Abstract
The determination of radar cross-sections (RCSs) of targets of simple shape has received much attention and is now a well-studied problem area.1,2 Traditionally, the analytical treatment has used material compositions of the targets with only small amounts of absorption of incident signal power, if any at all. By coating a given target with a thin layer with suitable electromagnetic properties the RCS can be reduced to some extent, and it is of interest to investigate not only the radar cross-section reduction (RCSR) itself but also its effect on the scattering of pulses of short duration. We study the scattering interaction of ultra-wideband (UWB) electromagnetic pulses of short duration with a spherical target. The target is either a perfectly conducting sphere or such a sphere coated with a thin, homogeneous dielectric (Dallenbach1,2) layer. For the dielectric layer, two different, hypothetical, materials are specified. We begin by characterizing each dielectric layer by computing the reflected power when a plane, perfectly conducting plate coated with the layer is illuminated by a continuous wave (CW) at normal incidence in a selected frequency band. Each one of the coatings is then applied on the perfectly conducting sphere, and the (monostatic) RCS is computed, and we compare it with the returned power of the coated plate.
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