This paper has proposed a Fork-shaped stub with Vias Based Coupling Current Steering (VBCCS) to enhance the isolation between 2×2 and 4×4 ultra-wideband (UWB) MIMO antenna. The proposed antenna is evolved using Characteristic Mode Analysis (CMA) to provide physical insight into the structure. The excitation of multiple characteristics modes facilitates the attainment of the UWB spectrum. The VBCCS with Fork-shaped stub based methodology makes it possible to redirect characteristic current and enhance monopoles isolation. The antenna has an overall size of 20×28mm², which covers the entire UWB spectrum from 3.01 to 13.5 GHz, keeping the isolation of more than 17dB. The proposed UWB MIMO antenna presents an almost omnidirectional radiation pattern. Moreover, the diversity performance in terms of envelope correlation coefficient (ECC) < 0.01, and channel capacity loss (CL) < 0.04 b/s/Hz is analyzed. The proposed UWB MIMO antenna has a scalable phenomenon, and it can be easily extendable into 4×4 without any additional decoupling circuit. It operates from 3.05 to 13.05GHz frequency band with good antenna characteristics.

本文提出了一种基于通孔的耦合电流控制（VBCCS）的叉形短截线，以增强2×2和4×4超宽带（UWB）MIMO天线之间的隔离度。拟议的天线是使用特征模式分析（CMA）进行演进的，以提供对结构的物理了解。激发多个特征模式有助于实现UWB频谱。具有基于叉形短截线的VBCCS方法可重定向特性电流并增强单极隔离。天线的总尺寸为20×28mm ²覆盖从3.01到13.5 GHz的整个UWB频谱，隔离度保持在17dB以上。提出的UWB MIMO天线呈现出几乎全向的辐射方向图。此外，分析了包络相关系数（ECC）<0.01和信道容量损耗（CL）<0.04 b / s / Hz的分集性能。所提出的UWB MIMO天线具有可扩展的现象，并且可以容易地扩展为4×4，而无需任何额外的去耦电路。它工作在3.05至13.05GHz频段，具有良好的天线特性。