Ku波段高功率紧凑型微波输出窗的研究

发布时间：2018-05-21 21:04

本文选题：微波输出窗 + 紧凑化　；参考：《西南交通大学》2016年硕士论文

【摘要】：微波输出窗是高功率微波系统的重要组成部分,它扮演着十分重要的角色。微波输橱窗既要具备高密封性能,能承受真空与大气之间的压力,也要具有较高的功率容量。高功率微波系统正朝着高功率和紧凑化方向发展,这对应用于高功率微波系统的微波输出窗提出了更高要求。国内外研究机构都对微波输出窗开展了各方面的研究,并取得了一定的进展。现有的输出窗形式较多,且部分技术也较为成熟,但在高功率微波系统的一些特殊需求下,例如高功率微波辐射领域,系统往往对输出窗的功率容量以及紧凑化提出了双重要求。因此,本文拟探索新型高功率紧凑型微波输出窗,以满足高功率微波辐射系统的需求。本文首先对微波输出窗的分类做了简单介绍,选择采用在圆波导下进行密封的输出窗。盒型窗作为圆波导下密封的输出窗基本结构,具有结构简单、功率容量较大、技术成熟、结构紧凑等优点。因此本文以盒型窗作为研究基础,通过等效电路法和数值模拟相结合的方法对Ku波段盒型窗进行了研究与设计。其次,针对功率容量的提升需求,提出扩大中间圆波导直径的方案,并结合输出窗前后端的微波系统连接需求,采用方波导输入、圆波导输出的输出窗结构,同时设计了一种紧凑型方圆转换器。通过耦合波理论分析,设计了圆波导过渡段,并在此基础上设计了Ku波段高功率微波输出窗。随后,对输出窗进行紧凑化改进,考虑介质实际加工密封性要求及三相点对窗表面场强的影响后,对模型进行了改进和优化,采用中间双凸起的窗片结构,并对窗片表面进行刻槽处理,进一步提高了紧凑化后的输出窗功率容量。最后基于以上研究设计,对高功率紧凑型输出窗进行了结构设计与加工试制,测试得到了微波输出窗的驻波比与插入损耗,实验结果表明该窗在12.4-12.65GHz内,S11均小于0.1,插入损耗在整个频带内小于0.2dB,设计功率容量达到7.6MW,初步验证了高功率紧凑型输出窗的可行性。
[Abstract]:Microwave output window is an important part of high power microwave system, it plays a very important role. Microwave window must have high sealing performance, can withstand the pressure between vacuum and atmosphere, but also has high power capacity. The high power microwave system is developing towards the direction of high power and compactness, which puts forward higher requirements for the microwave output window used in the high power microwave system. Domestic and foreign research institutions have carried out various research on microwave output window, and have made some progress. There are many kinds of output windows, and some of them are mature, but in some special requirements of high power microwave system, such as the field of high power microwave radiation, The power capacity and compactness of the output window are often required in the system. Therefore, this paper intends to explore a new type of high power compact microwave output window to meet the demand of high power microwave radiation system. In this paper, the classification of microwave output window is introduced briefly, and the output window sealed under circular waveguide is chosen. As the basic structure of the output window sealed under the circular waveguide, the box window has the advantages of simple structure, large power capacity, mature technology and compact structure. Therefore, based on the box window, the Ku-band box window is studied and designed by the method of equivalent circuit and numerical simulation. Secondly, according to the demand of increasing power capacity, a scheme of expanding the diameter of the middle circular waveguide is proposed. The output window structure of square waveguide input and circular waveguide output is adopted in combination with the microwave system connection demand at the back end of the output window. At the same time, a compact round converter is designed. Based on the analysis of coupling wave theory, the transition section of circular waveguide is designed, and the Ku-band high power microwave output window is designed. Then, the model is improved and optimized by the compact improvement of the output window, taking into account the requirements of the sealing property of the medium and the effect of the three-phase points on the surface field strength of the window, and the structure of the window plate with the middle double protruding is adopted. Furthermore, the power capacity of the output window is further improved by grooving on the surface of the window. Finally, based on the above research design, the structure design and fabrication of the high power compact output window are carried out, and the standing wave ratio and insertion loss of the microwave output window are obtained. The experimental results show that the window S11 is less than 0.1 in 12.4-12.65GHz, the insertion loss is less than 0.2 dB in the whole frequency band, and the designed power capacity is 7.6 MW. The feasibility of the high power compact output window is preliminarily verified.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN12

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