Shielded Ribbon Cable Layout for Dense High-Speed Mass Termination
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Solution Overview
Problem
Existing electrical cables face limitations in mass-production, termination efficiency, flexibility, and high-speed signal transmission due to requirements for specific connectors and inadequate high-frequency isolation, particularly in applications needing high-speed data transmission and cost-effectiveness.
Innovation Solution
Development of shielded electrical ribbon cables with a planar format, featuring multiple conductor sets, shielding films, and on-demand or multiple drain wires, allowing for dense packing, high-frequency isolation, and flexible termination techniques, including mixed conductor sets for varying data transmission speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional shielded cables are used, then electrical shielding is provided, but mass-termination techniques cannot be applied and connector complexity increases
Solution Approach 1:
The cable is segmented into multiple individually insulated conductors arranged in parallel, with each conductor capable of being terminated separately. The shielding is also segmented into multiple shielding layers positioned between conductor sets, allowing for modular mass-termination processes while maintaining electrical isolation between signal paths.
Solution Approach 2:
The cable transitions from a traditional three-dimensional coaxial or twisted-pair structure to a planar two-dimensional arrangement of parallel conductors. This dimensional change enables mass-termination techniques by allowing all conductors to be accessed and connected in a single plane, eliminating the need for complex multi-dimensional connector assemblies.
2Area of stationary object
If conductor sets are packed densely to reduce cable width, then high-frequency isolation and low crosstalk are maintained, but cable flexibility may be reduced
Solution Approach 1:
Different regions of the cable have different structural properties. The conductor sets are densely packed in the central region to minimize width, while the outer regions incorporate flexible jacket material and allow for controlled bending. The shielding layers are positioned to provide electrical isolation without creating rigid structural constraints that would reduce overall cable flexibility.
3Object-affected harmful factors
If multiple shielding layers are added to improve high-frequency isolation, then crosstalk between channels is reduced, but cable complexity and manufacturing difficulty increase
Solution Approach 1:
Multiple shielding functions are merged into a unified layered structure. The first and second shielding layers are positioned between opposite sides of the cable, working together to provide comprehensive electromagnetic interference protection. This combined shielding approach achieves superior high-frequency isolation while maintaining a relatively simple manufacturing process compared to adding separate shielding components.
4Reliability
If drain wires are added to improve shielding effectiveness, then electrical connection of shielding layer is enhanced, but cable structure becomes more complex
Solution Approach 1:
The drain wire serves multiple functions simultaneously: it provides electrical connection for the shielding layer, acts as a reference ground for signal conductors, and contributes to the overall mechanical strength of the cable. This multi-functional element enhances shielding effectiveness without significantly increasing structural complexity, as it integrates seamlessly with the existing cable architecture.
Data Source
AI summary
A shielded electrical ribbon cable includes adjacent first and second longitudinal conductor sets where each conductor set includes two or more insulated conductors. The first conductor set also includes a ground conductor that generally lies in the plane of the insulated conductors of the first conductor set. At least 90% of the periphery of each conductor set is encompassed by a shielding film. First and second non-conductive polymeric films are disposed on opposite sides of the cable and form cover portions substantially surrounding each conductor set, and pinched portions on each side of each conductor set. When the cable is laid flat, the distance between the center of the ground conductor of the first conductor set and the center of the nearest insulated conductor of the second conductor set is σ1, the center-to-center spacing of the insulated conductors of the second conductor set is σ2, and σ1/σ2 is greater than 0.7.