Computations of the characteristics of the symmetric mode of the connected-ring structure are presented with emphasis on those properties useful in the design of high-power traveling-wave tubes. These compu¬tations, based on a theory developed by Chodorow and Chu are compared with experimental results. In particular, the comparison between theoretical and experimental u) - 3 plots and impedances is presented over a wide range of parameters. The effect of tape thickness is ignored in the computations, although some experimental results on structures with various thicknesses are compared with the computations assuming zero tape thick¬ness. Impedances are also compared with those of a circuit having ideal fields. The curves show, qualitatively, that the smaller the connector tape width and the larger the gaps, the higher the impedance and the less the dispersion. These advantages could, in practice, only be achieved at the expense of making the structure less rugged, and less able to dissi¬pate heat. The space-harmonic content of the symmetric mode is shown.
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