| 摘要 |
The present invention provides a resonator, including: a resonant cavity casing, a cover that covers an open end of the resonant cavity casing and is connected to the resonant cavity casing, a resonance tube located inside a resonant cavity, and a tuning screw, where the tuning screw is connected to the cover and stretches into space encircled by the resonance tube, the resonator further includes a dielectric material that is filled in the resonant cavity and whose dielectric constant is greater than 1, and the dielectric material is filled in a capacitance area formed between the top of the resonance tube and the cover. The present invention further provides another resonator, where a tuning rod of the resonator is rotatable relative to a dielectric material filled in a resonant cavity, and face-to-face surfaces of the tuning rod and the dielectric material are a non-circular structure, so that the tuning rod can adjust a frequency when being rotated relative to the dielectric material. According to the resonator provided in the present invention, a conductor loss can be reduced, a dielectric loss does not increase greatly, and costs are relatively low. The present invention further provides a filter, a duplexer, and a multiplexer that use the resonator. |
