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Doppler radar speed measuring unit

  • US 6,091,355 A
  • Filed: 07/21/1998
  • Issued: 07/18/2000
  • Est. Priority Date: 07/21/1998
  • Status: Expired due to Fees
First Claim
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1. A portable ultracompact radar system for measuring the speed of a moving target by means of a Doppler shift, comprising:

  • a multilayer printed circuit board includes on a top portion a first outer electrically conductive layer onto which a transmit antenna and a receive antenna are patterned, and on a bottom portion a second outer electrically conductive layer formed into a plurality of electrically conductive paths, said second outer conductive layer being in a plane parallel to the plane of said first outer conductive layer, said first and second outer conductive layers having at least one ground plane layer disposed therebetween, each of said layers being electrically isolated from one another by an individual electrical insulation layer; and

    electronic circuitry mounted upon said electrically conductive paths of said second outer conditions layer, the circuitry comprising an oscillator for producing an output signal, said output signal being coupled to a first input of a coupler means for dividing said oscillator output signal into an rf output signal coupled to the transmit antenna, and a local oscillator signal coupled to a first input of a mixer means, the mixer means having a second input receptive of a target reflective signal from the receive antenna, said mixer means operating to combine said local oscillator signal and said target reflected signal to produce a Doppler signal, a microcontroller being receptive of said Doppler signal for processing the same and producing a speed signal for connection to and display by means for displaying the detected speed; and

    means for electrically interconnecting portions of said first and second outer layers and said at least one ground plane layer together.

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