Hexagonal Ferrite Radio Wave Absorber Attenuation
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Solution Overview
Problem
Conventional radio wave absorbers with magnetic powders and binders face challenges in simultaneously increasing both transmission and reflection attenuation amounts, which are essential for improving radar recognition accuracy, as enhancing one often decreases the other.
Innovation Solution
A radio wave absorber comprising a magnetic powder of hexagonal ferrite with a saturation magnetization to half-width ratio (σs/β) of 240 emu·g−1·degree−1 or more, determined by X-ray diffraction analysis, is used, allowing for increased transmission and reflection attenuation without the need for a metal layer on the back surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If metal layer is added on back surface to improve reflection attenuation, then reflection attenuation amount is improved, but device complexity increases
Solution Approach 1:
The patent extracts and eliminates the metal layer component from the conventional radio wave absorber structure. By optimizing the magnetic properties of the hexagonal ferrite powder (σs/β ≥ 240 emu·g−1·degree−1), the invention achieves high reflection attenuation without requiring the additional metal layer, thereby simplifying the overall structure.
Solution Approach 2:
The hexagonal ferrite magnetic powder with optimized magnetic properties serves multiple functions simultaneously: it provides both transmission attenuation through magnetic loss mechanisms and reflection attenuation through enhanced magnetic resonance effects, replacing the need for separate metal layer components.
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
This approach enhances both transmission and reflection attenuation amounts, thereby improving radar recognition accuracy by increasing the directivity and selectivity of radar systems without deteriorating the quality or increasing costs.
Implementation Method 1
a radio wave absorber comprising a magnetic powder and a binder, in which the magnetic powder is a powder of a hexagonal ferrite in which a ratio (σs/β) of a saturation magnetization as to a half-width β of a diffraction peak on a (107) plane is 240 emu·g−1·degree−1 or more
Implementation Method 2
where the half-width β is determined by X-ray diffraction analysis
Data Source
AI summary
A radio wave absorber including a magnetic powder and a binder, in which the magnetic powder is a powder of a hexagonal ferrite in which a ratio (σs/β) of a saturation magnetization as to a half-width β of a diffraction peak on a (107) plane is 240 emu·g−1·degree−1 or more, where the half-width β is determined by X-ray diffraction analysis.