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Using 2.4 GHz load-side voltage standing waves to passively boost RF-DC voltage conversion in RF rectifier

Part of: Wireless Power Transfer in Space Applications

Published online by Cambridge University Press:  12 December 2019

Rushi Vyas Open the ORCID record for Rushi Vyas [Opens in a new window] ,
Sichong Li  and
Fadhel Ghannouchi
Rushi Vyas*
Affiliation:
Department of Electrical and Computer Engineering, University of Calgary, 2500 University Dr. NW, Calgary, AB T2N1N4, Canada
Sichong Li
Affiliation:
Department of Electrical and Computer Engineering, University of Calgary, 2500 University Dr. NW, Calgary, AB T2N1N4, Canada
Fadhel Ghannouchi
Affiliation:
Department of Electrical and Computer Engineering, University of Calgary, 2500 University Dr. NW, Calgary, AB T2N1N4, Canada
*
Author for correspondence: Rushi Vyas, E-mail: rushi.vyas@ucalgary.ca
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Abstract

A novel, dual-band, voltage-multiplying (RF-DC) rectifier circuit with load-tuned stages resulting in a 50 Ω input-impedance and high RF-DC conversion in 2.4 and 5.8 GHz bands for wireless energy-harvesting is presented. Its novelty is in the use of optimal-length transmission lines on the load side of the 4 half-wave rectifying stages within the two-stage voltage multiplier topology. Doing so boosts the rectifier's output voltage due to an induced standing-wave peak at each diode's input, and gives the rectifier a 50 Ω input-impedance without an external-matching-network in the 2.4 GHz band. Comparisons with other rectifiers show the proposed design achieving a higher DC output and better immunity to changing output loads for similar input power levels and load conditions. The second novelty of this rectifier is a tuned secondary feed that connects the rectifier's input to its second stage to give dual-band performance in the 5.8 GHz band. By tuning this feed such that the second stage and first stage reactances cancel, return-loss resonance in the 5.8 GHz band is achieved in addition to 2.4 GHz. Simulations and measurements of the design show RF-DC sensitivity of −7.2 and −3.7 dBm for 1.8V DC output, and better than 10 dB return-loss, in 2.4 and 5.8 GHz bands without requiring an external-matching-network.

Keywords

2.4 GHz5.8 GHzectifierRF-DC
Type
Research Article
Information
Wireless Power Transfer , Volume 6 , Issue 2 , September 2019 , pp. 113 - 125
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Copyright
Copyright © Cambridge University Press 2019

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