Metasurface structure and method for adjusting metasurface structure array

Abstract

The application discloses a metasurface structure and a metasurface structure array adjusting method, and the metasurface structure comprises a board layer structure, a feed antenna, a plurality of subarrays and a reflection structure. The board layer structure comprises at least one dielectric substrate and a ground plate, the feed antenna is arranged on the board layer structure, the subarrays are arranged on the board layer structure, the plurality of subarrays are arranged in an array around the feed antenna, each subarray is composed of at least one subantenna, and the reflection structure is arranged at intervals from the board layer structure. In the subarrays, the first subarray and the second subarray are arranged at intervals in a direction away from the feed antenna, and the rotation angle of the subantenna in the first subarray is different from the rotation angle of the subantenna in the second subarray. According to the application, the subarrays composed of the subantennas with different rotation angles are arranged at intervals on the board layer structure, the reflection phase is disordered, the reflected waves are offset, and the common polarization in-band low scattering characteristic of the metasurface structure is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of antennas, in particular to a metasurface structure and a metasurface structure array adjustment method. BACKGROUND

[0002] With the development of wireless communication technology, not only is it required that an antenna has high gain, but also it is required that the antenna has low scattering characteristics, which can reduce interference to other electromagnetic devices and reduce the probability of being detected, and which can realize the anti-interference ability of a communication device, but it is difficult to realize this performance. Low height is conducive to the integration and miniaturization of a system, and therefore a high-gain antenna with low scattering characteristics needs to be designed, which has very important theoretical and engineering significance.

[0003] Currently, the main design ideas for designing a low-scattering transmission array are as follows: 1. An absorber is added to the antenna to absorb non-radiation polarized electromagnetic waves or electromagnetic waves out of the band, and 2. A layer of structure is added outside the structure itself to realize phase confusion of non-radiation electromagnetic waves and thus reduce the scattering characteristics, but these methods are difficult to realize low scattering performance of in-band co-polarization.

[0004] The above content is only used to assist in understanding the technical solutions of the present application and does not represent the acknowledgement of the above content as prior art. SUMMARY

[0005] The main purpose of the present application is to provide a metasurface structure and a metasurface structure array adjustment method, which aims to solve the technical problem that the antenna in the prior art cannot effectively realize low scattering performance of in-band co-polarization.

[0006] To achieve the above purpose, the present application provides a metasurface structure, which comprises:

[0007] A plate layer structure, which comprises at least one dielectric substrate and a ground plate;

[0008] A feed source antenna, which is arranged on the plate layer structure;

[0009] A reflection structure, which is arranged at intervals with the plate layer structure;

[0010] A plurality of subarrays, which are arranged on the plate layer structure, are arranged in an array around the feed source antenna, and are composed of at least one subantenna;

[0011] The subarray comprises a first subarray and a second subarray, the first subarray and the second subarray are arranged in a staggered manner in a direction away from the feed source antenna, and the rotation angle of the subantenna in the first subarray is different from the rotation angle of the subantenna in the second subarray.

[0012] Optionally, the sub-antenna comprises:

[0013] a first circularly polarized antenna and a second circularly polarized antenna, the first circularly polarized antenna and the second circularly polarized antenna are respectively arranged on two sides of the board layer structure;

[0014] a metal column, the floor is provided with a through hole corresponding to the position of each sub-antenna, and the metal column is connected with the first circularly polarized antenna and the second circularly polarized antenna through the through hole.

[0015] Optionally, the first circularly polarized antenna of the sub-antenna in the first sub-array rotates around the metal column at a first angle, and the second circularly polarized antenna of the sub-antenna in the first sub-array rotates around the metal column at a second angle;

[0016] the first circularly polarized antenna of the sub-antenna in the second sub-array rotates around the metal column at a third angle, and the second circularly polarized antenna of the sub-antenna in the second sub-array rotates around the metal column at a fourth angle.

[0017] Optionally, the first circularly polarized patch is symmetrical along a first direction and a second direction, and the first direction is perpendicular to the second direction;

[0018] the second circularly polarized patch is symmetrical along a third direction and a fourth direction, and the third direction is perpendicular to the fourth direction.

[0019] Optionally, the through hole is arranged offset from the center position of the first circularly polarized antenna and the second circularly polarized antenna.

[0020] Optionally, the size of the through hole is greater than the inner diameter of the metal column.

[0021] Optionally, the dielectric substrate is provided with two layers;

[0022] The floor is clamped between the two layers of the dielectric substrate.

[0023] In addition, in order to achieve the above-mentioned purpose, the application further provides a metasurface structure array adjusting method, which is applied to the above-mentioned metasurface structure, and the metasurface structure array adjusting method comprises:

[0024] determining the distribution position of each sub-array in the metasurface structure;

[0025] determining the first sub-array and the second sub-array in the sub-array according to the distribution position, and the first angle of the first circularly polarized antenna of the sub-antenna in the first sub-array rotating around the corresponding metal column and the third angle of the first circularly polarized antenna of the sub-antenna in the second sub-array rotating around the corresponding metal column;

[0026] determining a second angle at which a second circularly polarized patch of the sub-antenna in the first sub-array rotates around the corresponding metal column according to the first angle;

[0027] determining a fourth angle at which a second circularly polarized patch of the sub-antenna in the second sub-array rotates around the corresponding metal column according to the third angle;

[0028] adjusting patch angles of the first sub-array in the metasurface structure according to the first angle and the second angle;

[0029] adjusting patch angles of the second sub-array in the metasurface structure according to the third angle and the fourth angle.

[0030] Optionally, the determining the second angle at which the second circularly polarized patch of the sub-antenna in the first sub-array rotates around the corresponding metal column according to the first angle comprises:

[0031] obtaining first coordinate information of each of the sub-antennas in the first sub-array, and first reflection paths between each of the sub-antennas in the first sub-array and the feed antenna in the metasurface structure;

[0032] determining the second angle at which the second circularly polarized patch of the sub-antenna in the first sub-array rotates around the corresponding metal column according to the first coordinate information, the first reflection paths and the first angle.

[0033] Optionally, the determining the fourth angle at which the second circularly polarized patch of the sub-antenna in the second sub-array rotates around the corresponding metal column according to the third angle comprises:

[0034] obtaining second coordinate information of each of the sub-antennas in the second sub-array, and second reflection paths between each of the sub-antennas in the second sub-array and the feed antenna;

[0035] determining the fourth angle at which the second circularly polarized patch of the sub-antenna in the second sub-array rotates around the corresponding metal column according to the second coordinate information, the second reflection paths and the third angle.

[0036] The application provides a metasurface structure, which comprises: a board layer structure comprising at least one dielectric substrate and a ground plate; a feed antenna arranged on the board layer structure; a reflecting structure arranged in a spaced manner with the board layer structure; and a plurality of subarrays arranged on the board layer structure in an arrayed manner around the feed antenna, wherein each of the subarrays is composed of at least one subantenna, and the subarrays comprise a first subarray and a second subarray arranged in a staggered manner in a direction away from the feed antenna, and the rotation angle of the subantennas in the first subarray is different from that of the subantennas in the second subarray. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present application, the drawings required in the embodiments will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0038] Figure 1 FIG. 1 is a structural schematic diagram of the metasurface structure of the present application;

[0039] Figure 2 FIG. 2 is a cross-sectional structural schematic diagram of the subantenna of the metasurface structure of the present application;

[0040] Figure 3 FIG. 3 is a three-dimensional structural schematic diagram of the subantenna of the metasurface structure of the present application;

[0041] Figure 4 FIG. 4 is a schematic diagram of the metal patch structure after perturbation in the metasurface structure of the present application;

[0042] Figure 5 FIG. 5 is a schematic diagram of the metasurface of the metasurface structure of the present application generating high-gain circularly polarized electromagnetic waves;

[0043] Figure 6 FIG. 6 is a schematic diagram of the low scattering principle when the left-handed circularly polarized electromagnetic waves are incident on the metasurface structure of the present application;

[0044] Figure 7 Low scattering principle diagram for right-handed circularly polarized electromagnetic wave incident to the super surface structure of the present application;

[0045] Figure 8 Array structure diagram of the super surface array of the super surface structure of the present application;

[0046] Figure 9 Top view of the first circularly polarized antenna of the super surface structure of the present application;

[0047] Figure 10 Phase distribution diagram of the super surface structure of the present application;

[0048] Figure 11 Test result diagram of the high gain array of the super surface structure of the present application;

[0049] Figure 12 RCS test result diagram of the super surface structure of the present application;

[0050] Figure 13 Structure diagram of the first circularly polarized antenna of the super surface structure of the present application;

[0051] Figure 14 Structure diagram of the second circularly polarized antenna of the super surface structure of the present application;

[0052] Figure 15 Flow diagram of the array adjustment method of the super surface structure of the present application.

[0053] Explanation of reference signs:

[0054] Reference Name Reference Name 1 first circularly polarized antenna 2 floor 3 second circularly polarized antenna 4 metallic post 5 dielectric substrate 6 through hole 7 reflective structure 8 feed antenna

[0055] The implementation, functional features and advantages of the present application will be further explained with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0056] It should be understood that the specific embodiments described herein are merely intended to explain the present application and are not intended to limit the present application.

[0057] The core of the present application is to provide a super surface structure and a super surface structure array adjustment method, aiming to solve the technical problem that the prior art cannot effectively realize the low scattering performance of in-band co-polarization.

[0058] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0059] Please refer to Figure 1 , Figure 1 A structural schematic diagram of a metasurface structure provided by the present application, the metasurface structure comprising:

[0060] A plate layer structure comprising at least one dielectric substrate and a ground plate;

[0061] A feed antenna passing through the plate layer structure;

[0062] A reflection structure spaced apart from the plate layer structure;

[0063] A plurality of subarrays passing through the plate layer structure, the plurality of subarrays being arrayed around the feed antenna, the subarrays each comprising at least one subantenna;

[0064] The subarrays comprise a first subarray and a second subarray, the first subarray and the second subarray being staggered in a direction away from the feed antenna, the rotation angle of the subantennas in the first subarray being different from the rotation angle of the subantennas in the second subarray.

[0065] It should be noted that the ground plate can be a metal plate. The reflection structure can be a metal reflection plate, and there is an air layer with a height of H between the reflection structure and the plate layer structure. The dielectric substrate can be a plate made of a material, for example, the dielectric substrate can be Rogers RO4003C or Rogers RO4450F, etc. The metasurface structure can be composed of a plurality of subarrays, wherein each subarray comprises at least one subantenna, and the structure of the subantenna is as shown in Figure 2 and Figure 3 The structure of the subantenna is as shown in Figure 2 Figure 3 ​As shown in FIG. 1, a stereo structure diagram of a sub antenna is shown, which can be composed of an upper metal patch (i.e., a first circularly polarized antenna), a lower metal patch (i.e., a second circularly polarized antenna), a floor, and a metal rod. The floor has a through hole, the metal rod is arranged on the floor through the through hole, the upper metal patch and the lower metal patch are respectively arranged on two sides of the floor, and two ends of the metal rod are respectively connected to the upper metal patch and the lower metal patch. Through reasonable design of the floor, matching between the two circularly polarized antennas is achieved, so that circularly polarized electromagnetic waves can be transmitted between different layers. By rotating the upper and lower metal patches, the reflection and transmission phases can be independently controlled at the same time, and electromagnetic wave regulation and control in the whole space can be realized.

[0066] It should be understood that the upper metal patch and the lower metal patch can be circularly polarized patch antennas as the radiation and receiving antennas of an AFA structure (i.e., an antenna-filter-antenna structure). The upper metal patch and the lower metal patch can be symmetrical structures along the x and y axes.

[0067] In a specific implementation, the metal patches of the upper and lower layers can be perturbed in the metal column and the central positive and negative 45 / 135 degree directions. The perturbation can be a gap, a branch, a structure larger than one right angle side, or a coupling structure, for example, as shown in Figure 4 Figure 4 A perturbed metal patch structure diagram is shown.

[0068] It should be understood that the super surface array in the embodiment is composed of a plurality of sub arrays composed of sub antennas, as shown in Figure 5 Figure 5 A high-gain circularly polarized electromagnetic wave generated by a super surface is shown. The right-handed electromagnetic wave reflected by the feed antenna is reflected by the reflection structure and then phase-regulated by the super surface array. The array is jointly regulated by adjusting the angles of the upper metal patches and the lower metal patches in each sub antenna, so that a high-gain beam is realized. The phase distribution is determined according to the beam direction. For the incident wave, the left-handed electromagnetic wave is incident on the array composed of sub antennas with different rotation angles, and a chaotic phase distribution (for example, the sub antennas with different angles can be in a chessboard phase distribution) is realized. Through phase compensation of the super surface, the low scattering characteristic of the scattered electromagnetic wave is realized, and the principle is shown in Figure 6 Figure 6 A low scattering (when the left-handed circularly polarized electromagnetic wave is incident) principle diagram is shown. For the incident wave, the right-handed electromagnetic wave is incident on the floor through two super surface structures, and the electromagnetic wave phase distribution is 2(α+β)+(2β)+Φ GND , where α is the rotation angle of the upper metal patch of the sub antenna around the metal column in the super surface structure, β is the rotation angle of the lower metal patch around the metal column, and Φ GND ​​​To reflect the phase of the floor, causing the confusion of the electromagnetic wave like position, realizing the low scattering characteristics of scattered electromagnetic wave, its principle is shown in Figure 7 Figure 7 The principle diagram of low scattering (when right-handed circularly polarized electromagnetic wave is incident), according to the phase distribution.

[0069] It should be understood that the metasurface structure includes a metasurface array, wherein the metasurface array has a plurality of subarrays, each subarray is composed of at least one subantenna, and the subarray includes a first subarray and a second subarray, the rotation angle of the upper antenna patch of the subantenna of the first subarray is different from the rotation angle of the upper antenna patch of the subantenna of the second subarray.

[0070] For example, the metasurface array can be a chessboard array structure, as shown in Figure 8 Figure 8 The array structure diagram of the metasurface array in the metasurface structure, wherein α is the angle of the upper antenna patch of the subantenna rotating around the metal column, four subantennas with α = 0° and α = 90° are respectively regarded as subarrays (i.e. the first subarray with the upper antenna patch angle α = 0° and the second subarray with the upper antenna patch angle α = 90°), and the subarrays are arranged at intervals, as shown in Figure 9 The view from above of the units with α = 0° and α = 90° is shown in Figure 6 When the left-handed circularly polarized electromagnetic wave is incident, as shown in Figure 8 The reflected waves obtain phase compensation of 0° and 180° respectively, and cancel each other out to realize low scattering performance, here the chessboard arrangement as shown in is adopted to determine the distribution angle α of the upper antenna patch of each subantenna in the metasurface array, and then the lower patch distribution angle β can be determined according to the following formula 1, wherein k0 is the wave number at the working frequency, R i is the distance from the feed source to each subantenna, here it is the path from the feed source to the metal plate (i.e. the reflection structure) and then reflected to the metasurface, x i and y i are the coordinates of each subantenna in the metasurface structure, φ i and θ i are the direction angles of the generated high-gain beam, and Φ GND is the phase compensation of the metal plate to the electromagnetic wave.

[0071]

[0072] The phase of the transmitted electromagnetic wave is α + β, and here the transmitted beam angle is taken as the top, and its phase distribution is shown in 10. When the right-handed circularly polarized wave is incident, as shown in Figure 7 ​As shown, the left-handed circularly polarized electromagnetic wave is transmitted through the metasurface, reflected by the metal plate as a right-handed circularly polarized electromagnetic wave, and then reflected by the metasurface again, and the right-handed circularly polarized electromagnetic wave is transmitted through the metasurface again. The whole process obtains twice transmission phase compensation 2 (a+β) of the metasurface, twice reflection phase Φ of the metal plate, and once transmission phase compensation (2β) of the metasurface, and the final electromagnetic wave phase is 2 (a+β)+2β+2Φ GND , so that the phase of the finally radiated right-handed electromagnetic wave is disordered, and the right-handed electromagnetic wave has low scattering characteristics. GND , so that the phase of the finally radiated right-handed electromagnetic wave is disordered, and the right-handed electromagnetic wave has low scattering characteristics.

[0073] In a specific implementation, test results of the metasurface structure of the embodiment are shown in FIGS. 11A and 11B. Figure 11 Figure 12 As shown, the high-gain array has test results as shown in FIGS. 12A and 12B. Figure 11 The high-gain beam of the right-handed electromagnetic wave is realized, and the gain reaches 22 dBic. The RCS test is shown in FIGS. 13A and 13B. Figure 12 As shown, the right-handed and left-handed electromagnetic waves near 24G in the band have a RCS reduction of 20 dB relative to the metal plate.

[0074] Further, the sub-antenna comprises:

[0075] The first circularly polarized antenna and the second circularly polarized antenna are respectively arranged on two sides of the plate layer structure.

[0076] The metal column is provided with a through hole corresponding to the position of each sub-antenna on the floor, and the metal column is connected with the first circularly polarized antenna and the second circularly polarized antenna through the through hole.

[0077] The angle of rotation of the first circularly polarized antenna of the sub-antenna in the first sub-array around the metal column is a first angle, and the angle of rotation of the second circularly polarized antenna of the sub-antenna in the first sub-array around the metal column is a second angle.

[0078] The angle of rotation of the first circularly polarized antenna of the sub-antenna in the second sub-array around the metal column is a third angle, and the angle of rotation of the second circularly polarized antenna of the sub-antenna in the second sub-array around the metal column is a fourth angle.

[0079] The first circularly polarized patch is symmetrical along a first direction and a second direction, and the first direction is perpendicular to the second direction.

[0080] The second circularly polarized patch is symmetrical along a third direction and a fourth direction, and the third direction is perpendicular to the fourth direction.

[0081] The through hole is arranged away from the center positions of the first circularly polarized antenna and the second circularly polarized antenna. ​

[0082] The medium substrate is provided with two layers;

[0083] The floor is clamped between the two medium substrates.

[0084] It should be noted that the first circularly polarized antenna and the second circularly polarized antenna can be upper and lower antenna patches in a sub-antenna, and refer to Figure 13 and Figure 14 wherein, Figure 13 is a schematic diagram of a first circularly polarized antenna structure, Figure 14 is a schematic diagram of a second circularly polarized antenna structure, wherein a is the angle of rotation of the first circularly polarized antenna around the metal column, b is the angle of rotation of the second circularly polarized antenna around the metal column, R is the antenna radius, d f is the distance between the metal column and the center of the antenna, x and y are the x-axis and y-axis directions, respectively, and w1 and w2 are the sizes of the antenna perturbation part. The above first and second directions can be the x-axis and y-axis directions on the first circularly polarized patch; the third and fourth directions can be the x-axis and y-axis directions on the second circularly polarized patch. The size of the through hole opened on the floor is greater than the inner diameter of the metal column, thereby ensuring the conduction performance.

[0085] It should be understood that the sub-antenna can include upper and lower metal patches, and by adjusting the biasing directions (x / y-axis directions) of the upper and lower metal patches, the left and right circularly polarized waves received and transmitted can be arbitrarily combined according to design requirements. By respectively adjusting the angles a and b of the upper and lower metal patches around the metal column, the phases of the reflected and transmitted waves are adjusted, and the super surface phase compensation principle is used, the transmission phase = a + b, and the reflection phase is 2a and 2b.

[0086] It should be noted that the super surface unit composed of the upper and lower two circularly polarized antennas is connected to each other, and the phases of the reflected and transmitted circularly polarized electromagnetic waves are realized by rotating the two circularly polarized patches, thereby realizing one circularly polarized as a high-gain beam and the other circularly polarized as a low-scattering characteristic. By using a feed source located below the super surface, the co-polarization / cross-polarization in-band low-scattering characteristic is realized by twice passing the electromagnetic waves through the super surface array, and the low-profile and high-gain characteristics are achieved. The design has the characteristics of high integration, simple structure, and clear principle.

[0087] In a specific implementation, the sub-antenna can adopt an antenna-filter-antenna structure, and the two circularly polarized antennas (i.e., the first circularly polarized antenna and the second circularly polarized antenna) are connected back-to-back to form a small “transmission-reception system” to receive electromagnetic waves and emit them after corresponding phase compensation. The structure design principle is as follows Figure 2 and Figure 3The two circularly polarized antenna patches are printed on the upper and lower surfaces of the metasurface respectively, and the reflection and transmission phases can be independently compensated by rotating the upper and lower patches. The circularly polarized antenna patch on the upper surface is rotated by an angle of a around the center of the metasurface, and the circularly polarized antenna patch on the lower surface is rotated by an angle of β around the center of the metasurface. According to the design idea of the method, since the metasurface can independently control the reflection and transmission phases, the high-gain folded transmission array with in-band co-polarization low scattering is realized by rotating the metasurface patch without adding additional structures.

[0088] For example, the medium plate material of the metasurface structure can use Rogers RO4003C material, the adhesive layer can use Rogers RO4450F material, the sub-antenna unit can be a frequency selective surface with a total thickness of 0.09 wavelength (center frequency), the period of the unit can be P (0.1-1 wavelength), and the specific size is (unit: millimeter): P = 6.5, W1 = 0.7, W2 = 0.29, R = 3.42, d = 0.9. Through the above sub-antenna unit, the phases of the reflected electromagnetic wave and the transmitted electromagnetic wave can be independently controlled by α (the first circularly polarized antenna angle of the sub-antenna) and β (the second circularly polarized antenna angle of the sub-antenna). The reflected electromagnetic wave has good reflection amplitude, and the transmitted electromagnetic wave has good transmission amplitude, so the amplitude and phase meet the requirements of array design. f

[0089] The metasurface structure includes: a plate layer structure, the plate layer structure includes at least one dielectric substrate and a ground plate; a feed antenna, the feed antenna is arranged on the plate layer structure; a reflection structure, the reflection structure is arranged in the plate layer structure; a plurality of sub-arrays, the sub-arrays are arranged on the plate layer structure, the plurality of sub-arrays are arranged in an array around the feed antenna, and the sub-arrays are composed of at least one sub-antenna; the sub-arrays include: a first sub-array and a second sub-array, the first sub-array and the second sub-array are staggered in a direction away from the feed antenna, and the rotation angle of the sub-antenna in the first sub-array is different from the rotation angle of the sub-antenna in the second sub-array. Since the sub-arrays composed of sub-antennas with different rotation angles are staggered on the plate layer structure, the reflection phase is chaotic, the reflected waves are offset, the co-polarization in-band low scattering characteristic of the metasurface structure is realized, when the circularly polarized wave is incident through the metasurface structure and reflected by the reflection structure, then reflected by the metasurface structure again, reflected by the reflection structure as a left-handed circularly polarized wave, and then transmitted through the metasurface, the transmission phase compensation of the metasurface structure is obtained twice in the whole process, the reflection phase compensation of the reflection structure is obtained twice, and the reflection phase compensation of the metasurface is obtained once, so that the phase of the finally radiated electromagnetic wave is chaotic, and the low scattering characteristic is realized.​

[0090] In addition, to achieve the above object, the embodiment further provides a metasurface structure array adjustment method applied to a metasurface structure, the metasurface structure array adjustment method comprising:

[0091] Step S10: determining distribution positions of each sub-array in the metasurface structure;

[0092] Step S20: determining a first sub-array and a second sub-array in the sub-array according to the distribution positions, and a first angle at which a first circularly polarized antenna of a sub-antenna in the first sub-array rotates around a corresponding metal column and a third angle at which a first circularly polarized antenna of a sub-antenna in the second sub-array rotates around a corresponding metal column;

[0093] Step S30: determining a second angle at which a second circularly polarized patch of the sub-antenna in the first sub-array rotates around the corresponding metal column according to the first angle;

[0094] Step S40: determining a fourth angle at which a second circularly polarized patch of the sub-antenna in the second sub-array rotates around the corresponding metal column according to the third angle;

[0095] Step S50: adjusting a patch angle of the first sub-array in the metasurface structure according to the first angle and the second angle;

[0096] Step S60: adjusting a patch angle of the second sub-array in the metasurface structure according to the third angle and the fourth angle.

[0097] It should be noted that the distribution positions can be distribution positions of the first sub-array and the second sub-array in the metasurface structure. The first angle can be a rotation angle of an upper antenna patch (i.e., a first circularly polarized antenna) of a sub-antenna in the first sub-array around a metal column. The second angle can be a rotation angle of a lower antenna patch (i.e., a second circularly polarized antenna) of the sub-antenna in the first sub-array around the metal column. The third angle can be a rotation angle of an upper antenna patch (i.e., a first circularly polarized antenna) of a sub-antenna in the second sub-array around a metal column. The fourth angle can be a rotation angle of a lower antenna patch (i.e., a second circularly polarized antenna) of the sub-antenna in the second sub-array around the metal column.

[0098] In a specific implementation, reference is made to Figure 8As shown in FIG. 6, where a is the angle of rotation of the upper-layer antenna patch of the sub-antenna around the metal column (i.e. a can be the first angle of rotation of the first circularly polarized antenna of the sub-antenna in the first sub-array around the corresponding metal column and the third angle of rotation of the first circularly polarized antenna of the sub-antenna in the second sub-array around the corresponding metal column), four sub-antennas with a = 0° and a = 90° are respectively regarded as sub-arrays (i.e. the upper-layer antenna patch with a = 0° is the first sub-array and the upper-layer antenna patch with a = 90° is the second sub-array), and the units with a = 0° and a = 90° are arranged at intervals. The top view of the units with a = 0° and a = 90° is shown in FIG. 7. Figure 9 As shown in FIG. 8, when a left-handed circularly polarized electromagnetic wave is incident, the reflected waves obtain phase compensation of 0° and 180° respectively, and cancel each other out to achieve low scattering performance. Here, a chessboard arrangement as shown in FIG. 9 is adopted to determine the distribution angle a of the upper-layer antenna patch of each sub-antenna in the metasurface array, and then the distribution angle b of the lower-layer patch can be determined according to the following formula 2 (i.e. b can be the second angle of rotation of the second circularly polarized patch of the sub-antenna in the first sub-array around the corresponding metal column and the fourth angle of rotation of the second circularly polarized patch of the sub-antenna in the second sub-array around the corresponding metal column). Figure 6 Figure 8 As shown in FIG. 8, when a left-handed circularly polarized electromagnetic wave is incident, the reflected waves obtain phase compensation of 0° and 180° respectively, and cancel each other out to achieve low scattering performance. Here, a chessboard arrangement as shown in FIG. 9 is adopted to determine the distribution angle a of the upper-layer antenna patch of each sub-antenna in the metasurface array, and then the distribution angle b of the lower-layer patch can be determined according to the following formula 2 (i.e. b can be the second angle of rotation of the second circularly polarized patch of the sub-antenna in the first sub-array around the corresponding metal column and the fourth angle of rotation of the second circularly polarized patch of the sub-antenna in the second sub-array around the corresponding metal column).

[0099] Further, in order to accurately determine the rotation angle of the lower-layer patch in each sub-antenna, the above step S30 and the above step S40 can include:

[0100] obtaining first coordinate information of each sub-antenna in the first sub-array and a first reflection path between each sub-antenna in the first sub-array and the feed antenna in the metasurface structure;

[0101] determining, according to the first coordinate information, the first reflection path and the first angle, a second angle of rotation of the second circularly polarized patch of the sub-antenna in the first sub-array around the corresponding metal column;

[0102] obtaining second coordinate information of each sub-antenna in the second sub-array and a second reflection path between each sub-antenna in the second sub-array and the feed antenna;

[0103] determining, according to the second coordinate information, the second reflection path and the third angle, a fourth angle of rotation of the second circularly polarized patch of the sub-antenna in the second sub-array around the corresponding metal column.

[0104] ​It should be noted that the first coordinate information can be the metasurface coordinate information of each sub-antenna in the first sub-array. The first reflection path can be the path taken by the electromagnetic wave from the feed to the metal plate and then reflected to each sub-antenna in the first sub-array. The second coordinate information can be the metasurface coordinate information of each sub-antenna in the second sub-array. The second reflection path can be the path taken by the electromagnetic wave from the feed to the metal plate and then reflected to each sub-antenna in the second sub-array.

[0105] It should be understood that the embodiment determines the distribution of the rotation angle a of the upper layer antenna patch first, and then determines the rotation angle β of the lower layer antenna patch according to a, and then determines the rotation angle of the lower layer unit according to the phase compensation of the high-gain beam, and the phase compensation formula of the high-gain beam is as follows formula 2, wherein k0 is the wave number at the working frequency, R i is the distance from the feed to each sub-antenna, which is the path taken by the electromagnetic wave from the feed to the metal plate (i.e. the reflection structure) and then reflected to the sub-antenna, x i and y i are the coordinates of each sub-antenna in the metasurface structure, φ i and θ i are the direction angles of the generated high-gain beam, Φ GND is the phase compensation of the electromagnetic wave generated by the metal plate

[0106]

[0107] The embodiment determines the distribution position of each sub-array in the metasurface structure, determines the first sub-array and the second sub-array in the sub-array according to the distribution position, and the first angle at which the first circularly polarized antenna of the sub-antenna in the first sub-array rotates around the corresponding metal column and the third angle at which the first circularly polarized antenna of the sub-antenna in the second sub-array rotates around the corresponding metal column, determines the second angle at which the second circularly polarized patch of the sub-antenna in the first sub-array rotates around the corresponding metal column according to the first angle, determines the fourth angle at which the second circularly polarized patch of the sub-antenna in the second sub-array rotates around the corresponding metal column according to the third angle, adjusts the patch angle of the first sub-array in the metasurface structure according to the first angle and the second angle, and adjusts the patch angle of the second sub-array in the metasurface structure according to the third angle and the fourth angle. Since the embodiment determines the rotation angle of the upper layer antenna patch in each sub-array, and then determines the rotation angle of the lower layer antenna patch according to the rotation angle of the upper layer antenna patch, the antenna array of the metasurface structure is adjusted, the in-band co-polarization low scattering characteristic is realized only by rotating the antenna patch rotation angle of each sub-antenna in the antenna array, and a high-gain beam is obtained.

[0108] It is also noted that, in this disclosure, relational terms such as first and second, and the like, can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0109] The above description of disclosed embodiments provides enabling concepts for making or using the application.

[0110] Many modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Accordingly, the application is not to be restricted based on the specific embodiments shown and described, as defined in the appended claims and / or as only covering teaching of such passive elements.

Claims

1. A metasurface structure, characterized in that, The metasurface structure includes: A laminated structure, the laminated structure comprising at least one dielectric substrate and a ground plane; A feed antenna, wherein the feed antenna is mounted on the plate structure; A reflective structure, wherein the reflective structure is spaced apart from the plate structure; Multiple subarrays are disposed on the plate structure and arranged in an array around the feed antenna. Each subarray consists of at least one sub-antenna. The subarray includes a first subarray and a second subarray, wherein the first subarray and the second subarray are staggered along a direction away from the feed antenna, and the rotation angle of the sub-antenna in the first subarray is different from the rotation angle of the sub-antenna in the second subarray. The sub-antenna includes: A first circularly polarized antenna and a second circularly polarized antenna are respectively disposed on both sides of the plate structure; The metal pillar has through holes at the positions of each of the sub-antennas on the floor, and the metal pillar is connected to the first circularly polarized antenna and the second circularly polarized antenna through the through holes respectively; The first circularly polarized antenna of the sub-antenna in the first sub-array rotates around the metal pillar by a first angle, and the second circularly polarized antenna of the sub-antenna in the first sub-array rotates around the metal pillar by a second angle. The first circularly polarized antenna of the sub-antenna in the second sub-array rotates around the metal pillar at a third angle, and the second circularly polarized antenna of the sub-antenna in the second sub-array rotates around the metal pillar at a fourth angle.

2. The metasurface structure as described in claim 1, characterized in that, The first circularly polarized antenna is symmetrical along a first direction and a second direction, and the first direction is perpendicular to the second direction. The second circularly polarized antenna is symmetrical along a third direction and a fourth direction, respectively, with the third direction being perpendicular to the fourth direction.

3. The metasurface structure as described in claim 1, characterized in that, The through-hole is positioned offset from the center of the first circularly polarized antenna and the second circularly polarized antenna.

4. The metasurface structure as described in claim 1, characterized in that, The size of the through hole is larger than the inner diameter of the metal column.

5. The metasurface structure as described in claim 1, characterized in that, The dielectric substrate has two layers; The floor is sandwiched between the two dielectric substrates.

6. A method for adjusting a metasurface structure array, characterized in that, The metasurface structure array adjustment method is applied to the metasurface structure according to any one of claims 1 to 5, and the metasurface structure array adjustment method includes: Determine the distribution positions of each subarray in the metasurface structure; The first subarray and the second subarray in the subarray are determined according to the distribution position, and the first angle of rotation of the first circularly polarized antenna of the sub-antenna in the first subarray around the corresponding metal pillar and the third angle of rotation of the first circularly polarized antenna of the sub-antenna in the second subarray around the corresponding metal pillar are determined. Based on the first angle, determine the second angle by which the second circularly polarized antenna of the sub-antenna in the first sub-array rotates around the corresponding metal pillar; The fourth angle of rotation of the second circularly polarized antenna of the sub-antenna in the second sub-array around the corresponding metal pillar is determined based on the third angle. The patch angles of the first sub-array in the metasurface structure are adjusted according to the first angle and the second angle; The patch angles of the second subarray in the metasurface structure are adjusted according to the third and fourth angles.

7. The method for adjusting a metasurface structure array as described in claim 6, characterized in that, Determining the second angle of rotation of the second circularly polarized antenna of the sub-antenna in the first sub-array around the corresponding metal pillar based on the first angle includes: Obtain the first coordinate information of each sub-antenna in the first sub-array, and the first reflection path between each sub-antenna in the first sub-array and the feed antenna in the metasurface structure; Based on the first coordinate information, the first reflection path, and the first angle, determine the second angle by which the second circularly polarized antenna of the sub-antenna in the first sub-array rotates around the corresponding metal pillar.

8. The method for adjusting a metasurface structure array as described in claim 6, characterized in that, The step of determining the fourth angle of rotation of the second circularly polarized antenna of the sub-antenna in the second sub-array around the corresponding metal pillar based on the third angle includes: Obtain the second coordinate information of each sub-antenna in the second sub-array, and the second reflection path between each sub-antenna in the second sub-array and the feed antenna; Based on the second coordinate information, the second reflection path, and the third angle, determine the fourth angle by which the second circularly polarized antenna of the sub-antenna in the second sub-array rotates around the corresponding metal pillar.

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