Cavity filter

Abstract

The invention discloses a cavity filter, which comprises a cavity, a cover plate, at least two resonators, a dielectric base, a capacitor structure and an adjustable capacitor screw, wherein the cover plate covers the cavity, at least two resonant cavities are formed in the cavity, and the at least two resonators are correspondingly arranged in the at least two resonant cavities respectively; the dielectric base is fixed in a cavity between two adjacent resonant cavities, the capacitor structure is installed on the dielectric base, and the first end of the capacitor structure is close to the resonator on one side of the dielectric base to form capacitive coupling and is connected with the cover plate upwards. The second end of the capacitor structure is close to the resonator on the other side of the dielectric base to form capacitive coupling, the adjustable capacitor screw is arranged on the cover plate, and the inner end of the adjustable capacitor screw extends into the cavity and is located over the capacitor structure. The one-time passing rate of batch production can be increased, and the rework and rejection rate is reduced.

Description

technical field [0001] The invention relates to the technical field of communications, in particular to a cavity filter. Background technique [0002] In view of the requirements of 5G communication on the size and weight of equipment, filters, as an important component of communication systems, must also meet the requirements of small size and light weight. At the same time, because 5G covers a wider frequency and a wider carrier, it requires a higher filter frequency and a wider bandwidth than 4G. This requirement leads to the reduction of the overall volume of the filter, the size of the resonator, etc. is greatly reduced, and the requirements for the accuracy of each component of the product are also getting higher and higher, so that the traditional capacitive coupling method cannot meet the requirements of mass production. And the size is getting smaller and smaller, which leads to the high precision of the capacitive cross-coupling not only in its own size, but also ...

AI Technical Summary

Problems solved by technology

This requirement leads to the reduction of the overall volume of the filter, the size of the resonator and so on is greatly reduced, and the requirements for the accuracy of each component of the product are also getting higher and higher, so that the traditional capacitive coupling method cannot meet the requirements of mass production.

And the size is getting smaller and smaller, which leads to the high accuracy of the size of the capacitive cross-coupling, but also higher position accuracy and installation position tooling tolerance. The current traditional solution has greatly increased the first-pass rate, rework rate and scrap rate of the product.

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