Determination of the interaction impedance of coupled cavity slow wave structures

Connolly, D. J.

doi:10.1109/t-ed.1976.18434

Cited by 21 publications

(2 citation statements)

References 6 publications

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“…Furthermore, the formula v g = ω/ β is used to determine the group velocity in these experiments, which may make it smaller than the real value (v g = dω/dβ) in the upper band edge due to the decrease of the gradient variation of the dispersion curve in the upper band edge. Besides the high accuracy, there are some other advantages of the theoretical method compared with the equivalent circuit, including: 1) the theoretical model is valid for arbitrary mode and harmonic, whereas the equivalent circuit model requires different formulas to calculate the cavity mode and the slot mode, and the interaction impedance obtained from the circuit model was also based on the field analysis [18], and 2) except the geometric dimensions, other parameters are not required to be adjusted in the theoretical method. Conversely, in the equivalent circuit model, considering the concentration of electric field near the ferrule tips, the formula of the gap capacitance needs to be appropriately modified by adjusting some parameters, which are related to the frequency and geometric dimensions, and has a great effect on the high frequency characteristics [7], [8].…”

Section: Resultsmentioning

confidence: 99%

Theory, Simulations, and Experiments of the Dispersion and Interaction Impedance for the Double-Slot Coupled-Cavity Slow Wave Structure in TWT

Luo

Zhu

et al. 2013

IEEE Trans. Electron Devices

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In this paper, a theoretical model is presented for the double-slot coupled-cavity slow wave structure (CCSWS). By matching boundary conditions in conjunction with Green's function technique and moment method, the formulas for discussing the high frequency characteristics of the SWS, including dispersion and interaction impedance, are given. This model is validated by comparing its results of two typical double-slot CCSWS operating in X-band, one with inline slots and the other with staggered slots, with those obtained by computer simulation using Ansoft HFSS code. Comparison is also made with the experimental data as well as the equivalent circuit model of a particular double-slot CCSWS. The results show that the theoretical method strikes a better balance between the accuracy and the calculation efficiency than other methods.Index Terms-Dispersion, double-slot coupled-cavity slow wave structure, field match method, Green's function, interaction impedance.

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Section: Resultsmentioning

confidence: 99%

Theory, Simulations, and Experiments of the Dispersion and Interaction Impedance for the Double-Slot Coupled-Cavity Slow Wave Structure in TWT

Luo

Zhu

et al. 2013

IEEE Trans. Electron Devices

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“…The experimental values of the total impedance were computed using a formula given by Connolly [10]. The results are shown in Figs.…”

Section: Modification Of the Cavity Inductance And Coupling Factormentioning

confidence: 99%

Method for calculating the properties of coupled-cavity slow-wave structures from their dimensions

Carter

Liu

1986

IEE Proc. H Microw. Antennas Propag. UK

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In the development of computer models of coupled-cavity travelling wave tubes, it is necessary to have some means of calculating the properties of the slow-wave structure. Direct calculation is difficult because of the complexity of the shapes involved. One possible method makes use of the equivalent circuit representation of the slow-wave structure. In the paper it is shown that the parameters of the equivalent circuit can be calculated from the dimensions of the structure. Once these parameters are known, it is very quick and easy to compute the phase change per cavity and the interaction impedance at any frequency. The results obtained by this method are compared with those of experiment and it is shown that useful accuracy can be obtained.

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On the interaction impedance of the coupled cavity structure

Wenmiao

Jingxian

et al. 1985

J. of Electron.(China)

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Determination of the interaction impedance of coupled cavity slow wave structures

Cited by 21 publications

References 6 publications

Theory, Simulations, and Experiments of the Dispersion and Interaction Impedance for the Double-Slot Coupled-Cavity Slow Wave Structure in TWT

Theory, Simulations, and Experiments of the Dispersion and Interaction Impedance for the Double-Slot Coupled-Cavity Slow Wave Structure in TWT

Method for calculating the properties of coupled-cavity slow-wave structures from their dimensions

On the interaction impedance of the coupled cavity structure

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