中科院电子所空间行波管仿真设计软件IESTWT

基于三维大信号注波互作用模型开发了空间行波管高频系统仿真设计软件,针对无翼片加载的T形杆、矩形杆、圆形杆和扇形杆夹持的螺旋线空间行波管,具有计算速度快、副特性预测精确的优点,已应用于多种管型的研制中。     

毫米波行波管金刚石夹持高频结构的设计和优化

利用TWTCAD软件和美国一维螺旋线行波管大信号计算程序对金刚石夹持高频结构和氧化铍高频结构进行了模拟计算,模拟结果表明采用金刚石作为夹持材料可以大大提高高频结构的耦合阻抗和电子效率,同时在采用非均匀输出线路设计时,金刚石结构对电子效率的提高更为明显。     

毫米波螺旋线行波管慢波系统高频损耗

基于夹持杆分层螺旋带模型和三维电磁场分析研究了毫米波螺旋线行波管慢波系统的导体和介质损耗。螺旋带模型中介质损耗考虑为纵向传播常数的虚部,给出螺旋带中电磁场的解析解,导体损耗由螺旋线和管壳表面的面电流不连续性获得。三维电磁场分析通过本征模法,求解单周期结构的品质因数和周期储能获得有限导电率导体和夹持杆陶瓷损耗角带来的慢波系统高频损耗。结果表明,毫米波段螺旋线的导体损耗和夹持杆的介质损耗远大于管壳导体损耗,介质损耗与陶瓷损耗角呈线性关系,对高频损耗的影响不可忽略。     

理论分析毫米波螺旋线行波管慢波系统导体和介质损耗

该文基于夹持杆分层螺旋带模型和3维电磁场模型分析,详细研究了毫米波螺旋线行波管慢波系统的导体和介质损耗。螺旋带模型中介质损耗考虑为纵向传播常数的虚部,给出电磁场的解析解,导体损耗由螺旋线和管壳表面的面电流不连续性获得。3维电磁场模型分析通过本征模法,求解单周期结构的品质因数和周期储能,获得有限导电率导体和夹持杆陶瓷损耗角带来的慢波系统高频损耗。结果表明,毫米波段螺旋线的导体损耗和夹持杆的介质损耗远大于管壳导体损耗,介质损耗与陶瓷损耗角呈线性关系,对高频损耗的影响不可忽略。     

螺旋线毫米波行波管及宽带毫米波功率模块的研制进展

本文介绍了中国电科12所K、Ka波段螺旋线行波管及毫米波功率模块研制进展情况,包括宽带行波管及毫米波功率模块,大功率通信/雷达用行波管、幅相一致行波管。目前已实现Ka波段小型化的宽带行波管及毫米波功率模块输出功率大于160 W;Ka波段幅相一致行波管相位一致性达到±25°;大功率毫米波行波管已形成系列化产品。     

螺旋线行波管慢波结构热特性计算专用软件开发

针对行波管慢波结构热分析的必要性,介绍了螺旋线慢波结构的热产生机理,结合ANSYS软件设计了可对不同翼片加载和不同形状夹持杆的螺旋线慢波结构进行热特性分析的专用仿真环境。利用该仿真环境,用户可以在不掌握ANSYS软件的情况下对螺旋线行波管慢波结构的热特性进行模拟计算。     

夹持杆材料对螺旋线慢波组件散热性能的影响

慢波组件是螺旋线行波管的关键组成部分,它的性能优劣直接决定着整管水平.本文利用无变形热挤压方法制备了不同材料夹持杆的慢波组件.分析比较了不同夹持杆对慢波组件散热性能的影响.介绍了将金刚石应用于螺旋线慢波组件的研究.     

基于MAFIA软件的螺旋线慢波结构冷特性仿真

利用MAFIA软件所提供的准周期边界条件,对两种不同夹持结构的螺旋线行波管一个周期结构的色散和耦合阻抗特性进行了仿真,并与国内开发的螺旋线行波管计算软件包的计算结果进行了比较,为今后进一步优化螺旋线行波管的慢波结构打下基础.     

形杆夹持翼片加载螺旋线的色散特性

Ｖ形杆夹持、翼片加载的螺旋线慢波结构很适合于宽频带行波管应用。本文对不同的翼片加载结构的色散特性进行了计算，计算数据与实验测量结果一致性较好。最后讨论了Ｖ形杆与圆形杆夹持时的介质负载和色散特性。     

Ka波段宽带螺旋线行波管研制

主要针对Ka波段宽带高功率螺旋线行波管慢波结构进行了优化设计,旨在提高行波管输出功率和效率,并对返波振荡特性进行了仿真分析。行波管测试结果表明,在工作频段26.5～40 GHz,连续波输出功率大于200 W,总效率超过41%,增益大于31.5 dB。该管可作为Ka波段大功率毫米波功率放大器,应用于各类军事和民用电子系统中。     

Study of Novel Slow Wave Circuit for Miniaturized Millimeter Wave Helical Traveling Wave Tube

Two kinds of novel helical slow wave circuit, supported by Chemical Vapor Deposition (CVD) diamond, are presented. They are applying in miniaturized millimeter wave helical traveling wave tube. Cold test characteristic of these circuits are simulated by MAFIA code. Higher performances are achieved with smaller size, compared with conventional circuit supported by BeO rods. The nonlinear analysis is implemented by Beam and Wave Interaction (BWI) module, which is a part of TWTCAD Integrated Framework. Results have been found to be consistent with the expectation. It should be wider apply in microwave and millimeter wave vacuum electronic devices.     

折叠波导慢波电路的传输特性

研究了新型慢波结构折叠波导慢波电路的传输特性 ,利用等效电路法计算了折叠波导电路的色散特性、耦合阻抗和止带。分析和计算表明 ,该电路很适合用作短厘米波和毫米波大功率行波管的慢波结构。     

Diamond-studded helical traveling wave tube

A novel method of millimeter-wave traveling wave tube (TWT) slow-wave circuit fabrication, employing laser micromachining and the in situ growth of diamond studs as an insulating dielectric, has been developed, which would enable a new class of very wideband, low distortion, high-efficiency amplifiers. Because the slow-wave circuit is supported by an array of diamond studs, rather than the conventional dielectric rods, we have named this novel device the diamond-studded TWT. Diamond strips have been successfully grown on a molybdenum tube and a diamond-studded helix has been produced using laser micromachining. Computer analysis of the slow-wave structure indicate that this fabrication technique leads naturally to a circuit with nearly flat dispersion over a frequency range, in some configurations, of more than four octaves. Typically, wide bandwidth can only be achieved by reducing efficiency; however, this fabrication technique increases the interaction impedance of the circuit, enabling high efficiency operation without sacrificing bandwidth. The very low dispersion also results in a coupling impedance that is relatively insensitive to frequency that may enable low reflection coupling over a wide frequency band. The resulting slow-wave circuit is essentially a brazed structure and, therefore, inherently robust thermally and mechanically. The manufacturing technology being pursued is applicable to any millimeter-wave helical or helix-derived TWT.     

Performance and Application of Slow Wave Circuits for Power TWT in Millimeter Wave

In millimeter wave range, high-power traveling wave tube (TWT) is a key device with broadband and high-power amplification. Basis of comparing traditional and new type slow wave circuits for high-power TWT in MMW, analysis and computation of propagating and RF performance for folded wave circuit are carried out. Theoretic calculation and experimental test show that folded wave circuit is an ideal slow wave structure for broadband and high-power TWT in MMW. There is extreme wide application for the circuit in high-power TWT. This development possesses important consult value to designer for MMW power amplifiers.     

曲折波导慢波电路的特性

矩形曲折波导具有机械强度高，容易加工，热性能好以及工作频带宽等优点。文中对曲折波导的色散特性和互作用阻抗进行了计算。并指出，将曲折波导应用于毫米波行波管作为其慢波电路，可解决大功率、宽频率和难加工的问题。     

行波管夹持杆微波等离子体化学气相沉积金刚石厚膜改善散热性能研究

采用微波等离子体化学气相沉积法在行波管Al₂O₃夹持杆上沉积金刚石厚膜,取代传统有毒的氧化铍陶瓷杆,用于宽带大功率行波管改善其散热性能.经材料性能测试,慢波组件装配及性能测试,获得了较好的实验结果:导热率大于12W/cm.℃,介电常数为5.0~5.5,介质损耗为1×10^-3,体积电阻率大于10¹³Ω/cm; 慢波组件导热性能与同结构的BeO组件相比提高3.0倍.整管冷测参数全部合格;整管热测在C波段测得Po=95W,G=35db.     

Study of Propagating Characteristics for Folded Waveguide TWT in Millimeter Wave

Folded waveguide circuit (FWC) is an ideal slow wave structure for broadband power traveling wave tube (TWT) in millimeter wave. But owing to changes of propagating character by reflecting of waveguide bend and electron beam hole, stopband can be formed. On the basis of computation of the stopband, effects of the dimension of FWC on stopband width are analyzed. It is available for design in FWC TWT.     

提高宽带毫米波行波管效率研究

针对影响宽带毫米波行波管效率的主要因素,对提高行波管效率的相关实用化技术进行了研究。通过螺旋线线路渐变技术、降低高频损耗、多级降压收集极三个方面的研究,使现有某一宽带毫米波行波管总效率由原来的10%提高到20%以上。