ABSTRACT In this paper, high port isolation in dual feed orthogonally polarized square patch antenna array is achieved by the use of Defected Ground Structure (DGS). A simple rectangular-headed cross DGS is implanted in the ground plane underneath the square patch in order to achieve high port isolation between two orthogonal ports at 2.95 GHz. The proposed design offers 58.55 dB port isolation between ports of single element patch and 45 dB that for two-element arrays. The port isolation of microstrip antenna with and without DGS has been studied and the result indicates better port isolation of the array with high cross polarization for two orthogonal polarizations owing to the effect of DGS. Finally, the two-element array is considered for MIMO application and mutual coupling between them is investigated. The simulated results of the proposed antennas are found to be in close agreement with the experimentally measured ones.

中文翻译：

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使用 DGS 的双极化微带天线阵列的高端口隔离

摘要在本文中，双馈正交极化方形贴片天线阵列中的高端口隔离是通过使用缺陷接地结构（DGS）实现的。在方形贴片下方的接地平面中植入一个简单的矩形头交叉 DGS，以在 2.95 GHz 的两个正交端口之间实现高端口隔离。提议的设计在单元格贴片的端口之间提供 58.55 dB 的端口隔离，为二单元阵列提供 45 dB 的端口隔离。研究了有和没有 DGS 的微带天线的端口隔离度，结果表明由于 DGS 的影响，对于两个正交极化具有高交叉极化的阵列的端口隔离度更好。最后，考虑了二元阵列在 MIMO 应用中的应用，并研究了它们之间的相互耦合。