STUDY ON CYLINDRICAL CAVITY COUPLING WITH RECTANGULAR WAVE-GUIDES BY LARGE APERTURES

The structure of cylindrical cavity coupling with rectangular waveguid es through large apertures on the cavity's sidewall is studied in deta il. The fields in the cavity is properly expanded by derived mode func tions. By making reasonable approximation of the boundary conditions, the process of derivation and the formation of the characteristic equa tion is greatly simplified. The characteristic equation and model coef ficients are obtained. The reliability of the derived characteristic e quation is tested. Numerical results of characteristic frequency and q uality factor changing with dimensions of coupling holes are given.