Novel time-domain asymptotic-numerical solution for backward transient scattered magnetic field from a coated metal cylinder

Abstract

A novel time-domain (TD) asymptotic-numerical solution (novel TD-ANS) is proposed for a backward transient scattered magnetic field when an ultra-wideband (UWB) pulse wave is incident on a coated metal cylinder which is made of a metal cylinder covered with a homogeneous medium layer. The TD-ANS is expressed by two kinds of notations. First is represented by a combination of a direct geometric optical ray (DGO) and a reflected GO (RGO). Second is given by a combination of a DGO and a RGO series. The TD-ANS is useful in understanding backward transient electromagnetic wave scattering because it can reproduce the wave packet of a reflected wave by superposing multiple RGO components. The accuracy and validity of the TD-ANS are confirmed by comparing with a reference solution.