Flexible Millimeter-Wave Absorbing Composition Without Reflective Layer
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Solution Overview
Problem
Existing electromagnetic-wave absorbing compositions and absorbers fail to effectively shield high-frequency electromagnetic waves in the millimeter-wave band and are not flexible enough to conform to non-flat surfaces or apply as a paste-like coating.
Innovation Solution
An electromagnetic-wave absorbing composition and absorber using a rubber binder, particulate carbon material, and magnetic iron oxide that magnetically resonates in the millimeter-wave band, allowing for flexible, nonresonant absorption and application as a paste or sheet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional electromagnetic-wave absorbers (block-shaped or planar) are used, then electromagnetic-wave absorption is achieved, but flexibility and ability to conform to non-flat surfaces are lost
Solution Approach 1:
The patent employs a rubber binder as the matrix material to create a flexible, sheet-shaped electromagnetic-wave absorber that can be easily deformed and conform to non-flat surfaces. This flexible matrix allows the absorber to be applied in various forms including sheets and paste-like coatings, resolving the contradiction between maintaining absorption functionality and achieving flexibility.
Solution Approach 2:
The invention creates a composite material system combining rubber binder, magnetic iron oxide particles, and carbon material particles. This composite structure integrates the flexibility of rubber with the electromagnetic-wave absorbing properties of magnetic particles and carbon materials, enabling both form adaptability and functional performance.
2Adaptability or versatility
If electromagnetic-wave absorbers are made rigid for structural stability, then manufacturing precision is improved, but adaptability to different application forms is reduced
Solution Approach 1:
The patent utilizes the viscoelastic properties of rubber that change with temperature and processing conditions. During manufacturing, the rubber can be softened for molding into desired shapes, then stabilized upon cooling or curing. This parameter change allows the material to be easily formed into various application forms while maintaining structural stability in the final product.
3Reliability
If magnetic iron oxide particles are used for high-frequency absorption, then electromagnetic-wave absorption in millimeter-wave band is achieved, but material cost and complexity increase
Solution Approach 1:
The patent combines magnetic iron oxide particles with carbon material particles in a rubber matrix to create a composite absorber. The carbon materials (such as carbon black or graphite) provide additional absorption mechanisms and can enhance the overall effectiveness while potentially reducing the required amount of expensive magnetic iron oxide, thus managing material complexity and cost.
Solution Approach 2:
The invention distributes different types of particles (magnetic iron oxide and carbon materials) throughout the rubber matrix, allowing each component to contribute its specific absorption properties locally. This local quality approach ensures comprehensive absorption coverage across the millimeter-wave band while optimizing the overall material composition.
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 composition and absorber efficiently convert high-frequency electromagnetic waves into heat, providing effective shielding with flexibility and elasticity, reducing the risk of short circuits while maintaining high electromagnetic-wave attenuation.
Implementation Method 1
magnetic iron oxide that magnetically resonates in a frequency band in or above a millimeter-wave band
Implementation Method 2
electromagnetic-wave absorbing composition and an electromagnetic-wave absorber that have properties of absorbing electromagnetic waves
Implementation Method 3
a filler made of a particulate carbon material
Data Source
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AI summary
Provided are an electromagnetic-wave absorbing composition that can favorably absorb electromagnetic waves of high frequencies in or above a millimeter-wave band and that can be applied to a desired portion in the form of a paste, and an easily deformable electromagnetic-wave absorber having flexibility. The electromagnetic-wave absorbing composition includes a rubber binder, a filler made of a particulate carbon material, and a magnetic iron oxide that magnetically resonates in a frequency band in or above a millimeter-wave band as an electromagnetic-wave absorbing material. The electromagnetic-wave absorber includes a rubber binder 1b, a filler 1c made of a particulate carbon material, and a magnetic iron oxide that magnetically resonates in a frequency band in or above a millimeter-wave band as an electromagnetic-wave absorbing material 1a, and is a nonresonant-type electromagnetic-wave absorber that is not provided with a reflective layer for reflecting incident electromagnetic waves.