共查询到20条相似文献,搜索用时 31 毫秒
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Shunkang Liu 《Journal of Infrared, Millimeter and Terahertz 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 Kα-band are given. 相似文献
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Wenxiang Wang Yanyu Wei Guofen Yu Yubin Gong Minzhi Huang Guoqing Zhao 《Journal of Infrared, Millimeter and Terahertz Waves》2003,24(9):1469-1484
All-metal slow-wave structures are being paid great attention because of their advantages, such as good heat dissipation, high power capacity, wide passband, good wholeness of structure and large size etc. The emphases in this paper concentrate on the present state of study of four types of structures: helical groove, ring-plane, folded waveguide and periodically loaded waveguide, including theoretical analyses and practical applications. The problems and directions for future studies of these types of slow-wave circuits are also discussed. It is pointed out that all-metal slow-wave structures are suitable for applications in millimeter wave vacuum devices, like TWT, BWO, Gyro-TWT, and relativistic devices. 相似文献
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矩形曲折波导具有机械强度高,容易加工,热性能好以及工作频带宽等优点。文中对曲折波导的色散特性和互作用阻抗进行了计算。并指出,将曲折波导应用于毫米波行波管作为其慢波电路,可解决大功率、宽频率和难加工的问题。 相似文献
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Shunkang Liu 《Journal of Infrared, Millimeter and Terahertz Waves》2003,24(3):335-347
In millimeter wave range, high-power traveling wave tube (TWT) is a key device with broadband and high-power amplification. Basis of comparing traditional and new type slow wave circuits for high-power TWT in MMW, analysis and computation of propagating and RF performance for folded wave circuit are carried out. Theoretic calculation and experimental test show that folded wave circuit is an ideal slow wave structure for broadband and high-power TWT in MMW. There is extreme wide application for the circuit in high-power TWT. This development possesses important consult value to designer for MMW power amplifiers. 相似文献
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Characterized with full-metal structure, high output power and broad bandwidth, microfabricated folded waveguide is considered
as a robust slow-wave structure for millimeter wave traveling-wave tubes. In this paper, cold-test (without considering the
real electron beam) properties were studied and optimized by 3D simulation on slow-wave structure, for designing a 220 GHz
folded waveguide traveling-wave tube. The parametric analysis on cold-test properties, i.e., phase velocity, beam-wave interaction
impedance and cold circuit attenuation, were conducted in half-period circuit with high frequency structure simulator, assisted
by analytical model and equivalent circuit model. Through detailed parametric analyses, interference between specified structural
parameters is found on determining beam-wave interaction impedance. A discretized matrix optimization for interaction impedance
was effectively carried out to overcome the interference. A range of structural parameters with optimized interaction impedance
distributions were obtained. Based on the optimized results, a broadband folded waveguide with cold pass-band of about 80 GHz,
flat phase velocity dispersion and fairly high interaction impedance was designed for a 220 GHz central frequency traveling-wave
tube. A three-dB bandwidth of 20.5 GHz and a maximum gain of 21.2 dB were predicted by small signal analysis for a 28 mm-long
lossy circuit. 相似文献
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一种新型毫米波集成波导微带转换的分析与设计 总被引:1,自引:0,他引:1
提出一种新型集成于单层微带基片的毫米波集成波导微带转换 ,由一圆形微带谐振器、微带共面波导探针组成。利用全波分析软件对该转换器进行了分析计算、优化设计。测试了波导微带转换实物 ,结果表明 ,在Ka波段在 1 GHz频带内 ,该波导微带转换具有较低的插入损耗 ( <0 .4d B)和反射损耗 ( <-1 4d B)。可满足相关毫米波微带集成电路系统的应用要求。 相似文献
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Shunkang Liu 《Journal of Infrared, Millimeter and Terahertz 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
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文中介绍了微带波导转换、一分八和一分三波导功分网络。利用国产15 W GaN功率单片,首先设计8路波导功率合成,然后进行3路波导功率合成,最后构成24路合成。在毫米波频段2 GHz带宽内,整体24路波导功率合成网络合成损耗<0.8 dB,合成效率达到83%,解决了传统合成电路合成效率随合成网络级数增加而下降的问题,满足了高效率与大功率的要求。 相似文献
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A general dispersion relation for slow wave cyclotron traveling wave interaction in a folded waveguide is derived from a fluid dynamical treatment. The serpentine structure is formed by folding a double-ridged rectangular waveguide so that the orientation of the magnetic field changes (H-plane bend) instead of the conventional E-plane bend configuration. The H-plane bend structure has the potential for the production of high power, broad band radiation. For a cold beam, the linear theory predicts a gain of 2.0-2.5 dB/cm and a bandwidth of 20-25% in the millimeter wave frequencies. The bandwidth is sensitive to the axial velocity spread of the beam. The bandwidth decreases to 10% at δυz/υz=3%. Means to suppress the backward wave oscillations have to be applied for using the full bandwidth 相似文献
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V. V. Komarov A. I. Korchagin V. P. Meshchanov N. F. Popova 《Journal of Communications Technology and Electronics》2017,62(9):984-989
The designs of miniature waveguide loads of the millimeter wave band, that ensure an acceptable matching in a wide frequency band are proposed. Microwave one-ports with the volume-inhomogeneous dissipative filling are analyzed and optimized using 3D numerical models. Three experimental sample loads covering a frequency band of 53.57?178.4 GHz are fabricated and studied. 相似文献
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简要叙述了回旋管和潘尼管在高频结构中使用磁控管型波导和回旋谐波工作的进展,对两种管于(用圆波导磁控管型波导为高频电路)在工作原理上以及谐波工作性能上的主要异同点进行了比较。提出潘尼管将是满足毫米波通讯毫米波雷达发展所需要的先进的快波器件。 相似文献
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Shunkang Liu 《Journal of Infrared, Millimeter and Terahertz Waves》1996,17(1):121-126
The equivalent circuit and design method for a RF window in millimeter wave band are presented. Computation and experiment show that matching band of the RF window is wider. It can be used as output window for broadband millimeter wave tubes. 相似文献
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Guo Guo Yanyu Wei Lingna Yue Yubin Gong Xiong Xu Jun He Guoqing Zhao Wenxiang Wang Gun-Sik Park 《Journal of Infrared, Millimeter and Terahertz Waves》2012,33(2):131-140
This paper presents a tapered ridge-loaded folded waveguide (FWG) slow-wave structure (SWS) for broadband and high power millimeter
wave traveling wave tube (TWT). The radio-frequency characteristics including dispersion properties, interaction impedance,
S-parameters are analyzed. And based upon these results, the nonlinear large signal performance of the tapered ridge-loaded
folded waveguide TWT working in W-band is simulated by 3-D particle-in-cell code. In the same ridge length, the tapered FWG
has lower reflection and radio-frequency loss than the normal ridge-loaded FWG. Besides, the tapered ridge-loaded FWG TWT
also has higher electron efficiency and larger bandwidth, which is more suitable for millimeter-wave TWT. 相似文献