Scattering by a PEC Half-Plane Between Isorefractive Media

The uniform asymptotic physical optics approach is implemented to investigate the plane wave diffraction due to a perfect electrically conducting half-plane located at the interface between two lossless isorefractive media. The incidence direction is assumed to be oblique with respect to the edge. The proposed approach takes advantage of the equivalence principle to solve the original diffraction problem as a superposition of the diffraction problems related to the isorefractive half-spaces. The corresponding electric and magnetic equivalent surface currents are determined under the physical optics approximation and assumed as sources to evaluate the diffraction contributions. These last are obtained at the end of an analytical procedure and expressed in the context of the uniform geometrical theory of diffraction. A full-wave electromagnetic solver is used to validate the resulting solutions.