Electromagnetic Wave Absorber With Tin Oxide Resistive Layer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electromagnetic wave absorbers, particularly λ/4 absorbers, lack sufficient chemical resistance, which is crucial for durability in environments where they are exposed to chemicals, such as in vehicle maintenance scenarios.
Innovation Solution
An electromagnetic wave absorber design featuring a resistive layer with tin oxide or titanium oxide as the main component, or indium tin oxide with 40 weight % or more tin oxide, combined with a dielectric and electrically conductive layer, where the resistive layer has a specific resistance of 5×10−4 Ω·cm or more, providing enhanced chemical resistance and electromagnetic wave absorption performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional resistive layer is used in a λ/4 electromagnetic wave absorber, then the production cost is low and manufacturing is easy, but the chemical resistance is insufficient
Solution Approach 1:
The patent changes the material composition parameters of the resistive layer by specifying tin oxide or titanium oxide as main components, or indium tin oxide with 40 weight % or more of tin oxide. This parameter change achieves good chemical resistance while maintaining ease of manufacture through established deposition processes
Solution Approach 2:
The patent employs composite material strategies by using oxide-based resistive layers (tin oxide, titanium oxide, or indium tin oxide composites) that combine chemical stability with appropriate electrical resistance properties, resolving the contradiction between chemical resistance and manufacturability
2Reliability
If the resistive layer thickness is increased to improve chemical resistance, then durability improves, but production time increases
Solution Approach 1:
The patent optimizes the thickness parameter of the resistive layer to achieve the minimum required thickness that provides sufficient chemical resistance. By specifying precise thickness ranges, the patent balances durability improvement with production time reduction, avoiding excessive material deposition while ensuring adequate protection
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 design achieves good chemical resistance and effective electromagnetic wave absorption, particularly in the frequency range of 50 to 100 GHz, while maintaining a low production time and cost, by optimizing the thickness and composition of the resistive layer.
Implementation Method 1
a resistive layer that is disposed on one principal surface of the dielectric layer
Implementation Method 2
an electromagnetic wave absorber including: a dielectric layer; a resistive layer that is disposed on one principal surface of the dielectric layer
Implementation Method 3
an electrically conductive layer that is disposed on the other principal surface of the dielectric layer and has a sheet resistance lower than a sheet resistance of the resistive layer
Data Source
AI summary
An electromagnetic wave absorber (1) includes a dielectric layer (10), a resistive layer (20), and an electrically conductive layer (30). The resistive layer (20) is disposed on one principal surface of the dielectric layer (10). The electrically conductive layer (30) is disposed on the other principal surface of the dielectric layer (10) and has a sheet resistance lower than a sheet resistance of the resistive layer (20). The resistive layer (20) is a layer that includes tin oxide or titanium oxide as a main component or a layer that is made of indium tin oxide including 40 weight % or more of tin oxide.