發(fā)布時間：2018-04-18 00:23

  本文選題：回旋行波管 + 模式變換��； 參考：《電子科技大學》2017年碩士論文

【摘要】：毫米波源相對于低頻微波源而言,具有分辨率高、寬頻帶、能量集中等優(yōu)勢,在軍事上以及民用上都有很大的發(fā)展?jié)摿�。而在毫米波頻段,回旋行波管是重要的微波信號放大器,它采用快波橫向換能的工作方式,相比于傳統(tǒng)的電真空器件,不僅具有高功率和高頻率的優(yōu)點,并且在工作帶寬方面有著很大的競爭優(yōu)勢,被廣泛應用于高分辨雷達、通信、電子對抗、超級干擾機、定向能武器、受控核聚變以及微波加熱等多個國防、科學研究和工農業(yè)生產領域�；匦胁ü艿母哳l系統(tǒng)一般包括輸入耦合器、輸出窗和高頻互作用結構,對器件有著關鍵影響,必須在工程應用前,對它們進行冷測實驗以確保其性能的可靠。對回旋行波管高頻系統(tǒng)的冷測主要是對輸入耦合器和輸出窗的傳輸反射性能的測試,尤其是對高頻結構中各模式的傳輸和衰減的測量,進而研究高頻結構的色散關系�；匦胁ü芤话阌肨E01模作為工作模式。TE11、TE21以及TE02等競爭模式的存在是不穩(wěn)定性問題的根源。為了解決不穩(wěn)定性問題,回旋行波管一般采用介質加載高頻結構。介質材料的選取對高頻結構的性能有著很大影響,必須對其電磁參數(shù)進行準確測量�，F(xiàn)有的微波測量系統(tǒng)一般以矢量網(wǎng)絡分析儀為基礎,而矢量網(wǎng)絡分析儀一般只能將同軸信號通過波導同軸轉換接頭轉換為標準矩形波導的TE10模,所以為了滿足對回旋行波管高頻系統(tǒng)的冷測實驗需求,需要設計TE10到TE11、TE21以及TE02的模式變換器。本論文主要研究內容分為以下幾個方面:1.介紹了高功率微波的發(fā)展及應用。重點介紹了回旋行波管的發(fā)展,說明了其結構和工作原理,闡述了不穩(wěn)定性問題及介質加載高頻結構的重要應用,介紹了冷測實驗波導模式變換器的研究現(xiàn)狀。2.介紹了介質材料電磁參數(shù)測量方法,重點介紹了傳輸反射法的原理。進行了陶瓷材料測量實驗,并基于MATLAB編制了GUI界面,方便了對實驗數(shù)據(jù)的處理。3.設計和仿真了TE10到TE01、TE11、TE21的模式變換器,并對其進行了實驗驗證,以滿足冷測實驗的需求。4.設計和仿真了輸入耦合器和輸出窗,并進行了冷測驗證實驗。
[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.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN124

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本文編號：1765983