RESONATOR, FILTER, DUPLEXER, MULTIPLEXER AND COMMUNICATION DEVICE

摘要

The present invention provides a resonator, where the resonator includes: a resonant cavity body that has a resonant cavity and an open end, a cover that covers the open end and that is connected to the resonant cavity body, and a resonant tube that is located inside the resonant cavity; the resonator further includes a medium material that is padded in the resonator cavity and whose dielectric constant is greater than 1, the resonant tube includes a resonant tube body and an elastic structure that is combined with the resonant tube body, the medium material is padded in a capacitor area in the resonant cavity, and the elastic structure provides elastic pressure in an axial direction of the resonant tube, so that an upper end face of the medium material is in close contact with a lower surface of the cover and a lower end face of the medium material is in close contact with an upper surface of the resonant tube. The resonator provided in the present invention can reduce a conductor loss and improve a power capacity, and has relatively low costs. The present invention further provides a filter, a duplexer, a multiplexer, and a communications device that use the resonator.