EMI Shield for Optoelectronic Modules Using Segmented Faraday Cage
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Solution Overview
Problem
Optoelectronic modules face challenges with alignment issues, hard plug problems, and electromagnetic interference (EMI) due to the emission of electromagnetic radiation from electronic circuitry, which can degrade the performance of surrounding devices.
Innovation Solution
The implementation of an EMI shield with a base and flanges that encircle the optoelectronic module's housing, providing an optical subassembly opening and complementary structures to engage with OSA connector blocks, forming a Faraday cage to reduce EMI emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If electronic circuitry is used in the optoelectronic module, then functional performance is improved, but electromagnetic interference is generated that degrades surrounding devices
Solution Approach 1:
The housing is divided into conductive and non-conductive portions, with the conductive portion forming an EMI shield around specific components. This segmentation allows different material properties to be applied where needed - conductive materials for EMI shielding and non-conductive materials for electrical isolation, resolving the contradiction between functionality and EMI generation.
Solution Approach 2:
The EMI shield is applied locally around the optical subassembly and connector block rather than throughout the entire housing. This localized approach provides EMI protection where it is most needed while minimizing the use of conductive materials and maintaining electrical isolation in other areas, thus improving functional performance without excessive EMI generation.
2Object-generated harmful factors
If conductive materials are used for EMI shielding, then electromagnetic radiation emission is reduced, but electrical isolation between components becomes more difficult
Solution Approach 1:
The housing is segmented into conductive and non-conductive portions, with electrical isolation features integrated at the interfaces between these segments. This allows EMI shielding to be provided where needed while maintaining electrical isolation through the non-conductive portions and integrated isolation features, reducing overall device complexity.
Solution Approach 2:
Electrical isolation features act as intermediaries between conductive EMI shield portions and other conductive components. These isolation features enable electrical isolation without compromising the EMI shielding effectiveness, thus reducing the complexity of achieving both EMI protection and electrical isolation.
3Manufacturing precision
If alignment features are integrated into connector blocks, then assembly precision is improved, but manufacturing complexity increases
Solution Approach 1:
Alignment features are merged with the connector block and housing structures, creating integrated components that provide both mechanical connection and precise alignment functions. This integration improves assembly precision while avoiding the need for separate alignment components, thus reducing manufacturing complexity.
Solution Approach 2:
The connector block and housing structures are designed to serve multiple functions - mechanical support, electrical connection, and precise alignment. This multi-functionality eliminates the need for separate alignment features, improving assembly precision without increasing manufacturing complexity.
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 EMI shield effectively controls the emission of electromagnetic radiation, enhancing the performance of optoelectronic modules by reducing interference and allowing for the use of non-conductive materials in connector blocks without significant radiation emission.
Implementation Method 1
The EMI shield and the housing can form a Faraday cage that reduces or eliminates the emission of electromagnetic radiation from the optoelectronic module.
Data Source
AI summary
An electromagnetic interference (“EMI”) shield that can help control the emission of electromagnetic radiation from an optoelectronic module in which the EMI shield is positioned. In one example embodiment, an EMI shield includes a base and plurality of flanges extending from a perimeter of the base. The base defines an optical subassembly (“OSA”) opening and a plurality of complementary structures. The OSA opening is configured to receive an OSA. Each complementary structure is configured to engage a complementary structure of an OSA connector block.