共查询到20条相似文献,搜索用时 15 毫秒
1.
Linear Analysis of Folded Double-Ridged Waveguide Slow-Wave Structure for Millimeter Wave Traveling Wave Tube 下载免费PDF全文
A novel slow-wave structure (SWS), the folded double-ridged waveguide structure, is presented and its linear gain properties are investigated. The perturbed dispersion equation is derived and the small signal growth rate is caleulated for dimensions of the ridge-loaded region and the parameters of the electron beam. The novel structure has potential applications in the production of high power and broad band radiation. For a cold beam, the linear theory predicts a gain of 1.1-1.27dB/period and a 3-dB small-signal gain bandwidth of 30% in W-band. A comparison between the folded double-ridged waveguide SWS and folded waveguide SWS (FWSWS) shows that with the same physical parameters, the novel SWS has an advantage over the FWSWS on the bandwidth and electron efficiency. 相似文献
2.
Shunkang Liu 《International Journal of Infrared and Millimeter Waves》2000,21(4):655-660
Folded waveguide circuit (FWC) is an ideal slow wave structure for broadband power traveling wave tube (TWT) in millimeter wave. But owing to changes of propagating character by reflecting of waveguide bend and electron beam hole, stopband can be formed. On the basis of computation of the stopband, effects of the dimension of FWC on stopband width are analyzed. It is available for design in FWC TWT. 相似文献
3.
Bin Li Xiaofang Zhu Li Liao Zhonghai Yang Baoqing Zeng Lieming Yao 《International Journal of Infrared and Millimeter Waves》2006,27(7):941-947
Two kinds of novel helical slow wave circuit, supported by Chemical Vapor Deposition (CVD) diamond, are presented. They are
applying in miniaturized millimeter wave helical traveling wave tube. Cold test characteristic of these circuits are simulated
by MAFIA code. Higher performances are achieved with smaller size, compared with conventional circuit supported by BeO rods.
The nonlinear analysis is implemented by Beam and Wave Interaction (BWI) module, which is a part of TWTCAD Integrated Framework.
Results have been found to be consistent with the expectation. It should be wider apply in microwave and millimeter wave vacuum
electronic devices. 相似文献
4.
Shunkang Liu 《International Journal of Infrared and Millimeter Waves》2000,21(2):181-185
On the basis of computation of dispersion and coupling impedance for folded waveguide circuit (FWC), main performances: interact coefficient, saturated gain and output power are analyzed. Computation shows that if FWC is used in MMW amplifier, high power and wide band can be easy reached. 相似文献
5.
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
6.
由于Ka波段耦合腔行波管放大器设计技术取得了较大的发展,已经可以满足军用雷达的严格要求,这种设计技术也受到更多的关注.这里简要介绍Ka波段耦合腔行波管放大器的设计技术.通过介绍Ka波段耦合腔行波管放大器的基本组成、工作原理及设计中仿真工具的运用来说明这种设计技术.用这种设计技术成功设计出了多种耦合腔行波管放大器,在功率和体积方面突破了原有的Ka波段固态和螺旋线行波管放大器的局限,取得了明显的进步.Ka波段耦合腔行波管放大器的设计技术经过实践验证,在输出功率、带宽及重量方面已经取得了重大突破,满足了现代军用雷达的需求. 相似文献
7.
A novel slow-wave structure (SWS), the folded double-ridged waveguide structure, is presented and its linear gain properties are investigated. The perturbed dispersion equation is derived and the small signal growth rate is calculated for dimensions of the ridge-loaded region and the parameters of the electron beam. The novel structure has potential applications in the production of high power and broad band radiation. For a cold beam, the linear theory predicts a gain of 1.1-1.27dB/period and a 3-dB small-signal gain bandwidth of 30% in W-band. A comparison between the folded double-ridged waveguide SWS and folded waveguide SWS (FWSWS) shows that with the same physical parameters, the novel SWS has an advantage over the FWSWS on the bandwidth and electron efficiency. 相似文献
8.
9.
Shunkang Liu 《International Journal of Infrared and Millimeter Waves》2000,21(9):1489-1493
A significant advantage of the folded wave traveling wave tube (TWT) is simple coupling structure. In millimeter wave band, owing to higher frequency, linear double taper can be used as impedance transformer. The design method and calculation results for the folded waveguide TWTs in K-band are given. 相似文献
10.
Hyun-Jun Ha Sun-Shin Jung Zan-Zhi Huang Dong-Ho Jang Gun-Sik Park Jin-Gyu Song Gong-Man Park Hyee-Jea Kang 《International Journal of Infrared and Millimeter Waves》1999,20(12):2099-2106
Ku-band (14-14.5 GHz) folded waveguide TWT operated at the beam voltage and current of 6 kV and 0.1 A, respectively, has been studied experimentally. The RF circuit is designed by using a linear theory [1] and its predicted gain for a single stage is 20 dB. The cold test of the assembled RF circuit shows a good agreement with the theoretical prediction [2]. 相似文献
11.
《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
12.
A novel Ka-band folded waveguide (FW) amplifier for traveling wave tubes (TWT) is investigated. The dispersion curve and interaction impedance are obtained and compared to the normal FW circuit by numerical simulation. The interaction impedance is higher than a normal circuit through the whole band. We also study the beamwave interaction in this novel circuit, and the nonlinear large-signal performance is analyzed by a 3-D particlein-cell code MAGIC3D. A much higher continuous-wave (CW) output power with a considerably shorter circuit compared to a normal circuit is predicted by our simulation. Moreover, the novel FW even has a broader 3-dB bandwidth. It therefore will be useful in designing a miniature but high-power and broadband millimeter-wave TWT. 相似文献
13.
I. O. Zolotovskii D. A. Korobko P. P. Mironov D. I. Sementsov A. A. Fotiadi M. S. Yavtushenko 《Optics and Spectroscopy》2018,124(3):418-423
It is demonstrated that strong ultrafast modulation of a tunneling wave packet of the whispering-gallery-mode type can be implemented in a cylindrical optical waveguide exhibiting spatiotemporal inhomogeneity induced by a travelling refractive-index wave. The corresponding optical waveguides can be used for efficient generation of picosecond and subpicosecond laser pulses. 相似文献
14.
Amin Esfahani 《理论物理通讯》2011,55(3):381-386
This paper studies the Generalized Bretherton equation using trigonometric function method including the sech-function method, the sine-cosine function method, and the tanh-function method, and He's semi-inverse method (He's variational method). Various traveling wave solutions are obtained, revealing anintrinsic relationship among the amplitude, frequency, and wave speed. 相似文献
15.
16.
Shunkang Liu 《International Journal of Infrared and Millimeter Waves》2004,25(3):471-480
Large signal operating equations in TWT have been solved by numerical solve method. The relations between interaction efficiency and design parameters in TWT are analyzed. A fast engineering design method of enhancing efficiency for folded waveguide TWT by velocity resynchronization is described. The computation is shown that the efficiency of Ka-band folded waveguide TWT with double taper can be enhanced over twice as original tube. This method of approach is very useful for tube designer. 相似文献
17.
根据行波管用的关键材料-钨铼合金中高含量铼测定的需求,研究了用X射线荧光(XRF)光谱法测定铼时所存在的基体效应、谱线重叠和背景干扰的影响,从理论上解释了XRF二元比例法校正曲线线性差的原因。理论和实验结果均表明:直接用Re Lα分析线强度绘制的校正曲线比二元比例法可以获得更好的线性。本法具有快速准确的特点,分析结果与化学方法一致,在生产控制中应用效果显著。 相似文献
18.
梁金福 《原子与分子物理学报》2010,27(5):921-926
本文利用一种该进的映射法和线性变量分离法,得到(2+1)-维色散长波方程大量的,带有两个任意函数的精确解。并在得到的一个周期波精确解的基础上,通过选择恰当的函数,可以观察到(2+1)-维色散长波方程的折叠孤立波的演化行为。 相似文献
19.
Shunkang Liu 《International Journal of Infrared and Millimeter Waves》2002,23(6):899-906
The efficiency enhancement methods for helix and coupled cavity traveling wave tube (TWT) in millimeter wave (MMW) are described. The interaction efficiency has been reached 14.56% by dynamic velocity taper in Ka-band TWT. Efficiency improvement has been carried out by used copper helix for broadband MMW TWT. Owing to a ferruleless coupled cavity TWT used phase-adjusted taper, the interaction efficiency has been increased from 9.6 to 22.6%. Finally, enhancing collector efficiency used multistage depressed collectors is discussed in the paper. These concept and technology of the approach are very useful for tube designer. 相似文献
20.
Ming-Chieh Lin 《International Journal of Infrared and Millimeter Waves》2007,28(5):355-362
A multilayer waveguide window is demonstrated to exhibit wide bandwidth and high transmission for applications in high-frequency
microwave tubes. A transfer matrix approach is employed to discretize the dielectric function profile of the multilayer heterostructure
in a rectangular waveguide. The closed form has been obtained and the corresponding reflection and transmission characteristics
have been carried out. The analytical calculation is also compared with the result of numerical simulation via the finite-element
code HFSS. The exact calculation agrees with the numerical simulation very well. By comparison, the approach not only enhances
the accuracy and efficiency, but also gives a good criterion for the design. The results show that the bandwidth for a transmission
of 99%, i.e., S
11 below –20 dB, can be optimized to be about 8.75 GHz at a central frequency of 35 GHz or about 25%. A wide-bandwidth waveguide
window can be easily designed for Ka-band and W-band tubes, and even for higher frequency ones. 相似文献