CN114454584A - Transparent flexible infrared and radar composite low detectable material and preparation method thereof - Google Patents
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Abstract
The invention relates to the technical field of low detectable materials, in particular to a transparent flexible infrared and radar composite low detectable material and a preparation method thereof. The radar antenna consists of an infrared low-radiation functional layer and a radar absorption layer, wherein the infrared low-radiation functional layer is a visible light transparent high-frequency band-pass low-frequency cut-off frequency selection surface, and the radar absorption layer comprises a transparent dielectric layer and a transparent conductive layer. The composite low-detectable material disclosed by the invention is simple in structure, low in cost and convenient to manufacture, and the visible light transmission characteristic is increased on the basis of infrared and radar composite low-detectable, so that the radar absorption frequency band is widened, and the application of the composite low-detectable material in the low-detectable field is further expanded.
Description
Technical Field
The invention relates to the technical field of low detectable materials, in particular to a transparent flexible infrared and radar composite low detectable material and a preparation method thereof.
Background
The single low-detectable means cannot meet the mature multi-band detection threat, wherein the infrared and radar composite detection protective material is the development direction of the current low-detectable material. The infrared low detectable material is a high-reflection low-absorption material and contradicts with the traditional radar absorption material, and the two materials have compatibility difficulty.
The traditional infrared and radar compatible low detectable means is that a layer of infrared low emissivity coating material is sprayed on the surface of a radar absorption material, which has great influence on the radar absorption performance of the inner side. Meanwhile, the color of the two compatible objects is far from the original color of the protected object, and the visible light characteristic of the protected object is damaged. Along with the development of novel artificial electromagnetic materials, the infrared frequency selection surface of the top layer is artificially designed, so that the problem that infrared and radar compatibility is difficult in the traditional technology can be well solved.
Chinese patent CN102179968A discloses a radar and infrared compatible stealth material and a preparation method thereof, the compatible stealth material is mainly composed of a radar wave-absorbing structure layer and an infrared stealth function layer, the radar wave-absorbing structure layer is made of glass fiber reinforced plastic composite materials, and the infrared stealth function layer is a capacitive frequency selection surface. The preparation method of the invention is that firstly, the capacitive frequency selection surface is prepared by the PCB technology; preparing a layer of resistance card on the glass fiber plain cloth by using conductive carbon paste through a screen printing process; and then, preparing a glass fiber reinforced plastic composite material by using epoxy resin as a base material and glass fiber plain cloth as a reinforcing material through a resin molding process, and finally, performing curing molding to perform surface composite superposition on the capacitive frequency selection to prepare the radar and infrared compatible stealth material.
Chinese patent CN106427115A discloses a high-temperature resistant radar infrared compatible stealth material based on a double-layer metamaterial and a preparation method thereof, wherein the high-temperature resistant radar infrared compatible stealth material based on the double-layer metamaterial is of a layered structure and sequentially comprises a dielectric layer I, a resistance type high-temperature metamaterial layer, a dielectric layer II, a modification layer and a frequency selection surface layer from inside to outside; wherein the dielectric layer I and the dielectric layer II are both oxide fiber reinforced oxide-based composite materials; the resistance type high-temperature metamaterial layer mainly comprises a high-temperature resistance coating in a periodic pattern; the decorative layer is a glass coating; the frequency selective surface layer is mainly composed of a noble metal coating which is in a periodic pattern and has high temperature resistance, oxidation resistance and low infrared emissivity.
Chinese patent CN106007799A discloses a radar and infrared compatible stealth material based on a double-layer frequency selective surface and a preparation method thereof, wherein the radar and infrared compatible stealth material is a layered structure, and comprises a dielectric substrate layer, a resistive capacitive frequency selective surface layer, a middle dielectric layer and a metallic capacitive frequency selective surface layer from inside to outside in sequence. The preparation method comprises the steps of selecting and preparing the medium substrate layer, preparing the resistance type and capacitive frequency selection surface layer on the medium substrate layer by adopting a screen printing process, preparing the intermediate medium layer on the resistance type and capacitive frequency selection surface layer by adopting a brush coating process, preparing the metal coating on the intermediate medium layer by adopting a physical deposition process, etching the metal coating into the frequency selection surface by adopting a laser process, and completing the preparation of the radar and infrared compatible stealth material.
Chinese patent CN 106116585A discloses a high temperature resistant radar and infrared compatible stealth material and a preparation method thereof, the stealth material is a layered structure and mainly comprises a silicon carbide composite material layer, an oxidation resistant modification layer and a metal frequency selective surface layer from inside to outside; wherein, the anti-oxidation modification layer is a cordierite glass coating, and the metal frequency selection surface layer mainly comprises a high-temperature-resistant and anti-oxidation metal coating in a periodic pattern. The preparation method comprises the following steps: preparing a silicon carbide composite material layer by adopting a precursor impregnation cracking process; uniformly brushing cordierite glass slurry on the surface of the silicon carbide composite material layer by adopting a brushing process, and preparing an antioxidant modification layer on the surface of the silicon carbide composite material; and preparing a metal coating on the anti-oxidation modification layer by adopting a physical deposition process, and finally etching the metal coating into a frequency selective surface by adopting a laser etching process to finish the preparation of the radar and infrared compatible stealth material.
Chinese patent CN103158299A discloses a radar and infrared compatible stealth material and a preparation method thereof, the stealth material sequentially comprises a metal type capacitive frequency selective surface layer, a middle dielectric layer, a resistance type capacitive frequency selective surface layer and a dielectric substrate layer from top to bottom; the metal type and resistance type capacitive frequency selection surface layers are of matrix structures, and the metal selected by the metal type capacitive frequency selection surface layer is metal with low infrared emissivity; the dielectric constants of the intermediate dielectric layer and the dielectric substrate layer are 3-10, and the dielectric loss is 0.01-0.50; the preparation of the stealth material mainly comprises the following steps: the method comprises the steps of firstly preparing a metal film layer by adopting processes such as silk screen printing and the like, then etching a metal capacitive frequency selection surface layer on the metal film layer by adopting a PCB (printed Circuit Board) process and the like, then preparing a resistance capacitive frequency selection surface layer on a medium basal layer by adopting the silk screen printing process, and finally bonding the resistance capacitive frequency selection surface layer and the medium basal layer into a whole by adopting a vacuum bag pressing method through a bonding agent.
Chinese patent CN 111585041a discloses a radar/infrared compatible stealth super surface, which comprises a conductive reflecting layer, a dielectric layer and a conductor film functional layer sequentially arranged from bottom to top; the conductor film functional layer is of an M multiplied by M array structure of a patch large unit I and a patch large unit II; the patch large unit I is n composed of patch small units I1×n1The patch large unit II is n composed of patch small units II2×n2The array structure of (1); wherein M is an even number; the size of the patch big unit I is the same as that of the patch big unit II, and the number of the patch big units is the same; the patch small unit I and the patch small unit II are different in size.
Although the stealth material disclosed in the above patent can be better compatible with radar and infrared, the radar has a limited radar absorption band, does not have a broadband effect, does not have a visible light transparency characteristic, cannot be compatible with a visible light low detectable property, and is not beneficial to further expanding the protection performance of the material; the materials are hard materials and are not suitable for being attached to an irregular surface.
At present, it is needed to provide a stealth material that is compatible with radar and infrared and has visible light transmission characteristics.
Disclosure of Invention
The invention aims to provide a transparent and flexible infrared and radar composite low detectable material, which has the infrared and radar composite low detectable characteristic and the visible light transmission characteristic, and widens the radar absorption frequency band; the invention also provides a preparation method thereof.
The transparent flexible infrared and radar composite low detectable material consists of an infrared low-radiation functional layer and a radar absorption layer, wherein the infrared low-radiation functional layer is a visible light transparent high-frequency band-pass low-frequency cut-off frequency selection surface, and the radar absorption layer comprises a transparent dielectric layer and a transparent conductive layer.
Wherein:
the frequency selection surface of the visible light transparent high-frequency band-pass low-frequency cut-off is made of an ITO conductive thin film material. The ITO conductive film material takes a transparent flexible substrate PET as a base, and the thickness of the base is 0.1 mm-0.2 mm, preferably 0.175 mm.
The sheet resistance of the frequency selection surface of the visible light transparent high-frequency band-pass low-frequency cut-off is 5-8 omega/sq, the unit period is 0.35-0.75 mm, and the gap width is 0.04-0.08 mm.
The radar absorption layer is sequentially provided with a first transparent medium layer, a first transparent conducting layer, a second transparent medium layer and a second transparent conducting layer from top to bottom, and the first transparent conducting layer is provided with circular array absorption structures.
The first transparent medium layer and the second transparent medium layer are both made of PVC materials. The dielectric constants of the first transparent dielectric layer and the second transparent dielectric layer are both 2.5-4.5, and the thicknesses of the first transparent dielectric layer and the second transparent dielectric layer are both 2 mm-4 mm.
The first transparent conducting layer and the second transparent conducting layer are both made of transparent ITO (indium tin oxide) conducting thin film materials. The square resistance of the first transparent conducting layer is 40-80 omega/sq, and the square resistance of the second transparent conducting layer is 5-8 omega/sq; a plurality of circular array absorption structures are arranged on the first transparent conductive layer.
The preparation method of the transparent flexible infrared and radar composite low detectable material comprises the following steps:
(1) preparing an infrared low-radiation functional layer by adopting a laser etching process: etching the ITO transparent conductive film material in the infrared low-radiation functional layer in an etching mode, only etching the ITO transparent conductive film material part, not etching through the transparent flexible substrate PET, and obtaining a visible light transparent high-frequency band-pass low-frequency cut-off frequency selection surface with gaps;
(2) etching the first transparent conductive layer in the radar absorption layer by adopting a laser etching mode according to a preset etching pattern to obtain a plurality of first transparent conductive layers of the circular array absorption structure;
(3) and (3) sequentially compounding an infrared functional layer and a radar absorption layer by adopting transparent optical curing glue, sequentially compounding an infrared low-radiation functional layer, a first transparent dielectric layer, a first transparent conducting layer, a second transparent dielectric layer and a second transparent conducting layer, and finally, curing to obtain the transparent flexible infrared and radar composite low detectable structure.
Wherein the curing temperature is 50-60 ℃.
The invention has the following beneficial effects:
the transparent flexible infrared and radar composite low detectable material consists of an infrared low-radiation functional layer and a radar absorption layer, wherein the radar absorption layer is sequentially provided with a first transparent dielectric layer, a first transparent conducting layer, a second transparent dielectric layer and a second transparent conducting layer from top to bottom. The arrangement of the second transparent conducting layer in the radar absorption layer can prevent the transmission of radar waves and has a reflection effect; the arrangement of the first transparent medium layer, the first transparent conducting layer and the second transparent medium layer, the sequencing effect of the medium, the conducting layer and the medium is the result after optimization according to simulation design, the radar absorption structure is favorable for forming a proper impedance matching effect on incident radar waves, the transmission and absorption effects of the incident radar waves are favorable for enhancing, and further the protection bandwidth of the radar is improved.
The transparent flexible infrared and radar composite low detectable material is compatible with infrared and radar low detectable performance, has visible light transmission characteristics, can realize visible light compatible low detectable effect, has certain flexible characteristics, and can be used for irregular surfaces.
The transparent flexible infrared and radar composite low detectable material has broadband radar wave absorption performance, can be used for ensuring that the radar reflectivity is lower than-10 dB under a mainstream radar frequency band of 4-18 GHz, and has the characteristics of angle insensitivity and polarization insensitivity, because the first transparent conducting layer in the radar absorption layer is provided with a symmetrical n x n circular array, incident radar waves can cause charges near the circle to move to form displacement current, and the absorption and dissipation of electromagnetic wave energy are caused. The conventional absorption structure has no special patterning process and has a limited absorption bandwidth.
The preparation process of the transparent and flexible infrared and radar composite low detectable material is relatively simple, the laser etching technology is mature, and the compatible low detectable material can be prepared by using the existing equipment, so that the large-scale production and application are easy, and the practical application of the radar and infrared compatible material is realized.
The composite low-detectable material disclosed by the invention is simple in structure, low in cost and convenient to manufacture, and the visible light transmission characteristic is increased on the basis of infrared and radar composite low-detectable, so that the radar absorption frequency band is widened, and the application of the composite low-detectable material in the low-detectable field is further expanded.
Drawings
FIG. 1 is a schematic view of the overall structure of the transparent flexible infrared and radar composite low detectable material of the present invention;
FIG. 2 is a schematic structural view of an infrared low-emissivity functional layer in example 1 of the present invention;
fig. 3 is a schematic structural view of a circular array on a first transparent conductive layer in a radar absorbing layer in embodiment 1 of the present invention;
FIG. 4 is a radar wave reflection curve in example 1 of the present invention;
FIG. 5 is a radar wave reflection curve in example 2 of the present invention;
FIG. 6 is a radar wave reflection curve in example 3 of the present invention;
fig. 7 is a radar wave reflection curve in comparative example 1 of the present invention.
Detailed Description
The present invention is further described below with reference to examples.
The transparent flexible infrared and radar composite low detectable material is composed of an infrared low-radiation functional layer and a radar absorption layer, as shown in fig. 1, wherein the infrared low-radiation functional layer is called the infrared functional layer for short; the infrared low-radiation functional layer is a visible light transparent high-frequency band-pass low-frequency cut-off frequency selection surface, and the radar absorption layer is sequentially provided with a first transparent dielectric layer, a first transparent conductive layer, a second transparent dielectric layer and a second transparent conductive layer from top to bottom.
The infrared low-radiation functional layer is subjected to laser etching treatment to form a frequency selective surface with a certain gap structure, and the frequency selective surface has high transmission capability of an infrared low-radiation radar, and the schematic structural diagram of the frequency selective surface is shown in FIG. 2;
the first transparent conductive layer of the radar absorption layer is provided with an n × n circular array, and an incident radar wave causes charges near the circle to move to form displacement current, so that the absorption and dissipation of electromagnetic wave energy are caused, and the structural schematic diagram is shown in fig. 3.
Example 1
The composite low detectable material consists of a transparent flexible infrared and radar composite low detectable material, an infrared low radiation functional layer and a radar absorption layer;
the infrared low-radiation functional layer is a visible light transparent high-frequency band-pass low-frequency cut-off frequency selection surface and is made of an ITO (indium tin oxide) conductive thin film material with low resistance, the sheet resistance is 5 omega/sq, the unit period is 0.5mm, and the gap width is 0.05 mm; the ITO conductive film material takes a transparent flexible substrate PET as a base, and the thickness of the base is 0.175 mm;
the radar absorption layer is sequentially provided with a first transparent medium layer, a first transparent conducting layer, a second transparent medium layer and a second transparent conducting layer from top to bottom. The first transparent medium layer and the second transparent medium layer are both made of PVC materials, the dielectric constants are both 2.8, and the thicknesses are both 3 mm; the first transparent conducting layer and the second transparent conducting layer are made of transparent ITO (indium tin oxide) conducting thin film materials, the square resistance of the first transparent conducting layer is 50 omega/sq, and the square resistance of the second transparent conducting layer is 5 omega/sq. The first transparent conductive layer is provided with a 2 x 2 circular array of absorbing structures.
The preparation method of the transparent flexible infrared and radar composite low detectable material comprises the following steps:
(1) preparing an infrared low-radiation functional layer by adopting a laser etching process: etching the ITO transparent conductive film material in the infrared low-radiation functional layer in an etching mode, only etching the ITO transparent conductive film material part, not etching through the transparent flexible substrate PET, and obtaining a visible light transparent high-frequency band-pass low-frequency cut-off frequency selection surface with a gap (the gap width is 0.05 mm);
(2) etching a first transparent conductive layer in the radar absorption layer by adopting a laser etching mode according to a preset etching pattern to obtain a plurality of circular array absorption structures, wherein the first transparent conductive layer is made of an ITO transparent conductive film material with the sheet resistance of 50 omega/sq;
(3) and (3) sequentially compounding an infrared functional layer and a radar absorption layer by adopting transparent optical curing glue, sequentially compounding an infrared low-radiation functional layer, a first transparent dielectric layer, a first transparent conducting layer, a second transparent dielectric layer and a second transparent conducting layer, and finally performing low-temperature curing treatment at 55 ℃ to obtain the transparent flexible infrared and radar composite low detectable material. The transparency of the composite low detectable material can reach more than 50 percent; the radar reflectivity at the position of 4-18 GHz is lower than-10 dB, and the radar wave reflection curve is shown in figure 4; the infrared emissivity in the wave band range of 3-14 mu m is 0.2. Therefore, the infrared and radar composite low-detectable material has good infrared and radar low-detectable performance, has a visible light transparent effect and is beneficial to being compatible with visible light protection performance.
Example 2
The composite low detectable material consists of a transparent flexible infrared and radar composite low detectable material, an infrared low radiation functional layer and a radar absorption layer;
the infrared low-radiation functional layer is a visible light transparent high-frequency band-pass low-frequency cut-off frequency selection surface and is made of an ITO (indium tin oxide) conductive thin film material with low resistance, the sheet resistance is 8 omega/sq, the unit period is 0.75mm, and the gap width is 0.08 mm; the ITO conductive film material takes a transparent flexible substrate PET as a base, and the thickness of the base is 0.175 mm;
the radar absorption layer is sequentially provided with a first transparent medium layer, a first transparent conducting layer, a second transparent medium layer and a second transparent conducting layer from top to bottom. The first transparent medium layer and the second transparent medium layer are both made of PVC materials, the dielectric constants are both 4.5, and the thicknesses are both 4 mm; the first transparent conducting layer and the second transparent conducting layer are made of transparent ITO (indium tin oxide) conducting thin film materials, the square resistance of the first transparent conducting layer is 80 omega/sq, and the square resistance of the second transparent conducting layer is 8 omega/sq. The first transparent conductive layer is provided with 2 x 2 circular arrays of absorbing structures.
The preparation method of the transparent flexible infrared and radar composite low detectable material comprises the following steps:
(1) preparing an infrared low-radiation functional layer by adopting a laser etching process: etching the ITO transparent conductive film material in the infrared low-radiation functional layer in an etching mode, only etching the ITO transparent conductive film material part, not etching through the transparent flexible substrate PET, and obtaining a visible light transparent high-frequency band-pass low-frequency cut-off frequency selection surface with a gap (the gap width is 0.08 mm);
(2) etching a first transparent conductive layer in the radar absorption layer by adopting a laser etching mode according to a preset etching pattern to obtain a plurality of circular array absorption structures, wherein the first transparent conductive layer is made of an ITO transparent conductive film material with the sheet resistance of 80 omega/sq;
(3) and (3) sequentially compounding an infrared functional layer and a radar absorption layer by adopting transparent optical curing glue, sequentially compounding an infrared low-radiation functional layer, a first transparent dielectric layer, a first transparent conducting layer, a second transparent dielectric layer and a second transparent conducting layer, and finally performing low-temperature curing treatment at 50 ℃ to obtain the transparent flexible infrared and radar composite low detectable material. The transparency of the composite low detectable material can reach more than 50%, the radar reflectivity at 4.6-18 GHz is lower than-10 dB, the radar wave reflection curve is shown in figure 5, and the infrared emissivity in the wave band range of 3-14 mu m is 0.21.
Example 3
The composite low detectable material consists of a transparent flexible infrared and radar composite low detectable material, an infrared low radiation functional layer and a radar absorption layer;
the infrared low-radiation functional layer is a visible light transparent high-frequency band-pass low-frequency cut-off frequency selection surface and is made of an ITO (indium tin oxide) conductive thin film material with low resistance, the sheet resistance is 6 omega/sq, the unit period is 0.35mm, and the gap width is 0.05 mm; the ITO conductive film material takes a transparent flexible substrate PET as a base, and the thickness of the base is 0.175 mm;
the radar absorption layer is sequentially provided with a first transparent medium layer, a first transparent conducting layer, a second transparent medium layer and a second transparent conducting layer from top to bottom. The first transparent medium layer and the second transparent medium layer are both made of PVC materials, the dielectric constants are both 3.5, and the thicknesses are both 2 mm; the first transparent conducting layer and the second transparent conducting layer are made of transparent ITO (indium tin oxide) conducting thin film materials, the square resistance of the first transparent conducting layer is 40 omega/sq, and the square resistance of the second transparent conducting layer is 6 omega/sq. The first transparent conductive layer is provided with 2 x 2 circular arrays of absorbing structures.
The preparation method of the transparent flexible infrared and radar composite low detectable material comprises the following steps:
(1) preparing an infrared low-radiation functional layer by adopting a laser etching process: etching the ITO transparent conductive film material in the infrared low-radiation functional layer in an etching mode, only etching the ITO transparent conductive film material part, not etching through the transparent flexible substrate PET, and obtaining a visible light transparent high-frequency band-pass low-frequency cut-off frequency selection surface with a gap (the gap width is 0.05 mm);
(2) etching a first transparent conductive layer in the radar absorption layer by adopting a laser etching mode according to a preset etching pattern to obtain a plurality of circular array absorption structures, wherein the first transparent conductive layer is made of an ITO transparent conductive film material with the sheet resistance of 40 omega/sq;
(3) and (3) sequentially compounding an infrared functional layer and a radar absorption layer by adopting transparent optical curing glue, sequentially compounding an infrared low-radiation functional layer, a first transparent dielectric layer, a first transparent conducting layer, a second transparent dielectric layer and a second transparent conducting layer, and finally performing low-temperature curing treatment at 50 ℃ to obtain the transparent flexible infrared and radar composite low detectable material. The transparency of the composite low detectable material can reach more than 50%, the radar reflectivity at 4.2-18 GHz is lower than-10 dB, the radar wave reflection curve is shown in figure 6, and the infrared emissivity in the wave band range of 3-14 mu m is 0.24.
Comparative example 1
The first transparent conductive layer in the radar absorbing layer is not provided with circular array of absorbing structures, and the rest of the procedure is the same as in example 1. The transparency of the composite low detectable material is below 50% and only 45%, the radar reflectivity at 4-18 GHz is lower than-4.5 dB, the radar wave reflection curve is shown in figure 7, and the infrared emissivity in the wave band range of 3-14 mu m is 0.2.
Claims (10)
1. The utility model provides a compound low detectable material of transparent flexible infrared and radar which characterized in that: the radar antenna consists of an infrared low-radiation functional layer and a radar absorption layer, wherein the infrared low-radiation functional layer is a visible light transparent high-frequency band-pass low-frequency cut-off frequency selection surface, and the radar absorption layer comprises a transparent dielectric layer and a transparent conductive layer.
2. The transparent flexible infrared and radar composite low detectable material as claimed in claim 1, wherein: the frequency selection surface of the visible light transparent high-frequency band-pass low-frequency cut-off is composed of an ITO conductive film material, the ITO conductive film material takes a transparent flexible substrate PET as a base, and the thickness of the base is 0.1 mm-0.2 mm.
3. The transparent flexible infrared and radar composite low detectable material as claimed in claim 1, wherein: the sheet resistance of the frequency selection surface of the visible light transparent high-frequency band-pass low-frequency cut-off is 5-8 omega/sq, the unit period is 0.35-0.75 mm, and the gap width is 0.04-0.08 mm.
4. The transparent flexible infrared and radar composite low detectable material as claimed in claim 1, wherein: the radar absorption layer is sequentially provided with a first transparent medium layer, a first transparent conductive layer, a second transparent medium layer and a second transparent conductive layer from top to bottom, and the first transparent conductive layer is provided with a circular array absorption structure.
5. The transparent flexible infrared and radar composite low detectable material as claimed in claim 4, wherein: the first transparent medium layer and the second transparent medium layer are both made of PVC materials.
6. The transparent flexible infrared and radar composite low detectable material as claimed in claim 4, wherein: the dielectric constants of the first transparent dielectric layer and the second transparent dielectric layer are both 2.5-4.5, and the thicknesses of the first transparent dielectric layer and the second transparent dielectric layer are both 2 mm-4 mm.
7. The transparent flexible infrared and radar composite low detectable material as claimed in claim 4, wherein: the first transparent conducting layer and the second transparent conducting layer are both made of transparent ITO conducting thin film materials.
8. The transparent flexible infrared and radar composite low detectable material as claimed in claim 4, wherein: the square resistance of the first transparent conducting layer is 40-80 omega/sq, and the square resistance of the second transparent conducting layer is 5-8 omega/sq.
9. A preparation method of the transparent flexible infrared and radar composite low detectable material as claimed in any one of claims 1 to 8, characterized by comprising the following steps:
(1) preparing an infrared low-radiation functional layer by adopting a laser etching process: etching the ITO transparent conductive film material in the infrared low-radiation functional layer by adopting an etching mode to obtain a visible light transparent high-frequency band-pass low-frequency cut-off frequency selection surface with gaps;
(2) etching the first transparent conductive layer in the radar absorption layer by adopting a laser etching mode according to a preset etching pattern to obtain the first transparent conductive layer of the circular array absorption structure;
(3) and (3) sequentially compounding an infrared functional layer and a radar absorption layer by adopting transparent optical curing glue, sequentially compounding an infrared low-radiation functional layer, a first transparent dielectric layer, a first transparent conducting layer, a second transparent dielectric layer and a second transparent conducting layer, and finally, curing to obtain the transparent flexible infrared and radar composite low detectable material.
10. The transparent flexible infrared and radar composite low detectable material as claimed in claim 9, wherein: the curing temperature is 50-60 ℃.
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| CN115236777A (en) * | 2022-07-18 | 2022-10-25 | 哈尔滨工业大学 | Visible light transparent infrared/laser compatible stealth device |
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