Cable Assembly Grounding via Shielding Cage Resilient Rib
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Solution Overview
Problem
Existing cable assemblies lack an effective grounding structure in their internal printed circuit boards, which can lead to inadequate electromagnetic interference (EMI) shielding.
Innovation Solution
A cable assembly design featuring a shielding cage with a resilient rib that electrically contacts a ground pad on the inner board, along with a configuration of power and differential signal wires soldered to specific pads, enhancing the grounding and EMI shielding capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a metal cage is provided in an electrical connector for reducing EMI emissions, then electromagnetic interference shielding is improved, but the grounding structure in the internal PCB becomes inadequate
Solution Approach 1:
The grounding structure is segmented into multiple independent grounding paths: ground wires soldered to the PCB, a resilient rib extending from the metal cage to contact the PCB, and ground pads on the PCB. This segmentation ensures that each component contributes to the overall grounding, preventing any single point of failure and improving EMI shielding effectiveness.
Solution Approach 2:
The resilient rib is designed to electrically connect the metal cage to the PCB ground pad, establishing an equipotential relationship between these components. This ensures that the metal cage and PCB maintain the same electrical potential, improving grounding reliability and reducing EMI by preventing potential differences that could cause interference.
2Reliability
If ground wires are soldered to the PCB in a cable end connector, then electrical connection is established, but the grounding structure remains insufficient for effective EMI shielding
Solution Approach 1:
The invention merges multiple grounding functions into a unified structure: the resilient rib serves both as a mechanical support element and an electrical ground connection path. The metal cage is integrated with the PCB through this rib, combining structural integrity with EMI shielding and grounding functions in a single integrated solution.
Solution Approach 2:
The resilient rib acts as an intermediary element between the metal cage and the PCB ground pad. It provides a reliable electrical connection path that bridges the gap between these two components, ensuring effective grounding and EMI shielding while accommodating any misalignment or tolerance variations in the assembly.
3Ease of operation
If a conductive band is formed around the PCB surface, then electrical connection between housing portions and bias is facilitated, but the grounding structure in the internal PCB remains inadequate
Solution Approach 1:
Instead of relying on a conductive band around the entire PCB surface, the invention applies grounding locally at critical points: ground pads are placed at specific locations on the PCB, and the resilient rib makes contact at a defined position. This localized grounding approach is more effective than a distributed conductive band, providing reliable EMI shielding where it is most needed.
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 EMI shielding and reliable electrical connections by ensuring a consistent ground level between the shielding cage and the inner board, effectively reducing electromagnetic interference.
Implementation Method 1
a resilient rib inwardly extending from one of the top cage and the bottom cage, said resilient rib resiliently and electrically contacting with the first ground pad
Implementation Method 2
said wires including a plurality of power wires soldered to the first pads, and a plurality of differential signal wires soldered to the second pads
Data Source
AI summary
A cable assembly (100) includes a cover (8) defining an outer cavity (822), a shielding cage (7) defining an inner cavity (712) and being mounted into the outer cavity, an inner board (20) assembled in said inner cavity, and a cable (5) assembled onto the inner board. The inner board includes a top surface (38), a bottom surface (37) and two side surfaces (31). The side surface has a first ground pad (310) adapted to connect with the shielding cage, the bottom surface has a second ground pad (33) adapted to connect with the cable, and the top surface has a third ground pad (343) adapted to connect with the cable.