RESONATOR, FILTER, COMMUNICATION APPARATUS, AND RESONATOR FABRICATION METHOD

The present application provides a resonator, a filter, a communication apparatus, and a resonator fabrication method. Specifically, the resonator comprises a dielectric cover, a dielectric cylinder and a cavity, wherein the cavity is provided with an upper end opening. The cavity comprises a bottom portion and a side wall; the dielectric cylinder is erected on the bottom portion, and a blind hole provided on an outer surface of the cavity is provided under the bottom portion; the position of the blind hole corresponds to the position of the dielectric cylinder; and the height of the dielectric cylinder is not higher than the height of the side wall. Then, the dielectric cover is disposed on the upper end opening of the cavity so as to seal the upper end opening and form an overall resonator, an outer surface of the overall resonator having a metallization layer. By means of experiments, it has been proven that with the same resonator volume, compared with the existing technology, the q-value is higher, and t