CPW馈电缝隙耦合蝶形毫米波贴片天线
doi: 10.3724/SP.J.1146.2006.00245
CPW-Fed Bow-Tie Slot-Coupled Millimeter Wave Patch Antenna
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摘要: 该文研究了一种工作在Ka波段共面波导(CPW)馈电缝隙耦合的蝶形贴片天线。耦合缝隙位于接地板上，而不需要额外的缝隙耦合层，使天线更易与电路相集成。耦合缝隙的存在改变了接地板上原有表面电流的分布，使电流沿着缝隙边缘流动，因此馈线与辐射源的电磁耦合效率得到提高。用有限元分析软件(Ansoft HFSS)对衬底厚度、贴片角度、耦合缝隙大小等参数变化时的天线性能进行了仿真。比较并分析了S11，增益等天线性能参数的变化规律，并在带宽最优的条件下给出了一组参数值，此时天线的工作频率为35.5GHz，带宽为1.22GHz，增益为6.38dB。
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关键词:
- 共面波导;蝶形天线;贴片天线;缝隙耦合
Abstract: A CPW-fed slot-coupled millimeter wave (Ka band) patch antenna is discussed. The coupling slot is on the ground plane, hence there is no need for a couple slot layer. The presence of the coupling slot changes the current distribution on the ground plane, and the current is guided by the slot, the coupling between the feed part and the radiation part is enhanced. Ansoft HFSS, a high frequency structure simulation software based on Finite Element Method (FEM), is used to analyze the antenna performances. Variations of parameters such as: substrate thickness, bow-tie patch angle, coupling slot size, etc. are discussed. A set of parameters is given after comparing and analyzing the simulation results, such as S11 and gain of the antenna. The antenna works at the center frequency of 35.5GHz, the bandwidth is 1.22GHz, and the gain is 6.38dB. -
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