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Focusing on traveling wave tube (TWT) applications, the interaction impedancebetween an electron beam and electromagnetic modes in three distinct, butrelated, corrugated waveguides that operate at millimeter waves is investigatedtogether with the role of glide symmetry. Two waveguide structures have glidesymmetry, and the irreducible Brillouin zone is related to half of the period,leading to a wide band linearity, i.e., nondispersive, property of thedispersion diagram. The investigation on the modes with longitudinal electricfield that can be excited shows that the bottom-top glide (BT Glide) symmetriccorrugated waveguide has a wide band interaction impedance, hence it is a goodcandidate for millimeter wave TWT amplifiers. Furthermore, the backwardelectromagnetic mode in such BT Glide slow wave structure is not $z$ polarized,eliminating the {risk} of backward wave oscillations.

Wide Band Interaction Impedance and Mode Excitation in Glide Symmetric Double Corrugated Waveguides for mm-wave TWTs