共查询到19条相似文献,搜索用时 171 毫秒
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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。 相似文献
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W波段阶梯型交错双栅慢波结构行波管的研究 总被引:1,自引:1,他引:0
为了提高传统交错双栅慢波结构行波管的性能,提出了一种阶梯型交错双栅慢波结构,并基于此新型慢波结构,提出了新型输入输出耦合结构.在此基础上,设计了一只工作在W波段的带状电子注阶梯型交错双栅慢波结构行波管.计算结果显示,阶梯型交错双栅慢波结构行波管的耦合阻抗更高,从而使行波管在更短的互作用电路长度里,实现更高的饱和增益和互作用效率.在90~100GHz频率范围内,阶梯型交错双栅慢波结构的耦合阻抗大于4Ω,高于传统交错双栅慢波结构;W波段带状电子注行波管高频结构的反射系数(S11)小于-15dB;并且行波管的饱和输入功率仅约为0.7W,可以实现最高输出功率约800W,相应的效率大于7.8%,增益大于30.6dB. 相似文献
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26.5-40GHz 高效率宽带毫米波行波管高频系统仿真设计 总被引:1,自引:1,他引:0
优化高频系统慢波结构参数,分析了慢波结构的材料及T 型夹持杆对高频损耗的影响,设计了一种未加载翼片结构的双渐变螺线26.5-40GHz 40W 宽带行波管,试验测试宽频带内电子效率超过12%,采用4 级降压收集极后总效率大于37%。 相似文献
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研究了一种新的开放式圆柱光栅周期结构,该结构可以作为Smith-Purcell自由电子激光和相对论行波管中的慢波结构.采用近似的场论方法,用一系列相连的矩形阶梯来近似代替光栅上任意槽形的槽的连续轮廓,利用各阶梯面上导纳的匹配,以及槽与互作用区的连续和匹配条件,获得了任意形状槽圆柱光栅周期结构的色散方程,并讨论了系统结构参数变化对系统色散特性的影响.利用软件MAGIC对结构的色散特性进行了二维模拟,与理论计算得到的值符合良好. 相似文献
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为了克服单模近似法(SMA)在分析矩形栅慢波系统高频特性的局限性,用“本征函数法”得到了其色散特性,进而求得耦合阻抗.并针对矩形栅的两种典型结构(浅槽栅和深槽栅)进行数值计算,分析了金属栅的几何尺寸对系统高频特性的影响.设计出3 cm、8mm波段的矩形栅模型,进行实验测量,实验值与理论值符合良好.导出了考虑电子注时的“热”色散方程,得到其小信号增益,讨论了电子注参数和慢波电路几何尺寸对小信号增益的影响,为矩形栅慢波系统行波管的设计提供了理论基础. 相似文献
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Lu Zhigang Gong Yubin Wei Yanyu Huang Yu Wang Wenxiang 《Journal of Infrared, Millimeter and Terahertz Waves》2006,27(6):791-807
The rectangular waveguide grating slow-wave structure (SWS) with arbitrary shaped grooves is presented and analyzed in this paper. As an all-metal slow-wave circuit, it has properties that can be used in high-power millimeter-wave or sub-millimeter wave traveling wave tube (TWT). The unified dispersion equation and the expression of coupling impedance are obtained in this paper by means of an approximate field-theory analysis, in which the profile of the groove is approximately replaced by a series of steps and the field continuity at the interface of two neighboring steps together with the field matching conditions at the interface between the groove region and the interaction region are employed. A rectangular groove SWS was manufactured and the cold measurement was made. The experimental data are in good agreement with the numerical calculation. The derived transcendental equations are resolved numerically for four classical structures such as rectangular, dovetail, ladder and cosine. Finally, taking the rectangular waveguide grating SWS with rectangular grooves for example, the influences of physical dimensions on dispersion relation and coupling impedance are discussed. 相似文献
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三腔分离腔振荡器高频特性分析 总被引:5,自引:0,他引:5
本文详细研究了三腔分离腔振荡器的高频特性,从圆柱坐标系下的Borgnis位函数的齐次标量Helmholtz方程出发,引入慢波驻波概念及其场表达式,利用Borgnis位函数的边界条件及相邻子区公共界面上的场匹配条件,导出了三腔分离腔振荡器内角向均匀TM模的色散关系及场分布,求得的谐振频率与实验中测得的微波频率一致. 相似文献
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该文从圆柱坐标系下的Borgnis位函数的齐次标量Helmholtz方程出发,引入慢波驻波概念及其场表达式,利用Borgnis位函数的边界条件及相邻子区公共界面上的场匹配条件,导出了三腔分离腔内角向均匀TM模的色散关系,并利用色散关系分析了三腔分离腔的结构尺寸对谐振频率的影响。 相似文献
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An induction heating system aimed at improving the characteristics of high-frequency power supplied from the high-frequency, inverter to the parallel resonant load circuit is proposed, and its transmission efficiency is studied. In this system, high-frequency power can be supplied by lowering the effect of the inductance component accompanied by wiring between the inverter circuit and the resonant load circuit. Impedance matching between the inverter and the resonant circuit and high-efficiency power transmission from the inverter to the load circuit are possible. If a flexible coaxial cable is used as the distributed constant line, it is easy to cope with the case in which comparative distance exists between the inverter part and the heating part or the case in which the heating part is moved 相似文献
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The high-frequency dielectric logging tool is analyzed, using first-principle electromagnetic field analysis, to determine characteristics such as tool behavior during measurement in a well logging environment. The theoretical model, a composite boundary value problem, consists of a source backed by an infinite ground plane (the measurement tool) in front of a two-dimensional inhomogeneity (geologic formation) which is divided into regions. The solution in each region is treated analytically in two dimensions, and numerically in one dimension. The one-dimensional problem is solved using the finite-element method, resulting in a conventional eigenvalue problem. This allows the eigenmodes of each region to be found systematically. Once the eigenmodes are found in each region, the solution for the two-dimensional inhomogeneity is obtained by matching boundary conditions at a discontinuity as in the method of mode matching. This gives the reflection and transmission operators characterizing each discontinuity 相似文献