RIGOROUS ANALYSIS OF SHIELDED CYLINDRICAL DIELECTRIC RESONATORS BY DYADIC GREEN-FUNCTIONS

This paper presents a rigorous approach for the calculation of resonan t frequencies of a metallic cavity loaded by a dielectric resonator. T angential fields at the air-dielectric interface are derived from dyad ic Green's functions and boundary conditions are applied. Dyadic Green 's identity and the boundary element method are used to solve the nume rical problem. In order to validate the method, resonant frequencies a re calculated for a cylindrical cavity loaded with a dielectric cylind er and compared with available results in the literature. Then resonan ce is studied for dielectric cylinder in a rectangular cavity. In the case of multiple dielectric resonators in the cavity, the coupling coe fficient is computed with an original method based on the use of symme tries.