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1.
提出了一种可应用于毫米波功率放大器中的新型慢波结构——-开敞型角向周期 加载金属柱圆波导结构,并且在互作用通道内,引入了薄环形电子注, 推导出了此时的"热"色散方程,并且对基于该新型慢波结构的行波管的 小信号增益特性进行了深入探讨.通过数值方法 研究了金属柱尺寸和电子注参数 对器件线性特性的影响. 结果表明: 通过对金属柱尺寸的适当设计, 可以获得更高的增益值. 与封闭型结构的比较结果表明, 开敞型角向周期加载金属柱圆波导结构能够 有效地提高小信号增益, 并且对带宽的影响不大. 研究结果为研制基于此新型慢波系统的毫米波行波管奠定了理论基础. 相似文献
2.
Jianqiang Wu Shenggang Liu Yuanlong Mo 《International Journal of Infrared and Millimeter Waves》1995,16(12):2181-2194
On the basis of the reference [1], excitation of Cherenkov radiation with arbitrary azimuthal mode number by a thin annular relativistic electron beam in a plasma-filled dielectric-lined slow-wave waveguide is studied in this paper. A determinantal dispersion equation is obtained. This general dispersion equation is valid for arbitrary azimuthal mode number, and the growth rate of the wave is derived from it. Finally, the effects of the background plasma density on the dispersion relation, the background plasma density and the electron beam radius on the growth rate of the wave are presented. Formulas and results offerd in this paper are general, and are of particular value of reference to the beam-wave interaction in azimuthally unsymmetrical slow-wave waveguide.This work is supported by National Natural Science Foundation of China and 863 Project. 相似文献
3.
将任意形状槽的连续轮廓近似用一系列相连的矩形阶梯近似,利用各阶梯面上导纳的匹配,以及槽与互作用区边界场的连续与匹配条件,获得了具有任意槽的矩形波导栅慢波结构的色散方程和耦合阻抗的表达式,并进行理论上的验证.加工制作了矩形槽波导栅模型,冷测表明理论值与测量值相吻合.分别求解几种特殊槽形矩形波导栅慢波结构的色散特性及耦合阻抗,其中,三角形结构的色散和耦合阻抗均最弱,而倒梯形结构色散最强,耦合阻抗最大.
关键词:
矩形波导栅
任意槽
色散特性
慢波结构 相似文献
4.
Analysis of the Coaxial Ridge-Loaded Helical Groove Waveguide 总被引:1,自引:0,他引:1
Yonghai Lan Wenxiang Wang Yubin Gong 《International Journal of Infrared and Millimeter Waves》2002,23(3):425-434
The coaxial ridge-loaded helical groove waveguide is proposed in this paper. As an all-metal slow-wave circuit, it has advantages of good heat dissipation and great size, and thus is suitable for use of millimeter TWT. By means of field theory, the expressions of the dispersion equation and the coupling impedance of the coaxial ridge-loaded helical groove waveguide are obtained. The influence of various circuit dimensions on the dispersion relation and the coupling impedance is investigated by the results of numerical computation. 相似文献
5.
A slow-wave structure (SWS) with two opposite gratings inside a rectangular
waveguide is presented and analysed. As an all-metal slow-wave circuit, this
structure is especially suited for use in millimetre-wave travelling wave tubes
(TWTs) due to its advantages of large size, high manufacturing precision and good
heat dissipation. The first part of this paper concerns the wave properties of this
structure in vacuum. The influence of the geometrical dimensions on dispersion
characteristics and coupling impedance is investigated. The theoretical results show
that this structure has a very strong dispersion and the coupling impedance for the
fundamental wave is several tens of ohms, but the coupling impedance for --1 space
harmonic wave is much lower than that for the fundamental wave, so the risk of
backward wave oscillation is reduced. Besides these, the CST microwave studio is
also used to simulate the dispersion property of the SWS. The simulation results
from CST and the theoretical results agree well with each other, which supports the
theory. In the second part, a small-signal analysis of a double rectangular
waveguide grating TWT is presented. The typical small-signal gain per period is
about 0.45 dB, and the 3-dB small-signal gain bandwidth is only 4\%. 相似文献
6.
DIELECTRIC EFFECT ON THE RADIO-FREQUENCY CHARACTERISTICS OF A RECTANGULAR WAVEGUIDE GRATING TRAVELING WAVE TUBE 总被引:2,自引:0,他引:2
Zhigang Lu Yubin Gong Yanyu Wei Wenxiang Wang 《International Journal of Infrared and Millimeter Waves》2006,27(8):1095-1108
A new type of partial-dielectric-loaded rectangular waveguide grating slow-wave structure (SWS) for millimeter wave traveling
wave tube (TWT) is presented in this paper. The radio-frequency characteristics including the dispersion properties, the longitudinal
electric field distribution and the beam-wave coupling impedance of this structure are analyzed. The results show that the
dispersion of the rectangular waveguide grating circuit is weakened, the phase velocity is reduced and the position of the
maximum E
z
is basically invariant after partially filling the dielectric materials in the rectangular waveguide grating SWS. Although
the coupling impedance decreases a little, it still keeps above 40 Ω. 相似文献
7.
The Analysis of Hole-Gap Helical Groove Waveguide 总被引:1,自引:0,他引:1
Wenxiang Wang Yonghai Lan Yanyu Wei 《International Journal of Infrared and Millimeter Waves》2000,21(10):1617-1625
The hole-gap helical groove waveguide, as a all-metal slow-wave circuit, has advantages of good heat dissipation and great size, and thus is suitable for use of mm TWT. By means of an approximate field theory, the expressions of the dispersion equation and the coupling impedance of the hole-gap helical groove waveguide is obtained in this paper. The influence of various circuit dimensions on the dispersion relation and the coupling impedance is discussed by the numerical computation. 相似文献
8.
ANALYSIS OF RECTANGULAR WAVEGUIDE GRATING SLOW-WAVE STRUCTURE WITH THE ARBITRARY SHAPED GROOVES 总被引:2,自引:0,他引:2
Zhigang Lu Yubin Gong Yanyu Wei Yu Huang Wenxiang Wang 《International Journal of Infrared and Millimeter Waves》2006,27(6):791-807
The rectangular waveguide grating slow-wave structure (SWS) with arbitrary shaped grooves is presented and analyzed in this
paper. As an all-metal slow-wave circuit, it has properties that can be used in high-power millimeter-wave or sub-millimeter
wave traveling wave tube (TWT). The unified dispersion equation and the expression of coupling impedance are obtained in this
paper by means of an approximate field-theory analysis, in which the profile of the groove is approximately replaced by a
series of steps and the field continuity at the interface of two neighboring steps together with the field matching conditions
at the interface between the groove region and the interaction region are employed. A rectangular groove SWS was manufactured
and the cold measurement was made. The experimental data are in good agreement with the numerical calculation. The derived
transcendental equations are resolved numerically for four classical structures such as rectangular, dovetail, ladder and
cosine. Finally, taking the rectangular waveguide grating SWS with rectangular grooves for example, the influences of physical
dimensions on dispersion relation and coupling impedance are discussed. 相似文献
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The disk-loaded waveguide with bandwidth of only 2%-8% is a kind of narrow band structure. A new rib-loaded disk-loaded waveguide with wider bandwidth than the general one is suggested in the paper. The author develops the method of calculating the axial periodic waveguide by expanding the slow-wave structure's boundary function in Fourier series, so that it can be adopted in rib-loaded disk-loaded waveguide. By the method, the dispersion characteristics and interaction impedance of a Ka band rib-loaded disk-loaded waveguide are analyzed. 相似文献
11.
从麦克斯韦方程和流体理论出发,推导了填充磁化等离子体慢波结构的基本方程.在大磁场情况下,对等离子体填充盘荷波导的色散特性和耦合阻抗作了研究,结果表明填充等离子体使色散曲线上移,耦合阻抗提高.等离子体填充产生出模式谱非常丰富的周期性低频等离子体模式(TG模式).当等离子体密度增加到一定程度后,场模TM01模的频率范围和TG01模的频率范围相近,两个模式互相耦合产生出新的混合模G1,G2.如果相对论行波管工作在混合模上,将会产生新的工作机理.
关键词:
盘荷波导
等离子体填充
色散特性
相对论行波管 相似文献
12.
The folded double-ridged waveguide structure is presented and its properties used for wide-band traveling-wave tube are investigated.Expressions of dispersion characteristics,normalized phase velocity and interaction impedance of this structure are derived and numerically calculated.The calculated results using our theory agree well with those obtained by using the 3D electromagnetic simulation software HFSS.Influences of the ridge-loaded area and broad-wall dimensions on the high frequency characteristics of the novel slow-wave structure are discussed.It is shown that the folded double-ridged waveguide structure has a much wider relative passband than the folded waveguide slow-wave structure and a relative passband of 67% could be obtained,indicating that this structure can operate in broad-band frequency ranges of beam-wave interaction.The small signal gain property is investigated for ensuring the improvement of bandwidth.Meanwhile,with comparable dispersion characteristics,the transverse section dimension of this novel structure is much smaller than that of conventional one,which indicates an available way to reduce the weight of traveling-wave tube. 相似文献
13.
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
14.
对曲折圆形槽波导新型慢波系统的高频特性进行了研究,通过理论分析和数值计算,得到了它的色散曲线和耦合阻抗表达式,并分析了结构参数变化对色散特性和耦合阻抗的影响。研究表明:当周期变小时色散减弱,耦合阻抗增加;而增大直波导长度时色散变弱,但同时耦合阻抗也会下降。因此较小的周期有利于改善曲折圆形槽波导慢波电路的高频特性。鉴于这种电路的耦合阻抗较低,可以适当地减小直波导长度来提高耦合阻抗。曲折槽波导结合了曲折波导散热能力强、色散特性好、容易加工和槽波导单模工作、低损耗、大尺寸等优点,在毫米波及亚毫米波段的行波管中具有较好的发展前景。 相似文献
15.
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
16.
介绍了用德国CST公司提供的MWS 4.2软件模拟计算色散特性和耦合阻抗的理论方法,对内开槽矩形波导栅结构的高频特性进行了数值模拟。结果表明:在传统矩形波导栅结构的基础上,开槽后的矩形波导栅结构比开槽前的相速更低,用作行波管的慢波结构时,可降低工作电压,工艺上容易实现,而且耦合阻抗均在45 W以上,满足毫米波行波管的要求;在内开槽宽度一定的前提下,槽深、栅间距和栅周期的增大对降低系统相速有利。 相似文献
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Dielectric effect on the rf characteristics of a helical groove travelling wave tube 总被引:1,自引:0,他引:1
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A new type of partial-dielectric-loaded helical groove slow-wave structure (SWS) for millimetre wave travelling wave tube (TWT) is presented in this paper.The radio-frequency characteristics including the dispersion properties,the longitudinal electric field distribution and the beam-wave coupling impedance of this structure are analysed.The results show that the dispersion of the helical groove circuit is weakened,the phase velocity is reduced and the position of the maximum Ez is moved from the mouth to the inside of the groove after partially filling the dielectric materials in the helical groove SWS.Therefore,the dielectric-loaded helical groove SWS is suitable for a multi-beam TWT with broad band and high gain. 相似文献