| Summary: | 碩士 === 國立臺北科技大學 === 電腦與通訊研究所 === 100 === Two critical components are proposed for a wireless charging system of mobile handset, i.e. a metamaterial cavity using artificial magnetic conductor surfaces and a RF rectifier with high-power and high-effieency characteristics.
This wireless charging system demonstrates broad bandwidth, small size, long transmitting range, high transferring efficiency and EMI-free features.
To overcome the low breakdown voltage limit of silicon-based schottky diode, the series and parallel dividing transformers are employed to couple the high input RF power from single-ended into four differential-type bridge diodes. The proposed rectifiers are developed to withstand up to 36 dBm of input power before reaching the breakdown limit of Schottky diode, and their corresponding RF-to-DC power conversion efficiency is 59 % and 73% at operating frequency 920 MHz and the load resistance is 10 Ω.
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