| Summary: | 碩士 === 國立臺北科技大學 === 電腦與通訊研究所 === 100 === This thesis proposes operating at 2.45GHz microwave frequency band high-efficiency rectifier circuit, which has the advantages of small, low-cost, material easy to obtain and etc. The rectifier circuit design uses nonlinear RF Schottky diode, microstrip transmission line impedance conversion principle, with the use of microstrip circuit to achieve low-pass filter and matching network functions. We use preliminary design of the rectifier circuit simulated on Agilent ADS 2009 as the practical circuit, and high-frequency signal is rectified into DC power by this circuit. As for the receiving antenna, we use Ansoft HFSS 11 to do the simulation for the high-directivity microstrip 2 x 2 antenna array, and as the reference of the practical receiving antenna. The proposed rectenna (integration of rectifier and array antenna) architecture is to achieve the 2.45GHz microwave power transmission applications. The realized 2 x 2 microstrip array antenna directivity is up to 12.49dBi; the realized LPF has been fed to high-efficiency rectifier circuit with fixed load 390Ohm to achieve the circuit conversion efficiency of 76.2% and the output voltage of up to 5.45 V when input power is 100mW. The 2x2 array rectenna could achieve the best conversion efficiency of 87.8% and the output voltage of 1.28V with the distance of 1.4 meter with the transmitter when the input power of transmitter is 316mW.
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