EMI Shield for Cable-Bulkhead Interface
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Solution Overview
Problem
Existing EMI/RFI shielding solutions for enclosures housing electrical equipment are limited by their inability to effectively shield connectors of non-circular geometries and often require tools for mating and un-mating, which can lead to EMI/RFI leakage and inefficiencies in high-frequency operations.
Innovation Solution
An EMI/RFI shield assembly featuring electrically conductive walls with integrated gaskets that compressibly engage shielded connectors, providing a conductive path between the connectors and the equipment panel, allowing for quick connect/disconnect capabilities and effective shielding across various connector geometries without the need for tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If threaded connectors are used to provide EMI/RFI shielding, then shielding effectiveness is improved, but connector versatility and ease of operation deteriorate due to tool requirements and circular geometry limitation
Solution Approach 1:
The bulkhead connector is designed with a universal interface that can accommodate multiple connector types including rectangular, circular, and other geometries. The EMI/RFI shield structure provides a standardized mounting interface that works with various connector forms, eliminating the need for different shield designs for different connector types while maintaining effective shielding across all applications.
Solution Approach 2:
The EMI/RFI shield is divided into separate functional components: a bulkhead connector portion that interfaces with the enclosure, a cable assembly portion that interfaces with the cable shield, and a gasket portion that provides sealing and electrical contact. This segmentation allows each component to be optimized for its specific function while maintaining overall system versatility and shielding effectiveness.
2Reliability
If threaded connectors are used to provide EMI/RFI shielding, then shielding effectiveness is improved, but ease of operation worsens due to tool requirements for mating and un-mating
Solution Approach 1:
The connector incorporates self-aligning and self-latching features that enable automatic mating and un-mating without tools. The EMI/RFI shield structure includes compliant contact elements that automatically establish electrical connection when connectors are mated, and release mechanisms that allow easy disconnection while maintaining shielding integrity throughout the connection process.
3Reliability
If tight seals are used between cable assemblies and enclosures, then EMI/RFI leakage is reduced, but connector adaptability to different geometries deteriorates
Solution Approach 1:
The EMI/RFI shield incorporates flexible gasket materials and compliant contact elements that can deform to accommodate different connector geometries while maintaining tight sealing. The gasket portion includes elastomeric or foam materials that conform to the specific shape of various connectors, ensuring effective EMI/RFI leakage prevention across rectangular, circular, and other connector types without requiring geometry-specific rigid seal structures.
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 enhances EMI/RFI shielding by providing a low-impedance path to chassis ground, reducing leakage, and improving connector alignment and stability, especially at high frequencies, while supporting connectors of different geometries and enabling tool-free operation.
Implementation Method 1
The gasket and the wall provide an electrically conductive path between the cable assembly and the equipment panel
Data Source
AI summary
An electromagnetic interference and radio frequency interference (EMI/RFI) shield adapted to reduce unwanted EMI/RFI from a shielded cable assembly—equipment enclosure interface. The EMI/RFI shield includes one or more conductive walls extending substantially perpendicular from an outer surface of the shielded enclosure. The one or more walls are positioned adjacent to sides of a panel-mounted connector. Each of the walls includes an EMI/RFI gasket segment coupled thereto, each gasket segment positioned to engage compressibly a respective side of a shielded cable assembly when it is coupled to the panel-mounted connector. Each engaged side of the shielded cable assembly is in electrically conductive contact with the shielded equipment enclosure through the respective EMI/RFI gasket segment and adjoining wall. Additionally, the EMI/RFI shield provides mechanical support to the interconnected cable assembly further reducing EMI/RFI by improving alignment of the coupled connector.