This article presents a circularly polarized 4-port Multiple Inputs Multiple Outputs dielectric resonator-based antenna with two resonating bands for WLAN (5.0 GHz) and WiMAX (3.5 GHz) applications. Important attributes of proposed MIMO-DRA are: (i) Bandwidth enhancement is observed due to the use of ring-shaped ceramic material radiator; (ii) Incorporation of rectangular aperture lead to excite the dual hybrid mode in ring DRA, which helps to support dual-frequency range (iii) Circular polarization is achieved in both operating bands by conversion of rectangular to Z-shaped slot; and (iv) mutual coupling among port <−18 dB due to the use of space diversity. The fabricated prototype of the MIMO radiator is measured experimentally, which confirms the dual impedance bandwidth of 3.35 – 3.82 GHz and 5.09 – 5.41 GHz. The proposed antenna is right-handed circularly polarized (RHCP) within the frequency range of 3.54 – 3.72 GHz & 5.04 – 5.16 GHz respectively.

中文翻译：

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用于WLAN/WiMAX应用的双频四端口圆极化MIMO DRA设计

本文介绍了一种圆极化 4 端口多输入多输出基于介质谐振器的天线，具有用于 WLAN (5.0 GHz) 和 WiMAX (3.5 GHz) 应用的两个谐振频带。所提议的 MIMO-DRA 的重要属性是： (i) 由于使用环形陶瓷材料辐射器，观察到带宽增强；(ii) 在环形 DRA 中引入矩形孔径导致激发双混合模式，这有助于支持双频范围 (iii) 通过将矩形槽转换为 Z 形槽，在两个工作频段实现圆极化；(iv) 由于使用空间分集，端口之间的相互耦合 <-18 dB。通过实验测量制造的 MIMO 辐射器原型，证实了 3.35 – 3.82 GHz 和 5.09 – 5.41 GHz 的双阻抗带宽。