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1.
螺旋线行波管慢波系统的综合热分析法   总被引:2,自引:1,他引:1       下载免费PDF全文
该文提出了一种研究螺旋线行波管慢波系统散热性能的综合分析方法。该方法以一定的预备实验为前提条件,利用理论公式推算出接触处的界面热阻率,使用仿真软件进行精确的模拟研究。该方法可以准确的反映慢波系统的散热性能,可以降低实验成本,节约材料,节省实验时间。通过对采用氧化铍夹持杆、氮化硼夹持杆和镀铜螺旋线的慢波组件的研究,验证了该方法的一致性和可行性。  相似文献
2.
Electromagnetic field analysis of a helix slow-wave structure was carried out and a closed form expression was derived for the inductance per unit length of the transmission-line equivalent circuit of the structure, taking into account the actual helix tape dimensions and surface current on the helix over the actual metallic area of the tape. The expression of the inductance per unit length, thus obtained, was used for estimating the increment in the inductance per unit length caused due to penetration of the magnetic flux into the conducting surfaces following Wheeler’s incremental inductance rule, which was subsequently interpreted for the attenuation constant of the propagating structure. The analysis was computationally simple and accurate, and accrues the accuracy of 3D electromagnetic analysis by allowing the use of dispersion characteristics obtainable from any standard electromagnetic modeling. The approach was benchmarked against measurement for two practical structures, and excellent agreement was observed. The analysis was subsequently applied to demonstrate the effects of conductivity on the attenuation constant of a typical broadband millimeter-wave helical slow-wave structure with respect to helix materials and copper plating on the helix, surface finish of the helix, dielectric loading effect and effect of high temperature operation – a comparative study of various such aspects are covered.  相似文献
3.
该文将有限厚度的实际螺旋带等效为存在无限薄螺旋带的等厚真空层,从场分析和软件模拟两个方面研究了等效慢波结构的色散特性和耦合阻抗.将理论计算、软件模拟和实验测试结果进行了比较,结果表明,用真空层等效有限厚度的实际螺旋带时,将无限薄螺旋带置于等厚真空层的中央,其螺旋慢波结构的色散特性和耦合阻抗的理论计算、软件模拟和实验测试结果三者取得了很好的一致.  相似文献
4.
冯晨峰 《电子设计工程》2012,20(24):190-192
慢波结构是微波管重要的部件,它是电子注与高频场相互作用进行能量交换以实现微波振荡或放大的场所。随着对微波管性能越来越高的要求,微波管慢波结构的效率和性能要求也随之提高。文中首先分析了如何求解微波管慢波结构的高频特性,并在此基础上使用了HFSS以及CST MWS等软件对两种新型微波管慢波结构(环杆慢波结构、折叠波导慢波结构)的高频特性(色散特性、耦合阻抗)进行了初步的仿真研究,并通过对结果的分析比较了两个结构的特性。  相似文献
5.
张开春 《电子学报》2011,39(3):632-635
 本文选用矩形耦合腔作为太赫兹扩展互作用振荡器(EIO)的慢波结构,鉴于其结构的复杂性,采用等效电路方法计算其色散.详细研究了腔体和耦合槽的电路参数,计算了不同结构尺寸、圆形和矩形电子通道的0.12THz和0.225THz慢波结构的色散特性.并采用专业电磁软件,研究了不同结构参数下的色散特性、耦合阻抗和特征阻抗.通过对色散特性的比较,理论结果与电磁软件模拟结果相吻合.  相似文献
6.
This paper describes the design of tip loss profile on support rod for a high gain, high efficiency helix TWT. The tip loss profile at sever ends for the input and the output section of the helix slow wave structure has been designed for return loss at severs ends better than -20 dB. The experimental results have been carried out in the input and the output section of the helix assemblies for the high gain helix TWT to find the return loss in the region of carbon coated tip loss on the support rods. The experimental result has been compared with the simulated performance for the return loss at the sever ends. The design of tip loss profile on the support rod for helix TWT has been carried out in real situation using Ansoft HFSS. A good agreement has been found in the simulated and experimental results.  相似文献
7.
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
8.
An analysis of rectangular folded-waveguide slow-wave structure was developed using conformal mapping technique through Schwarz’s polygon transformation and closed form expressions for the lumped capacitance and inductance per period of the slow-wave structure were derived in terms of the physical dimensions of the structure, incorporating the effects of the beam hole in the lumped parameters. The lumped parameters were subsequently interpreted for obtaining the dispersion and interaction impedance characteristics of the structure. The analysis was benchmarked for two typical millimeter-wave structures, one operating in Ka-band and the other operating in Q-band, against measurement and 3D electromagnetic modeling using MAFIA.  相似文献
9.
A simple equivalent circuit model for the analysis of dispersion and interaction impedance characteristics of serpentine folded-waveguide slow-wave structure was developed by considering the straight and curved portions of structure supporting the dominant TE 10-mode of the rectangular waveguide. Expressions for the lumped capacitance and inductance per period of the slow-wave structure were derived in terms of the physical dimensions of the structure, incorporating the effects of the beam-hole in the lumped parameters. The lumped parameters were subsequently interpreted for obtaining the dispersion and interaction impedance characteristics of the structure. The analysis was simple yet accurate in predicting the dispersion and interaction impedance behaviour at millimeter-wave frequencies. The analysis was benchmarked against measurement as well as with 3D electromagnetic modeling using MAFIA for two typical slow-wave structures (one at the Ka-band and the other at the W-band) and close agreement observed.  相似文献
10.
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
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