Automobile heat insulation film with multi-band communication signal anti-reflection function

Abstract

The utility model relates to an automobile heat insulation film with a multi-band communication signal anti-reflection function. The automobile heat insulation film comprises a hard coating; a substrate layer; the heat insulation coating is arranged on the surface, away from the hard coating, of the substrate layer; the laminated adhesive layer is arranged on the surface, far away from the substrate layer, of the heat insulation coating; a reverse matrix layer disposed on a surface of the laminated adhesive layer remote from the insulating coating; a pressure sensitive adhesive layer disposed on a surface of the reverse substrate layer remote from the laminated adhesive layer; the release film layer is arranged on the surface, far away from the reverse substrate layer, of the pressure-sensitive adhesive layer; wherein the heat insulation coating is provided with a frequency selective surface, the frequency selective surface comprises a plurality of structural units which are distributed in an array mode, and the value range of the line width between every two adjacent structural units is 0.5 micrometer to 50 micrometers. According to the invention, the problem that the heat insulation effect of the automobile heat insulation film is greatly reduced due to improvement of the signal transmittance of the automobile heat insulation film in related technologies is solved.

Description

Technical Field

[0001] This application belongs to the technical field of heat insulation films, and particularly relates to an automotive heat insulation film with the function of enhancing the transmission of multi-band communication signals. Background Art

[0002] With the development of the economy and the improvement of living standards, users' requirements for the energy conservation and comfort of automobiles are also getting higher and higher. Automotive glass is an important factor affecting automotive lighting, thermal comfort, and air-conditioning energy consumption. Attaching an automotive heat insulation film to the automotive glass can block a large amount of infrared and ultraviolet rays, and the automotive heat insulation film has a high solar energy blocking rate while allowing a relatively high visible light transmission range.

[0003] The main component of the automotive heat insulation film is a transparent metal heat insulation coating. The transparent metal heat insulation coating is composed of multiple layers of metals and metal oxides deposited on a dielectric substrate, and has a low emissivity and good heat insulation performance. However, the metal layer inside the heat insulation coating can not only reflect infrared radiation but also shield electromagnetic waves. Due to the large stacking of highly conductive metal layers, the attenuation of electromagnetic signals in the communication band by the automotive heat insulation film is inevitable.

[0004] Currently, in the related art, notches are cut in the automotive heat insulation film to solve the problem that the automotive heat insulation film attenuates wireless communication signals. The notches in the automotive heat insulation film allow external vehicle signals such as navigation signals and ETC (Electronic Toll Collection) signals to smoothly enter the vehicle. However, this destroys the structure of the automotive heat insulation film, which will cause a large amount of solar radiation to enter the vehicle, greatly reducing the heat insulation effect of the automotive heat insulation film.

[0005] Currently, no effective solution has been proposed for the problem that improving the signal transmittance of the automotive heat insulation film in the related art will greatly reduce the heat insulation effect of the automotive heat insulation film. Utility Model Content

[0006] The embodiments of this application provide an automotive heat insulation film with the function of enhancing the transmission of multi-band communication signals, so as to at least solve the problem that improving the signal transmittance of the automotive heat insulation film will greatly reduce the heat insulation effect of the automotive heat insulation film.

[0007] An embodiment of the present application provides an automotive heat insulation film with a multi - band communication signal transmission - enhancing function, including: a hard coating; a matrix layer disposed on one surface of the hard coating; a heat insulation coating disposed on the surface of the matrix layer away from the hard coating; a lamination adhesive layer disposed on the surface of the heat insulation coating away from the matrix layer; a reverse matrix layer, with the lamination adhesive layer disposed on the surface of the lamination adhesive layer away from the heat insulation coating; a pressure - sensitive adhesive layer disposed on the surface of the reverse matrix layer away from the lamination adhesive layer; a release film layer disposed on the surface of the pressure - sensitive adhesive layer away from the reverse matrix layer; wherein, the heat insulation coating has a frequency - selective surface, and the frequency - selective surface includes a plurality of structural units distributed in an array, and the value range of the line width between two adjacent structural units is 0.5 μm to 50 μm.

[0008] In some embodiments, the frequency - selective surface includes an aperture - type frequency - selective surface.

[0009] In some embodiments, the structural unit includes a first graphic structure in the shape of a square, the value range of the side length of the first graphic structure is 67 μm to 2393 μm, and the value range of the line width between two adjacent first graphic structures is 0.5 μm to 50 μm.

[0010] In some embodiments, the structural unit includes a second graphic structure in the shape of a rhombus, the value range of the side length of the second graphic structure is 19 μm to 1385.5 μm, and the value range of the line width between two adjacent second graphic structures is 0.5 μm to 50 μm.

[0011] In some embodiments, the structural unit includes a third graphic structure in the shape of a regular hexagon, the value range of the side length of the third graphic structure is 9 μm to 667 μm, and the value range of the line width between two adjacent third graphic structures is 0.5 μm to 50 μm.

[0012] In some embodiments, the structural unit includes a fourth graphic structure in the shape of a square, the fourth graphic structure includes a centrally - symmetric graphic sub - structure, the center of the graphic sub - structure coincides with the center of the square, and the value range of the line width of the graphic sub - structure is 0.5 μm to 50 μm.

[0013] In some embodiments, the graphic sub-structure includes four first sub-structures in the shape of semi-circular arcs; wherein, the diameter of the first sub-structure is equal to the side length of the fourth graphic structure, the centers of the four first sub-structures coincide with the midpoints of the four sides of the fourth graphic structure respectively, the first sub-structure corresponding to the midpoint of each side of the fourth graphic structure is tangent to the first sub-structure corresponding to the midpoint of the opposite side of each side, and intersects with the first sub-structure corresponding to the midpoint of the adjacent side of each side; the value range of the side length of the fourth graphic structure is from 52 μm to 3738 μm, and the value range of the line width of the first sub-structure is from 0.5 μm to 50 μm.

[0014] In some embodiments, the graphic sub-structure includes four second sub-structures in the shape of quarter-circular arcs; wherein, the radius of the second sub-structure is equal to the side length of the fourth graphic structure, the centers of the four second sub-structures coincide with the four vertices of the fourth graphic structure respectively, and the four second sub-structures are tangent to the four sides of the fourth graphic structure respectively; the value range of the side length of the fourth graphic structure is from 52 μm to 3753 μm, and the value range of the line width of the second sub-structure is from 0.5 μm to 50 μm.

[0015] In some embodiments, the graphic sub-structure includes four third sub-structures in the shape of rhombuses; wherein, a pair of opposite vertices of the third sub-structure coincide with a vertex and the center point of the fourth graphic structure respectively, the four vertices of the fourth graphic structure correspond to the four third sub-structures respectively, and the interior angles of the third sub-structure are 150° and 30° respectively; the value range of the side length of the third sub-structure is from 18 μm to 1286 μm, and the value range of the line width of the third sub-structure is from 0.5 μm to 50 μm; the calculation formula for the side length of the fourth graphic structure is:

[0016]

[0017] wherein, D4 is the side length of the fourth graphic structure, and L1 is the side length of the third sub-structure.

[0018] In some embodiments, the graphic sub-structure includes four fourth sub-structures in the shape of line segments; wherein, the four fourth sub-structures intersect, and the intersection point of the four fourth sub-structures coincides with the center of the fourth graphic structure, one end point of each fourth sub-structure coincides with a quarter point of one side of the fourth graphic structure, and the other end point of each fourth sub-structure coincides with a quarter point of the opposite side of one side; the value range of the side length of the fourth graphic structure is from 37 μm to 2683 μm, and the value range of the line width of the fourth sub-structure is from 0.5 μm to 50 μm; the calculation formula for the length of the fourth sub-structure is:

[0019]

[0020] wherein, D4 is the side length of the fourth graphic structure, and L2 is the length of the fourth sub-structure.

[0021] Compared with the related art, the automotive heat insulation film with the function of enhancing the penetration of multi-band communication signals provided by the embodiments of the present application forms a frequency selective surface on the heat insulation coating of the automotive heat insulation film. The frequency selective surface can achieve a high transmittance of electromagnetic signals in the target frequency band. At the same time, the frequency selective surface includes a plurality of structural units distributed in an array, and the line width between two adjacent structural units is small, which has little impact on the overall structure of the automotive heat insulation film. Therefore, the automotive heat insulation film provided by the embodiments of the present application can achieve a high transmittance of electromagnetic waves in the target frequency band while retaining the heat insulation effect of the automotive heat insulation film. Through the present application, the problem in the related art that improving the signal transmittance of the automotive heat insulation film will cause a significant reduction in the heat insulation effect of the automotive heat insulation film is solved, and the technical effect of improving the transmittance of electromagnetic waves in the target frequency band while retaining the heat insulation effect of the automotive heat insulation film is achieved.

[0022] Details of one or more embodiments of the present application are set forth in the following drawings and description to make other features, objects, and advantages of the present application more concise and understandable. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0024] Figure 1 is a schematic structural diagram of an automotive heat insulation film with the function of enhancing the penetration of multi-band communication signals according to an embodiment of the present application;

[0025] Figure 2 is a schematic structural diagram of a heat insulation coating according to an embodiment of the present application;

[0026] Figure 3 is a schematic structural diagram of a frequency selective surface and a structural unit according to an embodiment of the present application;

[0027] Figure 4 is a schematic structural diagram of a frequency selective surface and a structural unit according to another embodiment of the present application;

[0028] Figure 5 is a schematic structural diagram of a frequency selective surface and a structural unit according to still another embodiment of the present application;

[0029] Figure 6 is a schematic structural diagram of a structural unit according to still another embodiment of the present application;

[0030] Figure 7It is a schematic structural diagram of a structural unit according to another embodiment of the present application;

[0031] Figure 8 It is a schematic structural diagram of a structural unit according to another embodiment of the present application;

[0032] Figure 9 It is a schematic structural diagram of a structural unit according to another embodiment of the present application.

[0033] Among them, the reference numerals in the figure are as follows:

[0034] 100 - hard coating; 110 - matrix layer; 120 - heat insulation coating; 130 - lamination adhesive layer; 140 - reverse matrix layer; 150 - pressure - sensitive adhesive layer; 160 - release film layer; 200 - first dielectric layer; 210 - first barrier layer; 220 - first silver - based functional layer; 230 - second barrier layer; 240 - second dielectric layer; 250 - third barrier layer; 260 - second silver - based functional layer; 270 - fourth barrier layer; 280 - third dielectric layer; 300 - frequency - selective surface; 301 - first graphic structure; 302 - second graphic structure; 303 - third graphic structure; 304 - fourth graphic structure; 400 - first sub - structure; 500 - second sub - structure; 600 - third sub - structure; 700 - fourth sub - structure. Detailed implementation manners

[0035] In the following description, for the purpose of illustration rather than limitation, specific details such as specific system structures and technologies are proposed to thoroughly understand the embodiments of the present application. However, those skilled in the art should clearly understand that the present application can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well - known systems, devices, circuits, and methods are omitted to avoid unnecessary details from interfering with the description of the present application.

[0036] It should be understood that when used in the specification of the present application and the appended claims, the term "comprising" indicates the presence of the described features, wholes, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or their combinations.

[0037] It should also be understood that the term "and / or" used in the specification of the present application and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0038] As used in the specification of this application and the appended claims, the term "if" can be interpreted as "when" or "once" or "in response to determining" or "in response to detecting" depending on the context. Similarly, the phrase "if determined" or "if [the described condition or event] is detected" can be interpreted as meaning "once determined" or "in response to determining" or "once [the described condition or event] is detected" or "in response to detecting [the described condition or event]" depending on the context.

[0039] In addition, in the description of the specification of this application and the appended claims, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0040] The reference to "one embodiment" or "some embodiments" etc. described in the specification of this application means that a specific feature, structure or characteristic described in connection with that embodiment is included in one or more embodiments of this application. Thus, statements such as "in one embodiment", "in some embodiments", "in other some embodiments", "in still other embodiments" etc. that appear in different places in this specification do not necessarily all refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "comprising", "including", "having" and their variants all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0041] With the development of the economy and the improvement of living standards, users' requirements for the energy conservation and comfort of automobiles are also getting higher and higher. Automotive glass is an important factor affecting automotive lighting, thermal comfort and air-conditioning energy consumption. Attaching an automotive heat-insulating film to automotive glass can block a large amount of infrared and ultraviolet rays, and the automotive heat-insulating film has a high solar blocking rate and allows a relatively high visible light transmittance range. Currently, the more widely used and better heat-insulating and energy-saving automotive heat-insulating film is a multi-layer magnetron sputtering metal film, and the main component for heat insulation in this multi-layer magnetron sputtering metal film is a transparent metal heat-insulating coating.

[0042] The transparent metal heat-insulating coating is composed of multiple layers of metals and metal oxides deposited on a dielectric substrate, having a low emissivity and good heat-insulating performance. Its most typical structure includes a dielectric / metal / dielectric (Dielectric-Metal-Dielectric, DMD) coating stack structure. This coating stack structure includes a highly conductive metal, and the metal layer is usually a silver-based functional layer, sandwiched between transparent dielectric layers. The transparent dielectric layer is usually composed of a metal oxide (for example, any one of titanium oxide, tin oxide, zinc oxide, silicon nitride, bismuth oxide, indium oxide, or indium tin oxide). The coating stack structure of commercial automotive heat-insulating coatings usually has up to a dozen layers. In order to further protect the silver-based functional layer from degradation, a metal barrier layer is usually stacked between the dielectric layer and the silver-based functional layer.

[0043] However, the metal layer inside the heat-insulating coating can not only reflect infrared radiation but also shield electromagnetic waves. Due to the large number of stacked highly conductive metal layers, the attenuation of electromagnetic signals in the communication frequency band by automotive heat-insulating films is inevitable.

[0044] Currently, in the related art, notches are cut in the automotive heat-insulating film to solve the problem that the automotive heat-insulating film attenuates wireless communication signals. The notches in the automotive heat-insulating film allow external vehicle signals such as navigation signals and ETC (Electronic Toll Collection) signals to enter the vehicle smoothly. However, this destroys the structure of the automotive heat-insulating film, which will cause a large amount of solar radiation to enter the vehicle, greatly reducing the heat-insulating effect of the automotive heat-insulating film. In addition, a repeater and a small antenna can be installed in the vehicle to amplify the received signal. However, this method is not convenient, economical, and practical, and at the same time increases the vehicle's energy consumption and is not conducive to energy conservation and environmental protection.

[0045] Currently, no effective solution has been proposed for the problem that improving the signal transmittance of automotive heat-insulating films in the related art will greatly reduce the heat-insulating effect of automotive heat-insulating films.

[0046] In view of this, an embodiment of the present application provides an automotive heat insulation film with the function of enhancing the transmission of multi-band communication signals. A Frequency Selective Surface (FSS) is formed on the heat insulation coating of the automotive heat insulation film. When an electromagnetic signal reaches the FSS, the resonance effect of the FSS is triggered, so that the transmission of the electromagnetic wave is enhanced, and the attenuation of the electromagnetic signal is reduced. At the same time, the FSS includes a plurality of structural units distributed in an array, and the line width between two adjacent structural units is small, which has little impact on the overall structure of the automotive heat insulation film. Therefore, the automotive heat insulation film provided by the embodiment of the present application can achieve a high transmittance of electromagnetic waves in the target frequency band on the premise of retaining the heat insulation effect of the automotive heat insulation film. Through the present application, the problem that improving the signal transmittance of the automotive heat insulation film in the related art will cause a significant reduction in the heat insulation effect of the automotive heat insulation film is solved, and the technical effect of improving the transmittance of electromagnetic waves in the target frequency band while retaining the heat insulation effect of the automotive heat insulation film is achieved.

[0047] The following will be combined with Figure 1 An automotive heat insulation film with the function of enhancing the transmission of multi-band communication signals provided by an embodiment of the present application will be described. Please refer to Figure 1 , Figure 1 FIG. is a schematic structural diagram of an automotive heat insulation film with the function of enhancing the transmission of multi-band communication signals according to an embodiment of the present application. As shown in Figure 1 , the automotive heat insulation film includes: a hard coating 100; a substrate layer 110, the substrate layer 110 is disposed on one side surface of the hard coating 100; a heat insulation coating 120, the heat insulation coating 120 is disposed on the surface of the substrate layer 110 away from the hard coating 100; a lamination adhesive layer 130, the lamination adhesive layer 130 is disposed on the surface of the heat insulation coating 120 away from the substrate layer 110; a reverse substrate layer 140, the lamination adhesive layer 130 is disposed on the surface of the lamination adhesive layer 130 away from the heat insulation coating 120; a pressure-sensitive adhesive layer 150, the pressure-sensitive adhesive layer 150 is disposed on the surface of the reverse substrate layer 140 away from the lamination adhesive layer 130; a release film layer 160, the release film layer 160 is disposed on the surface of the pressure-sensitive adhesive layer 150 away from the reverse substrate layer 140; wherein, the heat insulation coating 120 has a frequency selective surface 300, and the frequency selective surface 300 includes a plurality of structural units distributed in an array, and the value range of the line width between two adjacent structural units is 0.5 μm to 50 μm.

[0048] In this embodiment, the heat insulation coating 120 can be deposited on one side of the substrate layer 110 by magnetron sputtering technology. The overall structure composed of the substrate layer 110 and the heat insulation coating 120 is attached to the reverse substrate layer 140 by using the lamination adhesive layer 130. Then, the overall structure of the automotive heat insulation film can be attached to the glass substrate of the vehicle by the pressure-sensitive adhesive layer 150.

[0049] Specifically, the hard coating 100 can mainly consist of polyacrylate polymers and nano titanium dioxide compounds; the substrate layer 110 and the reverse substrate layer 140 can be transparent polyethylene glycol terephthalate (PET) films; the release film layer 160 can be a PET film, which is used to protect the pressure-sensitive adhesive layer 150 of the automotive heat insulation film and will be torn off during actual use; the laminating adhesive layer 130 and the pressure-sensitive adhesive layer 150 are mainly acrylate adhesives.

[0050] In one embodiment, the automotive heat insulation film provided by the embodiments of the present application can be attached to automotive laminated glass, which is composed of two pieces of glass and a piece of polyvinyl butyral (PVB) film.

[0051] Specifically, the stacking order, thickness, and electromagnetic characteristic parameters of the respective constituent structures of the automotive heat insulation film and the automotive laminated glass are shown in the following table:

[0052] Table 1

[0053]

[0054]

[0055] Among them, the thickness and electromagnetic characteristic parameters of the respective constituent structures of the automotive heat insulation film and the automotive laminated glass can be set according to actual processing conditions and application requirements, and the embodiments of the present application do not limit this.

[0056] In this embodiment, by forming a frequency selective surface 300 on the heat insulation coating 120 that can cause resonance in multiple target frequency bands, a high transmittance of the automotive heat insulation film for electromagnetic signals in the target frequency bands can be achieved.

[0057] In one embodiment, the frequency selective surface 300 can be a graphic structure array formed by laser etching the heat insulation coating 120. The graphic structure array includes multiple structural units, and the graphic structure array has selective permeability to electromagnetic waves. Specifically, the graphic structure array can enable electromagnetic waves in the target frequency bands to have a high transmittance.

[0058] In other embodiments, the frequency selective surface 300 can also be a graphic structure array formed by other means such as physical engraving and chemical etching of the heat insulation coating 120. The present application does not limit the formation method of the frequency selective surface 300.

[0059] Specifically, when the frequency selective surface 300 is formed by laser etching, the line width of the frequency selective surface 300 can be the etching line width; when the frequency selective surface 300 is formed by physical engraving, the line width of the frequency selective surface 300 can be the engraving line width; when the frequency selective surface 300 is formed by chemical etching, the line width of the frequency selective surface 300 can be the etching line width.

[0060] In one embodiment, the value ranges of the etching line width, the engraving line width, and the etching line width can be from 0.5 μm to 50 μm. For example, 0.5 μm, 1 μm, 2 μm, 5 μm, 10 μm, 25 μm, 50 μm, etc. The line width can be set according to actual processing conditions and applications, and the embodiments of the present application do not limit this.

[0061] In one embodiment, the frequency selective surface 300 includes an aperture type FSS. When the aperture type FSS receives a low-frequency incident wave, since the frequency of the incident electromagnetic wave is relatively low, the induced current generated at the aperture edge is small, resulting in a small transmission coefficient. As the frequency of the incident electromagnetic wave increases, electrons oscillate back and forth with a small amplitude, the induced current at the aperture edge increases, and the transmission coefficient of the FSS increases. When the frequency increases to a specific value, the transmission coefficient reaches the maximum value at this time, and this specific value frequency is the resonance frequency of the aperture type FSS. In this embodiment, by designing the geometric parameters of the structural unit in the aperture type FSS to control the induced current of the FSS and the resonance frequency of the structural unit, a high transmission coefficient of the FSS structure can be achieved, and the transmittance of the automotive heat insulation film to the electromagnetic signal in the target frequency band can be improved.

[0062] In one embodiment, the heat insulation coating 120 can include a single silver, double silver, or triple silver structure, and its structure selection can be set according to actual processing conditions and application requirements, and the embodiments of the present application do not limit this.

[0063] By way of example and not limitation, the heat insulation coating 120 in the automotive heat insulation film provided by the embodiments of the present application can be a double silver structure. Please refer to Figure 2 , Figure 2 is a schematic structural diagram of the heat insulation coating 120 according to an embodiment of the present application. As shown in Figure 2As shown, the heat-insulating coating 120 includes a first dielectric layer 200, a second dielectric layer 240, a third dielectric layer 280, a first barrier layer 210, a second barrier layer 230, a third barrier layer 250, a fourth barrier layer 270, a first silver-based functional layer 220, and a second silver-based functional layer 260. Among them, the first barrier layer 210 is disposed between the first dielectric layer 200 and the first silver-based functional layer 220, the second barrier layer 230 is disposed between the first silver-based functional layer 220 and the second dielectric layer 240, the third barrier layer 250 is disposed between the second dielectric layer 240 and the second silver-based functional layer 260, and the fourth barrier layer 270 is disposed between the second silver-based functional layer 260 and the third dielectric layer 280.

[0064] Specifically, the first dielectric layer 200, the second dielectric layer 240, and the third dielectric layer 280 (collectively referred to as dielectric layers) may be composed of alumina, magnesia, niobium oxide, titanium oxide, tin oxide, zinc oxide, silicon oxynitride, bismuth oxide, indium oxide, indium tin oxide, or any combination thereof; the first barrier layer 210, the second barrier layer 230, the third barrier layer 250, and the fourth barrier layer 270 (collectively referred to as barrier layers) may be composed of a metal or a metal alloy (wherein the metal may include gold, titanium, aluminum, platinum, palladium, copper, indium, zinc, or any combination thereof; the metal alloy may be an alloy of chromium, nickel, or titanium); the first silver-based functional layer 220 and the second silver-based functional layer 260 (collectively referred to as silver-based functional layers) may be composed of silver.

[0065] In one embodiment, the surface resistance value of the heat insulation coating 120 can range from 0.01 ohm / square to 2000 ohm / square, such as 0.01 ohm / square, 0.1 ohm / square, 1 ohm / square, 10 ohm / square, 100 ohm / square, 1000 ohm / square, 2000 ohm / square, etc.; the thickness of the dielectric layer in the heat insulation coating 120 can range from 0.1 nm to 1000 nm, such as 0.1 nm, 1 nm, 10 nm, 50 nm, 100 nm, 200 nm, 500 nm, 1000 nm, etc.; the thickness of the barrier layer in the heat insulation coating 120 can range from 0.1 nm to 1000 nm, such as 0.1 nm, 1 nm, 10 nm, 50 nm, 100 nm, 200 nm, 500 nm, 1000 nm, etc.; the thickness of the silver-based functional layer in the heat insulation coating 120 can range from 0.1 nm to 1000 nm, such as 0.1 nm, 1 nm, 10 nm, 50 nm, 100 nm, 200 nm, 500 nm, 1000 nm, etc.; the overall thickness of the heat insulation coating 120 can range from 1 nm to 100 μm, such as 1 nm, 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, 75 μm, 100 μm, etc. The above parameters can be set according to actual processing conditions and application requirements, and the embodiments of the present application do not limit this.

[0066] In other embodiments, the heat insulation coating 120 can include one or more functional layers, one or more barrier layers, and one or more dielectric layers. The one or more functional layers can be silver-based functional layers. The functional layer can be disposed on one or both sides of any barrier layer, and the functional layer can be in direct contact with the surface on one or both sides of any barrier layer. The functional layer can also be disposed on one or both sides of any dielectric layer, and the functional layer can be in direct contact with the surface on one or both sides of any dielectric layer. The functional layer can also be disposed between two barrier layers.

[0067] In one embodiment, when there are one or more functional layers, the barrier layer can be disposed on one or both sides of any functional layer, and the barrier layer can be in direct contact with the surface on one or both sides of any functional layer. When there are one or more dielectric layers, the barrier layer can be disposed on one or both sides of any dielectric layer, and the barrier layer can be in direct contact with the surface on one or both sides of any dielectric layer. The barrier layer can also be disposed between the functional layer and the dielectric layer.

[0068] In one embodiment, when there is one or more functional layers, the dielectric layer can be disposed on one or both sides of any functional layer, and the dielectric can be in direct contact with the surfaces on one or both sides of any functional layer. When there is one or more barrier layers, the dielectric layer can be disposed on one or both sides of any barrier layer, and the dielectric layer can be in direct contact with the surfaces on one or both sides of any barrier layer.

[0069] Through the present application, a frequency selective surface 300 is formed on the heat insulation coating 120 of the automotive heat insulation film by using processes such as laser etching, physical engraving, chemical etching, masking, etc. When the electromagnetic signal is transmitted to the FSS, the resonance effect of the FSS is triggered, so that the transmission of the electromagnetic wave is enhanced and the attenuation of the electromagnetic signal is reduced. At the same time, the FSS includes a plurality of structural units distributed in an array, and the line width between two adjacent structural units is small, which has little impact on the overall structure of the automotive heat insulation film. Therefore, the automotive heat insulation film provided by the embodiment of the present application can achieve a high transmittance of electromagnetic waves in the target frequency band on the premise of retaining the heat insulation effect of the automotive heat insulation film.

[0070] The transmission loss of the electromagnetic signal of the automotive heat insulation film in the related art is about -20 dB (decibels) to -40 dB. The transmission loss of the electromagnetic signal in the target frequency band of the automotive heat insulation film provided by the embodiment of the present application can be lower than -3 dB. At the same time, when using laser etching to form the FSS, the etching amount of the heat insulation coating 120 of the automotive heat insulation film can be less than 6%, which has little impact on the overall structure of the automotive heat insulation film. Therefore, the automotive heat insulation film provided by the embodiment of the present application can achieve a high transmittance of electromagnetic waves in the target frequency band on the premise of retaining the heat insulation effect of the automotive heat insulation film.

[0071] In one embodiment, the structural unit of the frequency selective surface 300 can be a centrosymmetric shape, such as a square, a regular hexagon, a rhombus, a circle, etc., so that the frequency selective surface 300 has certain polarization stability and stability for large-angle incidence.

[0072] Next, Figure 3 a frequency selective surface 300 and a structural unit of an embodiment of the present application will be described. Figure 3 is a schematic structural diagram of a frequency selective surface 300 and a structural unit according to an embodiment of the present application. As Figure 3 shown, in one embodiment, the structural unit can include a first graphic structure 301 in the shape of a square. The value range of the side length of the first graphic structure 301 can be from 67 μm to 2393 μm, and the value range of the line width between two adjacent first graphic structures 301 can be from 0.5 μm to 50 μm.

[0073] Specifically, Figure 3The side length D1 of the first graphic structure 301 is 1328 μm, and the line width W1 between two adjacent first graphic structures 301 is 20 μm. After etching the structural unit as shown in Figure 3 on the heat insulation coating 120 of the automotive heat insulation film, the frequency bands at which the transverse electric (TE) wave and the transverse magnetic (TM) wave reach the -3 dB bandwidth under different incident angles are shown in Table 2:

[0074] Table 2

[0075]

[0076]

[0077] As shown in Table 2, when the structural unit is the first graphic structure 301 as shown in Figure 3 and the TE wave and the TM wave are incident perpendicularly, the automotive laminated glass attached with the automotive heat insulation film provided by the embodiment of the present application has a relatively high transmittance (i.e., reaching the -3 dB bandwidth) for the TE wave in the target frequency bands (i.e., 0 GHz to 3.6 GHz and 7.2 GHz to 11.1 GHz), and the TM wave in the target frequency bands (i.e., 0 GHz to 3.6 GHz and 7.1 GHz to 11.14 GHz); when the TE wave and the TM wave are incident at an incident angle of 20 degrees, it has a relatively high transmittance for the TE wave in the target frequency bands (i.e., 0 GHz to 3.2 GHz and 7.6 GHz to 11.1 GHz), and the TM wave in the target frequency bands (i.e., 0 GHz to 4.2 GHz and 6.7 GHz to 11.4 GHz); when the TE wave and the TM wave are incident at an incident angle of 40 degrees, it has a relatively high transmittance for the TE wave in the target frequency bands (i.e., 0 GHz to 2.4 GHz and 8.7 GHz to 10.8 GHz), and the TM wave in the target frequency bands (i.e., 0 GHz to 11.9 GHz); when the TE wave and the TM wave are incident at an incident angle of 60 degrees, it has a relatively high transmittance for the TE wave in the target frequency bands (i.e., 0 GHz to 1.5 GHz and 10.1 GHz to 10.8 GHz), and the TM wave in the target frequency bands (i.e., 0 GHz to 13.2 GHz).

[0078] Figure 4 is a schematic structural diagram of the frequency selective surface 300 and the structural unit according to another embodiment of the present application. As shown in Figure 4 , in one embodiment, the structural unit may include a second graphic structure 302 in the shape of a rhombus. The value range of the side length of the second graphic structure 302 may be from 19 μm to 1385.5 μm, and the value range of the line width between two adjacent second graphic structures 302 may be from 0.5 μm to 50 μm.

[0079] Specifically, Figure 4The side length D2 of the second graphic structure 302 is 808.5 μm, and the line width W2 between two adjacent second graphic structures 302 is 21 μm. After etching the structural unit as shown in Figure 4 on the heat insulation coating 120 of the automotive heat insulation film, the frequency bands of the TE wave and the TM wave at different incident angles reaching the -3 dB bandwidth and the -1 dB bandwidth are shown in Table 3:

[0080] Table 3

[0081]

[0082] As shown in Table 3, when the structural unit is the second graphic structure 302 as shown in Figure 4 and the TE wave and the TM wave are incident normally, the automotive laminated glass attached with the automotive heat insulation film provided by the embodiment of the present application has a high transmittance (i.e., reaching the -3 dB bandwidth) for the TE wave in the target frequency bands (i.e., 0 GHz to 14 GHz and 22.4 GHz to 25.5 GHz) and the TM wave in the target frequency bands (i.e., 0 GHz to 3.3 GHz and 7.3 GHz to 10.5 GHz); when the TE wave and the TM wave are incident at an incident angle of 20 degrees, it has a high transmittance for the TE wave in the target frequency bands (i.e., 0 GHz to 5.1 GHz, 6.7 GHz to 14 GHz and 23 GHz to 25.7 GHz) and the TM wave in the target frequency bands (i.e., 0 GHz to 3.7 GHz and 7.1 GHz to 10.7 GHz); when the TE wave and the TM wave are incident at an incident angle of 40 degrees, it has a high transmittance for the TE wave in the target frequency bands (i.e., 0 GHz to 3.45 GHz, 8.8 GHz to 13.8 GHz and 24.6 GHz to 25.9 GHz) and the TM wave in the target frequency bands (i.e., 0 GHz to 11.2 GHz); when the TE wave and the TM wave are incident at an incident angle of 60 degrees, it has a high transmittance for the TE wave in the target frequency bands (i.e., 0 GHz to 2 GHz and 10.6 GHz to 13.3 GHz) and the TM wave in the target frequency bands (i.e., 0 GHz to 12 GHz).

[0083] Meanwhile, when the TE wave is incident perpendicularly, the automotive laminated glass attached with the automotive heat insulation film provided by the embodiment of the present application has a higher transmittance (i.e., the -1 dB bandwidth) for the TE wave in the target frequency bands (i.e., 0 GHz to 2 GHz and 9.95 GHz to 11.9 GHz) and the TM wave in the target frequency band (i.e., 0 GHz to 1.4 GHz); when the TE wave is incident at an angle of 20 degrees, it has a higher transmittance for the TE wave in the target frequency bands (i.e., 0 GHz to 1.85 GHz and 10.3 GHz to 11.9 GHz) and the TM wave in the target frequency band (i.e., 0 GHz to 1.55 GHz); when the TE wave is incident at an angle of 40 degrees, it has a higher transmittance for the TE wave in the target frequency band (i.e., 0 GHz to 1.53 GHz) and the TM wave in the target frequency band (i.e., 0 GHz to 2 GHz); when the TE wave is incident at an angle of 60 degrees, it has a higher transmittance for the TE wave in the target frequency band (i.e., 0 GHz to 1 GHz) and the TM wave in the target frequency band (i.e., 0 GHz to 4.73 GHz).

[0084] Figure 5 is a schematic structural diagram of the frequency selective surface 300 and the structural unit according to another embodiment of the present application, as Figure 5 shown. In one embodiment, the structural unit may include a third graphic structure 303 in the shape of a regular hexagon. The value range of the side length of the third graphic structure 303 may be from 9 μm to 667 μm, and the value range of the line width between two adjacent third graphic structures 303 may be from 0.5 μm to 50 μm.

[0085] Specifically, Figure 5 the side length D3 of the third graphic structure 303 in Figure 5 is 1617 μm, and the line width W3 between two adjacent third graphic structures 303 is 21 μm. After etching the structural unit shown in

[0086] Table 4

[0087]

[0088] As shown in Table 4, when the structural unit is as shown in Figure 5When the third graphic structure 303 shown is under normal incidence of TE waves and TM waves, the automotive laminated glass attached with the automotive heat insulation film provided by the embodiment of the present application has a high transmittance (i.e., reaching the -3dB bandwidth) for TE waves in the target frequency bands (i.e., 0 GHz to 13.52 GHz and 22.62 GHz to 24.7 GHz) and TM waves in the target frequency band (i.e., 0 GHz to 13.2 GHz); when TE waves and TM waves are incident at an angle of 20 degrees, it has a high transmittance for TE waves in the target frequency bands (i.e., 0 GHz to 3.94 GHz and 7.24 GHz to 12.24 GHz) and TM waves in the target frequency band (i.e., 0 GHz to 12.6 GHz); when TE waves and TM waves are incident at an angle of 40 degrees, it has a high transmittance for TE waves in the target frequency bands (i.e., 0 GHz to 2.89 GHz and 8.58 GHz to 12.13 GHz) and TM waves in the target frequency band (i.e., 0 GHz to 13.4 GHz); when TE waves and TM waves are incident at an angle of 60 degrees, it has a high transmittance for TE waves in the target frequency bands (i.e., 0 GHz to 1.88 GHz and 10.15 GHz to 12.22 GHz) and TM waves in the target frequency band (i.e., 0 GHz to 16.5 GHz).

[0089] Meanwhile, when TE waves and TM waves are under normal incidence, the automotive laminated glass attached with the automotive heat insulation film provided by the embodiment of the present application has a higher transmittance (i.e., reaching the -1dB bandwidth) for TE waves in the target frequency bands (i.e., 0 GHz to 2 GHz and 9.84 GHz to 11.4 GHz) and TM waves in the target frequency bands (i.e., 0 GHz to 1.9 GHz and 10 GHz to 11 GHz); when TE waves and TM waves are incident at an angle of 20 degrees, it has a higher transmittance for TE waves in the target frequency band (i.e., 0 GHz to 1.69 GHz) and TM waves in the target frequency band (i.e., 0 GHz to 1.91 GHz); when TE waves and TM waves are incident at an angle of 40 degrees, it has a higher transmittance for TE waves in the target frequency band (i.e., 0 GHz to 1.37 GHz) and TM waves in the target frequency band (i.e., 0 GHz to 2.6 GHz); when TE waves and TM waves are incident at an angle of 60 degrees, it has a higher transmittance for TE waves in the target frequency band (i.e., 0 GHz to 0.88 GHz) and TM waves in the target frequency band (i.e., 0 GHz to 9.45 GHz).

[0090] In one embodiment, the structural unit may include a fourth graphic structure 304 in the shape of a square. The fourth graphic structure 304 may include a centrally symmetric graphic sub-structure. The center of the graphic sub-structure may coincide with the center of the square, and the value range of the line width of the graphic sub-structure may be from 0.5 μm to 50 μm.

[0091] Figure 6 is a schematic structural diagram of a structural unit according to another embodiment of the present application, as Figure 6As shown, in one embodiment, the graphic sub-structure may include four first sub-structures 400 shaped like semi-circular arcs, and the four first sub-structures 400 shaped like semi-circular arcs form a leaf pattern; wherein, the diameter of the first sub-structure 400 may be equal to the side length of the fourth graphic structure 304, the centers of the four first sub-structures 400 may respectively coincide with the midpoints of the four sides of the fourth graphic structure 304, and the first sub-structure 400 corresponding to the midpoint of each side of the fourth graphic structure 304 may be tangent to the first sub-structure 400 corresponding to the midpoint of the opposite side of each side and may intersect with the first sub-structure 400 corresponding to the midpoint of the adjacent side of each side; the value range of the side length of the fourth graphic structure 304 may be from 52 μm to 3738 μm, and the value range of the line width of the first sub-structure 400 may be from 0.5 μm to 50 μm.

[0092] Specifically, Figure 6 in [reference], the side length D4 of the fourth graphic structure 304 is 2177 μm, and the line width W4 of the first sub-structure 400 is 21 μm. After etching the structural unit as shown in Figure 6 on the heat insulation coating 120 of the automotive heat insulation film, the frequency bands at which the TE wave and the TM wave reach the -3 dB bandwidth under different incident angles are shown in Table 5:

[0093] Table 5

[0094]

[0095] As shown in Table 5, when the structural unit is the fourth graphic structure 304 as shown in Figure 6 and the TE wave and the TM wave are incident normally, the automotive laminated glass attached with the automotive heat insulation film provided by the embodiment of the present application has a relatively high transmittance (i.e., reaching the -3 dB bandwidth) for the TE wave in the target frequency bands (i.e., 0 GHz to 4.6 GHz and 6.5 GHz to 12.3 GHz) and the TM wave in the target frequency bands (i.e., 0 GHz to 4.6 GHz and 6.5 GHz to 12.3 GHz); when the TE wave and the TM wave are incident at an incident angle of 20 degrees, it has a relatively high transmittance for the TE wave in the target frequency bands (i.e., 0 GHz to 3.7 GHz and 7.4 GHz to 11.7 GHz) and the TM wave in the target frequency bands (i.e., 0 GHz to 5 GHz and 6.1 GHz to 12 GHz); when the TE wave and the TM wave are incident at an incident angle of 40 degrees, it has a relatively high transmittance for the TE wave in the target frequency bands (i.e., 0 GHz to 2.5 GHz and 8.7 GHz to 10.85 GHz) and the TM wave in the target frequency bands (i.e., 0 GHz to 11.6 GHz); when the TE wave and the TM wave are incident at an incident angle of 60 degrees, it has a relatively high transmittance for the TE wave in the target frequency bands (i.e., 0 GHz to 1.6 GHz and 10 GHz to 10.8 GHz) and the TM wave in the target frequency bands (i.e., 0 GHz to 13.3 GHz).

[0096] Figure 7 It is a schematic structural diagram of a structural unit according to another embodiment of the present application. As Figure 7 shown, in one embodiment, the graphic sub-structure may include four second sub-structures 500 in the shape of quarter circles. The four second sub-structures 500 form a petal pattern. Among them, the radius of the second sub-structure 500 may be equal to the side length of the fourth graphic structure 304. The centers of the four second sub-structures 500 may coincide with the four vertices of the fourth graphic structure 304 respectively. The four second sub-structures 500 may be tangent to the four sides of the fourth graphic structure 304 respectively. The value range of the side length of the fourth graphic structure 304 may be from 52 μm to 3753 μm, and the value range of the line width of the second sub-structure 500 may be from 0.5 μm to 50 μm.

[0097] Specifically, Figure 7 the side length D4 of the fourth graphic structure 304 in Figure 7 is 1617 μm, and the line width W5 of the second sub-structure 500 is 21 μm. After etching the structural unit as Figure 7 shown on the heat insulation coating 120 of the automotive heat insulation film, the frequency bands at which the TE wave and TM wave reach -3 dB bandwidth under different incident angles are shown in Table 6:

[0098] Table 6

[0099]

[0100] As shown in Table 6, when the structural unit is the fourth graphic structure 304 as Figure 7 shown and the TE wave and TM wave are incident normally, the automotive laminated glass attached with the automotive heat insulation film provided by the embodiment of the present application has a relatively high transmittance (i.e., reaching -3 dB bandwidth) for the TE wave in the target frequency bands (i.e., 0 GHz to 13.4 GHz and 22.76 GHz to 24.5 GHz), and the TM wave in the target frequency bands (i.e., 0 GHz to 13.4 GHz and 22.8 GHz to 24.3 GHz); when the TE wave and TM wave are incident at an incident angle of 20 degrees, it has a relatively high transmittance for the TE wave in the target frequency bands (i.e., 0 GHz to 4.4 GHz and 7 GHz to 12.9 GHz), and the TM wave in the target frequency band (i.e., 0 GHz to 12.9 GHz); when the TE wave and TM wave are incident at an incident angle of 40 degrees, it has a relatively high transmittance for the TE wave in the target frequency bands (i.e., 0 GHz to 3.1 GHz and 8.6 GHz to 12.8 GHz), and the TM wave in the target frequency band (i.e., 0 GHz to 14.4 GHz); when the TE wave and TM wave are incident at an incident angle of 60 degrees, it has a relatively high transmittance for the TE wave in the target frequency bands (i.e., 0 GHz to 1.85 GHz and 10.2 GHz to 12.2 GHz), and the TM wave in the target frequency band (i.e., 0 GHz to 17.4 GHz).

[0101] Figure 8 is a schematic structural diagram of a structural unit according to another embodiment of the present application. As Figure 8 shown, in one embodiment, the graphic sub-structure may include four third sub-structures 600 in the shape of a rhombus, and the four third sub-structures 600 form a leaf pattern; wherein, a pair of opposite vertices of the third sub-structure 600 may coincide with a vertex and the center point of the fourth graphic structure 304 respectively, the center point of the fourth graphic structure 304 may be the vertex shared by the four third sub-structures 600, the four vertices of the fourth graphic structure 304 may correspond to the four third sub-structures 600 respectively, the interior angles of the third sub-structure 600 may be 150° and 30° respectively, and the four side lengths of the third sub-structure 600 may be the same; the value range of the side length of the third sub-structure 600 may be from 18 μm to 1286 μm, and the value range of the line width of the third sub-structure 600 may be from 0.5 μm to 50 μm; the calculation formula for the side length of the fourth graphic structure 304 may be:

[0102]

[0103] wherein, D4 is the side length of the fourth graphic structure 304, and L1 is the side length of the third sub-structure 600.

[0104] Specifically, Figure 8 the side length D4 of the fourth graphic structure 304 in Figure 8 is 1617 μm, and the line width W6 of the third sub-structure 600 is 21 μm. After etching the structural unit shown in

[0105] Table 7

[0106]

[0107]

[0108] As shown in Table 7, when the structural unit is as shown in Figure 8When the fourth graphic structure 304 shown is under normal incidence of TE waves and TM waves, the automotive laminated glass with the automotive heat insulation film provided by the embodiment of the present application has a high transmittance (i.e., reaching the -3 dB bandwidth) for TE waves in the target frequency bands (i.e., 0 GHz to 5.2 GHz and 6.1 GHz to 12.8 GHz) and TM waves in the target frequency bands (i.e., 0 GHz to 5 GHz and 6 GHz to 12.8 GHz); when TE waves and TM waves are incident at an angle of 20 degrees, it has a high transmittance for TE waves in the target frequency bands (i.e., 0 GHz to 3.93 GHz and 7.22 GHz to 12.3 GHz) and TM waves in the target frequency bands (i.e., 0 GHz to 12.6 GHz); when TE waves and TM waves are incident at an angle of 40 degrees, it has a high transmittance for TE waves in the target frequency bands (i.e., 0 GHz to 2.98 GHz and 8.59 GHz to 12.2 GHz) and TM waves in the target frequency bands (i.e., 0 GHz to 13.4 GHz); when TE waves and TM waves are incident at an angle of 60 degrees, it has a high transmittance for TE waves in the target frequency bands (i.e., 0 GHz to 1.78 GHz and 10.17 GHz to 12 GHz) and TM waves in the target frequency bands (i.e., 0 GHz to 16.3 GHz).

[0109] Figure 9 is a schematic structural diagram of a structural unit according to another embodiment of the present application, as Figure 9 shown. In one embodiment, the graphic sub-structure may include four fourth sub-structures 700 in the shape of line segments; among them, the four fourth sub-structures 700 may intersect, and the intersection points of the four fourth sub-structures 700 may coincide with the center of the fourth graphic structure 304. One end point of each fourth sub-structure 700 may coincide with a quartering point of one side of the fourth graphic structure 304, and the other end point of each fourth sub-structure 700 may coincide with a quartering point of the opposite side of this one side. None of the four fourth sub-structures 700 is perpendicular to any side of the fourth graphic structure 304; the value range of the side length of the fourth graphic structure 304 may be 37 μm to 2683 μm, and the value range of the line width of the fourth sub-structure 700 may be 0.5 μm to 50 μm; the calculation formula for the length of the fourth sub-structure 700 may be:

[0110]

[0111] where D4 is the side length of the fourth graphic structure 304, and L2 is the length of the fourth sub-structure 700.

[0112] Specifically, Figure 9 the side length D4 of the fourth graphic structure 304 in Figure 9After the structural unit shown, the frequency bands at which the TE wave and TM wave reach the -3 dB bandwidth under different incident angles are shown in Table 8 as follows:

[0113] Table 8

[0114]

[0115] As shown in Table 8, when the structural unit is the fourth graphic structure 304 shown as Figure 9 and the TE wave and TM wave are incident normally, the automotive laminated glass attached with the automotive heat insulation film provided by the embodiment of the present application has a high transmittance (i.e., reaching the -3 dB bandwidth) for the TE wave in the target frequency bands (i.e., 0 GHz to 4.16 GHz and 6.76 GHz to 11.8 GHz) and the TM wave in the target frequency bands (i.e., 0 GHz to 4 GHz and 6.89 GHz to 11.5 GHz); when the TE wave and TM wave are incident at an incident angle of 20 degrees, it has a high transmittance for the TE wave in the target frequency bands (i.e., 0 GHz to 3.5 GHz and 7.5 GHz to 11.36 GHz) and the TM wave in the target frequency bands (i.e., 0 GHz to 4.3 GHz and 6.71 GHz to 11.3 GHz); when the TE wave and TM wave are incident at an incident angle of 40 degrees, it has a high transmittance for the TE wave in the target frequency bands (i.e., 0 GHz to 2.69 GHz and 8.61 GHz to 11.4 GHz) and the TM wave in the target frequency bands (i.e., 0 GHz to 12.4 GHz); when the TE wave and TM wave are incident at an incident angle of 60 degrees, it has a high transmittance for the TE wave in the target frequency bands (i.e., 0 GHz to 1.67 GHz and 10.1 GHz to 11.1 GHz) and the TM wave in the target frequency bands (i.e., 0 GHz to 13.9 GHz).

[0116] As described above, the heat insulation coating 120 of the automotive heat insulation film provided by the embodiment of the present application can have frequency selective surfaces 300 of various styles. The shape and various parameters of the structural unit of the frequency selective surface 300 and the shape and various parameters of the sub-structures in the structural unit will all affect the transmittance of electromagnetic signals in different frequency bands. Therefore, in practical applications, the shape and various parameters of the structural unit and the shape and various parameters of the sub-structures in the structural unit can be selected according to the desired target frequency bands and actual application scenarios, so as to meet the requirements for high transmittance of electromagnetic signals in different frequency bands.

[0117] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. An automotive thermal insulation film with multi-band communication signal anti-transmission function, characterized in that: include: Hard coating (100); A matrix layer (110), wherein the matrix layer (110) is disposed on one side surface of the hard coating layer (100); A heat-insulating coating (120), wherein the heat-insulating coating (120) is disposed on a surface of the matrix layer (110) away from the hard coating (100); A laminating adhesive layer (130), wherein the laminating adhesive layer (130) is disposed on a surface of the thermal insulation coating (120) away from the substrate layer (110); a reverse matrix layer (140), wherein the laminating adhesive layer (130) is disposed on a surface of the laminating adhesive layer (130) away from the thermal insulation coating (120); A pressure-sensitive adhesive layer (150) disposed on a surface of the reverse substrate layer (140) away from the laminating adhesive layer (130); A release film layer (160), wherein the release film layer (160) is disposed on a surface of the pressure-sensitive adhesive layer (150) away from the reverse matrix layer (140); wherein: The thermal insulation coating (120) has a frequency selective surface (300), the frequency selective surface (300) comprises a plurality of structural units distributed in an array, and the line width between two adjacent structural units ranges from 0.5 μm to 50 μm.

2. The automotive thermal insulation film with multi-band communication signal anti-transmission function according to claim 1, characterized in that: The frequency selective surface (300) comprises an aperture-type frequency selective surface (300).

3. The automotive thermal insulation film with multi-band communication signal anti-transmission function according to claim 1 or 2, characterized in that: The structural unit comprises a first graphic structure (301) in a square shape, the side length of the first graphic structure (301) ranges from 67 μm to 2393 μm, and the line width between two adjacent first graphic structures (301) ranges from 0.5 μm to 50 μm.

4. The automotive thermal insulation film with multi-band communication signal anti-transmission function according to claim 1 or 2, characterized in that: The structural unit comprises a second graphic structure (302) in the shape of a rhombus, the side length of the second graphic structure (302) ranges from 19 μm to 1385.5 μm, and the line width between two adjacent second graphic structures (302) ranges from 0.5 μm to 50 μm.

5. The automotive thermal insulation film with multi-band communication signal anti-transmission function according to claim 1 or 2, characterized in that: The structural unit comprises a third graphic structure (303) in the shape of a regular hexagon, the side length of the third graphic structure (303) ranges from 9 μm to 667 μm, and the line width between two adjacent third graphic structures (303) ranges from 0.5 μm to 50 μm.

6. The automotive thermal insulation film with multi-band communication signal anti-transmission function according to claim 1 or 2, characterized in that: The structural unit comprises a fourth graphic structure (304) in the shape of a square, the fourth graphic structure (304) comprises a centrally symmetrical graphic substructure, the center of the graphic substructure coincides with the center of the square, and the line width of the graphic substructure ranges from 0.5 μm to 50 μm.

7. The automotive thermal insulation film with multi-band communication signal anti-transmission function according to claim 6, characterized in that: The graphic substructure includes four first substructures (400) in the shape of semicircular arcs; wherein, The diameter of the first substructure (400) is equal to the side length of the fourth graphic structure (304); the centers of the four first substructures (400) coincide with the midpoints of the four sides of the fourth graphic structure (304); the first substructure (400) corresponding to the midpoint of each side of the fourth graphic structure (304) is tangent to the first substructure (400) corresponding to the midpoint of the opposite side of each side, and intersects with the first substructure (400) corresponding to the midpoint of the adjacent side of each side; The side length of the fourth graphic structure (304) ranges from 52 μm to 3738 μm, and the line width of the first substructure (400) ranges from 0.5 μm to 50 μm.

8. The automotive thermal insulation film with multi-band communication signal anti-transmission function according to claim 6, characterized in that: The graphic substructure includes four second substructures (500) in the shape of quarter arcs; wherein, The radius of the second substructure (500) is equal to the side length of the fourth graphic structure (304), the centers of the four second substructures (500) respectively coincide with the four vertices of the fourth graphic structure (304), and the four second substructures (500) are respectively tangent to the four sides of the fourth graphic structure (304); The side length of the fourth graphic structure (304) ranges from 52 μm to 3753 μm, and the line width of the second substructure (500) ranges from 0.5 μm to 50 μm.

9. The automotive thermal insulation film with multi-band communication signal anti-transmission function according to claim 6, characterized in that: The graphic substructure includes four third substructures (600) in the shape of diamonds; wherein, A pair of opposite vertices of the third substructure (600) respectively coincide with a vertex and a center point of the fourth graphic structure (304), four vertices of the fourth graphic structure (304) respectively correspond to four third substructures (600), and the internal angles of the third substructure (600) are 150° and 30° respectively; The side length of the third substructure (600) ranges from 18 μm to 1286 μm, and the line width of the third substructure (600) ranges from 0.5 μm to 50 μm; The calculation formula for the side length of the fourth graphic structure (304) is: Wherein, D4 is the side length of the fourth graphic structure (304), and L1 is the side length of the third substructure (600).

10. The automotive thermal insulation film with multi-band communication signal anti-transmission function according to claim 6, characterized in that: The graphic substructure includes four fourth substructures (700) shaped as line segments; wherein, The four fourth substructures (700) intersect, and the intersection of the four fourth substructures (700) coincides with the center of the fourth graphic structure (304), an endpoint of each of the fourth substructures (700) coincides with a quarter point of a side of the fourth graphic structure (304), and another endpoint of each of the fourth substructures (700) coincides with a quarter point of an opposite side of the side; The side length of the fourth graphic structure (304) ranges from 37 μm to 2683 μm, and the line width of the fourth substructure (700) ranges from 0.5 μm to 50 μm; The calculation formula of the length of the fourth substructure (700) is: Wherein, D4 is the side length of the fourth graphic structure (304), and L2 is the length of the fourth substructure (700).

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