Coaxial cavity filter

Abstract

The invention discloses a coaxial cavity filter. The coaxial cavity filter comprises single modular cavities, resonant rods, a cover plate, tuning screws, coupling screws and filter joints, wherein the cover plate is provided with grooves, the grooves are used for installing the single modular cavities, the upper ends of the single modular cavities are fixed in the cover plate grooves so as to be enclosed with the cover plate to form resonant cavities; the multiple single modular cavities are spliced together to form connected resonant cavities so as to form a filter cavity; the resonant rods are arranged at the bottom portions inside the single modular cavities; the tuning screws and the coupling screws are arranged on the cover plate and partially extend into the resonant cavities; and the filter joints are fixed on the single modular cavities at the head end and the tail end of the coaxial cavity filter. The coaxial cavity filter does not need a filter housing, is simple in processing and assembling process and good in interchangeability and can be repeatedly used.

Description

【Technical field】 [0001] The invention relates to the technical field of communication equipment, in particular to a coaxial cavity filter. 【Background technique】 [0002] A filter is a frequency filtering device, which selects signals in the required frequency band and suppresses signals in the unnecessary frequency band. Filters are widely used in communication fields such as radio frequency and microwave. At present, the most widely used filter in the radio frequency and microwave frequency band is the coaxial cavity filter. The coaxial cavity filter has good electromagnetic shielding, compact structure, and low passband insertion loss. In the case of capacitive loading, the coaxial cavity filter can be made very small, and has a high square coefficient and high power Advantages of high capacity. figure 1 It is a three-dimensional exploded view of a typical structure of a coaxial cavity filter in the prior art, figure 2 It is a cross-sectional view of a filter in the ...

AI Technical Summary

Problems solved by technology

The weight of the existing coaxial cavity filter is mainly the filter housing, the larger the filter, the greater the proportion of the weight of the housing, which seriously restricts the cost control of the filter

Moreover, the cavity structure inside the filter is integrated with the filter housing. A defect in a certain cavity will easily lead to the scrapping of the entire product, and the scrapped product cannot be reused.

Moreover, the cover plate and the filter housing are fastened by a large number of screws, resulting in dense screw holes in the housing, complicated processing and assembly processes, high screw material costs, and the assembly of a large number of screws will also increase assembly time and reduce production efficiency.

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