A Simple High-Efficiency Rectifier for Low Power Harvesting

This paper reports a simple rectifier featuring a relatively high efficiency in connection with low input power. The measured RF-DC conversion efficiency reaches 30% at -20 dBm input power level, which, to the best knowledge of the authors, represents the highest record among all the reported works so far for this power range. The Bode-Fano criterion is employed to achieve the high energy conversion efficiency. Such rectifiers are especially useful for wire-less energy harvesting.