Multiple beam antenna system
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United States of America Patent
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-
Apr 27, 1993
Grant Date -
N/A
app pub date -
Oct 31, 1990
filing date -
Oct 31, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A multiple beam antenna system may be constructed for reducing a spillover loss n efficiency, improving beam crossover, and reducing undesired sidelobes by the addition of three dielectric lenses between a feed horn cluster connected to a beam forming network and an objective collimator. The system includes a beam forming network including a plurality of feed horns in a feed horn cluster, an objective, and an imaging lens having a lateral magnification less than unity for focusing a reduced image of the feed horn cluster at a predetermined point in space. A field lens is positioned at that predetermined point in space, and an amplitude shaping lens is positioned between the field lens and the objective. The amplitude shaping lens redirects the rays of the image transmitted by the field lens to be denser in the central region of the objective, and reduce the sidelobes of the far field pattern of the transmitted beams.
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