太赫兹扩展互作用振荡器的矩形耦合腔特性研究

本文选用矩形耦合腔作为太赫兹扩展互作用振荡器(EIO)的慢波结构,鉴于其结构的复杂性,采用等效电路方法计算其色散.详细研究了腔体和耦合槽的电路参数,计算了不同结构尺寸、圆形和矩形电子通道的0.12THz和0.225THz慢波结构的色散特性.并采用专业电磁软件,研究了不同结构参数下的色散特性、耦合阻抗和特征阻抗.通过对色...     

螺旋耦合翼片慢波结构的研究

本文分析了螺旋耦合翼片慢波结构,给出了该结构的色散特性及耦合阻抗的理论公式。其理论计算与实测值一致性较好。文中还讨论了慢波结构几何形状的变化对色散特性及耦合阻抗的影响。     

翼片加载螺旋线慢波结构色散和耦合阻抗的测量与模拟

运用非谐振微扰法，利用Aglient8510C矢量网络分析仪对两个不同翼片加载螺旋线慢波结构的色散和耦合阻抗特性进行了测试。运用HFSS软件对实验中两个被测的螺旋线慢波结构进行建模，分别计算了它们的色散和耦合阻抗特性，在模拟中考虑了空间谐波对耦合阻抗的影响。结果表明，模拟与实验的色散和耦合阻抗有较好的一致性。     

螺距对螺旋慢波系统色散和耦合阻抗的影响

螺距是慢波系统的一个重要参数,直接影响螺旋慢波系统的色散特性和耦合阻抗.严格求解螺距对慢波系统色散和耦合阻抗的影响是不方便的,而通过计算机模拟可以方便快速地研究螺距对慢波系统色散和耦合阻抗的影响.模拟结果表明,对于工程项目当螺距变化小于4%时,螺距对色散和耦合阻抗的影响是很小的.     

毫米波返波管用梳形慢波结构特性的计算

梳形线慢波系统与其他慢波系统相比,尺寸较大,易于加工,散热性好,很适宜用作毫米波返波管的慢波结构。由场匹配法得到的梳形线基波色散特性是超越方程,利用计算机求解这一方程,得到了梳形线的返波色散特性和耦合阻抗,并讨论了梳形线的尺寸对色散和耦合阻抗的影响,为设计梳形线毫米波返波管提供了理论依据。     

脊加载同轴径向线慢波结构设计

提出脊加载同轴径向线慢波结构,并用高频结构仿真器(HFSS)电磁仿真软件对其色散特性和耦合阻抗进行研究,分析了不同结构参数变化对其高频特性的影响。结果表明:脊加载同轴径向线慢波结构的色散曲线平坦,减小内径和周期长度可以明显降低慢波结构的相速,从而减小工作电压;加载脊的宽度对耦合阻抗的影响明显,随着加载脊宽度的增加,耦合阻抗得到提高,相速减小;加载脊的长度对结构的色散特性和耦合阻抗影响不明显;这种脊加载方式有利于增加慢波结构的耦合阻抗,提高行波管的增益和效率。脊加载同轴径向线慢波结构是一种全金属结构,工作频带宽,散热性能好,在毫米波波段的行波管中有较好的应用前景。     

利用MAFIA软件模拟耦合腔慢波结构的冷测特性

利用MAFIA软件对休斯结构的耦合腔慢波结构的色散特性和耦合阻抗进行了模拟,同实验数据相比,其计算精度是令人满意的,从而为耦合腔行波管的生产和研发提供了一个便捷而有力的工具.     

任意槽形矩形慢波结构高频特性分析

矩形慢波结构及其变态具有易于微加工、横向尺寸大、散热好等优点,是一种有潜力工作于毫米波段或亚毫米波段的高频系统.文中利用场匹配的方法推导出了任意槽形状开放式矩形波导慢波结构的统一色散方程,并利用数值计算方法分析了几种特殊槽形状加载慢波结构的色散特性及耦合阻抗,得到三角形结构色散和耦合阻抗均最弱,而倒梯形结构色散最强,耦合阻抗最大.     

毫米波段梳形慢波线色散特性和耦合阻抗的场匹配法计算

在毫米波段，梳形线慢波系统与其它慢波系统相比，尺寸较大，易于加工，散热性好，很适宜用作毫米波返波管的慢波结构。本文通过对用场匹配法分析了梳形线色散特性的耦合阻抗，讨论了梳形线的尺寸对其色散和耦合阻抗的影响，为设计梳形线毫米波返波管提供了理论依据。     

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。     

W波段V型曲折矩形槽波导行波管的模拟研究

分析了一种新型慢波线-V型曲折矩形槽波导慢波结构,利用电磁仿真软件CST及HFSS对其高频特性进行了模拟计算,并在此基础上设计了工作在W波段的V型曲折矩形槽波导行波管的互作用结构.利用CST粒子工作室对其注-波互作用特性进行了模拟分析.结果表明:W波段V型曲折矩形槽波导行波管能够有效放大微波信号,且频谱纯净.     

The Analysis of Hole-Gap Helical Groove Waveguide

The hole-gap helical groove waveguide, as a all-metal slow-wave circuit, has advantages of good heat dissipation and great size, and thus is suitable for use of mm TWT. By means of an approximate field theory, the expressions of the dispersion equation and the coupling impedance of the hole-gap helical groove waveguide is obtained in this paper. The influence of various circuit dimensions on the dispersion relation and the coupling impedance is discussed by the numerical computation.     

Analysis of the Coaxial Ridge-Loaded Helical Groove Waveguide

The coaxial ridge-loaded helical groove waveguide is proposed in this paper. As an all-metal slow-wave circuit, it has advantages of good heat dissipation and great size, and thus is suitable for use of millimeter TWT. By means of field theory, the expressions of the dispersion equation and the coupling impedance of the coaxial ridge-loaded helical groove waveguide are obtained. The influence of various circuit dimensions on the dispersion relation and the coupling impedance is investigated by the results of numerical computation.     

三维螺旋慢波电路的精确的冷测模拟

利用MAFIA的准周期边界条件对螺旋慢波电路的高频特性进行模拟,发现模拟结果在一定的网格取值范围内作微小变化,在此基础上使得色散曲线趋于数值收敛;并提出利用MAFIA后处理模块直接计算耦合阻抗的方法;将模拟计算结果与实验测试值进行比较,其平均误差范围达到设计要求,为软件模拟的精确计算作了一些有益的研究.     

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.     

Slow-Wave Characteristics of a Frame–Rod Structure Based on Micro-Fabricated Technology for THz Vacuum Electron Devices

A simple equivalent circuit analysis of the frame–rod slow-wave structure (SWS) on dielectric substrates of a traveling-wave tube (TWT) is developed, using the quasi-TEM approximation approach for the dispersion and coupling impedance characteristics of the structure. Moreover, the obtained complex dispersion equation and coupling impedance are numerically calculated. The calculation results by our theory method agree well with the results obtained by the 3D EM simulation software HFSS. It is shown that the dispersion of the frame–rod circuit is decreased; the phase velocity is reduced and the bandwidth becomes greater, while the coupling impedance decreases after filling the dielectric materials in the frame–rod SWS. In addition, a comparison of slow-wave characteristics of this structure with a rectangular helix counterpart is made. As a planar slow-wave structure, this structure has potential applications in compact TWTs based on the micro-fabrication technology, which could be scaled to millimeter wave, even to THz frequency.     

CST MWS软件模拟三维螺旋线慢波结构

本文介绍了用CST MWS软件的周期边界条件计算行波管螺旋线慢波结构的色散和耦合阻抗等冷测特性的方法,用采取螺旋带模型的理论分析计算结果和实验测试值加以验证,取得了比较一致的结果;并应用这种MWS的模拟方法和螺旋带模型的计算方法分析了具有扇形和T形夹持杆慢波结构的冷测特性,结果表明,相速和耦合阻抗都随着扇形角度的增大而减小,随着T形窄端宽度的增加而减小,随着T形窄端高度的增加而增大.     

多注行波管慢波结构的色散特性分析

多注行波管是一种具有工作电压低、瞬时工作带宽宽、容易实现大功率等优点的新型微波器件;本文主要利用CST Microwave Studio软件对多注行波管慢波结构的色散特性进行设计计算,并将计算结果和实验值进行比较分析。结果表明,计算值和实验值基本吻合。     

微带型曲折线慢波结构冷测特性的计算机仿真

在研究了微带型曲折线慢波结构色散特性、耦合阻抗等特性参数的分析方法基础上，利用电磁场仿真软件MAFIA和Microwave Studio对其进行模拟计算。对影响慢波电路特性的结构参数如微带宽度和微带厚度对其冷测特性的影响进行了仿真和分析，同时对介质杆支撑的曲折线慢波电路进行了分析。结果表明，微带宽度对其特性影响较为显著而微带厚度的改变影响不大，介质杆代替介质板使慢波电路的特性参数产生了较大的变化。     

0.85THz可调谐式折叠波导再生反馈真空电子学振荡器的理论及实验研究

本文提出了一种适用于850 GHz太赫兹波成像系统的可调谐再生反馈振荡器。使用UV-LIGA微加工工艺制作慢波结构,可满足折叠波导在太赫兹频段的尺寸需求。使用CST微波工作室对折叠波导色散特性进行设计,同时针对于行波管和再生反馈振荡器中折叠波导的结构,阐明了影响频率调谐的因素。此外,对带衰减的反馈回路进行仿真模拟,并使用三维粒子模拟验证了整体设计。改变电子注电压可实现振荡频率可调,振荡从单频状态逐渐变为多频状态,整体输出功率均大于200 mW。