中文摘要：

针对磁耦合谐振式无线输电（WPT）系统在中距离传输时,传输效率随着传输距离增加而显著下降的问题,首先建立了关于磁耦合谐振式WPT系统的二端口网络模型,然后将反L型阻抗匹配网络嵌入系统中,根据最大传输功率理论,定量分析了阻抗匹配电路的调节电容,通过调节匹配电容的值,使系统在中距离传输时的效率得到明显提高。最后开发了相应的实验装置,验证了理论分析的正确性。

英文摘要：

In order to solve the problem of apparently decreased transmission efficiency at medium transmission due to the increase of transmission distance for wireless power transmission（WPT） system via magnetic resonance coupling.A two-port network model is established and the converse L-type matching network is embedded in the system.According to the theory of maximum transmission power, quantitative analysis of adjusting capacitors of impedance matching circuit is performed.The system efficiency is improved significantly by adjusting the values of matching capacitors at medium transmission.Finally, a corresponding experimental device is developed and the theory is improved by the experiments.