Ultra-Near Fields of Bodies of Translation With Discontinuities: ω-κ Representations

Abstract

Ultra-near fields scattered from bodies of translation (BOTs) with surface and gap discontinuities are analyzed using frequency wave vector (w-k) representations. The scattering surfaces are assumed to be perfectly electrically conducting (p.e.c.) and can be electrically large. The theoretical formulation is based on first principles. The electric field integral equation (EFIE) for the BOT scatterer is solved by the method of moments (MM). Next the scattered fields in the operator form of the EFIE are Fourier transformed over the spatial domain. The resulting ω-κ representation delineates the propagated and evanescent waves near the scattering surface. The analytical results are compared with experimental data.