Stealth Coatings for Aircraft

A lightweight metamaterial absorber that can absorb a wide range of frequencies from 2-18 GHz for applications like radar stealth and electromagnetic interference mitigation. The absorber is made using a carbon-based conductive film on a foam substrate. The foam provides low density and the carbon film provides conductivity. The absorber has multiple layers of carbon film arrays on foam layers. The carbon film arrays are arranged in a specific pattern to create a metamaterial structure. This allows broadband absorption over multiple frequency bands. The foam also allows the absorber to have wide angle absorption without alignment issues.

Source

A lightning arrester for low-observable vehicles, particularly stealth aircraft, that integrates radar-absorbing structures (RAS) with lightning protection. The arrester features a refractory metal support structure with a high-thermal-stability alloy, such as tungsten, and a high-electrical-conductivity diverting structure, typically a copper alloy. The arrester is designed to penetrate RAS layers while maintaining RF transparency, and is surrounded by a magnetic radar absorber to minimize surface waves. The arrester's tapered design enables electrical connection to the vehicle's conductive structure while receiving lightning strikes.

Source

Multispectral coating that integrates multiple layers of material components to create a comprehensive camouflage system. The coating comprises a series of stacked material segments, each comprising a layered arrangement of materials, defining a unique camouflage profile for the object. The segments are assembled and bonded to the object's surface, with each segment comprising a distinct set of materials and structural arrangements. The coating enables independent camouflage profiles for different regions of the object, allowing selective concealment across multiple spectral bands.

Source

A radar-absorbing structure for air and space vehicles that combines impedance matching and destructive interference to effectively dampen electromagnetic waves. The structure comprises an aerodynamic surface, a resistive layer, and multiple films with electroactive polymers and graphene, which are cured together to provide both impedance matching and destructive interference properties. The structure can also incorporate sensors and a control unit to detect changes in the electroactive polymer films and transmit spoofing signals to the radar source.

Source

A coating material for aircraft surfaces that provides lightning protection while maintaining radar stealth capabilities. The material comprises a dielectric matrix with embedded two-dimensional flakes of a metallic or soft-magnetic material, specifically designed to maximize magnetic losses. The flakes are geometrically optimized with a thickness-to-diameter ratio of 1:3 or less, and are separated from each other or coated with an electrically non-conductive layer to prevent electrical conduction. This design enables efficient diversion of lightning currents without compromising radar absorption properties.

Source

Infrared stealth composite material structure for high-speed aircraft that provides infrared stealth without compromising heat dissipation. The structure consists of a reflective layer sandwiched between a first dielectric film and a protective layer. The reflective layer reflects infrared radiation, preventing it from escaping the aircraft. The dielectric film and protective layer have specific refractive indices to allow infrared radiation in certain bands to pass through. This allows the aircraft surface to radiate heat in those bands while blocking detection in other bands. The reflective layer modulates the radiated infrared spectrum to prevent detection in critical bands while allowing dissipation in others.

Source

A dynamic camouflage system for aircraft and spacecraft that rapidly adapts its appearance through controlled manipulation of microscopic structure. The system employs an active coating with integrated, wavelength-dependent microscopic structures that can be precisely arranged to produce selective diffraction patterns. By varying the structure's arrangement, the system can dynamically change its appearance to evade detection, particularly in the infrared range. The system's control mechanism can be programmed to achieve specific camouflage patterns through electrical signals, enabling rapid adaptation to changing environmental conditions.

Source

A visible and infrared stealth element comprising a MXene layer, a semiconductor layer, and a dielectric layer, where the MXene layer has high electrical conductivity and mechanical properties, the semiconductor layer controls color and thermal radiation, and the dielectric layer has a low refractive index for efficient light transmission.

Source

This patent introduces a lightweight stealth coating built using a nano-carbon aerogel composed of graphene oxide, carbon nanotubes, and wave-absorbing agents. The structure delivers low density, low thermal conductivity, and strong broadband EM absorption. It withstands high-temperature exposure while maintaining thermal-insulation performance. The coating is designed for advanced stealth applications requiring both heat resistance and electromagnetic signature reduction.

Source

Stealth coating for military aircraft that achieves radar invisibility through a multi-layered film structure. The coating comprises a substrate coated with a vacuum-deposited laminate of multiple ultra-fine layers, each optimized for specific stealth functions. The layers are engineered to provide temperature resistance, wear resistance, low drag, and broadband radar absorption across visible and infrared spectrums. The coating combines the benefits of conventional stealth materials while overcoming their limitations through its unique multi-layered design.

Source

A multi-band stealth device that simultaneously counteracts infrared laser-guided, millimeter wave radar, and thermal infrared detection technologies. The device features a wavelength-selective absorption pattern layer that selectively transmits near-infrared light while absorbing mid- to far-infrared radiation, and a dual-band electromagnetic wave absorption layer that absorbs millimeter wave radar frequencies. The device's unique structure enables it to simultaneously achieve stealth against multiple detection technologies.

Source

Aircraft cloaking system that enables adaptive camouflage through integrated electroluminescent paint technology. The system comprises cameras to detect background colors, power sources to activate the electroluminescent paint patterns, and a processor to coordinate the activation of the paint patterns in response to detected background colors. The processor enables the system to automatically adjust the color and luminescence of the paint patterns to match the detected background conditions, providing enhanced camouflage capabilities across various environments.

Source

A multi-layered resonant structure for absorbing electromagnetic radar energy on optically transparent surfaces, comprising thin conductive films sandwiched between quarter-wavelength thick lossy material layers. The conductive films have progressively increasing sheet resistances as they approach the base material, dissipating energy while the lossy layers cause destructive interference of the electromagnetic energy. The structure provides over 15 dB of energy absorption over a wide frequency range, enabling stealth applications on transparent surfaces such as windshields, canopies, and optical sensors.

Source

A non-invasive, high-performance infrared dye for stealth applications on metal surfaces. The dye operates in the 300 nm-25000 nm infrared spectrum and exhibits broad spectral absorption properties, enabling effective infrared radiation reduction. The dye is produced through a scalable, cost-effective process involving titanium dioxide nanoparticles, which are combined with a carrier solution to form a transparent, non-toxic dye. This dye can be applied to metal surfaces to achieve infrared radiation reduction while maintaining optical transparency.

Source

A stealthy aircraft carrier design incorporating advanced radar-absorbent materials (RAM) with integrated acoustic protection. The carrier features a dual-layered surface coating system comprising a polyurethane foam layer and a graphene-based radiation-absorbing layer. This composite coating system provides both radar-absorbent and acoustic protection, enabling the carrier to evade detection while maintaining stable buoyancy and maneuverability. The system integrates a permanent floating airbag system for enhanced survivability in extreme environments.

Source

A three-dimensional diffuse reflection and wave-absorbing coating for aircraft stealth that combines the principles of planar stealth coatings with the advantages of three-dimensional wave absorption. The coating comprises a rigid polyurethane foam layer with integrated polyurea waterproof coatings, which provides both structural integrity and high-performance wave absorption. The polyurea layer generates electronic polarization through surface electronic polarization, enhancing the coating's radar-absorbent properties. This multi-layered approach enables a comprehensive solution for aircraft stealth that addresses both reflection reduction and wave absorption capabilities.

Source

A novel radar-absorbing paint for military stealth technology that enables aircraft to evade detection by radar systems. The paint employs a unique composition of buckminsterfullerene particles with a specially designed elastic base, which provides enhanced radiation retention properties. The buckminsterfullerene particles are incorporated into a high-temperature, flame-resistant paint that maintains its structural integrity even at supersonic speeds. This paint achieves radar absorption while maintaining structural integrity, enabling aircraft to operate at low altitudes without being detected by radar systems.

Source

Electromagnetic wave unidirectional conductive coating for aircraft surfaces that combines stealth radar-absorbing properties with electromagnetic wave transmission control. The coating comprises a surfactant-based dispersion of nanometer copper-zinc powders, nanometer ultrafine carbon black, and graphene, with an adhesion promoter and anti-settling agent. The dispersion is prepared through a surfactant-free dispersion process, followed by grinding to achieve a fineness below 25 microns. The dispersion is then formulated with a surfactant, anti-static agent, and adhesion promoter, and filtered and packaged for application on aircraft surfaces.

Source

A stealth high maneuvering target aircraft with improved radar cross-section (RCS) and high-g maneuverability. The aircraft features a swept-back wing with ailerons, a trapezoidal fuselage, and a "clam-type" air inlet. Its control system enables stable flight control at high overload levels (up to 8g) through combined overload and attitude control. The aircraft's design and control system enable it to simulate the flight characteristics of high-performance combat aircraft while maintaining a low RCS.

Source

A stealth coating for aircraft surfaces that combines high-temperature thermal insulation with full-frequency wave absorption. The coating comprises a reinforced chopped fiber matrix, pressure-resistant hollow microspheres, and a wave-absorbing agent. The reinforced fiber matrix provides excellent thermal insulation, while the pressure-resistant hollow microspheres enhance wave absorption at frequencies above 1 GHz. The wave-absorbing agent further enhances the coating's radar-absorbing properties. This integrated coating enables aircraft surfaces to achieve both thermal protection and radar stealth capabilities.

Source

Preparing near-infrared absorption coatings with enhanced lubricant resistance through a novel modification of polyurethane (PU)/Sericite/Silane composite coatings. The modification involves incorporating KH550, a sericite-based coupling agent, into the PU/Sm2O3 composite system. This modification enables the formation of a denser, more compatible interface between the filler and the adhesive, while maintaining the high absorption properties of the Sm2O3 filler. The KH550 modification enables the creation of a more robust interface structure that enhances the coating's mechanical properties and resistance to environmental degradation, particularly in applications requiring high lubricant resistance.

Source

A multi-band stealth coating for aircraft that achieves both electromagnetic and acoustic stealth capabilities. The coating combines a hybrid nanomaterial system comprising a mixture of iron oxide nanoparticles and organic silicate with a cross-linked polyurethane matrix. The nanomaterials provide broadband absorption across electromagnetic and infrared frequencies, while the polyurethane matrix enhances mechanical properties and adhesion. The coating exhibits improved durability and corrosion resistance compared to traditional stealth coatings, enabling simultaneous electromagnetic and acoustic stealth performance.

Source

A method for preparing stealth coatings for aircraft that addresses conventional limitations in radar-absorbent materials (RAM). The method enables the creation of high-performance, low-weight stealth coatings through the integration of advanced nano-absorbent materials with conventional aircraft coatings. The nano-absorbent components provide exceptional radar-absorbance characteristics while maintaining superior durability and weather resistance compared to traditional RAM formulations. This integrated approach enables the development of ultra-lightweight, high-performance stealth coatings that meet the stringent requirements of modern aircraft applications.

Source

A method for preparing stealth coatings that addresses common challenges in aerospace applications such as moisture, salt spray, high temperature, and mildew resistance. The method employs a nano-absorbent coating comprising inorganic nano-materials and organic polymer materials, where the nano-materials are precisely controlled to achieve optimal absorption performance. This nano-absorbent coating system enables the creation of stealth coatings that maintain their performance characteristics across a wide range of environmental conditions, including extreme temperatures and humidity levels, while maintaining their radar-absorbent properties.

Source

A multi-functional stealth coating for aircraft that simultaneously absorbs and attenuates electromagnetic waves and sound waves, reducing reflection and scattering. The coating comprises a matrix of acrylic resin, polyurethane, and aqueous resin, with specific additives including nickel, isophorone diisocyanate, zinc chromate, triethanolamine, and zinc oxide. The coating achieves infrared reflectance and thermal control through its unique composition and processing, enabling effective stealth performance across multiple electromagnetic bands.

Source

A stealth coating for aircraft that combines broadband electromagnetic absorption with multi-band functionality. The coating comprises a matrix of hydroxy acrylic resin, nitrile rubber, polypropylene emulsion, and dispersant, with added components like zinc oxide, chromium oxide, and calcium oxide. The matrix is formulated with a specific ratio of these components to achieve optimal absorption and reflectivity characteristics. The coating is prepared through a multi-step process involving polymerization, thermal processing, and dispersion, resulting in a material with enhanced broadband absorption and multi-band functionality.

Source

A water-based stealth coating for aircraft that achieves high absorbing performance through a novel nanostructured polymer matrix. The coating combines a polymer matrix with nanostructured inorganic particles to create a broadband absorbing material that covers electromagnetic spectrum frequencies from radar to infrared. The nanostructured particles enhance absorption while maintaining low surface density and high mechanical properties. This coating achieves superior radar-absorbing performance compared to traditional water-based coatings while maintaining the advantages of water-based formulations.

Source

A device for reducing electromagnetic energy, such as radar or radio signals, that uses geometric shapes with prime numbers in their construction. The device, called a prime polygon reflector, has reflective surfaces that cause multiple internal reflections of incident waveforms. This increases absorption of the waveforms when combined with absorptive materials. The prime polygon shapes allow non-inverted reflections compared to flat surfaces. The device can be used as a panel, like a roof or wall material, to actively reduce electromagnetic exposure without needing an electrical ground.

Source

Cloaking and deception of radar systems by using resonator arrays that can dynamically change the phase of the reflected radar signal. The resonator arrays are configured to provide a time-varying resonance frequency characterized by a linear temporal function. This allows compensating for the Doppler shift of the radar signal due to the object's motion, making it appear stationary to the radar. The resonator arrays collectively generate a phase shift between the incident and scattered radar waves when the resonance frequency varies over a range. By controlling the resonance frequency with a linear time dependence, the radar sees a phase shift that cancels out the Doppler shift. This cloaks the object from radar detection even though it reflects radar energy.

Source

Aircraft design that integrates stealth features with optimal radiation protection. The aircraft features a dual-profile design where the outer surface is made of a transparent material, while the inner surface is coated with a reflective material. This dual-layer design ensures both aerodynamic performance and radiation protection, with the transparent outer surface providing aerodynamic advantages and the reflective inner surface providing effective radiation shielding.

Source