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Passive RF energy harvesting scheme for wireless sensor

  • US 8,552,597 B2
  • Filed: 03/27/2007
  • Issued: 10/08/2013
  • Est. Priority Date: 03/31/2006
  • Status: Active Grant
First Claim
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1. A method of passive radio frequency energy harvesting, the method comprising:

  • harvesting radio frequency energy using a crystal receiver;

    powering a processing unit only from the radio frequency energy being harvested when the radio frequency energy being harvested, or an indication of the amount of radio frequency energy being harvested, is above a threshold level;

    generating an interrupt signal to switch the processing unit to a low power mode when the radio frequency energy being harvested, or the indication of the amount of radio frequency energy being harvested, falls below the threshold level; and

    alternatively powering the processing unit only from an on-board power source when the radio frequency energy being harvested, or the indication of the amount of radio frequency energy being harvested, is below the threshold level.

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