Electromagnetic Wave Absorber with Flexible Dielectric Layer
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Solution Overview
Problem
Existing electromagnetic wave absorbers fail to effectively attach to non-flat surfaces and do not provide excellent absorption performance across a broad bandwidth, limiting their application in anti-collision systems that require millimeter-wave radar functionality.
Innovation Solution
An electromagnetic wave absorber comprising a dielectric or magnetic layer with a specific Young's modulus and thickness product of 0.1 to 1000 MPa·mm, and relative permittivity of 1 to 10, allowing easy attachment to non-flat surfaces and achieving excellent absorption performance across a broad bandwidth of 2 GHz or more within the 50 to 100 GHz frequency range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional electromagnetic wave absorber is used, then it can provide electromagnetic wave absorption, but it cannot be easily attached to non-flat surfaces
Solution Approach 1:
The patent applies parameter changes by controlling the product of Young's modulus and thickness within a specific range (0.1 to 1000 MPa·mm) and setting the relative permittivity between 1 to 10. This allows the absorber to achieve optimal flexibility for conforming to non-flat surfaces while maintaining effective electromagnetic wave absorption performance across broad bandwidths.
2Ease of manufacture
If a conventional electromagnetic wave absorber is used, then it can be produced at low cost, but it does not provide excellent absorption performance in a broad bandwidth
Solution Approach 1:
The patent achieves broad bandwidth absorption (2 GHz or more in the 50 to 100 GHz range) by optimizing the product of Young's modulus and thickness to be 0.1 to 1000 MPa·mm and the relative permittivity to be 1 to 10. These parameter ranges enable effective absorption across multiple frequency bands while maintaining compatibility with cost-effective manufacturing processes using conventional materials and techniques.
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 absorber can be easily attached to curved surfaces and exhibits electromagnetic wave absorption of 20 dB or more in the specified bandwidth, enhancing vehicle safety by reducing electromagnetic interference and eliminating the need for multiple absorber types for different frequency radars.
Implementation Method 1
a first layer that is a dielectric layer or a magnetic layer
Implementation Method 2
a first layer that is a dielectric layer or a magnetic layer
Implementation Method 3
an electrically conductive layer that is provided on at least one surface of the first layer
Data Source
AI summary
An electromagnetic wave absorber (1a) includes a first layer (10) and an electrically conductive layer (20). The first layer (10) is a dielectric layer or a magnetic layer. The electrically conductive layer (20) is provided on at least one surface of the first layer. A product of a Young's modulus of the first layer (10) and a thickness of the first layer (10) is 0.1 to 1000 MPa·mm. The first layer (10) has a relative permittivity of 1 to 10.