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Dual band multimode coaxial tracking feed

  • US 6,323,819 B1
  • Filed: 10/05/2000
  • Issued: 11/27/2001
  • Est. Priority Date: 10/05/2000
  • Status: Expired due to Term
First Claim
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1. An electromagnetic wave interface device comprising:

  • a generally cylindrically nested waveguide structure including an inner section of generally longitudinal waveguide extending along an axis from a first end to a distal end thereof, and an outer stepped section of coaxial waveguide surrounding said inner section of generally longitudinal waveguide along said axis, said outer stepped section having an endwall axially displaced from the first end of the inner section of generally longitudinal waveguide toward the distal end thereof, said inner section of generally longitudinal waveguide having axially displaced sidewalls between the endwall of the outer stepped section of coaxial waveguide and the first end of the inner section of generally longitudinal waveguide;

    a first electromagnetic wave transducer forming a first port of said inner section of generally longitudinal waveguide to interface therewith first signals having a frequency in a first frequency band;

    a second electromagnetic wave transducer forming a second port of said inner section of generally longitudinal waveguide to interface therewith second signals having a frequency in said first frequency band, and mutually isolated from said first signals;

    said first and second ports being located at the axially displaced sidewalls of the inner section of generally longitudinal waveguide;

    a third electromagnetic wave transducer coupled to a first side portion of said outer stepped section of coaxial waveguide and forming a third port to interface said outer stepped section of coaxial waveguide with third signals having a frequency in a second frequency band spectrally spaced apart from said first frequency band; and

    a fourth electromagnetic wave transducer coupled to a second side portion of said outer stepped section of coaxial waveguide, spatially separated from said first side portion thereof and forming a fourth port to interface said outer stepped section of coaxial waveguide with fourth signals having a frequency in said second frequency band, and in a manner that provides mutual isolation between said third and fourth signals.

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