A method for combining integral equation and asymptotic techniques for solving electromagnetic scattering problems
Abstract
The geometrical theory of diffraction takes advantage of the fact that the Fourier transform of the unknown surface current distribution is proportional to the scattered far field. A number of asymptotic methods are available that provide good approximation to this far field in a convenient analytic form which is useful for deriving an initial estimate of the Fourier transform of the current distribution. An iterative scheme is developed for systematically improving the initial form of the high frequency asymptotic solution by manipulating the integral equation in the Fourier transform domain. A syntheticaperturedistribution scheme is also developed in which the approximate scattered farfield pattern obtained by asymptotic techniques is improved by systematically correcting the scattered field distribution on an aperture erected in juxtaposition with the obstacle.
 Publication:

Ph.D. Thesis
 Pub Date:
 1976
 Bibcode:
 1976PhDT........80K
 Keywords:

 Asymptotic Methods;
 Electromagnetic Scattering;
 Integral Equations;
 Problem Solving;
 Antenna Radiation Patterns;
 Current Distribution;
 Far Fields;
 Fourier Transformation;
 Communications and Radar