Nonlinear evolution of compensating modes in microwave electronics

Evolution of compensating states is studied in relativistic microwave elect ron devices with distributed interaction when the amplitude of the input si gnal increases. Operation of the traveling-wave tube (TWT) in the mode of t he Kompfner signal suppression is an example of such a state. In this case, an increase in the input power that changes the detuning between the wave and the beam is accompanied by the appearance of a signal at the TWT output . In terms of normal waves, this case corresponds, for small signals, to th e coherent composition of three waves when the amplitude of the microwave f ield vanishes at the TWT output and to the misphasing of these waves when t he amplitude increases, which produces an output signal.