Communication Cable Segmented Shield for EMI Reduction

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Solution Overview

Problem

Existing communication cables face challenges with noise, interference, and crosstalk, particularly with continuous shields that can create electrical paths and interfere with signals, posing safety hazards and affecting signal quality at higher data rates.

Innovation Solution

A communication cable design featuring a segmented tape with electrically conductive patches on a dielectric substrate, providing a discontinuous shield that isolates electricity flow between ends, reducing electromagnetic interference and crosstalk while maintaining signal integrity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If a continuous shield is used to shield the cable, then electromagnetic interference and crosstalk are reduced, but an electrical path is created between cable ends causing safety hazards and signal interference

Engineering Contradiction:

Improveelectromagnetic interferenceVSAvoidsafety hazard

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The continuous shield is divided into multiple discrete conductive patches separated by insulating material. Each patch provides localized electromagnetic shielding while the insulating barriers between patches prevent electrical continuity along the cable length, eliminating shock hazards and ground loops.

Inventive Principle:

Principle #1Segmentation

2Object-affected harmful factors

If a continuous shield is used to shield the cable, then crosstalk between adjacent cables is reduced, but standing waves of electromagnetic energy are created that can radiate interference

Engineering Contradiction:

ImprovecrosstalkVSAvoidelectromagnetic radiation

Core Design Contradiction:

Object-affected harmful factorsVSObject-generated harmful factors

Solution Approach 1:

The shield is segmented into discrete patches that maintain electromagnetic shielding effectiveness for reducing crosstalk while breaking the continuous conductive path that would support standing waves and electromagnetic radiation, thus eliminating the antenna effect.

Inventive Principle:

Principle #1Segmentation

3Reliability

If a continuous shield is used to shield the cable, then signal fidelity is improved, but manufacturing complexity and installation difficulty increase

Engineering Contradiction:

Improvesignal fidelityVSAvoidshield structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The shield comprises thin flexible conductive patches laminated onto or embedded in the cable insulation. This thin-film approach maintains effective electromagnetic shielding for signal fidelity while being far simpler to manufacture and install than rigid continuous shield structures.

Inventive Principle:

Principle #30Flexible shells and thin films

4Object-affected harmful factors

If a continuous shield is used to shield the cable, then electromagnetic shielding effectiveness is improved, but cost increases

Engineering Contradiction:

Improveelectromagnetic shielding effectivenessVSAvoidmanufacturing cost

Core Design Contradiction:

Object-affected harmful factorsVSEase of manufacture

Solution Approach 1:

The segmented shield structure uses smaller amounts of conductive material compared to continuous shields, reducing material costs. The discrete patches can be applied through simpler manufacturing processes such as lamination or embedding, lowering overall manufacturing complexity and cost while maintaining shielding effectiveness.

Inventive Principle:

Principle #1Segmentation

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 solution effectively suppresses noise and interference, supports high-speed data transmission without creating an electrical path between cable ends, enhancing signal fidelity and safety by preventing shock hazards and reducing electromagnetic interference.

Implementation Method 1

a narrow strip or ribbon of dielectric or electrically insulating material

Methodology Applied

Scientific EffectElectrical insulation: Dielectric

Implementation Method 2

Electrically conductive patches can be disposed against or adjacent at least one side of the tape... The patches can comprise aluminum, copper, a metallic substance, or some other appropriate material that readily conducts electricity

Methodology Applied

Scientific EffectElectromagnetic shielding: Faraday Cage

Data Source

PatentUS8119907B1Communication cable with electrically isolated shield comprising holes

Publication Date: 2012.02.21 SUPERIOR ESSEX INT INC

AI summary

A shield for a communication cable can comprise a narrow substrate of electrically insulating material extending lengthwise along the cable. Patches of electrically conductive material can be disposed on, in, or adjacent the substrate, with the patches electrically isolated from one another. The substrate can comprise holes, apertures, openings, and/or areas in which substrate material has been eliminated, reduced, thinned, or removed. Reducing substrate material can benefit the communication cable, for example imparting the cable with an improved burn, flammability, or smoke characteristic or performance rating/score, for example. The resulting cable can comprise a shield that is electrically discontinuous between opposite ends of the cable.