Resonating structure for a dielectric filter comprising a dielectric body including offset first and second blind coupling holes for adjusting the coupling strength there between

A dielectric filter comprising:

• a resonating structure, wherein the resonating structure including:
• a body made of a solid dielectric material, comprising at least two resonators;
• at least one set of capacitive coupling holes formed in the body and disposed between two resonators of the at least two resonators, wherein each set of capacitive coupling holes comprising a first blind hole extending inward from one surface of the body and a second blind hole extending inward from an opposite surface of the body, wherein the first blind hole and the second blind hole are offset from each other in a plane perpendicular to a direction along which the first blind hole or the second blind hole is disposed, and wherein the first blind hole and the second blind hole are overlapped with each other in an elongation direction, in which an amount of overlap between the first blind hole and the second blind hole is set to adjust a coupling strength of capacitive coupling between the two resonators;
• and
• a conductive material layer covering an outer surface of the body and portions of the one surface and the opposite surface of the body forming the first blind hole and the second blind hole.