Analysis of scattered fields by an impedance discontinuity of a planar surface considering the surface wave effects

In this paper, we have studied on scattered fields of the electromagnetic wave by an impedance discontinuity of a planar surface. Based on the aperture field method (AFM), an integral representation for the scattered fields at a receiving antenna is derived, and an asymptotic solution is obtained by using the saddle point technique. We have compared the asymptotic solution composed of the reflected and diffracted rays from the planar surface with the reference solution which includes the effects of the Norton surface wave (surface wave). The validity and utility of the asymptotic solution obtained by using the saddle point technique is clarified by comparing with the reference solutions.