Noise Suppression Sheet Multilayer Structure High Frequency Shielding
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Solution Overview
Problem
Increasing operation speeds of digital circuits generate more electromagnetic noise, posing risks to electronic apparatus functionality and human health, necessitating improved noise suppression technologies.
Innovation Solution
A noise suppression sheet with a multilayer structure comprising non-magnetic metal layers, metal magnetic layers, and insulating layers, where metal magnetic layers are alternately laminated on the non-magnetic metal layer, utilizing FeNi, FeSiAl, FeNiMo, or FeNiCo alloys with high magnetic permeability and electrical resistivity, and insulating layers of specific thicknesses to enhance magnetic shielding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional single-layer or simple multilayer structures are used for noise suppression, then manufacturing is simpler, but magnetic shielding characteristics are insufficient at high frequencies
Solution Approach 1:
The patent employs a composite multilayer structure consisting of alternating ferromagnetic metal layers and non-magnetic metal layers. This composite structure combines the high permeability of ferromagnetic materials (for magnetic flux guidance) with the electrical resistance of non-magnetic materials (for eddy current suppression), achieving superior magnetic shielding characteristics across wide frequency bands including high frequencies where conventional single-layer structures fail.
Solution Approach 2:
The noise suppression sheet is segmented into multiple thin layers with specific thickness ranges (ferromagnetic layers: 0.03-0.5 μm, non-magnetic layers: 0.03-2 μm). This segmentation creates multiple interfaces that scatter and absorb electromagnetic noise while the thin layer configuration allows the sheet to maintain flexibility and conformability without compromising shielding performance.
2Reliability
If thicker metal layers are used to improve shielding effectiveness, then magnetic shielding characteristics improve, but the sheet becomes less flexible and harder to thin
Solution Approach 1:
The patent optimizes the thickness parameters of each layer to achieve the desired balance. By controlling ferromagnetic layer thickness at 0.03-0.5 μm and non-magnetic layer thickness at 0.03-2 μm, the total sheet thickness is minimized while maintaining effective magnetic shielding. The specific parameter ranges are determined to provide sufficient shielding performance with minimal thickness, enabling both high-frequency noise suppression and sheet flexibility.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution achieves excellent magnetic shielding characteristics, effectively absorbing and suppressing noise across a wide frequency band, allowing for thinning and flexibility while maintaining effective noise suppression, even at high frequencies.
Implementation Method 1
utilizing FeNi, FeSiAl, FeNiMo, or FeNiCo alloys with high magnetic permeability and electrical resistivity
Implementation Method 2
insulating layers of specific thicknesses to enhance magnetic shielding
Data Source
AI summary
A noise suppression sheet comprises a non-magnetic metal layer, a plurality of metal magnetic layers, and a plurality of insulating layers, and the metal magnetic layer and the insulating layer are alternately laminated on the non-magnetic metal layer. The noise suppression sheet can absorb and suppress noise generated from a circuit or the like in an electronic component by being mounted on the electronic component or the like. In the noise suppression sheet, noise is absorbed by each of the metal magnetic layers. Noise that is transmitted without being absorbed by the metal magnetic layer can be reflected by the non-magnetic metal layer and can be absorbed again by the metal magnetic layer, and hence the noise suppression sheet can suppress noise effectively.