S波段低磁场紧凑型相对论磁控管设计

Design of a compact S-band relativistic magnetronoperating at low magnetic field

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TE_(11)模。在圆波导中TE_(11)模具有最小的截止半径,因此选取TE_(11)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。

For compact high-power microwave devices operating at low magnetic field,a compact S-bandrelativistic magnetron operating at low magnetic field was designed and simulated with three-dimensional particle-in-cell codes.This tube radiates TE_(11) mode in circular waveguide with diffraction output structure.As the cutoff radius ofTE_(11) mode is the smallest in circular waveguide,compared with higher modes,the radius of the output waveguidecould be reduced obviously.The output performance as a function of magnetic field,radius of waveguide and anglewas studied.Typical simulation results show that microwave power of 567 MW was generated at 2.37 GHz when thevoltage and magnetic field were 352 kV and 0.34 T,the power conversion efficiency was 62.5%,and the radius ofwaveguide was only 77.5 mm.