Communication cavity device and elliptic function low-pass filter path

Abstract

The present invention discloses an elliptic function low-pass filter path which is applied to a communication cavity device such as a mixer, a duplexer, a filter and the like. The elliptic function low-pass filter path comprises a cavity and a cover which covers the cavity. The cavity is provided with a vertical long cavity, and two sides of the cavity along a vertical long direction are respectively provided with two connecting ports. The cavity is provided with a conductor rod used for realizing electric connection between the two connecting ports. Along a conductor rod vertical long direction, the conductor rod is provided with a plurality of fixed-tuned discs. Each fixed-tuned disc is provided with an active-tuned disc correspondingly. Each active-tuned disc is connected with a corresponding tuning screw which passes through the cover. The fixed-tuned discs and the active-tuned discs are not contacted to facilitate capacitive coupling. The elliptic function low-pass filter path has the characteristics of simple structure, a flexible realization mode, good electrical performance and the like.

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 the integration of three networks, the market puts forward the demand for the combination of cable TV system, video-on-demand system and mobile communication system, WLAN and other systems. Since the above-mentioned systems require a high degree of isolation, a high-performance low-pass filter is required to realize the access of the cable TV system and the video-on-demand system. Inhibition. Due to the limitations of its implementation, the traditional low-pass filter cannot meet the market requirements due to the transition bandwidth and low out-of-band rejection, and a new implementation method needs to be introduced. [0003] Patent application CN201110247335.X submitted on August 24, 2011 discloses an ellipti...

AI Technical Summary

Problems solved by technology

However, for scenes with narrow transition bands and high out-of-band suppression, it is not perfect.

For example, if there is a passband of 0-1600MHz, the insertion loss is expected to be controlled below 1.0dB, and the out-of-band rejection for the 1710-2700MHz frequency band is expected to be above 40dB. It can be seen that the transition band between these two frequency bands is very narrow, relatively The bandwidth is only 6.6%, but the insertion loss is small and the out-of-band rejection is very high

To achieve these indicators, no matter it is theoretical or actual measurement, none of the aforementioned patents can meet this requirement

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