ABSTRACT In this communication, dielectric resonator based two-port Multi Input Multi Output (MIMO) antenna is structured and examined. L-shaped microstrip line with a serial step impedance transformer is used to excite moon-shaped aperture, which in turn stimulates ring-shaped dielectric resonator antenna. Some of the important features of the proposed MIMO radiator are: (i) alteration of cylindrical to ring-shaped dielectric resonator is supportive to give wide-impedance bandwidth; (ii) aperture excites dual orthogonal hybrid ( and ) mode inside the ring dielectric resonator antenna, which aids to get dual-band circular polarization waves; and (iii) use of polarization diversity concept is helpful to give lesser mutual coupling (less than −20 dB) between the ports. After doing experimental confirmation, the proposed radiator is working over the frequency range 2.4–3.88 GHz. It also supports 3-dB axial ratio in dual-frequency range, i.e., 2.44–2.64 GHz and 3.4–3.65 GHz, respectively. Right-handed circular polarization and good value of diversity parameters make the proposed antenna employable for WLAN (2.5 GHz) and WiMAX (3.3 GHz) applications.

中文翻译：

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具有极化分集的双端口双频圆极化介质谐振器MIMO天线

摘要 在本次通信中，构建并检查了基于介质谐振器的二端口多输入多输出 (MIMO) 天线。L形微带线与串联步进阻抗变换器用于激发月形孔径，进而激发环形介质谐振器天线。所提出的 MIMO 辐射器的一些重要特征是： (i) 将圆柱形介质谐振器改为环形介质谐振器有助于提供宽阻抗带宽；(ii) 孔径在环形介质谐振器天线内部激发双正交混合（ 和 ）模式，这有助于获得双波段圆极化波；(iii) 使用极化分集概念有助于减少端口之间的相互耦合（小于 -20 dB）。做实验确认后，建议的辐射器在 2.4-3.88 GHz 的频率范围内工作。它还支持双频范围内的 3dB 轴比，即分别为 2.44-2.64 GHz 和 3.4-3.65 GHz。右手圆极化和良好的分集参数值使建议的天线可用于 WLAN (2.5 GHz) 和 WiMAX (3.3 GHz) 应用。