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RFID tags combining signals received from multiple RF ports

  • US 20070216533A1
  • Filed: 05/15/2007
  • Published: 09/20/2007
  • Est. Priority Date: 03/31/2004
  • Status: Active Grant
First Claim
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1. A circuit for use in an RFID tag, comprising:

  • a first RF port configured to receive a first signal (first received signal);

    a second RF port configured to receive a second signal (second received signal);

    a signal combiner for generating a combined signal from the first received signal and the second received signal, the signal combiner including a first envelope detector configured to generate a first processed signal from the first received signal, a second envelope detector configured to generate a second processed signal from the second received signal, and an adder configured to generate the combined signal from the first processed signal and the second processed signal; and

    an analog to digital converter for generating a digital signal from the combined signal.

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