Fig. 1. Schematic diagram of slow wave structure

Fig. 2. Dispersion curve of slow wave structure

Fig. 3. Reflection on TEM mode

Fig. 4. Reflection coefficient curve of resonant reflector

Fig. 5. Q-band low magnetic field high efficiency RBWO simulation model

Fig. 6. Relationship between output power and efficiency with AK

Fig. 7. Output power and efficiency change with guide magnetic field

Fig. 8. Modulated current distribution and electron phase space plot

Fig. 9. Particle simulation results