Micro-Sized Metamaterial Absorber Coatings for Lightweight EM Shielding
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Solution Overview
Problem
Existing electromagnetic shields using metallic flakes for absorbing electromagnetic waves are ineffective due to their large size and weight, which makes them impractical for coatings and reduces their electromagnetic radiation absorption performance.
Innovation Solution
The development of micro-sized metamaterial absorbers (MMAs) with dimensions less than 200 μm in length and 8 μm in thickness, composed of a first metal or semiconductor material, a dielectric material, and a second metal material, which are deposited on a substrate with embossed unit cells to form a coating that can absorb electromagnetic radiation across various ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional metallic flake-based electromagnetic shields are used, then electromagnetic radiation absorption is provided, but the size and weight become large making them impractical for coatings
Solution Approach 1:
The patent applies parameter changes by reducing the size of metallic flakes to micro-scale dimensions (less than 200 micrometers in length and less than 8 micrometers in thickness) and transforming them into metamaterial absorbers with specific geometric structures. This size parameter change enables the material to absorb electromagnetic radiation effectively while being lightweight enough for coating applications.
Solution Approach 2:
The patent uses composite materials by creating metamaterial absorbers that combine metallic flakes with dielectric materials in specific configurations. These composite structures exhibit enhanced electromagnetic absorption properties compared to traditional metallic flakes alone, while maintaining reduced weight and size suitable for coatings.
2Reliability
If traditional metallic flake-based electromagnetic shields are used, then electromagnetic radiation absorption is provided, but the large size reduces effectiveness for coating applications
Solution Approach 1:
The patent transforms the size parameter of metallic flakes from millimeter-scale to micrometer-scale dimensions. Specifically, the metallic flakes are reduced to less than 200 micrometers in length and less than 8 micrometers in thickness, enabling them to function effectively as coating materials while maintaining electromagnetic absorption capability.
Solution Approach 2:
The patent segments the electromagnetic shield into numerous small metamaterial absorber units distributed within the coating matrix. This segmentation approach allows the shield to function as a thin coating layer rather than a bulky component, improving applicability to various substrates.
3Reliability
If micro-sized metamaterial absorbers are used, then electromagnetic radiation absorption performance is improved and weight is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent merges the manufacturing process of metallic flake production with the formation of metamaterial absorber structures. By using conventional metallurgical processes to create micro-scale metallic structures and then coating them with dielectric materials, the complex metamaterial structure is produced through integrated rather than separate manufacturing steps.
Solution Approach 2:
The patent replaces complex mechanical assembly processes with deposition and coating techniques. Instead of mechanically assembling metamaterial structures, the metallic flakes are formed first and then dielectric materials are deposited onto them using vapor deposition or similar coating processes, simplifying the overall manufacturing system.
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 micro-sized MMAs provide improved electromagnetic radiation absorption performance while being lighter and easier to apply, allowing for coatings with enhanced absorption capabilities compared to traditional metallic flake-based solutions.
Implementation Method 1
an absorptive electromagnetic shield can absorb an electromagnetic wave that impinges a surface of the electromagnetic shield, thereby dissipating and converting the electromagnetic wave to another kind of energy, such as thermal energy
Implementation Method 2
depositing, by a deposition system, a first metal or semiconductor material on the release material; depositing, by the deposition system, a dielectric material on the first metal or semiconductor material
Data Source
AI summary
In some implementations, a metamaterial absorber (MMA) is configured to absorb a particular range of electromagnetic radiation. The MMA includes a first metal or semiconductor material; a dielectric material disposed on the first metal or semiconductor material; and a second metal material disposed on the dielectric material. A length dimension associated with the MMA is less than or equal to 200 micrometers (μm), a width dimension associated with the MMA is less than or equal to 200 μm, and a thickness dimension associated with the MMA is less than or equal to 8 μm.