Design Of Rectifying Circuit With Improved RF-DC Conversion For RF Wireless Power Transfer

Chan, Chun Yew (2015) Design Of Rectifying Circuit With Improved RF-DC Conversion For RF Wireless Power Transfer. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Energy harvesting system is a system that able to generate power from the ambient sources such as Radio Frequency (RF), solar, wind, motional, thermoelectric, and piezoelectric. As the demand for power increased, energy harvesting system is found to be one of the methods that can be applied. Thus, a rectifying circuit for RF energy harvesting system was introduced. A single stage and double stage rectifying circuit are designed, simulated, fabricated and measured in this study by using the Agilent Advanced Design System (ADS) 2011. Simulation and measurement were carried out for various input power levels at frequency 2.45 GHz. An experimental study had been carried out by varying the load of the rectifying circuit, R. Voltage regulator circuit LP2951 is connected to the rectifying circuit in order to produce a stable regulated output voltage. An input power of 15dBm, the system managed to produce 3.838V for single stage rectifying circuit and 7.812V for the double stage rectifying circuit. When rectifying circuit connected with a voltage regulator circuit, whole system is able to produce 4.038V regulated output voltage at 20dBm for single stage and 4.07V regulated output voltage at 20dBm for double stage. From the measured output voltage result, the maximum efficiency is 8% for single stage rectifying circuit and 33% for the double stage rectifying circuit. The design of rectifying circuit can be used to run low power device such as emergence relief and temperature sensor. The rectifying circuit also can be used to charge up mobile phone.

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