Cable Design Integrating Shielding as Ground Wire
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Solution Overview
Problem
Existing high-speed cables have low high-frequency test bandwidth and poor stability, with the ground wire being easily misaligned during bending.
Innovation Solution
A cable design featuring a pair of wires with a conductor and wire insulation layer, an inner insulation layer wrapping around the wires to fix them, a metal shielding layer with an insulating substrate and conductive layer facing an outer insulation layer, which acts as a ground wire, eliminating the need for a separate ground wire and enhancing stability and bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate ground wire is used in the cable structure, then the cable can provide grounding function, but the ground wire is easily misaligned during bending and the stability is poor
Solution Approach 1:
The patent combines the ground wire function with the metal shielding layer by making the metal shielding layer longitudinally wrapped around the wires serve as the ground wire. This integration eliminates the need for a separate ground wire, preventing misalignment during bending while maintaining grounding functionality.
Solution Approach 2:
The metal shielding layer is designed to perform multiple functions simultaneously: providing electromagnetic shielding and serving as the ground wire. This multi-functionality reduces the number of separate components needed while improving structural stability during cable bending.
2Object-affected harmful factors
If a metal shielding layer is added to the cable structure, then electromagnetic shielding is improved, but the high-frequency test bandwidth is limited
Solution Approach 1:
The patent optimizes the parameters of the metal shielding layer, including its resistance (0.15Ω/100m to 0.5Ω/100m) and capacitance (20pF/100m to 40pF/100m), to achieve a balance between electromagnetic shielding effectiveness and high-frequency signal transmission capability, enabling bandwidth exceeding 40G.
Solution Approach 2:
The cable employs a composite structure with the metal shielding layer integrated with the inner insulation layer and outer jacket, creating a unified structure that provides both electromagnetic shielding and high-frequency transmission performance through optimized material composition and layer configuration.
3Object-affected harmful factors
If the metal shielding layer is wrapped around the wires, then shielding effectiveness is improved, but the ground wire alignment issues persist during bending
Solution Approach 1:
The patent merges the ground wire function into the metal shielding layer itself, which is longitudinally wrapped around the wires. This integration ensures that the grounding path remains stable and aligned during cable bending, as the metal shielding layer maintains its position relative to the inner insulation layer.
Data Source
AI summary
A cable includes a pair of wires each having a conductor and a wire insulation layer wrapped around the conductor, an inner insulation layer wrapped around the wire insulation layer of each of the wires and fixing the wires, a metal shielding layer wrapped around an outer surface of the inner insulation layer, and an outer insulation layer wrapped around an outer surface of the metal shielding layer. The metal shielding layer has an insulating substrate and a metal conductive layer coated on the insulating substrate. The metal conductive layer of the metal shielding layer faces the outer insulation layer.