A compact beam-scanning flat antenna array with high gain based on the substrate- integrated waveguide (SIW) is presented in this article. The radiation elements are the continuous transverse stub (CTS) constructed by SIW, which are arrayed on the substrate. The SIW-CTS array has a 4 dB higher gain than the traditional CTS array with the metal parallel plate waveguide and the theoretical explanation is analyzed. A new compact corporate-feed network consisting of an SIW-horn and a flat lens is also proposed. The flat lens could convert the cylindrical wavefront generated by the feed probe and the SIW-horn to a planar wavefront for feeding the CTS array. The Taylor distribution of the feed level made the array has a low sidelobe and high gain. The beam scanning of the array could be realized by simply moving the small SIW-horn along the line across the focal point. An eight-element array is designed, simulated, and fabricated to verify the design. The measured results show that the scanning range is from −35° to 35° with the highest gain of being 20.6 dBi and the sidelobe level of −25.2 dB at the broadside.

中文翻译：

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基于基板集成波导的紧凑型光束扫描平面阵列

本文介绍了一种基于衬底集成波导 (SIW) 的高增益紧凑型波束扫描平面天线阵列。辐射元件是由 SIW 构建的连续横向短截线 (CTS)，它们排列在基板上。SIW-CTS 阵列的增益比采用金属平行板波导的传统 CTS 阵列高 4 dB，并分析了理论解释。还提出了一种由 SIW 喇叭和平面透镜组成的新型紧凑型企业馈送网络。平面透镜可以将馈电探头和 SIW 喇叭产生的柱面波前转换为平面波前，用于馈送 CTS 阵列。馈源电平的泰勒分布使得阵列具有低旁瓣和高增益。阵列的波束扫描可以通过简单地沿着穿过焦点的线移动小 SIW 喇叭来实现。设计、模拟和制造了一个八单元阵列以验证设计。实测结果表明，扫描范围为-35°至35°，最高增益为20.6 dBi，宽边旁瓣电平为-25.2 dB。