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Radar detector

  • US 4,280,223 A
  • Filed: 09/13/1979
  • Issued: 07/21/1981
  • Est. Priority Date: 03/14/1977
  • Status: Expired due to Term
First Claim
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1. An improved radar detector comprising a housing, an elongated tubular waveguide disposed within said housing, an elongated dielectric antenna having a first tapered portion projecting into said waveguide for matching the impedances of said antenna and said waveguide, said antenna having a second portion projecting outwardly from said housing for collecting radar signals, said second portion of said dielectric antenna includes a first frusto-conical portion and a second frusto-conical portion connected by an elongated substantially cylindrical portion, means for detecting radar signals received within said waveguide, oscillator means, modulator means for receiving a reference signal from said oscillator means and in response modulating the radar signals detected by said detecting means, means for amplifying the signals detected by said detecting means, phase shifter means for receiving the amplified signals from said amplifying means and for shifting the phase of the amplified signals, phase detector means for receiving the reference signal from said oscillator means and the shifted signals from said phase shifter means, and alarm means connected to said phase detector means to produce an alarm signal when the reference and shifted signals received by said phase detector means are synchronous in frequency and have a predetermined phase relation.

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