Gradient Radar-Absorbing Layer Production via Binder Mixing
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Solution Overview
Problem
Existing radar-absorbing materials and structures struggle to optimize the absorption of electromagnetic radiation across varying frequency ranges and spatial directions, leading to inefficient reduction of radar wave reflection on surfaces of transportation vehicles.
Innovation Solution
A method involving a layer production technique using a mixture of powder material and binders with predefined particle concentration distributions, allowing for gradient creation in dielectric constant and permeability, and the use of different particles that repel each other for optimized particle distribution and absorption, enabling finely resolved particle concentration variations and structures for enhanced electromagnetic radiation absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If radar-absorbing materials are applied uniformly on the surface, then the absorption properties are consistent, but the ability to optimize absorption across varying frequency ranges and spatial directions is limited
Solution Approach 1:
The patent applies local quality by creating spatially varying particle concentrations of radar-absorbing materials within the coating layer. Different regions of the coating contain different concentrations of particles with specific dielectric constants and permeabilities, allowing each local region to be optimized for specific frequency ranges and incident angles of radar waves, thereby resolving the contradiction between adaptability and manufacturing precision
Solution Approach 2:
The patent changes physical parameters (particle concentration, dielectric constant, permeability) continuously across the coating layer to optimize absorption. By varying these parameters locally rather than uniformly, the coating can adapt to different frequency ranges and spatial directions while maintaining precise control over the absorption characteristics through controlled parameter gradients
2Ease of manufacture
If material layers are applied in the form of a grid, then the application process is simplified, but the particle concentration distribution and gradient precision are reduced
Solution Approach 1:
The patent employs spray application technology to deposit radar-absorbing material particles onto the substrate. This hydraulic/pneumatic method allows for continuous and controlled deposition of particles with varying concentrations across the surface, achieving precise particle concentration distributions without the discretization limitations of grid-based application methods
Solution Approach 2:
The spray application process enables dynamic control of particle concentration during deposition. By adjusting spray parameters (flow rate, distance, angle, particle feed rate), the system can continuously vary the deposited particle concentration to create precise gradients and spatial distributions, overcoming the fixed grid pattern limitations
3Adaptability or versatility
If a single binder is used for powder material, then the binding process is simple, but the ability to create gradient structures in dielectric constant and permeability is limited
Solution Approach 1:
The patent uses composite binder systems combining multiple binders with different properties and particle concentrations. This allows the creation of gradient structures by controlling the mixing ratios and spatial distribution of different binders, enabling precise control over dielectric constant and permeability gradients while managing the increased complexity through systematic composite material design
Solution Approach 2:
The multi-binder system enables local quality optimization by allowing different binder compositions to be applied to different regions. Each binder can be tailored with specific particle concentrations and properties, and their spatial arrangement creates the desired gradient structures, resolving the contradiction between versatility and complexity
4Reliability
If particles for electromagnetic radiation absorption are concentrated uniformly, then the absorption is consistent, but the finely resolved particle concentration variations needed for optimized absorption are lost
Solution Approach 1:
The patent implements local quality by creating spatially non-uniform particle concentration distributions within the coating. Different regions contain different concentrations of radar-absorbing particles, allowing each local area to be optimized for specific absorption requirements while maintaining overall reliability through controlled variation rather than random distribution
Solution Approach 2:
The system controls particle concentration as a varying parameter across the coating layer. By systematically changing particle concentration from region to region, the patent achieves both reliability (through controlled, predictable variations) and adaptability (through tailored local concentrations for different frequency ranges and incident angles)
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 method achieves improved absorption of electromagnetic radiation across specific frequency ranges, reducing radar wave reflection and enhancing the accuracy and flexibility of radar-absorbing structures, particularly in the megahertz, gigahertz, and terahertz ranges, by producing layers with finely resolved particle concentration gradients and structures.
Implementation Method 1
mixing the first and second binder according to the mixing ratio for the selected position
Implementation Method 2
The individual particles of the powder material are adhesively bonded to one another using the binder mixture made of the first and second binder
Implementation Method 3
particles for the absorption of electromagnetic radiation
Data Source
AI summary
A method for producing a layer of a device for electromagnetic radiation absorption, includes: providing a ply of powder material in the layer to be produced of the device; providing a predefined concentration distribution of particles for electromagnetic radiation absorption in the layer; providing a first binder and a second binder for the powder materials, wherein the first binder includes particles for the absorption of electromagnetic radiation, wherein the second binder includes a lower concentration of identical and/or different particles than the first binder; determining a mixing ratio between the first binder and the second binder for every position in the layer; selecting a position of the layer; mixing the first and second binder according to the mixing ratio for the selected position; wetting the powder material at the selected position using the mixed first and second binders; and repeating selecting, mixing, and wetting to produce the layer.