Police traffic radar using double balanced mixer for even order harmonic suppression

  • US 5,528,245 A
  • Filed: 02/10/1995
  • Issued: 06/18/1996
  • Est. Priority Date: 02/10/1995
  • Status: Expired due to Term
First Claim
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1. An antenna for a traffic surveillance radar, comprising:

  • a microwave horn for emitting a directional microwave energy beam in a direction said microwave horn is pointed, and for receiving microwave energy reflected from objects in the path of said beam;

    an oscillator for generating a microwave signal;

    a double balanced mixer means for mixing a portion of the microwave energy from said oscillator with reflected microwave energy received by said microwave horn;

    energy guidance means for guiding microwave energy from said oscillator to said microwave horn and for guiding received microwave energy and a sample portion of said energy from said oscillator to said double balanced mixer means while preventing most of said energy from said oscillator from being coupled to said double balanced mixer means and while preventing said received microwave energy from being coupled to said oscillator.

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