Amplifier millitron with multistage staircase slow wave structure, placed in the waveguide with hollows, and with three-beam electron flow is described. The results of calculation of dispersion characteristics of staircase slow wave structure of three modification are cited. The possibility of the broadening of bandwidth more than two times is shown.
A. Ya. Belukha, A. Ya. Belukha,
"Millitron with broaded amplification band", Proc. SPIE 1929, 17th International Conference on Infrared and Millimeter Waves, 19296A (14 December 1992); doi: 10.1117/12.2298343; https://doi.org/10.1117/12.2298343