Aperiodic Spiral Cable Shield Resonance Control
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Solution Overview
Problem
Conventional spiral-wrapped cable shields in information handling systems experience signal integrity issues due to periodic return path discontinuities, leading to resonance effects and signal attenuation at high-speed signal transmission frequencies, and eliminating these issues with uniform cable shields is costly.
Innovation Solution
An aperiodic spiral-wrapped cable shield system with varying wrap pitch and overlap areas, creating a plurality of varying LC circuits that do not exceed the signal integrity resonance threshold, thereby preventing signal attenuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a uniform cable shield is provided along the entire length of the cable, then signal integrity is improved by eliminating resonance effects, but the cost increases exponentially with the length of the cable
Solution Approach 1:
The cable shield is segmented into multiple discrete sections rather than providing continuous uniform shielding. Each section is positioned at specific locations along the cable where resonance issues are most critical, allowing the cable to maintain signal integrity at key points while reducing overall material usage and cost.
Solution Approach 2:
Instead of uniform shielding throughout the entire cable, the invention applies shielding with varying characteristics at different locations. The shield sections have different positions, orientations, and coverage areas tailored to address specific resonance problems at those locations, optimizing performance while minimizing cost.
2Ease of manufacture
If spiral wrapping of cable shield is used, then manufacturing cost is reduced compared to uniform shielding, but resonance effects and signal attenuation occur at high-speed transmission frequencies
Solution Approach 1:
The cable shield sections are positioned asymmetrically rather than in a regular periodic pattern. The distances between successive shield sections vary, breaking the symmetry that causes resonant reinforcement at specific frequencies. This asymmetric arrangement prevents the buildup of resonance effects while maintaining the cost benefits of segmented shielding.
Solution Approach 2:
The invention uses periodic placement of shield sections but varies the period (spacing distance) between sections along the cable length. This controlled periodicity with varying intervals disrupts the formation of standing waves and resonance at problematic frequencies, while still providing sufficient shielding coverage to maintain signal integrity.
3Reliability
If cable shield overlaps are eliminated to prevent resonance effects, then signal attenuation is reduced, but signal radiation and discontinuities in the current return path are introduced
Solution Approach 1:
The cable shield sections act as intermediary elements that bridge the conductors and ground reference. By providing discrete shielding sections at strategic locations, the invention creates intermediate reference planes that guide return currents and reduce radiation, while the gaps between sections are designed to minimize discontinuity effects.
Solution Approach 2:
The cable shield configuration transitions from static continuous shielding to dynamic segmented shielding where the presence and characteristics of shield sections vary along the cable length. This dynamic approach allows the shield to adapt to different signal frequency requirements and transmission conditions, optimizing performance while reducing harmful radiation effects.
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 aperiodic spiral-wrapped cable shield system effectively reduces resonance effects, allowing for high-speed signal transmission without signal losses, while maintaining a cost-effective solution by avoiding the exponential cost increase of uniform cable shields.
Implementation Method 1
the varying overlap areas of the plurality of overlapping cable shield portions create a plurality of varying LC circuits that are configured to generate a resonance that does not exceed a signal integrity resonance threshold for the signals
Data Source
AI summary
An aperiodically overlapping spiral-wrapped cable shield system includes a cable having cable components such as a pair of conductors, at least one insulator surrounding the pair of conductors, and at least one drain wire. The cable also includes a cable shield that is spirally wrapped around the cable components with a varying wrap pitch that provides a plurality of overlapping cable shield portions with varying overlap areas. When signals are transmitted using the cable components in the cable, the varying overlap areas of the plurality of overlapping cable shield portions create a plurality of varying LC circuits that are configured to generate a resonance that does not exceed a signal integrity resonance threshold for a signals.