Receptacle Cage EMI Shielding for Optical Modules
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Solution Overview
Problem
Existing optical communication systems face challenges in effectively suppressing electromagnetic interference (EMI) noise radiation from transceiver modules, particularly due to gaps between the optical module and the receptacle, which hinder efficient noise shielding.
Innovation Solution
The implementation of a receptacle cage and transceiver module assembly with multiple shield members, including a first shield member on the module slot periphery, a second shield member at the connector cover slot, and third shield members between the connector accommodating portion and the wiring board, along with a heat sink for thermal management, to prevent EMI noise from radiating outside the housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a relative play is provided between optical module and receptacle for attachment/detachment, then ease of operation is improved, but tight sealing of the gap becomes difficult
Solution Approach 1:
An upper EMI gasket is introduced as an intermediary element between the optical module and the receptacle housing at the module slot opening. This gasket fills the gap and provides EMI shielding while allowing the necessary relative play for attachment and detachment operations.
Solution Approach 2:
The upper EMI gasket is implemented as a flexible thin film structure that can deform to accommodate the relative movement between the optical module and receptacle during attachment and detachment, while maintaining continuous EMI shielding coverage.
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 configuration effectively shields electromagnetic noise within the housing, reducing radiation and enhancing the reliability of noise suppression, thereby improving the overall performance of the communication system.
Implementation Method 1
a first shield member provided on an entire periphery of the module slot and configured to come into contact with the optical module and to shield electromagnetic noise generated in the module accommodating portion so as to avoid radiation of the noise into the housing; a second shield member provided in a region corresponding to a boundary portion between the connector accommodating portion and the module accommodating portion and at the periphery of a slot for the connector cover
Implementation Method 2
a heat sink configured to dissipate heat generated in the optical module
Implementation Method 3
a heat sink configured to dissipate heat generated in the optical module
Data Source
AI summary
In a receptacle cage, a front EMI finger in a tubular shape serving as a first shield member is provided on the entire periphery of a substantially rectangular module slot. In addition, a gap between the peripheral edge of a slot of a cover, into which a plug connector for the optical module connected to a receptacle connector in a receptacle connector accommodating portion is inserted, and a peripheral surface of a plug connector and a gap between a lower surface of the cover and a surface, on which a printed wiring board is mounted, are shielded by an EMI gasket serving as a second shield member and an EMI gasket serving as a third shield member, respectively.