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Dual mode transmitter-receiver and decoder for RF transponder tags

  • US 6,433,671 B1
  • Filed: 08/18/2000
  • Issued: 08/13/2002
  • Est. Priority Date: 11/29/1996
  • Status: Expired due to Fees
First Claim
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1. A dual mode tag identification system, comprising a radio frequency interrogation signal source, a radio frequency receiver and an analyzer, in which a reradiated modified representation of an interrogation signal from the interrogation signal source is analyzed to determine a data transmission mode, being responsive to respective first and second modes having respectively different formats of a time sequence of characteristic identifying modulation states imposed on said interrogation signal.

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