Metallic grating on a periodic anisotropic substrate as a planar Artificial Magnetic Conductor

Abstract

In this paper; a planar Artificial Magnetic Conductor (AMC) constituted of a metallic grating on a periodic anisotropic substrate is proposed. The characteristics of this structure are investigated with a full-wave computational technique which utilizes the dyadic Green's function computed by means of an equivalent transmission line (TL) model in the spectral domain. The obtained Green's function is used in an integral equation for the surface electric current on the metallic grating. The integral equation is then solved using the Method of Moments (MoM) with appropriate basis and test functions. With the help of the proposed semi-analytical method, different periodic structures on various substrates are analyzed. To verify the computed results, they are compared with previously published ones. Finally, the phase response of the introduced periodic structure is calculated as a function of the optic axis direction of the anisotropic region within the substrate. It is shown that the proposed metallic grating on the periodic anisotropic substrate can perform as a low-profile and broadband planar AMC at lower frequencies.