This research paper introduces a ultra-wideband (UWB) multiple input multiple output (MIMO)/diversity antenna with three rejected bands using one compact electromagnetic band gap (EBG) structure. The suggested EBG structure rejects three bands at WiMAX, WLAN, and the X-band within the passband of the UWB antenna. To achieve compactness in the conventional EBG structure, two via and square slots are introduced. This structure contributes to better impedance matching by using tapered feedline and slots in the radiating patch. To improve the isolation among all four compact UWB monopoles, decoupling strips are extended from the ground plane. Furthermore, the |S21| is below 17 dB in between the antenna elements and the envelope correlation coefficient is below 0.5, which are tolerable values within the UWB range. Furthermore, different MIMO/diversity characteristics are also discussed. An FR-4 substrate with dimensions of 38 × 45 × 1.6 mm3 is used for the fabrication of the suggested structure.

中文翻译：

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使用单个 EBG 结构的具有三频带抑制的小型化四端口 UWB MIMO 天线

本研究论文介绍了一种超宽带 (UWB) 多输入多输出 (MIMO)/分集天线，该天线采用一个紧凑的电磁带隙 (EBG) 结构，具有三个抑制频带。建议的 EBG 结构拒绝 WiMAX、WLAN 和 UWB 天线通带内的 X 波段的三个波段。为了在传统的 EBG 结构中实现紧凑性，引入了两个通孔和方槽。这种结构通过在辐射贴片中使用锥形馈线和槽有助于更好的阻抗匹配。为了提高所有四个紧凑型 UWB 单极子之间的隔离度，去耦带从接地平面延伸。此外，|小号21| 在天线元件之间低于 17 dB，并且包络相关系数低于 0.5，这是 UWB 范围内的可容忍值。此外，还讨论了不同的 MIMO/分集特性。尺寸为 38 × 45 × 1.6 mm 的 FR-4 基板3用于制造建议的结构。