Nanoparticle Composite Material for High-Frequency Antenna Devices
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Solution Overview
Problem
Current magnetic materials fail to provide high magnetic permeability and low magnetic loss at high frequencies, particularly in the gigahertz band, making them unsuitable for high-frequency applications such as antenna devices and electromagnetic wave absorbers.
Innovation Solution
A nanoparticle composite material with metal nanoparticles of specific dimensions and aspect ratios, combined with a binder and non-magnetic metals, is developed to enhance magnetic permeability and reduce eddy current loss, allowing for the creation of thick-film materials with improved high-frequency characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnetic materials are used for high-frequency devices, then magnetic permeability is required, but magnetic loss increases at high frequencies
Solution Approach 1:
The patent divides magnetic material into nanoparticle aggregates with controlled sizes (0.2-2.0 μm) and aspect ratios (3-10), creating segmented structures that reduce eddy current paths while maintaining magnetic permeability. This segmentation allows the material to achieve both high magnetic permeability and low magnetic loss at high frequencies by breaking down continuous magnetic domains into discrete nanoparticle units.
Solution Approach 2:
The patent creates composite materials by combining magnetic nanoparticle aggregates with resin matrices and optional non-magnetic metal particles. This composite structure allows the magnetic nanoparticles to provide permeability while the resin matrix provides insulation to reduce eddy current losses, achieving both high magnetic permeability and low magnetic loss simultaneously.
2Reliability
If thick-film materials are used for antenna boards, then magnetic permeability can be improved, but eddy current loss increases
Solution Approach 1:
The patent segments thick films into multiple layers of nanoparticle aggregates (each layer 1-100 μm thick) with resin matrices in between. This segmentation breaks down eddy current paths into smaller segments, reducing overall eddy current loss while maintaining the total thickness and magnetic permeability needed for antenna board applications.
Solution Approach 2:
The patent introduces resin matrices as intermediary layers between magnetic nanoparticle aggregates in thick-film structures. These resin layers act as electrical insulators that interrupt eddy current paths, allowing thick films to maintain high magnetic permeability while significantly reducing eddy current losses through the insulating barrier effect.
3Reliability
If flat magnetic particles are used, then magnetic permeability at low frequency improves, but eddy current loss increases at high frequency
Solution Approach 1:
The patent segments flat magnetic particles into nanoparticle aggregates with controlled size ranges (0.2-2.0 μm) and aspect ratios (3-10). This segmentation reduces the effective thickness of magnetic domains while maintaining the aspect ratio needed for low-frequency permeability, thereby reducing eddy current paths available for high-frequency losses.
Solution Approach 2:
The patent changes the size parameters of magnetic particles from conventional large flat particles to controlled nanoparticle aggregates with specific size ranges (0.2-2.0 μm) and aspect ratios (3-10). This parameter change optimizes the balance between maintaining low-frequency magnetic permeability and reducing high-frequency eddy current losses by controlling the scale of magnetic domains.
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 nanoparticle composite material achieves high magnetic permeability and low transmission loss, suitable for high-frequency applications, while maintaining thermal stability and oxidation resistance, enabling effective use in antenna devices and electromagnetic wave absorbers.
Implementation Method 1
nanoparticle aggregates including metal nanoparticles having an average diameter of 1 nm or more and 20 nm or less and containing at least one magnetic metals selected from the group consisting of Fe, Co and Ni
Implementation Method 2
achieves high magnetic permeability and low transmission loss, suitable for high-frequency applications
Data Source
AI summary
According to one embodiment, there is provided a nanoparticle composite material, including nanoparticle aggregates in a shape having an average height of 20 nm or more and 2 μm or less and having an average aspect ratio of 5 or more, the nanoparticle aggregates including metal nanoparticles having an average diameter of 1 nm or more and 20 nm or less and containing at least one magnetic metals selected from the group consisting of Fe, Co and Ni and binder existing between the nanoparticle aggregates.