Theoretical analysis of the radiation fields of parabolic reflector antenna fed by circular shaped microstrip antennas

Abstract

Two theoretical analysis methods; Aperture Field Method (AFM) and Induced Current Method (ICM),have been studied for obtaining the radiation fields of parabolic reflector antenna fed by two types of microstrip antenna.Calculations have been made of the radiation parameters and patterns of parabolic reflector, when exciting its surface by Circular (CRMA) and outer shorted Annular(ARMA) Ring Microsrtip Antenna. These calculations give the best results, for the aperture diameter (D=20λ) and ratio (f/D) that taken at edge illumination about (-3dB). As a result, both methods are in a complete agreement in studying of radiation patterns in principle planes (E and H) at far-field region.