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Tag reading method and apparatus

  • US 20050133597A1
  • Filed: 05/26/2004
  • Published: 06/23/2005
  • Est. Priority Date: 12/18/2003
  • Status: Active Grant
First Claim
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1. A tag reading method for supplying power to at least one of a plurality of superimposed tags and reading information from the tag, comprising the steps of:

  • supplying power, which is produced by high-frequency signals, to each tag by generating electromagnetic waves from a plurality of locations by the high-frequency signals and causing the electromagnetic waves to interfere on the tags; and

    controlling a phase difference between the high-frequency signals in accordance with the position of a tag from which information is read.

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