Influence of an elliptical non-uniformity of dielectric sphere on spectral characteristics of resonance oscillations

The spectral task is solved for open prolate spheroid that made from homogeneous isotropic crystal and has small distance between its focuses. The approximate dispersion equation is obtained at satisfaction of the tangential component continuity conditions of electromagnetic field strengths for resonance oscillations on the spheroid surface. It allows to study spectral characteristics of resonance oscillations.