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Adjustable filter

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

Active Publication Date: 2012-07-25
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] An adjustable filter, comprising a cavity, 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 and the fixed part are socketed, and the movable part also includes An adjustment structure, the adjustment structure passes through the movable part and out of the cavity, and adjusts the height of the movable part relative to the fixed part.

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

Embodiment 2

[0044] A tunable filter in this embodiment, such as figure 2 As shown, it includes a cavity 201 and a resonant rod disposed in the cavity. The resonant rod includes a movable part 203 and a fixed part 202. The fixed part 202 is fixed inside the cavity, and the movable part 203 and the fixed part 202 are socketed. 203 also includes an adjustment structure 204 , the adjustment structure 204 passes through the movable part 203 and out of the cavity, and adjusts the height of the movable part 203 relative to the fixed part 202 .

[0045] The movable part 203 of the resonant rod in this embodiment also includes the inner tube body 212 of the movable part and the outer tube of the movable part extending radially outward from the top of the inner tube body and extending along the axial direction of the inner tube body. body 211 , the inner tube body 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 fi...

Embodiment 3

[0057] A tunable filter in this embodiment, such as Image 6 As shown, it includes a cavity 401 and a resonant rod disposed in the cavity. The resonant 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 socketed with the fixed part 402. 403 also includes an adjustment structure 404 , the adjustment structure 404 passes through the movable part 403 and out of the cavity, and adjusts the height of the movable part 403 relative to the fixed part 402 .

[0058] The movable part 403 of the resonant rod in this embodiment also includes the inner tube body 412 of the movable part and the outer tube of the movable part extending radially outward from the top of the inner tube body and extending along the axial direction of the inner tube body. body 411 , the inner tube body 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 p...

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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 invention relates to the communication field, in particular to an adjustable filter. 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 cavity filter needs to be adjusted to meet the requirements of various radio frequency indicators. In the prior art, a large number of adjustment screws are locked on the cover plate of the radio frequency device. The number of adjustment screws ranges from dozens to hundreds or thousands. By adjusting the length of these adjustment screws deep into the cavity, the The purpose of debugging RF signal indicators. Traditional filter structures such as figure 1 As shown, it includes a resonant rod 10...

Claims

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Application Information

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