互耦效应对天线阵单元间相关性的影响

分析了互耦效应对多天线性能的影响，通过网络等效分析法对天线模型进行简化分析，得出阻抗矩阵和收发端的耦合矩阵。推导出互耦效应时天线阵元空间相关性的通用表达式，并论证了它与无互耦时空间相关性的关系。研究了互耦效应分别对平行天线阵列和共线天线阵列阵元间空间相关性的影响。仿真分析表明，互耦效应对于两种天线阵列的影响显著不同，适当的选择天线阵列可以有效地改善互耦效应对于系统性能的影响。

Effects of mutual coupling on the spatial correlation between the elements of antenna array

In this paper, the impacts of mutual coupling on the performance of MIMO wireless channel are analyzed. From the analysis of the antenna model by network equivalent analysis, the impedance matrix and the mutual coupling matrices of transmitter and receiver are obtained. A general expression of the spatial correlation between a pair of mutually coupled antennas is explicitly derived, and the conditions under which mutual coupling has no effect on the spatial correlation are also identified. The effects of mutual coupling on the parallel antenna array and the collinear antenna array are investigated. Simulation results show that the impacts of mutual coupling on parallel antenna array and collinear antenna array are quite different in the performance of MIMO channel, and the performance of MIMO system affected by mutual coupling can be improved effectively by properly selecting antenna array.