In this research work, a modified shared rectangular radiator is proposed for 5.7‐GHz wireless application using multiple cuts and partially stepped ground. The shared design requires no isolating structure to decouple the ports. The proposed shared geometry produces >13 dB isolation in the 4.4‐ to 6.4‐GHz operating band. The gain varies from 3.0 to 6.2 dBi, and radiation efficiency is >70 % in the band. The mutual coupling among the port is reduced by orthogonal arrangement of ports, and envelope correlation coefficient (ECC) is <0.04 in the presented band. Apart from this, isolation in the proposed shared radiator is enhanced by additional multiple cuts with stepped ground. The indoor‐outdoor suitability of multiple input multiple output (MIMO) antenna for isotropic and Gaussian medium is checked by mean effective gain (MEG) and specific absorption rate (SAR). The presented results of MEG and SAR fulfill the required safety norms as per the ITU for different environments.

中文翻译：

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四端口共享矩形散热器，接地不良，用于无线应用

在这项研究工作中，提出了一种经过修改的共享矩形辐射器，该辐射器适用于5.7 GHz无线应用，使用了多个切口和部分阶梯状的地面。共享设计不需要隔离结构即可解耦端口。提议的共享几何结构在4.4至6.4 GHz工作频带中产生> 13 dB的隔离度。增益从3.0到6.2 dBi不等，该频段的辐射效率> 70％。端口之间的相互耦合通过端口的正交排列而减少，并且在给出的频带中，包络相关系数（ECC）<0.04。除此之外，通过阶梯状接地的额外多次切割，可以增强建议的共享散热器中的隔离度。通过平均有效增益（MEG）和比吸收率（SAR）检验多输入多输出（MIMO）天线对各向同性和高斯介质的室内外适用性。提出的MEG和SAR结果满足了ITU所要求的针对不同环境的安全规范。