Transmission EM Wave Absorber With Low-Reflection Iron Oxide Layer
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Solution Overview
Problem
Existing electromagnetic-wave absorbers for high-frequency bands above the millimeter-wave band struggle to effectively absorb electromagnetic waves while minimizing surface reflection, limiting their flexibility and shape adaptability.
Innovation Solution
A transmission-type electromagnetic-wave absorber with a magnetic iron oxide layer that magnetically resonates at high frequencies, combined with a binder containing an organic material, maintaining a real part of complex relative permittivity at 5.5 or less at 1 GHz to reduce surface reflection and enhance absorption efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a magnetic iron oxide layer is used to absorb high-frequency electromagnetic waves, then absorption efficiency is improved, but surface reflection increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the real part of complex relative permittivity to be 5.5 or less at 1 GHz. This parameter optimization creates impedance matching between the absorber and free space, minimizing reflection while maintaining effective absorption of high-frequency electromagnetic waves through magnetic resonance of the iron oxide particles.
Solution Approach 2:
The patent uses composite materials by combining magnetic iron oxide particles with a binder containing organic material. This composite structure enables both magnetic resonance for absorption and controlled permittivity for reduced reflection, achieving dual functionality in a single integrated absorber layer.
2Adaptability or versatility
If a transmission-type absorber is used instead of reflection-type, then flexibility and shape adaptability are improved, but electromagnetic wave absorption capability may be reduced
Solution Approach 1:
The patent achieves both transmission-type flexibility and effective absorption by optimizing the real part of complex relative permittivity to 5.5 or less. This parameter control enables impedance matching that reduces reflection while the magnetic iron oxide provides strong absorption through magnetic resonance, allowing the absorber to function effectively without rigid shielding structures.
Solution Approach 2:
The composite of magnetic iron oxide particles with organic binder material creates a transmission-type absorber that combines the magnetic resonance absorption mechanism with a flexible, shapeable matrix. This composite structure enables both high shape adaptability and effective electromagnetic wave absorption capability.
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 solution effectively absorbs high-frequency electromagnetic waves by converting them into heat and reduces surface reflection, allowing for flexible and shape-adaptive electromagnetic-wave absorbers that can be efficiently used in various applications.
Implementation Method 1
an electromagnetic-wave absorbing layer containing a magnetic iron oxide that magnetically resonates at a frequency in or above a millimeter-wave band
Implementation Method 2
The real part of the complex relative permittivity of the electromagnetic-wave absorber is 5.5 or less at 1 GHz
Data Source
AI summary
To provide a transmission-type electromagnetic-wave absorber that can satisfactorily absorb electromagnetic waves of high frequencies in or above the millimeter wave band while reducing the reflection of electromagnetic waves on the surface of the absorber. The transmission-type electromagnetic-wave absorber includes an electromagnetic-wave absorbing layer 1 containing a magnetic iron oxide 1a that magnetically resonates at a frequency in or above the millimeter-wave band and a binder 1b containing an organic material. The real part of the complex relative permittivity of the electromagnetic-wave absorber is 5.5 or less at 1 GHz.