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RF systems and methods for tracking and singulating tagged items

  • US 7,800,500 B2
  • Filed: 03/05/2008
  • Issued: 09/21/2010
  • Est. Priority Date: 06/09/2006
  • Status: Active Grant
First Claim
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1. A method, comprising:

  • scanning a zone in an active mode at a first power level for identifying presence of a tag, the tag using at least some battery power to respond to the scanning in the active mode; and

    scanning portions of the zone in a passive mode at a second power level for again identifying presence of the tag, the tag not using battery power to respond to the scanning in the passive mode.

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