Impedance Matching Cable Compensation Area
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Solution Overview
Problem
High-speed data transmission in vehicles is hindered by impedance mismatches between cables and connectors, leading to increased reflections and interference, particularly due to the geometric and material limitations of standard connector systems which are inflexible and costly.
Innovation Solution
A cable with a compensation area at its end portion, where the conductors are closer together than elsewhere, utilizing a clamping means and an intermediate layer of higher permittivity to reduce impedance, and potentially coated with conductive materials to achieve a matched impedance suitable for high data rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If standard connector systems are used, then connector design is simplified and costs are reduced, but impedance mismatch increases causing reflections and interference
Solution Approach 1:
The patent applies local quality by creating a compensation area with specific geometric characteristics (smaller cross-section, conductors closer together) at the cable end portion. This localized modification allows the cable to adapt to standard connector systems while maintaining proper impedance matching, thus preserving transmission quality without requiring custom connector designs.
Solution Approach 2:
The patent changes physical parameters of the cable end portion by reducing the cross-sectional area and decreasing the distance between conductors in the compensation area. These parameter changes lower the impedance in this specific region, enabling impedance matching with standard connectors and reducing reflections and interference.
2Reliability
If conductor distance is reduced in compensation area, then impedance is lowered to match connectors, but cable geometry becomes more complex
Solution Approach 1:
The patent segments the cable into distinct regions: a standard cable portion and a compensation area at the end portion. This segmentation allows the cable to maintain its standard geometry for most of its length while introducing a localized geometric modification only where needed for impedance matching, thus minimizing overall complexity.
3Reliability
If cable end portion is modified for impedance matching, then transmission quality improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies partial action by modifying only the end portion of the cable rather than the entire cable. This localized modification reduces the overall impact on manufacturing precision requirements, as only a small segment of the cable needs to meet the specific geometric criteria for impedance matching, while the rest of the cable can be manufactured using standard tolerances.
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 solution effectively reduces impedance mismatches, minimizing reflections and interference, allowing for reliable high-speed data transmission by adapting the cable to existing connector systems, thereby improving transmission quality and flexibility while reducing costs.
Implementation Method 1
The intermediate layer may have a higher permittivity than the clamping means
Data Source
AI summary
An electrical cable includes a first wire conductor separated from a second wire conductor and a compensation area proximate to, but separated from, an end portion of the cable and a method of manufacturing such an electrical cable. The first and second wire conductors are each connected to a contact element. The first and second wire conductors are separated by a first distance within the compensation area. The first and second wire conductors are separated by a second distance outside of the compensation area. The first distance is less than the second distance, thereby decreasing an impedance of the cable within the compensation area.