A dual-polarized ultrathin A-T-A electromagnetic metamaterial and a radome and an antenna system thereof

Abstract

A kind of bipolarization ultrathin A-T-A electromagnetic metamaterial and antenna cover, antenna system, the electromagnetic metamaterial is virtually divided into multiple periodic square unit structures, the square unit structure includes two identical dielectric substrates parallelly facing with air layer, the surface of the dielectric substrate is respectively provided with bright mode resonator unit along x direction and y direction, the bright mode resonator unit includes high frequency end electric dipole corresponding to in side and low frequency end electric dipole corresponding to out side, another surface is respectively provided with dark mode resonator unit along x direction and y direction, the dark mode resonator unit includes high frequency end comb coil and low frequency end comb coil corresponding to the high frequency end electric dipole and the low frequency end electric dipole respectively, the resonator of two dielectric substrates is uniformly distributed along x, y, z any direction.The application has wave-absorbing frequency band and wave-transparent frequency band simultaneously, has the advantages of ultralow profile, super-wide passband, easy to conform.

Description

Technical Field

[0001] This invention relates to the field of electromagnetic metamaterials technology, specifically to a dual-polarized ultrathin ATA electromagnetic metamaterial and its radome and antenna system. Background Technology

[0002] In the application of radomes in radar and communication systems, there is a clear demand for radomes that are both electromagnetically transparent and out-of-band stealth. Such radomes can be achieved using absorptive-transparent-absorptive (ATA) electromagnetic metamaterials that simultaneously transmit and absorb waves. Currently, the mainstream design of ATA electromagnetic metamaterials involves separating a transparent screen and an absorbing screen with a quarter-air gap between them. Within the absorption band, the electromagnetic properties of the transparent screen are equivalent to a metallic reflector. When an electromagnetic wave is incident, the transparent screen reflects it back. At a quarter wavelength in front of the transparent screen, the incident and reflected waves are in phase and superimposed, maximizing energy, which is then absorbed by the absorbing screen at that point. Within the transparent band, the equivalent circuits of both the transparent and absorbing screens are similar to a parallel LC resonant circuit because the structure is an open circuit for electromagnetic waves and does not absorb them; that is, electromagnetic waves can pass smoothly through the ATA metamaterial. This type of ATA metamaterial has a narrow transmission bandwidth and is limited by a quarter-wavelength air gap, making it difficult to achieve ultra-thin, low-profile, and conformal designs. Therefore, it cannot meet the practical engineering application requirements of irregularly shaped radomes with broadband electromagnetic transparency and out-of-band electromagnetic stealth. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a dual-polarized ultrathin ATA electromagnetic metamaterial with an ultra-low profile and ultra-wide passband, as well as an radome and antenna system, which have both absorption and transmission bands.

[0004] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0005] According to one aspect of the present invention, a dual-polarized ultrathin ATA electromagnetic metamaterial is provided. The dual-polarized ultrathin ATA electromagnetic metamaterial is virtually divided into multiple periodically arranged square unit structures. Each square unit structure includes two identical dielectric substrates with parallel and facing air gaps. Bright-mode resonator units are respectively provided on one surface of the dielectric substrates along the x and y directions. Each bright-mode resonator unit includes a high-frequency electric dipole on the inner side and a low-frequency electric dipole on the outer side. Dark-mode resonator units are respectively provided on the other surface along the x and y directions. Each dark-mode resonator unit includes a high-frequency comb coil and a low-frequency comb coil corresponding to the high-frequency electric dipole and the low-frequency electric dipole, respectively. The resonator distribution on the two dielectric substrates is consistent along any of the x, y, and z directions.

[0006] In one embodiment, on the dielectric substrate, the bright-mode resonator unit and the dark-mode resonator unit along the x-direction are symmetrically distributed with respect to the diagonal of the square unit structure, respectively.

[0007] In one embodiment, on the dielectric substrate, the high-frequency electric dipole is composed of two high-frequency bright-mode oscillators spaced apart, and the low-frequency electric dipole is composed of two low-frequency bright-mode oscillators spaced apart.

[0008] In one embodiment, both the high-frequency bright mode oscillator and the low-frequency bright mode oscillator are designed as rectangles. The length of the rectangular low-frequency bright mode oscillator is 2.5–3.5 mm, the width is 0.3–1.5 mm, and the interval between two adjacent low-frequency bright mode oscillators along the length direction is 0.2–1 mm. The length of the rectangular high-frequency bright mode oscillator is 1–3 mm, the width is 0.2–1 mm, and the interval between two adjacent high-frequency bright mode oscillators along the length direction is 0.2–0.5 mm.

[0009] In one embodiment, on the dielectric substrate, the high-frequency comb coil includes a convex outer peripheral coil and an internal comb structure distributed on the longest straight side of the outer peripheral coil. The longest straight side is parallel to the side length of the square unit structure. The outer peripheral coil protrudes towards the center of the square unit structure. At the diagonal, the opposite side of the longest straight side of the high-frequency comb coil in the x-direction is connected to the opposite side of the longest straight side of the high-frequency comb coil in the y-direction through a microstrip line. The longest straight side of the high-frequency comb coil in the y-direction is connected to the longest straight side of the high-frequency comb coil in the y-direction through a lumped resistor. The low-frequency end comb coil has the same shape as the high-frequency end comb coil. The outer peripheral coil of the low-frequency end comb coil protrudes away from the center of the square unit structure. At the diagonal, the opposite side of the longest straight side of the low-frequency end comb coil in the x direction and the opposite side of the longest straight side of the low-frequency end comb coil in the y direction are connected by a microstrip line. The longest straight side of the low-frequency end comb coil in the x direction and the longest straight side of the low-frequency end comb coil in the y direction are connected by a lumped resistor. Furthermore, a lumped resistor is connected between the internal comb structure of the low-frequency end comb coil and the longest straight side of the low-frequency end comb coil.

[0010] In one embodiment, the length of the longest straight side of the low-frequency comb coil is 7-8 mm, and the width from the longest straight side of the low-frequency comb coil to its opposite side is 0.5-1.5 mm; the length of the longest straight side of the high-frequency comb coil is 4-6 mm, and the width from the longest straight side of the high-frequency comb coil to its opposite side is 0.5-1.2 mm.

[0011] In one embodiment, the low-frequency comb coil includes three spaced-apart internal comb structures, each internal comb structure being perpendicular to the longest straight edge of the low-frequency comb coil, and having a length of 0.3–0.8 mm and a width of 0.2–1 mm; the high-frequency comb coil includes three spaced-apart internal comb structures, each internal comb structure being perpendicular to the longest straight edge of the high-frequency comb coil, and having a length of 0.3–0.8 mm and a width of 0.2–0.5 mm.

[0012] In one embodiment, the square structural unit has a side length of 8-12 mm, the dielectric constant of the dielectric substrate is 2.2-4, the loss angle is 0.001-0.03, and the thickness is 0.5-2 mm. The bright-mode resonator and the dark-mode resonator on the surface of the dielectric substrate are designed as gold / silver / copper foil with a thickness between 0.017-0.035 mm.

[0013] According to another aspect of the present invention, an antenna radome is provided, comprising the dual-polarized ultrathin ATA electromagnetic metamaterial as described above.

[0014] According to another aspect of the present invention, an antenna system is provided, including an antenna and an antenna radome as described above, the antenna radome being disposed on the antenna.

[0015] Unlike the mainstream wave absorption and transmission principles mentioned in the background art, the dual-polarized ultrathin ATA electromagnetic metamaterial of this invention is designed based on the principle of electromagnetically induced absorption (EIA). This principle is an innovation of electromagnetically induced transparency (EIT) technology, which originates from quantum physics and is a technique for eliminating the influence on electromagnetic waves as they propagate in a medium.

[0016] This invention designs metamaterial structural units based on the principle of electromagnetic induction and wave absorption, and proposes a novel dual-polarized ultrathin ATA electromagnetic metamaterial. The bright-mode resonator on it is an electric dipole excitation mode that can be directly excited by the incident wave, and the dark-mode resonator is formed by the electromagnetic coupling between the bright-mode resonator and the dark-mode resonator. Electromagnetic energy is absorbed by loading a resistor on the dark-mode resonant structure. Within the 14.6 GHz to 18.2 GHz frequency band, an ultra-wide passband with an absolute bandwidth of 3.6 GHz and a relative bandwidth of 21.9% is achieved. Simultaneously, two absorbing bands with nearly 1 GHz bandwidth appear from 13.2 GHz to 14 GHz and from 18.7 GHz to 19.4 GHz, respectively. This material possesses both absorbing and transmitting bands, with the relative bandwidth of the transmitting band reaching 21.9%, generally superior to other ATA electromagnetic metamaterials. Furthermore, the metamaterial can be designed with a thickness as low as 3 mm, classifying it as an ultra-thin ATA metamaterial. It is a conformally conformal absorbing-transmitting-absorbing metamaterial with an ultra-low profile and ultra-wide passband, providing a new technological approach for realizing irregularly shaped radomes for radar and communication systems with broadband electromagnetic transparency and out-of-band stealth. Correspondingly, radomes and antenna systems fabricated using this dual-polarized ultra-thin ATA electromagnetic metamaterial can achieve broadband electromagnetic transparency and out-of-band absorption electromagnetic characteristics.

[0017] Other advantages of the present invention will be described in detail in the following detailed description section with reference to the accompanying drawings. Attached Figure Description

[0018] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0019] In the attached diagram:

[0020] Figure 1 This is a side view of a square unit structure according to an embodiment of a dual-polarized ultrathin ATA electromagnetic metamaterial of the present invention.

[0021] Figure 2 This diagram shows a square-cell dielectric substrate, a bright-mode resonator, and a dark-mode resonator. The specific arrangement of the lumped resistors on the dark-mode resonator is omitted in this diagram; for details on the specific arrangement of the lumped resistors in the dark-mode resonator, please refer to [link to diagram]. Figure 4 ;

[0022] Figure 3 This is a top view of a bright-mode resonator, where the boundary of the dielectric substrate is represented by dashed lines;

[0023] Figure 4 This is a top view of a dark-mode resonator, where the boundary of the dielectric substrate is represented by dashed lines;

[0024] Figure 5 Transmission / reflection characteristics of a single square unit structure when the spacing between one dielectric substrate and another dielectric substrate is 2 mm.

[0025] Figure 6 The transmission / reflection characteristics of a single square unit structure when the distance between one dielectric substrate and another dielectric substrate is 3 mm.

[0026] Figure reference numerals: 10 dielectric substrate, 101 bright-mode resonator, 1011 low-frequency bright-mode oscillator, 1012 low-frequency bright-mode oscillator, 1013 low-frequency bright-mode oscillator, 1014 low-frequency bright-mode oscillator, 1015 high-frequency bright-mode oscillator, 1016 high-frequency bright-mode oscillator, 1017 high-frequency bright-mode oscillator, 1018 high-frequency bright-mode oscillator, 102 dark-mode resonator, 1021 high-frequency comb coil, 10 211 Internal comb structure, 1022 High-frequency end comb coil, 10221 Internal comb structure, 1023 Low-frequency end comb coil, 10231 Internal comb structure, 1024 Low-frequency end comb coil, 10241 Internal comb structure, 1031 Lumped resistor, 1032 Lumped resistor, 1033 Lumped resistor, 1034 Lumped resistor, 20 Dielectric substrate, 201 Bright mode resonator, 202 Dark mode resonator. Detailed Implementation

[0027] To further explain the technical solution of the present invention, the present invention will be described in detail below with reference to the accompanying drawings, in which the same reference numerals denote the same parts.

[0028] See also Figures 1-4 The dual-polarized ultrathin ATA electromagnetic metamaterial is virtually divided into multiple periodically arranged square unit structures. In this embodiment, the square unit structure includes a dielectric substrate 10 and a dielectric substrate 20 made of non-conductive material with parallel and opposite air-insulating layers and identical dimensions and structure. The resonators on the surfaces of dielectric substrate 10 and dielectric substrate 20 are uniformly distributed along any x, y, or z direction. The two-dimensional planar dimensions of the square unit structure are 10mm*10mm. The following description uses dielectric substrate 10 as an example.

[0029] In this embodiment, there is a 2mm air gap between the dielectric substrate 10 and the dielectric substrate 20. The thickness of the dielectric substrate 10 is 1mm. A bright-mode resonator 101 is etched on the upper surface of the dielectric substrate 10, and a dark-mode resonator 102 is etched on the lower surface. In this embodiment, the thickness of the dielectric substrate is optimized by comprehensively considering factors such as absorption / transmission characteristics, the total weight of the entire structure, and the total cross-sectional height. The 2mm air gap is an optimized value based on the transmission and absorption performance indicators. In different embodiments, the air gap between the two dielectric substrates can be adjusted according to the transmission and absorption performance indicators.

[0030] like Figures 2-4 As shown, on the upper surface of the dielectric substrate 10, along the y-direction, high-frequency electric dipoles and low-frequency electric dipoles are etched. The low-frequency electric dipoles are composed of low-frequency bright mode oscillators 1011 and 1012 spaced apart. The high-frequency electric dipoles are composed of high-frequency bright mode oscillators 1015 and 1016 spaced apart. The high-frequency bright mode oscillators 1015 and 1016 are located on the inner side, while the low-frequency bright mode oscillators 1011 and 1012 are located on the outer side. By arranging the relatively larger low-frequency bright mode oscillators 1011 and 1012 on the outer side and the relatively smaller high-frequency bright mode oscillators 1015 and 1016 on the outer side, the situation where the metal coils in the x and y directions are prone to short circuits can be avoided. Similarly, along the x-direction, the dielectric substrate 10 is etched with low-frequency bright mode oscillators 1013, 1014, 1017, and 1018 at corresponding positions. The low-frequency bright mode oscillators 1011, 1012, 1013, and 1014 have the same shape and size, as do the high-frequency bright mode oscillators 1015, 1016, 1017, and 1018. The low-frequency bright mode oscillators 1011 and 1012 and the high-frequency bright mode oscillators 1015 and 1016 correspond to polarization in the y-direction, while the low-frequency bright mode oscillators 1013 and 1014 and the high-frequency bright mode oscillators 1017 and 1018 correspond to polarization in the x-direction. These eight bright mode oscillators are metal microstrip bright mode oscillators.

[0031] On the lower surface of the dielectric substrate 10, a low-frequency comb coil 1021, a high-frequency comb coil 1023, a low-frequency comb coil 1022, and a high-frequency comb coil 1024 are etched along the x and y directions, respectively. The low-frequency comb coil 1021 and the low-frequency comb coil 1022 have the same shape and size and are directly connected by a metal microstrip line. The high-frequency comb coil 1023 and the high-frequency comb coil 1024 have the same shape and size and are directly connected by a metal microstrip line.

[0032] On the dielectric substrate 10, the low-frequency end comb coil 1021 is approximately aligned with the low-frequency end electric dipole formed by the low-frequency end bright mode oscillator 1011 and the low-frequency end bright mode oscillator 1012, and the high-frequency end comb coil 1023 is approximately aligned with the high-frequency end electric dipole formed by the high-frequency end bright mode oscillator 1015 and the high-frequency end bright mode oscillator 1016. Furthermore, on the dielectric substrate 10, the low-frequency bright mode oscillator 1011, low-frequency bright mode oscillator 1012, high-frequency bright mode oscillator 1015, high-frequency bright mode oscillator 1016, low-frequency comb coil 1021, and high-frequency comb coil 1023 in the y-direction are symmetrically distributed with respect to the diagonal of the square unit structure with respect to the low-frequency bright mode oscillator 1013, low-frequency bright mode oscillator 1014, high-frequency bright mode oscillator 1018, high-frequency bright mode oscillator 1017, low-frequency comb coil 1022, and high-frequency comb coil 1024 in the x-direction.

[0033] Specifically, the low-frequency bright mode oscillators 1011, 1012, 1013, and 1014 and the high-frequency bright mode oscillators 1015, 1016, 1017, and 1018 are all rectangular. The low-frequency bright mode oscillators 1011, 1012, 1013, and 1014 have a length of 3 mm and a width of 0.9 mm, with a spacing of 0.5 mm between two adjacent low-frequency bright mode oscillators. The high-frequency bright mode oscillators 1015, 1016, 1017, and 1018 have a length of 2 mm and a width of 0.4 mm, with a spacing of 0.5 mm between two adjacent high-frequency bright mode oscillators.

[0034] like Figure 2 and Figure 4As shown, on the dielectric substrate 10, the low-frequency comb coil 1021 and low-frequency comb coil 1022 have the same shape and size, and the high-frequency comb coil 1023 and high-frequency comb coil 1024 have the same shape and size. Taking the high-frequency comb coil 1023 as an example, the high-frequency comb coil 1023 includes a convex outer peripheral coil and an inner comb structure 10231 distributed on the longest straight side of the outer peripheral coil. Its longest straight side is parallel to the side length of the square unit structure. The outer peripheral coil protrudes towards the center of the square unit structure. When the longest straight side extends to the diagonal of the square unit structure, it does not connect with the opposite side. At the diagonal of the square unit structure, the opposite side of the longest straight side of the high-frequency comb coil 1023 in the y-direction is connected to the opposite side of the longest straight side of the high-frequency comb coil 1024 in the x-direction through a metal microstrip line. The longest straight side of the high-frequency comb coil 1023 in the y-direction is connected to the longest straight side of the high-frequency comb coil 1024 in the x-direction through a metal microstrip line. The total resistance is 1034 connected; the shape of the low-frequency comb coil 1021 is the same as that of the high-frequency comb coil 1023. The outer circumference of the low-frequency comb coil 1021 protrudes away from the center of the square unit structure. At the diagonal of the square unit structure, the opposite side of the longest straight side of the low-frequency comb coil 1021 in the y-direction is connected to the opposite side of the longest straight side of the low-frequency comb coil 1022 in the x-direction through a microstrip line. The longest straight edge of the low-frequency end comb coil 1022 in the x-direction is connected to the longest straight edge of the low-frequency end comb coil 1021 through a lumped resistor 1031. Furthermore, a lumped resistor 1032 connects the internal comb structure 10211 of the low-frequency end comb coil 1021 in the y-direction to the longest straight edge of the low-frequency end comb coil 1021, and a lumped resistor 1033 connects the internal comb structure 10221 of the low-frequency end comb coil 1022 in the x-direction to the longest straight edge of the low-frequency end comb coil 1022. In the dark-mode resonator 102, the lumped resistors are placed according to the principles of maximizing absorption efficiency, minimizing the number of resistors, and reducing cost.

[0035] Specifically, the longest straight side of the low-frequency comb coil 1021 is 8mm, and the width from the longest straight side of the low-frequency comb coil 1021 to its opposite side is 1mm. The internal comb structure 10211 in the low-frequency comb coil 1021 is optimized to have three internal comb structures 10211, which are spaced apart. The internal comb structure 10211 is perpendicular to the longest straight side of the low-frequency comb coil 1021, and the length of the internal comb structure 10211 is 0.6mm and the width is 0.5mm. The longest straight side of the high-frequency comb coil 1023 is 6mm, and the width from the longest straight side of the high-frequency comb coil 1023 to its opposite side is 0.8mm. The internal comb structure 10231 in the high-frequency comb coil 1023 is optimized to be three, and the three internal comb structures 10231 are distributed at intervals. The internal comb structure 10231 is perpendicular to the longest straight side of the high-frequency comb coil 1023, and the length of the internal comb structure 10231 is 0.5mm and the width is 0.2mm.

[0036] In this embodiment, the dielectric constant of the dielectric substrate 10 is 2.8, the loss angle is 0.015, and the bright mode resonator 101 and dark mode resonator 102 on the surface of the dielectric substrate 10 are designed as gold foil with a thickness of 0.025 mm.

[0037] In other embodiments, the bright-mode resonator 101 and dark-mode resonator 102 on the surface of the dielectric substrate 10 may also be silver / copper foil with a thickness between 0.017 and 0.035 mm.

[0038] Figure 5 When the spacing between dielectric substrate 10 and dielectric substrate 20 in a single square unit structure is 2 mm, the transmission / reflection characteristics of this square unit structure are as follows: Figure 5 As can be seen, when the air gap is 2mm, the transmission passband (S) 11 ≤-10dB and S 21 ≥-3dB) ranges from 14.6GHz to 18.2GHz, with an absolute bandwidth of 3.6GHz and a relative bandwidth of 21.9%; absorbing band (S 11 ≤-10dB and S 21 ≤-10dB) are from 13.2GHz to 14GHz and from 18.7GHz to 19.4GHz, respectively. Figure 6 When the spacing between dielectric substrate 10 and dielectric substrate 20 in a single square unit structure is 3 mm, the transmission / reflection characteristics of this square unit structure are as follows: Figure 6As can be seen, when the air gap is 3mm, the transmission passband is from 14.9GHz to 17.9GHz, the absolute bandwidth is 3GHz, and the relative bandwidth is 18.2%. The absorption bands are from 12.5GHz to 13.9GHz and from 18.8GHz to 19.5GHz, respectively. Based on this, a 2mm air gap is taken as the optimal value.

[0039] The dual-polarized ultrathin ATA electromagnetic metamaterial proposed in this invention has a bright-mode resonator that is an electric dipole excitation mode that can be directly excited by the incident wave, and a dark-mode resonator formed by electromagnetic coupling between the bright-mode resonator and the dark-mode resonator. Electromagnetic energy is absorbed by loading a resistor on the dark-mode resonator structure. Within the 14.6 GHz to 18.2 GHz frequency band, an ultra-wide passband with an absolute bandwidth of 3.6 GHz and a relative bandwidth of 21.9% is achieved. Simultaneously, two absorbing bands with nearly 1 GHz bandwidth appear from 13.2 GHz to 14 GHz and from 18.7 GHz to 19.4 GHz, respectively. This material possesses both absorbing and transmitting bands, with the relative bandwidth of the transmitting band reaching 21.9%, generally superior to other ATA electromagnetic metamaterials. Furthermore, the metamaterial can be designed with a thickness as low as 3 mm, classifying it as an ultra-thin ATA metamaterial. It is a conformally conformal absorbing-transmitting-absorbing metamaterial with an ultra-low profile and ultra-wide passband, providing a new technological approach for realizing irregularly shaped radomes for radar and communication systems with broadband electromagnetic transparency and out-of-band stealth. Correspondingly, radomes and antenna systems fabricated using this dual-polarized ultra-thin ATA electromagnetic metamaterial can achieve broadband electromagnetic transparency and out-of-band absorption electromagnetic characteristics.

[0040] The above description is merely a specific embodiment of the present invention. It should be noted that any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the protection scope of the present invention.

Claims

1. A dual-polarized ultrathin ATA electromagnetic metamaterial, characterized in that, The dual-polarized ultrathin ATA electromagnetic metamaterial is virtually divided into multiple periodically arranged square unit structures. Each square unit structure includes two identical dielectric substrates with parallel and facing air gaps. Bright-mode resonator units are provided on one surface of the dielectric substrates along the x and y directions, respectively. Each bright-mode resonator unit includes a high-frequency electric dipole on the inner side and a low-frequency electric dipole on the outer side. Dark-mode resonator units are provided on the other surface along the x and y directions, respectively. Each dark-mode resonator unit includes a high-frequency comb coil and a low-frequency comb coil corresponding to the high-frequency electric dipole and the low-frequency electric dipole, respectively. The resonator distribution on the two dielectric substrates is consistent along any of the x, y, and z directions. On the dielectric substrate, the high-frequency comb coil includes a convex outer peripheral coil and an internal comb structure distributed on the longest straight side of the outer peripheral coil. The longest straight side is parallel to the side length of the square unit structure. The outer peripheral coil protrudes towards the center of the square unit structure. At the diagonal of the square unit structure, the opposite side of the longest straight side of the high-frequency comb coil in the x direction and the opposite side of the longest straight side of the high-frequency comb coil in the y direction are connected by a microstrip line. The longest straight side of the high-frequency comb coil in the y direction and the longest straight side of the high-frequency comb coil in the y direction are connected by a lumped resistor. The low-frequency end comb coil has the same shape as the high-frequency end comb coil. The outer peripheral coil of the low-frequency end comb coil protrudes away from the center of the square unit structure. At the diagonal, the opposite side of the longest straight side of the low-frequency end comb coil in the x direction and the opposite side of the longest straight side of the low-frequency end comb coil in the y direction are connected by a microstrip line. The longest straight side of the low-frequency end comb coil in the x direction and the longest straight side of the low-frequency end comb coil in the y direction are connected by a lumped resistor. Furthermore, a lumped resistor is connected between the internal comb structure of the low-frequency end comb coil and the longest straight side of the low-frequency end comb coil.

2. The dual-polarized ultrathin ATA electromagnetic metamaterial as described in claim 1, characterized in that, On the dielectric substrate, the bright-mode resonator unit and the dark-mode resonator unit along the x-direction are symmetrically distributed with respect to the diagonal of the square unit structure, respectively, with respect to the bright-mode resonator unit and the dark-mode resonator unit along the y-direction.

3. The dual-polarized ultrathin ATA electromagnetic metamaterial as described in claim 1, characterized in that, On the dielectric substrate, the high-frequency electric dipole is composed of two high-frequency bright-mode oscillators spaced apart, and the low-frequency electric dipole is composed of two low-frequency bright-mode oscillators spaced apart.

4. The dual-polarized ultrathin ATA electromagnetic metamaterial as described in claim 3, characterized in that, Both the high-frequency bright mode oscillator and the low-frequency bright mode oscillator are designed as rectangles. The length of the rectangular low-frequency bright mode oscillator is 2.5~3.5mm, the width is 0.3~1.5mm, and the interval between two adjacent low-frequency bright mode oscillators along the length direction is 0.2~1mm. The length of the rectangular high-frequency bright mode oscillator is 1~3mm, the width is 0.2~1mm, and the interval between two adjacent high-frequency bright mode oscillators along the length direction is 0.2~0.5mm.

5. The dual-polarized ultrathin ATA electromagnetic metamaterial as described in claim 1, characterized in that, The longest straight side of the low-frequency comb coil has a length of 7-8 mm, and the width from the longest straight side of the low-frequency comb coil to its opposite side is 0.5-1.5 mm; the longest straight side of the high-frequency comb coil has a length of 4-6 mm, and the width from the longest straight side of the high-frequency comb coil to its opposite side is 0.5-1.2 mm.

6. The dual-polarized ultrathin ATA electromagnetic metamaterial as described in claim 5, characterized in that, The low-frequency end comb coil includes three spaced-apart internal comb structures, each internal comb structure being perpendicular to the longest straight edge of the low-frequency end comb coil, and the length of the internal comb structure is 0.3~0.8mm and the width is 0.2~1mm; the high-frequency end comb coil includes three spaced-apart internal comb structures, each internal comb structure being perpendicular to the longest straight edge of the high-frequency end comb coil, and the length of the internal comb structure is 0.3~0.8mm and the width is 0.2~0.5mm.

7. The dual-polarized ultrathin ATA electromagnetic metamaterial as described in any one of claims 1-6, characterized in that, The square unit structure has a side length of 8~12mm, the dielectric constant of the dielectric substrate is 2.2~4, the loss angle is 0.001~0.03, and the thickness is 0.5~2mm. The bright mode resonator and the dark mode resonator on the surface of the dielectric substrate are designed as gold foil / silver foil / copper foil with a thickness between 0.017~0.035mm.

8. An antenna radome, characterized in that, Including the dual-polarized ultrathin ATA electromagnetic metamaterial as described in any one of claims 1-7.

9. An antenna system, characterized in that, It includes an antenna and a radome as described in claim 8, the radome being disposed on the antenna.

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