中文摘要：

建立了X型极化分集系统的互耦分析模型，综合考虑了天线与电路两部分互耦对系统性能的影响．给出极化分集系统信号的相关系数表达式，能够更全面地分析互耦对X型极化分集系统中信号相关系数、信道平均接收功率比和系统极化分集增益的影响．分析表明系统耦合虽然会提高信号的相关性，但同时也可以降低信道平均接收功率比，从而提高系统的极化分集增益．指出交叉极化鉴别度对系统相关系数和信道平均接收功率比影响显著，而且交叉极化鉴别度越大，系统极化分集增益越小．

英文摘要：

A useful model for analyzing mutual coupling （MC） of the X-type polarization diversity system is put forward. The effects of MC in both antennas and circuits on the performance of the system are investigated. The expression for the correlation coefficient for the polarization diversity system is obtained. Therefore the effects of MC on the signal correlation coefficient, mean power ratio and system polarization diversity gain can be investigated more comprehensively. It is concluded that MC could raise correlation but also decrease the mean power difference, thus improving the diversity gain. In addition, the dominant effects of Cross Polarization Discrimination （XPD） on the signal correlation coefficient and mean power ratio of system are illustrated. It is shown that the larger the XPD, the lower the polarization diversity gain will be.