Multiple-input multiple-output (MIMO) antennas have been a mainstream technology in fifth generation (5G) communications. However, strong mutual coupling between both adjacent and nonadjacent elements is inevitable, especially among highly integrated devices. In this paper, a slit embedded mushroom electromagnetic bandgap structure (EBG) is primarily proposed to suppress the propagation of surface wave between antenna elements. Subsequently, complementary split-ring resonators (CSRRs) are periodically arranged in two sides of the ground to steer the surface wave. By effectively utilizing the unusual electromagnetic property of EBG and CSRR to manipulate the propagation of surface wave, the mutual coupling between antenna elements has immensely alleviated. Finally, an H-shape defected ground structure (DGS) is introduced to reinforce decoupling effect. In order to validate the feasibility of the design principle, a prototype of the proposed antenna has been fabricated and measured. Measured results demonstrate that the decoupling concept in this paper is reasonable and approximately 12 dB reduction of mutual coupling is realized.

中文翻译：

---

通过控制表面波的传播增强 MIMO 天线隔离特性

多输入多输出 (MIMO) 天线已成为第五代 (5G) 通信的主流技术。然而，相邻和不相邻元件之间的强相互耦合是不可避免的，尤其是在高度集成的设备之间。在本文中，主要提出了一种狭缝嵌入蘑菇型电磁带隙结构（EBG）来抑制天线元件之间的表面波传播。随后，互补裂环谐振器 (CSRR) 周期性地布置在地面的两侧，以控制表面波。通过有效地利用 EBG 和 CSRR 的异常电磁特性来操纵面波的传播，天线元件之间的相互耦合得到了极大的缓解。最后，引入H形缺陷接地结构（DGS）以增强去耦效应。为了验证设计原理的可行性，已经制造和测量了所提出天线的原型。实测结果表明，本文中的去耦概念是合理的，实现了大约 12 dB 的互耦降低。