Whispering gallery mode resonance in an elliptic dielectric disk for millimeter through optical wave application

Resonance characteristics and field distribution of the Whispering Gallery (W.G.) mode in an elliptic dielectric disk are investigated by three dimensional analysis and X-, K-band model experiments. Resonance frequency and order of resonance are obtained by integration of a local phase constant of the elliptic disk. In the analysis, an assumption is introduced that the local phase constant is regarded as equal to a circumferential phase constant of the W.G. mode on a circular disk that is inscribed to the elliptic one. Results of the analytical study of resonance frequency of the elliptic disk W.G. mode are well confirmed by experiments.