EMI Cover Flap Sealing for Electrical Connector EMI Leakage
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Solution Overview
Problem
Conventional electrical connector assemblies, such as those following the QSFP and XFP standards, face issues with electromagnetic interference (EMI) emissions leaking into and out of the metal cages, which can interfere with pluggable modules and neighboring devices.
Innovation Solution
The implementation of an EMI cover with flaps and electrically conductive springs that engage with the divider and pluggable modules within the connector assembly, effectively reducing EMI emissions by providing a grounded connection and sealing the seams between the divider and the cage walls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal cage with dividers is used to house pluggable modules, then the modules can be organized and protected, but EMI emissions can leak through seams between the divider and cage walls
Solution Approach 1:
An EMI cover is introduced as an intermediary component between the divider and the cage walls. The cover includes flaps that wrap around the front edges of side walls and overlap with their exterior sides, creating an additional sealing layer that blocks EMI emissions from leaking through the seams between the divider and cage structure.
Solution Approach 2:
The EMI cover incorporates flexible conductive flaps that can wrap around and conform to the geometry of the cage structure. These thin, flexible conductive elements seal the seams between the divider and cage walls while maintaining electrical continuity for EMI shielding.
2Ease of manufacture
If the cage structure is simplified without EMI cover, then manufacturing and assembly are easier, but EMI emissions leak and interfere with pluggable modules
Solution Approach 1:
The EMI cover is designed as a separate, modular component that can be manufactured independently and then attached to the existing cage structure. This segmentation allows the cage itself to remain simple and easy to manufacture, while the EMI cover provides the necessary shielding functionality as an add-on element.
3Adaptability or versatility
If conventional QSFP/XFP modules are used without enhanced EMI shielding, then compatibility with existing standards is maintained, but data transmission rates above 10 Gbps are compromised due to EMI
Solution Approach 1:
The EMI cover is pre-installed on the cage structure before pluggable modules are inserted. This preliminary EMI shielding setup ensures that when high-speed modules operating above 10 Gbps are installed, they immediately benefit from the reduced EMI environment, enabling reliable operation at higher data rates without modifying the modules themselves.
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 solution significantly reduces EMI emissions, ensuring reliable data transmission rates up to 28 Gbps or higher by grounding the pluggable modules and sealing potential emission paths, thereby enhancing the performance and compatibility of electrical connector assemblies.
Implementation Method 1
The first and second sets of electrically conductive springs are configured to engage and electrically connect to the first and second pluggable modules, respectively
Implementation Method 2
the flap overlaps and engages the exterior side of the corresponding side wall
Data Source
AI summary
An electrical connector assembly includes a cage having an upper wall, a lower wall, and side walls that extend from the upper wall to the lower wall. The side walls have exterior sides. The cage includes an interior cavity and a divider that extends between the side walls and divides the interior cavity into at least two internal compartments. The cage includes a front end that is open to the internal compartments. The side walls have front edges at the front end. The internal compartments are configured to receive pluggable modules therein through the front end. An electromagnetic interference (EMI) cover is mounted to the divider such that the EMI cover is engaged with and electrically connected to the divider. The EMI cover includes a flap that wraps around the front edge of a corresponding side wall. The flap overlaps and engages the exterior side of the corresponding side wall.