Comparison and improvement of the diffracted current basis functions for the MM-PO technique [method of moments-physical optics technique]

As a canonical problem, scattering by an infinite wedge is the subject of continuing investigations for its engineering applications. In this paper, we study Burnside´s diffracted current basis function and Bilow´s, and then compare its numerical results with exact solutions. In general, the latter performs better. But in E-polarized cases Bilow´s basis function also results in serious errors. In terms of the theory of diffraction and the fundamental theory of electromagnetism, we modify their basis functions both within and outside the transition regions.