A broadband horizontally polarized omnidirectional antenna array is proposed, which consists of a circular array of four identical broadband T‐bar fed cavity‐backed slot antenna elements and a 1‐to‐4 power divider. The proposed omnidirectional antenna array has a compact diameter of only 0.44λ₀, a broad bandwidth of 75.9% (450‐1000 MHz) and a favorable omnidirectional radiation pattern in the azimuth plane with a gain variation below 3 dB in the operating band. Moreover, the cavity‐backed structure makes the proposed antenna array hardly affected by metal environment and the all metal construction allows for high‐power applications, and the reserved cable channel behind the cavities of the antenna elements ensures the extensionality and stability of the proposed array when longitudinal array expansion is needed. Design procedures of the proposed antenna array have been described in detail, simulations and measurements of the proposed antenna array have also been carried out to validate its performance in this article.

中文翻译：

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具有稳定的水平极化全向辐射的宽带T型杆馈电缝隙天线阵列

提出了一种宽带水平极化全向天线阵列，该阵列由四个相同的宽带T型杆馈电背腔式缝隙天线元件和一个1-4功率分配器的圆形阵列组成。所提出的全向天线阵列具有仅0.44的紧凑直径λ ₀，其宽带宽为75.9％（450-1000 MHz），并且在方位角平面上具有良好的全向辐射方向图，在工作频带内增益变化低于3 dB。此外，背腔结构使拟议的天线阵列几乎不受金属环境的影响，全金属结构允许大功率应用，并且天线元件腔体后方的预留电缆通道确保了拟议阵列的可扩展性和稳定性需要纵向数组扩展时。本文已详细描述了所提出的天线阵列的设计程序，还对所提出的天线阵列进行了仿真和测量，以验证其性能。