In this article, a new configuration of a multiple-input-multiple-output (MIMO) antenna system for super-wideband response is presented. The proposed antenna consists of four microstrip line-fed compact 3-elements quasi-Yagi antennas placed perpendicularly to each other. Each element has a bow-tie-driven monopole element over a finite ground plane backed by a flared truncated ground reflector and a diamond-shaped director. The end-fire radiation pattern over the wider bandwidth has been achieved using a bow-tie monopole-driven element. The measured impedance bandwidth (for |S₁₁| ≤ −10 dB) is from 1.37 to 16 GHz (168.5% at 8.68 GHz mid-frequency), and port isolation is better than 16 dB with a common ground plane. The measured gain and efficiency variations are between 3.5 and 5.4 dBi and 56–90%, respectively. These characteristics are in good agreement with theoretical results. The calculated envelope correlation coefficient and capacity loss are less than 0.01 and 0.25 bit/s/Hz, respectively, over the entire operating band. The overall size of the proposed MIMO antenna is 110 × 110 × 1.6 mm³. The novelty of the proposed antenna system is the four directive beams and good diversity performance over super-wide bandwidth with a simple single-layer compact design, which makes it a promising candidate for large-capacity and high-speed communication systems.

在本文中，介绍了用于超宽带响应的多输入多输出 (MIMO) 天线系统的新配置。所提出的天线由四个相互垂直放置的微带线馈电紧凑型 3 单元准八木天线组成。每个元件在有限地平面上都有一个领结驱动的单极元件，由一个喇叭形截断地面反射器和一个菱形导向器支持。使用领结单极驱动元件实现了更宽带宽上的端射辐射模式。测得的阻抗带宽（对于 |S ₁₁| ≤ −10 dB) 为 1.37 至 16 GHz（8.68 GHz 中频为 168.5%），端口隔离优于 16 dB，具有公共接地层。测得的增益和效率变化分别在 3.5 到 5.4 dBi 和 56–90% 之间。这些特性与理论结果非常吻合。在整个工作频段上，计算的包络相关系数和容量损失分别小于 0.01 和 0.25 比特/秒/赫兹。拟议的 MIMO 天线的整体尺寸为 110 × 110 × 1.6 mm ³。所提出的天线系统的新颖之处在于具有四个定向波束和在超宽带宽上具有良好的分集性能，并且具有简单的单层紧凑设计，这使其成为大容量和高速通信系统的有希望的候选者。