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METHOD AND SYSTEM TO CONTROL AMBIENT RF ENERGY FOR WIRELESS DEVICES

  • US 20130234536A1
  • Filed: 03/08/2012
  • Published: 09/12/2013
  • Est. Priority Date: 03/08/2012
  • Status: Active Grant
First Claim
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1. A method to control energy that is available for wireless power harvesting, the method comprising:

  • determining to increase radio-frequency (RF) energy available to power a wireless tag incorporating wireless power harvesting; and

    controlling the RF energy delivered to the wireless tag to provide tag energy, using one or more of;

    a) increasing transmission RF power of one or more wireless communication devices,b) increasing a duty cycle associated with wireless transmissions of one or more wireless communication devices, andc) decreasing path loss of the power to the wireless tag.d) varying the frequency or channel of operatione) varying the power spectral density (PSD) of the transmitted signal,f) transmitting on a subset of antennas from among a plurality of antennas.

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