Differential Signal Cable Shield Gap Reduction
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Solution Overview
Problem
Differential signal transmission cables experience signal propagation delays and rapid attenuation in high frequency bands due to unintended gaps between insulation and shield tapes, leading to signal skew and loss in reception.
Innovation Solution
A differential signal transmission cable design featuring a shield tape conductor with overlapping ends, wrapped with spirally wound resin tapes in the same circumferential direction to minimize gaps, using adhesive layers for secure bonding and tension control to prevent misalignment and pivot during winding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the shield tape is wrapped around the insulation with ends overlapped together, then continuous shielding is achieved, but gaps occur in the overlapped portions causing signal skew and attenuation
Solution Approach 1:
The shield tape wrapping is divided into multiple sections with overlapping portions, where each overlap is precisely controlled to maintain continuous shielding while minimizing gap formation. The segmentation allows for controlled overlaps that prevent gaps without creating excessive complexity.
Solution Approach 2:
The width of the shield tape and the overlap length are optimized as key parameters. By adjusting these dimensions, the patent achieves continuous shielding coverage while minimizing the risk of gap formation in overlapped portions, thereby resolving the contradiction between reliability and manufacturing precision.
2Stability of the object's composition
If resin tapes are doubly wound around the shield tape, then structural stability is improved, but pivots and gaps are more likely to occur between insulation and shield tape
Solution Approach 1:
The resin tapes are pre-positioned and pre-tensioned before the final winding process. This preliminary action ensures that the tapes are properly aligned and tensioned, preventing pivots and gaps from occurring during the double winding process, thus maintaining both structural stability and manufacturing precision.
Solution Approach 2:
The winding process incorporates tension control mechanisms that provide feedback during the wrapping process. This real-time feedback allows for adjustment of winding parameters to prevent gap formation while maintaining the required structural stability from double winding.
3Reliability
If circumferential spiral winding directions of tapes are opposite each other, then shielding coverage is improved, but gaps occur causing rapid signal attenuation in high frequency bands
Solution Approach 1:
The patent employs asymmetric winding configurations where the spiral winding directions of the resin tapes are coordinated rather than opposite. This asymmetric approach eliminates the gaps caused by opposite winding while still achieving comprehensive shielding coverage, thereby maintaining high-frequency signal transmission reliability.
Solution Approach 2:
Different sections of the cable shielding employ different winding directions optimized for local requirements. By varying the winding configuration locally rather than applying a uniform opposite-direction pattern, the patent achieves continuous coverage without gaps while adapting to local structural needs.
Data Source
AI summary
A differential signal transmission cable includes an insulated wire including a pair of differential signal transmission conductors coated with an insulation, a shield tape conductor made of a band-like member including an electrically conductive metal layer, and wrapped along an outer surface of the insulated wire so that its ends in a width direction are overlapped together, a first resin tape spirally wound along an outer surface of the shield tape conductor and around an outer side of the shield tape conductor, and a second resin tape spirally wound along an outer surface of the first resin tape and around an outer side of the first resin tape. The shield tape conductor, the first resin tape and the second resin tape are wound in a same circumferential direction around a center axis of the insulated wire.