IEEE Transactions on Antenns and Propagation,
in press, 1998
Chi-Chih Chen, Student Member
ElectroScience Laboratory
Department of Electrical Engineering
The Ohio State University
1320 Kinnear Road
Columbus, OH 43212
The electromagnetic complex natural resonances (CNR) for lossless dielectric spheres immersed in a lossless dielectric medium are investigated. Significant difference between the external and internal resonances are presented. The external resonances are related to the external creeping waves whereas the internal resonances are caused by the internally reflected bouncing waves. The internal resonances are more important in practice because their smaller damping factors. Their damping is a function of the relative permittivity of the sphere.