Adjustable filter

A filter and adjustment structure technology, applied in the field of communication, can solve the problem of the influence of the tuning screw on the product index, etc., and achieve the effects of large tuning range, low intermodulation reduction, and easy tuning.

Active Publication Date: 2014-11-26
ANHUI TATFOOK M&E TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The RF signal is transmitted on the surface of the object, so the uneven surface of the tuning screw will seriously affect the product indicators, such as third-order intermodulation, insertion loss, high power, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A tunable filter includes a cavity and a resonant rod arranged in the cavity. The resonant rod includes a movable part and a fixed part. The fixed part is fixed inside the cavity. The movable part is sleeved with the fixed part, and the movable part further includes The adjustment structure passes through the movable part and out of the cavity to adjust the height of the movable part relative to the fixed part.

[0033] In the tunable filter in the embodiment of the present invention, the fixed part of the resonant rod is a metal tube, which can be integrally formed with the filter cavity or assembled in the cavity. The movable part of the resonance rod is also a tube body, and the fixed part of the resonance rod is sleeved on the movable part of the resonance rod. The movable part of the resonance rod is provided with an adjusting structure, which passes through the movable part and out of the cavity, and adjusts the height of the movable part relative to the fixed part o...

Embodiment 2

[0044] A tunable filter in this embodiment, such as figure 2 As shown, it includes a cavity 201, a resonance rod arranged in the cavity, the resonance rod includes a movable part 203 and a fixed part 202, the fixed part 202 is fixed inside the cavity, the movable part 203 is sleeved with the fixed part 202, and the movable part 203 also includes an adjusting structure 204 that passes through the movable part 203 and out of the cavity to adjust the height of the movable part 203 relative to the fixed part 202.

[0045] The movable part 203 of the resonance rod in this embodiment also includes an inner tube 212 of the movable part and an outer tube of the movable part extending radially outward from the top of the inner tube and bending and extending along the axial direction of the inner tube. The inner tube 212 of the movable resonance rod is coaxial with the fixed part 202 and its outer diameter is smaller than the inner diameter of the fixed part 202. The outer tube 211 of the ...

Embodiment 3

[0057] A tunable filter in this embodiment, such as Image 6 As shown, it includes a cavity 401, a resonance rod arranged in the cavity, the resonance rod includes a movable part 403 and a fixed part 402, the fixed part 402 is fixed inside the cavity, the movable part 403 is sleeved with the fixed part 402, and the movable part 403 also includes an adjusting structure 404, which passes through the movable part 403 and out of the cavity to adjust the height of the movable part 403 relative to the fixed part 402.

[0058] The movable part 403 of the resonance rod in this embodiment also includes a movable part inner tube 412 and a movable part outer tube that extends radially outward from the top of the inner tube and is bent and extended in the axial direction of the inner tube. The inner tube 412 of the movable resonance rod is coaxial with the fixed part 402 and its outer diameter is smaller than the inner diameter of the fixed part 402. The outer tube 411 of the movable part is ...

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PUM

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Abstract

The invention discloses an adjustable filter, which comprises a cavity and a resonance rod arranged in the cavity, the resonance rod comprises a movable portion and a fixed portion, the fixed portion is fixed in the cavity, the movable portion is sleeved with the fixed portion, the movable portion further comprises an adjusting structure, the adjusting structure passes through the movable portion and penetrates the cavity to adjust height of the movable portion corresponding to the fixed portion. According to embodiments of the invention, the adjustable filter has wide adjustable range and easily meets radio frequency demand.

Description

Technical field [0001] The present invention relates to the field of communication, in particular to a tunable filter. Background technique [0002] As a frequency selection device, cavity filters are widely used in the communication field, especially in the radio frequency communication field. In the base station, the filter is used to select the communication signal, filter out the clutter or interference signal outside the frequency of the communication signal. [0003] Cavity filters need to be debugged to meet the requirements of various radio frequency indicators. In the prior art, a large number of adjusting screws are locked on the cover of the radio frequency device. The number of adjusting screws ranges from tens to hundreds of thousands. By adjusting the length of these adjusting screws to penetrate into the cavity, it can achieve The purpose of debugging RF signal indicators. The traditional filter structure is as figure 1 As shown, it includes a resonance rod 106, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01P1/207
Inventor 杨绍春
Owner ANHUI TATFOOK M&E TECH
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