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1.
《中国物理快报》2016,(4)
The 60-GHz traveling-wave tube(TWT) prevails nowadays as the amplifier for the satellite communication and electronic countermeasures.The folded waveguide(FW) is a promising all-metal slow-wave structure(SWS)for the 60-GHz TWT with advantages of robust performance,fine heat dissipation,considerable power and bandwidth.A novel FW periodically loaded with rectangular grooves is analyzed for the purpose of gaining higher power and gain.The rf characteristics are investigated by numerical simulation,and the nonlinear largesignal performance of such a TWT is analyzed by a 3D particle-in-cell code MAGIC.Compared with normal circuits,relatively higher continuous-wave power(40-56 W) and similar bandwidth(5 GHz) are predicted by simulation.Meanwhile,the designed operation voltage is 10.5kV,which keeps the low-voltage advantage of the popular helix TWT competitor.The novel FW will favor the design of a broadband and high-power 60-GHz TWT. 相似文献
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高频系统是行波管的核心部件,它会直接影响行波管的工作频率、带宽、增益等性能指标。为了获得更大的输出功率和更高的增益,对0.34 THz双注高次模折叠波导行波管的基本特性进行了研究,计算了双注折叠波导的色散特性和耦合阻抗,并与仿真结果进行对比,结果显示色散特性随频率升高差距增大,耦合阻抗在高频段匹配较好,并研究了损耗特性。利用CST仿真工作室对双注折叠波导的注波互作用特性进行了仿真,实现41.68 W输出。为了获得更高的输出,通过增大直波导高度,最终使输出功率提高了52.7%,达到63.12 W。最后设计了符合要求的盒型输出窗和模式转换器,验证了高频系统的传输特性。 相似文献
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《中国物理快报》2016,(9)
Millimeter-wave traveling-wave tube(TWT) prevails nowadays as the amplifier for radar,communication and electronic countermeasures.The rectangular waveguide grating is a promising all-metal interaction circuit for the millimeter-wave TWT with advantages of high power capacity,fine heat dissipation,scalability to smaller dimensions for shorter wavelengths,compact structure and robust performance.Compared with the traditional closed structure,the open rectangular waveguide grating(ORWG) has wider bandwidth,lower cut-off frequency,and higher machining precision for higher working frequencies due to the open transverse.It is a potential structure that can work in the millimeter wave and even Terahertz band.The rf characteristics including dispersion and interaction impedance are investigated by both theoretic calculation and software simulation.The influences of the structure parameters are also discussed and compared,and the theoretical results agree well with the simulation results.Based on the study,the ORWG will favor the design of a broadband and high-power millimeter-wave TWT. 相似文献
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为解决THz行波管工作电流过小、输出功率低等问题,提出了基模多注工作模式的折叠波导行波管.首先,获得了基模多注折叠波导色散特性的等效传输线计算模型,并与数值模拟结果进行了比较;然后,对基模多注折叠波导的传输特性进行了模拟计算;最后,通过模拟和理论计算完成了0.14 THz基模多注折叠波导行波管的注波互作用特性分析.电子注参数为12 m A,15.75 k V时,获得的3 d B带宽为25 GHz(128—153 GHz),最大增益为33.61 d B,最大峰值功率为23 W;电子注参数为30 m A,15.75 k V时,在0.14 THz处获得了38 d B增益,最大脉冲输出功率为63.1 W.对比同条件下基模单注折叠波导行波管,3 d B带宽提升了1倍,0.14 THz处输出功率增大了9.66倍,互作用效率增大了3.22倍;当增益相同时,多注方式的互作用长度较单注缩短了33%.该方法能够有效增大THz行波管的工作电流,提高互作用增益及效率、3 d B带宽、输出功率;在增益相同时,基模多注行波管可以做得更短更紧凑. 相似文献
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利用曲折波导慢波结构和一个长宽比为3∶1的带状电子注作为注-波互作用电路,完成了对V波段大功率行波管互作用电路的设计。分析了带状电子注通道对高频特性的影响,并在综合考虑色散和耦合阻抗的情况下得到了优化的结构参数。建立了3维的V波段带状注曲折波导行波管的电路模型,并利用CST粒子工作室完成了注-波互作用的仿真研究。研究结果表明,当工作电压和电流分别为17 kV和150 mA时,带状注曲折波导行波管在58~62 GHz时的饱和平均输出功率大于160 W,增益大于34.7 dB。 相似文献
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通过模拟计算,分析螺旋线内径和螺距变化对色散和耦合阻抗的影响,优化慢波结构,初步设计了Ku波段螺旋线行波管慢波结构。模拟行波管输入输出结构,得到输入端反射系数小于-19 dB,电压驻波比小于1.24。电子聚焦系统采用周期永磁聚焦,磁场周期为8.5 mm,计算得到磁场峰值为0.17 T。为提高注波互作用效率,采用具有动态速度渐变特性的慢波结构,使得电子注与高频场有足够的互作用时间,从而保证电子不断地将能量交给高频场。运用三维PIC粒子模拟软件分析行波管的注波互作用,得到在12.5~16 GHz频率范围内输出功率大于88.7 W,电子效率大于14.8%,增益大于34.6 dB。 相似文献
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为了提高太赫兹行波管的输出功率,提出了多个传输信号进行功率合成的方法。首先,对D波段多注慢波结构进行设计及功分器的优化;然后,通过微铣削工艺完成了两注THz折叠波导结构的加工,加工精度满足实际设计要求;最后,利用CST软件对该结构的冷测与互作用特性进行了分析。仿真结果表明:该结构的S11值小于-20 dB,实际测试值在-20 dB左右,两者较吻合。冷测分析表明该结构具有22 GHz(16%)的冷带宽,3 dB增益带宽为12.5 GHz。在各电子注的电压、电流、峰值输入功率大小分别为15.79 kV, 12 mA, 10 mW时,单注结构获得了1.58 W的输出功率及22 dB的增益;而两路信号在互作用完成后,获得了2.91 W的合成功率输出,合成效率不低于90%。通过合成的方法可以有效提高THz行波管的输出功率。. 相似文献
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基于降低工艺难度的目的,提出了一种新型反绕双螺旋线慢波系统,该系统的正绕反绕螺旋线半径不等。利用3维电磁软件CST MWS仿真分析了结构参数对色散和耦合阻抗的影响。结果表明:耦合阻抗在螺旋带内半径较大时没有明显下降;减小螺旋带宽度有利于降低相速度和提高耦合阻抗;在一定范围内,相速度随螺距的减小而增大。在此基础上,结合工程要求设计了8 mm波段行波管的新型反绕双螺旋线慢波系统,耦合阻抗达到21 Ω,工作电压约为20 kV,同时由于电子通道半径较大,降低了对电子光学系统的要求;纵向翼片加载的引进较为有效地展宽了带宽。 相似文献
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Shunkang Liu 《International Journal of Infrared and Millimeter Waves》2000,21(6):915-920
The characteristics of two kinds of bifilar helix circuit are discussed in this paper. One is alike wound bifilar helix and another is contrawound bifilar helix. Alike wound bifilar helix is often used in O-type backward wave tube (BWO). Owing to wider operating bandwidth, higher interaction impedance and large dimensions, the contrawound helix is suitable for broadband millimeter wave traveling wave tube (MMW TWT). 相似文献
12.
An open-styled dielectric-lined azimuthally periodic circular waveguide for a millimeter wave traveling-wave tube 下载免费PDF全文
An open-styled dielectric-lined azimuthally periodic circular waveguide (ODLAP-CW) for a millimeter-wave traveling-wave tube (TWT) is proposed, which is a modified form of a dielectric-lined azimuthally periodic circular waveguide (DLAP-CW). The slow-wave characteristics of the open-styled DLAP-CW are studied by using the spatial harmonics method, which includes normalized phase velocity and interaction impedance. The complicated dispersion equations are numerically solved with MATLAB and the results are in good agreement with the simulation results obtained from HFSS. The influence of structural parameters on the RF properties is investigated based on our theory. The numerical results show that the optimal thickness of the metal rod can increase the interaction impedance, with the dielectric constant held fixed. Finally, the slow-wave characteristics and transmission properties of an open-styled structure are compared with those of the DLAP-CW. The results validate that the mode competition is eliminated in the improved structure with only a slight influence on the dispersion characteristics, which may significantly improve the stability of an open-styled DLAP-CW-based TWT, and the interaction efficiency is also improved. 相似文献
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Shunkang Liu 《International Journal of Infrared and Millimeter Waves》2000,21(7):1097-1101
The feature of the ring-loop slow wave structure is high coupling impedance and low harmonic wave components. Therefore ring-loop traveling wave tube (TWT) has advantages of high gain, small dimension, higher operating voltage and less danger of the backward wave oscillation. But calculation of the ring-loop is rather difficult. Here on basis of calculation of dispersion and impedance, a fast estimation of interaction efficiency, output power and saturated gain for Ka-band ring-loop TWT are given. 相似文献
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提出了一种曲折双脊波导慢波结构,理论分析了慢波结构的高频特性,并在此基础上设计了工作在Ka波段的曲折双脊波导行波管.利用三维粒子模拟软件MAGIC 3D建立了曲折双脊波导行波管模型,并对行波管中的注-波互作用进行了模拟分析.在相同工作条件下,分析比较了曲折双脊波导行波管和曲折波导行波管的各种性能参量,从中发现:在行波管增益峰值相近的情况下,曲折双脊波导行波管具有更好的带宽性能,其3 dB增益带宽为22%;同时具有更高的电子效率,其峰值接近9%.
关键词:
曲折双脊波导
高频特性
注-波互作用
带宽 相似文献
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Software Cold Test Simulation of Coupled Cavity Slow-Wave Structure in Millimeter Wave TWT 总被引:2,自引:0,他引:2
In this paper, the software cold-test simulation method to obtain RF dispersion, interaction impedance by MAFIA software is discussed considering effect of the conducting barrel in the millimeter-wave TWT. The dispersion simulation result is obtained more consistent with experiment data than the method that ignoring effect of the conducting barrel. By changing the structure parameter, high frequency characteristic will be affected. The change relationship of high frequency characteristic with structure parameter is obtained. The different calculation methods of the interaction impedance are discussed. These results are received and are consistent with experiment data. 相似文献
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优化设计了一种220 GHz的折叠波导慢波结构的尺寸,对其冷测特性如色散、耦合阻抗和衰减进行了分析。理论分析和软件仿真结果表明设计的折叠波导慢波结构在中心频率处具有较平缓的色散关系,较高的耦合阻抗和较低的电路衰减。互作用模拟表明,在电子注电压为20 kV,电流为10 mA时,27 mm(50个周期)的折叠波导慢波结构在220 GHz具有14.5 dB的增益,3 dB带宽为16.3 GHz(211.9~228.2 GHz)。 相似文献
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Chong-Qing Jiao Ji-Run Luo 《International Journal of Infrared and Millimeter Waves》2007,28(12):1095-1101
This study proposes a Ka-band harmonic-doubling gyrotron traveling-wave amplifier (gyro- TWT), using distributed wall losses
in the input stage and mode-selective interaction circuit in the output stage, to improve the stability of the amplification.
Based on a large signal simulation code, a saturated peak power of 163 kW with an efficiency of 15.5%, a gain of 31.1 dB,
and a 3 dB bandwidth of 0.9 GHz is predicted for the gyro-TWT driven by 70 kV, 15 A electron beam with a velocity ratio of
1.2 and velocity spread 5% at 33.2 GHz. 相似文献