Diffraction by a planar junction between a perfectly conducting half plane and a resistive sheet illuminated by a dipole close to its edge

摘要

The problem of evaluating the field diffracted in the far zone by a junction between a perfectly electric conducting (PEC) half-plane and a resistive sheet, illuminated by an arbitrarily oriented dipole, is considered in this paper. The field diffracted by a PEC-resistive sheet junction for plane wave incidence is expressed in terms of an integral along the Sommerfeld contour of a suitable spectral function, which is determined by applying the bisection technique and the Maliuzhinets' (1958) method This integral representation is well suited to analysing the diffracted field far from the edge of the junction, when the saddle point technique is applicable. To describe the field in the vicinity of the junction, the solution has to be expressed as a series of Bessel functions and their derivatives. Finally, a representation of the field diffracted in the far zone by the junction illuminated by an arbitrarily oriented dipole is obtained by reciprocity.