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Sensors 2017, 17(3), 546; doi:10.3390/s17030546

Enhanced Passive RF-DC Converter Circuit Efficiency for Low RF Energy Harvesting

1
Chair of Measurement and Sensor Technology, Technische Universität Chemnitz, 09126 Chemnitz, Germany
2
National Engineering School of Sfax, University of Sfax, Sfax 3038, Tunisia
3
National School of Electronic and Telecommunication (ENET’Com), Sfax 3018, Tunisia
*
Author to whom correspondence should be addressed.
Academic Editor: Davide Brunelli
Received: 9 January 2017 / Revised: 3 March 2017 / Accepted: 6 March 2017 / Published: 9 March 2017
(This article belongs to the Special Issue Energy Harvesting Sensors for Long Term Applications in the IoT Era)
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Abstract

For radio frequency energy transmission, the conversion efficiency of the receiver is decisive not only for reducing sending power, but also for enabling energy transmission over long and variable distances. In this contribution, we present a passive RF-DC converter for energy harvesting at ultra-low input power at 868 MHz. The novel converter consists of a reactive matching circuit and a combined voltage multiplier and rectifier. The stored energy in the input inductor and capacitance, during the negative wave, is conveyed to the output capacitance during the positive one. Although Dickson and Villard topologies have principally comparable efficiency for multi-stage voltage multipliers, the Dickson topology reaches a better efficiency within the novel ultra-low input power converter concept. At the output stage, a low-pass filter is introduced to reduce ripple at high frequencies in order to realize a stable DC signal. The proposed rectifier enables harvesting energy at even a low input power from −40 dBm for a resistive load of 50 kΩ. It realizes a significant improvement in comparison with state of the art solutions. View Full-Text
Keywords: radio frequency energy transmission; RF-DC Converter; rectifier; power efficiency; voltage multiplier; Villard topology; Dickson topology radio frequency energy transmission; RF-DC Converter; rectifier; power efficiency; voltage multiplier; Villard topology; Dickson topology
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Chaour, I.; Fakhfakh, A.; Kanoun, O. Enhanced Passive RF-DC Converter Circuit Efficiency for Low RF Energy Harvesting. Sensors 2017, 17, 546.

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