Theoretical analysis and simulation of resonant system of high power continuous wave magnetron

Resonant frequencies of a 12-cavity magnetron with sector-and-slot cavities are calculated by both simulation and field theory derived by sector-step approximation method. Besides, the effects of main structure dimension of sector-and-slot cavity on π-mode resonant frequency and mode separation are analyzed by the given field theory. Results show that the theory results are consistent well with simulation results and the relative error is less than 1%. Π-mode resonant frequency increases with the increasing of slot length and slot width. In addition, mode separation increases with the increasing of slot width. And with the increasing of slot length, the mode separation decreases at first and then goes to stable state.