径向非均匀磁场下的磁控管工作性能模拟
Simulation of operating performance of oven magnetrons in radial non-uniform magnetic field
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摘要: 为了改善磁控管的输出频谱，使模拟结构更接近实际情况，考虑了磁钢和极靴的实际尺寸。用MAFIA对磁控管内的磁系统进行建模和模拟。得到的磁场纵向分布有随着径向半径的增大而增大的趋势，这种径向不均匀性与实验测试结果一致。将非均匀的径向阶梯形变化磁场分布带入腔体热测计算，模拟得到的π模工作频率2.437 GHz，实际工作频率2.450 GHz，相对偏差0.5%，并在高频谐波的抑制上获得了输出频谱的显著改善，使微波炉磁控管具有更好的电磁防护和实际应用。Abstract: 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
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