Twisted Pair Cable With Nested Grounded Conductor

Solution Overview

Problem

Cables with poor signal integrity often suffer from electromagnetic interference (EMI) or radio frequency interference (RFI), which can be costly to mitigate with additional filters or thicker shielding layers, reducing usable space and increasing production time in electronic devices.

Innovation Solution

A cable design featuring a twisted pair with a conducting element disposed between the signal wires, grounded to a metal layer or housing, filters common mode signals while preserving differential mode signals, thereby enhancing signal integrity and reducing EMI/RFI.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If additional filters or thicker shielding layers are added to the cable, then signal integrity is improved, but device space is reduced and production cost increases

Engineering Contradiction:

Improvesignal integrityVSAvoiddevice space

Core Design Contradiction:

ReliabilityVSVolume of stationary object

Solution Approach 1:

The conducting element is nested within the twisted pair structure, with the main body portion positioned between the two signal wires and surrounded by them. This nested configuration allows the EMI filtering function to be integrated into the existing cable structure without requiring additional external space, thereby resolving the contradiction between improving signal integrity and maintaining device space.

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The patent merges the EMI filtering function with the existing twisted pair cable structure by incorporating a conducting element that is grounded through extending portions. This combines the signal transmission function of the twisted pair with the EMI shielding function of the conducting element, eliminating the need for separate filters or thicker shielding layers while maintaining signal integrity.

Inventive Principle:

Principle #5Merging (Combining)

2Reliability

If additional filters or thicker shielding layers are added to the cable, then signal integrity is improved, but production cost and time increase

Engineering Contradiction:

Improvesignal integrityVSAvoidproduction cost and time

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent merges the EMI filtering function with the existing twisted pair cable structure by incorporating a conducting element that is grounded through extending portions. This combines the signal transmission function of the twisted pair with the EMI shielding function of the conducting element, eliminating the need for separate filters or thicker shielding layers while maintaining signal integrity.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The conducting element serves multiple functions: it acts as an EMI shield by being grounded through the extending portions, and simultaneously maintains the structural integrity of the twisted pair. This multi-functionality reduces the need for additional components, thereby lowering production cost and time while improving signal integrity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Reliability

If a conducting element is added to filter common mode signals, then signal integrity is improved, but cable structure complexity increases

Engineering Contradiction:

Improvesignal integrityVSAvoidcable structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The conducting element is nested within the twisted pair structure, with the main body portion positioned between the two signal wires and surrounded by them. This nested configuration allows the EMI filtering function to be integrated into the existing cable structure without requiring additional external space, thereby resolving the contradiction between improving signal integrity and maintaining device space.

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The conducting element is strategically positioned only where needed - between the two signal wires of the twisted pair - rather than requiring comprehensive shielding throughout the entire cable. This localized approach provides effective EMI filtering at the critical interface while minimizing overall structural complexity.

Inventive Principle:

Principle #3Local quality

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 cable design effectively filters common mode signals, improving signal integrity and reducing EMI/RFI without the need for additional filters or thicker shielding, thus maintaining device space and reducing production costs.

Implementation Method 1

the conducting element is disposed between the two signal wires of the twisted pair, and the conducting element is grounded. Accordingly, the conducting element can filter a common mode signal of the twisted pair

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Data Source

PatentUS9786414B2Cable

Publication Date: 2017.10.10 WISTRON CORP

AI summary

A cable including a first insulating layer, a twisted pair, a ground structure, and at least one conducting element is provided. The twisted pair is disposed in the first insulating layer and includes two signal wires, wherein the two signal wires are intertwisted to each other. The ground structure is disposed at the first insulating layer. The conducting element includes a main body portion and at least one extending portion. The main body portion is disposed in the twisted pair to be surrounded by the two signal wires. The extending portion is connected to the main body portion and grounded to the ground structure.