A reconfigurable class-F radio frequency voltage doubler from 650 MHz to 900 MHz for energy harvesting applications

Abstract

This paper presents a reconfigurable high efficiency, high output voltage, and multiband class-F radio frequency (RF) voltage doubler and two stages voltage doubler rectifiers for energy harvesting applications using RO4003C substrate. The proposed voltage-doubler circuits are suitable for multi-band LTE, IoT, WSN, UHF ISM 900 MHz, GSM 900, energy harvesting, and multi-standard applications. The voltage doubler circuits are implemented using the Schottky diode (HSMS2852). Also, the voltage-doubler circuits are optimized and refabricated to recompense the unwanted parasitic and achieve the required performance. The voltage doubler and two stages voltage doubler rectifiers have a measured efficiency exceeding 40% in the frequency band from 650 MHz to 900 MHz at −10dBm input power and a load resistance of 10kohm, 22kohm, and an output voltage of 1 V at −10dBm input power. The proposed class-F RF voltage doubler achieves maximum efficiency of 72%, saturated output voltage equals 3.5 V, and the efficiency equals 51% at −10dBm input power. On the other hand, the proposed class-F two stages RF voltage doubler has a peak efficiency of 54%, saturated output voltage equals 6.5 V at 4dBm input power, and the efficiency equal 38% at −10dBm input power. Finally, the PCB areas of the proposed voltage-doubler and two stages voltage-doubler equal 2.8cm2and 3.6 cm2, respectively.