Braided USB Cable Helical Stranding for Crosstalk Reduction
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Solution Overview
Problem
Conventional USB 3.0 cables are bulky and prone to crosstalk due to the arrangement of wire pairs, making them difficult to install and increasing assembly and transport costs, while also being susceptible to external interference.
Innovation Solution
The cable design features wire pairs running helically around a common stranding center without twisting, with at least one pair lacking its own shielding and positioned on opposite sides, ensuring a constant crosstalk intensity and a more compact, thinner structure, utilizing a central current-carrying wire for stranding and a common shield for grounding, which reduces the cable diameter by 20-40% and enhances interference suppression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wire pairs are arranged in conventional configuration with individual shielding, then each pair is protected from interference, but the cable becomes bulky and thick making installation difficult
Solution Approach 1:
The patent merges individual pair shielding into a single common shield that surrounds all wire pairs. Instead of providing separate shielding for each differential pair, a unified common shield is implemented that protects all pairs collectively, reducing the overall cable diameter while maintaining interference protection.
Solution Approach 2:
The common shield serves multiple functions simultaneously: it provides electromagnetic shielding for all wire pairs, acts as a reference potential for the differential signals, and eliminates the need for separate individual shields. This multi-functionality reduces structural complexity and cable thickness.
2Reliability
If wire pairs are twisted together, then crosstalk between pairs is reduced, but the cable structure becomes more complex and harder to manufacture
Solution Approach 1:
The patent extracts the twisting operation from the wire pairs and replaces it with a simpler parallel arrangement around a central core. By removing the twisting requirement, the manufacturing process is simplified while crosstalk is controlled through the geometric arrangement and common shielding rather than through twisting.
Solution Approach 2:
Instead of controlling crosstalk through twisting in the longitudinal dimension, the patent arranges wire pairs in a radial pattern around a central core, utilizing the radial dimension. This geometric distribution in the cross-sectional plane provides consistent spacing and crosstalk characteristics without requiring complex twisting operations.
3Reliability
If more shielding is added to protect against external interference, then signal quality improves, but the cable becomes thicker and more expensive
Solution Approach 1:
The common shield is designed to serve multiple purposes: it provides electromagnetic shielding for all differential pairs, establishes a reference potential, and reduces the need for additional grounding structures. This multi-functionality achieves signal quality protection without increasing structural complexity.
Solution Approach 2:
Multiple shielding functions are merged into a single common shield structure. Instead of having separate shields for each pair plus additional external shielding, the common shield combines these functions into one unified structure that is both simpler and more effective.
4Volume of moving object
If wire pairs are arranged closer together to reduce cable size, then cable compactness improves, but crosstalk between pairs increases
Solution Approach 1:
The patent uses an asymmetric arrangement where wire pairs are positioned at different radial distances from the central core. This asymmetric geometric distribution, combined with the common shielding, creates consistent electromagnetic field patterns that reduce crosstalk even in the compact structure.
Solution Approach 2:
The patent controls crosstalk by utilizing the radial dimension and angular positioning of wire pairs around the central core, rather than relying on longitudinal twisting. This geometric control in the cross-sectional plane allows compact arrangement while maintaining consistent crosstalk characteristics through predictable field distribution.
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 compact design reduces cable diameter by approximately 30%, simplifies assembly, and effectively suppresses external interference, allowing for efficient high-current transmission without additional power cables, while maintaining effective shielding and interference decoupling.
Implementation Method 1
each of which is set up to transmit a differential data signal
Implementation Method 2
all wires are surrounded by a common screen 130
Data Source
Figure 1
Figure 2
Figure 3a
AI summary
The invention relates to a cable (10), especially a USB cable, comprising at least two pairs of strands (12, 14, 16), each of which is designed to transmit a differential data signal; in the longitudinal direction (L) of the cable, the at least two pairs of strands (12, 14, 16) extend helically about a common braiding center (20).