Abstract
The depolarizing effects of offset parabolic reflector antennas are addressed through the use of an over-moded primary feed based on printed patch antennas. The modes of interest are the TM11 and TM21 modes of circular microstrip patch antennas. It will be shown that the proposed matched feed is reasonably comparable with its waveguide-type counterparts, as it is capable of reducing the unwanted cross polarization of offset reflector antennas to well below −32 dB at both asymmetry and diagonal planes.
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