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Powering devices using RF energy harvesting

  • US 9,021,277 B2
  • Filed: 12/30/2013
  • Issued: 04/28/2015
  • Est. Priority Date: 06/08/2005
  • Status: Active Grant
First Claim
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1. An apparatus, comprising:

  • a first antenna configured to wirelessly receive energy from a source that is remote from the apparatus and in a far-field region of the first antenna and a second antenna;

    the second antenna different from and electrically isolated from the first antenna, the second antenna configured to wirelessly communicate with the source;

    a power harvester electrically coupled to the first antenna and configured to convert the energy received at the first antenna to a DC voltage;

    a radio-frequency identification (RFID) device electrically coupled to the power harvester and to the second antenna, the RFID device configured to wirelessly communicate with the source via the second antenna;

    an integrated circuit configured to operate based on the DC voltage; and

    a sensor electrically coupled to the integrated circuit, the sensor configured to operate based on the DC voltage and to detect at least one of an environmental condition associated with a location of the apparatus or a physical condition associated with an item coupled to the apparatus.

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