A low‐profile three‐dimensional substrate integrated waveguide (SIW) horn antenna array with its novel feeding structure is proposed in this article. The feeding element is capable of transforming the wave from one plane to its orthogonal plane. Such type of three‐dimensional SIW, H‐plane horn antenna design is not available in the existing literature. The design is proposed to provide high gain for radar, 5G, and satellite communication applications. The single SIW horn antenna does not have significant gain at the desired frequencies. When the antenna element is loaded with dielectric the gain improves by 1.4 dB. The antenna elements are further arranged in a box shape, forming a three‐dimensional array, which improves the gain significantly. Such structure shows dual band characteristics and provides gain of 11.3 dB at 28.26 GHz and 9.64 dB at 29.41 GHz. The same three‐dimensional design when loaded with dielectric at the aperture end also show a dual band behavior and improve the gain further to 12.5 dB at 28.12 GHz and 12.55 dB at 29.28 GHz. The proposed three‐dimensional antenna designs are compared to four element linear array designs, and it shows substantial improvement in gain for the desired frequency.

中文翻译：

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用于高频应用的四元三维SIW喇叭天线阵列

本文提出了一种具有新型馈电结构的低剖面三维衬底集成波导（SIW）喇叭天线阵列。馈电元件能够将波从一个平面转换到其正交平面。现有文献中没有这种类型的三维SIW，H平面号角天线设计。提出该设计可为雷达，5G和卫星通信应用提供高增益。单个SIW喇叭天线在所需频率下没有明显的增益。当天线元件装有电介质时，增益提高1.4 dB。天线元件进一步以箱形排列，形成三维阵列，从而显着提高了增益。这种结构显示了双频带特性，并提供了11.3 dB的增益在28.26 GHz的和9.64分贝在29.41 GHz的。当在开口端与电介质加载的相同的三维设计还示出的双频带的行为和进一步提高增益12.5分贝在28.12千兆赫和12.55分贝在29.28千兆赫。将拟议的三维天线设计与四元线性阵列设计进行了比较，它显示了所需频率增益的显着改善。