Laminated EM Shielding Material for Low-Frequency Attenuation
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Solution Overview
Problem
Existing electromagnetic wave shielding materials do not provide sufficient shielding performance in the low frequency range, particularly below 300 kHz, which is a critical concern for applications requiring high shielding effectiveness in this frequency range.
Innovation Solution
The development of an electromagnetic wave shielding material with a laminated structure comprising at least one ferromagnetic layer and at least one non-magnetic conductive metal layer, where the non-magnetic conductive metal layer is treated with a film containing an alloy of copper and nickel, and optionally cobalt, to enhance shielding properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conductive layer such as copper is used for electromagnetic wave shielding, then shielding properties in the higher frequency range (1 MHz or more) are improved, but shielding properties in the lower frequency range (1 MHz or less) deteriorate
Solution Approach 1:
The patent applies composite materials by combining ferromagnetic layers (with high magnetic permeability) and non-magnetic conductive metal layers (with high electrical conductivity) into a laminated structure. This composite construction enables the shielding material to effectively attenuate electromagnetic waves across both high and low frequency ranges by leveraging the complementary properties of each material layer.
Solution Approach 2:
The patent applies local quality by assigning different functional properties to different layers of the shielding material. The ferromagnetic layers provide magnetic permeability for low-frequency shielding, while the non-magnetic conductive metal layers provide electrical conductivity for high-frequency shielding. This localized functional differentiation resolves the contradiction between high and low frequency shielding performance.
2Reliability
If a laminated structure with ferromagnetic layers and non-magnetic conductive metal layers is used, then shielding properties in the low frequency range are improved, but weather resistance and adhesion may deteriorate
Solution Approach 1:
The patent applies composite materials by forming a treated film containing copper-nickel alloy on the non-magnetic conductive metal layer. This treated film serves multiple functions: it maintains the electrical conductivity needed for shielding while providing enhanced weather resistance and adhesion properties that prevent deterioration of the laminated structure in harsh environments.
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
This configuration achieves good shielding properties in the low frequency range, effectively attenuating electromagnetic waves by utilizing the ferromagnetic layers for absorption and the non-magnetic conductive metal layers for reflection, while also maintaining weather resistance and adhesion.
Implementation Method 1
electromagnetic wave shielding materials having alternating layers of magnetic and conductive layers with excellent magnetic permeability exhibit good shielding properties against magnetic waves
Implementation Method 2
conductive layers such as copper are known to exhibit good shielding properties against the electromagnetic waves
Data Source
AI summary
Provided is an electromagnetic wave shielding material having a good shielding property in a low frequency range. The electromagnetic wave shielding material has a structure in which at least one ferromagnetic layer and at least one non-magnetic conductive metal layer is laminated together, wherein the electromagnetic wave shielding material further includes a treated film containing an alloy including copper and nickel on at least one surface of the non-magnetic conductive metal layer.