Abstract
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.
Highlights
Nowadays, Wireless Power Transfer (WPT) and energy scavenging have been attracting researchers and industry due to the ever-growing need for flexible, sustainable, and unfailing sources of energy
Note that the system using the concept of an adaptive rectifier reaches an rectifier reaches an efficiency greater than 40% for distances up to 2 m and 49% of efficiency at 1 m
By including the active load, the circuit presents a higher co-simulated efficiency, over 40%, expected, by including the active load, the circuit presents a higher co-simulated efficiency, over 40%, and within a wider range of RF input power levels (−7 dBm to 32 dBm) compared to fixed loads
Summary
Wireless Power Transfer (WPT) and energy scavenging have been attracting researchers and industry due to the ever-growing need for flexible, sustainable, and unfailing sources of energy. In order to estimate the power levels that can be transmitted, received, and harvested as well as the maximum distance that can be reached, a power link budget is essential. (P , G ) and (P , G ) state, respectively, the transmitted and received where λ is the signal wavelength. (Ptt, Gtt) and (Prr , Grr ) state, respectively, the transmitted and received power and gain of antennas separated by a distance R. power and gain of antennas separated by a distance R. The applied transmitted power was set as of 36 dBm at the UHF ISM band. [7], and the Internet of Things (IoT) [8] Such applications applications can can involve involve aa wide wide range of power levels depending on the targeted applications and and the distance from the controlled source: RFID. Current (DC) to voltage either received by the receiving antenna,antenna, it will beitconverted to directto current voltage eitherto directly directlydevices power or devices or store theinenergy in batteries [3]
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