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A method for testing the shielding effectiveness of fabric materials based on reverberation chamber conditions

A technology of shielding effectiveness and fabric materials, which is applied in the detection field of shielding effectiveness, can solve problems such as the inability to eliminate the influence of test window results, and achieve good electromagnetic shielding ability, good repeatability, and accurate test results

Active Publication Date: 2016-06-08
PEOPLES LIBERATION ARMY ORDNANCE ENG COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method cannot eliminate the influence of the test window on the results. One of the most significant problems is that when the test material is not loaded, the shielding effectiveness value obtained is not zero due to the aperture coupling effect of the test window.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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  • A method for testing the shielding effectiveness of fabric materials based on reverberation chamber conditions
  • A method for testing the shielding effectiveness of fabric materials based on reverberation chamber conditions
  • A method for testing the shielding effectiveness of fabric materials based on reverberation chamber conditions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The steps of embodiment 1 are as follows, as attached figure 1 shown:

[0025] Step 1: Construct a small mechanically stirred reverberation chamber using the tested fabric electromagnetic shielding material:

[0026] as attached figure 2 As shown, the fabric electromagnetic shielding material 3 to be tested is sewn into a rectangular cavity, one of which is provided with a zipper 4, the zipper 4 is opened, and a rectangular frame made of a non-conductor rod 2 is used to support it, and inside it Place a small stirrer, and then close the zipper 4 to form a small mechanical stirring reverberation chamber 1; the small stirrer is composed of a first step motor 6 and a first fan blade 7, and the first step motor 6 output drives the first step motor 6. A fan blade 7 rotates.

[0027] Step 2: Build a test platform:

[0028] Place the small mechanical stirring reverberation chamber 1 in the test area of ​​the large reverberation chamber 5 to form a nested reverberation cha...

Embodiment 2

[0034] The steps of embodiment 2 are as follows:

[0035] Step 1: Construct a small mechanically stirred reverberation chamber using the tested fabric electromagnetic shielding material:

[0036] Sew the tested fabric electromagnetic shielding material 3 into a conical cavity with zipper 4 on its side, open the zipper 4, hold it up with a conical frame made of non-conductor rod 2, and place a small Stirrer, and then close the zipper 4 to form a small mechanical stirring reverberation chamber 1; the small stirrer is composed of a first step motor 6 and a first fan blade 7, and the output of the first step motor 6 drives the first fan Leaf 7 turns.

[0037] Step 2: Build a test platform:

[0038] Place the small mechanical stirring reverberation chamber 1 in the test area of ​​the large reverberation chamber 5 to form a nested reverberation chamber; Step 3: Follow the appendix image 3 The structural principle block diagram of the test system shown is to set up the test syste...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Abstract

The invention discloses a method for testing the textile material shielding effectiveness based on a live room condition. The method comprises the steps that (1) a small-type mechanism stirring live room is made of a textile electromagnetic shielding material to be tested; (2) a nested live room is manufactured; (3) the frequency of a signal source is set, a large live room is radiated by electromagnetic waves through a transmitting antenna, and stirrers in the large live room and the small live room are started; (4) electric field average values Eout and Ein in a stirring period of the large live room and the small live room are measured; (5) the shielding effectiveness SE of the textile electromagnetic shielding material to be tested is calculated; (6) if it is judged that test frequency points in a required number are completed, a test is finished, and otherwise, the steps are repeated from the step (4). The method has the advantages that a test result is prevented from being affected by the hole and seam coupling effect of a test window, operation is simple and convenient, the method is more suitable for testing the capacity, for shielding the electromagnetic waves, of the textile electromagnetic shielding material to be tested which is stretched to different strengths and different shapes, the result is accurate, and the repeatability is good.

Description

technical field [0001] The invention relates to a method for testing the shielding effectiveness of fabric materials based on reverberation chamber conditions, which is especially suitable for detecting the shielding effectiveness of fabric materials in reverberation chambers. Background technique [0002] With the rapid development of electronic information technology, the electromagnetic environment is deteriorating day by day, and the ensuing electromagnetic interference problem is becoming more and more prominent. The electromagnetic shielding ability of such materials becomes particularly important. However, the traditional material shielding effectiveness testing method gradually exposed some deficiencies, and cannot comprehensively and objectively reflect its true electromagnetic shielding ability. For example, the shielded room method and the flange coaxial method stipulated in GJB6190-2008 in my country generally use a single plane wave to irradiate the tested mate...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00
Inventor 刘逸飞程二威陈永光王庆国赵敏曲兆明王研
Owner PEOPLES LIBERATION ARMY ORDNANCE ENG COLLEGE
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