Time-domain techniques for transient scattering from dielectric bodies

The time-domain electric, magnetic and combined field integral equations (TDEFIE, TDMFIE and TDCFIE) have been applied widely to the analysis of transient scattering from targets. In this paper, a surface integral equation (TDCFIE) approach is utilized to calculate the transient scattering from arbitrarily shaped, three-dimensional dielectric bodies. In conjunction with the marching-on-in-time method, the TDCFIE-MOT method is used to derive explicit expressions for the present-time current as a function of the incident field and the past history. Sample results showing various geometries are presented and are compared with other numerical techniques. Finally, by an incident Gaussian plane tapered wave, transient scattering from the sea surface developed by Jonswap´s sea spectra is computed.