A hybrid method for the study of plane waves scattering by rough surfaces.

We present a modified version of the curvilinear coordinate method (C.C.M.) for simulating electromagnetic waves scattering by rough surfaces. Numerically the field is obtained from the solution of an eigenvalue problem in Fourier Space. Unfortunately, it appears that the field suffers from parasitic oscillations related to finite spectral resolution. These oscillations are successfully removed by coupling the C.C.M. with the Stratton-Chu formulas