Radiation Characteristics of Gregorian Antennas with Resonant Size Reflectors

Abstract

The iterative calculation method for radiation characteristics of Gregorian antenna is proposed for resonant frequency range. The method accounts for interactions between reflectors. Proposed procedure uses calculation method for electromagnetic scattering by conducting unclosed screens with finite thickness for each iteration. Last one is based on using the E-field integral equation that takes into consideration approximate surface impedance boundary conditions (SIBC). Radiation patterns for Gregorian antenna have been obtained for different sizes of subreflector and feed placement. The number of iterations has been estimated for obtaining stable radiation pattern data.