Shielded Data Cable for High-Speed Differential Signal Transmission
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Solution Overview
Problem
Current star quad cables face limitations in transmitting high data rates (>2 GBit/s) due to increased mode conversion, crosstalk, and cable attenuation at higher frequencies, especially with long cable lengths, which affects the quality of differential signal transmission.
Innovation Solution
The data cable incorporates at least two conductors with conductor shields and a collective shield for enhanced shielding, along with a non-electrically conductive casing and filler strands to minimize interference and improve electromagnetic compatibility, allowing for effective transmission of differential and asymmetrical signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If star quad arrangement is used to achieve high crosstalk attenuation and compact cable design, then crosstalk attenuation is improved and cable compactness is improved, but mode conversion and crosstalk increase at higher frequencies (>2 GBit/s)
Solution Approach 1:
The cable is segmented into multiple shielded conductor pairs, with each pair independently shielded by an individual shield. This segmentation isolates the differential signals from each other and from external interference, preventing mode conversion and crosstalk at high frequencies while maintaining the compact star quad geometry.
Solution Approach 2:
The patent implements a nested shielding structure where individual shields around each conductor pair are nested within a common outer shield. This multi-layer nested shielding approach provides progressive protection against electromagnetic interference and maintains signal integrity at high data rates up to 5 GBit/s.
2Reliability
If conductor shields are added to each conductor to reduce interference, then electromagnetic compatibility is improved, but cable complexity and manufacturing difficulty increase
Solution Approach 1:
Each conductor pair is assigned its own individual shield, creating segmented shielding zones. This segmentation allows each differential pair to be independently protected from electromagnetic interference, significantly improving electromagnetic compatibility and reducing crosstalk between pairs.
Solution Approach 2:
The individual conductor shields are nested within a common outer shield, creating a hierarchical shielding structure. This nested configuration provides comprehensive electromagnetic protection while maintaining a compact overall cable diameter and simplifying the integration of multiple shielding layers.
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
This configuration reduces crosstalk and mode conversion, increases the maximum operating frequency, and supports high-quality transmission of both differential and common mode signals, enabling reliable data transmission at higher rates while maintaining mechanical integrity and flexibility.
Implementation Method 1
each of the at least two conductors includes a conductor shield; and an additional common shielding in the form of a collective shield, wherein the conductor shields are in electrical contact with the collective shield
Data Source
AI summary
A data cable with at least two conductors for a differential transmission of data signals as well as a casing which surrounds the conductors. Each of the conductors has a conductor shield. The data cable uses asymmetrical data signals transmitted together with differential data signals via at least one of the at least two conductors.