Data Cable Stranding and Dielectric Design for High Frequency Stability
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Solution Overview
Problem
Conventional data transmission cables, particularly in the automotive sector, face issues with maintaining transmission properties in high frequency ranges and mechanical stability due to geometry changes and external influences, leading to signal disruptions and poor field guidance.
Innovation Solution
A cable design featuring two insulated line wires with a first dielectric surrounding them, an interior space filled with the stranded line pair, and a second dielectric surrounding the first dielectric, along with a shielding structure that enhances field guidance and mechanical stability by relocating coupling between the line wires and dielectrics, improving symmetry and transmission properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the inner conductors are stranded with a predetermined strand lay length and strand lay direction, then the cable has mechanical flexibility, but periodic changes in geometry cause breakdowns in transmission properties at high frequencies
Solution Approach 1:
The patent extracts the problematic periodic geometry changes by removing the conventional stranding structure with fixed lay length. Instead, the inner conductors are stranded without a predetermined strand lay length, eliminating the periodic variations that cause signal breakdowns while retaining mechanical flexibility through the stranding itself.
Solution Approach 2:
The patent changes the parameter of strand lay length from a predetermined fixed value to a variable or undefined parameter. This parameter change eliminates the periodic geometry changes that cause transmission breakdowns while maintaining the mechanical benefits of stranding.
2Reliability
If a separating foil is removed between inner conductors and inner dielectric, then adhesion occurs, but press fit requires very great leakage force
Solution Approach 1:
The patent applies local quality by creating different structural characteristics in different regions. The inner conductors have irregular surfaces that provide localized adhesion points with the dielectric, while the overall structure maintains appropriate mechanical separation to reduce press fit forces.
3Strength
If external forces exceed a critical point, then wire insulation collapses and transmission properties are disrupted, but increasing mechanical strength reduces field guidance optimization
Solution Approach 1:
The patent uses composite material structures with the dielectric having specific mechanical properties that provide both strength and electrical characteristics. The combination of materials creates a structure that resists external forces while maintaining optimized field guidance properties.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed cable achieves improved transmission properties in higher frequency ranges and increased mechanical stability, ensuring reliable data transmission and field guidance without signal disruptions, even under external influences.
Implementation Method 1
a first dielectric which at least partly surrounds the two line wires, wherein the first dielectric is arranged partly on outer surfaces of the insulated line wires
Data Source
AI summary
A cable (100; 200) for electrically transmitting data includes two insulated line wires (110, 111), each of which has an inner conductor (110-1, 111-1) and which are stranded together in order to form a stranded line pair. A first dielectricum (130, 230) at least partly surrounds the two line wires (110, 111), and is at least partly arranged on the outer surface of the insulated line wires (110, 111). An interior at least partly enclosed by the first dielectricum (130) is partly filled with the stranded line pair. A second dielectricum (150) at least partly surrounds the first dielectricum (130; 230). A shielding (160, 170, 180) at least partly surrounds the second dielectricum (150). The first dielectricum (130; 230) is arranged at at least a specified distance (A) to the shielding (160).