Compact output structure with TE₁₁ radiated mode in magnetron with axial output

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 -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.