High Frequency Asymptotic Evaluation of PO Integral for EM Scattering from PEC Circular Cylinder

In this paper, the scattering field from a circular conducting cylinder has been estimated by the high frequency asymptotic evaluation of physical optics (PO) integral for the case of transverse magnetic (TM) polarization. The steepest descent path (SDP) method has been used to estimate the scattering radiation integral. An approximation has also been proposed to estimate the scattering far field at the vicinity of the forward direction. The asymptotic results are compared with those by numerical integration method and the exact eigenfunction expansion solution.