Flexible Electromagnetic Wave Absorbing Sheet for Millimeter Wave Applications
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Solution Overview
Problem
Conventional electromagnetic wave absorbing materials lack sufficient flexibility to effectively cover and protect electronic circuit components from high-frequency electromagnetic waves, especially in curved surfaces, as they tend to distort or crack during rearrangement.
Innovation Solution
An electromagnetic wave absorbing sheet with a magnetic iron oxide layer that magnetically resonates at high frequencies, combined with a resin binder, providing a flexibility evaluation value of more than 0 and 6 or less, allowing it to be bent without plastic deformation and easily attached to curved surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional electromagnetic wave absorbing materials are used to cover circuit components, then electromagnetic wave absorption is achieved, but flexibility is insufficient causing distortion or cracking during rearrangement
Solution Approach 1:
The patent employs a thin film structure with thickness of 10 μm to 100 μm that provides the necessary flexibility for conformal mounting on curved surfaces while maintaining electromagnetic wave absorption functionality. The thin film design allows the material to bend and rearrange without cracking, resolving the contradiction between flexibility and structural integrity
Solution Approach 2:
The patent uses a composite material system combining epsilon iron oxide particles (0.1 μm to 10 μm) with a binder matrix, creating a material that simultaneously achieves electromagnetic wave absorption at millimeter wave frequencies and mechanical flexibility. This composite structure enables both absorption performance and resistance to distortion during rearrangement
2Ease of operation
If the sheet is made thinner to improve flexibility, then flexibility increases, but electromagnetic wave absorption performance may deteriorate
Solution Approach 1:
The patent optimizes critical parameters including particle size (0.1 μm to 10 μm), film thickness (10 μm to 100 μm), and frequency band (millimeter wave range) to achieve simultaneous improvement in flexibility and absorption performance. By carefully controlling these parameters, the thin film maintains effective electromagnetic wave absorption while providing the flexibility needed for conformal mounting
3Area of stationary object
If the sheet needs to be rearranged to eliminate spaces, then coverage improves, but the sheet may be forcibly peeled off and distorted
Solution Approach 1:
The thin film design with thickness of 10 μm to 100 μm provides the flexibility necessary for the sheet to be peeled, rearranged, and conformally mounted on curved surfaces without distortion. This enables complete coverage of circuit components by eliminating spaces through proper positioning
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 sheet achieves high flexibility and effective electromagnetic wave absorption at frequencies above the millimeter wave band, maintaining performance while being self-supporting and adaptable to various shapes, preventing distortion and cracking.
Implementation Method 1
an electromagnetic wave absorbing layer containing a magnetic iron oxide that magnetically resonates at frequencies in and above a millimeter wave band
Data Source
AI summary
An electromagnetic wave absorbing sheet is provided that can adequately absorb electromagnetic waves at high frequencies in and above the millimeter wave band, can have excellent flexibility, and can easily be placed in any desired portion.The electromagnetic wave absorbing sheet includes an electromagnetic wave absorbing layer 1 containing a magnetic iron oxide 1a that magnetically resonates at frequencies in and above the millimeter wave band and a resin binder 1b. The electromagnetic wave absorbing sheet absorbs radiated electromagnetic waves by magnetic resonance of the magnetic iron oxide. The electromagnetic wave absorbing sheet has a flexibility evaluation value F (g/mm2) of more than 0 and 6 or less, which is determined by measuring an applied weight (g) that is required to bend a ribbon-like electromagnetic wave absorbing sheet in the elastic deformation region so that a distance d between the inner surfaces of the ribbon-like sheet at a position L spaced 10 mm from the bent portion of the ribbon-like sheet is 10 mm, and dividing the applied weight (g) by a cross-sectional area D (mm2) of the ribbon-like sheet.