Abstract
This letter presents a novel adaptive rectifier for wireless power transmission (WPT) applications. By utilizing a depletion-mode field-effect transistor (FET) switch, the configuration of the rectifier can automatically adapt to the input power level. Compared with traditional rectifiers, it can provide a consistent high RF-to-dc power conversion efficiency (PCE) over a significantly extended operating input power range. Measured results show that the PCE of this proposed adaptive rectifier keeps above 50% in the input power range spanning from -14 up to 21 dBm. Additionally, maximum PCE of more than 75% is achieved in the input power range from 5 to 15 dBm.
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