Array antennas with multipolarization function have important research value to improve the stable transmission of communication systems by supporting antenna diversity technology. In this letter, a millimeter-wave (mm-wave) quadri-polarization array antenna based on folded C-type substrate integrated waveguide is proposed. The operating principle is that the proposed differential feeding network can flexibly provide the required amplitude and phase difference, so that four mutually perpendicular single-branch slot array antennas can achieve multiple polarization characteristics. In addition, by removing the metal floor around the array antenna, the distortion of the antenna's main beam is suppressed. Simulation and experimental results show that the proposed quadri-polarization array antenna can provide orthogonal dual-linear polarization and dual-circular polarization radiation patterns. At the same time, it has the advantages of low profile and easy integration.

中文翻译：

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基于折叠C型SIW的毫米波可切换四极化阵列天线


具有多极化功能的阵列天线通过支持天线分集技术来提高通信系统的稳定传输具有重要的研究价值。在这封信中，提出了一种基于折叠C型衬底集成波导的毫米波（mm-wave）四极化阵列天线。其工作原理是所提出的差分馈电网络可以灵活地提供所需的幅度和相位差，从而使四个相互垂直的单分支缝隙阵列天线能够实现多种极化特性。此外，通过去除阵列天线周围的金属地板，可以抑制天线主波束的畸变。仿真和实验结果表明，所提出的四极化阵列天线可以提供正交双线极化和双圆极化辐射方向图。同时，它还具有薄型、易于集成等优点。