Shielded Conductive Path With Composite Layering

Solution Overview

Problem

Conventional shielding members require increased cross-sectional area to achieve high shielding functionality across a broad frequency band, leading to increased weight, size, and cost.

Innovation Solution

A shielded conductive path with a layered configuration of a conductive layer and a magnetic layer, where the conductive layer blocks electromagnetic noise in the low to intermediate frequency band and the magnetic layer blocks noise in the intermediate to high frequency band, allowing for a smaller cross-sectional area without compromising shielding effectiveness.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the cross-sectional area of the shielding member is increased to achieve high shielding function over a broad frequency band, then the shielding effectiveness is improved, but the weight, size, and cost of the shielding member increase

Engineering Contradiction:

Improveshielding effectivenessVSAvoidweight of shielding member

Core Design Contradiction:

ReliabilityVSWeight of stationary object

Solution Approach 1:

The shielding member is constructed as a composite structure with a conductive layer and a magnetic layer having different magnetic permeabilities. The conductive layer primarily shields low-frequency electromagnetic noise through eddy current effects, while the magnetic layer shields high-frequency noise through magnetic permeability. This composite material approach enables broad frequency band shielding without increasing the cross-sectional area, thereby reducing weight while maintaining shielding effectiveness.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

Different layers of the shielding member are assigned different material properties tailored to specific frequency ranges. The conductive layer is optimized for low-frequency shielding with high electrical conductivity, while the magnetic layer is optimized for high-frequency shielding with appropriate magnetic permeability. This local differentiation of material qualities allows each layer to efficiently handle its designated frequency range, achieving comprehensive shielding with minimal overall thickness.

Inventive Principle:

Principle #3Local quality

2Reliability

If the cross-sectional area of the shielding member is increased to achieve high shielding function over a broad frequency band, then the shielding effectiveness is improved, but the size of the shielding member increases

Engineering Contradiction:

Improveshielding effectivenessVSAvoidcross-sectional area of shielding member

Core Design Contradiction:

ReliabilityVSArea of stationary object

Solution Approach 1:

The shielding member is constructed as a composite structure with a conductive layer and a magnetic layer having different magnetic permeabilities. The conductive layer primarily shields low-frequency electromagnetic noise through eddy current effects, while the magnetic layer shields high-frequency noise through magnetic permeability. This composite material approach enables broad frequency band shielding without increasing the cross-sectional area, thereby reducing weight while maintaining shielding effectiveness.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

Different layers of the shielding member are assigned different material properties tailored to specific frequency ranges. The conductive layer is optimized for low-frequency shielding with high electrical conductivity, while the magnetic layer is optimized for high-frequency shielding with appropriate magnetic permeability. This local differentiation of material qualities allows each layer to efficiently handle its designated frequency range, achieving comprehensive shielding with minimal overall thickness.

Inventive Principle:

Principle #3Local quality

3Reliability

If the cross-sectional area of the shielding member is increased to achieve high shielding function over a broad frequency band, then the shielding effectiveness is improved, but the cost of the shielding member increases

Engineering Contradiction:

Improveshielding effectivenessVSAvoidcost of shielding member

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The shielding member is constructed as a composite structure with a conductive layer and a magnetic layer having different magnetic permeabilities. The conductive layer primarily shields low-frequency electromagnetic noise through eddy current effects, while the magnetic layer shields high-frequency noise through magnetic permeability. This composite material approach enables broad frequency band shielding without increasing the cross-sectional area, thereby reducing weight while maintaining shielding effectiveness.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

Different layers of the shielding member are assigned different material properties tailored to specific frequency ranges. The conductive layer is optimized for low-frequency shielding with high electrical conductivity, while the magnetic layer is optimized for high-frequency shielding with appropriate magnetic permeability. This local differentiation of material qualities allows each layer to efficiently handle its designated frequency range, achieving comprehensive shielding with minimal overall thickness.

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

This configuration enables effective shielding over a broad frequency band with reduced material usage, maintaining performance while minimizing weight and cost.

Implementation Method 1

electromagnetic noise in a frequency band between a low frequency and an intermediate frequency can be blocked with the conductive layer

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Implementation Method 2

electromagnetic noise in a frequency band between a low frequency and an intermediate frequency can be blocked with the conductive layer

Methodology Applied

Scientific EffectEddy currents: Eddy Currents

Implementation Method 3

electromagnetic noise in a frequency band between an intermediate frequency and a high frequency can be blocked with the magnetic layer

Methodology Applied

Scientific EffectMagnetic shielding: Magnetic Field

Data Source

PatentUS10176906B2Shielded conductive path

Publication Date: 2019.01.08 AUTONETWORKS TECH LTD

AI summary

Provided is a shielded conductive path exhibiting a shielding function over a broad frequency band between a low frequency and a high frequency even when the shielding member has a small cross-sectional area. A shielded conductive path includes conductive path main bodies, insulating layers surrounding the conductive path main bodies, and shielding members facing the outer circumferential surfaces of the insulating layers, each have a configuration in which a conductive layer and a magnetic layer are layered together. Electromagnetic noise in a frequency band between a low frequency and an intermediate frequency is blocked with the conductive layer, and electromagnetic noise in a frequency band between an intermediate frequency and a high frequency is blocked with the magnetic layer. The different frequency regions are assigned to the conductive layer and the magnetic layer, and therefore, the cross-sectional areas of the conductive layer and the magnetic layer need not be increased.