A novel wideband-connected parallel slot array for wide-angle scanning applications is proposed in this article. Different from conventional connected slot arrays, the proposed array consists of dual parallel slots, where the introduced parasitic slot acts as an additional series capacitor. The connected parallel slot array can realize low and moderate active input impedances and achieve wide bandwidth without using any complex balun. To improve the wide-angle impedance matching issue and avoid an increase in the array profile, a mixed periodic metallic strips layer with almost zero height and weight was adopted. The metallic strips layer can be regarded as a shunt capacitance between the array and free space. Additionally, equivalent circuit models were established to analyze the function of the introduced parasitic slot and metallic strips layer. The proposed connected parallel slot array achieves a concurrent bandwidth of approximately 69.2% (1.35–2.78 GHz), while covering a scanning area of ±60° in the E-, H-, and D-planes. The profile is only 0.088 $\lambda _{\mathrm {L}}$ , where $\lambda _{\mathrm {L}}$ is the wavelength of the lowest operation frequency in free space. Besides, low cross-polarization in principal planes, planar and simple structure, and light weight are also the merits of the proposed antenna array.

中文翻译：

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一种用于广角扫描的薄型轻型宽带连接平行槽阵列

本文提出了一种用于广角扫描应用的新型宽带连接并行槽阵列。与传统的连接槽阵列不同，所提出的阵列由双并联槽组成，其中引入的寄生槽充当额外的串联电容器。连接的并行槽阵列可以实现低和中等的有源输入阻抗，并在不使用任何复杂的巴伦的情况下实现宽带宽。为了改善广角阻抗匹配问题并避免阵列轮廓的增加，采用了高度和重量几乎为零的混合周期金属条层。金属条层可视为阵列与自由空间之间的并联电容。此外，还建立了等效电路模型来分析引入的寄生槽和金属条层的功能。所提出的连接并行槽阵列实现了大约 69.2% (1.35–2.78 GHz) 的并发带宽，同时在 E、H 和 D 平面中覆盖了 ±60° 的扫描区域。剖面仅为 0.088 $\lambda _{\mathrm {L}}$ ，其中 $\lambda _{\mathrm {L}}$ 是自由空间中最低工作频率的波长。此外，主平面交叉极化低、平面结构简单、重量轻也是该天线阵列的优点。