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Rectifying circuit for multiband radio frequency (RF) energy harvesting

  • US 9,871,298 B2
  • Filed: 12/23/2014
  • Issued: 01/16/2018
  • Est. Priority Date: 12/23/2014
  • Status: Active Grant
First Claim
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1. A radio frequency (RF) energy harvesting device comprising:

  • an antenna including a first antenna end point, a second antenna end point, and at least one elongated conductive structure connected to the first and second antenna end points and configured to resonate at RF frequencies within an associated bandwidth;

    a first RF signal is generated on the first antenna end point, and a second RF signal is generated on the second antenna end point, the second RF signal being 180°

    out-of-phase with the first RF signal; and

    a rectifying circuit including;

    a first diode coupled between the first antenna end point and a first node;

    a first capacitor coupled between the second antenna end point and the first node; and

    a second diode coupled between the first node and a second node,wherein the first diode has a lower forward voltage than the second diode, and the first diode has a lower peak inverse voltage than the second diode, whereby a first intermediate voltage generated at the first node comprises a sum of positive voltage pulses of the first RF signal that are passed through the first diode and the second AC signal passed through the first capacitor, and whereby a second intermediate voltage is generated at the second node in accordance with positive voltage pulses that are passed from the first node through the second diode.

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