EMI Cage Liner for Pluggable Module Shielding
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Solution Overview
Problem
Existing communication systems face challenges in containing electromagnetic interference (EMI) in pluggable modules, which affects electrical performance and requires complex manufacturing and assembly, while EMI gaskets block airflow necessary for cooling.
Innovation Solution
A cage member with a cage sleeve and liner provides EMI shielding by enclosing the pluggable module with multiple pieces, forming an electrical path and airflow channels to manage EMI effectively without obstructing airflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If EMI gaskets with metal beams or fingers are used to block EMI radiation at the port opening, then EMI containment is improved, but airflow channel is blocked and cooling capability deteriorates
Solution Approach 1:
The patent transitions from a two-dimensional EMI gasket (flat plane at the opening) to a three-dimensional cage structure (cage sleeve extending along the opening with vertical walls). This dimensional change allows the EMI shielding to wrap around the port in multiple directions while leaving the central airflow channel open, simultaneously achieving EMI containment and airflow preservation
Solution Approach 2:
The cage liner is received within the chamber defined by the cage sleeve, creating a nested structure. The cage liner provides additional EMI shielding for the pluggable module while the cage sleeve provides the outer structural framework and airflow channels. This nested arrangement allows multiple EMI shielding layers without completely blocking the airflow path
2Object-affected harmful factors
If cage members are manufactured from many pieces to provide EMI shielding, then EMI containment is improved, but manufacturing complexity and assembly difficulty increase
Solution Approach 1:
The patent merges the cage sleeve, base, and cage liner into an integrated cage member assembly where the cage liner is received within the chamber of the cage sleeve and both are mounted to the circuit board as a unit. This reduces the number of separate components compared to traditional multi-piece EMI gasket assemblies while maintaining effective EMI containment through the combined structure
Solution Approach 2:
The cage member is segmented into functional portions (cage sleeve for outer shielding and airflow, cage liner for inner module shielding) that can be manufactured separately and then assembled together. This segmentation allows each part to be optimized for its specific function while reducing overall manufacturing complexity compared to creating a single complex piece
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 contains EMI, improves electrical performance, and maintains airflow for cooling, reducing manufacturing complexity and costs by using a limited number of components and attachment points.
Implementation Method 1
The cage liner provides an electrical path between the pluggable module and the cage sleeve
Implementation Method 2
The cage liner is electrically connected to the cage sleeve and is configured to surround a mating perimeter of the pluggable module forward of a mating end of the pluggable module configured to be mated with the communication connector
Data Source
AI summary
A connector assembly includes a cage member for EMI containment for a pluggable module having a cage sleeve defining a chamber, a base coupled to the cage sleeve, and a cage liner received in the chamber. The cage liner defines a module cavity configured to receive a pluggable module. The cage sleeve extends between a front end and a rear end and includes a plurality of cage walls defining the chamber and surrounding a communication connector at or near the rear end. The cage liner is electrically connected to the cage sleeve and surrounds a mating perimeter of the pluggable module. The cage liner extends a majority of a length of the pluggable module within the chamber to provide EMI shielding for the pluggable module. The cage liner provides an electrical path between the pluggable module and the cage sleeve.