A filter and a duplexer with the filter

Abstract

The invention discloses a filter and a duplexer with the same. The filter includes a cavity, a cover plate with a close-over cavity, a metal resonator and a dielectric resonator. The metal resonator and the dielectric resonator are arranged in the cavity and parallel to the central axis. The filter further includes a first coupling rib and a second coupling rib which are arranged at the bottom of the cavity and connected with each other. The first coupling rib is connected with the metal resonator and is used for cutting the magnetic field of the metal resonator; the second coupling rib is used for cutting the magnetic field of the dielectric resonator so as to achieve coupling of magnetic fields between the metal resonator and the dielectric resonator. The filter is small in structural design difficulty, simple in the assembly process and good in reliability and inter-modulation performance.

Description

technical field [0001] The invention relates to a filter in the communication field, in particular to a filter and a duplexer with the filter. Background technique [0002] As a frequency selection device, filters are widely used in the field of communication, especially in the field of radio frequency communication. In the base station, the cavity filter is used to select the communication signal and filter out the clutter or interference signal outside the frequency of the communication signal. [0003] In filter design, in order to greatly improve the electrical performance index of the filter, a filter mixed with resonators of different materials is often used. Among them, the mixed design of metal resonators and ceramic dielectric resonators is the most common. In the prior art, in order to solve the problem of energy transfer between the metal resonator and the ceramic dielectric resonator, the installation direction of the metal resonator is usually perpendicular to ...

AI Technical Summary

Problems solved by technology

[0004] The inventor of the present invention finds in prior art research and practice: in prior art, in order to make metal resonator and ceramic dielectric resonator vertically installed in the cavity, wherein must have a resonator from cavity wall along Extending in the direction perpendicular to the cavity wall increases the difficulty of filter structure design, and the metal resonator and ceramic dielectric resonator are installed perpendicular to each other, the assembly process is complicated, and the reliability and intermodulation of the product are poor

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