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
CN103308798AInactive Publication Date: 2013-09-18NORTH CHINA ELECTRIC POWER UNIV (BAODING) +1
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
Publication Date
2013-09-18
Estimated Expiration
Not applicable Β· inactive patent

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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.
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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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