Theory of the two-frequency operating mode of traveling-wave tubes of the O type

The results of the analysis of harmonics of the electron beam of a traveling wave tube with the simultaneous introduction into the input of two high frequency signals of different amplitudes and frequencies are reported. The examination is interesting from the viewpoint of interesting the general problem of multifrequency operating modes of SHF (microwave) devices. There is special interest in the development of the approximation methods of analysis, which permit obtaining simple analytical relations convenient for engineering calculations.