A design of high‐Q dielectric resonators for MIC applications

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Abstract
A design method of radiation‐suppressed high‐Q dielectric resonators with a metal cap loaded above a dielectric material with high dielectric constant is studied. For exact evaluation of the effect of the radiation‐suppressing metal cap, a semispherical dielectric resonator model with simplified boundary conditon of the metal cap is introduced. As a result, it is found that there exist two modes in this resonator, a dielectric resonator mode and a hollow cavity mode, depending on the size (diameter) of the metal cap, and almost constant resonant frequencies for the change of metal cap size and high unloaded Q factors are obtained in the dielectric resonator mode by selecting the cap size on the optimum range. the validity of the analysis result is confirmed by experiment. Moreover, the resonant frequency and its temperature variation for a cylindrical resonator are studied and it is found that the frequency variation does not depend on the material of the metal cap but greatly depends on the temperature coefficient of the high‐constant dielectric material itself.

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