object from the incident field according to the laws of geometrical optics (GO), and then calculating the scattered field by employing this total surface field in a vector diffraction integral. The validity of the diffraction coefficients has been investigated by comparing their predictions with experimental measurements of the scattered field from a single corner of a rectangular metal sheet, and good agreement was found.
 Publication:

IEEE Transactions on Antennas and Propagation
 Pub Date:
 June 1991
 DOI:
 10.1109/8.86868
 Bibcode:
 1991ITAP...39..719T
 Keywords:

 Electric Conductors;
 Geometrical Theory Of Diffraction;
 Physical Optics;
 Apexes;
 Asymptotic Methods;
 Edges;
 Communications and Radar