Perturbation method solution of TE scattering from a cylinder above an infinite periodic surface

The multipath phenomenon is known to decrease the detection ability of radars at low-grazing angles. Narrow band (CW) analysis of the multipath effect has been studied by many researchers. However, CW radars have limited ability to detect targets above rough surfaces. Therefore, ultrawide band/short-pulse (UWB/SP) radars have become of interest. However, the multipath effect is not well understood for short-pulse scattering from a disturbed sea. To help enhance the understanding of UWB multipath, a pertubation method was developed previously for TM polarization. This paper utilizes the perturbation method with TE polarization to provide complete information about transient multipath. In order to simplify the problem, the surface is considered to be perfectly conducting. A transient, short pulse plane wave is assumed to be incident on a cylinder of arbitrary cross section above a two-dimensional periodically-varying conducting surface. In order to calculate the transient scattered field, the analysis is first conducted in the frequency domain and then an inverse Fourier transform (IFT) is used on the spectral results.