共面波导馈电蝶形开口振子缝隙天线

A CPW-fed Bow-tie Dipolar Slot Antenna

讨论了共面波导(CPW)馈电蝶形开口振子缝隙天线。在缝隙振子天线两端加入蝶形开口结构,形成振子蝶形组合结构天线。使用有限元仿真软件(Ansoft HFSS)分析了设计的天线,结果表明组合结构天线具有振子天线与蝶形天线的优点:蝶形天线的宽带特性与振子天线的高增益特性,整个天线的性能得到提高。使用了两种馈电方式:感性耦合和容性耦合,感性耦合时组合天线的带宽特性较好,从振子天线5.9%提高到10.32%;容性耦合时增益特性较好,从振子天线的3.19dB提高至6.27dB。分析了衬底厚度对天线的影响,衬底厚度的增加使谐振频率降低,但对天线带宽的影响不大。

A bow-fie-dipolar aperture antenna fed by coplanar wavegnide （CPW） is discussed. Bow-tie slots are added at the both ends of slot dipolar antenna. And both inductive coupling and capacitive coupling are used as feed. Numerical simulation is performed for antenna with Ansoft HFSS, which is a simulation software based on Finite Element Method （FEM）. The simulatian result shows that bandwidth of the propose antenna is about 1GHz. The bandwidth of the antenna fed by inductive coupling is increased form 5.9% to 10.32%, and the gain of the antenna fed by capacitive coupling increased from 3.19dB to 6.27dB.