共查询到17条相似文献,搜索用时 140 毫秒
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计算了螺旋槽波导的色散特性和群速度,用“准周期边界条件”方法和谐振法模拟计算了螺旋槽波导的色散特性,两种方法的模拟结果与计算都比较一致。此外,还模拟测试了渐变与规则螺旋槽波导连接的匹配性能、螺旋槽波导高频系统的传输特性。结果表明,螺旋槽波导是非常适用于回旋行波管的高频结构。 相似文献
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槽波导是一种很有前途的毫米波传输结构。本文用模匹配法分析了单槽波导和非对称双漕波导的色散特性,给出了n阶近似的色散方程的一般公式,据此编制了求解单槽波导和非对称双槽波导色散特性的通用程序,利用该程序对若干单槽和非对称双槽波导色散特性进行了计算,并与已有的数据进行了比较,获得了十分一致的结果,从而证实了所给公式和程序的正确性和可靠性。 相似文献
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二维周期结构色散特性的矢量理论分析 总被引:1,自引:1,他引:0
在矢量衍射理论基础上给出了任意斜入射下二维周期结构(网格光栅)的角色散表达式。研究表明,二维周期结构的色散特性分析可以将一维光栅涵盖在其中。并阐述了(m,0)级和(0,n)级衍射波的角色散彼此不相关的独立性原理。 相似文献
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阶梯加载矩形波导栅慢波系统的研究 总被引:2,自引:2,他引:2
提出了一种新型的毫米波行波管慢波结构———阶梯加载矩形波导栅慢波系统.考虑槽区内场的高次项,利用各阶梯相邻面的阶跃条件以及互作用区和加载区的场匹配条件,获得了该结构的色散方程,并导出耦合阻抗.讨论了主模在其中的传播情况,并分析了系统结构参数变化对慢波电路高频特性的影响.数值计算表明加载阶梯的尺寸对此结构内波的传播特性有很大影响,可以根据不同的要求来选取具体设计参数.该结果为进一步研究和设计此类行波管高频系统提供了理论基础. 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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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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T. A. Karetnikova A. G. Rozhnev N. M. Ryskin G. V. Torgashov N. I. Sinitsyn Yu. A. Grigoriev A. A. Burtsev P. D. Shalaev 《Journal of Communications Technology and Electronics》2016,61(1):50-55
A traveling-wave tube of the millimeter range belonging to the short-wavelength region with a sheet electron beam and a slow-wave structure of the double grating type is studied. Its dispersion characteristics and coupling impedances for various spatial harmonics are calculated. The issues of design of the electron-optical system are discussed. The focusing of a sheet electron beam with a high current density by a uniform magnetic field is modeled. 相似文献
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从理论上详细研究了一维亚波长金属光栅的凹槽深度对太赫兹伪表面等离子的影响。分别对一维标准亚波长金属光栅和缺陷亚波长金属光栅进行了研究。电场分布情况采用了COMSOL软件进行模拟。得到的结论是:对于一维标准亚波长金属光栅,沿金属光栅传播的表面等离子体取决于槽深度,较深的槽具有更强的束缚能力;对于具有缺陷的光栅结构,电场强度的分布特点取决于缺陷槽的深度,这归功于缺陷槽对光的反射和散射。基于这一理论研究,这两种不同的亚波长金属光栅结构能为太赫兹器件如波导、衰减器及滤波器发展提供新的途征。 相似文献
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Yu-Bin Gong Yan-Yu Wei Hong-Tao Liu 《Journal of Infrared, Millimeter and Terahertz Waves》2010,31(12):1412-1421
The dielectric-rod is loaded on the central axis of the arbitrarily-shaped helical groove slow-wave structure. Meanwhile,
the profile of the groove is replaced by a series of continuous rectangular steps. The unified dispersion equation of the
arbitrarily-shaped helical groove waveguide loaded with a concentric dielectric-rod is obtained by means of a combination
of filed-matching method and admittance-matching technique. Then, the effect of the change of groove shape and the dielectric-rod
parameters on the dispersion and coupling impedance is approached by theory calculation. The results show that: loaded with
dielectric-rod, the bandwidth of the helical groove traveling wave tube (TWT) is effectively broadened, but the coupling impedance
is reduced. Among the five different groove shapes, the triangle-type groove has the widest bandwidth but the smallest coupling
impedance, and the swallow-tailed-type groove has the narrowest bandwidth but the largest coupling impedance. 相似文献