基于模式抵消法的耦合环集成MIMO天线

Integrated Coupled-Loop MIMO Antenna Based on Mode Cancellation Method

针对移动终端设备中MIMO天线尺寸受限的问题,文中基于模式抵消法提出了一种耦合环结构的集成MIMO天线。在传统环天线结构中增加断点以调节共模频率使其与差模频率匹配,从而实现集成环天线的自解耦,无需任何额外的解耦结构。仿真和测试结果表明,该耦合环集成MIMO天线的-6 dB阻抗带宽为3.3~5.0 GHz,隔离度大于10 dB,天线的测试效率为52%~74%,包络相关系数(ECC)<0.15。此外,文中还进一步讨论了将该天线应用于实际的5G移动终端设备中。相比于已有研究,该设计具有结构简单、无需额外解耦结构、宽带等性能优势,具有较大的工业应用前景。

To overcome the size limitation issue of the MIMO antenna in mobile devices,an integrated coupled-loop MIMO antenna is designed in this paper based on the mode cancellation method.By cutting two break points in the conventional loop antenna,the resonant frequency of the common mode and differential mode can be matched to realize a novel self-decoupling performance without using any extra decoupling structure.The simulated and measured results indicate that the-6 dB impedance bandwidth of the proposed antenna is 3.3~5.0 GHz,in which the isolation is better than 10 dB.The measured antenna efficiency is 52%~74%and ECC is less than 0.15.Moreover,the application of the antenna in practical 5 G mobile devices is discussed.Compared to previous studies,the proposed MIMO antenna design scheme possesses the merits of simple structure,no extra decoupling structure and wideband,which shows great potential for the industry applications.