Multi-band radio frequency energy harvesting

In parallel with the great increase in the use of wireless communication devices such as mobile phones and Wi-Fi, the presence of electromagnetic waves in the environment has increased significantly. The phenomenon of collecting this small amount of energy in the environment called energy harvesting and converting it into usable electrical energy has recently attracted great interest. The biggest factor in this interest is the widespread use of low-power devices and their constant need for energy. This need has brought about an increase in low-power energy acquisition studies. In this thesis, a multi-band RF energy harvesting circuit is designed. The output voltage and efficiency of the system built at 900 MHz, 1800 MHz and 2450 MHz frequencies have been demonstrated. All simulations in this thesis were made using the ADS (Advance Design System) 2017 program. Firstly, the multi-stage DVM (Dickson Voltage Multiplier), ranging from two to twelve stages, was designed. The load resistances giving the maximum power for each frequency were determined and a common load suitable for all three frequencies was selected. Then, LC, LL and π type impedance matching circuits were applied to these circuits in order to obtain maximum output power in multi-stage DVM design with two Schottky diode models (HSMS-2852) from two stages to six stages. The number of steps giving the maximum output power for each frequency is determined for each matching type. These three circuits with the number of steps obtained at the frequencies 900 MHz, 1800 MHz and 2450 MHz are combined for each matching type. The output voltage and efficiency of the resulting system were analyzed for each matching type.