Hexagonal Ferrite Radio Wave Absorber With Controlled Squareness Ratio
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Solution Overview
Problem
Conventional radio wave absorbers containing hexagonal ferrite and a binder do not consistently exhibit sufficient radio wave absorbability.
Innovation Solution
A radio wave absorber comprising a powder of substitution-type magnetoplumbite-type hexagonal ferrite, where a part of iron atoms are substituted with aluminum atoms, and a binder, with a squareness ratio ranging from 0.40 to 0.60, enhancing radio wave absorbability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional hexagonal ferrite powder and binder are used, then workability into desired shape is improved, but radio wave absorbability is insufficient
Solution Approach 1:
The invention changes the magnetic parameters of the hexagonal ferrite powder by controlling the squareness ratio to be 0.25 or less. This parameter change allows the material to maintain good radio wave absorbability while being processable with conventional binders into desired shapes, thus resolving the contradiction between workability and absorbability.
Solution Approach 2:
The invention creates a composite material system consisting of hexagonal ferrite powder with specific magnetic properties (squareness ratio ≤ 0.25) combined with conventional binders. This composite approach enables both good workability for shaping and sufficient radio wave absorbability, as the optimized powder properties compensate for the presence of the binder.
2Reliability
If high frequency band absorbability is improved, then transmission attenuation is enhanced, but manufacturing precision of magnetic properties becomes more difficult to control
Solution Approach 1:
The invention identifies the squareness ratio as a key parameter that directly influences high-frequency absorbability. By setting the squareness ratio to 0.25 or less, the invention achieves good radio wave absorbability in high frequency bands while providing a clear, controllable manufacturing target that simplifies rather than complicates the control of magnetic properties.
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 absorber achieves excellent radio wave absorbability in high frequency bands, improving the alignment of easily magnetizable axes and maintaining good crystallinity, thereby enhancing transmission attenuation.
Implementation Method 1
a radio wave absorber including a powder of a hexagonal ferrite and a binder, in which the radio wave absorber has a squareness ratio in a range of 0.40 to 0.60
Implementation Method 2
improving the alignment of easily magnetizable axes
Data Source
AI summary
There is provided a radio wave absorber including a powder of a hexagonal ferrite; and a binder, in which the radio wave absorber has a squareness ratio in a range of 0.40 to 0.60.