Segmented Electromagnetic Wave Absorber for Curved Surfaces
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Solution Overview
Problem
Existing electromagnetic wave absorbers face challenges in attaching to curved surfaces while maintaining effective electromagnetic wave absorption performance.
Innovation Solution
The electromagnetic wave absorber comprises a resistive layer, an electrically conductive layer with lower sheet resistance, and a dielectric layer, featuring slits that divide the layers into blocks with specific minimum dimensions, allowing for easier attachment to curved surfaces and enhanced absorption performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the electromagnetic wave absorber is designed with high flexural rigidity to maintain structural integrity, then the mechanical strength is improved, but the ease of attaching to curved surfaces deteriorates
Solution Approach 1:
The electromagnetic wave absorber is divided into multiple blocks by forming slits that extend from the front surface toward the back surface. This segmentation reduces the overall rigidity of the absorber, enabling it to be easily attached to curved surfaces while maintaining structural integrity through the distributed block structure.
2Ease of operation
If the electromagnetic wave absorber is divided into small blocks to enhance flexibility, then the ease of attaching to curved surfaces is improved, but the electromagnetic wave absorption performance deteriorates
Solution Approach 1:
The patent specifies that each block must have a minimum dimension of 2 mm or more in any direction. This local quality constraint ensures that each individual block maintains sufficient size to effectively absorb electromagnetic waves, while the overall segmented structure provides the necessary flexibility for attachment to curved surfaces.
3Reliability
If the sheet resistance of the electrically conductive layer is reduced to improve electromagnetic wave absorption, then the absorption performance is improved, but the material cost increases
Solution Approach 1:
By dividing the absorber into multiple blocks, the patent achieves enhanced electromagnetic wave absorption through the cumulative effect of multiple interfaces and reduced reflection. This allows the use of materials with higher sheet resistance (lower cost) while maintaining or improving overall absorption performance compared to a single continuous layer requiring very low sheet resistance.
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 enables easy attachment to articles with curved faces or complex shapes while achieving excellent electromagnetic wave absorption, with improved reflection and transmission loss characteristics.
Implementation Method 1
a dielectric layer having a thickness equivalent to λ/4 (λ is a wavelength of an electromagnetic wave to be absorbed)
Implementation Method 2
a resistive layer; an electrically conductive layer having a sheet resistance lower than a sheet resistance of the resistive layer
Data Source
AI summary
An electromagnetic wave absorber (1a) includes a resistive layer (10), an electrically conductive layer (20) and a dielectric layer (30). The electrically conductive layer (20) has a sheet resistance lower than a sheet resistance of the resistive layer (10). The dielectric layer (30) is disposed between the resistive layer (10) and the electrically conductive layer (20). The electromagnetic wave absorber (1a) has a first slit (15). The first slit (15) extends, in the resistive layer (10), from a first principal surface (10a) distal to the dielectric layer (30) toward the dielectric layer (30) in a direction perpendicular to the first principal surface (10a) and divides the resistive layer (10) into a plurality of first blocks (17). Each of the first blocks (17) has a minimum dimension (D1) of 2 mm or more at the first principal surface (10a).