The purpose of this research was to design, simulate and optimize a 4-band radio frequency energy harvesting (RFEH) network circuit using the Keysight Technologies Advanced Design System (ADS) design and simulation software used for low power applications. The RF bands used for this study were Global System for Mobile Communication (GSM) (950MHz, 1850MHz, 2150MHz) and Wireless Fidelity (Wi- Fi) (5000MHz). Smith chart was employed to design the impedance matching circuit to match the source impedance (Zin) and the load impedance (Zload) to minimize the signal reflection (return loss) and maximize the power transfer. The impedances were matched at the desired radio frequency (RF) operating frequency. A single, two and three-stage voltage multipliers were simulated to obtain the output impedance at 4-band RF frequencies with the source impedance set to 50 ohms. Simulation results showed that the three-stage voltage multiplier produced the best outcomes, thus, was used for this.....

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