Elliptic function low-path filtering path and communication cavity device adopting same

Abstract

Disclosed is mainly an elliptic function-type low-pass filter, which is arranged in a metal cavity. The metal cavity is provided with multiple sub-cavities connected sequentially. A resonant column is provided between two adjacent cavities. The resonant columns are provided on top thereof with a conductor rod. The conductor rod is provided with through holes at where each resonant column corresponds to. The resonant columns are each provided with a tuning screw passing through the corresponding through hole and penetrating deeply into the resonant column to allow capacitive coupling between the tuning screw and the resonant column. Two ends of the conductor rod respectively form two connection ports. The elliptic function-type low-pass filter of the present invention has great electrical specifications, a novel and unique structure, and is convenient for processing and mass production. A communication cavity component formed by employing the filter is capable of generating improved out-of-band rejection within an expanded range of frequency bands, thus meeting the requirement for increased degree of isolation between communication systems.

Description

【Technical field】 [0001] The invention relates to a communication cavity device for performing low-pass filtering on communication signals, in particular to an elliptic function type low-pass filtering path. 【Background technique】 [0002] With the development of triple play integration and the use of LTE frequency bands, compared with traditional frequency bands, new frequency bands are moving towards lower and higher directions. With the introduction of new standards or systems, the market has higher and higher requirements for passive components. [0003] For low-pass filters, the traditional implementation is generally Chebyshev type, such as the common candied fruit-shaped low-pass filter, which has the advantages of simple structure and easy implementation, but the disadvantage is that the out-of-band decline is slow and the out-of-band rejection The consistency of low and filtering characteristics depends on the precision of processing and assembly. Such a low-pass ...

AI Technical Summary

Problems solved by technology

[0003] For low-pass filters, the traditional implementation is generally Chebyshev type, such as the common candied fruit-shaped low-pass filter, which has the advantages of simple structure and easy implementation, but the disadvantage is that the out-of-band decline is slow and the out-of-band rejection The consistency of low and filtering characteristics depends on the precision of processing and assembly

Such a low-pass filter is often used to suppress the far-end out-of-band, and in general, it cannot meet the requirements of high isolation between actual systems

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