Screen performance test method for veneer with built-in electromagnetic layer
A technology of electromagnetic shielding layer and testing method, which is applied in the fields of electromagnetic field characteristics, measuring electricity, measuring devices, etc., can solve problems such as large contact resistance, and achieve the effect of overcoming excessive contact resistance.
Inactive Publication Date: 2010-10-13
INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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Problems solved by technology
[0017] The test method of the present invention makes the outer conductor and the inner conductor in the test device all realize good electrical connection with the electromagnetic shielding layer inside the sample by coating the conductive paint on the surface of both sides of the sample and the wall of the central hole, thereby overcoming It solves the problems caused by the excessive contact resistance between the test device and the sample in the existing method, and provides a technical guarantee for accurately testing the electromagnetic shielding effectiveness of the sample
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[0026] When implementing the testing method of the present invention, at first, make the sample that has the central hole for testing in the same way as the existing coaxial line testing method; Then, as Image 6 , 7 As shown, the conductive paint is coated on the outer peripheral surface of the sample and the wall of the central hole, and a ring-shaped conductive coating is coated on the edge of the surface on both sides of the sample with the conductive paint, and the ring-shaped conductive coating passes through The coated conductive paint on the outer circumference of the sample is electrically connected to the shielding layer inside the sample; finally, using figure 1 The existing coaxial cable test device shown in the test is used to test the shielding effectiveness of the sample.
[0027] Since the parts in contact with the outer conductor and the conductive column on the test device are coated with conductive paint, and the ring-shaped conductive coating and the condu...
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This invention disclose a kind of plywood shield efficiency coaxial test method, this test method bases on exist coaxial line test method, makes the electromagnetic shielding layer in the sample electric connects the external conductor and the inner conductor nicely by covering the conducted material in the sample surface, to overcome the problem produced by the over-big contact resistance between the test instrument and the sample in exist method, provides technology safeguard for the electromagnetic shielding effect of the test sample .
Description
technical field [0001] The invention relates to a coaxial test method for the shielding effectiveness of plywood, in particular to a coaxial test method for the shielding effectiveness of plywood in which an electromagnetic shielding layer is arranged inside and the upper and lower surfaces are insulated. Background technique [0002] With the development of electromagnetic compatibility technology, various new shielding materials have been developed, from the original pure metal materials to the current metal wire textiles, metal fiber filled plastics, coated plastics, coated glass and laminated composite materials Wait. The performance index of shielding materials is generally expressed by shielding effectiveness, which reflects the ability of shielding materials to shield electromagnetic waves. Shielding effectiveness is usually tested by measurement methods such as shielding room window method, spherical dipole antenna method, and coaxial line method, among which the co...
Claims
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IPC IPC(8): G01R31/00G01R29/08
Inventor 傅峰卢克阳刘贤淼陈志林
Owner INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY