Abstract
A 915 MHz GaN HEMT-based class-E rectifier is proposed in this paper to be used for DC+AC wireless power recovery. Taking advantage of the time reversal (TR) duality principle, the rectifier was derived from a class-E inverter, whose output network was designed for high-efficiency operation over a wide range of resistive loads. The addition of an appropriate gateside termination allows the device to be turned-on without an additional RF source for gate driving. The rectifier reduced sensitivity to load variation, as well as its capability for efficiently and linearly recovering the envelope of an AM RF excitation, were then characterized. An average efficiency of 82% has been measured for the combined RF-to-DC and RF-to-AC power conversion of a 1.6 W modulated carrier. Frequency multiplexing and frequency modulation alternatives for high-level DC+AC wireless power transmission are finally presented.
Highlights
Far-field wireless power transmission (WPT) links are conceived for the remote recovery of DC power, mainly motivated by the increased interest on powering wireless sensors, RFID tags, or many other DC loads requiring low voltage and current levels
If considering that fast switching Schottky diodes with high voltage and current capability are rarely available at the 915 MHz, 2.45 GHz or 5.8 GHz ISM frequency bands, those rectifiers could only deliver low levels to the DC and AC loads
Taking advantage of the time reversal duality principle [5], a rectifier with reduced sensitivity to load variation was derived from a class-E power amplifier (PA), designed for maximum efficiency under load modulating conditions
Summary
Far-field wireless power transmission (WPT) links are conceived for the remote recovery of DC power, mainly motivated by the increased interest on powering wireless sensors, RFID tags, or many other DC loads requiring low voltage and current levels. The use of diode-based rectifiers in the receiving side imposes a relevant limitation for high power recovery. If considering that fast switching Schottky diodes with high voltage and current capability are rarely available at the 915 MHz, 2.45 GHz or 5.8 GHz ISM frequency bands, those rectifiers could only deliver low levels to the DC and AC loads (a few tens of milliwatts according to the device and levels reported in [2]). Besides validating its capability for DC and AC power recovery at a few watts, alternatives to the AM/polarization multiplexing technique in [2] are tested
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
