Electromagnetic Wave-Absorbing Web for Low-Frequency Shielding
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Solution Overview
Problem
Existing electromagnetic wave-absorbing materials are ineffective at low frequency bands, heavy, and lack strength, leading to secondary noise and weight issues in electronic parts, particularly in vehicle applications.
Innovation Solution
A lightweight electromagnetic wave-absorbing web made from a mixture solution of conductive nanomaterials, magnetic nanofillers, binders, and solvents, manufactured as a nonwoven fabric using processes like melt blown, spun bond, or electro spun techniques, which absorbs electromagnetic waves by reflecting and converting them into heat, eliminating the need for additional reinforcing fibers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing electromagnetic wave-absorbing sheets with filling factor of 80% or more are used, then electromagnetic wave absorption at high frequency band is improved, but weight increases and applicability to low frequency band deteriorates
Solution Approach 1:
The patent changes the filling factor parameter from 80% or more in existing sheets to 10-60% in the new web structure, enabling effective electromagnetic wave absorption at low frequency bands while significantly reducing weight. This parameter change allows the material to be applicable to low frequency bands (below 1 GHz) where traditional high-density materials fail.
Solution Approach 2:
The patent uses a composite material structure combining polybutylene terephthalate (PBT) resin with glass fiber and ceramic fiber in a web configuration. This composite approach provides both the mechanical strength needed for structural applications and the electromagnetic wave absorption properties required for low frequency band shielding, eliminating the need for heavy metal shields.
2Reliability
If metal is used as shield material for electromagnetic waves, then electromagnetic wave reflection and shielding is improved, but weight increases and fuel ratio deteriorates
Solution Approach 1:
The patent replaces expensive, heavy metal shielding materials with a lighter, disposable-like composite web structure made of PBT resin, glass fiber, and ceramic fiber. This web provides effective electromagnetic wave absorption and shielding at low frequency bands without the weight penalty of metal, making it suitable for automotive applications where weight reduction improves fuel efficiency.
Solution Approach 2:
The patent changes the material composition from metal to a composite of PBT resin with glass and ceramic fibers, fundamentally altering the density and weight parameters while maintaining or improving electromagnetic wave shielding effectiveness through absorption rather than reflection mechanisms.
3Strength
If glass fiber is added to PBT resin to obtain withstand voltage and heat resistance, then material property is improved, but electromagnetic wave control characteristic deteriorates
Solution Approach 1:
The patent creates a tri-component composite system combining PBT resin, glass fiber, and ceramic fiber in specific proportions (glass fiber 1-10 parts, ceramic fiber 1-10 parts per 100 parts PBT resin). This composite formulation achieves a balance where glass fiber provides mechanical strength and electrical properties, ceramic fiber provides heat resistance and electromagnetic wave absorption, and PBT resin provides the matrix structure, collectively delivering both structural integrity and electromagnetic wave control characteristics.
Solution Approach 2:
The patent assigns different functional roles to different components: glass fiber primarily provides mechanical strength and electrical properties, ceramic fiber provides heat resistance and electromagnetic wave absorption capability, and PBT resin provides structural matrix. This local quality differentiation allows each component to excel at its specific function while contributing to overall performance.
4Reliability
If existing electromagnetic wave-absorbing material is used, then absorption capability is provided, but strength deteriorates, requiring added ceramic fiber or glass fiber
Solution Approach 1:
The patent merges the electromagnetic wave absorption function with the structural reinforcement function into a single integrated web structure. By combining PBT resin, glass fiber, and ceramic fiber in a web configuration with 10-60% filling factor, the material simultaneously provides electromagnetic wave absorption capability and mechanical strength, eliminating the need for separate reinforcement layers or additional ceramic/glass fiber additions.
Solution Approach 2:
The patent employs a composite material system where PBT resin provides the binding matrix, glass fiber provides tensile strength and structural integrity, and ceramic fiber provides both heat resistance and electromagnetic wave absorption. This composite structure achieves both strength and absorption capability intrinsically, without requiring additional reinforcing fibers.
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 web effectively shields electromagnetic waves at low frequency bands, enhancing durability and reducing weight, while maintaining strength without added fibers, thus preventing interference and secondary noise in electronic parts.
Implementation Method 1
absorbs electromagnetic waves by reflecting and converting them into heat
Implementation Method 2
The electromagnetic wave-absorbing web according to the present disclosure is made using electromagnetic wave-absorbing mixture solution
Implementation Method 3
converting them into heat
Implementation Method 4
electro spun web
Data Source
AI summary
An electromagnetic wave-absorbing web for controlling interference by electromagnetic wave at a low frequency band generated from various electric and electronic parts and for securing strength without added material and achieving lightweight is provided. The web is manufactured of a mixture solution in the form of a fabric having a mesh structure, wherein the mixture solution is made by mixing a conductive nanomaterial, a magnetic nanofiller, a binder, and a solvent.