ELECTROMAGNETIC SCATTERING FROM PERFECTLY CONDUCTING ROUGH SURFACES (A NEW FULL-WAVE METHOD)

A new full wave method is developed for scattering from a perfectly conducting rough surface. The new method does not make use of the telegraphist's equations, and takes into account the two-dimensional roughness of the surface from the start. It is shown that the scattering coefficients obtained agree with those given in earlier work by Bahar. The new method is based on a reduction of the three-dimensional scattering problem to a two-dimensional problem by expanding each rectangular component of Maxwell's equations in terms of local basis functions along the perpendicular direction to the mean surface. The transformed two-dimensional field equations are solved using Fourier transforms. The full wave solutions are also compared with the first-order perturbation solutions, the Kirchhoff-type solutions, and integral equation results.