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Numerous studies have been carried out on the wireless power transmission (WPT) technologies, which transfers power to the electrical loads without man-made wires. As one mean of WPT, microwave power transmission (MPT) has attracted lots of attention due to its long-distance power transmission capability. A notable problem among these technologies is that the RF to DC conversion efficiency could be easily affected by the load resistance and the input power. Therefore, an impedance matching circuit becomes crucial to realize the wireless power transmission with high efficiency. Moreover, most of the impedance matching circuits in microwave circuits utilize distributed-constant circuits, whereas, the rectenna is a special distributed-constant circuit yielding a DC output. This present thesis aims at developing an ultra-wide load range rectenna for microwave power transmission and a resistance matching circuit from the viewpoint of DC, which is easy to design since it is unnecessary to consider high harmonics. Different from the conventional DC-DC converters used for voltage conversion, in the present thesis, a resistance conversion DC-DC converter is proposed and validated in the following procedures: Firstly, with aid of the simulator of advanced design system (ADS), a common pulse-width modulation (PWM) controlled boost converter is checked as an impedance matching circuit for rectifying circuit. For the validation a simulation model of RF-DC-DC circuit is built which consists of a simple single shunt rectifying circuit and the boost converter. The simulation results show that the overall efficiency of the RF-DC-DC circuit is almost constant over 70% in the load range from 370 to 1300 Ω. Moreover, it is also found that the boost converter can prevent the reverse voltage applied on the rectifying diode from exceeding breakdown voltage and then the rectifying circuit can keep acting at the peak efficiency point. However, this PWM controlled boost converter can only convert

Development of a Rectenna Adapted to Ultra-wide Load Range for Microwave Power Transmission