Cable Apparatus Shielding Shell for High-Speed Signal Crosstalk Reduction
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Solution Overview
Problem
Existing high-frequency cable apparatuses suffer from signal transmission crosstalk due to exposed soldering portions, which reduces transmission quality and prevents stable high-speed signal transmission.
Innovation Solution
A cable apparatus design featuring a circuit board with ground and signal pads, differential signal terminals with elastic and contacting portions, and a shielding shell that wraps around the cable cores and terminals for comprehensive electromagnetic shielding, ensuring continuous shielding coverage and reduced crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the conductor is soldered to the connector terminal with exposed soldering portion, then the cable can transmit high speed differential signals, but the shield tape cannot shield crosstalk at the soldering portion causing signal transmission quality degradation
Solution Approach 1:
The patent implements a nested shielding structure where the shielding layer is positioned inside the shielding shell, both surrounding the cable core and soldering portion. The shielding layer wraps the cable core while the shielding shell encloses the entire assembly including the soldering area, creating multiple concentric shielding barriers that effectively block crosstalk while maintaining high-speed signal transmission capability
2Device complexity
If the shield tape wraps adjacent insulation bodies, then the cable structure is simplified, but the exposed soldering portion creates crosstalk between adjacent differential signal pairs
Solution Approach 1:
The patent employs a flexible shielding shell that can be formed into a cup-like structure to enclose the cable core and soldering portion. This thin-walled metallic shell provides effective electromagnetic shielding while maintaining structural flexibility and ease of assembly, thereby improving signal transmission reliability without significantly increasing overall device complexity
Solution Approach 2:
The patent introduces a grounding connection as an intermediary element that links the shielding layer and shielding shell to ground. This grounding intermediary provides a reference potential and dissipates electromagnetic interference, effectively reducing crosstalk and improving signal transmission reliability between adjacent differential signal pairs
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 design achieves effective electromagnetic shielding isolation, enabling stable transmission of high-frequency signals at higher rates by preventing crosstalk and ensuring continuous shielding coverage from front to back of the differential signal terminals and cable cores.
Implementation Method 1
a shielding layer wrapping the two insulating layers... One end of the shielding shell is covered on the contacting portions and conducts with the shielding layer, and the other end of the shielding shell is covered on the elastic portions and is connected to the ground pads
Data Source
AI summary
A cable apparatus includes a circuit board having ground and signal pads, an insulating body in front of the circuit board, a pair of differential signal terminals retained in the insulating body, a cable located in front of the insulating body, and a shielding shell fixed to the insulating body. One ground pad is provided on each of two sides of adjacent two signal pads. Each terminal has an elastic portion extending out of the insulating body and conducting the signal pad, and a contacting portion exposed on a surface of the insulating body. The cable has two cable cores connected to the contacting portions, two insulation layers respectively wrapping the cable cores, and a shielding layer wrapping the insulation layers. The shielding shell has one end covering the contacting portions and conducting the shielding layer, and the other end covering the elastic portions and connected to the ground pads.