Conductive Gasket Seals EMI Shielding Cage Gaps
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Solution Overview
Problem
Conventional shield assemblies for transceiver modules fail to effectively shield against external electromagnetic interference (EMI) and contain EMI emanating from the modules due to gaps between the metal cage, printed circuit board, and device components.
Innovation Solution
A shielding assembly comprising a cage, a shielding plate with resilient tabs, a supporting frame, and conductive gaskets that seal gaps between the cage, circuit board, and device components, ensuring comprehensive EMI shielding by grounding and mechanical connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If gaps are left between the cage, PCB, and device components for assembly ease, then ease of manufacture is improved, but electromagnetic shielding effectiveness deteriorates
Solution Approach 1:
A gasket is introduced as an intermediary component between the cage assembly and the device housing. The gasket fills the gaps and provides both mechanical sealing and electrical grounding, thereby maintaining electromagnetic shielding effectiveness while allowing assembly ease.
Solution Approach 2:
The gasket is made from a flexible, conductive material that can deform to fill irregular gaps between components. This flexible sealing structure ensures continuous electromagnetic shielding without compromising assembly ease, as the gasket adapts to the interface geometry.
2Object-affected harmful factors
If a metal cage is used for EMI shielding, then electromagnetic shielding effectiveness is improved, but device complexity increases due to multiple components and assembly steps
Solution Approach 1:
The gasket combines multiple functions into a single component: mechanical sealing to close gaps, electrical grounding to dissipate EMI, and structural support to stabilize the cage assembly. This merging reduces the number of separate components and simplifies assembly.
Solution Approach 2:
The gasket serves multiple purposes simultaneously: it acts as an EMI shield, a seal, and a grounding path. This multi-functionality reduces device complexity by eliminating the need for separate components for each function.
3Ease of operation
If gaps exist between the cage and module, then ease of module installation is improved, but electromagnetic shielding effectiveness deteriorates
Solution Approach 1:
The gasket acts as an intermediary that maintains continuous electromagnetic shielding between the cage and module even when gaps exist for installation purposes. The conductive gasket bridges the gap and prevents EMI leakage.
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 seals gaps to prevent external EMI from entering and internal EMI from escaping, providing robust electromagnetic interference shielding for transceiver modules.
Implementation Method 1
The cage functions to dissipate electrostatic buildup, and serves as an electromagnetic shield... thereby the cage does not effectively shield the module from external electromagnetic waves, and also does not effectively contain electromagnetic waves emanating from the module
Implementation Method 2
a plurality of tabs projecting from an inner surface of the main portion and configured for reducing electromagnetic interference
Implementation Method 3
The cage functions to dissipate electrostatic buildup... The gasket overlaps the shielding plate and the supporting frame
Data Source
AI summary
A shielding assembly includes a cage (40), a shielding plate (10), and a gasket (50). The cage includes a front end portion (41), a rear end portion (43) opposite to the front end portion, a plurality of clips (45) protruding from the front end portion, a pair of sidewalls (44), and a back wall (46). The shielding plate attached to the front end portion of the cage, includes a main portion (12), a plurality of resilient tabs (14) projecting from an inner surface of the main portion, and a plurality of through hatches (16) in the main portion for receiving the clips. The gasket is attached to the rear end portion and abuts against outer surfaces (49) of the sidewalls and the back wall.