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Multi-frequency antenna feed

  • US 6,720,932 B1
  • Filed: 09/19/2001
  • Issued: 04/13/2004
  • Est. Priority Date: 01/08/1999
  • Status: Expired due to Term
First Claim
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1. A single antenna feed structure having a first central waveguide operating at a first frequency band and at least one outer waveguide substantially coaxial with the central waveguide and operating at a second frequency band, said first waveguide being excited by excitation means disposed in said waveguide, and said second waveguide being excited by radiation from a non-circular waveguide feed structure disposed orthogonally to the longitudinal axis of the outer waveguide and including a first feed for horizontally polarized signals and a second feed for vertically polarized signals so as to set up respective horizontally and vertically polarized fields in said at least one outer waveguide and said feed structure having an isolation bar disposed in the outer waveguide and between an outer surface of the inner central waveguide and an inner surface of the outer coaxial waveguide on both sides of the inner waveguide and in a plane orthogonal to the first and second non-circular waveguides, and signal rotation means disposed in said outer waveguide for rotating the polarized signals in said outer waveguide.

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