Electromagnetic Scattering by Periodic Grating of Pec Bars

Abstract

Electromagnetic wave scattering by a periodic array of perfectly conducting bars is studied in this paper. In the proposed approach the amplitudes of the spatial harmonics in free space above and below the array are expanded in a Fourier series with coefficients being properly chosen Legendre polynomials. As a result, the boundary and edge conditions are satisfied directly by field representation. The method results in a small system of linear equations for unknown expansion coefficients to be solved numerically. Some numerical examples are given, presenting a comparison to the mode matching technique.