Application of point-matching method to scattering from quadrilateral cylinders

The possibility of constructing computer programs with the capability of generating detailed information on the scattering characteristics of a wide class of perfectly conducting cylinders of arbitrary cross-section in the `resonance¿ range has made further investigation of the `point-matching¿ technique of some interest. In the letter, the utility of the point-matching method is explored for a class of quadrilateral cylinders when the region exterior to the scatterer can be described by a set of overlapping domains within which the field can be expanded in terms of complete eigenfunction expansions.