Carbon Fiber Felt Metamaterial for Thin Wideband Wave Absorption
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Solution Overview
Problem
Existing electromagnetic wave-absorbing materials face challenges in achieving a wider absorption frequency band, smaller thickness, higher absorption efficiency, and preventing delamination and failure when integrated into resin matrix composites.
Innovation Solution
A resin matrix composite metamaterial is developed using a chopped carbon fiber felt with a centro-symmetric structure, comprising dielectric and reflection layers, and an array structure layer made of carbon fiber felt units, which are laminated and reinforced with fiber fabric to enhance stability and absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional FSS with patterned metal materials is used, then resonant frequencies can be precisely adjusted to control electromagnetic wave characteristics, but the structure becomes complex and production cost increases
Solution Approach 1:
The patent changes the material parameter from conventional metal to carbon fiber felt, which has different electromagnetic properties (electrical resistivity of 0.1-0.2 Ω·cm, electrical conductivity of 5-10 S/cm). This material substitution allows for simplified structure while maintaining frequency control capability through the inherent properties of carbon fiber felt
Solution Approach 2:
The patent replaces expensive patterned metal materials with carbon fiber felt, which is cheaper and easier to manufacture. The carbon fiber felt can be directly cut into square-ring patches without requiring complex patterning processes, reducing both structural complexity and production cost
2Measurement precision
If conventional FSS is embedded in composite, then electromagnetic wave characteristics can be controlled, but a weak interface is generated leading to delamination and composite failure
Solution Approach 1:
The patent uses carbon fiber felt for both the FSS structure and the reinforcement fabric, creating material homogeneity throughout the composite. This eliminates the interface between dissimilar materials (metal and polymer matrix) that causes delamination, as the carbon fiber felt integrates seamlessly with the resin matrix composite structure
Solution Approach 2:
The patent creates a composite material structure where carbon fiber felt serves dual purposes: as the FSS functional element and as reinforcement. The combination of carbon fiber felt with resin matrix creates a homogeneous composite that prevents interface delamination while maintaining electromagnetic wave control capabilities
3Loss of energy
If traditional wave-absorbing materials are used, then loss mechanism converts electromagnetic wave energy to thermal energy, but the materials cannot meet requirements for thickness, weight, and wave absorption bandwidth
Solution Approach 1:
The patent uses carbon fiber felt as a composite material that provides both electromagnetic wave absorption through loss mechanism and structural integrity. The carbon fiber felt's inherent conductivity and porosity enable effective energy conversion while maintaining thin profile and lightweight characteristics that traditional materials cannot achieve
Solution Approach 2:
The carbon fiber felt has a porous structure that increases surface area and enhances electromagnetic wave interaction. This porosity allows for improved energy absorption efficiency within a thinner profile, converting more electromagnetic energy to thermal energy per unit thickness compared to dense traditional materials
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 metamaterial achieves improved electromagnetic wave absorption performance with a wider frequency band and stability across various incidence angles, while preventing delamination and maintaining impact resistance.
Implementation Method 1
the chopped carbon fiber felt of the m×n carbon fiber felt structure units has an electrical resistivity of 0.1-0.2 Ω·cm, an electrical conductivity of 5-10 S/cm
Implementation Method 2
the first dielectric layer is made of a first fiber fabric-reinforced resin matrix composite; the second dielectric layer is made of a second fiber fabric-reinforced resin matrix composite
Data Source
AI summary
An impact-resistant and wave-absorbing resin matrix composite metamaterial based on a chopped carbon fiber felt and a preparation method thereof are provided. The composite metamaterial includes a first dielectric layer, an array structure layer, a second dielectric layer, and a reflection layer, and the first dielectric layer, the array structure layer, the second dielectric layer, and the reflection layer are laminated in sequence from top to bottom. The array structure layer has a centro-symmetric structure, and is composed of m×n carbon fiber felt structure units in a periodic arrangement. Each of the m×n carbon fiber felt structure units is a square-ring patch having an outerring width L1 of 23-26 mm, an inner-ring width L2 of 10-15 mm, and a periodic side length P of 30 mm.