Multi-band Reflector Antenna Feed Design Based on Coaxial Structure

Abstract

A multi-band feed design for a parabolic reflector antenna, which allows to combine the VHF and UHF frequency ranges operation in a single antenna, is presented in this paper. Electrodynamic modeling of the developed feed was carried out, its characteristics were optimized to maximize reflector antenna efficiency. A feed prototype was manufactured, its characteristics were measured. The proposed feed design based on a coaxial structure allows to expand functionality of reflector antennas by adding the feed operating ranges to existing systems. With the growth of the technical capabilities of the receiving and transmitting parts of antenna's systems - an expansion of working bands or an addion other frequency ranges to the existing feeds of the reflector antennas are quite an urgent task. In addition, a considered antenna, based on a coaxial structure, has several advantages and can be used as a separate antenna with a good bandwidth and high directivity.