RFID communication system
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United States of America Patent
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Sep 27, 2016
Grant Date -
Oct 8, 2015
app pub date -
Nov 7, 2013
filing date -
Nov 7, 2012
priority date (Note) -
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Abstract
An RFID communication system comprises an interrogator including a signal generator for generating an interrogation signal at a predetermined frequency f0 and a first interrogator antenna for transmitting said interrogation signal and receiving a first reply signal at a frequency f0, and processing means, and a passive transponder including a first transponder antenna for transmitting said first rely signal and receiving said interrogation signal and a chip comprising nonlinear components for generating said first reply signal in response to the interrogation signal. The interrogator is arranged to receive a second reply signal whose frequency is a multiple of the predetermined frequency f0, said multiple being either odd or even, said second reply frequency being generated by the nonlinear components of the transponder chip, said first and second reply signals being processed by the processing means of the interrogator in order to complete or improve the functionality of the system.
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