提出了一种用于轴向输出相对论磁控管中具有TE11辐射模式的紧凑型输出结构。该器件采用6谐振腔结构并工作在π模式上,通过合理设计谐振腔结构与输出圆波导之间过渡结构,模拟实现了圆TE11模式微波的轴向输出。与传统衍射输出相对论磁控管相比,本文设计的轴向输出结构,不仅能在输出波导中获得更加纯净的微波模式,而且能减小磁控管的径向尺寸,使得系统更加紧凑化。初步的粒子模拟结果表明：当电压为280 kV、磁场强度为0.5 T时,该器件的工作频率为4.18 GHz,输出功率为247.0 MW,功率转换效率达到21.9%。

A compact output structure with TE11 radiated mode in a relativistic magnetron with axial output is proposed. In the device, through adopting a basic structure of 6 resonant cavities operating in the π-mode and designing an axial output structure between the structure of resonant cavities and the cylindrical waveguide properly, a TE11 radiated mode can be obtained in the cylindrical waveguide. Compared with the relativistic magnetron with diffraction output, the structure proposed in this paper provides a much purer radiated mode in the output waveguide, and makes the diameter of the device minimized. In the three-dimensional particle-in-cell (PIC) simulation, the power conversion efficiency can reach 21.9%, corresponding to an output power of 247.0 MW and a resonant frequency of 4.18 GHz, under the condition of the applied voltage of 280 kV and the applied magnetic field of 0.5 T.