Diffraction pattern functions of a wedge composed of metal and lossless dielectric illuminated by an E-polarized plane wave

Diffraction pattern functions of an E-polarized scattering by a wedge compo sed of perfectly conducting metal and lossless dielectric with arbitrary pe rmittivity are analyzed by applying an improved physical optics approximati on and its correction. The correction terms are expressed into a complete e xpansion of the Neumann's series, of which coefficients are calculated nume rically to satisfy the null-field condition in the complementary region.