Self tuning RFID tags

  • US 8,952,792 B1
  • Filed: 01/06/2012
  • Issued: 02/10/2015
  • Est. Priority Date: 01/07/2011
  • Status: Active Grant
First Claim
Patent Images

1. A Radio Frequency Identification (RFID) tag, comprising:

  • an antenna;

    a variable impedance; and

    an integrated circuit (IC) including a tuning circuit coupled to the variable impedance, the IC requiring a sufficient power to operate according to a protocol (SPOI), the tuning circuit requiring a sufficient power to tune the variable impedance (SPTT), the SPOI greater than the SPTT, wherein the IC is configured to;

    extract, before tuning the variable impedance, a first power from an RF wave incident on the antenna greater than the SPTT but less than the SPOI;

    tune the variable impedance to increase an efficiency of power extraction;

    extract, after tuning the variable impedance, a second power from the RF wave incident on the antenna greater than the SPOI; and

    operate according to the protocol after tuning the variable impedance.

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