Radiation heat dissipation type wave-absorbing glass with low infrared characteristic

Abstract

The invention discloses radiation heat dissipation type wave-absorbing glass with a low infrared characteristic. The radiation heat dissipation type wave-absorbing glass is composed of radar wave-absorbing glass, radar selective transmission glass and a transparent infrared absorbing film. Compatibility of radiation heat dissipation and low infrared characteristics of the radar wave-absorbing glass is realized through the transparent infrared absorbing film, selective transmission of radar waves by the transparent infrared absorbing film is realized through the radar selective transmission glass, and effective broadband absorption of transmitted radar waves is realized through the radar wave-absorbing glass. The radiation heat dissipation type wave-absorbing glass with a low infrared characteristic is realized by laminating and compounding the radar wave-absorbing glass, the radar selective transmission glass and the transparent infrared absorbing film, and the application of the radar wave-absorbing glass in the radar and infrared compatible stealth field is facilitated.

Description

Technical Field

[0001] This invention belongs to the field of multi-spectral stealth technology, specifically relating to a radiation-absorbing glass with low infrared characteristics. Background Technology

[0002] Radar-absorbing glass plays a crucial role in airborne and land-based stealth scenarios that include optically transparent windows. To cope with multi-faceted and complex detection, it is urgent to achieve infrared-compatible stealth for radar-absorbing glass. Although low-infrared radar-absorbing glass (CN 112622391 A) can reduce the infrared emissivity of radar-absorbing glass, its radar absorption function relies on an electromagnetic-thermal conversion absorption mechanism. The heat generated increases the risk of exposure of radar-stealth targets to infrared detection methods. Therefore, achieving a design that combines heat dissipation and low infrared characteristics is a key factor in determining whether radar-absorbing glass can be applied from a single radar stealth capability to a radar-infrared compatible stealth capability. Summary of the Invention

[0003] This invention proposes a low-infrared-characteristic radiative heat-dissipating radar-absorbing glass, comprising radar-absorbing glass, radar-selective glass, and a transparent infrared-absorbing film. The transparent infrared-absorbing film achieves compatibility between radiative heat dissipation and low infrared characteristics; the radar-selective glass enables selective transmission of radar waves; and the radar-absorbing glass achieves effective broadband absorption of transmitted radar waves. The composite layering of these three components—radar-absorbing glass, radar-selective glass, and transparent infrared-absorbing film—results in a low-infrared-characteristic radiative heat-dissipating radar-absorbing glass, which is beneficial for its application in radar-infrared compatible stealth applications.

[0004] The technical solution for achieving this invention is as follows: a low-infrared-characteristic radiation-dissipating absorbing glass, comprising radar-absorbing glass, radar-selective glass, and a transparent infrared-absorbing film along the positive z-axis. All three layers are artificial structural units arranged periodically along the x and y directions. Specifically, the radar-absorbing glass, along the positive z-axis, consists of an ITO (indium tin oxide) film deposited on a PET (polyterephthalic acid) film, a PMMA (polymethyl methacrylate) layer, and a structured ITO film deposited on the PET film; the structured ITO film adopts a double-ring configuration. The radar-selective glass, along the positive z-axis, consists of a PMMA dielectric layer and a structured silver film; the structured silver film adopts a square patch configuration. The transparent infrared-absorbing film, along the positive z-axis, consists of a zinc sulfide film and a structured silver film; the structured silver film adopts a square patch configuration.

[0005] Compared with the prior art, the significant advantages of this invention are:

[0006] (1) The present invention introduces radar selective glass and infrared absorption film on radar absorbing glass, realizing the compatible design of radar absorbing glass with radiation heat dissipation and low infrared characteristics.

[0007] (2) A transparent infrared absorbing film was designed to achieve a transparent design of radar absorbing glass that is compatible with heat dissipation and low infrared characteristics. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the overall structure of a radiation-absorbing glass with low infrared characteristics according to the present invention.

[0009] Figure 2 This is a schematic diagram of the unit structure of radar absorbing glass in a radiation-heat-dissipating absorbing glass with low infrared characteristics according to the present invention.

[0010] Figure 3 This is a schematic diagram of the unit structure of radar selective glass in a radiation-heat-dissipating absorbing glass with low infrared characteristics according to the present invention.

[0011] Figure 4 This is a schematic diagram of the unit structure of the transparent infrared absorbing film in a radiation-heat-dissipating absorbing glass with low infrared characteristics according to the present invention.

[0012] Figure 5 This invention relates to the infrared absorption spectrum of a radiation-heat-dissipating absorbing glass with low infrared characteristics.

[0013] Figure 6 This invention relates to the radar reflection spectrum of a radiation-absorbing glass with low infrared characteristics. Detailed Implementation

[0014] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0015] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0016] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly and specifically defined.

[0017] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible to those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0018] The following section will further introduce the specific implementation method, as well as the technical difficulties and inventive points of this invention, using this design example as an example.

[0019] like Figure 1 As shown, a low-infrared-characteristic radiation-dissipating absorbing glass is composed of radar-absorbing glass, radar-selective glass and transparent infrared-absorbing film from bottom to top along the positive z-axis.

[0020] The electromagnetic wave absorption rate is shown in equation (1):

[0021] (1),

[0022] Among them, S 11 And representing the reflection S-parameter, S 21 This represents the transmission S-parameter. The present invention's S... 21 =0.

[0023] Reflection parameter S 11 The relationship between the reflection coefficient Γ and the reflection coefficient is shown in equation (2):

[0024] (2),

[0025] The relationship between the reflection coefficient and the characteristic impedance is shown in equation (3):

[0026] (3),

[0027] The wave impedance in free space is Z0 = 377 Ω.

[0028] The radar reflection parameter S of a low-infrared radiation-dissipating absorbing glass according to the present invention. 11 It is determined by both radar-absorbing glass and radar-selective glass.

[0029] Radar characteristic impedance Z in As shown in equation (4):

[0030] (4),

[0031] Where Z1 represents the characteristic impedance of the radar selective glass, and Z2 represents the characteristic impedance of the radar absorbing glass.

[0032] like Figure 2 The radar selective glass is composed of several radar selective glass units arranged in rows and columns. The radar selective glass unit is the first PMMA dielectric layer. The positive z-axis direction is the top surface. A first structured silver film is deposited on the top surface of the first PMMA dielectric layer. The first structured silver film adopts a square patch structure.

[0033] The characteristic impedance Z1 of the radar selective glass consists of two parts: the characteristic impedance Z3 of the first square patch silver film and the characteristic impedance Z4 of the first PMMA dielectric layer.

[0034] (5),

[0035] The characteristic impedance Z3 of the square patch silver film is expressed as follows:

[0036] (6),

[0037] Where j represents the imaginary part, L3 is the equivalent inductance, C3 is the equivalent capacitance, ω is the angular frequency of the electromagnetic wave, and R3 represents the equivalent resistance.

[0038] For a square chip silver film, its equivalent inductance L3 can be calculated using the following formula:

[0039] (7),

[0040] The equivalent capacitance C3 of the square chip silver film can be calculated using the following formula:

[0041] (8),

[0042] Where l3 represents the side length of the square patch silver film, P3 is the period of the radar selective glass unit, λ represents the wavelength at the operating frequency, and θ represents the incident angle of the electromagnetic wave.

[0043] The equivalent inductance correction factor is as follows:

[0044] (9),

[0045] The equivalent capacitance correction factor is as follows:

[0046] (10),

[0047] The F function represents the first intermediate function, and its calculation is shown in equation (11):

[0048] (11),

[0049] Wherein, the G function represents the second intermediate function, and its calculation is shown in equation (12):

[0050] (12),

[0051] Where A represents the first intermediate variable, as shown in equation (13):

[0052] (13),

[0053] β represents the second intermediate variable, as shown in equation (14):

[0054] (14),

[0055] Where m1, m2, m3, and m4 are free variables, which can be replaced by the parameters in equations (7)-(8).

[0056] The equivalent resistance R3 of the square patch silver film is shown in equation (15):

[0057] (15),

[0058] Where σ3 represents the conductivity of the first square patch silver film, and h3 represents the thickness of the first square patch silver film.

[0059] The characteristic impedance Z4 of the first PMMA dielectric layer is shown in equation (16):

[0060] (16),

[0061] Where ε4 represents the relative permittivity of the first PMMA dielectric layer, f represents the frequency of the incident electromagnetic wave, h4 represents the thickness of the first PMMA dielectric layer, c represents the speed of light in vacuum, and Z0 represents the free space wave impedance.

[0062] Depend on Figure 3 The radar absorbing glass is composed of several radar absorbing glass units arranged in rows and columns. The radar absorbing glass unit is the second PMMA dielectric layer. Taking the positive z-axis direction as the top surface, PET (polyterephthalic acid) films are attached to the top and bottom surfaces of the second PMMA dielectric layer, respectively. An ITO (indium tin oxide) film is deposited on the PET film on the bottom surface of the second PMMA dielectric layer as an ITO backplate. A structured ITO film is deposited on the PET film on the top surface of the second PMMA dielectric layer. The structured ITO film adopts a double-ring structure.

[0063] The characteristic impedance Z2 of the radar absorbing glass consists of four parts: the characteristic impedance Z5 of the two-ring ITO film, the characteristic impedance Z6 of the PET film attached to the top surface of the second PMMA dielectric layer, the characteristic impedance Z7 of the second PMMA dielectric layer, and the characteristic impedance Z8 of the PET film attached to the bottom surface of the second PMMA dielectric layer.

[0064] (17),

[0065] The characteristic impedance Z5 of the two-loop ITO thin film is composed of the characteristic impedance Z9 of the outer ITO loop and the characteristic impedance Z of the inner ITO loop. 10 composition.

[0066] (18),

[0067] The outer ring characteristic impedance Z9 is shown in equation (19):

[0068] (19),

[0069] Inner loop characteristic impedance Z 10 As shown in equation (20):

[0070] (20),

[0071] Where j represents the imaginary part, L9 and L 10 For the equivalent inductance, C9 and C 10 R9 is the equivalent capacitance, ω is the angular frequency of the electromagnetic wave, and R2 is the capacitance. 10 This represents the equivalent resistance.

[0072] R9 and R 10 As shown in the following formula:

[0073] (twenty one),

[0074] R s The numbers represent the sheet resistance values ​​of the inner and outer loops, where l1 represents the outer loop side length, w1 is the outer loop line width, l2 represents the inner loop side length, and w2 is the inner loop line width.

[0075] L9 and L 10 As shown in the following formula:

[0076] (twenty two),

[0077] L f1 L f1 and L f3 The third, fourth, and fifth intermediate variables are represented as follows:

[0078] (twenty three),

[0079] Wherein, the F function represents the first intermediate function, calculated as shown in equation (11). P1 represents the period of the radar absorbing glass unit, λ represents the wavelength at the operating frequency, and θ represents the incident angle of the electromagnetic wave.

[0080] C9 and C 10 As shown in the following formula:

[0081] (twenty four),

[0082] C f1 and C f2 The sixth and seventh intermediate variables are represented as follows:

[0083] (25),

[0084] Wherein, the F function represents the first intermediate function, and its calculation is shown in equation (11).

[0085] The characteristic impedances Z6, Z7, and Z8 of the PET film attached to the top surface of the second PMMA dielectric layer and the bottom surface of the second PMMA dielectric layer are as follows:

[0086] (26),

[0087] Wherein, ε6 represents the relative permittivity of the PET film attached to the top surface of the second PMMA dielectric layer, ε7 represents the relative permittivity of the second PMMA dielectric layer, ε8 represents the relative permittivity of the PET film attached to the bottom surface of the second PMMA dielectric layer, h7 represents the thickness of the second PMMA dielectric layer, and h6 and h8 represent the thicknesses of the PET films attached to the top and bottom surfaces of the second PMMA dielectric layer.

[0088] Infrared reflection parameters of a radiation-heat-dissipating absorbing glass with low infrared characteristics. It is determined by the transparent infrared absorption film.

[0089] Depend on Figure 4 It can be seen that the transparent infrared absorption film is composed of several transparent infrared absorption film units arranged in rows and columns. Along the positive z-axis, the infrared absorption film unit is composed of zinc sulfide film and second structured silver film from bottom to top. The second structured silver film adopts a square patch structure.

[0090] Characteristic impedance of infrared absorption film As shown in the following formula:

[0091] (27),

[0092] Among them, Z 11Z represents the characteristic impedance of the square patch structure silver film II. 12 This represents the characteristic impedance of the zinc sulfide film.

[0093] (28),

[0094] Where j represents the imaginary part, L 11 For the equivalent inductance, C 11 R is the equivalent capacitance. 11 This represents the equivalent resistance.

[0095] For the second square patch silver film, its equivalent inductance L 11 Equivalent capacitance C 11 Equivalent resistance R 11 It can be calculated using the following formula:

[0096] (29),

[0097] Wherein, the F function represents the first intermediate function, calculated as shown in equation (11). P 11 Where D is the unit period of the infrared absorption film, and D is the side length of the silver film in the second square patch structure. h represents the conductivity of the silver film in the second square patch structure. 11 The thickness of the silver film in the second square patch structure.

[0098] In the infrared band, the conductivity of the silver film with the second square patch structure is... As shown in the following formula:

[0099] (30),

[0100] in, Represents the angular frequency of electromagnetic waves. This indicates the plasma frequency on the surface of the silver film in the second square patch structure. ε represents the surface damping coefficient of the silver film in the second square patch structure, and ε0 represents the vacuum dielectric constant.

[0101] The characteristic impedance Z of the zinc sulfide film 12 As shown in the following formula:

[0102] (31),

[0103] Where n represents the refractive index of the zinc sulfide film, h 12 This indicates the thickness of the zinc sulfide film.

[0104] Example 1

[0105] like Figure 2The diagram shows a schematic of a radar selective glass unit. As can be seen from the diagram, the radar selective glass is composed of several radar selective glass units arranged in rows and columns. The radar selective glass unit uses a first PMMA dielectric layer, and a first structured silver film is deposited on the top surface of the first PMMA dielectric layer. The first structured silver film adopts a square patch structure.

[0106] The PMMA dielectric layer has a thickness h4 of 1.8 mm, a real part of dielectric constant of 2.25, and a loss tangent of 0.001.

[0107] The silver film has a thickness h3 of 10 nm and an electrical conductivity of 6.3 × 10⁻³. 7 S / m.

[0108] The radar selective glass unit structure has a period P3 of 2 mm.

[0109] The square patch structure has a side length l3 of 1.8 mm.

[0110] Depend on Figure 3 It can be seen that the radar absorbing glass is composed of several radar absorbing glass units arranged in rows and columns. The radar absorbing glass unit is the second PMMA dielectric layer. Taking the positive z-axis direction as the top surface, PET (polyterephthalic acid) films are attached to the top and bottom surfaces of the second PMMA dielectric layer, respectively. An ITO (indium tin oxide) film is deposited on the PET film on the bottom surface of the second PMMA dielectric layer as an ITO backplate. A structured ITO film is deposited on the PET film on the top surface of the second PMMA dielectric layer. The structured ITO film adopts a double-ring structure.

[0111] The PET film has a thickness of 0.175 mm for both h6 and h8, a real part of dielectric constant of 3, and a loss tangent of 0.02.

[0112] The ITO thin film sheet resistance R s It is 12 Ω / sq.

[0113] The PMMA dielectric layer has a thickness h7 of 1.1 mm, a real part of a dielectric constant of 2.25, and a loss tangent of 0.001.

[0114] The radar absorbing glass unit structure has a period P1 of 10 mm.

[0115] The outer ring of the double-ring structure has a side length l1 of 8 mm and a line width w1 of 1 mm, while the inner ring has a side length l2 of 5.6 mm and a line width w2 of 1.35 mm.

[0116] Depend on Figure 4It can be seen that the transparent infrared absorption film is composed of several transparent infrared absorption film units arranged in rows and columns. Along the positive z-axis, the infrared absorption film unit is composed of zinc sulfide film and second structured silver film from bottom to top. The second structured silver film adopts a square patch structure.

[0117] The zinc sulfide film thickness h 12 The wavelength is 150 nm, and the refractive index n is 2.25.

[0118] The second structured silver film thickness h 11 10 nm, plasmon frequency 1.37×10 16 rad / s, damping coefficient It is 2.73 × 10 13 s -1 .

[0119] The transparent infrared absorption film unit structure has a period P. 11 It is 2.6 μm.

[0120] The square patch structure has a side length D of 1.2 μm.

[0121] like Figure 5 The image shows the infrared absorption spectrum of a radiation-dissipating absorbing glass with low infrared characteristics. Figure 5 It is known that the designed low-infrared radiative heat dissipation absorbing glass achieves an absorptivity of 0.94 at a wavelength of 7 μm. According to Kirchhoff's laws, for any object in thermal equilibrium, its absorptivity of electromagnetic waves absorbed at each wavelength is equal to its emissivity of thermal radiation at that wavelength, and this equality holds true at all angles. Therefore, the absorbing glass achieves radiative heat dissipation. Simultaneously, 7 μm is within the non-atmospheric window, and the radiated energy cannot be detected; therefore, the radiation of 7 μm infrared waves by the absorbing glass does not increase its own infrared characteristics. Based on this, the absorbing glass proposed in this invention achieves an infrared emissivity of less than 0.08 in the 3-5 μm and 8-14 μm bands, realizing low emissivity for the infrared atmospheric window. Therefore, the designed absorbing glass achieves low infrared characteristics throughout the 3-14 μm band while simultaneously achieving radiative heat dissipation.

[0122] like Figure 6 The figure shows the radar absorption spectrum of a radiation-heat-dissipating absorbing glass with low infrared characteristics. As can be seen from the figure, the absorbing glass achieves more than 90% effective broadband electromagnetic absorption of radar waves in the frequency band of 7.5-13.9 GHz.

[0123] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. It should be noted that any improvements and modifications made within the spirit and principles of the present invention should be considered within the scope of protection of the present invention.

[0124] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this application. It should be understood that the above description is only a specific embodiment of this application and is not intended to limit the scope of protection of this application. Any modifications, equivalent substitutions, improvements, etc., made on the basis of the technical solution of this application should be included within the scope of protection of this application.

Claims

1. A radiation heat dissipation type wave absorbing glass having low infrared characteristics, characterized by: The radar wave-absorbing glass, the radar wave-selecting glass and the transparent infrared absorption film are sequentially arranged from bottom to top along the positive direction of the z axis; the three layers of structures are all periodic arrangements of artificial structure units along the x and y directions; the radar wave-absorbing glass is composed of an ITO film plated on a PET film, a PMMA layer and a structured ITO film plated on a PET film along the positive direction of the z axis, and the structured ITO film adopts a double-square-ring configuration; the radar wave-selecting glass is composed of a PMMA dielectric layer and a structured silver film along the positive direction of the z axis, and the structured silver film adopts a square patch configuration; and the transparent infrared absorption film is composed of a zinc sulfide film and a structured silver film along the positive direction of the z axis, and the structured silver film adopts a square patch configuration. 2.The radiation heat dissipation type wave-absorbing glass with low infrared characteristics according to claim 1, characterized in that: The electromagnetic wave absorption rate is shown in formula (1): (1)， where S 11 represents the reflection S-parameters, S 21 represents the transmission S-parameters; The reflection parameter S 11 The relationship with the reflection coefficient Γ is shown in equation (2): (2)， The relationship between the reflection coefficient and the characteristic impedance is shown in formula (3): (3)， Wherein, Z0 represents the wave impedance of free space. 3.The radiation heat dissipation type wave-absorbing glass with low infrared characteristics according to claim 2, characterized in that: Radar reflection parameter S 11 Determined by the radar wave-absorbing glass and the radar wave-selecting glass together; Radar characteristic impedance Z in As shown in equation (4): (4)， Wherein, Z1 represents the characteristic impedance of the radar wave-selecting glass, and Z2 represents the characteristic impedance of the radar wave-absorbing glass.

4. The radiation heat dissipation type wave absorbing glass with low infrared characteristics according to claim 3, characterized in that: The radar wave-selecting glass is composed of a plurality of radar wave-selecting glass units arranged in rows and columns, and the radar wave-selecting glass unit is a first PMMA dielectric layer, the top surface of which is plated with a first structured silver film, and the first structured silver film adopts a square patch structure.

5. The radiation heat dissipation type wave absorbing glass with low infrared characteristics according to claim 4, characterized in that: The characteristic impedance Z1 of the radar wave-selecting glass is composed of two parts, one is the characteristic impedance Z3 of the first square patch silver film, and the other is the characteristic impedance Z4 of the first PMMA dielectric layer. (5)， The expression of the characteristic impedance Z3 of the square patch silver film is as follows: (6)， Wherein, j represents the imaginary part, L3 is the equivalent inductance, C3 is the equivalent capacitance, ω is the angular frequency of the electromagnetic wave, and R3 represents the equivalent resistance; For the square patch silver film, the equivalent inductance L3 is calculated by the following formula: (7)， The equivalent capacitance C3 of the square patch silver film is calculated by the following formula: (8)， Wherein, l3 represents the side length of the square patch silver film, P3 is the period of the radar wave-selecting glass unit, λ represents the wavelength at the working frequency, and θ represents the incident angle of the electromagnetic wave; For the equivalent inductance correction factor, as follows: (9)， The equivalent capacitance correction factor is as follows: (10)， The F function represents the first intermediate function, and is calculated as shown in formula (11): (11)， Wherein, the G function represents the second intermediate function, and is calculated as shown in formula (12): (12)， Wherein, A represents the first intermediate variable, as shown in formula (13): (13)， β represents the second intermediate variable, as shown in formula (14): (14)， Wherein, m1, m2, m3 and m4 are free variables, which are replaced by the parameters in formulas (7)-(8); The equivalent resistance R3 of the square patch silver film is shown in formula (15): (15)， Wherein, σ3 represents the conductivity of the first square patch silver film, and h3 represents the thickness of the first square patch silver film. The characteristic impedance Z4 of the first PMMA dielectric layer is shown in formula (16): (16)， Wherein, ε4 represents the relative dielectric constant of the first PMMA dielectric layer, f represents the frequency of the incident electromagnetic wave, h4 represents the thickness of the first PMMA dielectric layer, c represents the speed of light in vacuum, and Z0 represents the wave impedance of free space.

6. The radiation heat dissipation type wave absorbing glass with low infrared characteristics according to claim 5, characterized in that: The radar wave absorbing glass is composed of a plurality of radar wave absorbing glass units arranged in rows and columns, the radar wave absorbing glass unit is a second PMMA dielectric layer, the positive direction of a z axis is a top surface, a PET film is attached to the top surface and the bottom surface of the second PMMA dielectric layer, an ITO film is plated on the PET film at the bottom surface of the second PMMA dielectric layer as an ITO back plate, a structured ITO film is plated on the PET film at the top surface of the second PMMA dielectric layer, and the structured ITO film adopts a double-ring structure.

7. The radiation heat dissipation type wave absorbing glass with low infrared characteristics according to claim 6, characterized in that: The characteristic impedance Z2 of the radar wave absorbing glass is composed of four parts, one is the characteristic impedance Z5 of the double-ring ITO film, the second is the characteristic impedance Z6 of the PET film attached to the top surface of the second PMMA dielectric layer, the third is the characteristic impedance Z7 of the second PMMA dielectric layer, and the fourth is the characteristic impedance Z8 of the PET film attached to the bottom surface of the second PMMA dielectric layer. (17)， The characteristic impedance Z5 of the double-ring ITO film is determined by the characteristic impedance Z9 of the outer ITO ring and the characteristic impedance Z 10 composition; (18)， The characteristic impedance Z9 of the outer ring is shown in formula (19): (19)， Inner loop characteristic impedance Z 10 As shown in equation (20): (20)， where j represents the imaginary part, L9and L 10 are equivalent inductances, C9and C 10 are equivalent capacitances, ω is the angular frequency of the electromagnetic wave, R9and R 10 represent equivalent resistances; R9and R 10 as follows: (21)， R s R represents the square resistance value of the inner and outer rings, l1 represents the side length of the outer ring, w1 is the line width of the outer ring, l2 represents the side length of the inner ring, and w2 is the line width of the inner ring. L9 and L 10 As shown in the following formula: (22)， L f1 , L f1 and L f3 represent third, fourth, fifth intermediate variables, as follows: (23)， Wherein, the F function represents a first intermediate function, and the calculation is shown in formula (11); P1 represents the period of the radar wave absorbing glass unit, λ represents the wavelength at the working frequency, and θ represents the electromagnetic wave incidence angle. C9 and C 10 As follows: (24)， C f1 and C f2 represent the sixth, seventh intermediate variables, as follows: (25)， Wherein, the F function represents a first intermediate function, and the calculation is shown in formula (11).

8. The radiation heat dissipation type wave absorbing glass with low infrared characteristics according to claim 7, characterized in that: The characteristic impedance Z6 of the PET film attached to the top surface of the second PMMA dielectric layer, the characteristic impedance Z7 of the second PMMA dielectric layer, and the characteristic impedance Z8 of the PET film attached to the bottom surface of the second PMMA dielectric layer are as follows: (26)， Wherein, ε6 represents the relative dielectric constant of the PET film attached to the top surface of the second PMMA dielectric layer, ε7 represents the relative dielectric constant of the second PMMA dielectric layer, ε8 represents the relative dielectric constant of the PET film attached to the bottom surface of the second PMMA dielectric layer, h7 represents the thickness of the second PMMA dielectric layer, and h6 and h8 represent the thickness of the PET film attached to the top surface and the bottom surface of the second PMMA dielectric layer.

9. The radiation heat dissipation type wave absorbing glass with low infrared characteristics according to claim 8, characterized in that: Infrared reflection parameters determined by the transparent infrared absorbing film; The transparent infrared absorbing film is composed of a plurality of transparent infrared absorbing film units arranged in rows and columns, along the positive direction of a z axis, the infrared absorbing film unit is sequentially composed of a zinc sulfide film and a second structured silver film from bottom to top, and the second structured silver film adopts a square patch structure. Characteristic impedance of infrared absorbing film The following formula: (27)， wherein Z 11 represents the characteristic impedance of the square patch structure silver film two, Z 12 represents the characteristic impedance of the zinc sulfide film; (28)， where j represents the imaginary part, L 11 is the equivalent inductance, C 11 is the equivalent capacitance, R 11 represents the equivalent resistance; For the second square patch silver film, the equivalent inductance L 11 , the equivalent capacitance C 11 , and the equivalent resistance R 11 are calculated by the following equations: (29)， Wherein, the F function represents a first intermediate function, and the calculation is shown in formula (11); P 11 D is the side length of the second square patch structure silver film, σ represents the conductivity of the second square patch structure silver film, h 11 is the thickness of the second square patch structure silver film; In the infrared wave band, the conductivity of the second square patch structure silver film as follows: (30)， wherein, represents the electromagnetic wave angular frequency, represents the second square patch structure silver film surface plasmon frequency, represents the second square patch structure silver film surface damping coefficient, and ε0represents the vacuum permittivity; characteristic impedance Z of the zinc sulfide film 12 as follows: (31)， where n represents the refractive index of the zinc sulfide film, h 12 represents the thickness of the zinc sulfide film.

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