Broadband low-profile low-RCS Fabry-Perot resonant cavity antenna based on regular hexagonal periodic structure metasurface

Abstract

The present invention belongs to the technical field of microwave antennas, and discloses a low-profile broadband low-RCS Fabry-Perot resonant cavity antenna using a regular hexagonal metasurface, the antenna is composed of a Fabry-Perot resonant cavity and an artificial magnetic conductor around a partial reflection surface and a radiation patch at the upper part, the partial reflection surface and the artificial magnetic conductor are both regular hexagonal structures, the cavity height is a quarter wavelength, and the electromagnetic wave reflection phase of the artificial magnetic conductor of the upper dielectric layer is 180° different from the reflection phase of the artificial magnetic conductor of the lower dielectric layer, thereby reducing the overall RCS. The present invention combines a regular hexagonal metasurface structure with a Fabry-Perot resonant cavity antenna, improves the gain of the antenna and reduces the overall profile of the antenna, and at the same time reduces the RCS of the antenna by using the phase difference principle, the structure is compact and simple, and the design process of the same type of antenna is simplified, and the characteristics of high gain, low profile and RCS reduction make the present invention have important application prospects in airborne stealth antennas and the like.

Description

Technical Field

[0001] The present invention belongs to the technical field of microwave antennas, and in particular relates to a low-profile, broadband, low-RCS Fabry-Perot cavity antenna using a regular hexagonal metasurface. Background Art

[0002] With the development of science and technology and the rapid progress in the field of communications, people have extremely high requirements for the transmission and reception of information. Antennas, as the terminal of transmitters and the starting point of electromagnetic wave radiation in wireless communication systems, play an important role. On the other hand, in fields such as radar and satellite communications that require long-distance wireless communication, high-gain antennas have always played an important role. After introducing metasurfaces into the design of patch antennas, the research and development of antennas has made great progress.

[0003] As a special material with negative refractive index, metasurface has been widely studied because of its unique physical properties and extremely high application value. Metasurface can control electromagnetic waves by changing its shape, thereby optimizing the gain, bandwidth and other parameters of the antenna. At present, electromagnetic metasurfaces are used to improve antenna performance mainly in the following aspects: first, electromagnetic metasurface structures are loaded on the upper layer of microstrip antennas to improve antenna gain, bandwidth and other radiation characteristics; second, electromagnetic metasurface structures are introduced on the antenna surface to reduce the size of the antenna, change the polarization mode, etc. As a favorable tool, metasurfaces complement the development of antennas. The Fabry-Perot resonant cavity antenna has the characteristics of simple structure, high aperture efficiency, and simple feeding structure. Combining metasurfaces with Fabry-Perot resonant cavity antennas is not only conducive to improving antenna performance, but also may reduce the size of the antenna.

[0004] Radar cross section (RCS) indicates the strength of a target's scattering ability when exposed to radar waves. The lower the target's radar cross section, the lower the possibility of detection. Currently, there are several main technical means to achieve radar cross section, including antenna shaping or slotting, absorbing material loading, and miss cancellation.

[0005] There are many shortcomings in the existing Fabry-Perot resonant cavity antennas: 1. The profile of the existing Fabry-Perot resonant cavity antenna design is relatively high, mostly half a wavelength. 2. The gain bandwidth of the existing Fabry-Perot resonant cavity antenna is narrow. 3. The existing methods of reducing RCS of Fabry-Perot resonant cavity antennas are mostly to cancel the reflected waves on the upper surface, which is not conducive to reducing the profile of the Fabry-Perot resonant cavity antenna. How to use the smallest size to design a stable Fabry-Perot resonant cavity antenna with high gain and low RCS and a non-narrow antenna working bandwidth is the main goal of the current Fabry-Perot resonant cavity antenna design. Summary of the invention

[0006] In order to solve the above technical problems, the present invention provides a new low-profile broadband low-RCS Fabry-Perot cavity antenna using a regular hexagonal metasurface with high gain and improved antenna working bandwidth. The antenna simplifies the design of the high-gain low-profile Fabry-Perot cavity antenna, combines the RCS-reducing metasurface with the reduction of the antenna profile, and while using the regular hexagonal metasurface to reduce the Fabry-Perot cavity profile, uses the phase difference of two artificial magnetic conductors at different heights to reduce the RCS of the antenna. At the same time, the strong coupling effect of the regular hexagonal artificial magnetic conductor also improves the gain, thereby greatly increasing the availability of the Fabry-Perot cavity antenna.

[0007] In order to achieve the above object, the present invention is achieved through the following technical solutions:

[0008] The present invention discloses a broadband, low-profile, low-RCS Fabry-Perot resonant cavity antenna based on a regular hexagonal periodic structure metasurface. The broadband, low-profile, low-RCS Fabry-Perot resonant cavity antenna comprises an upper dielectric layer, a Fabry-Perot resonant cavity and a lower dielectric layer from top to bottom. The upper dielectric layer and the lower dielectric layer are arranged in a vertical direction. The upper surface of the upper dielectric layer is an upper dielectric layer artificial magnetic conductor structure arranged in a honeycomb shape. The lower surface of the upper dielectric layer is a partial reflection surface arranged in a honeycomb shape. The partial reflection surfaces are arranged in a honeycomb shape directly below the upper dielectric layer artificial magnetic conductor structure. The artificial magnetic conductor structure and the partial reflection surface are arranged in a honeycomb shape to increase the coupling between the surfaces, thereby reducing the size and enhancing the reflection performance of electromagnetic waves. The center of the upper surface of the lower dielectric layer is a rectangular radiation patch. The rectangular radiation patch is surrounded by a radiation patch rectangular opening. The upper surface of the lower dielectric layer, the radiation patch and the partial reflection surface are arranged in a honeycomb shape. The rectangular opening of the patch is surrounded by a lower dielectric layer artificial magnetic conductor structure with the same structure as the upper dielectric layer artificial magnetic conductor structure arranged in a honeycomb shape, and a lower dielectric layer artificial magnetic conductor structure with the same structure as the upper dielectric layer artificial magnetic conductor structure, and the lower surface of the lower dielectric layer is a metal grounding plate; there is a 180° phase difference between the upper dielectric layer artificial magnetic conductor structure and the lower dielectric layer artificial magnetic conductor structure, which reduces the RCS of the antenna. The broadband, low-profile, low-RCS Fabry-Perot resonant cavity antenna adopts coaxial feeding, and the coaxial feeding inner core passes through the lower dielectric layer and is connected to the rectangular radiation patch to form a feeding structure in the lower dielectric layer. The electromagnetic waves radiated by the rectangular radiation patch are repeatedly propagated in the cavity between the partial reflection surface on the lower surface of the upper dielectric layer and the upper dielectric layer artificial magnetic conductor structure, thereby enhancing the gain of the antenna, and the geometric centers of the upper and lower dielectric layer patterns are on the same straight line.

[0009] A further improvement of the present invention is that the upper dielectric layer artificial magnetic conductor structure and the lower dielectric layer artificial magnetic conductor structure include several artificial magnetic conductor units, the artificial magnetic conductor units are arranged in a honeycomb shape, the center of each artificial magnetic conductor unit is a regular hexagonal block, the regular hexagonal block is sequentially provided with a second regular hexagonal ring and a first regular hexagonal ring from the inside to the outside, and the spacing between the second regular hexagonal ring and the first regular hexagonal ring, and the spacing between the regular hexagonal block and the second regular hexagonal ring are the same.

[0010] A further improvement of the present invention is that part of the reflecting surface on the lower surface of the upper dielectric layer is a regular hexagonal block, and the gap between the regular hexagonal block and the artificial magnetic conductor structure of the upper dielectric layer, the gap between the regular hexagonal block and the artificial magnetic conductor structure of the lower dielectric layer, and the gap between the artificial magnetic conductor unit and the adjacent artificial magnetic conductor unit are all the same.

[0011] A further improvement of the present invention is that the spacing between the second regular hexagonal ring and the first regular hexagonal ring, and the spacing between the regular hexagonal block and the second regular hexagonal ring are equal. The second regular hexagonal ring and the first regular hexagonal ring are both metal patches.

[0012] A further improvement of the present invention is that a rectangular opening of the reflecting surface with a rectangular cross section is provided at the center of a part of the reflecting surface to expand the working bandwidth of the antenna, and the rectangular opening of the reflecting surface is a slot with a length of y and a width of x.

[0013] A further improvement of the present invention is that the height T of the Fabry-Perot resonant cavity is a quarter of the wavelength.

[0014] A further improvement of the present invention is that both the upper dielectric layer and the lower dielectric layer are square structures with a side length of not less than 40 mm, without any slots or corner cuts.

[0015] A further improvement of the present invention is that the artificial magnetic conductor structure of the upper dielectric layer, the artificial magnetic conductor structure of the lower dielectric layer, and the partial reflective surface of the lower surface of the upper dielectric layer are all square structures, and the side length p of the square is not less than 15 mm.

[0016] A further improvement of the present invention is that the upper dielectric layer and the lower dielectric layer are both made of Rogers RT5880 with a thickness of 4 mm and a dielectric constant of 2.2, and have the same outer contour in the top view, and the artificial magnetic conductor and the partial reflection surface are tightly attached to the dielectric layer.

[0017] The beneficial effects of the present invention are:

[0018] The present invention provides a low-profile, broadband, high-gain, low-RCS Fabry-Perot resonant cavity antenna, filling the gap in low-profile, broadband, high-gain, low-RCS Fabry-Perot resonant cavity antennas. Compared with traditional Fabry-Perot resonant cavity antennas, the resonant cavity antenna of the present invention designs the metasurface into a regular hexagonal structure and arranges it in a honeycomb pattern, which enhances the coupling between the surfaces and improves the working bandwidth of the antenna; at the same time, the cavity height of the Fabry-Perot resonant cavity antenna is reduced by adjusting the reflection phase of the metasurface of the regular hexagonal structure, which greatly reduces the profile of the antenna, and the reflected waves between the two dielectric layers are phase-cancelled to reduce the RCS of the antenna. Compared with traditional low-RCS Fabry-Perot resonant cavity antennas, this invention has a simple design, a low profile, and an effectively improved gain.

[0019] The electromagnetic waves radiated by the radiation patch of the present invention propagate repeatedly in the cavity between the partial reflection surface on the lower surface of the upper dielectric layer and the artificial magnetic conductor on the upper surface of the lower dielectric layer, thereby enhancing the gain of the antenna.

[0020] In order to meet the design requirements of enhanced gain of the Fabry-Perot cavity antenna, the cavity height and the reflection phase of the partially reflecting surface and the artificial magnetic conductor must satisfy the ray tracing theory. By designing the phase of the metasurface, the cavity height is reduced from the traditional half wavelength to a quarter wavelength, which greatly reduces the design size of the Fabry-Perot cavity antenna. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of the structure of the present invention.

[0022] Figure 2 Side view of the present invention.

[0023] Figure 3 A top view of the upper dielectric layer of the present invention.

[0024] Figure 4 Bottom view of the upper dielectric layer of the present invention.

[0025] Figure 5 A top view of the lower dielectric layer of the present invention.

[0026] Figure 6 Structural diagram of the artificial magnetic conductor unit of the present invention.

[0027] Figure 7 Structural diagram of the partially reflective surface of the present invention.

[0028] Figure 8 Schematic diagram of a low-profile, broadband, low-RCS Fabry-Perot cavity antenna S11 using a regular hexagonal metasurface in the present invention.

[0029] Fig. 9Schematic diagram of the gain of a low-profile, broadband, low-RCS Fabry-Perot cavity antenna using a regular hexagonal metasurface in the present invention.

[0030] Fig.10 RCS schematic diagram of a low-profile, broadband, low-RCS Fabry-Perot cavity antenna using a regular hexagonal metasurface in the present invention. DETAILED DESCRIPTION

[0031] The following will disclose the embodiments of the present invention with drawings. For the purpose of clear description, many practical details will be described together in the following description. However, it should be understood that these practical details should not be used to limit the present invention. That is, in some embodiments of the present invention, these practical details are not necessary. In addition, for the purpose of simplifying the drawings, some conventional structures and components will be depicted in a simple schematic manner in the drawings.

[0032] like Figure 1 As shown, the present invention is a broadband, low-profile, low-RCS Fabry-Perot resonant cavity antenna based on a regular hexagonal periodic structure metasurface. The broadband, low-profile, low-RCS Fabry-Perot resonant cavity antenna is composed of an upper dielectric layer 1, a Fabry-Perot resonant cavity and a lower dielectric layer 2 from top to bottom, and the upper dielectric layer 1 and the lower dielectric layer 2 are arranged in a vertical direction. The upper dielectric layer 1 and the lower dielectric layer 2 both use Rogers RT 5880 with a thickness of 4 mm, a dielectric constant of 2.2, and the outer contours of the top view are the same. The artificial magnetic conductor and the partial reflection surface are both tightly attached to the dielectric layer. The upper dielectric layer 1 and the lower dielectric layer 2 are both square structures with a side length of more than 40 mm, without any slots or cut corners, and the height T of the Fabry-Perot resonant cavity is a quarter wavelength, preferably, T is equal to 10 mm.

[0033] The upper surface of the lower dielectric layer 2 and the rectangular opening of the radiation patch are surrounded by a lower dielectric layer artificial magnetic conductor structure 201 with a honeycomb arrangement and having the same structure as the upper dielectric layer artificial magnetic conductor structure 101. The lower surface of the lower dielectric layer 2 is a metal ground plate GND.

[0034] like Figure 2 As shown, the upper surface of the upper dielectric layer 1 of the resonant cavity antenna of the present invention is an upper dielectric layer artificial magnetic conductor structure 101 arranged in a honeycomb shape, and the lower surface of the upper dielectric layer 1 is a partial reflection surface PRS arranged in a honeycomb shape. The partial reflection surfaces are arranged in a honeycomb shape directly below the upper dielectric layer artificial magnetic conductor structure AMC 101. The artificial magnetic conductor structure 101 and the partial reflection surfaces are arranged in a honeycomb shape to increase the coupling between the surfaces, thereby reducing the size and enhancing the reflection performance of electromagnetic waves.

[0035] There is a phase difference of 180° between the upper dielectric layer artificial magnetic conductor structure 101 and the lower dielectric layer artificial magnetic conductor structure 201, which reduces the RCS of the antenna. The broadband, low-profile, low-RCS Fabry-Perot resonant cavity antenna adopts coaxial feeding. The coaxial feeding inner core passes through the lower dielectric layer 2 and is connected to the rectangular radiation patch 202, forming a feeding structure in the lower dielectric layer 2. The electromagnetic waves radiated by the rectangular radiation patch 202 are repeatedly propagated in the cavity between the partial reflection surface on the lower surface of the upper dielectric layer 1 and the upper dielectric layer artificial magnetic conductor structure 101, thereby enhancing the gain of the antenna.

[0036] like Figure 3-4 As shown, the upper dielectric layer artificial magnetic conductor structure 101, the lower dielectric layer artificial magnetic conductor structure 201, and the partial reflection surface of the lower surface of the upper dielectric layer 1 are all square structures, and the side length of the square is p equal to 15 mm. A rectangular reflection surface opening with a rectangular cross section is provided in the center of the partial reflection surface to expand the working bandwidth of the antenna. The rectangular reflection surface opening is a slot with a length y equal to 8 mm and a width x equal to 6 mm.

[0037] like Figure 5 As shown, a rectangular radiation patch (patch antenna) 202 is provided at the center of the upper surface of the lower dielectric layer 2, the length WA of the rectangular radiation patch 202 is 11 mm, and the width LA is 6.4 mm. There is a radiation patch rectangular opening around the rectangular radiation patch 202, and the length WA1 of the radiation patch rectangular opening is 18 mm, and the width LA1 is 14 mm.

[0038] like Figure 6 As shown, the upper dielectric layer artificial magnetic conductor structure 101 and the lower dielectric layer artificial magnetic conductor structure 201 include several artificial magnetic conductor units, each of which is surrounded by six identical artificial magnetic conductor units, and the artificial magnetic conductor units are arranged in a honeycomb shape, and the center of each artificial magnetic conductor unit is a regular hexagonal block 303 with a side length of 1.1 mm. The regular hexagonal block 303 is sequentially provided with a second regular hexagonal ring 302 and a first regular hexagonal ring 301 from the inside to the outside, and the spacing 304 between the second regular hexagonal ring 302 and the first regular hexagonal ring 301 and the spacing 304 between the regular hexagonal block 303 and the second regular hexagonal ring 302 are the same. The inner side length of the second regular hexagonal ring 302 is 1.6 mm, and the outer side length is 2 mm, and the inner side length of the first regular hexagonal ring (301) is 2.6 mm, and the outer side length is 3 mm. The spacing 304 between the second regular hexagonal ring 302 and the first regular hexagonal ring 301 and the spacing 304 between the regular hexagonal block 303 and the second regular hexagonal ring 302 are both 0.5 mm. The second regular hexagonal ring 302 and the first regular hexagonal ring 301 are both metal patches.

[0039] like Figure 7 As shown, the partial reflecting surface of the lower surface of the upper dielectric layer 1 is a regular hexagonal block 306, the side length U of the regular hexagonal block 306 is 2.8 mm, the gap between the regular hexagonal block 306 and the upper dielectric layer artificial magnetic conductor structure 101, the gap between the regular hexagonal block 306 and the lower dielectric layer artificial magnetic conductor structure 201, and the gap 305 between the artificial magnetic conductor unit and the adjacent artificial magnetic conductor unit are all 3.95 mm.

[0040] Figure 8 The figure shows the S11 parameter of the Fabry-Perot resonant cavity antenna. From the figure, it can be concluded that the -10 dB bandwidth of the S11 parameter of the Fabry-Perot resonant cavity antenna is 7.8-8.8 GHZ, and the -15 dB bandwidth is 8-8.5 GHZ. Compared with the single radiation patch Fabry-Perot resonant cavity antenna, the bandwidth of the S11 parameter of this antenna has been improved.

[0041] Fig. 9 The figure shows the gain of the Fabry-Perot cavity antenna. It can be seen from the figure that the gain of the Fabry-Perot cavity antenna is improved at 4-11 GHZ and the gain of the antenna is significantly improved at 6-9 GHZ compared to the single radiating patch Fabry-Perot cavity antenna.

[0042] Fig.10 The figure shows the RCS parameters of the Fabry-Perot cavity antenna. Compared with the Fabry-Perot cavity antenna with a single radiation patch, the RCS of the Fabry-Perot cavity antenna is reduced at 6-10 GHZ and 12-23 GHZ, and the peak RCS is reduced by 15 dB.

[0043] The antenna of the present invention is composed of a Fabry-Perot resonant cavity (FPRA), a partial reflection surface (PRS) on the top, and an artificial magnetic conductor (AMC) around the radiation patch. Both the partial reflection surface and the artificial magnetic conductor adopt a regular hexagonal structure. Due to the structural characteristics of the regular hexagon, the regular hexagonal PRS and AMC can be arranged periodically in three directions, so there are six identical units around each unit. By using the regular hexagonal structure, the coupling between the units is enhanced and the reflection performance is improved. According to the ray tracing theory, the height of the Fabry-Perot resonant cavity antenna should be half a wavelength. By placing the AMC around the radiation patch and using the zero-phase reflection of the AMC, the cavity thickness can be reduced to a quarter of a wavelength to achieve a low-profile structure. Because the designed cavity height is a quarter of a wavelength, the electromagnetic wave reflection phase of the artificial magnetic conductor (AMC) of the upper dielectric layer differs by 180° from the reflection phase of the artificial magnetic conductor (AMC) of the lower dielectric layer, so the overall RCS can be reduced. The present invention combines a regular hexagonal metasurface structure with a Fabry-Perot resonant cavity antenna, thereby increasing the gain of the antenna and reducing the overall profile of the antenna. At the same time, the RCS of the antenna is reduced by using the phase difference principle. The structure is compact and simple, which simplifies the design process of antennas of the same type. The characteristics of high gain, low profile and RCS reduction make the present invention have important application prospects in airborne stealth antennas and military and other aspects.

[0044] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A broadband, low-profile, low-RCS Fabry-Perot resonant cavity antenna based on a regular hexagonal periodic structure metasurface, characterized in that: The broadband low-profile low-RCS Fabry-Perot resonant cavity antenna comprises, from top to bottom, an upper dielectric layer (1), a Fabry-Perot resonant cavity and a lower dielectric layer (2), wherein the upper dielectric layer (1) and the lower dielectric layer (2) are arranged in a vertical direction. The upper surface of the upper dielectric layer (1) is an upper dielectric layer artificial magnetic conductor structure (101) arranged in a honeycomb pattern, and the lower surface of the upper dielectric layer (1) is a partial reflection surface arranged in a honeycomb pattern. The partial reflection surface is arranged in a honeycomb pattern directly below the upper dielectric layer artificial magnetic conductor structure (101). The artificial magnetic conductor structure (101) and the partial reflection surface are arranged in a honeycomb pattern to increase coupling between the surfaces, thereby reducing the size and enhancing the reflection performance of electromagnetic waves. The center of the upper surface of the lower dielectric layer (2) is a rectangular radiation patch (202), and a radiation patch rectangular opening is arranged around the rectangular radiation patch. On the upper surface of the lower dielectric layer (2), the radiation patch rectangular opening is surrounded by a lower dielectric layer artificial magnetic conductor structure (201) with a honeycomb arrangement and having the same structure as the upper dielectric layer artificial magnetic conductor structure (101), and the lower surface of the lower dielectric layer (2) is a metal grounding plate. The upper dielectric layer artificial magnetic conductor structure (101) and the lower dielectric layer artificial magnetic conductor structure (201) have a phase difference of 180°, thereby reducing the RCS of the antenna. The broadband, low-profile, low-RCS Fabry-Perot resonant cavity antenna adopts coaxial feeding. The coaxial feeding core penetrates the lower dielectric layer (2) and is connected to the rectangular radiation patch (202), forming a feeding structure in the lower dielectric layer (2). The electromagnetic waves radiated by the rectangular radiation patch (202) are repeatedly propagated in the cavity between the partial reflection surface of the lower surface of the upper dielectric layer (1) and the lower dielectric layer artificial magnetic conductor structure (101), thereby enhancing the gain of the antenna. The upper dielectric layer artificial magnetic conductor structure (101) ) and the lower dielectric layer artificial magnetic conductor structure (201) comprise a plurality of artificial magnetic conductor units, the artificial magnetic conductor units are arranged in a honeycomb shape, the center of each artificial magnetic conductor unit is a regular hexagonal block (303), the regular hexagonal block (303) is sequentially provided with a second regular hexagonal ring (302) and a first regular hexagonal ring (301) from the inside to the outside, the spacing (304) between the second regular hexagonal ring (302) and the first regular hexagonal ring (301) and the spacing (304) between the regular hexagonal block (303) and the second regular hexagonal ring (302) are the same, and a partial reflection surface of the lower surface of the upper dielectric layer (1) comprises a regular hexagonal block (306).

2. The broadband, low-profile, low-RCS Fabry-Perot cavity antenna based on a regular hexagonal periodic structure metasurface according to claim 1, characterized in that: The first regular hexagonal ring, the second regular hexagonal ring (302), and the first regular hexagonal ring (301) are all metal patches.

3. The broadband, low-profile, low-RCS Fabry-Perot cavity antenna based on a regular hexagonal periodic structure metasurface according to claim 1, characterized in that: A rectangular reflecting opening with a rectangular cross section is provided at the center of the partial reflecting surface to expand the working bandwidth of the antenna.

4. The broadband, low-profile, low-RCS Fabry-Perot resonant cavity antenna based on a regular hexagonal periodic structure metasurface according to claim 1, characterized in that: The height T of the Fabry-Perot cavity is one quarter of the wavelength.

5. The broadband, low-profile, low-RCS Fabry-Perot cavity antenna based on a regular hexagonal periodic structure metasurface according to claim 1, characterized in that: The upper dielectric layer (1) and the lower dielectric layer (2) are both square structures with a side length of not less than 40 mm, without any slots or cut corners.

6. The broadband, low-profile, low-RCS Fabry-Perot cavity antenna based on a regular hexagonal periodic structure metasurface according to claim 1, characterized in that: The upper dielectric layer artificial magnetic conductor structure (101), the lower dielectric layer artificial magnetic conductor structure (201), and the partial reflective surface of the lower surface of the upper dielectric layer (1) are all square structures, and the side length p of the square is not less than 15 mm.

7. The broadband, low-profile, low-RCS Fabry-Perot cavity antenna based on a regular hexagonal periodic structure metasurface according to claim 1, characterized in that: The upper dielectric layer (1) and the lower dielectric layer (2) are both made of Rogers RT 5880 with a thickness of 4 mm and a dielectric constant of 2.2.

Images