A novel variable band gap center frequency and dual band gap stacked electromagnetic band gap (VBS-EBG) structure for multiple input multiple output (MIMO) antenna system used for the fifth-generation (5G) technology is presented in this paper. Proposed VBS-EBG is mathematically analyzed using transmission line model. Variation in band gap center frequency of VBS-EBG is simulated using eigenmode solution of high frequency structure simulator (HFSS) for different air gap and experimentally validated. It is observed from simulated and experimental results that proposed VBS-EBG gives more than 29.2 % and 39.13 % broader variation in first band gap and second band gap center frequency respectively, compared to reported variable band gap center frequency EBG structures. Application of the proposed EBG structure to reduced the mutual coupling of MIMO antenna system is carried out. 16.16 dB and 6.05 dB reduction in mutual coupling is observed at first and second resonance respectively of MIMO antenna with proposed EBG structure.

本文提出了一种用于第五代 (5G) 技术的多输入多输出 (MIMO) 天线系统的新型可变带隙中心频率和双带隙堆叠电磁带隙 (VBS-EBG) 结构。使用传输线模型对建议的 VBS-EBG 进行数学分析。VBS-EBG 带隙中心频率的变化使用高频结构模拟器 (HFSS) 的本征模解对不同气隙进行模拟，并经过实验验证。从模拟和实验结果中观察到，与报告的可变带隙中心频率 EBG 结构相比，所提出的 VBS-EBG 分别在第一带隙和第二带隙中心频率中提供了超过 29.2% 和 39.13% 的更宽变化。应用所提出的 EBG 结构来减少 MIMO 天线系统的相互耦合。在具有建议的 EBG 结构的 MIMO 天线的第一次和第二次谐振处分别观察到 16.16 dB 和 6.05 dB 的互耦合减少。