Mutual Coupling Reduction of a Closely Spaced Four-Element MIMO Antenna System Using Discrete Mushrooms
Mutual Coupling Reduction of a Closely Spaced Four-Element MIMO Antenna System Using Discrete Mushrooms
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DOI：
10.1109/tmtt.2016.2604314
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发表时间：
2016-09
影响因子：
4.3
通讯作者：
Guohua Zhai;Zhi Ning Chen;X. Qing
中科院分区：
文献类型：
--
作者：
Guohua Zhai;Zhi Ning Chen;X. Qing
本文提出了一种利用五个离散蘑菇形负载来减小密集四单元多输入多输出天线系统互耦的方法。负载的出现集中了基片集成背腔缝隙（SICBS）天线单元的部分近场，改变了各天线单元之间的近场分布，从而可以大大降低天线单元之间的互耦。设计了总尺寸为1.2λ0 × 1.2λ0 × 0.11λ0的加载四单元SICBS天线系统（λ0是2.4GHz处的自由空间波长）实现了沿着具有相同极化的对角线的天线元件之间的互耦合降低14 dB，同时在2.4- 2.485GHz的频带上保持正交放置的相邻元件的互耦合不变。在每个天线单元对之间的互耦低于-35dB的情况下，在2.4- 2.485GHz的工作带宽上，包络相关系数小于0.005。
A methodology of using five discrete mushroomlike loadings to reduce the mutual coupling of a closely spaced four-element multiple-input multiple-output antenna system is presented in this paper. The occurrence of the loadings concentrates part of the near fields of the substrate integrated cavity-backed slot (SICBS) antenna element and changes the near-field distribution between each antenna elements, so that the mutual coupling between the antenna elements can be greatly reduced. The loaded four-element SICBS antenna system with an overall size of 1.2λ0 × 1.2λ0 × 0.11λ0 (λ0 is the free-space wavelength at the 2.4 GHz) realizes the mutual coupling reduction of 14 dB between the antenna elements along the diagonal lines with identical polarization, while keeping the mutual coupling of the orthogonally placed adjacent elements unchanged over the band of 2.4-2.485 GHz. With the mutual coupling lower than -35 dB between each antenna element pair, the envelope correlation coefficient is less than 0.005 across the operating bandwidth of 2.4-2.485 GHz.