A Wireless Power Transmission System Using Metamaterial Cavity and Its Key Components Design

• Main Authors: Ming-Lung Lee, 李明龍
• Other Authors: 毛紹綱
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/saad55

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.