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Moving vehicle transponder

  • US 5,376,943 A
  • Filed: 07/02/1993
  • Issued: 12/27/1994
  • Est. Priority Date: 09/07/1990
  • Status: Expired due to Fees
First Claim
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1. A transponder tag operable in the UHF range of frequencies comprising:

  • a substrate of dielectric material having first and second sides;

    a first conductive coating formed on said first side of said substrate to provide a dipole antenna and a ground plane and to define a slot line within the ground plane forming a balanced antenna feeder leading to the centre of said dipole antenna;

    a second conductive coating on said second side of said substrate forming a pattern of conductors opposite said ground plane; and

    receiver circuit means, signal processing circuit means and transmitter circuit means mounted on said second side of said substrate, said pattern of conductors providing circuit interconnections between said receiver circuit means and said signal processing circuit means, and between said signal processing circuit means and said transmitter circuit means, and providing a transmission line electromagnetically coupling said receiver and transmitter circuit means to said slot line;

    said receiver circuit means including means to demodulate a received UHF signal and said signal processing circuit means including means to provide data characterizing said transponder tag for transmission by said transmitter circuit means by way of said dipole antenna.

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