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Multibeam satellite communication antenna

  • US 6,204,822 B1
  • Filed: 05/20/1999
  • Issued: 03/20/2001
  • Est. Priority Date: 05/20/1998
  • Status: Expired due to Fees
First Claim
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1. An antenna system comprising:

  • at least a first antenna assembly each antenna assembly having a spherically-contoured primary reflector having a radius of curvature and a reflective surface toward the inside of the sphere; and

    a feed assembly comprising;

    (1) a spherical-aberration-correcting secondary reflector, and (2) a feed element;

    wherein the secondary reflector and feed element are placed such that their principal axes of symmetry are co-linear and lie upon a line passing through the center of a sphere corresponding to the spherical contour of the primary reflector, and the center of the secondary reflector; and

    wherein the secondary reflector is positioned and shaped such that all possible ray paths starting from the feed and traveling to the secondary reflector from which they are reflected to the primary reflector become substantially the same lengths, such that a point source radiator illuminating the secondary reflector and therefrom the primary reflector produces a collimated quasi-plane wave.

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