Shielded Cable Assembly for 5 Gb/s Signal Transmission
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Solution Overview
Problem
Current cable technologies, such as coaxial cables, struggle to support high data transfer rates of 5 Gb/s required for applications like USB 3.0 and HDMI 1.4, while also needing to be flexible, lightweight, and cost-effective for use in vehicles and other data communication systems, without the fragility and high cost of fiber optic cables.
Innovation Solution
A shielded wire cable assembly with a pair of conductors and a dielectric structure maintaining consistent radial spacing between the conductors and the shield, along with a braided conductor for electromagnetic interference isolation, which provides controlled impedance and high data transfer rates up to 5 Gb/s without modulation or encoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If coaxial cable is used, then electromagnetic interference immunity is improved, but data transfer rate capability deteriorates (cannot support 5 Gb/s)
Solution Approach 1:
The cable is segmented into multiple independent twisted pairs, each capable of carrying high-speed signals. This segmentation allows each pair to be optimized for high-frequency performance while maintaining EMI immunity through individual shielding or twisting patterns, enabling 5 Gb/s data transfer rates.
Solution Approach 2:
The cable employs composite construction combining twisted pair conductors with dielectric insulation and shielded structures. This composite design integrates the EMI immunity of shielded cables with the high-speed capabilities of twisted pair technology, achieving both 5 Gb/s data rates and electromagnetic interference protection.
2Speed
If fiber optic cable is used, then data transfer rate is improved (supports up to 100 Gb/s), but cost and fragility worsen (requiring field service and significantly more expensive)
Solution Approach 1:
The cable uses copper-based twisted pair technology instead of expensive fiber optic materials, providing a cost-effective alternative that is easier to manufacture and install. While fiber optic supports higher speeds, this copper-based solution provides sufficient performance for 5 Gb/s applications at lower cost without requiring specialized installation equipment or field service.
3Speed
If twisted pair cable is used, then data transfer rate above 5 Gb/s is achieved, but cable mass and rigidity worsen (requiring multiple twisted pairs increasing mass)
Solution Approach 1:
The cable merges multiple functions into a single twisted pair structure: data transmission, EMI shielding, and impedance control are all integrated into one compact design. This consolidation achieves 5 Gb/s data transfer rates without requiring multiple separate twisted pairs, reducing overall cable mass and improving flexibility for automotive applications.
4Reliability
If cable is designed for high data transfer rate, then signal transmission quality is improved, but flexibility and mass worsen
Solution Approach 1:
The cable employs flexible dielectric insulation and thin shield structures that maintain controlled impedance and signal quality while allowing the cable to be bent and routed. This flexible construction enables the cable to meet both high-speed signal transmission requirements and the flexibility needed for automotive wiring harness integration.
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 cable assembly achieves data transfer rates of 5 Gb/s with low insertion loss and intra-pair skew, meeting USB 3.0 and HDMI 1.4 specifications, while being flexible and cost-effective, suitable for automotive and other applications.
Implementation Method 1
a dielectric structure configured to maintain a first predetermined spacing between the first inner conductor and the second inner conductor and a second predetermined spacing between the first inner conductor and the second inner conductor and the shield
Implementation Method 2
a shield surrounding the first inner conductor and the second inner conductor... an inner shield conductor at least partially enclosing the dielectric structure... and an outer shield conductor at least partially enclosing the inner shield conductor
Data Source
AI summary
A shielded cable assembly capable of transmitting signals at speeds of 3.5 Gigabits per second (Gb/s) or higher without modulation or encoding over a single pair of conductors. The cable has a characteristic impedance of 95 Ohms and can support transmission data according to either USB 3.0 or HDMI 1.4 performance specifications. The wire cable includes a pair of conductors, a shield surrounding the conductors, and a dielectric structure configured to maintain a first predetermined spacing between the conductors and a second predetermined spacing between said conductors and said shield. The shield includes an inner shield conductor enclosing the dielectric structure and an outer shield conductor enclosing the inner shield conductor.