Design of offset-parabolic-reflector antennas for low cross-pol and low sidelobes

The results of a computational study on the radiation properties of offset prime-focus-reflector antennas are reported. Emphasis is on reducing sidelobes and cross polarization without sacrificing gain. The influence of feed pointing is examined in detail. A simple technique is introduced for determining the feed-pointing direction. This technique yields near-minimum sidelobe levels over practical ranges of feed pointing, with only small penalties in gain and cross polarization.<
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