曲折槽波导新型慢波结构的高频特性研究

【作者】 薛东海；

【导师】 王文祥；

【作者基本信息】 电子科技大学 ， 物理电子学， 2006， 硕士

【摘要】 行波管是一种低噪声、宽频带、高功率、高增益的微波器件,被广泛应用于军事雷达,卫星通信,电子对抗等领域,发挥着极其重要的作用。慢波结构是行波管的核心,决定着行波管的技术性能。随着科技的发展,人们对行波管的性能提出了更高的要求,更高的功率和带宽成为人们追求的目标,随着微波管向更高的频段发展,也要求有新型的慢波结构来提高行波管的性能。本论文以曲折波导慢波系统和槽波导传输线为基础,综合二者的优点和目前曲折波导在THz辐射振荡器中遇到的问题,提出一种新型的曲折槽波导慢波系统的概念,并对这种新型慢波结构的高频特性进行了详细的研究。本论文的主要工作和创新处有以下几点:一、绪论部分对行波管的研究历史和目前行波管慢波结构的研究进展做了概述,并对目前各国对曲折波导慢波系统的研究现状做了介绍,针对曲折波导慢波系统研制中的一些问题,给出了研制曲折槽波导慢波系统的必要性和可行性。二、分别介绍了曲折波导慢波结构和槽波导传输线的研究方法和理论进展。利用Galerkin积分方程法得到了矩形槽波导任意价精度下的本征方程,计算得到1到4价精度下的本征解,并且跟文献中的试验结果及其他方法得到的结果做了比较,结果显示,本文的结果更接近于试验数据,并且收敛速度快。三、对曲折槽波导慢波结构的色散特性和耦合阻抗进行了详细的研究,色散方程的获得是依照曲折波导慢波系统的分析方法,但耦合阻抗的计算公式是严格按照场论的方法得到的。此外,我们还利用MATLAB编写了相应的计算程序,研究了结构参数的变化对曲折槽波导慢波系统高频特性的影响。四、作为一种辅助的分析方法,本文还利用CST MICROWAVE STUDIO对曲折矩形槽波导慢波系统的高频特性做了模拟仿真,得到了色散曲线和耦合阻抗,与理论结果符合很好。更多还原

【Abstract】 As a low noise, broadband, high power and high gain microwave vacuum tubes, Traveling Wave Tubes (TWTs) have been widely used in military radars, satellite communications and electronic confrontations, which play an important role in modern electronic equipments. The slow-wave structure (SWS), as a key part of TWT where the beam-wave interaction carries out for exciting microwave energy, determines its performance directly. With the development of techniques, novel slow-wave structures are needed to improve the performance of TWT with higher power and wider bandwidth. In this paper, a novel folded groove waveguide slow-wave structure is proposed with the foundation of folded waveguide and grooved guide. High frequency characteristics of such SWS are also analyzed in this paper. The main works are listed as follows:1. The development history, present research situation of TWTs and SWS are introduced in the first part. As a kind of all-metal SWS, the serpentine waveguide has been investigated thoroughly. When worked in high frequency, folded waveguide SWS still shows some problems, i.e., hardly fabrication and higher ohmic loss. In this situation, folded groove guide SWS is proposed and studied in this dissertation.2. The research methods of serpentine waveguide and groove guide have been introduced. Eigen equation of rectangular groove guide is obtained by Galerkin boundary integration equation method. More accurate results are got with four-order approximation, which show good convergence and better agreement with experimental data when compared with previously published papers.3. The dispersion characteristics and interaction impedance of the groove guide SWS are analyzed theoretically in detail. By use of MATLAB, numerical programs are compiled to get dispersion curves and impedance diagrams. The influence of geometrical dimensions on the dispersion characteristics and interaction impedance are discussed.4. As an assistant analysis, CST MICROWAVE STUDIO is applied to simulate dispersion characteristics and interaction impedance of rectangular groove guide. Simulation show better agreement with theoretical results.更多还原