Multiple‐input‐multiple‐output (MIMO) array antenna integrated with the double negative metamaterial superstrate is presented. The triangular metamaterial unit cell is designed by combining two triangular elements positioned in complementary on the same plane at different sizes. Such design with more gaps is used to excite rooms for more capacitance effects to shift the resonance frequency thus enlarging the bandwidth of the MIMO antenna. The unit cell is arranged in 7 × 7 periodic array created a superstrate metamaterial plane where the C_stray exists in parallel between the two consecutive cells. It is found that the existence of C_stray and gaps for each unit cells significantly influenced the bandwidth of the MIMO antenna. The higher value of the capacitance will lead to the negativity of permittivity. The superstrate plane is then located on top of the 4 × 2 MIMO with a gap of 5 mm. The integration resulted in improving the bandwidth to 12.45% (5.65‐6.4GHz) compared to only 3.49% bandwidth (5.91‐6.12GHz) of the MIMO antenna itself. Moreover, the negative permeability characteristic is created by a strong magnetic field between the complementary unit cells to have 14.05‐dBi peak gain. Besides that, the proposed antenna managed to minimize the mutual coupling and improve the mean effective gain, envelope correlation coefficient, and multiplexing efficiency.

中文翻译：

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具有双重负超材料覆盖层的三角形MIMO阵列天线可增强带宽和增益

提出了与双负超材料覆盖层集成的多输入多输出（MIMO）阵列天线。三角形超材料单元格是通过组合两个互补放置在同一平面上的大小不同的三角形元素而设计的。具有更多间隙的这种设计用于激发空间以产生更多的电容效应，从而改变谐振频率，从而扩大MIMO天线的带宽。晶胞以7 × 7周期阵列排列，在两个连续晶胞之间平行存在C_{杂散的情况}下，形成了上层超材料平面。发现C_杂散的存在每个单位单元的间隙会严重影响MIMO天线的带宽。较高的电容值将导致电容率的负值。然后，将上层平面放置在4 × 2 MIMO的顶部，间隙为5 mm。集成后，带宽提高到了12.45％（5.65-6.4GHz），而MIMO天线本身只有3.49％的带宽（5.91-6.12GHz）。此外，负磁导率特性是由互补晶胞之间的强磁场产生的，具有14.05-dBi的峰值增益。除此之外，所提出的天线设法使相互耦合最小，并提高了平均有效增益，包络相关系数和复用效率。