Compact and efficient wideband rectifier based on π network with wide input power ranges for energy harvesting

Abstract

This work introduces a wideband, significant RF-DC conversion efficiency and large DC voltage radio frequency (RF) voltagemultiplier/doubler rectifier for energy harvesting (EH) systems utilizing ROG4003C material and Schottky diode. The input matching network is designed using π network and series resonance circuit. Two wideband rectifiers are designed the first one uses lumped inductors in the π network, and the second design employs distributed rectangular inductors. The π network is connected in series with a Schottky diode to compensate its capacitive reactance, diminish its impedance variation when the frequency or input power varies while the series resonance circuit is used to match the minimized variance to the source impedance (50 Ω). An HSMS2852-based rectifier prototype is tested for verification, obtaining a bandwidth of 31.6 % from 720 to 1050 MHz with 68 ± 2 % at an input power of 3 dBm with a peak saturated DC voltage of 3.6 V and an input return loss (S11) less than −10 dB.The proposed rectifiers provide good performance over a wide input power range between −10 dBm and 5 dBm via various load terminals ranging from 2.5Kohms to 10Kohms. The proposed rectifier is suitable for GSM 900, IoT, UHF ISM 900 MHz, WSN, broadband LTE, and multi-standard systems. Finally, the introduced voltage doublers have a compacted area equal to 1.85 cm2.