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Horn antenna and mixer construction for microwave radar detectors

  • US 4,571,593 A
  • Filed: 05/03/1984
  • Issued: 02/18/1986
  • Est. Priority Date: 05/03/1984
  • Status: Expired due to Term
First Claim
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1. A horn antenna construction for use in microwave detection circuits, comprising:

  • a substantially rigid and planar mounting board having upper and lower surfaces;

    a microstrip board on the upper surface of said mounting board, having at least one mixing diode and a feed strip therefor, where the feed strip is located at or near a first edge of the microstrip board and on the upper, exposed side thereof;

    and a one-piece molded horn element having an open bottom, an upwardly flared top wall and a pair of side walls, and having a downwardly extending range formed on the underside of said top wall;

    where said ridge extends rearwardly to the throat of said horn, and extends downwardly at least in said throat area to an extent that when said one-piece molded horn element is secured to the upper side of said mounting board, the bottom edge of said ridge in said throat area is brought into physical and electrical contact with said feed strip, and the upper surface of said mounting board forms the bottom wall of the horn.

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