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.

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Keywords Efficiency, Rectifier, Schottky diode, Wireless sensor network, WPT
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Journal Electronics
Almohaimeed, A.M. (Abdullah M.), Amaya, R, Lima, J.A. (Jose A.), & Yagoub, M.C.E. (Mustapha C. E.). (2018). An adaptive power harvester with active load modulation for highly efficient short/long range RF WPT applications. Electronics, 7(7). doi:10.3390/electronics7070125