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Interrogator for detecting adjacent transponders

  • US 5,550,548 A
  • Filed: 06/07/1995
  • Issued: 08/27/1996
  • Est. Priority Date: 07/08/1988
  • Status: Expired due to Fees
First Claim
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1. An interrogator for wireless communication with at least two transponders, said interrogator comprising:

  • a. an RF oscillator;

    b. a transmitter that receives the output of said RF oscillator and initiates an RF interrogation signal for interrogating said at least two transponders;

    c. an antenna operable to receive the output of said transmitter and transmits said RF interrogation signal to said at least two transponders, thereby causing each of said transponders to transmit RF responses, and operable to receive said RF responses;

    d. a receiver for receiving said RF responses via said antenna upon termination of said RF interrogation pulse; and

    e. a control circuit, said control circuit operable to initiate said RF interrogation signal in said transmitter, to disable the output of said transmitter and thereby enable reception of at least one of said RF responses upon termination of said RF interrogation signal, to receive at least one of said RF responses from said receiver, and to measure the duration of said at least one RF response thereby determining whether multiple transponders exist adjacent to each other.

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