共查询到19条相似文献,搜索用时 125 毫秒
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螺旋耦合型慢波结构,是近年发展起来的一种大功率正交场放大管慢波线。它具有较宽的带宽,较高的耦合阻抗,较大的平均功率容量,易于实现宽带传输匹配,因而获得了比较广泛的应用。本文采用多导体传输线及等效电路方法,对这类慢波结构进行了理论分析,导出了色散特性和耦合阻抗的解析表达式,计算了场的横向分布,运用大量的计算机结果,讨论了慢波结构各个尺寸对色散和耦合阻抗的影响。实验结果证明,本文所给出的结果可供工程设计使用。 相似文献
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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。 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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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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I. A. Nakrap A. N. Savin Yu. P. Sharaevskii 《Journal of Communications Technology and Electronics》2006,51(3):316-323
The results of investigation on the possibility of a substantial extension of the operating-frequency band of a slow-wave structure of coupled-cavities-chain type are presented for the case of a small variation in the slowing factor of the phase velocity of a wave, including, in the case of convergence of the cavity and slot passbands. The investigation is performed with the use of regression models for electrodynamic characteristics of the slowing structure that are constructed on the basis of the results obtained by the impedance design of experiments. Variants of wideband chains of coupled cavities with differences in the phase-velocity slowing factor of ±3% and the operating width of the cavity passband of up to 35%, as well as structures with merging of the cavity and slot passbands and a resulting passband of up to 70% and a coupling impedance of 18–0.4 Ω, are obtained. 相似文献
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XiaoFang Zhu ZhongHai Yang BaoQing Zeng 《Journal of Infrared, Millimeter and Terahertz Waves》2004,25(5):837-843
Recent development of MEMS technologies has provided a set of methods for mass production of three-dimensional micro-scale structures and have opened the door to new and exciting possibilities in vacuum electronics devices. These micro-fabricated vacuum electronic devices are popular for the advantages of small volume, low cost, good performance, etc. In this article, Cold characteristics of a miniature coupled cavity slow-wave structure are simulated and discussed by using 3-D electromagnetic software MAFIA. The results show that this miniature structure can work at near 1.3 THz with high interaction impedance about 20 ohm and can be expected to be a promising THz radiation source. 相似文献
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返波振荡器是一种重要的真空电子学太赫兹源,具有高功率、高工作频率和宽带调谐等特点.为提高圆形电子注与光栅慢波结构的互作用,提出一种双电子注嵌入矩形光栅的慢波结构,使电子注与光栅表面电场更好地充分相互作用,从而提高互作用效率和输出功率.通过数值求解和仿真计算其色散特性,结果表明,相比于相同结构参数的普通矩形单栅,该结构可... 相似文献
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Characterized with full-metal structure, high output power and broad bandwidth, microfabricated folded waveguide is considered
as a robust slow-wave structure for millimeter wave traveling-wave tubes. In this paper, cold-test (without considering the
real electron beam) properties were studied and optimized by 3D simulation on slow-wave structure, for designing a 220 GHz
folded waveguide traveling-wave tube. The parametric analysis on cold-test properties, i.e., phase velocity, beam-wave interaction
impedance and cold circuit attenuation, were conducted in half-period circuit with high frequency structure simulator, assisted
by analytical model and equivalent circuit model. Through detailed parametric analyses, interference between specified structural
parameters is found on determining beam-wave interaction impedance. A discretized matrix optimization for interaction impedance
was effectively carried out to overcome the interference. A range of structural parameters with optimized interaction impedance
distributions were obtained. Based on the optimized results, a broadband folded waveguide with cold pass-band of about 80 GHz,
flat phase velocity dispersion and fairly high interaction impedance was designed for a 220 GHz central frequency traveling-wave
tube. A three-dB bandwidth of 20.5 GHz and a maximum gain of 21.2 dB were predicted by small signal analysis for a 28 mm-long
lossy circuit. 相似文献
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S. V. Mukhin D. Yu. Nikonov V. A. Solntsev 《Journal of Communications Technology and Electronics》2008,53(10):1250-1258
The properties of the local coupling impedance that determines the efficiency of the electron-wave interaction in periodic slow-wave structures are investigated. This impedance is determined (i) through the characteristics of the electromagnetic field in a slow-wave structure and (ii) through the parameters of a two-port chain simulating the structure. The continuous behavior of the local coupling impedance in the passbands of slow-wave structures, at the boundaries of the passbands, and beyond the passbands is confirmed with the help of a waveguide-resonator model. 相似文献
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《Electron Devices, IEEE Transactions on》1976,23(5):491-493
The interaction impedance of coupled cavity slow wave structures can be measured by perturbing the resonances of a shorted length of the structure using a dielectric rod. An analysis of this procedure is presented. The analysis retains radial as well as axial electric fields and all significant space harmonics. The results obtained are easily programmed formulas for calculating total interaction impedance or Pierce impedance using the experimental data. 相似文献
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分析了一种适用于E波段81~86 GHz空间行波管的新型慢波结构——折叠矩形槽波导.折叠矩形槽波导来源于传统的矩形槽波导,将E面沿其纵向来回弯曲而形成.利用电磁场仿真软件Ansoft HFSS设计优化并最终确定了E波段折叠矩形槽波导的关键几何尺寸.同时,模拟仿真出了折叠矩形槽波导在中心频率f=83.5 GHz处的耦合阻抗沿x和y方向上的变化趋势,得出其可通过加载带状电子注获得更高的平均耦合阻抗.利用CST粒子工作室模拟得出:折叠矩形槽波导行波管在中心频点83.5 GHz处输出功率为210 W,电子效率达到8.05%. 相似文献
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Chengfang Fu Bo Zhao Yudong Yang Yongfeng Ju Dingli Yang Bo Chang Xiaofeng He 《Journal of Infrared, Millimeter and Terahertz Waves》2016,37(11):1106-1116
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. 相似文献