Graphene Passive Layer for Near-Field EMI Attenuation and Heat Dissipation

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Conventional shielding techniques are inadequate for suppressing near-field electromagnetic noise interference in high-frequency, miniaturized electronic devices, as they either reflect or absorb noise, leading to signal reduction and malfunction, and existing passive elements are insufficient for wide-frequency noise reduction and heat dissipation.

Innovation Solution

A passive layer using graphene for near-field electromagnetic wave attenuation and heat dissipation, integrated with low dielectric constant layers in a multilayer composite structure, applied as a thin film on electronic devices to effectively absorb electromagnetic waves and dissipate heat.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If conventional shielding materials are used to absorb electromagnetic waves, then electromagnetic wave blocking is achieved, but heat dissipation capability is insufficient for high-integration devices

Engineering Contradiction:

Improveelectromagnetic wave absorptionVSAvoidheat dissipation

Core Design Contradiction:

Object-affected harmful factorsVSTemperature

Solution Approach 1:

Graphene serves multiple functions simultaneously: it absorbs electromagnetic waves through its high electrical conductivity while also providing superior heat dissipation through its exceptional thermal conductivity. This multi-functionality resolves the contradiction between electromagnetic wave absorption and heat dissipation requirements in high-integration devices

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Object-affected harmful factors

If passive elements (inductance components, capacitance components) are added for noise filtering, then noise attenuation is achieved, but device miniaturization and slimness are compromised

Engineering Contradiction:

Improvenoise attenuationVSAvoiddevice size

Core Design Contradiction:

Object-affected harmful factorsVSVolume of moving object

Solution Approach 1:

The patent replaces traditional mechanical/passive filtering elements (inductors, capacitors) with a graphene-based material solution that provides noise attenuation through its intrinsic material properties. This substitution eliminates the need for separate passive components, enabling device miniaturization while maintaining noise filtering functionality

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent uses thin film structures of graphene to achieve noise attenuation without adding significant volume. The flexible thin film can be integrated into device structures with minimal thickness, preserving device slimness and compactness while providing effective noise filtering across wide frequency ranges

Inventive Principle:

Principle #30Flexible shells and thin films

3Object-affected harmful factors

If ferrite or soft magnetic materials are used for electromagnetic wave suppression, then magnetic loss-based noise reduction is achieved, but frequency characteristics deteriorate at RF and semi-microwave bands

Engineering Contradiction:

Improvenoise reduction effectVSAvoidfrequency characteristics

Core Design Contradiction:

Object-affected harmful factorsVSAdaptability or versatility

Solution Approach 1:

The patent changes the material parameter from magnetic loss-based mechanisms (ferrite/soft magnetic materials) to electrical conductivity-based mechanisms (graphene). Graphene's high electrical conductivity and carrier mobility enable effective noise attenuation at RF and semi-microwave frequencies where magnetic materials exhibit deteriorated frequency characteristics, thus resolving the adaptability issue across different frequency bands

Inventive Principle:

Principle #35Parameter changes

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 graphene-based passive layer achieves significant noise reduction and heat dissipation across a wide frequency range, enabling slim, high-integration electronic devices with improved thermal conductivity and transparency, overcoming limitations of conventional materials.

Implementation Method 1

graphene has high electromagnetic wave attenuation performance... high electrical conductivity

Methodology Applied

Scientific EffectElectrical conductivity: Conduction (electrical)

Implementation Method 2

effectively absorb electromagnetic waves... noise reduction effect

Methodology Applied

Scientific EffectElectromagnetic wave absorption: Absorption (EM radiation)

Implementation Method 3

graphene has... high thermal conductivity... heat dissipation

Methodology Applied

Scientific EffectThermal conductivity: Conduction (thermal)

Data Source

PatentUS9924619B2Passive layer for attenuation of near-field electromagnetic waves and heatdissipation including graphene, and electromagnetic device including the same

Publication Date: 2018.03.20 KOREA INST OF SCI & TECH

AI summary

The present invention relates to a passive layer including graphene for the attenuation of near-field electromagnetic waves and heat dissipation. The passive layer blocks electromagnetic waves radiated from an external electronic device or prevents electromagnetic waves generated in an electronic device from emitting to the outside. The passive layer is designed to reduce interference between transmission circuits of a device in the near-field region or influence such as malfunction caused by external electromagnetic waves. The present invention also relates to an electromagnetic device and a circuit board, each including the passive layer.