Double-Layer Metal Shell for Electrical Connector EMI Shielding
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Solution Overview
Problem
Conventional electrical connectors for high-frequency signals lack effective EMI shielding and structural strength due to their single-layer metal shell configuration and loose assembly of components.
Innovation Solution
A double-layer metal structure is implemented with an inner metal shell surrounding the insulative housing and contact modules, and an outer metal shell contacting the inner shell, enhancing EMI shielding and structural integrity through a 360-degree main frame and spring fingers for secure assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-layer metal shell is used, then the device complexity is reduced, but the EMI shielding performance deteriorates
Solution Approach 1:
The metal shell is divided into two separate layers: an inner metal shell and an outer metal shell. This segmentation allows each layer to contribute to EMI shielding independently, creating a more effective shielding structure while maintaining manageable complexity through modular design
Solution Approach 2:
The inner metal shell is nested within the outer metal shell, forming a concentric double-layer structure. This nesting arrangement maximizes EMI shielding effectiveness by creating multiple barriers against electromagnetic interference, with the inner shell protecting critical components and the outer shell providing additional shielding
2Ease of operation
If components are assembled loosely, then the ease of assembly is improved, but the structural strength deteriorates
Solution Approach 1:
The inner metal shell and outer metal shell are combined through fixed connections at multiple positions, merging them into a unified structural assembly. This combination significantly enhances the overall structural strength while maintaining ease of assembly through predetermined connection points and standardized fastening methods
Data Source
AI summary
An electrical connector includes an insulative housing, at least one contact module, an inner metal shell, and a tubular outer metal shell. The insulative housing has a top wall, a bottom wall, a pair of side walls, and a receiving chamber. The contact module includes an insulator and a set of contacts retained in the insulator. Each contact has a contact portion protruding into the receiving chamber. The inner metal shell has a main frame surrounding the insulative housing by 360 degrees. The outer metal shell surrounds the inner metal shell and contacts with the inner metal shell.