Metal-Coated Plastic EMI Shield Structure Without Sheet Metal Warpage
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Solution Overview
Problem
Conventional EMI shielding structures for semiconductor devices, particularly in RF designs, are costly and unreliable due to warpage issues with traditional sheet metal shields.
Innovation Solution
Implementing a non-conductive frame with integrated laser-activated surface structures coated with metal, such as laser direct structuring (LDS) to create effective EMI shielding compartments, eliminating the need for traditional sheet metal shields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional sheet metal shields are used for EMI shielding, then shielding effectiveness is achieved, but warpage issues occur making the structure unreliable
Solution Approach 1:
The patent uses a composite structure combining non-conductive plastic frame material with metal shielding layers. The plastic frame provides structural stability and prevents warpage, while the metal layers (copper, nickel, gold) provide EMI shielding effectiveness. This composite approach resolves the contradiction by integrating the advantages of both materials.
Solution Approach 2:
The patent changes the material parameters from traditional sheet metal to laser-activated plastic with metal coating. The laser activation process creates a surface structure on the plastic that enables strong metal adhesion, fundamentally changing how the shielding structure is constructed and eliminating the warpage issues associated with traditional metal shields.
2Reliability
If traditional sheet metal shields are used for EMI shielding, then shielding effectiveness is achieved, but fabrication costs increase
Solution Approach 1:
The patent replaces the mechanical sheet metal shielding system with a laser-activated plastic framing system. The laser activation process (optical/thermal field) substitutes for traditional mechanical metal forming and assembly processes, reducing fabrication complexity and cost while maintaining shielding effectiveness.
Solution Approach 2:
The patent merges the framing structure and shielding function into a single integrated component. The plastic frame is laser-activated and metal-coated to provide both structural support and EMI shielding in one piece, eliminating the need for separate metal shield components and reducing overall fabrication costs.
3Ease of manufacture
If metal-coated plastic frames are used instead of sheet metal shields, then fabrication cost is reduced and warpage is eliminated, but manufacturing process complexity increases
Solution Approach 1:
The patent extracts the shielding function from separate metal components and integrates it directly into the plastic frame through laser activation and metal coating. This eliminates the need for separate shielding components and their associated assembly processes, reducing overall manufacturing complexity despite the advanced coating 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
Provides cost-effective and reliable EMI shielding by integrating metal-coated plastic frames that secure to the baseband card, ensuring consistent performance without warpage issues.
Implementation Method 1
a first laser-activated surface structure
Data Source
AI summary
Disclosed are apparatuses and techniques for fabricating apparatuses used as test platforms and commercial devices. In an aspect, an apparatus includes a non-conductive frame and a first shield structure. The first shield structure is part of the non-conductive frame. The first shield structure includes a first laser-activated surface structure, a first base metal disposed on the first laser-activated surface structure, and a first plating metal disposed on the first base metal.