Metamaterial EM Absorber Resonance Structure for Lightweight Shielding

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Conventional electromagnetic absorbers or shielding agents used in electric vehicle battery wireless charging systems are heavy and expensive, and they either reduce the magnetic field intensity or fail to maintain electromagnetic shielding performance effectively.

Innovation Solution

A metamaterial electromagnetic absorber is developed, comprising a substrate made of a metamaterial such as glass-reinforced epoxy laminate or FR4, with first and second inductive conduction patterns on opposite surfaces, and a conductive plate grounded, forming a resonance circuit to achieve effective electromagnetic shielding.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If ferrite and aluminum are used to manufacture electromagnetic absorber, then electromagnetic shielding performance is maintained, but weight and manufacturing cost increase

Engineering Contradiction:

Improveelectromagnetic shielding performanceVSAvoidweight

Core Design Contradiction:

ReliabilityVSWeight of stationary object

Solution Approach 1:

The patent changes the material parameters from conventional ferrite and aluminum to metamaterials with specific electromagnetic properties. The metamaterial substrate is designed with particular permittivity and permeability characteristics that enable effective electromagnetic wave absorption at lower weights, directly resolving the contradiction between shielding performance and weight

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs composite metamaterial structures combining dielectric and magnetic components in a layered configuration. This composite approach achieves superior electromagnetic shielding performance through synergistic effects while maintaining reduced weight compared to solid ferrite-aluminum constructions

Inventive Principle:

Principle #40Composite materials

2Reliability

If aluminum alone is used for electromagnetic shielding, then electromagnetic waves are shielded, but magnetic field intensity is reduced

Engineering Contradiction:

Improveelectromagnetic shielding performanceVSAvoidmagnetic field intensity

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent applies local quality by designing specific regions of the metamaterial absorber with tailored electromagnetic properties. The structure includes varying thicknesses and material compositions in different zones to selectively absorb electromagnetic waves while preserving magnetic field intensity in critical areas, avoiding the uniform reduction caused by aluminum alone

Inventive Principle:

Principle #3Local quality

3Reliability

If ferrite and aluminum are used to manufacture electromagnetic absorber, then electromagnetic shielding performance is maintained, but manufacturing cost increases

Engineering Contradiction:

Improveelectromagnetic shielding performanceVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent replaces expensive ferrite materials with more cost-effective metamaterial substrates that can be manufactured using standard PCB fabrication techniques. The design allows for the use of conventional materials like FR4 or Rogers substrates combined with thin metallic layers, significantly reducing material costs while maintaining shielding performance

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The patent substitutes complex mechanical assembly of ferrite and aluminum components with integrated metamaterial structures that can be manufactured as single-piece printed circuit boards. This eliminates costly assembly processes and reduces manufacturing complexity, directly addressing the cost contradiction

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 metamaterial electromagnetic absorber achieves high electromagnetic absorptivity, maintaining performance equivalent to conventional shielding agents while reducing weight and manufacturing costs, using inexpensive materials like FR4 and copper.

Implementation Method 1

the first inductive conduction pattern and the second inductive conduction pattern may be electrically connected to each other to form a resonance circuit

Methodology Applied

Scientific EffectResonance: Resonance

Implementation Method 2

an electromagnetic absorber is a device that absorbs electromagnetic waves incident on the surface thereof so as to be consumed as heat

Methodology Applied

Scientific EffectElectromagnetic absorption: Absorption (EM radiation)

Implementation Method 3

An electromagnetic shielding agent manufactured using aluminum alone shields electromagnetic waves using an eddy current

Methodology Applied

Scientific EffectEddy current: Eddy Currents

Data Source

PatentUS12289823B2Metamaterial electromagnetic absorber

Publication Date: 2025.04.29 HYUNDAI MOTOR CO LTD

AI summary

A metamaterial electromagnetic absorber includes a substrate having a first surface on which electromagnetic waves are incident and a second surface opposite the first surface. The substrate is made of a metamaterial. The metamaterial electromagnetic absorber also includes a first inductive conduction pattern and a second inductive conduction pattern formed on the first surface and the second surface, respectively.