18H Hexaferrite Composite for Low-Loss GHz Magnetic Performance
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Solution Overview
Problem
There is a need for ferrite materials with low magnetic loss, high magnetic permeability, and low dielectric loss in the gigahertz range to meet the demands of ultrahigh frequency applications, particularly in radar and wireless communication systems, where existing ferrite materials exhibit high magnetic loss at high frequencies.
Innovation Solution
A polycrystalline ferrite composition with a formula of M5Me2Ti3Fe12O31, where M is Ba2+, Sr2+, and Me is Mg2+, Zn2+, Cu2+, or a combination thereof, is developed with an average grain size of 1 micrometer to 100 micrometers, combined with a polymer matrix to form a composite, using a manufacturing process involving calcining, reducing particle size, granulating, and sintering to achieve low magnetic loss and high permeability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional ferrite materials are used, then manufacturing cost is reduced, but magnetic loss increases at high frequencies
Solution Approach 1:
The patent changes the chemical composition parameters by using specific ratios of Ba, Sr, Mg, Zn, Ti, and Fe elements in the M5Me2Ti3Fe12O31 formula, along with controlling grain size parameters through sintering temperature and time, to achieve low magnetic loss at high frequencies while maintaining cost-effectiveness through conventional materials
Solution Approach 2:
The patent creates a composite ferrite material combining multiple metal elements (Ba, Sr, Mg, Zn, Ti, Fe) in specific proportions to achieve synergistic effects that reduce magnetic loss while maintaining manufacturing feasibility and cost-effectiveness
2Loss of energy
If ferrite material grain size is reduced, then magnetic permeability increases, but manufacturing precision requirements increase
Solution Approach 1:
The patent optimizes sintering parameters (temperature range 900-1300°C, time 1-24 hours) to control grain growth and achieve the desired grain size range of 1-100 micrometers, balancing magnetic permeability improvement with manufacturability
Solution Approach 2:
The patent performs preliminary particle size reduction of metal source compounds to 0.5-10 micrometers before sintering to ensure uniform grain growth and achieve the target grain size range, facilitating better control over final magnetic properties
3Loss of energy
If ferrite material is optimized for high frequency performance, then magnetic loss decreases, but dielectric loss increases
Solution Approach 1:
The patent adjusts the chemical composition parameters (ratios of Ba, Sr, Mg, Zn, Ti, Fe) and grain size parameters to simultaneously optimize both magnetic and dielectric properties, achieving low magnetic loss while controlling dielectric loss through compositional tuning
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 resulting composite exhibits low magnetic loss tangent, high magnetic permeability, and low dielectric loss, making it suitable for applications such as antenna substrates and EMI suppressors over a wide frequency range (0.5-10 GHz), while being cost-effective without the use of rare earth or noble elements.
Implementation Method 1
polycrystalline ferrite composition... high magnetic permeability... low magnetic loss tangent
Implementation Method 2
low dielectric loss... dielectric loss tangent
Data Source
AI summary
A polycrystalline ferrite composition comprises a formula of M5Me2Ti3Fe12O31, wherein M is Ba2+, Sr2+, or a combination thereof; and Me is Mg2+, Zn2+, Cu2+, Co2+, or a combination thereof; and has an average grain size of 1 micrometer to 100 micrometers. A composite comprises a polymer matrix; and the polycrystalline ferrite composition. Methods of making the polycrystalline ferrite composition and the composite are also disclosed.