A high-efficiency relativistic magnetron with a novel all-cavity extraction structure

Relativistic magnetrons (RMs) are one of the most promising high power microwave devices. A high-efficiency relativistic magnetron (HERM) with a novel all-cavity extraction structure is presented and investigated theoretically and numerically in this paper. Compared with conventional RMs with an all-cavity extraction structure, the HERM has three improved features. First, a single stair is introduced into the HERM. Second, the angular width of the extraction structure is bigger than that of the anode slow-wave structure. Third, the extraction port is set behind the anode vanes in the axial direction instead of being set between two anode vanes. These improved features can enhance the extraction efficiency of the HERM. The typical simulation results are as follows: high-power microwaves of the transverse electromagnetic mode are generated with a peak power of 1.65 GW, a frequency of 1.61 GHz, and a power efficiency of 67.6%, when the voltage is 586 kV and the current is 4.19 kA. The simulation results verify the validity of the novel all-cavity extraction structure.