Optimum Design Of Rectifier Circuit For RF Energy Harvesting

Sadeq Mohammed Hussein, Ali Al Mutamayez (2015) Optimum Design Of Rectifier Circuit For RF Energy Harvesting. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

The objective of this research is to propose novel circuit designs that enable RF to DC conversion for RF energy harvesting applications. Compared to other commonly observed alternative energy sources, such as solar and wind, RF harvesting can provide continuous supply of energy, and is not completely impaired by bad weather conditions and indoor use. However, obtaining a usable yield from this energy source is challenging as the amplitude of the arriving signals is considerably low. The contribution of this thesis goes beyond conceptual design alone, and has fabrication on a PCB to demonstrate how such a circuit can be used to charge mobile phones, tablets, and other low power devices. Results reveal approximately 100 % improvement over other existing commercialized designs in the power range of −20 to 20dBm. As increased demand for remote and disposable sensor, there is an increasing interest in battery-less systems use energy harvesters. Thus, an optimum design of rectifier circuit with Wilkinson power divider which has potential to be used for RF energy harvesting system was introduced. A Wilkinson power divider, single stage rectifier circuit, integration of single stage rectifier circuit with Wilkinson voltage combiner, and integration double stage rectifying circuit with Wilkinson power divider are designed, simulated, fabricated and measured in this study by using Agilent Advanced Design System (ADS) 2011. Simulation and measurement of rectifier circuit were carried out at various input power levels at frequency 2.45 GHz. At an incident signal of 16dBm, the system managed to produce an output DC voltage of 6.66 V, 6.65 V, 6.654 V and 13.54 V for single stage rectifier circuit, integrated circuit of single stage rectifier circuit with Wilkinson power combiner, and integrated of single and double stage rectifier circuit with Wilkinson power divider respectively.

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