Conductive Foam EMI Shielding for Irregular PCB Surfaces
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Solution Overview
Problem
Traditional metal-based board level shielding assemblies are inflexible and cannot be applied to non-flat or irregular surfaces, leading to electromagnetic interference (EMI) leakage and limitations in wearable and flexible PCB applications.
Innovation Solution
The use of electrically-conductive foam frames and covers that can be die-cut or bent into various shapes, providing a flexible and joint-free solution for EMI shielding on uneven surfaces, with the foam offering Z-axis conductivity and being halogen-free for compliance with environmental standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional metal-based shielding assemblies are used, then EMI shielding effectiveness is achieved, but flexibility and adaptability to non-flat surfaces are lost
Solution Approach 1:
The patent replaces rigid metal shielding assemblies with flexible foam-based shielding structures that can conform to non-flat and irregular surfaces. The foam material allows the shielding to adapt to complex geometries while maintaining EMI shielding effectiveness, resolving the contradiction between shielding performance and flexibility.
Solution Approach 2:
The patent uses composite foam materials that combine the shielding properties of metal with the flexibility of foam. This composite approach maintains the EMI shielding effectiveness of traditional metal shields while gaining the flexibility and conformability of foam materials.
2Reliability
If traditional metal-based shielding assemblies are used, then EMI shielding is provided, but EMI leakage occurs on irregular surfaces
Solution Approach 1:
The flexible foam shielding structure conforms to irregular surfaces, eliminating gaps and voids that cause EMI leakage. The ability to mold to the surface geometry ensures continuous shielding coverage without the leakage problems associated with rigid metal assemblies on non-flat surfaces.
3Adaptability or versatility
If electrically-conductive foam is used, then flexibility and conformability to non-flat surfaces are achieved, but structural strength may be reduced
Solution Approach 1:
The foam material is engineered as a composite structure that maintains adequate structural strength while providing flexibility. The conductive foam combines the mechanical properties of foam with electrical conductivity, achieving a balance between strength and conformability.
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 solution effectively reduces EMI leakage and allows for flexible application on non-flat surfaces, enhancing shielding effectiveness while meeting environmental compliance, suitable for a wide range of electronic devices including smartphones and medical equipment.
Implementation Method 1
electrically-conductive foam frames and covers... offering Z-axis conductivity
Implementation Method 2
shields capable of absorbing and/or reflecting and/or redirecting EMI energy
Data Source
AI summary
According to various aspects, exemplary embodiments are disclosed of shielding apparatus or assemblies including electrically-conductive foam frames and covers or lids attachable to the frames. Also disclosed are exemplary embodiments of electrically-conductive foam frames for shielding apparatus or assemblies. Further, exemplary embodiments are disclosed of methods relating to making shielding apparatus or assemblies including electrically-conductive foam frames. Additionally, exemplary embodiments are disclosed of methods relating to providing shielding for one or more components on a substrate.