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Radio frequency identification tag identification system

  • US 9,262,657 B2
  • Filed: 10/06/2014
  • Issued: 02/16/2016
  • Est. Priority Date: 03/30/2009
  • Status: Active Grant
First Claim
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1. A method for processing items on which radio frequency identification tags are disposed, comprising:

  • providing a conveyor that conveys items through a path of travel, each item having at least one respective radio frequency identification tag disposed thereon;

    providing an antenna disposed proximate the path of travel, wherein the antenna comprises at least one first element and at least one second element, and wherein the at least one first element is disposed upstream from the at least one second element with respect to the path of travel;

    radiating radio frequency signals into the path of travel from the antenna and receiving, at the antenna, responses to the radio frequency signals from radio frequency identification tags disposed on the items being conveyed by the conveyor through the path of travel;

    at circuitry that is in communication with the conveyor, receiving signals from the at least one first element and the at least one second element corresponding to the responses;

    at the circuitry, determining a difference between magnitude of a said signal corresponding to the response from the at least one first element and magnitude of a said signal corresponding to the response from the at least one second element; and

    at the circuitry, associating information corresponding to a said radio frequency tag with a said item based upon when the difference reaches a minimum.

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