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Launcher for plural band feed system

  • US 5,818,396 A
  • Filed: 08/14/1996
  • Issued: 10/06/1998
  • Est. Priority Date: 08/14/1996
  • Status: Expired due to Term
First Claim
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1. A feed system for an antenna, the feed system comprising:

  • an inner electrically conducting tube and an outer electrically conducting tube, a space within the inner tube constituting an inner feed waveguide, and a space between the inner tube and the outer tube constituting an outer feed waveguide;

    means for applying a higher frequency radiation to the inner feed waveguide, and a launcher for launching a wave of lower frequency radiation in the outer feed waveguide;

    wherein said feed waveguides have coaxial radiating apertures for radiation of signals at the higher and the lower frequencies from a common phase center; and

    said launcher comprises a set of ridged launch waveguides merging with said outer feed waveguide, there being a tapering of ridges of said launch waveguides from a maximum value distant from said outer feed waveguide to a minimum value within a portion of said outer feed waveguide adjacent said launcher.

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