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Antenna with single or double reflectors, with shaped beams and linear polarisation

  • US 5,990,842 A
  • Filed: 03/10/1997
  • Issued: 11/23/1999
  • Est. Priority Date: 03/13/1996
  • Status: Expired due to Term
First Claim
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1. An antenna comprising:

  • a reconfigurable multimode microwave beam forming network (BFN);

    a concave reflector separated from said BFN and providing a shaped beam;

    plural rectangular/square feed horn antennas that are arranged in a cluster, connected to said BFN, and aligned to illuminate said reflector to form the shaped beam;

    means for exciting said antennas in the fundamental mode and in the fundamental mode plus higher modes; and

    at least one rotatable polarizer between said feed horn antennas and said reflector and rotating an electric field so that the direction of the electric field is parallel to a direction of alignment of said feed horn antennas and independent of the antenna'"'"'s final polarization.

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