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Object Identification system with adaptive transceivers and methods of operation

  • US 6,362,737 B1
  • Filed: 08/11/1999
  • Issued: 03/26/2002
  • Est. Priority Date: 06/02/1998
  • Status: Expired due to Term
First Claim
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1. A method of determining the identification of at least one radio frequency identification device of a plurality located within communication range of an antenna, the method comprising:

  • determining a frequency for interrogating, wherein determining comprises;

    transmitting via the antenna, wherein transmitting is performed in a relatively narrow band manner with respect to receiving;

    operating for a duration a squelch circuit that is coupled to the antenna;

    receiving via the antenna after lapse of the duration to provide a received signal, wherein receiving is performed in a relatively wide band manner with respect to transmitting;

    determining a property of the received signal; and

    determining the frequency for interrogation in accordance with the property, wherein determining the frequency comprises;

    comparing the property to a limit; and

    if the comparison is unfavorable, ignoring receipt of the received signal;

    interrogating to attempt to determine an identity of a device of the plurality; and

    repeating the determining and interrogating until each device of the plurality has been given at least one opportunity to be identified.

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