CAVITY FILTER

摘要

A cavity filter is provided in the embodiments of the invention, relating to the field of communication, with the function of simplifying the assembling techniques and enhancing the reuse rate of moulds. The cavity filter includes the following parts: a cavity, including at least two resonant elements, each resonant element including a resonance single cavity and a resonator; a cover plate; through-holes set in the cover plate and led to the cavity; a coupling unit, two protruding ends of the coupling structure of whom extend into the two resonant elements with preset coupling relations in the cavity through the though-hole, to implement the coupling relations of the two resonant elements with preset coupling relations, wherein the central connecting line of the two protruding ends of the coupling structure is parallel to the plane containing the axis of the resonators of the two resonant elements, and the coupling structure is a capacitive coupling structure or an inductive coupling structure. The cavity filter provided in the embodiments of the invention is used for band-pass filtering in wireless communication.