Abstract: | In this paper, a theoretical analysis of scattering from a doubly frequency selective surfaces (FSS) with dielectric and metallic
losses in the millimeter wave range is presented. The theoretical analysis involves the solution of the electric field integral
equation relating the induced current in the FSS in the presence of anisotropic dielectric layers. The method of moment is
employed to obtain numerical results. The frequency selective surface structure considered is composed by conducting patch
elements sandwiched between two anisotropic dielectric layers. Three different anisotropic materials are considered: Epsilam-10,
Alumina, and Sapphire. The sapphire presents low losses when compared with the other two dielectric materials. The most common
metals, as copper and aluminum, are considered in this analysis. None significant metallic losses were observed for any considered
metal. Numerical results are presented for the scattering characteristics and for dielectric and metallic losses parameters. |