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Frontiers of Information Technology & Electronic Engineering
ISSN 2095-9184 (print), ISSN 2095-9230 (online)
2020 Vol.21 No.3 P.366-376
Mutual coupling reduction of multiple antenna systems
Abstract: A multi-band multi-antenna system has become an important trend in the development of mobile communication systems. However, strong mutual coupling tends to occur between antenna elements with a small space, distorting array antennas’ performance. Therefore, in the multiple-input multiple-output (MIMO) antenna system, high isolation based on miniaturization of the antenna array has been pursued. We study in depth the methods of decoupling between antenna elements. Reasons for the existence of mutual coupling and advantages of mutual coupling reduction are analyzed. Then the decoupling methods proposed in recent works are compared and analyzed. Finally, we propose a metasurface consisting of double-layer short wires, which can be applied to improve the port isolation of antennas arranged along the H-plane and E-plane. Results show that the proposed metasurface has good decoupling effect on a closely placed antenna array.
Key words: Mutual coupling, Multiple-input multiple-output, Antenna array, Metasurface, Decoupling
1西安电子科技大学天线与微波技术重点实验室，中国西安市，710071
2深圳大学信息工程学院，广东省移动终端微波毫米波天线工程技术研究中心，中国深圳市，518060
摘要：多频带多天线系统已成为移动通信系统发展的重要趋势。但是，由于空间较小，天线单元之间往往会发生较强互耦，从而损坏阵列天线的性能。因此，在多输入多输出（MIMO）天线系统中，人们一直追求在天线阵列小型化的基础上，实现较高的隔离度。本文深入研究天线单元间的去耦方法，分析互耦原因及耦合减少的优势。然后，比较分析近期提出的解耦方法。最后，提出由双层短截线组成的超表面结构，以改善沿H面和E面排列的天线的端口隔离。结果表明，所提超表面对紧密放置的天线阵列具有良好去耦效果。
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DOI:
10.1631/FITEE.1900490
CLC number:
TN82
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On-line Access:
2020-03-18
Received:
2019-09-11
Revision Accepted:
2019-12-27
Crosschecked:
2020-02-24