Fibrous Carbon Nanostructure Absorber for 20 GHz Waves
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Solution Overview
Problem
Existing electromagnetic wave absorption materials fail to effectively absorb high-frequency electromagnetic waves, as they are designed for lower frequency domains and lack specific absorption capacity for frequencies above 20 GHz.
Innovation Solution
A composite material comprising fibrous carbon nanostructures and an insulating material, where the fibrous carbon nanostructures are within a specific content range (5-15 parts by mass relative to 100 parts of insulating material) and exhibit a convex upward shape in a t-plot, enhancing absorption capacity for frequencies above 20 GHz.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional composite materials blending conductive materials with insulating materials are used, then electromagnetic wave absorption is achieved in lower frequency domains, but absorption capacity for high frequency domains (above 20 GHz) is insufficient
Solution Approach 1:
The patent changes the physical and chemical parameters of the conductive material by using fibrous carbon nanostructures with specific surface area (500-2500 m²/g) and controlled content (5-15 parts by mass), which fundamentally alters the electromagnetic wave interaction characteristics to enable high-frequency absorption above 20 GHz
Solution Approach 2:
The patent creates a composite material system combining fibrous carbon nanostructures with insulating materials (resin, rubber, or elastomer), where the synergistic interaction between the conductive nanostructures and insulating matrix enables effective electromagnetic wave absorption in high-frequency domains while maintaining processability
2Reliability
If the content of fibrous carbon nanostructures is increased to enhance absorption capacity, then high frequency absorption improves, but the material composition becomes unbalanced and may affect other properties
Solution Approach 1:
The patent optimizes the content parameter of fibrous carbon nanostructures to a specific range (5-15 parts by mass relative to 100 parts by mass of insulating material), which balances the absorption capacity enhancement with compositional stability and prevents excessive conductive material that would compromise material integrity
Solution Approach 2:
The patent utilizes the high specific surface area (500-2500 m²/g) of the fibrous carbon nanostructures to achieve effective absorption with minimal content, allowing the bulk material composition to remain stable while the surface/nano-scale regions provide the necessary electromagnetic wave interaction
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 material significantly improves electromagnetic wave absorption capacity in high-frequency domains above 20 GHz, providing effective absorption and durability for applications in next-generation wireless LANs and automotive radar systems.
Implementation Method 1
the electromagnetic wave absorption material and an electromagnetic wave absorber which contains the fibrous carbon nanostructures... the electromagnetic wave absorption capacity of the resultant electromagnetic wave absorption material in a high frequency domain of more than 20 GHz can be enhanced sufficiently
Data Source
AI summary
An electromagnetic wave absorption material comprises: fibrous carbon nanostructures; and an insulating material, wherein a content C of the fibrous carbon nanostructures when a content of the insulating material is 100 parts by mass is 5 parts by mass or more and 15 parts by mass or less, or, in the case where the fibrous carbon nanostructures are fibrous carbon nanostructures that exhibit a convex upward shape in a t-plot obtained from an adsorption isotherm, the content C is 0.3 parts by mass or more and 0.8 parts by mass or less, and the electromagnetic wave absorption material absorbs an electromagnetic wave in a frequency domain of more than 20 GHz.