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Apparatus and method for identifying multiple transponders

  • US 5,602,538 A
  • Filed: 07/27/1994
  • Issued: 02/11/1997
  • Est. Priority Date: 07/27/1994
  • Status: Expired due to Term
First Claim
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1. A method of identifying a plurality of transponders entering into an inquiry field of an interrogation unit, the method comprising the steps of:

  • assigning a unique identification code to each of said plurality of transponders;

    generating and sending an interrogation pulse, said interrogation pulse including any identification code stored in an interrogation unit memory;

    receiving said interrogation pulse and comparing said identification code therein with said unique identification code;

    sending a response to said interrogation pulse if said identification codes are not equal, said response including said unique identification code;

    receiving a recognizable response from said plurality of transponders and storing said identification code included therein, wherein said recognizable response is the response with the greatest field strength.

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