Twisted Pair Cable Assembly for 5 Gb/s Automotive Data Transmission
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Solution Overview
Problem
Current electrical connection systems, such as coaxial cables, fail to support high data transfer rates of 5 Gb/s required for applications like infotainment systems in vehicles, while fiber optic cables are too expensive for cost-sensitive applications, and existing twisted pair cables lack the necessary flexibility and low mass for automotive use.
Innovation Solution
A wire cable assembly with a pair of conductors and a conductive sheet that isolates the wire pair from electromagnetic interference, using dielectric belting to maintain consistent radial distance and twist angle, allowing for efficient transmission of digital signals at 5 Gb/s with reduced manufacturing costs and improved flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If fiber optic cable is used to achieve high data transfer rates, then data transfer rate is improved, but cost increases significantly
Solution Approach 1:
The patent uses a copper-based twisted pair cable construction instead of expensive fiber optic cable, achieving 5 Gb/s data transfer rates with a cost-effective copper conductor solution that is suitable for mass-market automotive applications
Solution Approach 2:
The patent optimizes the twisted pair geometry parameters including twist rate, conductor diameter, and insulation thickness to achieve 5 Gb/s data transfer rates while maintaining cost-effectiveness and compatibility with existing copper cable manufacturing infrastructure
2Ease of operation
If twisted pair cable is used to achieve flexibility and low mass, then ease of operation is improved, but data transfer rate is insufficient
Solution Approach 1:
The patent applies different properties to different parts of the cable: the inner conductors are twisted for flexibility and EMI rejection, while the outer shielding layer provides electromagnetic interference protection, and the dielectric insulation maintains consistent impedance, collectively enabling 5 Gb/s data transfer rates
Solution Approach 2:
The patent uses a composite cable construction with copper conductors, dielectric insulation material, and conductive shielding layer, combining the flexibility of copper with the EMI protection of shielding to achieve both high data transfer rates and automotive-grade durability
3Reliability
If coaxial cable is used to achieve electromagnetic interference immunity, then reliability is improved, but data transfer rate is insufficient
Solution Approach 1:
The patent segments the cable into distinct functional layers: inner twisted conductors for signal transmission, dielectric insulation for impedance control, and outer conductive shielding for EMI protection, achieving both high data transfer rates and electromagnetic interference immunity
4Speed
If multiple twisted pairs are used in twisted pair cable to achieve high data transfer rate, then data transfer rate is improved, but mass increases
Solution Approach 1:
The patent makes the single twisted pair capable of supporting multiple functions: differential signal transmission for high-speed data, EMI rejection through twisting, and impedance control through consistent geometry, eliminating the need for multiple separate twisted pairs and reducing overall cable mass
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 wire cable assembly effectively transmits digital signals at 5 Gb/s with consistent impedance and reduced mass, meeting the requirements of high-speed data transfer while being cost-effective and flexible enough for automotive applications.
Implementation Method 1
a conductive sheet and braided conductor to isolate the wire pair from electromagnetic interference
Implementation Method 2
The wire pair is encased within dielectric belting that helps to provide a consistent radial distance between the wire pair and the shield
Data Source
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AI summary
An electrical connection system configured to terminate electrical connectors and to transmit digital electrical signals having a data transfer rate of 5 Gigabits per second (Gb/s) or higher. The system includes a first parallel mirrored pair of terminals (160, 162) having a planar connection portion (164, 166) and a second pair of parallel mirrored terminals (132, 134) having a cantilever beam portion (136, 140) and contact points (138, 142) configured to contact the first terminals (160, 162). The cantilever beam portions (136, 140) are generally perpendicular to the planar connection portions (164, 166). The terminals (132, 134 & 160, 162) cooperate to provide consistent characteristic impedance. The connection system further includes an electromagnetic shield (172, 174) that longitudinally surrounds the terminals (132, 134 & 160, 162). The connection system is suited for terminating wire cables (100) transmitting digital signals using data transfer protocols such as Universal Serial Bus (USB) 3.0 and High Definition Multimedia Interface (HDMI) 1.3