同轴膜片加载慢波系统的研究

【作者】 岳玲娜；

【导师】 王文祥；

【作者基本信息】 电子科技大学 ， 物理电子学， 2003， 硕士

【摘要】 随着现代军事技术的发展，“高功率微波技术”形成一个新兴的技术领域并迅速地发展起来。高功率微波的重要研究领域之一是高功率微波源，而高功率微波源的核心部件是电子注与波进行互作用的场所，对行波管而言即为慢波系统，它的优劣直接影响高功率微波源的性能。文中讨论了应用于相对论行波管的同轴膜片加载圆波导慢波系统。 本文分析了同轴膜片加载圆波导和脊加载同轴膜片圆波导两种慢波系统，它们均采用全金属结构，具备尺寸大、散热性能好，易加工的特点。其有别于普通膜片加载波导的同轴结构，使得带宽得以拓展，因此很可能成为一类同时满足高功率容量和宽带要求的慢波结构。本文的主要研究工作和创新点如下： 一、首先完善了同轴膜片加载圆波导慢波系统的理论分析，得到该系统色散方程和耦合阻抗表达式，并通过数值模拟计算，详细讨论了慢波系统几何尺寸对色散特性和耦合阻抗的影响。 二、首次对同轴膜片加载圆波导注波互作用线性理论进行了研究。利用自洽场理论以及场的匹配方法，推导出此结构在小信号条件下的热色散方程，讨论了电子注参量和慢波系统几何参量与小信号增益和色散的关系。 三、创造性地提出脊加载同轴膜片圆波导慢波结构，并对其采用严格的场匹配法，详细推导了色散方程和耦合阻抗表达式，并得到一系列有关系统结构参量与色散和耦合阻抗之关系的数值模拟结果。结果表明，脊加载结构在某种程度上能提高耦合阻抗。 四、引入薄环形电子注，首次建立了脊加载同轴膜片圆波导的注波互作用线性理论，得到小信号条件下的色散方程。数值模拟了电子注参数和色散与增益的关系。 五、加工了同轴膜片加载圆波导慢波系统实验模型，用谐振法测得的色散特性与理论数据良好吻合，从而验证了同轴膜片加载圆波导慢波系统色散特性理论分析的正确性。更多还原

【Abstract】 With the progress of the modern military science and technology, ’High Power Microwave Technology’ as a new field is developed rapidly. The key component of a high-power microwave device is the RF structure in which the beam and wave interact. To Traveling Wave Tube (TWT) .it is the slow-wave structure(SWS) which basically determine the performance of the TWT. In the dissertation, the coaxial disk-loaded cylindrical waveguide used in SWS of Relativistic Traveling Wave Tube(RTWT) is discussed .The types of the coaxial disk-loaded cylindrical waveguide and the coaxial ridge-disk-loaded cylindrical waveguide are all-metal slow-wave structures and have advantages of large size, good thermal conductivity ?high precision of manufacturing and assembling. Because the coaxial structure can broaden the bandwidth, they might be one type SWS of the high power capacity and the middle bandwidth .Several major and valuable achievements are listed as the followings:1. First, the theory of the coaxial disk-loaded cylindrical waveguide SWS is analysed, and the dispersion equation and the coupling impedance of this structure are obtained. Through the numerical caculation , it is discussed that the influence of various circuit dimensions on the dispersion and the coupling impedance.2. The linear theory of the coaxial disk-loaded cylindrical waveguide TWT is built and the dispersion equation with an annular electron beam of this TWT is obtained according to self-consistent field theory and the field matching method. The computation results of the hot dispersion equation indicate the relations between the electron beam parameters and the small signal gain.3. For the first time, the coaxial ridge-disk-loaded cylindrical waveguide as SWS is presented. Its dispersion equation and the expression of coupling impedance are given by application of the field matching method. A series of numerical results show that the influence of structure dimensions on the dispersion characteristics and interaction impendance. It suggested that the ridge-loaded structure can improve thecoupling impedance in a way .4. The ’hot’ dispersion equation of the coaxial ridge-disk-loaded cylindrical waveguide TWT with an annular electron beam can be firstly obtained according to self-consistent field theory. The influence of various electron beam parameters on the small signal gain is investigated and discussed by the numerical results.5. The model of the coaxial disk-loaded cylindrical waveguide is manufactured to testify the dispersion properties of this structure. The experimental results are in good agreement with the theoretical results.更多还原