超短波小型化宽带加载天线的研究

发布时间：2018-01-22 22:29

本文关键词： 超短波宽带小型化笼型对称阵子阵列天线　出处：《西安电子科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：天线在通信系统之中是不可缺少的部分。在现代军事通信当中,为了达到安全保密通信,降低敌方的干扰,调频、扩频通信技术在短波、超短波电台等通信设备中得到了广泛的应用,而坦克、舰艇上的天线众多,携带不便,要求多个电台通过一副天线工作,这些均对天线的宽带化提出了比较高的要求;工作在超短波频带的天线一般物理尺寸都比较大,容易暴露身份,所以如何在保证天线性能的基础上,实现天线的小型化和宽带化,是近年来研究的一个热点。本文研究的主要内容是宽带小型化天线的设计与实现,详细介绍了线天线的矩量法分析与计算及圆环阵的相关理论,着重阐述了天线的宽带化和小型化技术,在研究中结合理论分析,采用feko仿真软件,设计了两副天线。论文的主要工作概括为以下几个方面:1、设计了一副225-512MHz宽带笼型天线,该天线具有良好的驻波比和方向图带宽特性,在天线结构的设计上,将传统的柱型对称阵子结构改为由八根导电丝组成的线栅结构,构成一个笼型对称阵子天线,并在此基础上通过在馈电处增加电感等方法,可以有效地扩展对称阵子的带宽。对影响该天线工作性能的参数进行了认真分析,总结得到了各个参数的最优值。仿真结果表明,该天线的驻波比在整个频带内小于2.5,增益大于2dB,满足指标要求。2、设计了一种八单元圆环阵列天线,着重分析了八单元均匀圆环阵列各阵元等幅同相激励时的方向图特性、等幅异相激励时阵列在方位面的扫描特性和等幅异相激励时在不同频点上扫描时副瓣电平的变化。
[Abstract]:Antenna is an indispensable part of the communication system. In modern military communications, in order to achieve secure and secure communications, reduce the enemy interference, FM, spread spectrum communication technology in short wave. Ultrashort wave radio and other communication equipment have been widely used, and tanks, ships have a large number of antennas, carrying inconvenience, requires a number of radio stations to work through a pair of antennas. These all put forward the higher request to the antenna wideband; The antenna working in ultrashort frequency band is usually larger in physical size and easy to expose its identity. So how to achieve the antenna miniaturization and broadband on the basis of ensuring the antenna performance. In this paper, the design and implementation of wideband miniaturized antenna are discussed in detail. The analysis and calculation of wire antenna by mom and the theory of ring array are introduced in detail. In this paper, the wideband and miniaturization techniques of antenna are described. In the research, two antennas are designed by using feko simulation software combined with theoretical analysis. The main work of this paper is summarized as follows: 1. A 225-512MHz wideband cage antenna is designed. The antenna has good standing wave ratio (VSWR) and pattern bandwidth. The traditional cylindrical symmetric matrix structure is changed into a wire grid structure composed of eight conductive wires to form a cage symmetric matrix antenna. On this basis, the inductance is added to the feed. The parameters affecting the performance of the antenna are analyzed carefully, and the optimum values of each parameter are obtained. The simulation results show that. The standing wave ratio of the antenna is less than 2.5 and the gain is more than 2 dB in the whole frequency band. In this paper, the pattern characteristics of eight element uniform ring array elements are analyzed under the same amplitude and same phase excitation. The scanning characteristics of array at azimuth plane and the variation of sidelobe level at different frequency points under constant amplitude phase excitation.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN822

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