Asymptotic analysis methods for scattered fields by a coated conducting cylinder

In this paper, we study the asymptotic analysis methods taken into account the effect of the scattering phenomena inside a coating medium. Specifically, we derive both an extended UTD solution for a reflected-surface diffracted ray (RSD) effective in the transition region near the GB_p and a reflected-geometrical ray (RGO) solution in the lit region away from the GB_p. The validity and the applicability of the asymptotic solutions derived here are confirmed by comparing with the exact solution obtained from the eigenfunction expansion.