Composite Radio Wave Absorber for Transmission and Reflection Attenuation
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Solution Overview
Problem
Conventional radio wave absorbers containing magnetic powders and binders face challenges in simultaneously increasing both transmission and reflection attenuation amounts, leading to decreased recognition accuracy in radar systems.
Innovation Solution
A radio wave absorber with a magnetic powder volume filling rate of 35% or less and a carbon component volume filling rate between 0% and 2.0% is developed, utilizing hexagonal ferrite and ε-iron oxide powders, which enhances both transmission and reflection attenuation characteristics without the need for a metal layer on the back surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the volume filling rate of magnetic powder is increased to improve radio wave absorption, then the absorption performance improves, but the mechanical strength and durability deteriorate
Solution Approach 1:
The patent uses a composite material system consisting of magnetic powder (hexagonal ferrite or ε-iron oxide), binder resin, and carbon component. This composite structure allows the magnetic powder to provide radio wave absorption while the binder and carbon component maintain mechanical strength, resolving the contradiction between absorption performance and mechanical durability.
Solution Approach 2:
The patent optimizes the volume filling rate of magnetic powder to 35% or less, which is a specific parameter change from conventional high-filling formulations. This parameter adjustment ensures sufficient radio wave absorption while preventing excessive magnetic powder from compromising the mechanical integrity and durability of the absorber.
2Ease of manufacture
If conventional radio wave absorbers are used, then manufacturing is simple, but both transmission and reflection attenuation amounts cannot be simultaneously increased
Solution Approach 1:
The patent employs a three-component composite formulation (magnetic powder, binder resin, carbon component) with specifically controlled volume ratios. This composite approach enables simultaneous optimization of both transmission attenuation (by absorbing transmitted radio waves) and reflection attenuation (by preventing radio wave reflection from the back surface), thereby improving radar recognition accuracy while maintaining manufacturing simplicity through a single-molded-piece structure.
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 proposed radio wave absorber achieves high transmission and reflection attenuation amounts, improving radar recognition accuracy by enhancing directivity and selectivity, while also being cost-effective and durable without metal layer deterioration.
Implementation Method 1
a radio wave absorber containing a magnetic powder as the radio wave absorbing material
Implementation Method 2
a volume filling rate of a carbon component in the radio wave absorber is 0% by volume or more and 2.0% by volume or less
Data Source
AI summary
There is provided a radio wave absorber including a magnetic powder and a binder, in which a volume filling rate of the magnetic powder in the radio wave absorber is 35% by volume or less, and a volume filling rate of a carbon component in the radio wave absorber is 0% by volume or more and 2.0% by volume or less.