Study of improving efficiency of receiver for microwave wireless power transmission system

• Main Authors: LIN,HE-JIN, 林合晉
• Other Authors: CHEN,JA-HAO
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/ftmj68

碩士 === 逢甲大學 === 通訊工程學系 === 106 === The methodology of improving the receiver efficiency of wireless power transmission system has been studied. Two parts of the circuit are used to improve the system efficiency. The first part is to design a high-gain antenna; the second part is to design a three-step boost rectifier circuit. In the first part of the research on high-gain antennas, four antennas were designed: a finger-meander antenna, a capacitive-load finger-meander antenna, a finger-meander antenna array, and a capacitive-load finger-meander antenna array. The highest gain antenna is the capacitive-load finger-meander antenna array, with a reflection loss of -20 dB, a gain of 7.74 dBi, and an area of 65.5 x 170 mm2. The second part is a boost rectifier circuit design. Using third-order boost rectifier circuit architecture and Schottky diodes with the low critical voltage of the body increases the conversion efficiency. The size of the implemented circuit is 30mm x 15mm, and the return loss is 21 dB at 2.4 GHz of the operation frequency. The highest efficiency is 40% with 10K ohms load. After system integration, the measured results show that the transmitter of the wireless power transmission system can provide 31 dBm output power at 2.4 GHz. It can turn on the LED lamp under a distance of 4.8 meters with the capacitive-load finger-meander antenna array and the boost rectifier circuit.