【作者】 赵东贺；

【导师】 徐良；

【作者基本信息】 西安电子科技大学 ， 无线电物理， 2010， 硕士

【摘要】 本论文详细地介绍了天线的宽带小型化关键技术,重点研究了应用于移动车载电台的超短波宽带天线的设计与实现。在研究中采用理论分析,数值仿真和实验验证等手段,提出了一种结构新颖的天线设计方案。主要工作有:对于在高架状态下使用的超短波移动通信天线,创造性的采用了双极双鞭的天线结构形式,有效的增加了天线的带宽,摆脱了传统天线需要地面提供镜像的限制。由于采用LC宽带匹配网络,网络引起的损耗很小,因而天线的辐射效率很高,增加了通信距离。制作了工作于30-88MHz的超短波宽带双鞭天线的实物样机,进行了实验测试,测试结果表明,所设计的天线,在工作频带内具有良好的电气性能,VSWR≤2.5,增益≥1dBi,满足客户使用的要求。此外,通过适当减小天线的尺寸,巧妙地设计了一种阻抗变换器和匹配网络,将天线的工作频段展宽到30-400MHZ。另一方面工作是提出了一种应用于车载的电离层垂测天线方案,采用倒V结构加天调的天线形式,具有结构简单,便于携带和可以快速安装拆卸等优点,并从数值仿真和天线的缩比模型试验对天线方案的可行性进行了验证,效果很好。更多还原

【Abstract】 A new type of VHF broadband twin-whip antenna was introduced and analyzed in this dissertation. A structure of the antenna was designed based on the theoretical analysis, and numerical simulation. The real dimension and the configuration were modified through the experiment studying. The major contributions in this paper are as follows: In some special cases the antenna has to be raised to certain height for longer distance communication. The traditional monopole whip antenna is not useful, and more because of no ground existing now. A bipolar twin-whip structure was a good choice at the moment. It has the wideband property and current balance effect. Good impedance matching networks was achieved by using LC circuit. The antenna has high radiation efficiency.A VHF broadband twin-wipe antenna prototype over 30-88MHz was made. Experimental results show that VSWR≤2.5, GAIN≥1dBi.It meets the requirements of the customer. If some losses were introduced, the antenna bandwidth can be expanded to wider range, such as 30-400MHz by adjusting LC circuit and the ratio impedance transfer.In addition, a design program of ionosphere vertical detection antenna is proposed, which used inverted V antenna structure with the matching tuner. The antenna has the advantages of simple structure and easy installation and removal. The feasibility of the antenna is verified through the numerical simulation and scale model test.更多还原