Discovery of Bragg confined hybrid modes with high Q-factor in a hollow dielectric resonator

摘要

The authors report on observation of Bragg confined mode in a hollowcylindrical dielectric cavity. A resonance was observed at 13.4 $GHz$ with anunloaded Q-factor of order $2\times10^5$, which is more than a factor of 6above the dielectric loss limit. Previously such modes have only been realizedfrom pure Transverse Electric modes with no azimuthal variations and only the$E_{\phi}$ component. From rigorous numeric simulations it is shown that themode is a hybrid mode with non-zero azimuthal variations and with dominant$E_r$ and $E_{\phi}$ electric field components and $H_z$ magnetic fieldcomponent.