Helical slow-wave structure has been widely used to obtain broad in TWTs. Its excellent wide-band characteristic is applied continuously to commercial communications and military radar so urces as known as helix-TWTs, however, the impedance matching of the helix circuit with input or output transmission lines is still important issue to be operated with low reflection. In this paper, it is calculated using an equivalent circuit theory to obtain broad-band, and the analysis will be presented in detail with the theoretical methods on characteristic impedance of helix and matching of the circuit to the coaxial transmission line with a vacuum window.
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