This letter proposes a dielectric superstrate to reduce the couplings between copolarized and cross-polarized antenna elements in realistic base station (BS) arrays. The mutual couplings are reduced by adjusting the permittivity and profile of the dielectric superstrate to create “reflected” waves to neutralize the original coupling wave. The dielectric superstrate is a simple structure that is easy to design and manufacture. A large dielectric board and four small dielectric blocks help reduce the couplings between horizontal and vertical antenna elements, whereas a dielectric pillar is added to suppress the coupling between diagonal elements. The superior decoupling performance (>25 dB isolation) is demonstrated for dual-polarized BS arrays over the fifth generation frequency band of 3.3–3.8 GHz, without affecting the matching and radiation performances of the array elements.

中文翻译：

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介电覆膜与基站阵列的互耦合降低

这封信提出了一种介电覆盖层，以减少现实基站（BS）阵列中同极化和交叉极化天线元件之间的耦合。通过调节介电覆层的介电常数和轮廓以产生“反射”波以抵消原始耦合波，可以减少相互耦合。介电覆层是一种易于设计和制造的简单结构。一个大介电板和四个小介电块有助于减少水平和垂直天线元件之间的耦合，而增加了一个绝缘柱以抑制对角线元件之间的耦合。在3.3-3.8 GHz的第五代频段上，双极化BS阵列具有出色的去耦性能（隔离度> 25 dB），