设计了一种小型的双极化共形天线,该天线由四个倒F 天线和一对差分微带线功分器组成,其中,四个倒F 天线等间距顺序排列在环形介质板上,相对位置上的倒F 天线通过差分馈电产生双线极化。采用电磁仿真软件Ansoft HFSS 17对该天线进行了设计和仿真,结果表明:该天线工作在495 MHz~505 MHz 频带内满足驻波比小于2,在工作带宽内实现了双线极化辐射特性,并且具有稳定的增益。天线主体尺寸为0. 25λ×0. 25λ×0. 11λ(λ 表示中心频率在自由空间中的波长),有效地实现了小型化。此外,文中提出的天线采用共形设计,天线附着在圆柱形腔体壁上,几乎不占用腔体内部空间,更容易集成到其他系统中,对于多天线系统的设计具有良好的参考价值。

A miniaturized dual-polarized conformal antenna is presented. The proposed antenna consists of four inverted-F antennas, a pair of differential microstrip power dividers. The four inverted-F antennas are arranged symmetrically around the center of the antenna to generate dual linear polarization when they are excited differentially. The antenna is designed and simulated through electromagnetic simulation software Ansoft HFSS 17. Simulated results show that the antenna realizes dual linear polarization, a stable radiation pattern and gain within an operating bandwidth from 495 MHz to 505MHz (VSWR<2), while maintains a small size of 0. 25λ×0. 25λ×0. 11λ(λ represents the free-space-wavelength of the operating frequency). Besides, the proposed antenna adopts conformal design, which can be clung to the inner wall of the cylindrical cavity without occupying the inner space of the cavity. The presented antenna can be easily integrated into other systems. The method in this paper can be a good reference for design of other multi-antenna system.

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