Network Interface Module Shielding for EMC and Grounding Stability
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Solution Overview
Problem
Existing optoelectronic communication modules face challenges with electromagnetic interference (EMI) due to gaps in shielding bodies, leading to poor EMC performance, especially at high frequencies, and require cumbersome installation processes with insufficient positioning, causing network cables to easily disconnect.
Innovation Solution
A module with a network interface featuring a grounding spring sheet connecting the circuit board to the base, combined with a shielding elastic sheet forming a double-layer shielding body, and additional components like a mesh mask plate and cover plate for enhanced stability and shielding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If electromagnetic shielding is only achieved through a shell, then the structure is simple, but high-frequency interference signals enter through gaps causing poor EMC performance
Solution Approach 1:
The shielding structure is divided into multiple segments: a shell for overall enclosure and an additional shielding plate for critical areas. This segmentation allows each component to address specific shielding needs, with the shielding plate filling gaps in the shell to block high-frequency interference signals effectively.
Solution Approach 2:
The shielding solution transitions from a single-dimensional shell enclosure to a multi-dimensional approach by adding a shielding plate that creates additional shielding layers. This dimensional addition addresses the limitation of the shell alone by providing overlapping shielding coverage that blocks signals entering through gaps.
2Object-affected harmful factors
If the circuit board is grounded through traditional methods, then the grounding process is simple, but large-area grounding cannot be achieved
Solution Approach 1:
The grounding connection uses a spring-based dynamic structure instead of rigid fixed connections. The spring grounding component provides continuous contact pressure while accommodating board position variations, enabling large-area grounding contact that maintains electrical connection stability and effectiveness.
Solution Approach 2:
A spring grounding component serves as an intermediary element between the circuit board and the grounding system. This intermediary provides both mechanical compliance and electrical conductivity, facilitating large-area grounding contact while simplifying the manufacturing process through a single integrated component.
3Reliability
If network interface positioning is minimal, then the assembly process is simple, but the network cable is easily pulled out when subjected to external forces
Solution Approach 1:
The positioning structure applies local quality enhancement by adding positioning protrusions and corresponding grooves at specific critical locations of the network interface. These localized features provide precise mechanical engagement points that prevent cable pull-out while maintaining overall assembly simplicity.
Solution Approach 2:
The positioning mechanism uses nested geometric features where positioning protrusions fit into corresponding grooves or recesses. This nesting approach creates inherent mechanical interlocking that secures the network interface without requiring additional fastening components, thus improving reliability while minimizing 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 solution provides improved EMC performance by grounding the circuit board and forming a closed-loop shielding system, effectively blocking high-frequency interference and enhancing connection stability, making it suitable for high-frequency operations and reducing cable disconnection.
Implementation Method 1
the grounding spring sheet is fixed on the circuit board and connected to the base
Implementation Method 2
the shielding elastic sheet and a module shell jointly form the shielding body of the network interface, providing double-layer shielding
Data Source
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AI summary
The present invention relates to the field of optoelectronic communication and provides a module with a network interface. The module with a network interface comprises a base, a circuit assembly, and shielding elastic sheets. The base is provided with a screw seat thereon, and a first boss is provided on a side surface of the base. The circuit assembly comprises a circuit board, a network interface, and a grounding spring sheet. The circuit board is provided with a first notch which is coupled to a side wall of the screw seat; the grounding spring sheet is fixed on the circuit board and connected to the base. The shielding elastic sheet comprises two oppositely arranged side walls, each of which is provided with a folded edge, wherein the folded edge has a first buckling hole, which is buckled into the first boss to fix the shielding elastic sheet on the base. The present invention achieves the grounding of the circuit board and improves the EMC performance of the module through the setting of the shielding elastic sheet and the grounding spring sheet.