共查询到17条相似文献,搜索用时 87 毫秒
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螺旋带色散特性和耦合阻抗的精确计算 总被引:1,自引:0,他引:1
应用一种改进的计算螺旋带色散和耦合阻抗的方法,对面电流密度进行Chebyshev多项式展开后,去除了螺旋带上的面电流密度假设。在介质的高阶径向分层时为了避免高阶矩阵的求逆运算,采用转移矩阵和连接矩阵处理边界的场匹配。编写可径向任意分层的普适性程序,计算了螺旋线行波管的一些典型结构。研究表明:该理论的计算结果与实验结果有很好的一致;谐波次数以及面电流Chebyshev展开的项数完全可以依据结果的收敛性进行选取;分层的数目主要与结构的径向规则程度有关,径向越不规则,所要求的分层数目越多。 相似文献
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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. 相似文献
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一种新型圆弧形螺旋槽慢波结构的色散特性 总被引:2,自引:0,他引:2
本文提出了一种新型的大功率行波管慢波结构-圆弧形螺旋槽系统;采用近似的场论方法,得到了该结构的色散方程;讨论了主模在其中的传播情况和系统结构参数变化对色散特性的影响。 相似文献
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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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Mukesh Kumar Alaria A. Bera A. K. Sinha V. Srivastava 《Journal of Infrared, Millimeter and Terahertz Waves》2009,30(3):211-216
This paper describes the analysis of helix slow-wave structure (SWS) for a high efficiency space traveling wave tube that
is carried out using Ansoft HFSS and CST microwave studio, which is a 3D electromagnetic field simulators. Two approaches
of simulating the dispersion and impedance characteristics of the helix slow wave structure have been discussed and compared
with measured results. The dispersion characteristic gives the information about axial propagation constant (Beta). Which
in turn yields the phase velocity at a particular frequency. The dispersion and impedance characteristics can be used in finding
the pertinent design parameters of the helix slow-wave structure. Therefore a new trend has been initiated at CEERI to use
Ansoft HFSS code to analysis of the helix slow wave structure in its real environment. The analysis of the helix SWS for Ku-band
140W space TWT has been carried out and compared with experimental results, and found is close agreement. 相似文献
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Lu Zhigang Wei Yanyu Gong Yubin Wu Zhoumiao Wang Wenxiang 《电子科学学刊(英文版)》2007,24(3):384-389
This paper focuses on a new rectangular waveguide grating Slow-Wave Structure (SWS) with cosine-shaped grooves and studies the propagation characteristics of the wave in the SWS. By using the approximate field-matching conditions, the dispersion equation and the coupling impedance of this circuit are obtained. The dispersion curves and coupling impedances of the fundamental wave are calculated and the influences of the various geometrical dimensions are discussed. The results show that the bandwidth of the cosine-shaped groove SWS is much wider than that of rectangular-shaped groove one. And reducing the groove width can broaden the frequency-band and decrease the phase-velocity, while increment of the groove-depth can also decrease phase-velocity. For above cases, the coupling impedance is more than 16Ω. The present analysis will be helpful on further study and design of the RF systems used in millimeter wave Traveling Wave Tube (TWT). 相似文献
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该文利用三维电磁仿真软件模拟计算了THz圆波导梳状慢波结构的负1次返波的色散和耦合阻抗。结果证实:在430-570GHz频带内,慢波结构内半径为0.175mm,约为中心频率波长的0.292倍;在760-940GHz的频带内,慢波结构内半径为0.1mm,是中心频率处波长的0.392倍。该结构较大的径向尺寸有利于提高电子注通过率。这种结构负1次返波的耦合阻抗较小,基本上小于1 ,很好解释了现有THz返波管的电子效率小于0.01%的事实。 相似文献