太赫兹开槽介质型菲涅尔天线设计

Design of terahertz media slot Fresnel antenna

设计了一款工作在太赫兹频段的开槽介质型菲涅尔(Fresnel)透镜天线,该天线由馈电结构和透镜结构两部分组成。利用CST微波仿真软件,首先设计波纹喇叭馈电结构,其次基于波纹喇叭馈电结构设计开槽型菲涅尔透镜天线,分析全波周期、焦径比和子区等对天线性能的影响,通过横向和纵向对比,确定最佳天线参数。结果表明对天线性能影响从大到小分别为:焦径比、全波周期、子区。焦径比F/D=3、全波周期w=3、子区P=4为最佳天线参数,波纹喇叭馈电天线经过开槽介质型菲涅尔透镜天线聚焦后,天线的增益提升12.5 d B。

A Fresnel lens antenna in the terahertz regime was designed. The antenna mainly consists of two parts： a feed structure and a lens structure. Firstly, a corrugated horn feed structure was designed using CST microwave simulation software, furthermore, the media slot type Fresnel antenna was designed based on the feed structure. Focal diameter ratio, full-wave cycle, sub-regions were introduced to analyze the affection on the focusing performance. According to the comparison between the horizontal and the vertical, the optimal parameters of the antenna were confirmed. The results denote that the effect of focal diameter ratio is the most on the antenna, then fitll-wave cycle and sub-regions. When focal diameter ratio F/D is 3, full-wave cycle w is 3 and sub-regions P is 4, the antenna has the best performance. The gain increases by 12.5 dB after the corrugated horn feed antenna is focused through the media slot type Fresnel antenna.