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An Adaptive Power Harvester with Active Load Modulation for Highly Efficient Short/Long Range RF WPT Applications

School of Electrical Engineering and Computer Science, Ottawa University, Ottawa, ON K1N 6N5, Canada
Department of Electrical Engineering, Qassim University, Qassim 51431, Saudi Arabia
Department of Electronic, Carleton University, Ottawa, ON K1S 5B6, Canada
Author to whom correspondence should be addressed.
Electronics 2018, 7(7), 125;
Received: 31 May 2018 / Revised: 12 July 2018 / Accepted: 17 July 2018 / Published: 23 July 2018
(This article belongs to the Special Issue RFID, WPT and Energy Harvesting)
PDF [6545 KB, uploaded 23 July 2018]


After demonstrating, in previous works, the proof of concept of adaptive rectifiers with active load modulation to operate simultaneously for short/long range RF Wireless Power Transfer (WPT) while maintaining a high Power Conversion Efficiency (PCE), the authors introduced in this paper a power link budget of the proposed adaptive rectifier with a compromise between distance and efficiency. Then, to further exhibit its capabilities and enhance its performance, this paper first introduced a discussion about the parameters preventing the rectifier from operating over a wide range of input powers was performed. Furthermore, active load modulation was implemented and its co-simulation results presented. Finally, an adaptive rectifier was fabricated and its results successfully compared to measured data. It exhibits 40% of PCE over a wide dynamic input range of incident RF power levels from −6 to 25 dBm at the 900 MHz in the Industrial Scientific Medical band (ISM band), with a maximum PCE of 66% for an input power of 15 dBm. The proposed devices are therefore suitable for WPT applications to harvest energy from a controlled source. View Full-Text
Keywords: rectifier; schottky diode; efficiency; wireless sensor network; WPT rectifier; schottky diode; efficiency; wireless sensor network; WPT

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Almohaimeed, A.M.; Amaya, R.E.; Lima, J.A.; Yagoub, M.C.E. An Adaptive Power Harvester with Active Load Modulation for Highly Efficient Short/Long Range RF WPT Applications. Electronics 2018, 7, 125.

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