Simulation of operating performance of oven magnetrons in radial non-uniform magnetic field

To improve the output spectrum of magnetron and make simulated model near to the practical structure, considering the practical structure of the permanent magnet and soft magnet, the magnetic field system of microwave oven magnetrons was modeled and simulated using MAFIA. The radial non-uniform magnetic field distribution is obtained. The longitudinal magnetic field is increasing along the radial direction in the anode cavity. The trend is consistent with the experimental data. In the condition of the radial non-uniform magnetic field, the cavity hot-test simulation is done to obtain the π mode frequency 2.437 GHz. Compared with oven's work frequency 2.450 GHz, the relatively error is 0.5%. The remarkable improvement is achieved in suppressing the RF harmonic content, making the radiaton