Electromagnetic resonances of free dielectric spheres

The last few years have seen the publication of several studies of electromagnetic resonances of free dielectric samples. This is explained by the high Q factar that can be obtained with a little space-factor, when using high dielectric constant materials and a low dissipation factor (tg /spl delta/ ), The resonators used lend themselves to a number of different applications. However their use requires a good knowledge of their spectra and field configuration.