Novel low pass filtering pathway and communication cavity device with same

Abstract

Disclosed are a novel low-pass filtering path and a communication cavity device using the same. The novel low-pass filtering path comprises a metal cavity and a cover plate for covering the metal cavity. A plurality of sub-cavities which are sequentially communicated with one another is arranged inside the metal cavity. A connecting window is provided between every two adjacent sub-cavities. A conductor rod is provided in the metal cavity and sequentially penetrates the sub-cavities which are communicated with one another. Resonance rods are provided on the conductor rod corresponding to the connecting windows, wherein the resonance rods penetrate the conductor rod, and rod bodies of the resonance rods protrude towards the cover plate. Threaded holes corresponding to the resonance rods are provided on the cover plate. A group of tuning screw rods in which mounting holes are formed penetrate the threaded holes and extend into the cavity to be in capacitive coupling with the corresponding resonance rods. Medium sleeves are fitted in the mounting holes. The novel low-pass filtering path and the communication cavity device using the same provided by the present invention are advantageous in excellent electrical specifications, external tuning, and convenience in processing and batch production. By means of the communication cavity device using the path, strong inhibition can be produced in a wide out-of-band frequency band range, and the requirement for high isolation between communication systems can be satisfied.

Description

technical field [0001] The invention relates to a communication cavity device for performing low-pass filtering on communication signals, in particular to a novel low-pass filter path that can be tuned externally and a communication cavity device using the path structure, such as filters, combiners and Diplexer. 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 developing in two directions: lower and higher. With the introduction of new standards or systems, the market has higher and higher requirements for passive components. [0003] As passive communication devices, combiners, duplexers and filters are widely used in the field of communication, especially in the field of radio frequency communication. With the addition of TV systems and video-on-demand systems to communication system channels, a high-performance low-pass filter is required. ...

AI Technical Summary

Problems solved by technology

[0004] 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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