Design of High-Efficiency Voltage Doubler for Energy Harvesting Application

This paper focuses on a single-stage voltage doubler topology using two Schottky diodes, namely HSMS 280C. A single-stage voltage doubler is selected because the topology provides a sufficient DC voltage for powering a power management chip such as BQ25570 with input power starting with -5 dBm onwards. The Schottky diode is used due to its high junction capacitance, Cj of 1.6 pF. The rectifier is designed to operate in the industrial, scientific, and medical 868-MHz/915-MHz band. The maximum efficiency of 90.9 % and 78.11 % was obtained at 868 MHz and 915 MHz, respectively, using a load value of 200 Ω with a low input power of -5 dBm. The designed rectifier can be used as part of the receiver antenna's end side to form a rectenna. The rectifier has been studied and simulated using Advanced Design System and verified by using analytical equations. The same L-type impedance matching has been used throughout the study for consistency.