Conformal EMI Shielding for PCB Components
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for attenuating electromagnetic interference (EMI) in electrical devices are laborious and expensive, requiring metal containers that occupy more space than necessary and are difficult to open for troubleshooting or reworking.
Innovation Solution
An EMI shielding method involving an electrical insulator coating on electronic components, contacting the printed circuit board and a conductive layer covering the insulator and ground connections, which can be conformal or non-conformal, to block EMI while minimizing device size and complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a metal container (can) is used to shield electronic components from EMI, then EMI attenuation is achieved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent replaces rigid metal containers with thin conductive foil layers that conform to the component shape. The foil is applied as a flexible thin film that provides EMI shielding without requiring complex metal forming, stamping, or soldering operations. This resolves the contradiction by maintaining EMI attenuation while dramatically simplifying manufacturing.
Solution Approach 2:
The patent replaces mechanical metal container assembly (stamping, bending, soldering) with a deposition process where conductive material is applied as a coating or foil layer. This substitution eliminates complex mechanical manufacturing steps while achieving the same EMI shielding function.
2Object-affected harmful factors
If a metal container (can) is used to shield electronic components from EMI, then EMI attenuation is achieved, but device size increases
Solution Approach 1:
The thin conductive foil layers provide EMI shielding with minimal thickness compared to traditional metal cans. The foil conforms to the component surface without requiring additional clearance space, thereby reducing the overall device volume while maintaining shielding effectiveness.
Solution Approach 2:
The patent transitions from three-dimensional metal container structures to two-dimensional conformal foil layers that wrap around components. This dimensional change allows the shielding to be applied as a surface coating rather than a volumetric enclosure, reducing device size.
3Object-affected harmful factors
If a metal container (can) is used to shield electronic components from EMI, then EMI attenuation is achieved, but ease of repair deteriorates
Solution Approach 1:
The shielding is applied as separate conformal layers on individual components rather than a single enclosed metal can. This segmentation allows components to be accessed and replaced independently by removing only the component-specific shielding layer, greatly improving repairability.
Solution Approach 2:
The patent replaces mechanical metal container assembly with conductive coating or foil that can be more easily removed or modified. This substitution eliminates the difficulty of opening soldered metal cans, allowing straightforward component access for troubleshooting and rework.
4Object-affected harmful factors
If traditional metal can shielding is used, then EMI attenuation is achieved, but manufacturing cost increases
Solution Approach 1:
The use of thin conductive foils and coating materials is significantly less expensive than forming and assembling metal containers. The simplified application process eliminates costly metal forming, stamping, and soldering operations, reducing manufacturing cost while maintaining EMI shielding performance.
Solution Approach 2:
The patent replaces complex mechanical metal container manufacturing with a simpler deposition or foil application process. This substitution eliminates multiple expensive manufacturing steps (stamping, bending, soldering) and replaces them with a more cost-effective coating or adhesive bonding process.
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
This approach reduces manufacturing costs and complexity, allows for smaller device designs, and prevents EMI interference between components, while being easier to implement and maintain.
Implementation Method 1
The conductive layer is configured to block electromagnetic interference (EMI) to or from the electronic components
Data Source
AI summary
An electrical device comprising an electronic component mounted to a surface of a printed circuit board, a ground connection on said surface, and electromagnetic interference (EMI) shielding. The EMI shielding includes an electrical insulator coating the electronic component, the insulator contacting the surface, and a conductive layer covering the electrical insulator, and contacting the electrical insulator and the ground connection.