Whispering-gallery modes of nonuniform dielectric resonators

New results of theoretical and experimental investigations of nonuniform dielectric resonators (DRs) with higher-order azimuthal waves (whispering-gallery modes) are presented. The frequency splitting and modal coupling phenomena are studied. The effect of the space-frequency field separation of the modes is found. Application of nonuniform dielectric resonators for the study of various materials (semiconductive and dielectric plates and films, high-Tc superconductors), and for the design of millimeter-wave filters and oscillators is proposed. © 1995 John Wiley & Sons, Inc.