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Coaxial-wave guide coupling assemblages

  • US 4,967,168 A
  • Filed: 08/31/1989
  • Issued: 10/30/1990
  • Est. Priority Date: 08/31/1989
  • Status: Expired due to Fees
First Claim
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1. The improvement in an assemblage comprising:

  • a waveguide structure comprising, first and second vertically spaced horizontal metal walls bounding opposite sides of a wave-propagation chamber providing for horizontal passage between such walls of high frequency electromagnetic energy, such first and second walls having respectively formed therein relatively large and small vertical coaxial bores of which the large bore passes through said first wall to said space, and the small bore extends from such space at least partly through said second wall; and

    a coaxial coupler unit for such energy comprising;

    a tubular outer conductor having an axis and a front end and having a forward portion which extends axially rearward from the front end of such outer conductor, and an axially elongated inner conductor passing in spaced coaxial relation forwardly through said outer conductor and having, in its length, central and forward sections which are, respectively, disposed within said outer conductor and in front of such outer conductor to provide by the latter section a pin projecting axially outward and forward from the front end of said outer conductor, said pin having a forward portion which extends axially rearward from the front end of said pin, said coaxial unit being vertically aligned with the common axis of said coaxial bores and having a lower part inserted in such bores so that at least respective parts of said forward portion of said outer conductor and said pin are respectively received in said large and small bores in, respectively, said first and second metal walls to make electric contacts with metallic surface regions of such two walls extending around said bores at the sides thereof; and

    said improvement comprising the features that the surface of said first wall on the interior wall surface of said large bore and said forward portion of said outer conductor have a region of mutual contact angularly extending all around such portion and axially disposed adjacent to the opening of said large bore into said chamber, said first wall exerting radially inward force on such forward portion to produce therebetween a pressure contact distributed around such region, the axial extent of such region of pressure contact being substantially less than a minority of the distance over which said outer conductor and the interior wall of said large bore are axially coextensive, and that the part of said outer conductor within said large bore and to the rear of said mutual contact region has over its length a largest outer diameter less by at least a clearance than the smallest inner diameter over said length of said large bore.

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