Carbon Fiber Composite Case for Wireless Charging and EMI Shielding
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Solution Overview
Problem
Existing materials for wireless power supplying and receiving devices fail to simultaneously achieve electromagnetic wave transmission in a low frequency band for wireless charging and electromagnetic wave shielding in a high frequency band while maintaining mechanical properties and cost efficiency.
Innovation Solution
A carbon fiber-reinforced composite material with a specific magnetic shielding effectiveness ratio SEM300K/SEM1G of 0.50 or less, composed of stacked layers and combined with resin materials, designed to transmit in a low frequency band and shield in a high frequency band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If materials with no electromagnetic shielding performance are used for wireless power supplying/receiving device cases, then low frequency magnetic field transmission is achieved, but high frequency electromagnetic noise shielding is insufficient
Solution Approach 1:
The case is divided into multiple layers with different functional characteristics. The first case layer (outer layer) is made of material with electromagnetic shielding performance for high frequency noise, while the second case layer (inner layer) is made of material with low frequency magnetic field transmission capability. This segmentation allows each layer to perform its specialized function without interfering with the other.
Solution Approach 2:
The patent uses a composite structure combining different materials - specifically an aluminum plate (or other electromagnetic shielding material) as the first case layer, and a resin material with low frequency transmission properties as the second case layer. This composite material approach enables simultaneous achievement of high frequency shielding and low frequency transmission that cannot be obtained with single materials.
2Object-affected harmful factors
If multiple materials are combined to achieve both low frequency transmission and high frequency shielding, then electromagnetic wave control is improved, but manufacturing process complexity increases
Solution Approach 1:
The patent merges the electromagnetic shielding function and low frequency transmission function into a single integrated case structure. The first and second case layers are bonded together to form a unified housing that performs both functions simultaneously, eliminating the need for separate shielding components and reducing assembly steps.
Solution Approach 2:
The case structure is designed to perform multiple functions: the first case layer provides electromagnetic shielding for high frequency noise, the second case layer enables low frequency magnetic field transmission for wireless charging, and together they provide mechanical protection and structural support. This multi-functionality reduces the need for additional separate components.
3Object-affected harmful factors
If multiple materials are combined to achieve both low frequency transmission and high frequency shielding, then electromagnetic wave control is improved, but production cost increases
Solution Approach 1:
The patent employs cost-effective materials for each layer - using aluminum plate (a relatively inexpensive electromagnetic shielding material) for the first case layer and common resin materials for the second case layer. This approach achieves the required electromagnetic wave control without using expensive specialized materials, keeping production costs low.
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 material effectively transmits electromagnetic waves for wireless power supply/reception in a low frequency band while shielding high-frequency electromagnetic noise, maintaining mechanical properties and reducing costs.
Implementation Method 1
a ratio SEM300K/SEM1G of a value SEM300K (dB) at 300 kHz to a value SEM1G (dB) at 1 GHz of a magnetic shielding effectiveness measured by a KEC method and defined by Equation (1) is 0.50 or less
Implementation Method 2
it is important that the materials of a case for a wireless power supplying device and a case for a wireless power receiving device transmit a magnetic field in a frequency range used for wireless power supply/power reception
Data Source
AI summary
A carbon fiber-reinforced composite material is capable of transmitting an electromagnetic wave in a low frequency band while having an electromagnetic wave shielding performance in a high frequency band. The carbon fiber-reinforced composite material has a ratio SEM300K/SEM1G of a value SEM300K (dB) at 300 kHz to a value SEM1G (dB) at 1 GHz of a magnetic shielding effectiveness measured by a KEC method is 0.50 or less.