Cancellation of High Cross-Polarization of an Offset Parabolic Reflector Antenna using a Rectangular Matched Feed

Abstract

This paper presents the design and the experimental results of a dual‑mode rectangular‑matched feed. This type of feed cancels the unwanted high cross‑polarization generated by the offset parabolic reflector antenna. In order to design this feed, higher order TE11 mode has been added in correct amplitude and phase with the fundamental TE01 mode in a rectangular structure. The proposed feed was then used as a primary feed to illuminate a linearly polarized offset parabolic reflector antenna. Through experimental results, it is verified that such a feed suppresses the undesired high cross‑polarization introduced by the offset geometry of an offset reflector antenna. This kind of feed is very much suitable for monopulse tracking radar.