共查询到17条相似文献,搜索用时 109 毫秒
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对曲折圆形槽波导新型慢波系统的高频特性进行了研究,通过理论分析和数值计算,得到了它的色散曲线和耦合阻抗表达式,并分析了结构参数变化对色散特性和耦合阻抗的影响。研究表明:当周期变小时色散减弱,耦合阻抗增加;而增大直波导长度时色散变弱,但同时耦合阻抗也会下降。因此较小的周期有利于改善曲折圆形槽波导慢波电路的高频特性。鉴于这种电路的耦合阻抗较低,可以适当地减小直波导长度来提高耦合阻抗。曲折槽波导结合了曲折波导散热能力强、色散特性好、容易加工和槽波导单模工作、低损耗、大尺寸等优点,在毫米波及亚毫米波段的行波管中具有较好的发展前景。 相似文献
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根据螺旋波纹波导的传输耦合方程,取输入模式为TE11,由螺旋波纹波导模式耦合规则得到输出模式为TE21,由此给出耦合方程的具体形式。用“迭代法”简化耦合方程,并进行数值分析,得到了波导波纹周期对传输特性的影响;利用简化后耦合方程解的解析式计算了螺旋波纹波导工作模式中各场幅值的比例关系。计算结果表明:在工作频段内螺旋波纹波导中场结构是一种混合模,以TE21模为主,其群速基本接近常数,可以和电子注在很宽的频带内产生互作用,为注波互作用的计算提供了依据。 相似文献
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用阶梯近似的方法分析任意槽形加载的圆波导慢波系统,利用各阶梯相邻面的导纳匹配条件 以及中心互作用区与加载区的场匹配条件,获得了任意槽形加载周期慢波结构的统一色散方 程. 利用该色散方程,得到色散特性与CST MWS仿真软件模拟结果良好符合. 分别求解几种 特殊槽形加载慢波结构的色散特性及耦合阻抗,其中,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.
关键词:
任意槽形
慢波结构
色散特性
行波管 相似文献
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从麦克斯韦方程和流体理论出发,推导了填充磁化等离子体慢波结构的基本方程.在大磁场情况下,对等离子体填充盘荷波导的色散特性和耦合阻抗作了研究,结果表明填充等离子体使色散曲线上移,耦合阻抗提高.等离子体填充产生出模式谱非常丰富的周期性低频等离子体模式(TG模式).当等离子体密度增加到一定程度后,场模TM01模的频率范围和TG01模的频率范围相近,两个模式互相耦合产生出新的混合模G1,G2.如果相对论行波管工作在混合模上,将会产生新的工作机理.
关键词:
盘荷波导
等离子体填充
色散特性
相对论行波管 相似文献
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将任意形状槽的连续轮廓近似用一系列相连的矩形阶梯近似,利用各阶梯面上导纳的匹配,以及槽与互作用区边界场的连续与匹配条件,获得了具有任意槽的矩形波导栅慢波结构的色散方程和耦合阻抗的表达式,并进行理论上的验证.加工制作了矩形槽波导栅模型,冷测表明理论值与测量值相吻合.分别求解几种特殊槽形矩形波导栅慢波结构的色散特性及耦合阻抗,其中,三角形结构的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.
关键词:
矩形波导栅
任意槽
色散特性
慢波结构 相似文献
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俄罗斯学者Denisov等提出一种螺旋波纹波导结构,通过两模式在角向上的耦合使电子与波在宽频带内发生有效的作用,由此制成的回旋行波管从物理机理上增大了互作用效率和频带宽度。因此以它为高频结构的回旋行波管已成为当今的研究热点,其关键技术是对螺旋波纹波导进行色散和互作用设计。 相似文献
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Liqun Xu Shijie Lin Lanfen Qi Ye Luo 《International Journal of Infrared and Millimeter Waves》1988,9(3):265-272
A practical design of nonradiative dielectric (NRD) waveguide directional couplers is presented. The dispersion characteristics of coupled NRD-guides and the scattering coefficients of NRD-guide directional couplers are studied as well as the transitions from metal rectangular wave-guide to NRD-guide couplers. Experiments of 3-dB and 10-dB NRD-guide couplers in ka-band show that the couplers are of good performance and promise in millimeter-wave integrated circuits. 相似文献
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Analysis of the Coaxial Ridge-Loaded Helical Groove Waveguide 总被引:1,自引:0,他引:1
Yonghai Lan Wenxiang Wang Yubin Gong 《International Journal of Infrared and Millimeter Waves》2002,23(3):425-434
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. 相似文献
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Yanyu Wei Wenxiang Wang Guoqing Zhao Jiahong Sun Peng Zhou 《International Journal of Infrared and Millimeter Waves》1999,20(8):1581-1592
A new kind of helical groove structure, step-loaded groove waveguide is presented and analyzed in this paper. The dispersion equation of this structure is derived by means of a field-matching method. This equation may be reduced to the dispersion equation of helical ridge-loaded structure and rectangular one. In order to demonstrate the influence of the step on the dispersion properties, the comparison of the dispersion characteristics is made in these helical rectangular and modified rectangular groove structures. Form the analysis, it is shown that the step loading tends to reduce the dispersion of the helical groove circuit and the step-loaded structure has the weaker dispersion compared with the rectangular one or the ridge-loaded one. The effect of the step shape on the wave properties is also discussed under the deep groove case. The theoretical results explicitly indicate that the V-like step-loaded structure has the weakest dispersion in all step-loaded structures. 相似文献
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The Analysis of Hole-Gap Helical Groove Waveguide 总被引:1,自引:0,他引:1
Wenxiang Wang Yonghai Lan Yanyu Wei 《International Journal of Infrared and Millimeter Waves》2000,21(10):1617-1625
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. 相似文献