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Highly accurate RE-ID positioning system

  • US 5,619,207 A
  • Filed: 06/06/1996
  • Issued: 04/08/1997
  • Est. Priority Date: 10/22/1993
  • Status: Expired due to Term
First Claim
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1. An antenna configuration for accurately determining the position of a transponder in an Radio-frequency Identification RF-ID system comprising:

  • a first and a second balanced receive antenna for receiving a fieldstrength voltage of a response telegram, whrein said response telegram comprises identification data, and has at least the same frequency as the interrogation signal wherein said first and second receive antennas are physically rotated 90 degrees relative to one another;

    a transmitter antenna for transmitting a charge-up signal to said transponder wherein said transponder is charged to a maximum allowable voltage;

    a first and a second receiver for narrow band fitting said receive fieldstrength voltages;

    a first and a second sample and hold circuit for sampling said filtered signals for a first portion of said response telegram; and

    a processing circuit for generating a position coordinate relating to a position of said transponder from said sampled signals.

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