Design of a compact S-band relativistic magnetron operating at low magnetic field
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摘要: 针对高功率微波器件的低磁场小型化发展需求，设计了工作在S波段的低磁场紧凑型相对论磁控管，建立了三维仿真模型。设计衍射输出结构，输出模式为TE11模。在圆波导中TE11模具有最小的截止半径，因此选取TE11模输出比高阶模输出具有更小的波导半径。分析了磁控管的输出性能随磁场、输出波导半径和倾斜角的变化规律。在磁场0.34 T、电压352 kV条件下，模拟仿真结果显示磁控管输出功率达到567 MW，功率转换效率为62.5%，在频率为2.37 GHz时波导半径仅为77.5 mm。Abstract: For compact high-power microwave devices operating at low magnetic field, a compact S-band relativistic magnetron operating at low magnetic field was designed and simulated with three-dimensional particle-in-cell codes. This tube radiates TE11 mode in circular waveguide with diffraction output structure. As the cutoff radius of TE11 mode is the smallest in circular waveguide, compared with higher modes, the radius of the output waveguide could be reduced obviously. The output performance as a function of magnetic field, radius of waveguide and angle was studied. Typical simulation results show that microwave power of 567 MW was generated at 2.37 GHz when the voltage and magnetic field were 352 kV and 0.34 T, the power conversion efficiency was 62.5%, and the radius of waveguide was only 77.5 mm.
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Key words:
- magnetron /
- S-band /
- axial diffraction output /
- TE11 mode /
- PIC simulation
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图 2 轴向输出相对论磁控管结构示意图
Figure 2. Schematic of the axial extraction relativistic magnetron
图 3 衍射输出相对论磁控管结构图
Figure 3. Configurations of relativistic magnetron with diffraction output
图 9 输出参数随输出波导半径变化关系
Figure 9. Relationship between output parameters and radius of output waveguide
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