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Waveguide-to-microstrip transition

  • US 4,651,115 A
  • Filed: 01/31/1985
  • Issued: 03/17/1987
  • Est. Priority Date: 01/31/1985
  • Status: Expired due to Fees
First Claim
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1. A transition, comprising:

  • a section of rectangular waveguide defining a first axis, said section of rectangular waveguide including first and second mutually-parallel conductive wide walls equally spaced from a first plane in which said first axis lies by a pair of mutually parallel conductive narrow walls, said pair of narrow walls being equidistant from a second plane in which said axis lies, said second plane being orthogonal to said first plane, said section of rectangular waveguide defining a first rectangular waveguide port centered on said axis and a second port also centered on said axis at a point remote from said first rectangular waveguide port;

    a conductive plate defining a circular aperture, said conductive plate being coupled to said rectangular waveguide section at said second port and being oriented orthogonal to said axis with said aperture located equidistant from said pair of narrow walls for reducing the size of said second port to the size of said circular aperture;

    a coaxial transmission line including an outer conductor and a center conductor having a common second axis therewith, one end of said coaxial transmission line being coupled to said circular aperture in such a fashion that said second axis passes through the center of said circular aperture, one end of said center conductor passing through said circular aperture;

    a flat waveguide ridge having sides parallel to and centered on said second plane, and having a first straight edge coupled to said first wide wall, and a second edge at a varying height from said first edge, said height being least in that portion of said ridge nearest said first rectangular waveguide port, said height being greatest in that portion of said ridge nearest said circular aperture;

    a waveguide ridge extension extending between said second edge of that portion of said ridge nearest said circular aperture and said center conductor, said waveguide ridge extension being remote from both said first and second wide walls, thereby defining a rectangular-waveguide-to coax transition having a predetermined bandwidth; and

    a dielectric plate parallel with said second wide wall and located between said second wide wall and said waveguide ridge extension for increasing said bandwidth.

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