CN114179466A - Stealthy paster - Google Patents

Stealthy paster Download PDF

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Publication number
CN114179466A
CN114179466A CN202111366241.4A CN202111366241A CN114179466A CN 114179466 A CN114179466 A CN 114179466A CN 202111366241 A CN202111366241 A CN 202111366241A CN 114179466 A CN114179466 A CN 114179466A
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CN
China
Prior art keywords
layer
stealth
infrared
microwave
camouflage
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Pending
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CN202111366241.4A
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Chinese (zh)
Inventor
常慧聪
肖林
杨昌
贾怡
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China Academy of Space Technology CAST
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China Academy of Space Technology CAST
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Priority to CN202111366241.4A priority Critical patent/CN114179466A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/065—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of foam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
    • B32B9/005—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising one layer of ceramic material, e.g. porcelain, ceramic tile
    • B32B9/007—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising one layer of ceramic material, e.g. porcelain, ceramic tile comprising carbon, e.g. graphite, composite carbon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
    • B32B9/04—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B9/046—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material of foam
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41H—ARMOUR; ARMOURED TURRETS; ARMOURED OR ARMED VEHICLES; MEANS OF ATTACK OR DEFENCE, e.g. CAMOUFLAGE, IN GENERAL
    • F41H3/00—Camouflage, i.e. means or methods for concealment or disguise
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/10—Coating on the layer surface on synthetic resin layer or on natural or synthetic rubber layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/10—Coating on the layer surface on synthetic resin layer or on natural or synthetic rubber layer
    • B32B2255/102—Coating on the layer surface on synthetic resin layer or on natural or synthetic rubber layer synthetic resin or rubber layer being a foamed layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2266/00—Composition of foam
    • B32B2266/02—Organic
    • B32B2266/0214—Materials belonging to B32B27/00
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2266/00—Composition of foam
    • B32B2266/02—Organic
    • B32B2266/0214—Materials belonging to B32B27/00
    • B32B2266/0221—Vinyl resin
    • B32B2266/0228—Aromatic vinyl resin, e.g. styrenic (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2266/00—Composition of foam
    • B32B2266/02—Organic
    • B32B2266/0214—Materials belonging to B32B27/00
    • B32B2266/0221—Vinyl resin
    • B32B2266/0235—Vinyl halide, e.g. PVC, PVDC, PVF, PVDF
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2266/00—Composition of foam
    • B32B2266/02—Organic
    • B32B2266/0214—Materials belonging to B32B27/00
    • B32B2266/0278—Polyurethane
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/402—Coloured
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/412—Transparent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/416—Reflective
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/718—Weight, e.g. weight per square meter

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  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
  • Laminated Bodies (AREA)

Abstract

The invention relates to a stealth patch which comprises an infrared stealth layer (1), a radar absorption layer (3) and a visible light camouflage layer (2), wherein the infrared stealth layer (1) and the radar absorption layer (3) are positioned on two sides of the visible light camouflage layer (2). The invention can realize visible light, infrared and radar compatible stealth.

Description

Stealthy paster
Technical Field
The invention relates to a stealth patch.
Background
In an intelligent combat environment, military equipment is confronted with joint detection, tracking and striking of multiple detection means. With the continuous development of the photoelectric technology, the multi-band joint detection technology has become an important means for monitoring military targets. Among the various photoelectric detection technologies, visible light, infrared and radar detection account for 90%, thus providing a severe test for the pre-war viability of weaponry. Therefore, the stealth technology is an important guarantee for improving the survival capability of the weaponry in the battlefield.
In the prior art, the technology of combining visible light, infrared and radar multiband stealth is mainly composite stealth paint, and the technology compounds the paint with wave-absorbing performance and the infrared low-emissivity camouflage paint to obtain the paint with multiband compatible stealth efficiency. However, infrared stealth requires coatings with low absorption and high reflection of infrared light, while microwave (radar) stealth requires coatings with high absorption and low reflection. Therefore, the electromagnetic wave reflection characteristics of infrared and radar stealth are mutually contradictory, and infrared radar compatible stealth cannot be realized, while the inherent contradiction which is difficult to overcome by the existing multiband stealth composite coating is also difficult to overcome. Meanwhile, the optical camouflage material and the infrared low-emissivity material are required to be arranged on the surface of a target, and the mutual restriction of the optical camouflage material and the infrared low-emissivity material brings great difficulty to the preparation of the stealth material. Therefore, in order to meet the development trend of future weaponry, a multi-band compatible stealth structure needs to be designed urgently.
Disclosure of Invention
The invention aims to provide a stealth patch.
In order to achieve the purpose, the invention provides a stealth patch which comprises an infrared stealth layer, a radar absorption layer and a visible light camouflage layer, wherein the infrared stealth layer and the radar absorption layer are positioned on two sides of the visible light camouflage layer.
According to one aspect of the present invention, the radar absorption layer includes a first foam dielectric layer, a first microwave resonance structure absorption layer, a second foam dielectric layer, a second microwave resonance structure absorption layer, a third foam dielectric layer, and an electromagnetic reflection layer, which are sequentially stacked.
According to one aspect of the invention, the visible camouflage layer is formed by spraying camouflage paint on the surface of the first foam medium layer, and the infrared camouflage layer is pressed on the visible camouflage layer.
According to one aspect of the invention, the infrared stealth layer is composed of a transparent conductive film deposited on polyester resin and etched into a periodic array structure, the array shape is square, circular, rectangular or irregular, and the array period is 0.5 mm;
the infrared emissivity of the infrared stealth layer is lower than 0.3, the microwave transmittance in the range of 1-20GHz is greater than 98%, and the visible light transmittance is greater than 80%.
According to one aspect of the invention, the infrared stealth layer has a square resistance value of 1-10 Ω/sq and a thickness of not less than 150 nm;
the infrared stealth layer is made of Indium Tin Oxide (ITO), fluorine-doped tin oxide (FTO), zinc aluminum oxide (AZO) or a metal dielectric metal multilayer film.
According to one aspect of the present invention, the frequency band of the microwave absorbed by the absorption layer of the first microwave resonance structure is 2-6GHz, and the frequency band of the microwave absorbed by the absorption layer of the second microwave resonance structure is 7-18 GHz;
the absorption efficiency of the first microwave resonant structure absorption layer and the second microwave resonant structure absorption layer is greater than 0.9.
According to an aspect of the present invention, the microwave resonance structure absorption layer is composed of a resistive thin film, and is etched into a periodic pattern structure, the pattern shape being a square, a rectangle, an open loop, or an irregular shape;
the material of the microwave resonance structure absorption layer is indium tin oxide, zinc aluminum oxide, graphite flake or silver nanowire.
According to an aspect of the present invention, the square resistance value of the absorption layer of the first microwave resonance structure is 20 to 30 Ω/sq;
the square resistance value of the absorption layer of the second microwave resonance structure is 50-60 omega/sq, and the thickness is 150-200 nm.
According to one aspect of the invention, the thickness of the first foam medium layer is 1-2.5mm, the thickness of the second foam medium layer is 6-10mm, and the thickness of the third foam medium layer is 3-5 mm;
the material of the foam dielectric layer is polymethacrylimide, polyvinyl chloride, polymethacrylimide, polyurethane, polystyrene, polyetherimide or styrene acrylonitrile;
the dielectric constant of the foam dielectric layer is 1-2.
According to one aspect of the invention, the electromagnetic reflecting layer is composed of a continuous conductive film, the sheet resistance value is less than 10 Ω/sq, and the thickness is more than 150 nm;
the electromagnetic reflecting layer is made of indium tin oxide, zinc aluminum oxide, a metal copper film, a metal aluminum film, a carbon tube or graphene.
According to the concept of the invention, the high-efficiency absorption of radar waves is realized by utilizing the specific size effect of the metamaterial structure and combining the electromagnetic property of the material, and the metamaterial has the high infrared reflection property. In addition, through the combination of the transparent metamaterial structure and the visible light camouflage layer, the invisible light, infrared and radar compatible stealth can be realized. Moreover, the patch type structure is light in weight and low in cost, and can be covered on the surface of any part of the target shell of the weapon equipment to be hidden in a fitting mode on the premise of not changing the appearance of the equipment, so that the hidden requirements of the equipment under various detections are met on the premise of meeting the fighting function of the equipment.
According to one aspect of the invention, the stealth patch may achieve efficient broad-spectrum microwave absorption, low infrared emissivity, and visible camouflage on its own. The absorption range of the microwave absorber can cover 2-18GHz, and the absorption efficiency is more than 0.9. And the infrared emissivity of the surface of the patch can be lower than 0.3, so that the heat radiation quantity of the target can be obviously reduced, and the probability of being detected by an infrared detector is reduced. The optical camouflage layer can realize optical camouflage so as to be fused with the background environment.
Drawings
FIG. 1 schematically illustrates a block diagram of a stealth patch according to one embodiment of the present invention;
FIG. 2 schematically illustrates a structural array diagram of an infrared stealth layer according to one embodiment of the present invention;
FIG. 3 is a graph schematically illustrating the microwave transmission efficiency of an infrared stealth layer according to one embodiment of the present invention;
FIG. 4 schematically illustrates an infrared performance graph of an infrared stealth layer according to one embodiment of the present invention;
FIG. 5 is a graph schematically illustrating the red optical transmission of an infrared stealth layer according to one embodiment of the present invention;
FIGS. 6 and 7 are schematic views each showing a structure of two microwave resonance absorption layers according to an embodiment of the present invention;
FIG. 8 is a graph schematically illustrating the microwave absorbing performance of a stealth patch according to one embodiment of the present invention;
fig. 9 and 10 are schematic diagrams showing the absorption efficiency of transverse electric waves and transverse magnetic waves incident upon oblique incidence of the stealth patch according to one embodiment of the present invention;
fig. 11 schematically illustrates an external camouflage view of a stealth patch according to an embodiment of the present invention.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
In describing embodiments of the present invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship that is based on the orientation or positional relationship shown in the associated drawings, which is for convenience and simplicity of description only, and does not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, the above-described terms should not be construed as limiting the present invention.
The present invention is described in detail below with reference to the drawings and the specific embodiments, which are not repeated herein, but the embodiments of the present invention are not limited to the following embodiments.
Referring to fig. 1, the visible light, infrared and radar three-band compatible stealth light patch of the invention comprises an infrared stealth layer 1 and a radar absorption layer 3. In addition, a visible light camouflage layer 2 is further arranged, and the infrared stealth layer 1 and the radar absorption layer 3 are located on two sides of the visible light camouflage layer 2.
In the invention, the radar absorption layer 3 comprises a first foam medium layer 31, a first microwave resonance structure absorption layer 32, a second foam medium layer 33, a second microwave resonance structure absorption layer 34, a third foam medium layer 35 and an electromagnetic reflection layer 36 which are sequentially laminated.
The microwave resonance structure absorption layer is different periodic pattern structures formed by etching a resistor film with a specific square resistance value, the patterns can be regular or irregular structures such as squares, rectangles, open rings and the like, and the periodic structures can be used for locally positioning electromagnetic waves in the resonance periodic structures. The material of the microwave resonance structure absorption layer (namely the film) is indium tin oxide, zinc aluminum oxide, graphite flake or silver nanowire. The two microwave resonance structure absorption layers have different cycle sizes and square resistance values, wherein the first microwave resonance structure absorption layer 32 mainly absorbs low-frequency-band microwaves, namely the frequency band of the absorbed microwaves is 2-6GHz, and the square resistance value is 20-30 omega/sq; the second microwave resonance structure absorption layer 34 mainly absorbs the high-frequency range microwave, i.e. the absorbed microwave frequency range is 7-18GHz, the square resistance value is 50-60 Ω/sq, and the thickness is 150-200 nm. The whole microwave absorption range of the two microwave resonance structure absorption layers can cover 2-18GHz, and the absorption efficiency is more than 0.9. Therefore, the wide-spectrum microwave absorption can be realized by reasonably setting the square resistance value of the microwave resonance structure absorption layer and the microwave resonance absorption structure.
The foam dielectric layer is used for separating the two microwave resonance structure absorption layers and is made of Polymethacrylimide (PMI), polyvinyl chloride (PVC), Polymethacrylimide (PMI), Polyurethane (PU), Polystyrene (PS), Polyetherimide (PEI) or Styrene Acrylonitrile (SAN) and the like. Wherein the dielectric constant of the foam dielectric layer is 1-2. The thickness of the first foam medium layer 31 is 1-2.5mm, the thickness of the second foam medium layer 33 is 6-10mm, and the thickness of the third foam medium layer 35 is 3-5 mm.
The electromagnetic reflective layer 36 is a continuous (complete) transparent conductive film structure prepared on the lower surface of the foam dielectric layer for reflecting microwaves and infrared radiation. The sheet resistance value of the electromagnetic reflecting layer 36 is less than 10 omega/sq, and the thickness is not less than 150nm, so that efficient microwave reflection can be realized, and the microwave dissipation capability of the microwave resonance structure is improved. The electromagnetic reflective layer 36 is made of a carbon material such as indium tin oxide, zinc aluminum oxide, a copper metal film, an aluminum metal film, a carbon tube, or graphene.
According to the arrangement, microwaves of specific frequencies enter the first foam medium layer 31 through the selected surface, are subjected to resonance absorption with the first microwave resonance structure absorption layer 32 and the second microwave resonance structure absorption layer 34, and microwaves which are not lost enter the third foam medium layer 35 and the electromagnetic reflection layer 36, are reflected to the first microwave resonance structure absorption layer 32 and the second microwave resonance structure absorption layer 34, and most of the microwaves are lost in the radar absorption layer 3 after multiple resonance absorption.
In the invention, the visible light camouflage layer 2 is prepared on the upper surface of the uppermost first foam medium layer 31 by spraying camouflage color paint, and the transparent infrared stealth layer 1 is prepared on the visible light camouflage layer 2 (namely camouflage color coating) by pressing.
In the invention, the infrared stealth layer 1 is a transparent conductive film deposited on ultrathin polyester resin (PET) and is etched into a periodic array structure, the shape of the pattern structure can be a regular or irregular structure such as a square, a circle, a rectangle and the like, the period of the pattern structure array is 0.5mm, and after a circular pattern part of the transparent conductive film is etched, the remaining part is a frequency selection surface. Therefore, the infrared stealth layer 1 becomes a microwave frequency selection surface, namely, microwaves with specific frequencies can be selectively transmitted by adjusting the structural size parameters. In the invention, the infrared stealth layer 1 can ensure that the microwave transmittance within a frequency band of 1-20GHz is more than 98%. And the infrared emissivity of the infrared stealth layer 1 is lower than 0.3, so that the heat radiation amount of the target can be remarkably reduced to reduce the probability of being detected. The visible light transmittance of the infrared stealth layer 1 is greater than 80%, so that the performance of the optical camouflage coating below the infrared stealth layer 1 is not affected. The square resistance value of the infrared stealth layer 1 (transparent conductive film) is 1-10 omega/sq, and the thickness is not less than 150nm, so that the infrared stealth layer has high conductivity, and the infrared stealth layer has low infrared emissivity and high optical transmittance. The infrared stealth layer 1 is made of transparent thin films such as Indium Tin Oxide (ITO), fluorine-doped tin oxide (FTO), Aluminum Zinc Oxide (AZO) or metal dielectric metal multilayer film (DMD).
The stealth patch of the present invention is described in detail below in one embodiment:
referring to fig. 1, in the present embodiment, the infrared stealth layer 1 is formed by roll-to-roll magnetron sputtering, and 150nm ITO is sputtered on a transparent PET film of 75-175um, and the dielectric constant of the PET material is 3.0(1-0.001 i). The infrared stealth layer 1, the first microwave resonant structure absorption layer 32, and the second microwave resonant structure absorption layer 34 are also laser etched. The visible light camouflage layer 2 is prepared on the upper surface of the first foam medium layer 31 through a spraying process. The foam dielectric layer separates the functional layers and has a dielectric constant of about 1.12(1-0.001 i). The thickness of the first foam medium layer 31 was 1.7mm, the thickness of the second foam medium layer 33 was 9.8mm, and the thickness of the third foam medium layer 35 was 4.7 mm. The PMI foam has the characteristic of low density, and simultaneously can keep better mechanical property, is not easy to deform and influences the microwave absorption performance. In addition, the foam material has low heat conductivity coefficient, and can reduce the heat conduction of the target to the infrared stealth layer so as to further reduce the probability that the target is detected.
Referring to fig. 2, the infrared stealth layer 1 has a structure in which a combination of a lower disc and a rhomboid pattern is left after etching away a ring structure. Wherein, the structural parameter g is 0.05mm, r is 0.45mm, and the duty ratio of the pattern is calculated to reach 90.8%. In this embodiment, the infrared stealth layer 1 is made of Indium Tin Oxide (ITO) with a square resistance of 8 Ω/sq and a film thickness of 200 nm. The microwave characteristic of the patch structure is simulated and calculated based on CST STUDIO.
Referring to the microwave transmission efficiency of the infrared stealth layer 1 shown in fig. 3, the microwave frequency selective surface structure array has a low-pass high-impedance filter characteristic, and can ensure that the microwave transmittance of 1-20GHz is more than 98%, and the infrared emissivity is measured by an infrared camera (model PI640Optris Inc) with a spectral range of 7.5-13 μm.
See fig. 4 for an infrared stealth effect of the infrared stealth layer 1. When the temperature of the heating plate is 70 ℃, the infrared temperature of the surface of the infrared stealth layer 1 is 35 ℃, the infrared temperature of the ITO of the control group is 31 ℃, the theoretical calculated value of the infrared emissivity is 0.25, and the experimentally measured emissivity value is 0.28.
Referring to the optical transmittance of the infrared stealth layer 1 shown in fig. 5, in the visible light wavelength range of 380-730, the transmittance is greater than 82%, and the high optical transmittance does not affect the color effect of the underlying optical camouflage layer.
Referring to fig. 6 and 7, the first microwave resonance structure absorption layer 32 is made of Indium Tin Oxide (ITO), has a square resistance of 26 Ω/sq, a film thickness of about 200nm, an array period of 5mm, and a period of l1＝24.5mm，w12.3 mm; the second microwave resonance structure absorption layer 34 is made of Indium Tin Oxide (ITO) with a square resistance of 55 Ω/sq, a film thickness of about 200nm, an array period of 31mm, and a2＝4.7mm，w2＝0.5mm。
In the present embodiment, the thickness of the first foam medium layer 31 is 1.7mm, the thickness of the second foam medium layer 33 is 9.8mm, and the thickness of the third foam medium layer 35 is 4.8 mm. The square resistance of the electromagnetic reflecting layer 36 is 10 Ω/sq.
Referring to fig. 8, the stealth patch structure has a microwave absorption efficiency of more than 90% in the range of 2-18GHz at normal incidence, the first microwave resonance structure absorption layer 32 mainly absorbs 1.8GHz to 6GHz, and the second microwave resonance structure absorption layer 34 mainly absorbs microwaves of the 6-18.5GHz band.
Referring to fig. 9 and 10, the absorption efficiency changes when the incident angle increases from 0 ° to 60 ° in both the transverse electric wave and transverse magnetic wave polarization modes. Because the square ring structure is a symmetrical structure, the patch structure is insensitive to the polarization direction of an electric field when the patch structure is vertically incident, and the absorption efficiency of the two polarization states is the same. When the oblique incidence angle is increased, the absorption efficiency of the patch structure to the transverse electric wave and the transverse magnetic wave is different. But within 45 degrees, the patch structure can still keep 85% absorption efficiency for microwaves with two polarization modes; within 60 deg., the patch structure can still maintain greater than 80% absorption performance over most of the wavelength band.
Referring to fig. 11, the paint sprayed on the visible light camouflage layer 2 is a jungle camouflage color matching, and mainly comprises three colors of light green, dark green and brown. At this time, the infrared stealth layer 1 is a transparent film layer, and the whole body also presents camouflage color.
The above description is only one embodiment of the present invention, and is not intended to limit the present invention, and it is apparent to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The stealth patch comprises an infrared stealth layer (1) and a radar absorption layer (3), and is characterized by further comprising a visible light camouflage layer (2), wherein the infrared stealth layer (1) and the radar absorption layer (3) are located on two sides of the visible light camouflage layer (2).
2. The stealth patch according to claim 1, characterized in that the radar absorbing layer (3) comprises a first foam dielectric layer (31), a first microwave resonant structure absorbing layer (32), a second foam dielectric layer (33), a second microwave resonant structure absorbing layer (34), a third foam dielectric layer (35) and an electromagnetic reflecting layer (36) stacked in this order.
3. The camouflage patch according to claim 2, wherein the visible light camouflage layer (2) is formed by spraying camouflage paint on the surface of the first foam medium layer (31), and the infrared camouflage layer (1) is pressed on the visible light camouflage layer (2).
4. The stealth patch according to claim 1, wherein the infrared stealth layer (1) is composed of a transparent conductive film deposited on a polyester resin and etched into a periodic array structure, the array shape being square, circular, rectangular or irregular, the array period being 0.5 mm;
the infrared emissivity of the infrared stealth layer (1) is lower than 0.3, the microwave transmittance in the range of 1-20GHz is greater than 98%, and the visible light transmittance is greater than 80%.
5. The stealth patch according to claim 1, characterized in that the infrared stealth layer (1) has a square resistance value of 1-10 Ω/sq and a thickness of not less than 150 nm;
the infrared stealth layer (1) is made of Indium Tin Oxide (ITO), fluorine-doped tin oxide (FTO), Aluminum Zinc Oxide (AZO) or a metal dielectric metal multilayer film.
6. The stealth patch according to claim 2, characterized in that the first microwave resonant structure absorption layer (32) absorbs microwaves in the range of 2-6GHz and the second microwave resonant structure absorption layer (34) absorbs microwaves in the range of 5-18 GHz;
the absorption efficiency of the first microwave resonant structure absorption layer (32) and the second microwave resonant structure absorption layer (34) is greater than 0.9.
7. The stealth patch according to claim 2, wherein the microwave resonance structure absorbing layer is composed of a resistive thin film and is etched in a periodic pattern structure, the pattern shape being a square, rectangle, open loop or irregular shape;
the material of the microwave resonance structure absorption layer is indium tin oxide, zinc aluminum oxide, graphite flake or silver nanowire.
8. The stealth patch according to claim 2, characterized in that the square resistance value of the first microwave resonant structure absorption layer (32) is 20-30 Ω/sq;
the square resistance value of the second microwave resonance structure absorption layer (34) is 50-60 omega/sq, and the thickness is 150-200 nm.
9. The stealth patch according to claim 2, characterized in that the thickness of the first foam medium layer (31) is 1-2.5mm, the thickness of the second foam medium layer (33) is 6-10mm, and the thickness of the third foam medium layer (35) is 3-5 mm;
the material of the foam dielectric layer is polymethacrylimide, polyvinyl chloride, polymethacrylimide, polyurethane, polystyrene, polyetherimide or styrene acrylonitrile;
the dielectric constant of the foam dielectric layer is 1-2.
10. The stealth patch according to claim 2, characterized in that said electromagnetic reflection layer (36) is constituted by a continuous conductive film, having a sheet resistance value of less than 10 Ω/sq, and a thickness of not less than 150 nm;
the electromagnetic reflecting layer (36) is made of indium tin oxide, zinc aluminum oxide, a metal copper film, a metal aluminum film, a carbon tube or graphene.
CN202111366241.4A 2021-11-18 2021-11-18 Stealthy paster Pending CN114179466A (en)

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CN114806499A (en) * 2022-05-30 2022-07-29 中国人民解放军陆军工程大学 Stealth covering film for storage shelter in plateau alpine region and preparation method thereof
CN115077302A (en) * 2022-08-18 2022-09-20 合肥中隐新材料有限公司 Radar stealth external member based on metamaterial
WO2023181016A1 (en) * 2022-03-20 2023-09-28 Ametrine Technologies Ltd. Modular camouflage system and uses thereof

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CN110737035A (en) * 2019-10-22 2020-01-31 中国人民解放军国防科技大学 stealth materials compatible with selective infrared radiation and radar wave absorption and preparation method thereof
CN112549665A (en) * 2020-12-04 2021-03-26 中国人民解放军96901部队25分队 Radar-infrared-visible light multi-spectrum camouflage stealth structure and preparation method thereof
CN112622391A (en) * 2020-11-02 2021-04-09 中国人民解放军空军工程大学 Optical transparent ultra-wideband radar and infrared double-stealth structure

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CN110737035A (en) * 2019-10-22 2020-01-31 中国人民解放军国防科技大学 stealth materials compatible with selective infrared radiation and radar wave absorption and preparation method thereof
CN112622391A (en) * 2020-11-02 2021-04-09 中国人民解放军空军工程大学 Optical transparent ultra-wideband radar and infrared double-stealth structure
CN112549665A (en) * 2020-12-04 2021-03-26 中国人民解放军96901部队25分队 Radar-infrared-visible light multi-spectrum camouflage stealth structure and preparation method thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023181016A1 (en) * 2022-03-20 2023-09-28 Ametrine Technologies Ltd. Modular camouflage system and uses thereof
CN114806499A (en) * 2022-05-30 2022-07-29 中国人民解放军陆军工程大学 Stealth covering film for storage shelter in plateau alpine region and preparation method thereof
CN115077302A (en) * 2022-08-18 2022-09-20 合肥中隐新材料有限公司 Radar stealth external member based on metamaterial
CN115077302B (en) * 2022-08-18 2022-11-04 合肥中隐新材料有限公司 Radar stealth external member based on metamaterial

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