CN113036443B - Optically transparent electromagnetic super-surface for reducing broadband and wide-angle RCS - Google Patents
Optically transparent electromagnetic super-surface for reducing broadband and wide-angle RCS Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
- H01Q15/0086—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices having materials with a synthesized negative refractive index, e.g. metamaterials or left-handed materials
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- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/002—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of materials engineered to provide properties not available in nature, e.g. metamaterials
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
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Abstract
The invention discloses an optical transparent electromagnetic super surface for reducing broadband and wide-angle RCS (radar cross section), which is composed of three Indium Tin Oxide (ITO) thin film layers and two polyethylene terephthalate (PET) medium layers, wherein the surface layer and the middle ITO layer are respectively composed of N multiplied by N super surface modules in checkerboard arrangement; the super-surface modules respectively consist of M multiplied by M basic units, each adjacent super-surface module is distributed along the center in a clockwise rotating mode, the upper ITO layer consists of a group of L-shaped patches distributed along the diagonal line, the middle ITO layer consists of a group of L-shaped patches distributed along the diagonal line and a group of arched strips, and the super-surface module further comprises a bottom ITO layer reflecting plate. The invention solves the problem that the prior art is difficult to realize the compatibility of RCS reduction and optical transparency, has the advantages of good broadband and wide-angle RCS reduction performance, optical transparency and the like, and has potential application in scenes needing optical transparency or perspective observation and RCS reduction at the same time.
Description
Technical Field
The invention belongs to the field of novel artificial electromagnetic materials, relates to an electromagnetic super surface, and particularly relates to an optical transparent electromagnetic super surface for reducing broadband and wide-angle RCS.
Background
The continuous development of modern radar detection technology poses a severe threat to low-scattering platforms. The existing scattering suppression technology comprises appearance design and coating of radar absorbing materials. The suppression of scattering by the shape technology usually changes the original morphological characteristics of the platform to destroy the aerodynamic performance, and has the defects of narrow scattering bandwidth, poor angular stability and the like. The radar absorbing material can effectively reduce the scattering intensity, but the application scenes are limited due to various factors such as volume, weight and the like. Furthermore, for scenes with both optically transparent or visually observable and scatter suppression requirements, it is difficult to meet their compatibility requirements with existing scatter suppression technologies.
The artificial electromagnetic material is formed by periodically arranging artificial electromagnetic structures with sub-wavelengths, can flexibly regulate and control the amplitude, phase, polarization and other characteristics of electromagnetic waves, and has application potential in the aspect of scattering inhibition. The electromagnetic super surface belongs to a two-dimensional representation form of an artificial electromagnetic material and is formed by two-dimensional arrangement of super surface units. The electromagnetic super-surface has the advantages of low profile, simple structure, easy processing and the like, and is widely applied to various fields such as antennas, microwave and terahertz devices, optoelectronic devices and the like.
With the continuous and intensive research on the electromagnetic super-surface, various super-surface structures such as a polarization conversion super-surface, a phase gradient super-surface, a frequency selection super-surface, a metamaterial absorber and the like are provided aiming at RCS reduction, and the remarkable RCS reduction effect is realized. In 2018, Yajiang Zhuang et al published a paper named Low-scattering tri-band metrology using combination of dispersion adsorption and compensation in the IEEE Access journal, and the paper realizes effective RCS reduction effect by performing combined design on super-surface structures with different functions working in different frequency bands, but the super-surface needs to design two super-surface units working in different frequency bands, and the working mechanisms of the units in the super-surface are independent. In addition, because the super surface adopts a sandwich structure of metal-medium-metal, the super surface is optically non-transparent and is not suitable for scenes needing optical transparency or visual observation requirements.
Aiming at the scenes such as the window position of a low-scattering platform and the like which need to take optical transparency and low-scattering characteristics into consideration, the design of the electromagnetic super-surface with high optical transparency and good RCS reduction performance is of great significance.
Disclosure of Invention
In order to solve the above-mentioned defects in the prior art, the present invention provides an optically transparent electromagnetic super-surface with a reduced broadband and wide-angle RCS for solving the problem that the existing scattering suppression technology cannot meet the requirements of both optically transparent scenes and visual observation and scattering suppression, which is used for meeting the requirements of the prior art that the reduction of broadband and wide-angle RCS cannot be achieved and that special scenes such as platform windows and the like are also considered for optically transparent scenes or visual observation.
The invention is realized by the following technical scheme.
The invention provides an optical transparent electromagnetic super-surface for reducing broadband and wide-angle RCS (radar cross section), which comprises two PET (polyethylene terephthalate) medium layers and three ITO (indium tin oxide) layers, wherein a surface ITO layer is printed on the upper surface of the upper PET medium layer, a middle ITO layer is printed on the upper surface of the lower PET medium layer and is tightly attached to the lower surface of the upper PET medium layer; the bottom ITO layer is printed on the lower surface of the lower PET medium layer. The formed multilayer electromagnetic super surface is beneficial to reducing the Q value of the super surface so as to widen the bandwidth of the super surface.
The surface layer ITO layer and the middle layer ITO layer are respectively composed of N multiplied by N super surface modules which are arranged in a chessboard manner; the super-surface module is composed of M multiplied by M basic units, N is more than or equal to 2, M is more than or equal to 2, effective resonance can be generated on low-frequency-band incident waves, and the super-surface module is beneficial to the reduction performance of broadband RCS of the super-surface. Each adjacent super-surface module is distributed along the center in a clockwise rotating mode, the scattering energy is redirected by using the anti-phase characteristic between the adjacent super-surface modules, and effective RCS reduction can be achieved.
The three ITO layers made of the transparent conductive film are beneficial to absorbing and converting partial scattering energy into heat energy through ohmic loss, a mixed mechanism of an absorption mechanism and a polarization conversion mechanism is realized in the same structure, and the broadband and wide-angle RCS (remote control system) reduction performance of the super surface is realized.
Furthermore, the super-surface module I on the surface layer ITO layer is composed of M multiplied by M basic units I, and the basic units I are composed of a group of L-shaped patches I which are arranged on the upper surface of the upper layer PET medium layer along the diagonal line.
Furthermore, the super-surface module of the middle ITO layer is composed of M multiplied by M basic units II, and each basic unit II is composed of a group of L-shaped patches II which are distributed on the upper surface of the lower PET medium layer along the diagonal line and a group of middle bent arched strips which are symmetrically distributed relative to the adjacent diagonal line.
The structure is beneficial to simulating infinite period conditions so as to reduce the coupling effect between the basic units forming the super-surface module, is beneficial to generating resonance on the broadband incident wave, realizes effective RCS reduction performance under the broadband incident wave, and ensures that TE and TM waves in the broadband have the same frequency response and realize polarization stability due to the symmetrical distribution.
Furthermore, the arched strips are positioned between the L-shaped patches II, the length of the strips at the bending positions is the same as the width of the openings of the two arms of the L-shaped patches II, and the thickness of the strips at the bending positions is the same as that of the L-shaped patches II; the structure can reduce the structural parameters of the basic unit II and the complexity of structural design.
The distance between the strip at the bent part and the end parts of the two arms of the L-shaped patch is not less than the width of the single arm of the L-shaped patch, so that the coupling effect between the arched strip and the L-shaped patch is utilized, and the frequency response effect of the basic unit II on the medium-frequency-band incident waves is improved.
Furthermore, the periodic pitches P of the basic unit I and the basic unit II are the same, which is beneficial to forming the super-surface module I and the super-surface module II with the same size, so that the super-surface formed by clockwise rotating distribution of the center has symmetrical distribution characteristics, and the polarization stability of the super-surface is realized.
Furthermore, two arms of the L-shaped patch I and the L-shaped patch II are symmetrical about a diagonal, so that the L-shaped patch I and the L-shaped patch II have polarization insensitivity to TE and TM incident waves. The length and the width of the single arm of the L-shaped patch I are smaller than those of the single arm of the L-shaped patch II, and the difference of structural parameters is beneficial to improving the frequency response characteristic of high-frequency-band incident waves.
Furthermore, the surface layer ITO layer, the middle layer ITO and the bottom layer ITO layer are made of transparent conductive indium tin oxide materials, and the polarization conversion mechanism and the absorption mechanism can be integrated in the same structure by utilizing the characteristics of certain sheet resistance and conductivity of the transparent conductive indium tin oxide, so that the broadband and wide-angle RCS (remote control system) reduction performance and the optical transparency of the super surface are realized.
Furthermore, the upper PET medium layer and the lower PET medium layer are made of polyethylene glycol terephthalate materials, so that the super-surface optical transparency is realized.
Furthermore, the upper PET medium layer and the lower PET medium layer are the same in thickness, the relative dielectric constant is 2.5-4.5, the loss tangent is 0.01-0.03, the moderate relative dielectric constant is beneficial to realizing a basic unit structure with a low Q value, the broadband RCS reduction performance of the super surface is realized, the large loss tangent can reduce the amplitude of scattered waves through dielectric loss, and the broadband RCS reduction performance of the super surface is beneficial to.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
the optical transparent electromagnetic super-surface integrates two mechanisms of absorption and polarization conversion of electromagnetic waves into the same unit structure, completes the structural design of a mixed mechanism of the super-surface, has symmetry simultaneously, enables the unit to have higher incident angle stability, effectively expands the reduction bandwidth of RCS by a two-layer structure nesting method, and can realize RCS reduction of more than 10dB in a wide frequency range of 7.47-30.06 GHz. The absorption conversion rate ACR of the hybrid super-surface is more than 90% in the frequency range of the co-polarization reflection coefficient less than-10 dB, and the polarization conversion rate is more than 0.8 in the frequency ranges of 8-16GHz, 20.5-24GHz and 26.5-30.5 GHz. Meanwhile, the traditional metal patch is replaced by a transparent conducting film such as ITO (indium tin oxide) and the like, and the traditional opaque medium substrate is replaced by a transparent material such as PET (polyethylene terephthalate) and the like, so that the super-surface structure has good optical transparency, and can be applied to scenes needing to give consideration to both optical transparency or visual observation and RCS (radar cross section) reduction and low scattering characteristics.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention:
FIG. 1 is a schematic diagram of the overall structure of an embodiment of the present invention;
FIG. 2(a) shows an arrangement of ITO on the surface layer of the optically transparent electromagnetic super surface in the embodiment of the present invention; FIG. 2(b) and the structure diagram of the basic unit I thereof;
FIG. 3 is a layout of a layer of ITO on an optically transparent electromagnetic super surface according to an embodiment of the present invention;
FIG. 4 is a structural diagram of a layer ITO basic unit II in the embodiment of the present invention;
FIG. 5(a) is a graph of S-parameter simulation results for an optically transparent electromagnetic super-surface unit according to an embodiment of the present invention; FIG. 5(b) is a graph showing the results of the absorption conversion rate, the conversion rate and the wave absorption rate of the super-surface unit calculated according to the above;
FIG. 6(a) is a graph comparing polarization conversion and conversion for an optically transparent electromagnetic super-surface element according to an embodiment of the present invention; FIG. 6(b) is a graph of the results of the reflection phase and phase difference of an optically transparent electromagnetic super-surface element and its element rotated 90 °;
FIG. 7(a) is a graph showing the wave-absorbing conversion rate of the optically transparent electromagnetic super-surface unit according to the embodiment of the present invention under TE wave incidence at different incidence angles; FIG. 7(b) is a graph showing the results of the wave-absorbing conversion rate of the optically transparent electromagnetic super-surface unit under the incidence of TM waves at different incidence angles;
FIG. 8(a) is a graph of the results of RCS reduction at different angles of incidence for an optically transparent electromagnetic meta-surface of an embodiment of the present invention at TE wave incidence compared to a metal plate of the same dimensions; FIG. 8(b) is a graph of the results of RCS reduction at different angles of incidence for an optically transparent electromagnetic super-surface at TM wave incidence compared to a metal plate of the same dimensions;
FIGS. 9(a) and (b) are graphs comparing the three-dimensional scattering patterns of the optically transparent electromagnetic super-surface and the same-sized metal plate at 5 frequency points, such as 9GHz, 14GHz, 19GHz, 24GHz and 29GHz, under the condition of vertical incidence of TE mode electromagnetic waves; fig. 9(a) shows a case where an electromagnetic wave is perpendicularly incident on the optically transparent electromagnetic super surface, and fig. 9(b) shows a case where an electromagnetic wave is perpendicularly incident on the same-sized metal plate.
In the figure: 1. a surface ITO layer; 2. a middle ITO layer; 3. a bottom ITO layer; 4. an upper PET medium layer; 5. a lower PET medium layer; 11. a super-surface module I; 111. a basic unit I; 1111. an L-shaped patch I; 21. a super-surface module II; 211. a basic unit II; 2111. an L-shaped patch II; 2112. an arcuate strip.
Detailed Description
The present invention will now be described in detail with reference to the drawings and specific embodiments, wherein the exemplary embodiments and descriptions of the present invention are provided to explain the present invention without limiting the invention thereto.
Referring to fig. 1, the optically transparent electromagnetic super surface of the present embodiment includes three transparent conductive indium tin oxide ITO layers 1, 2, 3 and two polyethylene terephthalate PET dielectric layers 4, 5; the surface layer ITO layer 1 is printed on the upper surface of the upper layer PET medium layer 4; the middle ITO layer 2 is printed on the upper surface of the lower PET medium layer 5 and is tightly attached to the lower surface of the upper PET medium layer 4; the bottom ITO layer 3 is printed on the lower surface of the lower PET layer 5; the thicknesses of the two layers of PET medium layers are the same, and a 60mm multiplied by 4mm super-surface whole body is formed.
Referring to fig. 2(a), the surface ITO layer 1 is composed of 2 × 2 super surface modules i 11; the super-surface module I11 is composed of 5 multiplied by 5 basic units I111, adjacent super-surface modules are distributed along the center in a clockwise rotating mode, 0 and 1 in the drawing respectively represent two adjacent different super-surface modules, and the super-surface module 0 is a super-surface module 1 after being rotated by 90 degrees clockwise.
Referring to fig. 2(b), the basic unit i 111 of the super-surface module i 11 is composed of a group of L-shaped patches i 1111 arranged along the diagonal line on the upper surface of the upper PET dielectric layer. In this embodiment, the two arms of the L-shaped patch I1111 are symmetrical with respect to the diagonal, the single arm has a length L1 of 1.0mm to 3.0mm, a width W1 of 0.2mm to 0.8mm, and a unit period pitch P of 4mm to 10 mm. This embodiment uses, but is not limited to, L1-2.05 mm, W1-0.4 mm, and P-6 mm.
Referring to fig. 3, the super-surface structure module ii 21 is composed of 2 × 2 super-surface modules ii 21; the super-surface module II 21 is composed of 5 × 5 basic units II 211, adjacent basic unit structures are distributed along the center in a clockwise rotation mode, similarly, "0" and "1" in the drawing respectively represent two adjacent different structural basic units, and after the "0" basic unit structure is rotated by 90 degrees clockwise, the "1" basic unit structure is formed.
As shown in fig. 4, the basic unit ii 211 is composed of a group of L-shaped patches ii 2111 arranged on the upper surface of the lower PET medium layer along the diagonal line and a group of middle bent arched strips 2112 symmetrically distributed about the adjacent diagonal line, the arched strips 2112 are located between the L-shaped patches ii 2111, the length L3 of the bent strips is the same as the width of the openings of the two arms of the L-shaped patches ii 2111, and the thickness W3 of the bent strips is the same as the thickness W2 of the L-shaped patches ii 2111; the distance between the strip at the bent part and the end parts of the two arms of the L-shaped patch II 2111 is not less than the width of the single arm of the L-shaped patch II 2111.
In this embodiment, the two arms of the L-shaped patch 2111 are symmetrical about a diagonal, with a single arm length L2 of 1.0mm to 3.0mm and a width W2 of 0.2mm to 0.8 mm; the middle arched strip 2112 is positioned between the L-shaped patches 2111, the length L3 of the strip at the bending part is 1.5mm-3.2mm, the width W3 is 0.2mm-0.8mm, the length L4 of the strip at the two sides is 1.0mm-2.0mm, and the width W4 is 0.5mm-1.5 mm. This example uses, but is not limited to, 2.26mm for L2, 0.5mm for W2, 2.3mm for L3, 0.5mm for W3, 1.65mm for L4, and 0.7mm for W4.
In the embodiment, the period pitch P of the basic unit I111 is the same as that of the basic unit II 211; the two arms of the L-shaped patch I1111 and the L-shaped patch II 2111 are symmetrical about a diagonal line, and the length and the width of one arm of the L-shaped patch I1111 and the L-shaped patch II 2111 are the same. The upper PET medium layer and the lower PET medium layer have the same thickness, the relative dielectric constant is 2.5-4.5, and the loss tangent is 0.01-0.03. The sheet resistance of the ITO film is 5-20 omega, but the sheet resistance adopted in the embodiment is not limited to 6 omega.
The working principle of the embodiment is as follows:
the optical transparent electromagnetic super-surface can convert incident electromagnetic waves into cross polarized waves by utilizing a polarization conversion principle, the working bandwidth of the optical transparent electromagnetic super-surface is expanded by a structure nesting method, the super-surface module rotates clockwise along the center of a structure, the reflection phase inversion of adjacent modules can be realized, and scattered beams can be redirected to the directions of four corners according to a phase cancellation principle; meanwhile, the ITO thin film material with a specific resistance value is adopted to replace the traditional metal material, ohmic loss is introduced to realize the conversion from electromagnetic energy to heat energy, the effective absorption of incident electromagnetic waves can be realized in a specific frequency range, the echo energy in a threat angle range is reduced, and the purpose of RCS reduction is achieved; in addition, because the floor also adopts the ITO film, and the medium substrate adopts the PET material with optical transparency, the super surface has high optical transparency as a whole, and the super surface can be applied to scenes which need optical transparency or perspective observation and RCS reduction at the same time.
The specific principle of the design of the mixing mechanism of the optically transparent electromagnetic super-surface of the embodiment is as follows:
the mixing mechanism of the optical transparent electromagnetic super-surface of the embodiment is mainly analyzed by two parts, namely a wave-absorbing principle and a polarization conversion principle:
according to the wave absorption principle analysis, the absorptivity of the super-surface unit can be expressed as:
wherein
And
co-polarized and cross-polarized reflection coefficients and transmission coefficients, respectively. Since the reflective plate employs the ITO film with low impedance, the electromagnetic wave is almost totally reflected, the transmission coefficients of the two polarizations can be approximated to 0, and the absorption rate of the super-surface unit can be defined as:
according to the polarization Conversion principle, Conversion is defined as the ratio of polarization Conversion of incident waves into cross-polarized waves, which is expressed as:
considering both the absorbed and converted electromagnetic energy, the absorption conversion ACR of a super-surface unit can be defined as:
as can be seen from the formula (4), for the super-surface unit of this embodiment, the absorption conversion rate is composed of two parts, one part is from the wave-absorbing effect of the wave-absorbing principle, and the other part is from the conversion effect of the polarization conversion principle, which indicates that the super-surface unit realizes the mixing of the two mechanisms.
The technical effects of the invention are further explained by combining simulation experiments as follows:
simulation software: full-wave simulation software HFSS — 15.0.
Simulation content and results:
As can be seen from FIG. 5(a), the super surface unit of this embodiment has a transmission coefficient of less than-25 dB in the frequency range of 6GHz-34GHz, because the lowest layer employs an ITO film with low impedance, and the electromagnetic wave is almost totally reflected. And in the frequency range of 7.44GHz-31.31GHz, the co-polarization reflection coefficient is less than-10 dB, and the cross-polarization reflection coefficient is not close to 0. It follows that the incident electromagnetic wave energy is divided into three components, reflected waves, absorbed waves and converted into cross-polarized waves.
As can be seen from fig. 5(b), the absorption conversion rate ACR of the super-surface unit in this embodiment is greater than 90% in the frequency range where the co-polarization reflection coefficient is less than-10 dB, so that the super-surface unit has a higher polarization conversion rate in the frequency range where the wave absorption rate is lower and a higher wave absorption rate in the frequency range where the polarization conversion rate is lower, and the electromagnetic wave regulation performance is significantly improved due to the synergistic effect of the two mechanisms.
As can be seen from FIG. 6(a), the polarization conversion rate of the super-surface unit in this embodiment is greater than 0.8 in the frequency ranges of 8-16GHz, 20.5-24GHz and 26.5-30.5GHz, and represents the ratio of the incident wave converted into its cross-polarized wave to the residual energy not containing absorbed and dissipated part of the energy.
As can be seen from FIG. 6(b), the reflection phase difference of the super-surface unit of the present embodiment and the mirror super-surface unit after the super-surface unit rotates 90 degrees from its central symmetry is within 180 + -37 deg. in the frequency ranges of 7-23GHz and 28-30.5GHz, so that the phase cancellation of the scattered waves can be realized, and the scattering peak in the threat angle range is reduced.
As can be seen from fig. 7(a) and (b), in the range of 0 ° to 45 °, the wave-absorbing conversion rate is greater than 80% (in the case of TM wave incidence, it exceeds 90%), and although the wave-absorbing conversion rate is reduced at approximately 60 °, a significant absorbing conversion effect is still exhibited, indicating that the super-surface unit of the present embodiment has a high incident angle stability.
As can be seen from FIGS. 8(a) and (b), the super-surface of the present embodiment achieves a broadband RCS reduction effect for both TE and TM waves at different incident angles, and achieves an RCS reduction effect of more than 10dB in the 7.47-30.06GHz band for normal incidence. Fig. 8(a) shows the TE wave incident condition, and fig. 8(b) shows the TM wave incident condition.
Simulation 7, selecting 5 frequency points such as 9GHz, 14GHz, 19GHz, 24GHz, 29GHz and the like under the TE wave vertical incidence condition, and performing simulation calculation on the three-dimensional scattering directional diagrams of the super surface and the metal plate with the same size in the embodiment, where the results are shown in fig. 9(a) and fig. 9(b), where fig. 9(a) is the scattering directional diagram of the super surface in the embodiment, and fig. 9(b) is the scattering directional diagram of the metal plate with the same size.
As can be seen from fig. 9(a), (b), compared with the metal plate, due to the clockwise arrangement of the super-surface modules, a reflected wave phase difference of 180 ± 37 ° is introduced between adjacent modules, so that the three-dimensional scattering pattern of the super-surface of the present embodiment is in a four-beam shape, and at the same time, the intensity of the reflected wave is lower than that of the reflected wave of the metal plate, because part of the energy is absorbed by the super-surface of the present embodiment, thereby also proving the correctness and effectiveness of the mixing mechanism of the super-surface of the present embodiment.
The present invention is not limited to the above-mentioned embodiments, and based on the technical solutions disclosed in the present invention, those skilled in the art can make some substitutions and modifications to some technical features without creative efforts according to the disclosed technical contents, and these substitutions and modifications are all within the protection scope of the present invention.
Claims (8)
1. The optical transparent electromagnetic super-surface for reducing the broadband and wide-angle RCS is characterized by comprising two PET medium layers (4, 5) and three ITO layers (1, 2, 3), wherein the upper surface of the upper PET medium layer (4) is printed with a surface ITO layer (1), the upper surface of the lower PET medium layer (5) is printed with a middle ITO layer (2) and is tightly attached to the lower surface of the upper PET medium layer (4); the bottom ITO layer (3) is printed on the lower surface of the lower PET medium layer (5);
the surface layer ITO layer (1) and the middle layer ITO layer (2) are respectively composed of N multiplied by N super surface modules (11, 21) which are arranged in a chessboard manner; the super-surface modules (11, 21) are respectively composed of M multiplied by M basic units, N is more than or equal to 2, and M is more than or equal to 2; each adjacent super-surface module is distributed along the center in a clockwise rotating manner, and the three ITO layers (1, 2 and 3) are transparent conductive films;
the super-surface module II (21) of the middle layer ITO (2) is composed of M multiplied by M basic units II (211), and the basic units II (211) are composed of a group of L-shaped patches II (2111) which are distributed on the upper surface of the lower layer PET medium layer along the diagonal line and a group of middle bent arched strips (2112) which are symmetrically distributed relative to the adjacent diagonal line;
the super-surface module I (11) of the surface ITO layer (1) is composed of M multiplied by M basic units I (111), and the basic units I (111) are composed of a group of L-shaped patches I (1111) which are arranged on the upper surface of the upper PET medium layer along the diagonal line; the arched strips (2112) are located between L-shaped patches II (2111).
2. The optically transparent electromagnetic super-surface for broadband and wide-angle RCS reduction according to claim 1, wherein the length of the strip at the bend is the same as the width of the opening of the two arms of the L-shaped patch ii (2111), and the thickness of the strip at the bend is the same as the thickness of the L-shaped patch ii (2111); the distance between the strip at the bent part and the end parts of the two arms of the L-shaped patch II (2111) is not less than the width of the single arm of the L-shaped patch II (2111).
3. The optically transparent electromagnetic super-surface for broadband and wide angle RCS reduction of claim 1, wherein the periodic pitch P of the elementary cells i (111) and ii (211) is the same.
4. The optically transparent electromagnetic super surface for broadband and wide angle RCS reduction of claim 1, wherein the L-shaped patch i (1111) is symmetric with the L-shaped patch ii (2111) about a diagonal, and the L-shaped patch i (1111) has a smaller one-arm length and width than the L-shaped patch ii (2111).
5. The optically transparent electromagnetic super-surface for broadband and wide angle RCS reduction of claim 1, wherein the top (1), middle (2) and bottom (3) ITO layers are transparent conductive indium tin oxide materials.
6. The optically transparent electromagnetic super-surface for broadband and wide angle RCS reduction according to claim 1, wherein said upper PET dielectric layer (4) and lower PET dielectric layer (5) are polyethylene terephthalate materials.
7. The optically transparent electromagnetic metasurface for broadband and wide angle RCS reduction according to claim 1, wherein the upper PET dielectric layer (4) and the lower PET dielectric layer (5) are the same thickness, have a relative dielectric constant of 2.5-4.5 and a loss tangent of 0.01-0.03.
8. The optically transparent electromagnetic meta-surface for broadband and wide angle RCS reduction of any one of claims 1-7, wherein the electromagnetic meta-surface has an absorption conversion ACR greater than 90% in the frequency range with co-polarized reflectance less than-10 dB and a polarization conversion greater than 0.8 in the frequency range of 8-16GHz, 20.5-24GHz, and 26.5-30.5 GHz.
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