Electrical Cable Shield Void for Signal Skew Minimization
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Solution Overview
Problem
Shielded electrical cables suffer from signal timing skew due to air voids created by overlapping cable shields, which affect the dielectric constant and lead to imbalance in signal transmission between differential pair conductors.
Innovation Solution
The electrical cable design includes a cable shield with a void positioned between the conductors to balance the dielectric constants, minimizing skew by equally affecting both signals, with the void's volume and location selected to achieve zero or near-zero skew effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a cable shield is wrapped around the conductor assembly, then electromagnetic interference protection is improved, but air voids are created at the overlap location causing signal timing skew
Solution Approach 1:
The patent converts the harmful air void created by cable shield overlap into a beneficial feature by deliberately positioning and sizing the void to balance dielectric constants. Instead of eliminating the void, the invention uses it to counteract timing skew, transforming the manufacturing defect into a performance-enhancing element that equalizes signal propagation between differential pair conductors
Solution Approach 2:
The patent applies local quality by creating a specific void configuration at a precise location (aligned with the transverse axis between conductors) rather than uniformly distributing material throughout. This localized modification of dielectric properties at the shield overlap region enables selective correction of timing skew without affecting overall cable shielding performance
2Object-affected harmful factors
If the cable shield is positioned to engage the insulator circumferentially, then shielding effectiveness is improved, but dielectric constant imbalance occurs near the overlap location
Solution Approach 1:
The patent introduces asymmetry by deliberately positioning the void to be closer to one conductor than the other, aligned with the transverse axis. This asymmetric void configuration creates a localized dielectric constant change that compensates for the imbalance caused by shield overlap, restoring symmetry in signal propagation characteristics between the differential pair
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 design minimizes signal skew imbalance by equally affecting both conductors, ensuring consistent signal transmission speeds and reducing electrical performance issues associated with air voids in conventional cables.
Implementation Method 1
The air void affects the electrical performance of the conductors in the electrical cable by changing the dielectric constant of the material near one of the conductors compared to the other of the conductors within the differential pair
Data Source
AI summary
An electrical cable includes a conductor assembly having a first conductor, a second conductor and an insulator surrounding the first conductor and the second conductor. The conductor assembly extends along a longitudinal axis for a length of the electrical cable, along a lateral axis bisecting the first and second conductors, and along a transverse axis centered between the first and second conductors. The longitudinal axis, the lateral axis and the transverse axis are mutually perpendicular axes. The insulator has an outer surface. A cable shield is wrapped around the core having an inner edge and a flap covering the inner edge. The cable shield forms a void at the inner edge. The cable shield engages the outer surface entirely circumferentially around the insulator except at the void. The void is aligned with the transverse axis.