Analysis of a Cylindrical Reflector Antenna Encased in a Concentric Dielectric Radome With a Resistive or Pec Inner Circular Grating

Abstract

A regularized solution is presented for a two-dimensional circular reflector antenna system inside a concentric dielectric radome reinforced by an inner resistive circular grating. The directive radiation pattern of the feed antenna is simulated by a Complex Point Source method. Furthermore for a very small resistivity case, an approximate solution for the same problem is presented by considering the grating material is made up of perfectly electric conductor. In this problem, the thickness of the dielectric radome may be arbitrary but the grating material thickness has to be very small compared to the free space wavelength. Various radiation characteristics are obtained and accuracy and convergence of the results are numerically verified. Furthermore, it is shown that a properly located two-element grating can be improving the overall directivity of the reflector antenna system.