Multilayer EM Shielding Material for Electric and Magnetic Waves
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Solution Overview
Problem
Existing electromagnetic wave shielding materials struggle to provide high shielding performance against both electric and magnetic field waves due to the challenges of achieving both high reflection and attenuation simultaneously.
Innovation Solution
A multilayer structure comprising two metal layers with a high magnetic permeability insulating layer in between, where the magnetic permeability is 30 or more at 100 kHz, and includes flat-shaped metal particles with controlled alignment and a resin binder, optimizing the reflection and attenuation properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single metal layer is used for electromagnetic wave shielding, then the structure is simple and manufacturing is easy, but the shielding performance against both electric and magnetic field waves is insufficient
Solution Approach 1:
The shielding material is divided into multiple functional layers: a first metal layer for electric field shielding, a magnetic particle layer for magnetic field shielding, and a second metal layer for additional electric field shielding. This segmentation allows each layer to specialize in shielding against specific types of electromagnetic waves, achieving comprehensive shielding performance that a single layer cannot provide.
Solution Approach 2:
The invention uses a composite structure combining different materials with complementary properties: conductive metal layers (such as aluminum or copper) for electric field reflection and attenuation, and magnetic particles (such as ferrite or iron oxide) for magnetic field attenuation. This composite material approach enables simultaneous shielding against both electric and magnetic field waves through the synergistic effects of the different materials.
2Reliability
If magnetic particles are added to enhance magnetic field shielding, then shielding performance improves, but the material weight increases
Solution Approach 1:
Magnetic particles are concentrated specifically in the magnetic particle layer where they are needed for magnetic field shielding, rather than distributing magnetic material throughout the entire shielding structure. This localized placement achieves effective magnetic field attenuation while minimizing the overall weight of the shielding material.
Solution Approach 2:
The invention optimizes parameters such as magnetic particle concentration, particle size distribution, and layer thickness to achieve the required shielding performance with minimal weight. By carefully controlling these parameters, the design achieves effective magnetic field shielding while keeping the material weight as low as possible.
3Reliability
If metal layer thickness is increased to improve shielding, then shielding performance increases, but the overall thickness and device size increase
Solution Approach 1:
The shielding function is segmented across multiple thin layers rather than using a single thick layer. The first metal layer, magnetic particle layer, and second metal layer each contribute to the overall shielding performance, allowing the achievement of high shielding effectiveness with a smaller total thickness compared to a single thick metal layer.
Solution Approach 2:
The composite structure combines materials with different shielding mechanisms: metal layers that reflect and attenuate electric fields, and magnetic particles that attenuate magnetic fields. This composite approach achieves comprehensive shielding performance in a thinner overall structure than would be required using a single material type.
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 multilayer structure achieves high shielding performance against both electric and magnetic field waves by enhancing reflection and attenuation, maintaining structural integrity during bending, and reducing material weight.
Implementation Method 1
An electromagnetic wave shielding material (hereinafter, also described as a 'shielding material') is capable of exhibiting a function of shielding electromagnetic waves (shielding performance) by reflecting electromagnetic waves incident on the shielding material by the shielding material
Implementation Method 2
a high magnetic permeability layer that is an insulating layer in which a real part of a complex specific magnetic permeability at a frequency of 100 kHz is 30 or more
Implementation Method 3
by attenuating the electromagnetic waves in the inside the shielding material
Data Source
AI summary
There are provided an electromagnetic wave shielding material including a multilayer structure having, between two metal layers, a high magnetic permeability layer that is an insulating layer in which a real part of a complex specific magnetic permeability at a frequency of 100 kHz is 30 or more, and an electronic component and an electronic apparatus which include the electromagnetic wave shielding material.