Rigorous EM Scattering Solution From a Slit in an IBC Plate With Different Surface Impedances Placed Between Two Different Chiral Media

A Kobayashi potential (KP) method is an accurate and fast technique for analyzing electromagnetic (EM) scattering. In this article, the EM scattering from a slit in an impedance boundary condition (IBC) plate with different surface impedances on its both sides placed on interface of two different chiral media is analyzed by the KP method for both right circularly polarized (RCP) and left circularly polarized (LCP) excitations. A chirality parameter is a more degree of freedom—than dielectrics—presented by a chiral medium to affect the EM scattering. Initially, Fresnel coefficients are calculated as closed-form formulas; then, the slit’s contribution is expressed in terms of unknown weighting functions. Next, the method automatically and analytically satisfies boundary and radiation conditions applying Weber–Schafheitlin (WS) integrals, which leads to infinite summations. The infinite summations are effectively truncated with high accuracy. Finally, the weighting functions and, subsequently, the EM scattering are calculated. A finite-element method (FEM) and a convergence analysis are carried out to validate the formulations. The effects of different parameters of the problem on the EM scattering are also analyzed. It is shown that the maximum scattered fields are occurred at non-specular angles. Also, this solution can be a facilitator to analyze the inverse scattering of the problem to determine the properties of the structure.