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Multiple frequency antenna feed

  • US 5,041,840 A
  • Filed: 04/13/1987
  • Issued: 08/20/1991
  • Est. Priority Date: 04/13/1987
  • Status: Expired due to Fees
First Claim
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1. A antenna feed comprising:

  • an outer circular waveguide having a central axis and cross-sectional dimension;

    an inner circular waveguide having a central axis, a cross-sectional dimension less than the cross-sectional dimension of the outer waveguide, and positioned inside of the outer waveguide so that the outer waveguide central axis is aligned with the inner waveguide central axis;

    a plurality of patch elements arranged as a circular array about an array center point and positioned adjacent a forward end of the outer waveguide; and

    a conical horn, having a small openings and a large opening, the small opening positioned adjacent the forward end of the outer waveguide and the large opening adjacent and coaxial with the array center point.

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