X型极化分集系统中天线互耦效应分析  

Antenna mutual coupling effect in X-type polarization diversity system

作　　者：李岳衡[1,2] 赵静[1] 

机构地区：[1]河海大学计算机与信息学院,江苏南京210098 [2]东南大学移动通信国家重点实验室,江苏南京210096

出　　处：《电波科学学报》2011年第3期567-573,共7页Chinese Journal of Radio Science

基　　金：江苏省自然科学基金(BK2008358)资助项目;东南大学移动通信国家重点实验室开放研究基金资助课题

摘　　要：极化分集系统的分集增益性能受天线阵元间互耦因素的影响很大。为了探究存在互耦效应时天线分集增益与阵列夹角之间的关系,首先基于天线基本理论,推导出X型极化分集阵列互耦阻抗、空域相关性以及平均功率比等参数的显性数学表达式,并据此详细研究存在阵列耦合时,X型极化分集系统分集增益性能随阵列排布夹角而改变的变化趋势。理论分析与计算机数值仿真结果皆表明:引入阵列互耦效应后,X型极化分集阵列的分集增益性能优于不计互耦效应时的阵元夹角范围,将随着交叉极化鉴别度的增大而增大。鉴于实际通信环境大多处于较高交叉极化鉴别度值的情形,故此研究结果可为多输入多输出(MIMO)系统小型化设计提供重要的理论及数值分析参考。The diversity gain of an X-type polarization diversity system is heavily affected by mutual coupling （MC） effect. In order to study the relationship between the antenna diversity gain and the cross-angle of X-type antenna array in the presence of MC, the mathematical expressions of mutual impedance, spatial correlation and average receive power ratio for X-type antenna array are derived firstly based on basic antenna theory;then the polarization diversity gain changing with the crossangle of X-type antenna array is analyzed indetail through the above derivations. Both theoretical analysis and numerical simulations show that the range of the cross-angle formed by the X-type antenna layout to guarantee the final diversity gain with MC over that without MC increases with the increment of the cross polar- ization discrimination （XPD） of the incident waves. Due to higher XPD level in actual communication environment, the research results are quite valuable for compact MIMO system design.

关 键 词：极化分集 阵列互耦 阵列相关 平均功率比 极化系统增益 

分 类 号：TN911.2[电子电信—通信与信息系统]