Composite EM Wave Absorption Structure for Thin Electronics

Solution Overview

Problem

Electromagnetic interference from electronic devices poses health risks and operational disruptions, necessitating effective electromagnetic wave absorption solutions that are lightweight and suitable for thin electronic products.

Innovation Solution

An electromagnetic wave absorption structure comprising stacked conductive and insulating layers, with conductive layers made of materials like graphene, graphite, or carbon nanotubes, and insulating layers made of polymer resin or ceramic mixtures, providing a thin and efficient absorption solution.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If conventional electromagnetic wave absorption materials are used, then electromagnetic wave absorption function is achieved, but the structure becomes heavy and thick

Engineering Contradiction:

Improveelectromagnetic wave absorptionVSAvoidweight

Core Design Contradiction:

Object-affected harmful factorsVSWeight of stationary object

Solution Approach 1:

The patent employs a composite structure consisting of multiple conductive layers (graphene, graphite, carbon nanotubes) stacked with insulating layers. This composite material approach enables effective electromagnetic wave absorption while significantly reducing the overall weight compared to conventional single-material absorption structures.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent utilizes thin-film structures where each conductive layer has thickness between 5-200 nm and the total structure thickness is controlled between 5-5000 μm. This thin-film design achieves electromagnetic wave absorption functionality while minimizing weight and thickness.

Inventive Principle:

Principle #30Flexible shells and thin films

2Object-affected harmful factors

If conventional electromagnetic wave absorption materials are used, then electromagnetic wave absorption function is achieved, but the structure becomes thick

Engineering Contradiction:

Improveelectromagnetic wave absorptionVSAvoidthickness

Core Design Contradiction:

Object-affected harmful factorsVSLength of stationary object

Solution Approach 1:

The patent employs a composite structure consisting of multiple conductive layers (graphene, graphite, carbon nanotubes) stacked with insulating layers. This composite material approach enables effective electromagnetic wave absorption while significantly reducing the overall weight compared to conventional single-material absorption structures.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent utilizes thin-film structures where each conductive layer has thickness between 5-200 nm and the total structure thickness is controlled between 5-5000 μm. This thin-film design achieves electromagnetic wave absorption functionality while minimizing weight and thickness.

Inventive Principle:

Principle #30Flexible shells and thin films

3Object-affected harmful factors

If multiple conductive layers are stacked to improve absorption, then electromagnetic wave absorption function is enhanced, but device complexity increases

Engineering Contradiction:

Improveelectromagnetic wave absorptionVSAvoidstructure complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent divides the electromagnetic wave absorption structure into multiple discrete conductive layers (graphene, graphite, carbon nanotubes) separated by insulating layers. This segmentation allows each layer to contribute differently to wave absorption, enhancing overall effectiveness while maintaining manageable structural complexity through modular design.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent employs a composite structure consisting of multiple conductive layers (graphene, graphite, carbon nanotubes) stacked with insulating layers. This composite material approach enables effective electromagnetic wave absorption while significantly reducing the overall weight compared to conventional single-material absorption structures.

Inventive Principle:

Principle #40Composite materials

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 structure effectively absorbs electromagnetic waves, reducing interference and health risks while meeting the form factor requirements of thin electronic devices.

Implementation Method 1

The conductive layer is a graphene layer, a graphite layer, a graphite nanoplatelet layer, a carbon fiber layer, or a carbon nanotube layer

Methodology Applied

Scientific EffectElectrical conductivity: Conduction (electrical)

Implementation Method 2

the electromagnetic wave absorption structure and electronic device having the same can provide good electromagnetic wave absorption function

Methodology Applied

Scientific EffectElectromagnetic energy absorption: Absorption (EM radiation)

Implementation Method 3

The insulating layer or the interlayer insulating layer is a polymer resin layer, a resin/ceramic mixture layer, or a resin/metal mixture layer

Methodology Applied

Scientific EffectElectrical insulation: Dielectric

Data Source

PatentUS12477708B2Electromagnetic wave absorption structure

Publication Date: 2025.11.18 BLACK SOLUTION NANOTECH CO LTD

AI summary

An electromagnetic wave absorption structure includes at least two electromagnetic wave composite absorbing layers stacked and overlapped with each other. Each of the electromagnetic wave composite absorbing layers comprises a conductive composite layer and an insulating layer, and the insulating layer is stacked and overlapped with the conductive composite layer. The conductive composite layer comprises a plurality of conductive layers and a plurality of interlayer insulating layers, and the conductive layers and the interlayer insulating layers are stacked in a staggered manner. The ratio of a thickness of one of the plurality of insulating layers to a thickness of one of the plurality of interlayer insulating layers is greater than or equal to 20.