Numerical study of axisymmetric dielectric resonators

In this paper, we present an effective approach to study the behavior of ax isymmetric dielectric resonators. This approach is based on the finite-diff erence time-domain method and two accompanying techniques in order to incre ase the accuracy and decrease the computational cost. These two techniques are the fast-Fourier-transform approach and the Pade method. This method is used to obtain the resonant frequencies and quality factors for several re sonators. Comparisons are made to show the utility of the method.