Bunching cavity with dielectric absorber for gyroklystron

The bunching cavity with dielectric absorber for gyroklystron is studied by using the mode-matching technique to build scattering matrix. By the theoretical analysis and the numerical simulation, the effect of loss dielectric absorber on Q factor and resonance characteristic of bunching cavity, and the effect of side apertures on resonance characteristic are presented. The numerical simulation shows that the bunching cavity with loss dielectric absorber can bate parasitical EH212 mode and EH311 mode effectively, but profit H01 mode at 8 mm band. When the thickness of loss dielectric absorber increases, the quality factor Q will decrease. Cold-test shows that the simulation results are in good agreement with experimental results.