Scattering of Antenna Beams By Local Cylinders

Abstract

Two-dimensional scattering by conducting circular cylinders of small to moderate size in wavelengths in the presence of local directive sources is rigorously analyzed. The sources are both extended apertures, represented by arrays of complex source point (CSP) beams and by single CSP beams. From scattering patterns the latter are shown to accurately represent cosine squared aperture distributions as sources and with less accuracy other symmetrically tapered distributions. Scattering cross sections calculated show that for E-polarized local sources the cross section first decreases and then increases with increasing directivity whereas for H-polarized sources the reverse occurs. An explanation for this unexpected behavior is offered.