Low-Profile SFP Connector Assembly with Shielded Cage
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Solution Overview
Problem
Conventional pluggable connector designs are unsuitable for miniaturization, failing to reduce electromagnetic interference (EMI) emissions and increase port density, which are essential for advancing high-speed fiber optic and copper communications.
Innovation Solution
A low-profile electrical connector system with a shield member assembly and insulative housing, featuring alignment slots and tabs, that minimizes EMI emissions and enhances port density by optimizing the placement and configuration of components on a printed circuit board.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional pluggable connector designs are used, then connector functionality is maintained, but electromagnetic interference emissions increase and port density decreases
Solution Approach 1:
The connector assembly is nested within a shield member assembly that extends through the circuit board. The shield member assembly acts as a protective enclosure that contains the connector components while reducing EMI emissions. The insulative housing is nested within the shield member assembly, creating a hierarchical structure that provides both shielding and mechanical support.
Solution Approach 2:
The shield member assembly extends in multiple dimensions through the circuit board, with portions above and below the board surface. This three-dimensional configuration allows the shield to effectively contain EMI emissions while the connector maintains a low profile above the board, increasing port density without compromising shielding effectiveness.
2Productivity
If connector size is reduced for miniaturization, then port density increases, but EMI shielding effectiveness deteriorates
Solution Approach 1:
The shield member assembly is segmented into multiple portions: a first portion above the circuit board, a second portion below the circuit board, and intermediate sections. This segmentation allows each portion to be optimized for its specific function while collectively providing comprehensive EMI shielding. The insulative housing is also segmented to accommodate the connector components while maintaining a compact form factor.
Solution Approach 2:
The assembly combines conductive shield member material with insulative housing material to create a composite structure. The conductive shield member provides EMI shielding while the insulative housing provides mechanical support and electrical isolation. This composite approach allows miniaturization without sacrificing shielding effectiveness.
3Object-affected harmful factors
If shield member assembly is extended through circuit board, then EMI shielding improves, but manufacturing complexity increases
Solution Approach 1:
The shield member assembly is merged with the circuit board structure, with the shield extending through existing board openings. The alignment slots in the insulative housing are merged with alignment features on the circuit board, creating a unified assembly that simplifies manufacturing. The connector components are integrated into the shield member assembly, reducing the number of separate parts.
Solution Approach 2:
The insulative housing acts as an intermediary between the connector components and the shield member assembly. It provides a mounting structure that facilitates assembly while maintaining electrical isolation. The alignment slots and features serve as intermediaries that guide proper positioning during manufacturing and assembly processes.
Data Source
AI summary
An electrical connector assembly having shielded cage assembly with a plurality of ports for receiving modules. In one embodiment, the modules comprise SFP (small form-factor pluggable) modules, and the electrical connector assembly is adapted for low-profile applications, thereby optimizing the amount of area and volume occupied by the SFP assembly. In one variant, the SFP modules are pluggable into individual ports, whereby two modules are interconnected to a single header connector interconnected to a motherboard. Methods of manufacturing the connector assembly are also disclosed.