SCATTERING OF ELECTROMAGNETIC-WAVE BY DOUBLE GRATING LOADED WITH 3 LAYERED DIELECTRIC SLABS

This paper deals with electromagnetic wave scattering by an infinite plane metallic double grating with three dielectric layers in case of E- and H-waves excitations. The field expressions for this problem are obtained by making use of superposition of the results of the single grating case (1). The analytical method used here is based on the spectral domain method combined with the sampling theorem. Some numerical results are presented for the near fields such as the surface current distributions on the strips and for the far fields such as the frequency characteristics as well as the insertion loss from the viewpoint of a polarization discriminator.