Helical Graphene-Polymer EMI Shielding Structures for Flexible Protection
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Solution Overview
Problem
Existing EMI shielding technologies face challenges in providing flexible, lightweight, and cost-effective solutions that can effectively absorb and reflect electromagnetic radiation over a broad GHz range, offering 60-80 dB of EMI emission attenuation and conductivity of less than 0.3 Ω/sq, while avoiding the drawbacks of metallic materials.
Innovation Solution
The development of three-dimensional EMI shielding structures using a conductive composition comprising polymers and fully exfoliated single sheets of graphene, which are assembled into constructs like walls, curtains, and panels, utilizing a helical design with multilayered panels and encapsulating layers to enhance absorption and reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metallic materials are used for EMI shielding, then EMI attenuation performance is improved, but weight and cost increase
Solution Approach 1:
The patent changes the material composition parameters from traditional metals to a composite system consisting of polymers combined with fully exfoliated single sheets of graphene. This parameter change maintains EMI shielding effectiveness while dramatically reducing weight and cost, as the graphene-polymer composite achieves comparable electromagnetic interference attenuation without the density and expense of metallic materials.
Solution Approach 2:
The patent employs composite materials by combining polymer matrices with fully exfoliated single sheets of graphene to create a lightweight EMI shielding structure. This composite approach leverages the high conductivity and low density of graphene while utilizing the flexibility and processability of polymers, achieving effective EMI attenuation without the weight penalty of pure metallic shields.
2Reliability
If conventional EMI shielding materials are used, then EMI protection is achieved, but flexibility and structural integrity are compromised
Solution Approach 1:
The patent utilizes thin film structures of fully exfoliated single sheets of graphene dispersed in polymer matrices to create flexible EMI shielding materials. These thin film composites maintain structural integrity while providing the flexibility needed for modern electronic applications, overcoming the rigidity issue of traditional metallic shields.
Solution Approach 2:
The polymer-graphene composite material combines the flexibility and toughness of polymers with the conductive properties of graphene, achieving a balance between EMI protection and mechanical flexibility that conventional metallic materials cannot provide.
3Reliability
If EMI shielding structures are designed for broad GHz range attenuation, then EMI coverage is improved, but device complexity increases
Solution Approach 1:
The patent achieves broad GHz range EMI attenuation by optimizing the concentration and dispersion parameters of fully exfoliated single sheets of graphene within the polymer matrix. By controlling these material parameters, the structure provides wide-frequency shielding effectiveness without requiring complex multi-layer designs or additional components.
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 proposed solution provides efficient EMI shielding with minimal weight and cost, achieving 60-80 dB attenuation and conductivity, while maintaining flexibility and structural integrity, thus protecting electronic devices from electromagnetic interference.
Implementation Method 1
EMI occurs in the radio frequency spectrum when there is a disturbance generated by an external source that affects an electrical circuit by electromagnetic induction, electrostatic coupling, or conduction
Implementation Method 2
EMI occurs in the radio frequency spectrum when there is a disturbance generated by an external source that affects an electrical circuit by electromagnetic induction, electrostatic coupling, or conduction
Implementation Method 3
EMI occurs in the radio frequency spectrum when there is a disturbance generated by an external source that affects an electrical circuit by electromagnetic induction, electrostatic coupling, or conduction
Data Source
AI summary
Embodiments of the present invention relate to helical electromagnetic interference shielding (“HES”) structures. In one general aspect, the HES structure includes a folded state, unfolded state, and pair of rectangular EMI shielding panels. The EMI shielding panels form interconnected EMI shielding planes. Each rectangular EMI shielding panel includes a substrate and conductive layer. The conductive layer is positioned near the substrate and includes a conductive composition. The conductive composition includes graphene sheets dispersed in a polymer matrix as a 3D percolated network. The substrate is rectangular and includes a film and/or fabric. The EMI shielding planes are angularly offset from each other about their center axis and form a helical structure when in the unfolded state. Each EMI shielding plane rotates about the center axis when the HES structure transitions between the folded and unfolded states. Adjacent EMI shielding planes are an angular offset from each other.