cavity coupling structure

Abstract

The invention discloses a cavity coupling structure, which comprises a cavity provided with a cover plate, a joint installed on the side wall of the cavity and communicated with the cavity, at least one resonator, a conductive part and at least one set in the cavity Each resonator includes a resonant cavity and a resonant post fixed in the resonant cavity; one side of the conductive part is electrically connected to the joint located in the cavity, and the other side is close to the resonant post of the resonator to be electrically connected to it On the side of the conduction element facing away from the resonance column, there is an adjustment element that penetrates through the cover plate and goes deep into the resonance cavity corresponding to the resonance column. The axial movement of the adjustment element causes the relative positional relationship between the conduction element and the resonance column to change. Through the above method, the coupling strength between the conductive element and the resonant column can be adjusted, thereby adjusting the bandwidth of the filter port of the cavity coupling structure.

Description

technical field [0001] The invention relates to the field of filters, in particular to a cavity coupling structure. Background technique [0002] In modern mobile communication technology, microwave radio frequency devices are an important part. As a basic radio frequency unit, the filter has a series of indicators such as insertion loss, out-of-band rejection, passive intermodulation and power capacity, which have an important impact on the performance of the whole machine. Due to its own loss, the traditional metal coaxial cavity filter cannot obtain a high quality factor (Q value) when the cavity size is limited, resulting in certain restrictions on indicators such as out-of-band rejection and insertion loss. In addition, silver plating on the metal surface will also have a certain impact on the passive intermodulation index. [0003] The dielectric filter has a high Q value and stable full-temperature characteristics, which improve the performance of the dielectric fil...

AI Technical Summary

Problems solved by technology

Due to its own loss, the traditional metal coaxial cavity filter cannot obtain a high quality factor (Q value) when the cavity size is limited, resulting in certain restrictions on indicators such as out-of-band rejection and insertion loss. And the metal surface silver plating treatment and other links will also have a certain impact on the passive intermodulation index

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