Shielded Cable Layout for Sharp Bends and Stable Impedance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electrical cables face challenges in mass-termination techniques, flexibility, and maintaining high-speed electrical properties, especially when subjected to bends, which can cause impedance discontinuities and poor electrical performance.
Innovation Solution
A shielded electrical cable design featuring a plurality of conductor sets with insulated conductors, first and second shielding films, and an adhesive layer bonding the shielding films in pinched portions, allowing for sharp bending without significant impedance variation or loss in signal integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional shielded cables are bent sharply, then flexibility is improved, but impedance discontinuities occur and electrical performance deteriorates
Solution Approach 1:
The cable structure is segmented into modular components: individual conductor sets with their own insulation, separate shielding films for each conductor set, and distinct adhesive layers. This segmentation allows each component to move and deform independently during bending, preventing the formation of impedance discontinuities while maintaining overall cable flexibility.
Solution Approach 2:
The cable employs composite material construction combining conductive shielding films with insulating adhesive layers. The adhesive layer acts as a decoupling medium that allows the shielding films to maintain their position and electrical properties during bending, while the composite structure as a whole achieves both flexibility and impedance stability.
2Productivity
If mass-termination techniques are applied to conventional cables, then productivity is improved, but manufacturing precision and electrical performance are compromised
Solution Approach 1:
The cable is designed with uniformly spaced conductor sets that have consistent geometry and electrical properties along their length. This segmentation into standardized units enables automated mass-termination processes to efficiently prepare and terminate multiple conductors simultaneously while maintaining precise alignment and electrical performance.
Solution Approach 2:
The cable structure parameters (conductor spacing, shielding film dimensions, adhesive layer thickness) are optimized to enable mass-termination techniques. The standardized geometry allows for automated stripping and termination equipment to operate with high precision, achieving both high productivity and maintained manufacturing quality.
3Ease of operation
If cable flexibility is increased to enable sharp bends, then ease of operation is improved, but impedance stability deteriorates
Solution Approach 1:
The cable is divided into independent conductor sets, each with its own shielding and insulation. This segmentation allows each set to bend without affecting the electrical properties of adjacent sets, maintaining impedance consistency even during sharp bends while achieving the required flexibility.
Solution Approach 2:
The adhesive layer serves as an intermediary between the shielding films and conductors, and between adjacent conductor sets. During bending, this intermediary layer allows relative movement and deformation while maintaining electrical connections and shielding effectiveness, thus preserving impedance stability despite the cable's flexibility.
Data Source
AI summary
A shielded electrical cable includes conductor sets extending along a length of the cable and spaced apart from each other along a width of the cable. First and second shielding films are disposed on opposite sides of the cable and include cover portions and pinched portions arranged such that, in transverse cross section, the cover portions of the films in combination substantially surround each conductor set. An adhesive layer bonds the shielding films together in the pinched portions of the cable. A transverse bending of the cable at a cable location of no more than 180 degrees over an inner radius of at most 2 mm causes a cable impedance of the selected insulated conductor proximate the cable location to vary by no more than 2 percent from an initial cable impedance measured at the cable location in an unbent configuration.