Conductive Mesh Thin-Film for Aircraft Window Stealth and Shielding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing window technologies for aircraft struggle to maintain radio wave stealth and electromagnetic wave shielding properties while ensuring transparency and durability, especially on curved surfaces, as conventional transparent conducting films are prone to cracking and reduce visible light transmissivity.
Innovation Solution
A method involving the formation of a conductive mesh thin-film on transparent window members, either before or after bending, to ensure uniform coverage and flexibility, allowing the film to deform with the window surface and maintain contact, thereby enhancing stealth and shielding properties while maintaining transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a transparent conducting film is coated on a curved window member to achieve radio wave stealth and electromagnetic wave shielding, then the shielding property is improved, but the film cannot be coated uniformly due to the curved surface
Solution Approach 1:
The continuous transparent conducting film is segmented into a mesh pattern, where the film is formed in an uncurved state and then the window member is bent into its curved configuration. This segmentation allows the film to be coated uniformly on a flat surface before deformation, avoiding the uniformity problems of coating on curved surfaces.
Solution Approach 2:
The transparent conducting film is coated on the window member in an uncurved state before the window is bent into its final curved configuration. This preliminary action of coating allows for uniform film deposition on a flat surface, and the film is then deformed together with the window member to achieve the curved shape without compromising coating uniformity.
2Reliability
If the transparent conducting film is made thicker to enhance radio wave stealth and electromagnetic wave shielding, then the shielding property is improved, but the transparency to visible radiation decreases
Solution Approach 1:
The film is patterned into a mesh structure with periodic openings, which segments the continuous conducting layer. This segmentation reduces the overall amount of conducting material in the optical path while maintaining the electromagnetic shielding effect through the mesh geometry, thereby improving visible light transmission while preserving radio wave stealth properties.
Solution Approach 2:
The mesh pattern creates local variations in the film structure, with conducting regions providing electromagnetic shielding and open regions allowing visible light transmission. This local quality differentiation allows different parts of the window to serve different functions - shielding where needed and transmitting light where needed.
3Reliability
If a ceramic transparent conducting film such as ITO is coated on the inner side of the window to prevent cracking during flight, then the durability is improved, but the flexibility to accommodate deformation is reduced
Solution Approach 1:
The patent employs a thin-film transparent conducting film that can be formed in an uncurved state and then deformed together with the window member when it bends during flight. This flexible thin-film approach allows the coating to accommodate the deformation of the curved window surface without cracking, while still providing effective electromagnetic wave shielding.
4Shape
If the window member is bent into a multiple curved surface shape to achieve the desired aerodynamic profile, then the aerodynamic performance is improved, but it becomes difficult to coat the transparent conducting film uniformly
Solution Approach 1:
The window member is coated with the transparent conducting film in an uncurved, flat state before being bent into the final multiple curved surface configuration. This preliminary coating action allows for easy and uniform film deposition on a flat surface, and subsequent bending deforms the entire assembly (window member plus film) together to achieve the aerodynamic profile without compromising coating quality.
Solution Approach 2:
The coating process and the window forming process are merged into a sequence where coating occurs first on a flat substrate, and then the entire coated assembly is deformed together. This merging of processes allows the film to be applied under optimal conditions and then conform to the complex curved shape through coordinated deformation of the window member and film together.
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 radio wave stealth and electromagnetic wave shielding with maintained transparency and durability, preventing cracking and ensuring effective radar scattering and electromagnetic wave protection.
Implementation Method 1
a radio wave stealth property which scatters radio waves in various directions so as not to be detected by radar
Implementation Method 2
an electromagnetic wave shield property which prevents harmful electromagnetic waves, except for visible radiation, from invasion into an aircraft
Data Source
AI summary
There is provided a method of manufacturing a window having at least one of a radio wave stealth property and an electromagnetic wave shield property comprising: a step for forming a thin-film composed of a conductive material on the surface of a transparent window member having a curved surface, and a step for forming the thin-film into a mesh shape. As a result, it is, possible to manufacture, at lower cost, a window having a radio wave stealth property that scatters radio waves in various directions so as not to be detected by radar, while transparency to visible light is improved, as well as a window having an electromagnetic wave shield property that effectively prevents harmful electromagnetic waves, except for visible radiation, from invasion into an aircraft.