中文摘要：

为研究双反射面信道中多径丰富程度对6极化多输入多输出系统（HPMI-MO）信道容量和特征值的影响，设计了一个工作于28GHz的共点正交的双极化天线，此天线由一个电偶极子和一个环天线组成，并以此天线为基本单元，得到了一个虚拟的共点正交6极化MIMO天线．从计算结果中发现，随着两个反射面间夹角的减小，信道中的多径数目逐渐增加，对应的信道容量也逐渐增加，可达到单极化系统信道容量的2．47～5．10倍．夹角为0°时多径数目趋于无穷的情况比自由空间（Fs）和夹角为180°等多径较少的情况下的6极化MIMO信道容量会有30％～45％的增加．此外，在自由空间信道和双反射面信道中，6极化MIMO信道矩阵都会得到6个非零特征值，但在多径数目较少时，有一些特征值会接近于0°因此，为了获得足够高的信道复用和分集增益，多极化MIMO天线需要工作在多径较为丰富的信道中．

英文摘要：

To study the effect of multipath richness in the two-mirror channel on the characteristics of the hexapolarized multiple-input multiple-output （HPMIMO） channel, a co-located and orthogonal dual-polarized antenna was designed, composed of an electric dipole and an electric loop working at 28 GHz, based on which a virtual HPMIMO antenna was constructed. From the computation results, it is seen that with the reduction of the angle between the two reflection planes, the richness of the multipath increases gradually, and the capacity gain of the HPMIMO channel over the single-polarized channel gets large correspondingly, which can achieve 2.47 - 5.10. If the angle between the two planes is 0~, the capacity of the HPMIMO in the two-mirror chan- nel is larger than that in the free space （FS） and other channel with little muhipath by 30% -45%. Further- more, in both of the FS channel and the two-mirror channel, the HPMIMO channel matrix can obtain 6 non- zero eigenvalues, but some of them are very small and may approach zero if the multipath are not sufficiently rich. Thus, in order to get a high multiplexing and diversity gain, the multl-polarized MIMO antenna should be used in a rich multipath environment.