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Technologies for microwave power transmission to small mobile equipment at 5.8 GHz are presented, including GaN Schottky barrier diode (SBD) for efficient and high power RF/DC conversion, rectenna circuits with voltage doubler pair to reduce signal reflection, and frequency modulation to control efficient charging condition in a microwave cavity box.
Comparing circuit simulation results, an analytical model for the efficiency of single shunt rectenna circuits is developed. The model estimates the DC output power and loss power in rectenna circuits and gives good agreements with circuit simulation results. With this model, the effect of signal frequency and the diode capacitance is clarified.
Open-ring resonator coupling is used for the wireless power transmission through 1.6mm thick epoxy-glass plate. Microwave signal is emitted from one circuit board where an open-ring resonator is placed and the signal is received by another board with also an open-ring resonator and GaN Schottky barrier diode. At 2.3 GHz, RF to DC conversion efficiency of 37.1 % is obtained at the input power of 3...
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