共查询到20条相似文献,搜索用时 109 毫秒
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孙宝成徐想郝保良李紫琳李伟杨小萌 《真空电子技术》2023,(1):42-45
主要针对Ka波段宽带高功率螺旋线行波管慢波结构进行了优化设计,旨在提高行波管输出功率和效率,并对返波振荡特性进行了仿真分析。行波管测试结果表明,在工作频段26.5~40 GHz,连续波输出功率大于200 W,总效率超过41%,增益大于31.5 dB。该管可作为Ka波段大功率毫米波功率放大器,应用于各类军事和民用电子系统中。 相似文献
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X波段行波管阳极控制电子枪设计 总被引:1,自引:0,他引:1
大功率电子枪设计中的主要问题是如何构成强流电子束和使电子枪中电子束聚焦。利用差值计算的方法初步确定了电子枪几何尺寸参数,进而应用数值模拟的方法计算了电子枪的结构及束流特性,设计了应用于X波段连续波大功率行波管的阳极控制电子枪。该电子枪设计参数为:阳极调制,导流系数为0.44μP,射程大于37mm,注腰半径为1mm。结果表明,该电子枪可完全满足x波段连续波大功率行波管对互作用电子束的要求。 相似文献
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为了使更高频率的行波管放大器与机载军用设备的和卫星的要求相适应,在改进普通螺旋线行波管技术水平的基础上研制了一种新的行波管。这个行波管在 Ka 波段,在从35到40千兆赫的频率范围内能给出连续波功率10瓦。它代表了螺旋线型周期永磁聚焦行波管当前的最高水平。慢波结构是用精密绕制的钨螺旋线,平均直径0.029英寸,它由四根氧化铍瓷棒夹持。由于选择了低导流系数,因而得到一个适中的5%电子注效率。利用一个有效的单级降压收集极,使效率提高到20%。本文描述行波管的电气的和机械的设计以及高可靠长寿命行波管的主要设计标准。关于螺旋线热性能的分析将和它的制作和组装问题一起另行说明。 相似文献
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Shunkang Liu 《Journal of Infrared, Millimeter and Terahertz Waves》1997,18(6):1317-1321
Backward wave oscillations are easy occurred in high power helix millimeter wave traveling wave tubes (MMW TWT’s), owing to larger ka value and higher operating voltage. The start current of backward wave is calculated for helix TWT in Ka band. It is shown that start current will increase by used a tapered helix. Backward wave oscillations can be suppressed in tube. The design method of the tapered helix is given in this paper. 相似文献
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Shunkang Liu 《Journal of Infrared, Millimeter and Terahertz Waves》1999,20(5):859-865
Backward wave oscillation can be troublesome in high power helix TWT, especially millimeter wave helix traveling wave tubes (MMW HTWT's). To suppress these oscillations, start-oscillation current of backward wave has to know when MMW HTWT's are designed. A fast computation of the start-oscillation current for MMW HTWT's is presented. It is shown that the computed values are agreed with the experimental results in Ka band. 相似文献
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应用于毫米波系统的行波管电压低、效率高,本文简要分析了低电压、高脉冲输出功率Ka波段行波管关键技术,介绍了设计方案和制管结果。行波管在17 kV工作电压脉冲输出功率600 W。 相似文献
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The market situation of space traveling wave tubes (TWTs) over the last four years is reviewed. It is exemplified that space TWTs are not only the key components for the traditional frequency ranges in C- and Ku-band, but also for new satellite communication systems as digital audio broadcasting in the lower L- and S-band frequency range and the planned, new global multimedia systems. There, Thomson Tubes Electroniques GmbH (TTEG) has developed the new family of Ka band TWTs, which provide the large bandwidth and power requirements for high data rate transmission. TTEG is also developing 60-GHz TWTs as RF intersatellite-links for global satellite systems. The promising results of the 560 g lightweight, 25 W, broadband helix TWT are mainly reported and the requirements compared with those for a parallel 60 W 60-GHz interdigital line TWT development 相似文献
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理论分析毫米波螺旋线行波管慢波系统导体和介质损耗 总被引:1,自引:1,他引:0
该文基于夹持杆分层螺旋带模型和3维电磁场模型分析,详细研究了毫米波螺旋线行波管慢波系统的导体和介质损耗。螺旋带模型中介质损耗考虑为纵向传播常数的虚部,给出电磁场的解析解,导体损耗由螺旋线和管壳表面的面电流不连续性获得。3维电磁场模型分析通过本征模法,求解单周期结构的品质因数和周期储能,获得有限导电率导体和夹持杆陶瓷损耗角带来的慢波系统高频损耗。结果表明,毫米波段螺旋线的导体损耗和夹持杆的介质损耗远大于管壳导体损耗,介质损耗与陶瓷损耗角呈线性关系,对高频损耗的影响不可忽略。 相似文献
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《Electron Devices, IEEE Transactions on》1962,9(2):217-221
Helix loss increases the noise figure of a TWT by altering the amplifying properties of the tube, and also by acting as a source of thermal noise which is amplified by interaction with the beam. Noise power originating in the helix propagates as a wave and undergoes amplification in the same manner as the signal. This noise power adds to the noise figure of the tube by an amount proportional to the attenuation of the helix and to its temperature, and inversely proportional to the tube gain per unit length. The effect of refrigerating the helix has been demonstrated by several experiments in which low-noise TWT's were immersed in liquid nitrogen while monitoring the noise figure. The reduction in noise figure varied from a few tenths to nearly one db. One case of particular interest is that of a WJ-226 low-noise TWT, operating in the frequency band 1.4 to 2.3 Gc, which showed a minimum noise figure of 2.6 db when operating in a room temperature environment. On cooling the tube to liquid nitrogen temperature, a minimum noise figure of 1.7 db was obtained, at a frequency of 1.65 Gc. 相似文献
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Yu. N. Pchelnikov A. A. Elizarov 《Journal of Communications Technology and Electronics》2009,54(9):1027-1034
The limitations on the output power and operating frequency of the broadband TWTs resulting from a relatively low thermal
stability of helix and the self-excitation at the backward wave at a operating voltage of greater than 10 kV are considered.
The analysis yields the methods to overcome limitations: the application of a bifilar helix with the azimuthally conducting
rings and the application of combined metal-dielectric supports that allow a simultaneous improvement of the heat removal
from the helix and an increase in the TWT band. It is demonstrated that a decrease in the slowing caused by the rings and
a smaller period of the bifilar helix make it possible to shift the threshold of the self-excitation at the backward wave
to 30–40 kV. 相似文献