中文摘要：

针对地下无线传感器网络中通信效率低、接收点有用信号弱的现状,基于磁感应原理,以磁通信电路模型的建立为切入点,运用互感理论,推导出负载功率、路径损耗和传输效率的表达式,通过理论分析,得到路径损耗以及传输效率分别与天线参数、工作频率、通信距离的具体关系。试验仿真结果表明：通过改变工作频率和天线参数可以弥补实际通信距离的需要,提高通信质量,为地下无线传感网络的应用提供参考。

英文摘要：

For situations that low communication efficiency and weak useful signal on the receiving point were faced by wireless underground sensor networks（WUSNs）,according to magnetic induction principle,establish of magnetic communication circuit model was as the entry point,then,the expressions of load power,path loss and transmission efficiency were deduced based on mutual induction theory.Moreover,relations among path loss,transmission efficiency,antenna parameter,working frequency and communication distance were obtained.Test simulation results prove that communication distance can be optimized by changing working frequency and antenna parameters,and communication quality can be improved,thus providing reference for the application of the underground wireless sensor network.