A novel ultrawideband dual-polarized H-plane horn antenna incorporated with a Vivaldi array is proposed. Aiming at ultrawide low-frequency applications that require dual-polarization with a compact shape, the proposed antenna employs an all-metal shared aperture structure. Different from the conventional dual-polarized horn where dual polarization is achieved using two orthogonal modes of the same waveguide, the proposed antenna uses two different types of transmission line for feeding: rectangular waveguide for vertically polarized (VP) H-plane horn antenna, and slot line for horizontally polarized (HP) Vivaldi antenna array. The Vivaldi slot significantly increases the HP bandwidth compared to the typical dual-polarized horn antennas, and does not disturb the VP radiation pattern. The proposed antenna has a measured −10 dB impedance bandwidth of 103% for HP mode, and 77.5% for VP mode. The measured peak gain for HP is 13.0 dBi and 14.3 dBi for VP. The simulated and measured results are in good alignment.

中文翻译：

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集成喇叭和 Vivaldi 阵列的双极化定向超宽带天线

提出了一种结合 Vivaldi 阵列的新型超宽带双极化 H 平面喇叭天线。针对需要双极化且外形紧凑的超宽低频应用，所提出的天线采用全金属共享孔径结构。与使用同一波导的两个正交模式实现双极化的传统双极化喇叭不同，所提出的天线使用两种不同类型的传输线进行馈电：垂直极化 (VP) H 平面喇叭天线的矩形波导，以及水平极化 (HP) Vivaldi 天线阵列的槽线。与典型的双极化喇叭天线相比，Vivaldi 插槽显着增加了 HP 带宽，并且不会干扰 VP 辐射图。建议的天线具有测量的 -10 dB 阻抗带宽，HP 模式为 103%，VP 模式为 77.5%。测得的 HP 峰值增益为 13.0 dBi，VP 为 14.3 dBi。模拟结果与实测结果吻合良好。