共查询到20条相似文献,搜索用时 31 毫秒
1.
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
2.
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
3.
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
4.
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
5.
This paper investigates the properties of traveling wave-beam
interaction in a rectangular helix traveling-wave-tube (TWT) for a
solid sheet electron beam. The `hot' dispersion equation is obtained
by means of the self-consistent field theory. The small signal
analysis, which includes the effects of the beam parameters and
slow-wave structure (SWS) parameters, is carried out by
theoretical computation. The numerical results show that the
bandwidth and the small-signal gain of the rectangular helix TWT
increase as the beam current increases; and the beam voltage not obviously
influences the small signal gain. Among different
rectangular helix structures, the small-signal gain increases as the
width of the rectangular helix SWS increases, however, the bandwidth
decreases whether structure parameters a and L or ψ and L
are fixed or not. In addition, a comparison of the small-signal gain
of this structure with a conventional round helix is made. The
presented analysis will be useful for the design of the TWT with a
rectangular helix circuit. 相似文献
6.
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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Radio-Frequency Characteristics of a Printed Rectangular Helix Slow-Wave Structure 总被引:1,自引:0,他引:1 下载免费PDF全文
A new type of printed rectangular helix slow- wave structure (SWS) is investigated using the field-matching method and the electromagnetic integral equations at the boundaries. The radio-frequency characteristics including the dispersion equation and the coupling impedance for transverse antisymmetric (odd) modes of this structure are analysed. The numerical results agree well with the results obtained by the EM simulation software HFSS. It is shown that the dispersion of the rectangular helix circuit is weakened, the phase velocity is reduced after filling the dielectric materials in the rectangular helix SWS. As a planar slow-wave structure, this structure has potential applications in compact TWTs. 相似文献
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提出了一类新型毫米波大功率微波器件——脊加载曲折波导行波管,推导出了引入电子注后的"热"色散方程.通过数值求解此方程,研究了加脊尺寸和电子注参数对小信号增益影响.计算结果表明:通过适当的尺寸设计和工作参数的选择,此结构在Kα波段具有18.51%的3 dB增益带宽和1.15 dB/周期的增益;相比于常规曲折波导结构,脊加载结构在保证一定带宽的情况下,具有更高的增益和电子效率;为了进一步提高增益,可以适当增加脊宽度和高度,也可在一定范围内增加电子注电流.
关键词:
毫米波
曲折波导
脊加载
小信号增益 相似文献
13.
Dielectric effect on the rf characteristics of a helical groove travelling wave tube 总被引:1,自引:0,他引:1 下载免费PDF全文
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
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用阶梯近似的方法分析任意槽形加载的圆波导慢波系统,利用各阶梯相邻面的导纳匹配条件 以及中心互作用区与加载区的场匹配条件,获得了任意槽形加载周期慢波结构的统一色散方 程. 利用该色散方程,得到色散特性与CST MWS仿真软件模拟结果良好符合. 分别求解几种 特殊槽形加载慢波结构的色散特性及耦合阻抗,其中,三角形结构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:
任意槽形
慢波结构
色散特性
行波管 相似文献
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为解决正交场返波管太赫兹源慢波结构的设计问题,研究了开放式单排矩形梳齿慢波结构的色散及耦合阻抗特性并给出了设计思路及结果。利用单模近似法和数值计算得到了各几何参数对慢波结构性能的影响。结果表明:慢波周期长度可相对独立地优化耦合阻抗;设计慢波结构时可根据工作频率、加工工艺和电子枪性能确定其余三个几何参数,主要是对慢波周期长度进行调节。进一步的数值计算给出了梳齿间距在0.010~0.025 mm范围内、工作频率在300~420 GHz范围内的开放式矩形梳齿慢波结构的具体尺寸。利用粒子模拟软件对一个设计结果进行了仿真,得到的工作频率验证了冷腔分析的结果。 相似文献
19.
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