Complex response function of whispering gallery dielectric resonators

A whispering gallery resonator coupled to a dielectric waveguide is experim entally investigated around 86 GHz using a vectorial network analyzer. The resulting complex response function is compared with a theoretical model, s implified assuming negligible stationary waves; indeed their presence can b e effectively compensated by a proper normalization procedure, made possibl e by a suitable analysis in the complex field. It is demonstrated that the proposed approach well reproduce the experimental results in a wide range o f coupling conditions. Moreover, some outcomes of the model concerning the power flowing into the resonator are briefly discussed.