短波天线阻抗测量系统研究

发布时间：2018-03-16 05:14

本文选题：短波天线　切入点：阻抗测量　出处：《西安电子科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：在我国,随着无线通信技术的飞速发展,天线行业已在我国国民经济中占据重要的地位。但是在短波频段,天线的发展还相对滞后,没有新的突破。由于短波天线自身体积大、常架设于野外,其阻抗难以通过常规天线测试系统进行测量。如何搭建简单、便携的天线阻抗测量系统是短波天线面临的首要难题。论文针对短波天线阻抗测量的难题,研究了简单、便携的天线阻抗系统的设计和搭建,完成的任务主要有以下几个方面:1、本文首先深入研究了天线阻抗的基本知识,并在此基础上分析了天线阻抗测量的四种方法:测量线法、反射计法、扫频长线法、电桥法。针对这四种天线阻抗测量的方法,以及通过对安捷伦N5230A网络分析仪的阻抗测量原理分析,充分考虑该测量系统主要工作在短波频段,最终决定采用基于集总参数双定向耦合器的天线阻抗测量系统。2、设计了集总参数双定向耦合器。论文从定向耦合器的原理出发,设计、仿真并加工了集总参数双定向耦合器。针对工作在短波频段的双定向耦合器,首先分析了变压器的串并联耦合;其次,讨论了单定向耦合器的原理并使用两个单定向耦合器设计了三磁环双定向耦合器;再次,使用ADS2009仿真了该双定向耦合器,并优化了各元器件;最后根据优化的参数加工了实物,并进行了测量。测试结果表明,该耦合器耦合度满足30dB±0.5dB,方向性大于20dB,插入损耗小于0.3dB,端口电压驻波比小于1.25,达到了技术指标要求。3、搭建了天线阻抗测量系统。首先对该系统的工作原理进行了深入分析,从理论上证明了该系统的可行性;其次,针对天线阻抗测量系统中的信号源、以及检测芯片进行了选择,并简要介绍了各个部件的原理和功能,在工程方面论证了天线阻抗测量系统的可行性。
[Abstract]:In China, with the rapid development of wireless communication technology, the antenna industry has occupied an important position in our national economy. But in the short wave band, the development of antenna is relatively lagging behind, there is no new breakthrough. In the field, the impedance is difficult to be measured by the conventional antenna test system. How to build a simple and portable antenna impedance measurement system is the most important problem for the shortwave antenna. In this paper, the impedance measurement problem of the shortwave antenna is discussed. The design and construction of a simple, portable antenna impedance system is studied. The main tasks are as follows: 1. The basic knowledge of antenna impedance is studied in this paper. On this basis, four methods of antenna impedance measurement are analyzed: measurement line method, reflectometer method, sweep long line method, bridge method. And through the analysis of the impedance measurement principle of Agilent N5230A network analyzer, it is fully considered that the measurement system mainly works in the shortwave band. Finally, the antenna impedance measurement system based on lumped parameter double directional coupler is adopted, and the lumped parameter double directional coupler is designed. The double directional coupler with lumped parameters is simulated and fabricated. The series-parallel coupling of the transformer is first analyzed for the double directional coupler working in the shortwave band. The principle of single directional coupler is discussed and three magnetic ring double directional coupler is designed by using two single directional couplers. Thirdly, the double directional coupler is simulated by ADS2009, and the components are optimized. The measurement results show that, The coupling degree of the coupler is 30 dB 卤0.5 dB, the directivity is more than 20 dB, the insertion loss is less than 0.3 dB, the VSWR of the port is less than 1.25, and it meets the technical requirements. 3. The antenna impedance measurement system is built. The working principle of the system is analyzed deeply. The feasibility of the system is proved theoretically. Secondly, the signal source and detection chip in the antenna impedance measurement system are selected, and the principle and function of each component are briefly introduced. The feasibility of antenna impedance measurement system is demonstrated in engineering.
【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】：2015
【分类号】：TN622;TN822.3

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