Conformal EMI Shield for Electronic Modules
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Solution Overview
Problem
As electronic modules miniaturize, creating effective electromagnetic shields that do not increase module size becomes challenging, while existing shields are often costly and inefficient in reducing electromagnetic interference (EMI) to comply with regulatory standards.
Innovation Solution
A surface finish electromagnetic shield is applied to electronic modules using a groundable ring of conductive material, either through an electroless and electrolytic plating process forming a conductive layer or by spraying conductive epoxy paint, ensuring the shield is grounded and effective without increasing the module's size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a traditional electromagnetic shield is used to reduce EMI, then electromagnetic interference is reduced, but the module size increases
Solution Approach 1:
The electromagnetic shield is nested within the existing module structure by applying a conformal coating that integrates with the module's surface. The shield becomes part of the module's packaging rather than an external addition, effectively nesting the shielding function within the module's existing volume.
Solution Approach 2:
The patent uses a thin conformal coating applied as a flexible film over the module surface. This thin film provides electromagnetic shielding while adding minimal thickness to the module, avoiding the bulk associated with traditional rigid shield structures.
2Object-affected harmful factors
If a conformal shield coating is applied to reduce EMI, then electromagnetic interference is reduced, but manufacturing complexity increases
Solution Approach 1:
The shielding function is merged with the existing conformal coating process used in module manufacturing. By integrating EMI shielding into the standard encapsulation workflow, the patent avoids adding separate manufacturing steps, thereby reducing overall process complexity despite the added functional requirement.
Solution Approach 2:
The conformal coating serves multiple functions simultaneously: it provides environmental protection, mechanical encapsulation, and electromagnetic shielding. This multi-functionality eliminates the need for separate shielding layers, simplifying the manufacturing process compared to traditional multi-layer approaches.
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 electromagnetic interference by forming a conductive layer around the module, either through plated materials like copper and nickel or conductive epoxy, ensuring compliance with regulatory standards without adding to the module's size or increasing manufacturing costs.
Implementation Method 1
an electroless plating process forms a seed layer of conductive material, such as copper (Cu), over the module
Implementation Method 2
The seed layer then carries current for an electrolytic plating process, which deposits a second conductive layer on the seed layer
Implementation Method 3
When electromagnetic emissions from the module strike the interior surface of the conductive material, the electromagnetic emissions are electrically shorted through the grounded conductive material, thereby reducing emissions
Data Source
AI summary
An electromagnetic shield for an electronic module includes a surface finish that is applied to the surface of an electronic module so as to minimize the size of the shield. Once the shield is in place, the shield acts to address electromagnetic interference (EMI) concerns associated with the electronic module. An electronic module having a ring of conductive material embedded about its peripheral edge is formed. The electronic module is then sub-diced so as to expose the ring of conductive material. After sub-dicing, a conductive material may be applied through an electroless plating process followed by an electrolytic plating process. Alternatively, a conductive epoxy may be sprayed or painted onto the surface of the electronic module.