Method for testing shielding effectiveness of electromagnetic shielding material

A shielding effectiveness, electromagnetic technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problem that it is not portable or referable, cannot be used to judge the shielding effectiveness of materials, and cannot infer the conductivity of materials from it. parameters, etc., to overcome the effect of not having portability

Inactive Publication Date: 2013-09-18
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] 1) The measurement results of shielding effectiveness will be affected by factors such as the size of the shielding room (box), the size of the window, and the resonance effect of the shielding room, so that the test results are not portable or referable between different configurations
[0008] 2) The obtained shielding effectiveness is actually the combined effect of the material and the shielding body, so it cannot be used to judge the shielding effectiveness of the material itself, nor can it be deduced from it to deduce the conductivity parameter of the material

Method used

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  • Method for testing shielding effectiveness of electromagnetic shielding material
  • Method for testing shielding effectiveness of electromagnetic shielding material
  • Method for testing shielding effectiveness of electromagnetic shielding material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Such as figure 1 As shown, the shielding room is a cube with a side length of 0.4m, and the test window is a square with a side length of 0.12m. The transmitting antenna, the center of the test window, and the receiving antenna are on the same horizontal line. room center.

[0032] Step 1: Select a reference sample with known electromagnetic parameters, different electromagnetic frequencies, and set the electromagnetic emission intensity of the electromagnetic emission device.

[0033] Select a reference sample with a conductivity of 100S / m, a side length of 0.15m×0.15m, and a thickness of 2mm. Set the appropriate output amplitude of the transmitting device, and evenly select 10 electromagnetic frequencies in the 100MHz-1GHz frequency band (avoid resonance frequency points).

[0034] Step 2: use the reference sample to block the test window, and measure the electric field intensity received by the electromagnetic receiving device corresponding to different electromagn...

Embodiment 2

[0043] On the basis of the above steps, the present invention can further estimate the electrical conductivity of the material to be tested. Such as figure 1 As shown, the shielding room is a cube with a side length of 0.4m, and the test window is a square with a side length of 0.12m. The transmitting antenna, the center of the test window, and the receiving antenna are on the same horizontal line. room center.

[0044] Step 1: Select a reference sample with known electromagnetic parameters, different electromagnetic frequencies, and set the electromagnetic emission intensity of the electromagnetic emission device.

[0045] Select a reference sample with a conductivity of 10S / m, a side length of 0.15m×0.15m, and a thickness of 2mm, set the appropriate output amplitude of the transmitting device, and uniformly select 10 frequency points in the 100MHz-1GHz frequency band (avoid resonance frequency points) .

[0046] Step 2: Use the above-mentioned reference sample to block th...

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Abstract

The invention discloses a method for testing the shielding effectiveness of an electromagnetic shielding material in the technical field of electromagnetic shielding. The method comprises the following steps that a reference sample with known electromagnetic parameters and different electromagnetic frequencies are selected, and the electromagnetic transmission intensity of an electromagnetic transmitter is set; a testing window is sealed by the reference sample, and the electric field intensity received by electromagnetic receivers which correspond to different electromagnetic frequencies is measured; the testing window is tested by a material to be tested, and the electric field intensity received by the electromagnetic receivers which correspond to different electromagnetic frequencies is measured; and the shielding effectiveness of materials to be tested corresponding to different frequencies relative to the reference sample is calculated and the conductivity of the materials to be tested is estimated. The testing method is not affected by the size of a shielding room (box), the size of the window, the resonance of the shielding room and other factors, and overcomes the defect that the testing results of a traditional shielding room method are not portable among different configuration.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic shielding, in particular to a method for testing the shielding effectiveness of electromagnetic shielding materials. Background technique [0002] Electromagnetic shielding is one of the main technical measures to suppress electromagnetic interference and has a wide range of applications. The electromagnetic shielding ability of a material (excluding low frequency magnetic fields) is positively related to its electrical conductivity. Therefore, various metal materials are often the first choice for electromagnetic shielding. However, non-metallic composite conductive materials, such as conductive rubber, conductive fabric, conductive paint and conductive foam, etc., although the conductivity is relatively poor (conductivity ranges from tens to thousands of S / m, Siemens / meter), but Due to its adjustable mechanical properties and physical properties, the comprehensive application effect is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00
Inventor 焦重庆牛帅李琳
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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