In this paper, we propose a novel design of a two-element array antenna on an electrical thick substrate with an extremely narrow array distance. The proposed array consists of a rectangular ring patch printed on a thick substrate and a monopole wire in the center of the substrate. Each element has a modal difference in the radiation pattern, causing high isolation and low correlation between the array elements. From the measurement results, the monopole and patch elements exhibit reflection coefficients of −10 dB and −10.7 dB with peak gains of 3.8 dBi and 6.1 dBi, respectively, at 1.6 GHz. The mutual coupling between the two elements is −20.7 dB. For modal analysis of the antenna pattern, spherical mode decomposition is performed on the radiation patterns of the two elements, and low envelope correlation coefficient levels below 16% are maintained. We also investigate the antijamming performance using a power inversion algorithm in a practical pattern nulling application; a null depth of −47.7 dB and a null width of 33.2 are obtained when the interference signal arrives at the elevation angle of 45.

中文翻译：

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基于辐射方向图模态差的高隔离度和低方向图相关性的电厚基板上的异质两元阵列天线设计

在本文中，我们提出了一种新颖的双元素阵列天线设计，该阵列天线位于电学厚基板上，具有极窄的阵列距离。所提出的阵列由印刷在厚基板上的矩形环补丁和位于基板中央的单极线组成。每个元件在辐射方向图上都有一个模态差异，从而导致阵列元件之间的高度隔离和低相关性。根据测量结果，单极和贴片元件在1.6 GHz时的反射系数分别为-10 dB和-10.7 dB，峰值增益分别为3.8 dBi和6.1 dBi。两个元件之间的互耦为-20.7 dB。为了对天线方向图进行模态分析，对两个元素的辐射方向图执行球面模式分解，并保持低于16％的低包络相关系数水平。我们还研究了在实际模式归零应用中使用功率倒置算法的抗干扰性能。当干扰信号到达45度的仰角时，获得的零点深度为-47.7 dB，零点宽度为33.2。