CNT-Infused EMI Shielding Composite for Lightweight Protection
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Solution Overview
Problem
Conductive materials like copper and aluminum used for EMI shielding and lightning protection are heavy, while lighter composite materials with conductive fibers like carbon have poor EMI shielding and lightning protection characteristics due to insulating matrices, leading to a need for alternative composites that are both effective and lightweight.
Innovation Solution
A composite material infused with carbon nanotubes (CNTs) in a matrix, where CNTs are oriented to maximize electromagnetic absorption and reflection, providing a broad range of EMI shielding effectiveness from 40 dB to 130 dB across various frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If highly conductive metals such as copper and aluminum are used for EMI shielding and lightning protection, then EMI shielding effectiveness and lightning protection characteristics are improved, but weight increases
Solution Approach 1:
The patent uses carbon nanotube-infused fiber materials combined with matrix materials to create composite structures that provide both EMI shielding effectiveness and lightning protection while maintaining reduced weight. The carbon nanotubes form conductive networks within the composite that enable electromagnetic interference shielding and lightning current dissipation without requiring heavy metal materials.
2Weight of moving object
If lighter composite materials with conductive fibers such as carbon are used, then weight is reduced, but EMI shielding and lightning protection characteristics deteriorate due to insulating matrices
Solution Approach 1:
The patent modifies the electrical conductivity parameter of the composite material by infusing carbon nanotubes into the fiber material. This creates conductive pathways through the typically insulating matrix material, transforming the composite from electrically insulating to electrically conductive, thereby enabling EMI shielding and lightning protection functionality while maintaining the weight advantages of composite materials.
3Reliability
If metal fillers, metal coating, or metal meshes are incorporated in composites to improve EMI shielding, then EMI shielding characteristics are improved, but device complexity and weight increase
Solution Approach 1:
The patent merges the structural fiber material with EMI shielding functionality by infusing carbon nanotubes directly into the fiber material during manufacturing. This integration eliminates the need for separate metal fillers, coatings, or meshes, combining the mechanical structural function and electromagnetic shielding function into a single unified material system, thereby reducing overall device complexity.
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 CNT-infused composite effectively absorbs and reflects electromagnetic radiation, offering improved EMI shielding and lightning protection with reduced weight and complexity, suitable for applications requiring high performance in these areas.
Implementation Method 1
The CNT-infused composite effectively absorbs and reflects electromagnetic radiation
Implementation Method 2
The CNT-infused composite effectively absorbs and reflects electromagnetic radiation
Data Source
AI summary
A composite for use in electromagnetic interference (EMI) shielding applications includes a carbon nanotube (CNT)-infused fiber material disposed in at least a portion of a matrix material. The composite is capable of absorbing or reflecting EM radiation, or combinations thereof in a frequency range from between about 0.01 MHz to about 18 GHz. The electromagnetic interference (EMI) shielding effectiveness (SE), is in a range from between about 40 decibels (dB) to about 130 dB. A method of manufacturing the composite includes disposing a CNT-infused fiber material in a portion of a matrix material with a controlled orientation of the CNT-infused fiber material within the matrix material, and curing the matrix material. A panel includes the composite and is adaptable to interface with a device for use in EMI shielding applications. The panel is further equipped with an electrical ground.