Abstract: A Thermal Transparency Control Device (TTCD), comprising: an inner layer of Polymer Dispersed Liquid Crystal (PDLC) capable of changing an arrangement of liquid crystals comprised therein, in response to a change in a level of voltage supplied to the PDLC, so that the inner layer becomes more transparent as the voltage increases, thereby enabling more thermal radiation to pass through the inner layer; the inner layer placed between two outer layers of material wherein at least part of each of the two outer layers enables thermal radiation passage therethrough and wherein each of the two outer layers comprises an electrical interface that is in contact with the inner layer.

Abstract: A forming method of a composite magnetic sheet. The forming method comprises a preparing step, a forming step and a heat-treating step. In the preparing step, magnetic slurry is prepared by mixing at least a soft magnetic powder having a flat shape, a first resin having a solid component and a second resin having a solid component, weight loss of the solid component of the first resin being 4.0% or less at 220° C., weight loss of the solid component of the second resin being 5.0% or more at 220° C. In the forming step, the magnetic slurry is formed into an intermediate body having a sheet-like shape. In the heat-treating step, the intermediate body is heat-treated at a heat-treatment temperature between 220° C. and 400° C. (both inclusive).

Abstract: Disclosed is a compressible sound attenuation core, having one or more flexible, inflatable chambers, having one or more internal sound baffles. The chamber(s) can have at least one sound attenuation material affixed to a first predominant surface of the inflatable chamber(s). The sound attenuation core can be further framed by a novel extruded frame system that provides, inter-connectivity, support and integrity to form portable, modular sound attenuation panels that can be used to construct a variety of soundproofing devices, including but not limited to, partitions, walls, enclosures, structures, offices, aircraft hangars, and booths.

Abstract: It is herein proposed a novel multi-spectral artificial target device for producing a deceptive thermal and radar signature of an object. The device features a multi-layer structure with a substrate and a functional thermal signal layer, which is provided directly or indirectly on the substrate. The substrate is made of pliable material which is capable of being shaped on a frame. The thermal signal layer includes electrically conductive material such arranged to form an array of independently controlled thermal elements for outputting a thermal signal, which is observable in the infra-red spectrum, upon exposure to a control voltage. The multi-layer structure further includes a functional radar signal layer, which is provided directly or indirectly onto the substrate. The radar signal layer outputs a radar response signal, which is observable in the radio frequency spectrum, upon exposure to an external radar stimulus or excitation.

Abstract: Provided is a plurality of flaky magnetic metal particles of embodiments, each flaky magnetic metal particle having a flat surface having either or both of a plurality of concavities and a plurality of convexities, the concavities or convexities being arranged in a first direction and each having a width of 0.1 ?m or more, a length of 1 ?m or more, and an aspect ratio of 2 or higher; and a magnetic metal phase containing at least one primary element selected from the group consisting of iron (Fe), cobalt (Co), and nickel (Ni). The flaky magnetic metal particles have an average thickness of between 10 nm and 100 ?m inclusive, and the average value of the ratio of the average length within the flat surface with respect to the thickness is between 5 and 10,000 inclusive.

Abstract: Materials and methods for mitigating passive intermodulation. A membrane for reducing passive intermodulation includes a first polymeric layer, a second polymeric layer, and a continuous metal layer encapsulated between the first and second polymeric layers. A self-adhesive radio frequency barrier tape includes a waterproof polymeric top layer, a metal-containing layer adhered by an adhesive layer to the polymeric top layer, a pressure sensitive adhesive layer adhered to the metal-containing layer, and a release liner on a bottom surface of the pressure sensitive adhesive layer. A method of mitigating passive intermodulation includes passing a probe over an area of interest, the probe being sensitive to an intermodulation frequency of interest, and identifying a suspected source of passive intermodulation when the amplitude of the probe output exceeds a threshold at the frequency of interest.

Abstract: An optically transparent radar absorbing material has alternating layers of optically transparent conductive material with layers of even thickness of optically transparent material having a homogenous dielectric constant. The even thickness is one quarter of the wavelength of a targeted electromagnetic energy.

Abstract: Disclosed is a camouflage fabric which simplifies a preparation process of warps and wefts so as to assure convenience in warp and weft preparation and acquires combinations of various patterns and colors using a three-ply fabric structure so as to satisfy aesthetics, i.e., one of functions of clothing, and to have an excellent camouflaging effect. Dyed yarns of a dark color and dyed yarns of a light color are alternately arranged as the warps, dyed yarns of three colors differing from the colors of the warps are used as the wefts, the warps and the wefts are woven into the camouflage fabric of a three-ply jacquard texture using a jacquard loom and, thus, the camouflage fabric may have combinations of various patterns and colors.

Abstract: A frequency-selective composite structure includes a laminate panel, and a frequency-selective filter including a plurality of frequency-selective surface elements coupled to an exterior surface of the laminate panel and arranged in a frequency-selective surface pattern, wherein each one of the frequency-selective surface elements includes a nanomaterial composite.

Abstract: A method and apparatus for producing a radio frequency absorber (RFA) or perfect microwave absorber (PMA) skin is described herein. A metamaterial layer may be applied to a low dielectric substrate. Resistive and capacitive components may then be added to the metamaterial layer. The metamaterial layer may then be formed into an RFA or PMA skin, which may then be applied to a multi-layered assembly for absorption of electromagnetic radiation in a frequency range such as the microwave frequency spectrum in a final product including but limited to cell phones, communication devices, or other electronic devices.

Abstract: The present invention relates to a wave-absorbing metamaterial, comprising a substrate which is provided with two opposite lateral surfaces, wherein a plurality of periodically arranged artificial metal microstructures are attached on at least one of the two opposite lateral surfaces; when an electromagnetic wave having an incident direction vertical to the two opposite lateral surfaces of the substrate is transmitted to the wave-absorbing metamaterial, a relative permittivity of the metamaterial is substantially equal to a relative magnetic conductivity of the metamaterial.

Abstract: Systems according to the present disclosure provide one or more surfaces or structures that function as power transferring surfaces or structures (deflective shields) for which at least a portion of which includes or is composed of “fractal cells” placed sufficiently closed close together to one another so that a surface (plasmonic) wave causes near or similar replication of current present in one fractal cell in an adjacent fractal cell. A fractal of such a fractal cell can be of any suitable fractal shape and may have two or more iterations. The fractal cells may lie on a flat or curved sheet or layer and be composed in layers for wide bandwidth or multibandwidth transmission. The surfaces and/or structures can also provide cloaking of objects inside the shields.

Abstract: Disclosed is an electromagnetic wave absorbent which exhibits high electromagnetic wave absorption performance over a wide band. The electromagnetic wave absorbent contains a conductive fiber sheet which is obtained by coating a fiber sheet base with a conductive polymer and has a surface resistivity within a specific range. The conductive fiber sheet is formed by impregnating a fiber sheet base such as a nonwoven fabric with an aqueous oxidant solution that contains a dopant, and then bringing the resulting fiber sheet base into contact with a gaseous monomer for a conductive polymer, so that the monomer is oxidatively polymerized thereon.

Abstract: An electromagnetic wave absorbing device includes a ground layer formed of a metal conductor layer, a dielectric layer formed on the ground layer, and a unit cell pattern layer which is formed on the dielectric layer and made of resistive materials, wherein at least two electromagnetic bandgap-based unit cell patterns are periodically arranged on the unit cell pattern layer.

Abstract: A synthetic aperture radar's surveillance is defeated by electronic camouflage that employs a protective shield to cover an intended target. The shield intercepts and modifies the interrogating radar pulses by modulating incident radar pulses to produce radar echoes shifted in Doppler frequency, whereby the returned echoes give a false depiction of the target, even to smearing the radar display. New structures are presented that exhibit variable reflectivity and variable dielectric characteristics of particular use in the foregoing and other electronic systems.

Abstract: A selectively reflective construct, and a method for making the construct, are described. In one embodiment reflectance, transmission and absorption properties may be controlled in multiple electromagnetic bands. A construct is described comprising a) a thermally transparent, visually opaque substrate comprising a polymeric material and a colorant, and b) a thermally reflective layer comprising a low emissivity component which is optionally transparent to radar signal.

Abstract: The invention pertains to a device for signature adaptation, comprising at least one surface element (100; 300; 500) arranged to assume a determined thermal distribution, wherein said surface element comprises at least one temperature generating element (150; 450a, 450b, 450c) arranged to generate at least one predetermined temperature gradient to a portion of said at least one surface element. Said at least one surface element (100; 300; 500) comprises at least one radar suppressing element (190), wherein said at least one radar suppressing element (190) is arranged to suppress reflections of incident radio waves. The invention also concerns an object provided with a device for signature adaptation.

Abstract: The invention pertains to a device for signature adaptation, comprising at least one surface element (100; 300; 500) arranged to assume a determined thermal distribution, wherein said surface element comprises at least one temperature generating element (150; 450a, 450b, 450c) arranged to generate at least one predetermined temperature gradient to a portion of said at least one surface element. Said surface element (100; 300; 500) comprising at least one display surface (50), wherein said display surface (50) is arranged to radiate at least one predetermined spectrum. The invention also pertains to a method for signature adaptation and an object such as a craft provided with the device according to the invention.

Abstract: A system for reducing the effects of a blast wave includes armor plating configured to face a supersonic blast wave. The armor plating has a surface consisting of alternating tall and short peaks with valleys between the peaks. The peaks and valleys are positioned such that the supersonic blast wave reflects from the side surfaces of the tall peaks as a regular reflection that at least partially suppresses Mach reflection of the supersonic wave caused by the short peaks and the valleys. The surface may also be designed to not trap reflected waves. The valleys can be parabolic shaped to deflect and/or dissipate transonic flow that follows the blast wave front.

Abstract: Structures and methods for cloaking an object to electromagnetic radiation at the microwave and terahertz frequencies include disposing a plurality of graphene sheets about the object. Intermediate layers of a transparent dielectric material can be disposed between graphene sheets to optimize the performance. In other embodiments, the graphene can be formulated into a paint formulation or a fabric and applied to the object. The structures and methods absorb at least a portion of the electromagnetic radiation at the microwave and terabyte frequencies.

Abstract: Structures and methods for cloaking an object to electromagnetic radiation at the microwave and terahertz frequencies include disposing a plurality of graphene sheets about the object. Intermediate layers of a transparent dielectric material can be disposed between graphene sheets to optimize the performance. In other embodiments, the graphene can be formulated into a paint formulation or a fabric and applied to the object. The structures and methods absorb at least a portion of the electromagnetic radiation at the microwave and terabyte frequencies.

Abstract: In one embodiment of the present invention, a conductive pattern portion formed in a pattern layer functions as an antenna, and, when electromagnetic waves at a predetermined frequency arrive, resonance occurs, and an electromagnetic wave of a specific frequency is introduced into a sheet member. As to the sheet member having the pattern layer, even in a small and thin sheet member, the phase of reflected waves from the reflection area can be adjusted, and thus an area having high electric field intensity due to interference between reflected waves from the reflection area and arriving electromagnetic waves can be set in the vicinity of the antenna element. When the sheet member is disposed between an antenna element and a communication jamming member, an electromagnetic field is generated around the conductive pattern portion, and an electromagnetic energy is supplied from the conductive pattern portion to the antenna element, and therefore receiving power of the antenna element can be increased.

Abstract: A visual camouflage system that provides at least one of thermal or radar suppression is described. The system includes a vinyl layer having a camouflage pattern on a front surface of the vinyl layer. The camouflage pattern includes a site-specific camouflage pattern. A laminate layer is secured over the front surface of the vinyl layer coating the camouflage pattern to provide protection to the camouflage pattern and strengthen the vinyl layer. One or more nanomaterials are disposed on at least one of the vinyl layer, camouflage pattern, or the laminate to provide at least one of thermal or radar suppression.

Abstract: Systems and assemblies for simultaneous adaptive camouflage, concealment and deception are provided. The assemblies that can be used in the systems include a vinyl substrate layer and a miniaturized thermoelectric device array secured to the vinyl substrate layer. The miniaturized thermoelectric device array is configured to provide an adaptive thermal signature to a side of the miniaturized thermoelectric device array that faces outward from the vinyl substrate layer. A flexible image display matrix can be secured on the vinyl substrate layer. The flexible image display matrix can be configured to display visual images. A laminate layer can be secured over the vinyl substrate layer covering the flexible image display matrix and the miniaturized thermoelectric device array to provide protection and strengthen the assemblies. One or more nanomaterials can be disposed on the vinyl substrate layer or the laminate layer to provide thermal or radar suppression.

Abstract: Systems and assemblies for simultaneous adaptive camouflage, concealment and deception are provided. The assemblies that can be used in the systems include a vinyl substrate layer and a miniaturized thermoelectric device array secured to the vinyl substrate layer. The miniaturized thermoelectric device array is configured to provide an adaptive thermal signature to a side of the miniaturized thermoelectric device array that faces outward from the vinyl substrate layer. A flexible image display matrix can be secured on the vinyl substrate layer. The flexible image display matrix can be configured to display visual images. A laminate layer can be secured over the vinyl substrate layer covering the flexible image display matrix and the miniaturized thermoelectric device array to provide protection and strengthen the assemblies. One or more nanomaterials can be disposed on the vinyl substrate layer or the laminate layer to provide thermal or radar suppression.

Abstract: A microwave absorber, especially for high temperature applications, has at least one resistive sheet and at least one dielectric layer. The resistive sheet has a material of construction that is a MAX phase material.

Abstract: A cover for camouflage against electromagnetic radiation. According to the invention, the cover includes a random set of puckered features in relief, these being formed by a camouflage net associated with a flexible dielectric mesh.

Abstract: A material of variable emissivity includes a first metallic layer having a first aperture, a second metallic layer having a second aperture, and a variable dielectric layer interposed between the first metallic layer and the second metallic layer.

Abstract: A radar camouflage fabric comprising a base fabric layer and a conductive garnish fabric layer attached to the base fabric layer. The conductive garnish fabric layer comprises a conductive polymer coating and a plurality of holes. The radar camouflage fabric has an average microwave transmission of less than 50% at 6-8 GHz and the conductive garnish fabric layer has an electrical surface resistance less than the electrical surface resistance of the base fabric layer.

Abstract: One aspect relates to camouflaging an object by affecting a presentation at least partially using at least one positional element based at least in part on a position of the at least one positional element. Another aspect relates to configuring at least a first camouflage positional element and at least a second camouflage positional element to act as a decoy presentation, an active chaff, and/or a smart chaff. Another aspect relates to providing at least one positional element that can deceive, confuse, defeat, or lead one or more sensors towards or away from a target, such as to act as chaff, one or more flares, fog, one or more decoys, or a combination thereof. Another aspect relates to determining a suitable camouflage for at least one camouflage positional element at least partially considering a background for the at least one camouflage positional element, and affecting a presentation using the at least one camouflage positional element at least partially based on the suitable camouflage.

Abstract: A radar camouflage fabric comprising a base fabric layer and a conductive garnish fabric layer attached to the base fabric layer. The conductive garnish fabric layer comprises a conductive polymer coating and a plurality of holes. The radar camouflage fabric has an average microwave transmission of less than 50% at 6-8 GHz and the conductive garnish fabric layer has an electrical surface resistance less than the electrical surface resistance of the base fabric layer.

Abstract: Various embodiments provide systems and methods for fabricating composite laminate structures with co-laminated radar absorbing material. An example embodiment includes providing a component part fabricated from composite laminate and having an inside surface and an outside surface; providing a portion of radar absorbing material (RAM) having an inside surface and an outside surface; positioning the outside surface of the component part against the inside surface of the portion of RAM to form an assembly; and applying pressure to the assembly thereby causing the portion of RAM to bond to the outside surface of the component part.

Abstract: An infrared camouflage coating system for application to the strategic surfaces of jet engine components comprised of a metal alloy substrate having an oxidized surface and a ferrous sulfide containing silicate glass bonded thereto.

Abstract: A camouflage coating system for application to the surfaces of jet engine components in order to reduce their level of emitted energy there by rendering them undetectable by infrared detection systems. The camouflage coating comprises a multilayer system having a first diffusion barrier of nickel aluminide applied to the substrate surface. A second silver reflective layer superimposed on the diffusion barrier layer and a glass-ceramic protective overlay superimposed on the silver reflective layer.

Abstract: A reflective layer for attenuating electromagnetic radiation, the layer comprising at least one reflective component, the latter being selected from the group containing the following substances: carbon particles or fibers, in particular carbon black and/or graphite and/or an electrically conductive graphite compound, metal particles and/or fibers, in particular copper, aluminum, steel, titanium and/or iron particles of fiber and metal alloy particles. The reflective layer is characterized in that it attenuates electromagnetic radiation in a 200Hz to 10 Ghz range by more than 10Db, that it is watertight and permeable to water vapor, in addition to being resistant to the elements and designed to produce a potential compensation. The invention also relates to a method for assembling the reflective layer.

Abstract: The present invention provides an all-weather radio wave absorber having reflector capable of smoothly attenuating harmful microwave or millimeter wave from 400 MHz to 100 GHz generated from various electronic devices so that bad effects on human body or electronic device can be eliminated. The all-weather radio wave absorber having reflector comprises a laminated radio wave absorbing composite comprising a foamed upper radio wave absorber 1 with a rugged surface or a flat surface including conductive particles such as carbon particles, ferrite particles or the like in continuous foams 2 formed therein, one or more foamed intermediate planar radio wave absorbers 3 including conductive particles such as carbon particles 7, ferrite particles or the like in continuous foams 2 formed therein, a thin radio wave reflector 4 at the bottom, and a flexible cover for wrapping the laminated absorbers and reflector together.

Abstract: A radar wave camouflage structure is disclosed. The radar wave camouflage structure comprises a substrate; a first layer on the substrate, comprising a first polymer matrix; magnetic nanoparticles dispersed in the first polymer matrix, wherein the magnetic nanoparticles comprise a mixture of Fe3O4, Fe3O4-4C carbide, Fe3O4—Ni composite and Fe2O3; a second layer on the first layer, comprising a second polymer matrix; and carbon black dispersed in the second polymer matrix.

Abstract: A radar wave camouflage structure is disclosed. The radar wave camouflage structure comprises a substrate; a first layer on the substrate, comprising a first polymer matrix; magnetic nanoparticles dispersed in the first polymer matrix, wherein the magnetic nanoparticles comprise a mixture of Fe3O4, Fe3O4—4C carbide, Fe3O4—Ni composite and Fe2O3; a second layer on the first layer, comprising a second polymer matrix; and carbon black dispersed in the second polymer matrix.

Abstract: An antenna structure including an antenna 10 with an outer main surface 11, where said antenna 10 is integrated in a surface of a surrounding material 20. Further comprising a transition zone 30 arranged along the perimeter of the main surface 11 and overlapping the main surface, where the transition zone 30 comprises a layer of a resistive material with a resistivity that varies with the distance from an outer perimeter of the transition zone 30 to enable a smooth transition of the scattering properties between the antenna 10 and the surrounding material 20.

Abstract: A radar-absorbing panel (9) includes a honeycomb core (11) and a lower skin (13), where the lower skin (13) is attached to the bottom of the honeycomb core (11). The honeycomb core (11) is made up of individual cells (15), which may be filled with aerogel. The individual cells (15) are approximately ½ of an inch in size with polygonal shape.

Abstract: The panes (1) of a naval vessel or military vehicle are often coated with a radar-reflecting layer (20) for reduction of the radar signature of the vessel/vehicle. At the same time this layer increases an enemy's possibility of recognizing the vessel in passive IR reconnaissance since the layer increases the reflectance also for IR radiation to a considerable extent. As a result, the intensity of IR radiation that an enemy receives from the panes is much lower than that from the rest of the vessel, which with signal processing can be used to increase the possibility of recognizing the vessel. According to the invention, it is suggested that the panes (1) on the outer face (8) also have a second layer (21, 22) to increase emittance especially within the IR range 2-20 ?m which is normally used for reconnaissance and the like. This second layer (21, 22) comprises especially two coatings, one of which is active in the IR range 3-5 ?m and the second in the IR range 7-14 ?m.

Abstract: A one-way reflective sensor shield with an increased bandwidth meta-materials coating is provided which substantially reduces or eliminates deleterious electronic signatures and backscattering. The one-way reflective sensor shield with meta-materials coating operates according to surface plasmonic coupling phenomena and achieves a mirror-like one-way reflection of electromagnetic signals. In this arrangement, the meta-materials coating is composed of a dielectric material, and the corrugated metal strips are composed of a metallic conductive material with a negative dielectric constant, to allow surface plasmonic coupling between the plasma in the metal and the incident electromagnetic field. Surface plasmons occur at the interface of a material with a positive dielectric constant, such as dielectric surface, with that of a negative dielectric constant, usually a metal or doped dielectric, such as the metal strips. Sensor devices and sensor shielding systems are also provided.

Abstract: A camouflage device for camouflaging specularly reflecting surfaces of an object is formed with function elements for influencing the reflection of radiation from an assumed radiation source. Each function element forms a part of an outer layer and has a pair of individual surfaces on its side facing the radiation source. The individual surfaces extend longitudinally side-by-side, and their surfaces are arranged at an angle to one another. The camouflaging device is arrangeable on the object by means of a mechanism such that it is disposed in front of the reflecting surface; and the angular arrangement of the respectively assigned individual surfaces extends such that the surface normal of a first individual surface is sloped downward, and the surface normal of a second individual surface points more steeply than 80° to the horizontal plane, and their surface courses form an angle of <90° with respect to one another.

Abstract: A case for a portable terminal using a color liquid crystal uses a Peltier device to vary the color of the case by means of electrical heating and cooling the interior of the case. The case includes a temperature control apparatus for emitting electrical heat, when an electrical current is applied thereto, and simultaneously cooling the opposite side; a liquid crystal application agent positioned on the upper portion of the temperature control apparatus and adapted to vary the color by means of the electrical heat; and a cooling unit positioned opposite to an upper portion of the temperature control apparatus to cool heat-generating devices inside the terminal.

Abstract: An apparatus for adaptive camouflage with independent control of both temperature and apparent color. The apparatus has cells or individual pixels behind a transparent outer layer. The temperature of the outer layer is controlled by a heat transfer fluid flowing in a closed circuit in each cell, the fluid being cooled or heated by Pelletier elements located behind the assembly. Color changes can be activated separately at the back of the transparent layer by the rotation of metallic triangles whose sides are covered with various color paints, the triangles being located behind the transparent layer. Radar absorption is obtained by the transparent layer and heat transfer fluid and by the selective orientation of the metallic triangles in various directions. The apparent signature of the assembly can then be varied by adapting the signature of the various cells to current environmental conditions when background conditions alter.

Abstract: Described herein is a method and system for providing a countermeasure against laser detection systems using nanocomponent material that is tailored to cloak or obscure a target from detection by transmitted laser radiation. The nanodot material absorbs and/or down-converts the transmitted laser radiation. Similarly, described herein is a method and system for providing a countermeasure against laser systems intended to blind a target through the use of a specifically engineered nanocomponent material for absorbing and/or down-converting the radiation from the laser system.

Abstract: Disclosed is a device for eliminating electromagnetic waves which consists essentially of an electromagnetic-wave trapping means comprising mainly a coil, and a discharge means made on the opposite end to the basement of the trapping means, wherein the coil having a diameter which gradually decreases from the basement to the opposite end of the trapping means.

Abstract: Adaptive modification of surface properties such as color, temperature and reflective properties by adjustably varying the temperature of a surface perceived by an observer, utilizing Peltier devices at the surface for temperature adjustment.

Abstract: The present invention is a multi-piece barrel shroud which provides IR signature and radar backscatter reduction over the entire length of the barrel by utilization of special radar absorbing materials and shaped in accordance with commonly known radar signature reduction techniques. The interior of the shroud includes cooling passages for the circulation of ambient air by way of a forced air circulation system which provides IR reduction. To facilitate barrel movement while minimizing weight, the majority of the shroud is stationary and is independent of the gun barrel. At least one other piece of the shroud is attached to the barrel near the muzzle end and designed to move in unison with the muzzle during recoil. The recoiling portion of the shroud is sized to mate with an annular recess within the distal end of the stationary portion so as to provide continuous shielding of the barrel throughout the entire range of recoil displacement.

Abstract: A rapidly deployable camouflage device for concealing recognizable signatures of military objects, comprising a camouflage balloon (1) and a deployment and undeployment device, the latter being equipped with a housing (2) and a fan (3) for inflating the balloon (1) arranged on an opening (4) in the housing. According to the invention, the balloon can be pulled into the housing by means of pull lines (7) secured at one end to the inside of the balloon opposite the opening (4), and at the other end to a motor-driven winding device inside the housing (2). The balloon is thus pulled in in such a way that it is reversed inside the housing, from which state if can then be blown out unreversed as rapidly deployable camouflage.