MIMO系统是通过不同的分集技术,以实现在相同带宽和发射功率的条件下大幅改善系统容量和可靠性,减小信道失真.作为系统关键模块之一的天线,则要求有着好的分集特性,并接收较多的达波.这里提出的MIMO天线工作在2.4 GHz,天线单元是等边三角形贴片天线.三角形天线的宽波瓣可以使MIMO天线接收更丰富的多径达波,与天线单元的高增益相结合能较好改善MIMO系统的SNR和抗干扰能力.通过对天线端口间的互耦和相关性分析,该系统能实现好的极化和方向图分集,获得高的分集增益.%By means of diversity techniques, MIMO systems can improve the channel capacity and reliability of communication systems, and reduce channel distortion, without increasing transmitted power and bandwidth. An antenna, as a key module in MIMO system, is required to have good diversity to receive multipath signals. The MIMO antenna presented in this paper works in 2. 4 GHz. It has three equilateral triangular microstrip patches as its elements. The wide lobe characteristics of the triangular patch antenna can make MIMO system to receive more multipath waves. In combination with the high gain of each antenna element, it can improve the SNR and anti-jamming capability of the MIMO system. The mutual coupling and correlation analysis on each antenna port show that the antenna can achieve good polarization and directional pattern diversity, thus a high diversity gain can also be achieved.
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