Multi-core Cable Asymmetry for Skew Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing multi-core cables experience skew and variations in signal attenuation due to uneven force application from insulation and shielding tapes when using parallel signal conductors, leading to inconsistent transmission characteristics, especially at high frequencies.
Innovation Solution
A multi-core cable design where core cables are stranded in parallel without twisting, with an insulation tape and a metal-coated resin tape wrapped spirally around the core unit, ensuring the shielding tape is wrapped in the same direction as the stranding, maintaining a preferred ratio of stranding pitch to wrapping pitch between 10:14, to minimize skew and attenuation differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If insulation tape and metal foil tape are wrapped around the core unit, then shielding and insulation are improved, but uneven force application causes skew and signal attenuation variations
Solution Approach 1:
The patent specifies that the metal foil tape wrapping direction must match the core cable stranding direction, creating an asymmetric configuration that ensures uniform force distribution. This directional alignment prevents differential stress on individual core cables, eliminating the root cause of skew and attenuation variations while maintaining effective shielding.
Solution Approach 2:
The patent establishes specific parameter ranges for stranding pitch (50-700 mm) and wrapping pitch (3-60 mm), with their ratio constrained to 10-14. These parameter specifications ensure that the wrapping force is distributed uniformly across all core cables, preventing the uneven stress that causes signal attenuation inconsistencies while preserving shielding effectiveness.
2Device complexity
If core cables are stranded together to form a core unit, then cable assembly is simplified, but skew occurs due to uneven force distribution
Solution Approach 1:
The patent specifies that the metal foil tape wrapping direction must match the core cable stranding direction, creating an asymmetric configuration that ensures uniform force distribution. This directional alignment prevents differential stress on individual core cables, eliminating the root cause of skew and attenuation variations while maintaining effective shielding.
Solution Approach 2:
The patent establishes specific parameter ranges for stranding pitch (50-700 mm) and wrapping pitch (3-60 mm), with their ratio constrained to 10-14. These parameter specifications ensure that the wrapping force is distributed uniformly across all core cables, preventing the uneven stress that causes signal attenuation inconsistencies while preserving shielding effectiveness.
3Reliability
If parallel signal conductors are used instead of twisted pairs, then skew is reduced, but attenuation variations increase due to uneven tape wrapping forces
Solution Approach 1:
The patent specifies that the metal foil tape wrapping direction must match the core cable stranding direction, creating an asymmetric configuration that ensures uniform force distribution. This directional alignment prevents differential stress on individual core cables, eliminating the root cause of skew and attenuation variations while maintaining effective shielding.
Solution Approach 2:
The patent establishes specific parameter ranges for stranding pitch (50-700 mm) and wrapping pitch (3-60 mm), with their ratio constrained to 10-14. These parameter specifications ensure that the wrapping force is distributed uniformly across all core cables, preventing the uneven stress that causes signal attenuation inconsistencies while preserving shielding effectiveness.
Data Source
AI summary
A multi-core cable in which skew occurs less and attenuation characteristics of all core cables are uniform comprises: a core unit; an insulation tape spirally wrapped around the outer circumference of the core unit; and a metal coated resin tape wrapped over the insulation tape, wherein a plurality of core cables each consisting of two insulated wires arranged in parallel are stranded together to form the core unit, and wherein the metal coated resin tape is wrapped in the same direction as the stranding direction of the core cables.