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多输入多输出(MIMO)无线通信系统已经成为提高通信系统可靠性和数据传输速率的有效技术。MIMO通信系统中,终端天线的性能对系统通信容量的提升至关重要。为了提高天线端口隔离度,提出了一种在微带天线辐射贴片上加载缝隙阵列实现天线极化分集,提高天线隔离度的方法,并且将这种方法应用于两个2单元微带MIMO天线设计中,取得了良好的效果。缝隙阵列加载不但抑制了微带MIMO天线单元间的耦合,而且产生了更多谐振频点,改善了高频谐振频点畸变的天线辐射方向图,并且天线尺寸也得到了很大的减缩。最后对比分析了设计的两个微带MIMO天线,实测结果与仿真计算比较可知,在工作带宽内,单元天线间耦合得到了非常有效的抑制。这种在平面天线辐射贴片加载缝隙阵列改变天线极化方向的技术可以很好地用来抑制多天线系统中单元天线间的耦合,而且对天线的其他性能不会造成影响。
Multiple Input Multiple Output (MIMO) wireless communication systems have become an effective technique to improve the reliability and data transmission rates of communication systems. In the MIMO communication system, the performance of the terminal antenna is crucial to improve the communication capacity of the system. In order to improve the isolation of the antenna port, a method of loading the slot array on the patch of the microstrip antenna to realize polarization diversity of the antenna and improve the isolation of the antenna is proposed. The method is applied to two 2-cell microstrip MIMO antennas Design, has achieved good results. The slot array loading not only restrains the coupling between the microstrip MIMO antenna elements, but also produces more resonance frequencies, improves the antenna radiation pattern of the high-frequency resonance distortion, and greatly reduces the antenna size. Finally, the two microstrip MIMO antennas are compared and analyzed. Compared with the simulation results, we can see that within the working bandwidth, the coupling between the unit antennas is very effectively suppressed. This technique of loading a slot array on a planar antenna to change the polarization direction of the antenna array can be well used to suppress the coupling between the unit antennas in a multi-antenna system without affecting the other antenna performance.