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Coupler with waveguide transition for an antenna in a radar-based level measurement system

  • US 7,453,393 B2
  • Filed: 01/18/2005
  • Issued: 11/18/2008
  • Est. Priority Date: 01/18/2005
  • Status: Active Grant
First Claim
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1. A coupler mechanism for coupling a coaxial waveguide with a circular waveguide having a TE11 waveguide mode of operation, said coupler mechanism comprising:

  • a coaxial waveguide port for receiving said coaxial waveguide, said coaxial waveguide having a coaxial waveguide impedance;

    a port for coupling said circular waveguide, said circular waveguide having a circular waveguide impedance;

    an impedance transformer;

    a matching waveguide; and

    a body member, said body member having a stepped section, said stepped section receiving said impedance transformer;

    said matching waveguide being coupled to said coaxial waveguide port, said matching waveguide having an impedance matching the impedance of said coaxial waveguide and said matching waveguide further comprising a rounded rectangular waveguide having a quasi-TE10 waveguide mode of operation;

    said impedance transformer having a first port for receiving said matching waveguide, a second port for said circular waveguide and a transition section, said transition section having one or more waveguide transitions and serving to match the impedance of said circular waveguide with the impedance of said matching waveguide; and

    said stepped section in said body member having one or more steps corresponding to said waveguide transitions.

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