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Cavity filter and manufacturing method thereof

A cavity filter and manufacturing method technology, applied in waveguide devices, electrical components, circuits, etc., can solve the problems of unsatisfactory signal isolation, too long signal lines, radio frequency signal interference, etc., and achieve good isolation effect, Avoid the effect of cutting too much material

Active Publication Date: 2013-08-14
ANHUI TATFOOK TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The smooth structure in the filter cavity and the centralization of signal lines are effective measures to reduce the attenuation of radio frequency signal space transmission and reduce the interference from signal lines respectively. In practical applications, sometimes it is necessary to connect signal lines between two small cavities At present, the methods adopted are: winding the wire at the signal port of the small cavity or winding the wire from the top surface of the isolation rib, but the problem with this winding method is that the signal wire is too long, which will interfere with the radio frequency signal; figure 1 As shown, therefore, there are also those skilled in the art who open a line groove 104 from top to bottom on the top surface of the isolation rib, which can ensure that the edges and corners of the opening are relatively smooth, and can also meet the requirements of shortening the length of the signal line and reducing the signal line. Interference, but this kind of top-down slot needs to cut off too much material during processing, resulting in a large opening, which is not ideal for signal isolation

Method used

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  • Cavity filter and manufacturing method thereof
  • Cavity filter and manufacturing method thereof
  • Cavity filter and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1. A cavity filter, such as figure 2 As shown, it includes a cavity 201 and an isolation rib 202. It is characterized in that an opening 204 with a closed top surface is opened on the side wall of the isolation rib, and the opening 204 runs through the isolation rib so that both sides of the isolation rib communicate. .

[0016] In this embodiment, there is an opening 204 with a closed top surface on the side wall of the isolation rib 202, which is used for the signal connection line in the filter to pass through. The signal connection line can be a tap line or a signal transmission line, and the top surface is closed. The opening can be an opening that is closed all around, or a notch that is closed on three sides that is conducted on the left or right; the opening is processed by a cutting tool along the longitudinal direction of the isolation rib. The cutting tool adopts the rotary cutting method to cut the isolation rib, so the cutting surface of the op...

Embodiment 2

[0019] Embodiment 2. Due to the problem that the cutting tool touches the side wall of the isolation rib and cannot obtain an opening that meets the requirements due to the use of a cutting tool to open the opening on the isolation rib, this example provides another cavity that can solve this problem filter, Figure 4 It is a schematic cross-sectional view of the filter. There is a recess 206 at the opening of the isolation rib 202, and the recess 206 is used to avoid the handle 205 of the cutting tool when cutting the opening with a cutting tool.

[0020] The isolation ribs on both sides of the above-mentioned concave portion 206 can be on the same plane, such as Figure 4 As shown, the opening on the isolation rib 202 of the cavity filter is an opening closed on all sides, and the side walls of the isolation rib on both sides of the recess 206 are on the same plane, that is, the plane determined by the side wall of the isolation rib. During the opening, the rotating shaft 2...

Embodiment 3

[0024] Embodiment 3. A method for manufacturing a filter cavity, including: determining the position of the opening on the side wall of the isolation rib; using a cutting tool to cut an opening with a closed top surface at the position determined on the side wall of the isolation rib.

[0025] When the position of the opening is determined on the side wall of the isolation rib, a recess for avoiding the shank of the cutting tool is processed on the isolation rib, and the size of the recess is referred to, combined with the size of the shank of the cutting tool and the cutting radius selection of the tool Cutting tool, and determine the specific location of the opening according to the selected cutting tool. The moving distance of the rotation axis of the cutting tool relative to the bottom surface of the concave portion and the cutting radius of the cutting tool directly determine the size of the opening.

[0026] At the position determined by the side wall of the isolation ri...

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Abstract

The invention discloses a cavity filter and a manufacturing method thereof, and in particular relates to the cavity filter of an opening at a side wall of an isolating bar. The cavity filter at least comprises a cavity body and the isolating bar, wherein the side wall of the isolating bar is provided with an opening with a closed top surface; and the opening penetrates through the isolating bar so as to connect two sides of the isolating bar. In the invention, the opening at the side wall of the isolating bar is the opening with a closed top surface. Relative to the prior art, the requirementof wiring can be met and the good signal isolation effect is reached as well as the signal interference is reduced.

Description

technical field [0001] The invention relates to a cavity filter, in particular to a cavity filter with an opening on the side wall of an isolation rib and a manufacturing method thereof. Background technique [0002] As a frequency selective device, cavity filters are widely used in the field of communication, especially in the field of radio frequency communication. In the base station, the filter is used to select the communication signal and filter out the clutter or interference signal outside the frequency of the communication signal. [0003] The structure of the cavity filter in the prior art is as follows figure 1 As shown, it includes a filter cavity 101 and isolation ribs 102 that isolate the filter cavity into multiple small cavities. The smooth structure in the filter cavity and the centralization of signal lines are effective measures to reduce the attenuation of radio frequency signal space transmission and reduce the interference from signal lines respective...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01P1/208H01P11/00
Inventor 孙尚传童恩东
Owner ANHUI TATFOOK TECH CO LTD