Investigation of a Loop Antenna as a Feed Element for Parabolic Reflectors Using the Body of Revolution Approach

Abstract

A recently published technique that is based on the body of revolution approach is applied in this paper to investigate the radiation characteristics of a circular loop antenna as a feed element of a small parabolic reflector. The study shows that, a small parabolic reflector antenna of diameter 0.3 m that is fed by a resonant circular loop at 2.4 GHz can be designed to give a directivity of 12.75 dB with reflection coefficient less than -28 dB based on 75Ω line. The H- and E-plane HPBWs of the antenna are 29.8º and 37.8º respectively. Moreover, the current density on the surface of the loop feed reflector is computed using the body of revolution approach. Keywords: Bodies of revolution, circular loop antennas, feed elements, loop feed reflector, parabolic reflector, radiation pattern.