【作者】 陈瑾；

【导师】 傅光；

【作者基本信息】 西安电子科技大学 ， 电磁场与微波技术， 2006， 硕士

【摘要】 本文阐述了宽带天线的基本理论，简要分析了常用的展宽天线带宽的方法。文章主要做了两方面的工作，一是分析了加载方法来展宽带宽，在Altshuler天线理论的基础上，对工作在超短波，带宽三个倍频的直立单极子天线加载的位置以及大小进行了研究，得出了加载大小及位置对指标影响的一般规律。二是研究了实频数据法、直接优化法以及遗传算法等宽带匹配网络设计方法，并设计出了结构简单、工作性能良好的网络。在这样的工作基础上，设计出了一种适合于无人机特殊安装环境要求的超短波宽带天线，同样研究了这种天线的加载以及匹配网络设计。最后对天线的计算结果和测试结果进行了对比分析，总结出了同类问题的规律。更多还原

【Abstract】 The basic theory of broadband antenna is explained in this paper ,and some usual methods to broaden the bandwidth of antenna are analyzed, in which we choose load to broaden the bandwidth in our experiment. According to Altshuler theory, we discussed and selected the appropriate place and magnitude of loading for an ordinary monopole of which the working bandwidth is broad. The usual way to design a broadband matching network such as Real Frequency Method、Direct Optimal Method and Genetic Algorithm, are analyzed and then a network with simple structure but good performance is gained.Then a new type of monopole is proposed in order to meet some special need.The new antenna has a gradient radiator besides an upstanding part, which made it different from the common monopole. Similarly, load and broadband matching network of this antenna is studied in this paper.At the end of the paper, the results of computing and that of test are compared, and we obtained the rule for similar problems.更多还原