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Passive response communication system

  • US 20030043023A1
  • Filed: 08/27/2002
  • Published: 03/06/2003
  • Est. Priority Date: 08/30/2001
  • Status: Active Grant
First Claim
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1. A method of passive response communication in which a first transponder transmits an interrogation signal to a remote second transponder, which responds by transmitting data back to the first transponder, the two transponders each comprising a transmitter and a receiver, and a communication signal exchanged between said transponders in at least one direction including a plurality of pulses, wherein at least one edge of at least one distinguishing pulse selected among said plurality of pulses has a rate of change different from the rate of change of a corresponding edge of at least another of said plurality of pulses so as to confer a distinctive shape on said distinguishing pulse and the receiver of said communication signal is selectively responsive to the shapes of said plurality of pulses.

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