An engineered metamaterial is proposed for achieving the circular polarization and suppression of mutual coupling in closely placed four-port MIMO (multi-input multi-output) antenna. Data rate and channel capacity (bits/s/Hz) are enhanced four times as all the four ports of the proposed MIMO antenna are radiating and receiving the signals within the same frequency band. Secondly, the recommended antenna doesn’t radiate harmful electromagnetic radiations as it carries low profile characteristics. Design equations are also developed through which antenna could be designed at any desired frequency of interest. Before the analysis of antenna, the unit cell of the metamaterial is analyzed and its double negative characteristics are verified at the resonant frequency. Further, a slow-wave structure is designed and investigated with a microstrip line; subsequently, it is embedded with the proposed antenna structure to refine the characteristics of the antenna. Highly suppressed mutual coupling of the value of −40 dB is achieved between diagonal-ports of the antenna. The proposed antenna offers uncorrelated radiations with satisfactory gain, axial ratio and minimum mutual coupling. The prototype of the proposed structure is manufactured to validate the simulated results with experimental results.

提出了一种工程化的超材料，以实现紧密放置的四端口MIMO（多输入多输出）天线中的圆极化和相互耦合抑制。由于建议的MIMO天线的所有四个端口都在同一频带内辐射和接收信号，因此数据速率和信道容量（位/秒/赫兹）提高了四倍。其次，推荐的天线不具有有害的电磁辐射，因为它具有低剖面特性。还开发了设计方程，通过该方程可以在任何所需的感兴趣频率下设计天线。在分析天线之前，先对超材料的晶胞进行分析，并在共振频率下验证其双重负特性。此外，设计并用微带线研究慢波结构。随后，将其嵌入拟议的天线结构中以完善天线的特性。在天线的对角端口之间实现了−40 dB值的高度抑制的互耦。拟议中的天线提供了不相关的辐射，具有令人满意的增益，轴向比和最小的互耦合。制造所提出结构的原型以通过实验结果验证模拟结果。