Composite Laminate Shielding with Interlaminar Resonance Chambers
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Solution Overview
Problem
Existing metal-based Faraday cage systems used for shielding electrical and electronic systems from electromagnetic radiation are heavy, limiting their use in airborne vehicle platforms and offering limited functionality due to material constraints.
Innovation Solution
A composite laminate material with interlaminar resonance chambers is developed, comprising a thermoplastic matrix with graphite and metal mesh layers, which provides superior electromagnetic shielding and structural robustness while being significantly lighter than traditional metal-based solutions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If metal-based Faraday cage systems are used for electromagnetic shielding, then electromagnetic shielding effectiveness is improved, but weight increases significantly
Solution Approach 1:
The patent employs a composite laminate structure consisting of alternating layers of dielectric material and conductive material (such as metal mesh or conductive polymer). This composite architecture provides electromagnetic shielding through multiple mechanisms including reflection at conductive interfaces, absorption within dielectric layers, and resonance effects from interlaminar cavities, while the lightweight nature of polymeric and composite materials significantly reduces overall weight compared to solid metal enclosures
Solution Approach 2:
The patent utilizes interlaminar resonance chambers formed between laminate layers that create controlled cavities and porous-like structures. These interlaminar spaces are tuned to specific resonant frequencies to enhance absorption of electromagnetic radiation at target frequencies. The resonance chambers allow the material to achieve superior shielding effectiveness at specific frequencies while maintaining low weight, as the cavities reduce material density without compromising shielding function
2Weight of moving object
If polymeric materials with conductive fillers are used for shielding, then weight is reduced, but electromagnetic shielding effectiveness and structural robustness decrease
Solution Approach 1:
The patent creates a multi-phase composite laminate combining dielectric polymer layers with embedded conductive layers (metal mesh, conductive polymer, or carbon-based materials). This composite structure synergistically combines the lightweight properties of polymers with the high conductivity of metal or conductive materials, achieving both weight reduction and maintained shielding effectiveness through the layered architecture that provides multiple shielding mechanisms
Solution Approach 2:
The patent transitions from two-dimensional planar shielding layers to three-dimensional interlaminar resonance chambers by creating spaced laminate structures with controlled thicknesses. The interlaminar cavities between conductive layers form resonant cavities that extend into the third dimension, enabling frequency-selective absorption and enhancing shielding effectiveness without increasing overall structure weight, as the cavities utilize air space rather than additional material
3Strength
If traditional metal enclosures are used, then structural robustness is provided, but weight increases and aerodynamic performance decreases
Solution Approach 1:
The patent employs composite laminate materials that combine the structural benefits of fiber-reinforced polymers with electromagnetic shielding functionality. The laminate structure, potentially incorporating carbon fiber or other high-strength fibers in the dielectric layers, provides mechanical strength and structural robustness comparable to metal enclosures, while the inherent lightweight nature of composite materials improves aerodynamic performance and reduces overall weight
Solution Approach 2:
The patent integrates multiple functions into a single laminate structure: the dielectric layers provide both structural matrix material and electromagnetic absorption/insulation, the conductive layers provide both structural reinforcement and electromagnetic reflection/shielding, and the interlaminar cavities provide both structural layering and resonant frequency tuning. This multi-functional integration eliminates the need for separate structural and shielding components, reducing overall weight while maintaining both structural robustness and shielding effectiveness
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 composite laminate material achieves electromagnetic shielding equivalent to or superior to metal-based systems while reducing weight, allowing for the integration of shielding and structural functions in a single, lightweight structure.
Implementation Method 1
at least a first portion of the electromagnetic radiation of the incident wave is absorbed by the metal mesh layers
Implementation Method 2
a second portion of the incoming wave is internally reflected within the resonance chambers
Implementation Method 3
The resulting structure possesses Faraday cage properties for the interior space of the receptacle
Data Source
AI summary
A receptacle that houses electrical and electronic components and shields the components from harmful electromagnetic radiation uses a series of interspersed graphite layers with metal mesh and/or metal-coated carbon fiber layers in overlapping tape format that are fused together to form a laminate. In addition to the electromagnetic radiation absorption occasioned by the metal mesh layers, resonance chambers are formed within the laminate between adjoining metal mesh layers. The resonance chambers are tuned such that waves of certain frequencies are reflected away from the internal chamber of the receptacle while other wave frequencies are resonated within the resonance chambers. This allows the components of the receptacle to be shielded from incoming belligerent waves while allowing the dispatch of useful outgoing waves.