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An electromagnetic interference shielding structure

A technology of electromagnetic interference shielding and magnetic permeability, which is applied in the fields of magnetic field/electric field shielding, electrical components, etc., can solve problems such as poor shielding effect, and achieve good shielding effect.

Active Publication Date: 2019-08-02
BOE TECH GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problem of poor shielding effect of the existing electromagnetic interference shielding structure, the present invention provides an electromagnetic interference shielding structure

Method used

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  • An electromagnetic interference shielding structure
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  • An electromagnetic interference shielding structure

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Embodiment 1

[0024] This embodiment provides an electromagnetic interference shielding structure, such as Figure 1-2 As shown, it includes a whole layer of first metal layer 3 and a patterned second metal layer 1, an insulating layer 2 is provided between the first metal layer 3 and the second metal layer 1, and the first metal layer 3 and the second metal layer 1 The two metal layers 1 are connected through the via holes in the insulating layer 2 .

[0025] When the electromagnetic interference shielding structure of this embodiment is used, the first metal layer 3 is used as the inner layer close to the component to be protected, the patterned second metal layer 1 is used as the outer layer away from the component to be protected, and the second metal layer 1 shields other radiation The source of electromagnetic, which can reflect the electromagnetic back; the first metal layer 3 of the whole layer will shield its own electromagnetic to prevent interference with other components; the fi...

Embodiment 2

[0027] This embodiment provides an electromagnetic interference shielding structure, such as Figure 3-4 As shown, it includes a whole layer of first metal layer 3 and a patterned second metal layer 1, an insulating layer 2 is provided between the first metal layer 3 and the second metal layer 1, and the first metal layer 3 and the second metal layer 1 The two metal layers 1 are connected through the via holes in the insulating layer 2 . Wherein, the magnetic resistance of the first metal layer 3 is smaller than the magnetic resistance of the second metal layer 1 ; the magnetic permeability of the first metal layer 3 is greater than the magnetic permeability of the second metal layer 1 .

[0028] That is, the reluctance formula is:

[0029]

[0030] Among them, L is the length of the metal, A is the cross-sectional area of ​​the metal, and μ is the magnetic permeability of the metal. The magnetic permeability of the first metal layer 3 of the entire layer is higher than t...

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Abstract

The invention provides an electromagnetic interference shielding structure, which belongs to the technical field of electromagnetic interference screens and can solve the problem of poor shielding effect of an existing electromagnetic interference screen. In the electromagnetic interference shielding structure, a second metal layer subjected to patterning and a first metal layer are connected through the through hole of an insulation layer between the second metal layer and the first metal layer. When the electromagnetic interference shielding structure is used, the first metal layer approaches to a component to be protected, the second metal layer subjected to patterning is far away from the component to be protected, so that the second metal layer subjected to patterning shields the electromagnetism of other radiation sources, and can reflect the electromagnetism back; and the whole first metal layer shields own electromagnetism to avoid disturbing other components. The electromagnetic interference shielding structure has a good shielding effect, is suitable for the electromagnetic protection of each field and is especially suitable for electromagnetic protection among a high-frequency signal line, the pins of an integrated circuit, various classes of plugins and the like in a printed circuit board.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic interference shielding, and in particular relates to an electromagnetic interference shielding structure. Background technique [0002] Electromagnetic Interference (EMI) is the interference caused by the work of electronic products to other surrounding electronic products. It refers to the interference phenomenon caused by the interaction between electromagnetic waves and electronic components. There are two types of conducted interference and radiated interference. Conducted interference refers to the coupling (interference) of a signal on one electrical network to another electrical network through a conductive medium. Radiation interference refers to the interference source coupling (interference) its signal to another electrical network through space. For example, in high-speed printed circuit board (Printed Circuit Board, PCB) and system design, high-frequency signal lines, integrat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05K9/00
CPCH05K9/0088
Inventor 刘颖李福腾王耀东刘楠王鑫张晓萍王涛
Owner BOE TECH GRP CO LTD