In this paper, an angular symmetric, common radiator coplanar waveguide (CPW) fed four-port multiple-input-multiple-output (MIMO) antenna is designed on a $0.129\lambda _{\mathrm{ L}}^{2}$ RT Duroid ( $\varepsilon _{\mathrm{ r}} =3.0$ , tan $\delta =0.001$ ) substrate where $\lambda _{\mathrm{ L}}$ is the free space wavelength at the lowest operating frequency ( ${f} _{\mathrm{ L}}$ ) of 0.6 GHz. The antenna has a −6 dB impedance bandwidth from 0.6–1.09 GHz, 2.6–3.4 GHz and 4.2–7.0 GHz to cover the emerging wireless communication bands. At the same time, it also has a −10 dB impedance bandwidth extending from 0.7–1.01 GHz, 2.6–3.18 GHz, 5.3–6.06 GHz, and 6.7–6.94 GHz. Design steps to enhance the operating bandwidth and the isolation in the sub-1GHz bands are presented. The antenna has a reasonable realized gain at the simulated and measured frequencies. It exhibits the pattern diversity which is useful for the MIMO implementation. The envelope correlation coefficient (ECC), Mean effective gain (MEG), and the channel capacity of the antenna have been computed from the measured results. In spite of the small circuit size at ${f} _{\mathrm{ L}}$ , the ECC ≤ 0.50 over the entire band is observed. In addition to the existing communication applications, this antenna can find newer applications in the emerging 0.6–1.09 GHz band, sub-6GHz 5G near radio (NR), and Wi-Fi 6 communications.

中文翻译：

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在灵活基板上使用通用辐射器的 4 端口 MIMO 天线，适用于低于 1GHz、低于 6GHz 的 5G NR 和 Wi-Fi 6 应用

在本文中，设计了一种角对称、共辐射器共面波导 (CPW) 馈电的四端口多输入多输出 (MIMO) 天线。 $0.129\lambda _{\mathrm{ L}}^{2}$ RT Duroid ( $\varepsilon _{\mathrm{ r}} =3.0$ , 棕褐色 $\delta =0.001$ ) 基板，其中 $\lambda _{\mathrm{ L}}$ 是最低工作频率下的自由空间波长（ ${f} _{\mathrm{ L}}$ ) 的 0.6 GHz。该天线具有从 0.6–1.09 GHz、2.6–3.4 GHz 和 4.2–7.0 GHz 的 -6 dB 阻抗带宽，以覆盖新兴的无线通信频段。同时，它还具有从 0.7-1.01 GHz、2.6-3.18 GHz、5.3-6.06 GHz 和 6.7-6.94 GHz 扩展的 -10 dB 阻抗带宽。介绍了在低于 1GHz 频段中增强工作带宽和隔离度的设计步骤。天线在模拟和测量频率下具有合理的实现增益。它展示了对 MIMO 实现有用的模式分集。包络相关系数 (ECC)、平均有效增益 (MEG) 和天线的信道容量已从测量结果计算出来。尽管电路尺寸很小 ${f} _{\mathrm{ L}}$ ，观察到整个波段的 ECC ≤ 0.50。除了现有的通信应用外，该天线还可以在新兴的 0.6-1.09 GHz 频段、低于 6GHz 的 5G 近无线电 (NR) 和 Wi-Fi 6 通信中找到更新的应用。