The design of a low-profile wideband shared-aperture dual-polarized antenna is proposed. The proposed antenna consists of a cavity-backed slot antenna to produce vertical polarization and a slot-backed monopole antenna for horizontal polarization. The slot operates as a radiator for vertical polarization and at the same time, it works as a reflector for horizontal polarization. Two antenna prototypes are designed and simulated. The initial design has a profile of $0.28{\lambda }_{\max }$ , where ${\lambda }_{\max }$ is the free space wavelength at the lowest frequency. The vertical and horizontal polarized antennas exhibit 36.1% and 39.7% bandwidths, respectively. By adding a notch in the slot, the current path increases, which reduces the operating frequency band; hence, the low-profile design is accomplished. The new version features a profile of $0.17{\lambda }_{\max }$ with 28.2% and 36% bandwidths for vertical and horizontal polarizations, respectively. The low-profile prototype is fabricated and measured. The measured S-parameters are consistent with the simulated one. The measured realized gain varies from 1 to 4.2 dBi for vertical polarization, while it varies from 1 to 2.5 dBi for horizontal polarization. The total efficiency of the proposed antenna is above 85% within the operating band for both polarizations. The far-field radiation pattern is measured, and a good agreement is achieved with the simulated one.

中文翻译：

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利用双功能插槽的薄型宽带共享孔径双极化天线

提出了一种薄型宽带共享孔径双极化天线的设计方案。拟议的天线由产生垂直极化的背腔式缝隙天线和用于水平极化的背缝式单极天线组成。缝隙用作垂直极化的辐射器，同时，它也用作水平极化的反射器。设计并仿真了两个天线原型。初始设计的配置文件为 $ 0.28 {\ lambda} _ {\ max} $ ，在哪里 $ {\ lambda} _ {\ max} $ 是最低频率下的自由空间波长。垂直和水平极化天线的带宽分别为36.1％和39.7％。通过在插槽中添加一个槽口，电流路径会增加，从而降低了工作频带；因此，低调设计得以实现。新版本具有以下特征： $ 0.17 {\ lambda} _ {\ max} $ 垂直和水平极化的带宽分别为28.2％和36％。低调原型被制造和测量。测得的S参数与模拟值一致。对于垂直极化，测得的实现增益在1到4.2 dBi之间变化，而对于水平极化，它在1到2.5 dBi之间变化。所建议的天线的总效率在两种极化的工作频带内都高于85％。测量了远场辐射方向图，并与模拟的辐射图取得了良好的一致性。