共查询到18条相似文献,搜索用时 140 毫秒
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针对行波管慢波结构热分析的必要性,介绍了螺旋线慢波结构的热产生机理,结合ANSYS软件设计了可对不同翼片加载和不同形状夹持杆的螺旋线慢波结构进行热特性分析的专用仿真环境。利用该仿真环境,用户可以在不掌握ANSYS软件的情况下对螺旋线行波管慢波结构的热特性进行模拟计算。 相似文献
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V形杆夹持、翼片加载的螺旋线慢波结构很适合于宽频带行波管应用。本文对不同的翼片加载结构的色散特性进行了计算,计算数据与实验测量结果一致性较好。最后讨论了V形杆与圆形杆夹持时的介质负载和色散特性。 相似文献
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该文对螺旋线行波管中的场进行了数值分析。研究表明数值求解时主从边界条件的位置决定场传播的方向,螺旋线旋转方向决定场的旋转变化方向。螺旋线外各类夹持杆和翼片对螺旋线内部场分布影响很小,场基本随贝塞尔函数分布,但耦合阻抗变化较大,这主要是由于场受螺旋线外结构影响而影响功率分配。同时,对场的各次空间谐波的研究,特别是零次和负一次空间谐波,有利于准确地求解各次空间谐波的耦合阻抗,对提高螺旋线行波管放大器和返波振荡的大信号注波互作用计算的准确性有重要的意义。 相似文献
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V形杆夹持、翼片加载的螺旋线但波结构很适合于宽频带行波管应用。本文对不同的翼片加载结构的色散特性进行了计算,计算数据与实验测量结果一致性较好。最后讨论了V形杆与圆形杆夹待时的介质负载和色散特性。 相似文献
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金属翼片加载螺旋线电路是多倍频程行波管中广泛应用的慢波结构。本文对这种宽频带慢波结构的重要参量──耦合用抗进行了计算,在很宽的频率范围内,理论计算结果与发表的实验值相当吻合。 相似文献
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Jianhong Yang Yong Zhang Xueyuan Cai Lin Li 《Journal of Infrared, Millimeter and Terahertz Waves》2009,30(6):611-621
The effects of different metallic vane-loaded helix slow-wave structures of a traveling-wave tube are proposed based on the
analysis of the Fourier expansions of the exterior region with metallic vanes. The influences of the metallic vanes dimensions
on the phase velocity and interaction impedance are considered in detail. The computed data is compared with the reference
data in the 0−16 GHz frequency range with a good consistency. The analytical results reveal that the method of using Fourier
expansions can contribute effectively to the reducing of the error between the theoretical and experimented data (around 1.2%).
By analyzing the computed results, the performances of the helix slow-wave structure, with T-shaped metallic vanes are superior
to the sector-shaped with the same designed parameters. Adjustments can be made to the outer radius of T-shaped metallic vanes
which then control the dispersion relation showing either negative or positive, and it is similar to sector-shaped vanes by
adjusting its inner radius. And with increasing the distance between the helix and metallic vanes, the dispersion characteristics
and interaction impedance of the helix slow-wave structure with T-shaped/sector-shaped metallic vane are all improved. 相似文献
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Wenqiang Lei Zhonghai Yang Li Liao Ping Liao 《International Journal of Electronics》2013,100(3):161-172
The dispersion equation and interaction impedance of a U-shaped vane-loaded helical slow-wave structure (SWS) is obtained by considering the azimuthal space harmonic in the non-vane region and the helical tape thickness, using the field theory matching method in the azimuthal field discontinuity. The theoretical calculation by electromagnetic analysis is consistent with the simulation result by MAFIA, which can explain some physical essence of the SWS. In the helical SWS, negative dispersion is reported to reduce the second harmonic content of a wideband travelling-wave tube at the low-frequency end of the band. When the SWS is assembled, the support rods are easily located in the groove of the vane. The solution provides a new instruction method for other types of vane-loaded helical SWS. 相似文献
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针对角向夹持的角度对数周期曲折线慢波结构,提出了展宽其工作带宽、降低其工作电压的新方法.通过翼片加载技术,可以对慢波结构的色散特性进行修正,从而使得其带宽得到有效展宽.通过数值模拟仿真,得到无翼片加载的慢波结构以及多翼片加载的慢波结构的3 dB带宽分别为2. 5 GHz、3 GHz,工作电压分别为5 450 V、4 650 V.研究表明,翼片加载结构可以有效降低角度对数周期曲折线慢波结构的工作电压,以及展宽其工作带宽. 相似文献
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G. Singh S. M. S. Ravi Chandra P. V. Bhaskar P. K. Jain B. N. Basu 《International Journal of Electronics》2013,100(12):1463-1479
A cylindrical waveguide, provided with wedge-shaped metal vanes projecting radially inward from the wall of the guide, excited in the transverse electric (TE) mode, was analysed. The analysis was carried out considering the angular harmonics generated by the angular positioning of the vanes. A set of equations was generated in the Fourier amplitudes of field constants. The condition for nontrivial solutions for the field constants gave the dispersion relation of the structure. From the expression of power flow down the structure, its interaction impedance was also estimated. The shape of the dispersion characteristics and the value of the cutoff frequency as well as the interaction impedance characteristics of the waveguide were found to depend on the vane parameters their number as well as their radial and angular dimensions. The optimum vane parameters were obtained corresponding to the minimum variation of the slope of the ω-β dispersion plot, such parameters being useful from the standpoint of the bandwidth of a gyro-travelling-wave tube (gyro-TWT) using a vane-loaded cylindrical waveguide as the interaction structure. The dispersion and impedance characteristics, which were found typically for the TE01 mode as defined for the structure, taking four vanes, were more sensitive to the number and angular width of the vanes than to their radial depth. The value of the interaction impedance, calculated at the potential beam position, was found to be higher for a loaded waveguide than for an unloaded one, and it depended on the frequency of operation relative to the cutoff. The interaction impedance also depended on the position of the beam relative to the waveguide wall where it was estimated, and hence the optimum beam position corresponding to the maximum interaction impedance was found. The theory was validated against the dispersion characteristics reported elsewhere typically for four-vane magnetron-like structures excited in the 2π mode. Although the present study was restricted to ‘cold’ analysis of the structure in the absence of the electron beam, it could provide important feedback for analysing a gyro-TWT, using a vane-loaded cylindrical waveguide, and hence for predicting the structure parameters for the wide-band performance of the device. 相似文献
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《Microwave Theory and Techniques》1984,32(4):461-463
The results of an equivalent circuit analysis are studied for a potentially dispersion-free slow-wave circuit of a TWT which consists of a dielectric-supported helix in a metal shell provided with vanes. The optimum vane dimensions are predicted, which should be helpful in broadbanding the performance of a TWT. 相似文献
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磁绝缘线振荡器的冷腔研究 总被引:1,自引:0,他引:1
高频结构的设计是磁绝缘线振荡器(Magnetically Insulated Line Oscillator,MILO)实验成败的关键。本文利用电磁场程序研究了L波段硬管MILO的冷腔设计,对其本征模、品质因数、传输增益等冷腔的重要参数进行了计算和讨论,验证了L波段硬管MILO高频电磁结构的合理设计,并通过品质因数的计算对选用不同材料对器件的影响进行了讨论。 相似文献
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G. Singh M. V. Kartikeyan G. S. Park 《Journal of Infrared, Millimeter and Terahertz Waves》2006,27(3):333-342
Theoretical investigation of the peak-gain and 3-dB bandwidth of the vane-loaded gyro-traveling wave tube (gyro-TWT) amplifier in the small-orbit TE01 waveguide mode configuration at 35 GHz has been presented. The vane-loaded gyro-TWT enjoys higher gain and bandwidth compared to that of the smooth-wall device. In the analysis, the azimuthal harmonic effects generated due to the angular periodicity of vanes in the wedge-shaped metal vane-loaded cylindrical waveguide interaction structure have been taken into account in the cold (beam-absent) dispersion relation only. 相似文献