回旋行波管高频系统冷测研究

发布时间：2018-04-18 00:23

本文选题：回旋行波管 + 模式变换　；参考：《电子科技大学》2017年硕士论文

【摘要】：毫米波源相对于低频微波源而言,具有分辨率高、宽频带、能量集中等优势,在军事上以及民用上都有很大的发展潜力。而在毫米波频段,回旋行波管是重要的微波信号放大器,它采用快波横向换能的工作方式,相比于传统的电真空器件,不仅具有高功率和高频率的优点,并且在工作带宽方面有着很大的竞争优势,被广泛应用于高分辨雷达、通信、电子对抗、超级干扰机、定向能武器、受控核聚变以及微波加热等多个国防、科学研究和工农业生产领域。回旋行波管的高频系统一般包括输入耦合器、输出窗和高频互作用结构,对器件有着关键影响,必须在工程应用前,对它们进行冷测实验以确保其性能的可靠。对回旋行波管高频系统的冷测主要是对输入耦合器和输出窗的传输反射性能的测试,尤其是对高频结构中各模式的传输和衰减的测量,进而研究高频结构的色散关系。回旋行波管一般用TE01模作为工作模式。TE11、TE21以及TE02等竞争模式的存在是不稳定性问题的根源。为了解决不稳定性问题,回旋行波管一般采用介质加载高频结构。介质材料的选取对高频结构的性能有着很大影响,必须对其电磁参数进行准确测量。现有的微波测量系统一般以矢量网络分析仪为基础,而矢量网络分析仪一般只能将同轴信号通过波导同轴转换接头转换为标准矩形波导的TE10模,所以为了满足对回旋行波管高频系统的冷测实验需求,需要设计TE10到TE11、TE21以及TE02的模式变换器。本论文主要研究内容分为以下几个方面:1.介绍了高功率微波的发展及应用。重点介绍了回旋行波管的发展,说明了其结构和工作原理,阐述了不稳定性问题及介质加载高频结构的重要应用,介绍了冷测实验波导模式变换器的研究现状。2.介绍了介质材料电磁参数测量方法,重点介绍了传输反射法的原理。进行了陶瓷材料测量实验,并基于MATLAB编制了GUI界面,方便了对实验数据的处理。3.设计和仿真了TE10到TE01、TE11、TE21的模式变换器,并对其进行了实验验证,以满足冷测实验的需求。4.设计和仿真了输入耦合器和输出窗,并进行了冷测验证实验。
[Abstract]:Compared with low-frequency microwave sources, millimeter-wave sources have the advantages of high resolution, wide frequency band and concentrated energy, and have great potential in military and civilian applications.In the millimeter wave band, gyrotron traveling wave tube is an important microwave signal amplifier. It uses fast wave transversal energy transfer mode, compared with the traditional electric vacuum device, it not only has the advantages of high power and high frequency.And it has a great competitive advantage in working bandwidth. It is widely used in many national defense, such as high resolution radar, communication, electronic countermeasure, super jammer, directional energy weapon, controlled nuclear fusion, microwave heating, etc.Scientific research and industrial and agricultural production.The high frequency system of gyrotron consists of input coupler, output window and high frequency interaction structure, which has a key effect on the device. It is necessary to carry out cold test before engineering application to ensure the reliability of their performance.The cold measurement of gyrotron high frequency system is mainly about the transmission reflection performance of input coupler and output window, especially the measurement of transmission and attenuation of each mode in high frequency structure, and then the dispersion relation of high frequency structure is studied.In gyrotron TWT, the existence of competitive modes such as TE01 mode, TE11, TE21 and TE02 is the root of instability.In order to solve the instability problem, gyrotron TWT usually adopts dielectric loaded high frequency structure.The selection of dielectric material has great influence on the performance of high frequency structure, so it is necessary to measure its electromagnetic parameters accurately.The existing microwave measurement system is generally based on the vector network analyzer, and the vector network analyzer can only convert the coaxial signal into the TE10 mode of the standard rectangular waveguide through the waveguide coaxial junction.Therefore, in order to meet the need of cold test for gyrotron high frequency system, we need to design TE10 to TE11TE 21 and TE02 mode converters.The main content of this thesis is divided into the following aspects: 1.The development and application of high power microwave are introduced.This paper mainly introduces the development of gyrotron, explains its structure and working principle, expounds the problem of instability and the important application of dielectric loaded high frequency structure, and introduces the research status of cold measuring experimental waveguide mode converter.The measurement method of electromagnetic parameters of dielectric materials is introduced, and the principle of transmission reflection method is emphatically introduced.The measurement experiment of ceramic material was carried out, and the GUI interface was compiled based on MATLAB, which made it convenient to process the experimental data. 3.This paper designs and simulates the mode converter from TE10 to TE01U TE11TTE21, and verifies it experimentally to meet the requirement of cold test. 4.The input coupler and output window are designed and simulated.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN124

【参考文献】