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在对传统八木天线分析的基础上,为提高天线使用的灵活性和工作带宽,设计了一种以2.4GHz为中心工作频率的参数可变的18单元八木天线。设计过程中利用VB软件设计了一款天线计算器,方便了天线尺寸参数的计算和优化调整,还使用HFSS软件搭建天线的模型,并对其中一种参数方案进行仿真优化。测量结果表明:在2.3GHz～2.5 GHz频率范围内,天线方向图较好,与仿真结果较为吻合,天线输入端电压驻波比和回波损耗较为理想。
Based on the analysis of the traditional Yagi antenna, in order to improve the flexibility of using the antenna and the working bandwidth, a variable parameter 18-cell Yagi antenna with a frequency of 2.4 GHz is designed. In the process of designing, an antenna calculator is designed by using VB software to facilitate the calculation and optimization of the antenna size parameters. The HFSS software is also used to build an antenna model and one of the parameter schemes is simulated and optimized. The measurement results show that the antenna pattern is good in the frequency range of 2.3GHz ~ 2.5GHz, which is in good agreement with the simulation results. The voltage standing wave ratio and return loss of the antenna input are ideal.