RESEARCH ON EIGEN-MODE OF COAXIAL OUTER CORRUGATED RESONATOR

For the coaxial outer corrugated resonator, dispersion equations of TE and TM modes are derived by the surface impedance theory, and the flrst order transmission line equations with mode coupling coe-cients are deduced by means of the transmission line and coupling wave theory. According to them, resonant frequency, difiractive quality factor and fleld proflle of geometry of the eigen- mode about the coaxial outer corrugated resonator can be calculated. The efiect of outer slot depth, tooth width as well as asymptotic angle of outer conductor and slope angle of inner conductor on resonant frequency and quality factor can be researched. Results show that changes of the outer slot depth and tooth width slightly afiect the fleld frequency and quality factor and that the changes of the asymptotic angle of outer conductor and slope angle of inner conductor almost do not afiect fleld frequency, but greatly afiect quality factor.