Dual-frequency polarization and modal multiplexing circular polarization vortex wave antenna design method

Abstract

The invention relates to a dual-frequency polarization and modal multiplexing circular polarization vortex wave antenna design method, which only uses a layer of dielectric substrate, has the advantages of low profile, small size, light weight and the like, can adopt a mature PCB (Printed Circuit Board) manufacturing process, greatly reduces the processing cost, and is convenient for engineering realization. Through the design of the units and the array plane, reflection in the same rotation direction is achieved, the formed array plane has the characteristics of polarization multiplexing and modal multiplexing compared with vortex waves generated by a traditional same-aperture reflective array, and the defect that spectrum resources are insufficient in traditional wireless communication is overcome. The designed antenna can generate vortex waves with different polarizations and modal numbers in different frequency bands, the beam direction and the modal number can be regulated and controlled at will, and the antenna has great application prospects in the fields of wireless communication, target detection, microwave imaging, security encryption and the like.

Description

Technical Field

[0001] The present application relates to the field of antenna design, and in particular, to a design method for a dual-frequency polarization and modal multiplexing circularly polarized vortex wave antenna. Background Art

[0002] Vortex electromagnetic waves carrying orbital angular momentum (OAM) have attracted widespread attention because they have been proven to increase channel capacity by multiplexing orthogonal modes, and have become a research hotspot in the fields of radio frequency, microwaves, and antennas. At present, in the field of radio frequency and microwaves, the application research based on vortex electromagnetic waves mainly focuses on three aspects: (1) Research on OAM-based modal multiplexing technology in the field of wireless communications, which can achieve ultra-high channel capacity while reducing multipath interference. (2) Electromagnetic waves carrying different OAM modes have rich phase wavefront structures and show great application potential in target detection and microwave imaging, especially in improving azimuth resolution. (3) The combination of OAM information encryption and polarization multiplexing will further improve the security of information transmission. However, existing vortex wave antennas have the problems of scarce wireless communication spectrum resources and insufficient channel capacity. Summary of the invention

[0003] In order to overcome at least one shortcoming in the prior art, the present application provides a design method for a dual-frequency polarization and modal multiplexing circularly polarized vortex wave antenna.

[0004] In a first aspect, a design method for a dual-frequency polarization and modal multiplexing circularly polarized vortex wave antenna is provided, comprising:

[0005] Obtaining the unit phase required for each metasurface reflection unit to generate a left-hand circularly polarized beam, and the unit phase required for each metasurface reflection unit to generate a right-hand circularly polarized beam;

[0006] Determine the rotation angle of each metasurface reflection unit to achieve geometric phase control and dynamic phase compensation of the metasurface reflection unit according to the phases of the two units;

[0007] According to the dynamic phase compensation of the metasurface reflection unit and the corresponding relationship between the dynamic phase compensation and the side length, the side length of the hexagonal frame of the metal patch in the metasurface reflection unit is determined; the metal patch includes a hexagonal frame with an opening on one side, and a hexagonal patch is arranged at the center of the hexagonal frame;

[0008] Rotate each metasurface reflection unit counterclockwise by the rotation angle;

[0009] All metasurface reflection units are arranged in a rectangular or circular periodic arrangement to form a reflection array of a rectangular aperture array or a circular aperture array. A dual circularly polarized feed source is placed in front of the reflection array in a forward feed manner, ultimately forming a dual-frequency polarization and modal multiplexing circularly polarized vortex wave antenna.

[0010] In one embodiment, the rotation angle of each metasurface reflection unit to achieve geometric phase control and the dynamic phase compensation of the metasurface reflection unit are determined according to the two unit phases, including:

[0011] Construct the following relationship:

[0012]

[0013] in, The unit phase required for each metasurface reflection unit to generate a right-hand circularly polarized beam is: The unit phase required for each metasurface reflection unit to generate a left-hand circularly polarized beam is: is the dynamic phase compensation of the metasurface reflection unit, is the rotation angle;

[0014] Solve the relationship based on the phase of the two units and get the rotation angle Dynamic phase compensation of metasurface reflective units

[0015] In one embodiment, the metasurface reflection unit includes a dielectric plate and a floor, with an air layer between the dielectric plate and the floor; a metal patch is arranged on the dielectric plate.

[0016] In one embodiment, the dual-frequency polarization and modal multiplexing circularly polarized vortex wave antenna has two operating frequency bands, namely 10.7-12.75 GHz, with a center frequency of 11.725 GHz, and 12.75-18.1 GHz, with a center frequency of 15.425 GHz.

[0017] In one embodiment, the dual circular polarization feed source is a conical horn antenna, the feeding mode is forward feeding, and the polarization mode is dual circular polarization.

[0018] In one embodiment, the focal diameter ratio of the reflect array is set to 0.866, and the vertical distance between the phase center of the dual circular polarization feed and the reflect array is set to 259.8 mm.

[0019] In a second aspect, a dual-frequency polarization and modal multiplexing circularly polarized vortex wave antenna is provided, comprising: a feed source and a plurality of metasurface reflection units, wherein the plurality of metasurface reflection units are arranged in a rectangular or circular periodic pattern to form a reflection array of a rectangular aperture array or a circular aperture array; the feed source is a dual circularly polarized feed source, and is placed in front of the reflection array in a forward feeding manner;

[0020] Each metasurface reflection unit includes a dielectric plate and a floor, with an air layer between the dielectric plate and the floor; a metal patch is arranged on the dielectric plate; the metal patch includes a hexagonal frame with an opening on one side, and a hexagonal patch is arranged at the center of the hexagonal frame.

[0021] In one embodiment, the antenna has two operating frequency bands, namely 10.7-12.75 GHz with a center frequency of 11.725 GHz, and 12.75-18.1 GHz with a center frequency of 15.425 GHz.

[0022] In one embodiment, the feed source is a conical horn antenna, the feeding mode is forward feeding, and the polarization mode is dual circular polarization.

[0023] In one embodiment, the focal diameter ratio of the reflect array is set to 0.866, and the vertical distance between the phase center of the dual circular polarization feed and the reflect array is set to 259.8 mm.

[0024] Compared with the prior art, this application has the following beneficial effects:

[0025] 1. The circularly polarized vortex wave antenna of the present application uses only one layer of dielectric substrate and has the advantages of low profile, small size, light weight, etc. It can adopt mature PCB manufacturing technology, greatly reduce processing costs, and facilitate engineering implementation.

[0026] 2. The circularly polarized vortex wave antenna of the present application realizes co-rotational reflection through the design of units and arrays. The array formed has the characteristics of polarization multiplexing and modal multiplexing compared to the vortex waves generated by the traditional same-aperture reflection array, which makes up for the shortcomings of insufficient spectrum resources in traditional wireless communications.

[0027] 3. The broadband circularly polarized vortex wave antenna of the present application has an axial ratio bandwidth that can cover the downlink and uplink frequency bands of Ku-band satellite communications, and the peak gains of the downlink and uplink operating frequency bands are 24.32 dB and 23.87 dB, respectively. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present application may be better understood by referring to the following description given in conjunction with the accompanying drawings, which together with the following detailed description are included in this specification and form a part of this specification. In the drawings:

[0029] Figure 1 A flowchart of a design method for a dual-frequency polarization and modal multiplexing circularly polarized vortex wave antenna is shown;

[0030] Figure 2 A schematic diagram showing polarization multiplexing of a metasurface reflection unit is shown;

[0031] Figure 3A schematic diagram of a metasurface reflection unit is shown, wherein (a) is a 3-D view of the metasurface reflection unit, (b) is a top view of the metasurface reflection unit, and (c) is an original position view of the metasurface reflection unit;

[0032] Figure 4 The figure shows the schematic diagram of the dynamic phase simulation results of each unit; wherein (a) is the polarization reflection amplitude, (b) is the cross-polarization reflection amplitude, and (c) is the co-polarization reflection phase;

[0033] Figure 5 A dynamic phase simulation diagram of a metasurface reflection unit without hexagonal patches is shown;

[0034] Figure 6 A schematic diagram of the geometric phase simulation results of each unit is shown; among them, (a) is the unit geometric phase simulation result at the frequency point of 10.7 GHz, (b) is the unit geometric phase simulation result at the frequency point of 15 GHz, and (c) is the unit geometric phase simulation result at the frequency point of 18.1 GHz.

[0035] Figure 7 The schematic diagram of the three-dimensional structure of the dual-frequency polarization and modal multiplexing circularly polarized vortex wave antenna is shown;

[0036] Figure 8 A top view of a dual-frequency polarization and modal multiplexing circularly polarized vortex wave antenna is shown;

[0037] Fig. 9 Schematic diagrams of the amplitude and phase distribution of the near-field electric field of the vortex wave are shown, where (a) is the phase diagram at 11.725 GHz, (b) is the amplitude diagram at 11.725 GHz, (c) is the phase diagram at 15.425 GHz, and (d) is the amplitude diagram at 15.425 GHz;

[0038] Fig.10 The far-field gain pattern of the antenna is shown, where (a) is the gain pattern of each frequency point for left-hand circular polarization input, and (b) is the gain pattern of each frequency point for right-hand circular polarization input;

[0039] Fig.11 The antenna axial ratio radiation pattern is shown, where (a) is the axial ratio radiation pattern of each frequency point for left-hand circular polarization input, and (b) is the axial ratio radiation pattern of each frequency point for right-hand circular polarization input. DETAILED DESCRIPTION

[0040] The exemplary embodiments of the present application will be described below in conjunction with the accompanying drawings. For the sake of clarity and conciseness, not all features of the actual embodiments are described in the specification. However, it should be understood that many implementation-specific decisions can be made in the process of developing any such actual embodiments in order to achieve the specific goals of the developer, and these decisions may vary from embodiment to embodiment.

[0041] It is also necessary to explain here that, in order to avoid obscuring the present application due to unnecessary details, only the device structure closely related to the scheme according to the present application is shown in the drawings, while other details that are not closely related to the present application are omitted.

[0042] It should be understood that the present application is not limited to the described implementation forms due to the following description with reference to the accompanying drawings. In this article, where feasible, the embodiments can be combined with each other, features between different embodiments can be replaced or borrowed, and one or more features can be omitted in one embodiment.

[0043] The present application provides a design method for a dual-frequency polarization and modal multiplexing circularly polarized vortex wave antenna. Figure 1 A flowchart of the design method of a dual-frequency polarization and modal multiplexing circularly polarized vortex wave antenna is shown in FIG. Figure 1 , mainly including the following steps:

[0044] Step S1, obtaining the unit phase required for each metasurface reflection unit to generate a left-hand circularly polarized beam, and the unit phase required for each metasurface reflection unit to generate a right-hand circularly polarized beam.

[0045] Step S2, determining the rotation angle of each metasurface reflection unit to achieve geometric phase control and dynamic phase compensation of the metasurface reflection unit based on the two unit phases.

[0046] Figure 2 The schematic diagram of polarization multiplexing of the metasurface reflection unit is shown. Combining dynamic phase and geometric phase control can realize independent control of beams with different polarizations. The rotation angle of geometric phase control can be achieved by rotating the unit. Then the unit phase required for each metasurface reflection unit to generate a left-hand circularly polarized beam is and the unit phase required for each metasurface reflection unit to generate a right-hand circularly polarized beam Has the opposite effect.

[0047] When the reflectance array changes linearly, the left-handed and right-handed reflected waves point in opposite directions and are symmetrical about the normal of the reflector. Dynamic phase compensation is achieved by adjusting the total length of the sides of the open hexagonal ring. If the reflectance array is composed of isotropic units, it will provide the same phase compensation for left-handed circularly polarized and right-handed circularly polarized reflected waves.

[0048] If the dynamic phase and geometric phase are combined, right-hand circular polarization (RHCP) and left-hand circular polarization (LHCP) can be adjusted independently to achieve dual circular polarization multiplexing.

[0049] Specifically, the following relationship is constructed:

[0050]

[0051] in, The unit phase required for each metasurface reflection unit to generate a right-hand circularly polarized beam is: The unit phase required for each metasurface reflection unit to generate a left-hand circularly polarized beam is: is the dynamic phase compensation of the metasurface reflection unit, is the rotation angle;

[0052] Solve the relationship based on the phase of the two units and get the rotation angle Dynamic phase compensation of metasurface reflective units

[0053] Step S3, according to the dynamic phase compensation of the metasurface reflection unit, the correspondence between the dynamic phase compensation and the side length, determine the side length of the hexagonal frame of the metal patch in the metasurface reflection unit; the metal patch includes a hexagonal frame with an opening on one side, and a hexagonal patch is arranged at the center of the hexagonal frame. Table 1 shows the correspondence between the dynamic phase compensation and the side length. It should be noted that the unit dynamic phase also changes with a gradient, but for the sake of simple description, the 360° dynamic phase is discretely represented here. Starting from 0°, a 360° dynamic phase can be obtained by increasing the gradient by 10°. Among them, 0-170° can be divided into 18 units of state 1, and 180°-350° can be divided into 18 units of state 2. The 18 units of state 1 are represented as No.1-No.18 in Table 1, and the 18 units of state 2 are represented as No.19-No.36 in Table 1. The interval between No.1-No.18 and No.19-No.36 is only a 90° unit rotation, and their unit parameters are exactly the same. Because unit rotation does not change its dynamic phase characteristics, for the sake of simplicity, in the subsequent analysis of the dynamic phase, only the characteristics of the 18 units No.1-No.18 in state 1 are analyzed.

[0054] The side length of the hexagonal frame can be obtained by looking up Table 1 according to the dynamic phase compensation (DP / °).

[0055] Figure 3 A schematic diagram of a metasurface reflection unit is shown, wherein (a) is a 3-D view of the metasurface reflection unit, (b) is a top view of the metasurface reflection unit, and (c) is an original position diagram of the metasurface reflection unit.

[0056] The side length of the hexagonal border is l = (3l 1 / 2+l 2 +l 3 )*2,l 1 l2 l 3 are the side lengths of the hexagonal borders, such as Figure 3 as shown in (b).

[0057] Table 1

[0058]

[0059] Here, the hexagonal patch can compensate for the frequency shift caused by the change in the total length of the hexagonal border. The introduction of the hexagonal patch can broaden the unit's operating bandwidth, so that the unit's -10dB cross-polarization bandwidth can cover the downlink and uplink bands of Ku-band satellite communications. Figure 4 The schematic diagram of the dynamic phase simulation results of each unit is shown, where (a) is the polarization reflection amplitude, (b) is the cross-polarization reflection amplitude, and (c) is the co-polarization reflection phase; wherein (a), (b), and (c) each include 3 figures, which are the dynamic phase characteristics of 18 units in three groups, namely No.1-No.6, No.7-No.12, and No.13-No.18, in state 1, from left to right;

[0060] Figure 5 The dynamic phase simulation diagram of the metasurface reflection unit without hexagonal patches is shown, including 3 diagrams, from left to right, the dynamic phase characteristics of 18 units in three groups, No.1-No.6, No.7-No.12, No.13-No.18 in state 1; it should be noted that Figure 5 and Figure 4 All 18 units of the system only have the hexagonal patches removed, and the other unit parameters are exactly the same as those with hexagonal patches.

[0061] Figure 6 The schematic diagram of the geometric phase simulation results of each unit is shown, where (a) is the unit geometric phase simulation result at the frequency point of 10.7GHz, (b) is the unit geometric phase simulation result at the frequency point of 15GHz, and (c) is the unit geometric phase simulation result at the frequency point of 18.1GHz. Among them, (a), (b), and (c) each include 3 figures, from left to right, they are the geometric phase simulation results of No.1, 4, 7, 10, 13, 16, No.2, 5, 8, 11, 14, 17, No.3, 6, 9, 12, 15, 18 in state 1;

[0062] according to Figure 5 It can be seen that without the hexagonal patch, the -10dB cross-polarization bandwidth of the unit is 11.7-14.5GHz (21.3%). Figure 4(b) shows that the -10 dB cross-polarization bandwidth of the unit with hexagonal patches is 10.6-18.2 GHz (52.7%). By comparison, when the hexagonal patches are used, the -10 dB cross-polarization bandwidth of the unit is expanded by 31.4%.

[0063] Step S4, rotating each metasurface reflection unit counterclockwise by the rotation angle. Here, the metasurface reflection unit is composed of Figure 3 The original position shown in (c) is rotated counterclockwise, and the rotation degree is the rotation angle obtained in step S2, thereby achieving the control of the geometric phase.

[0064] In step S5, all metasurface reflection units are arranged in a rectangular or circular periodic arrangement to form a reflection array of a rectangular aperture array or a circular aperture array, and a dual circularly polarized feed source is placed in front of the reflection array in a forward feed manner, ultimately forming a dual-frequency polarization and modal multiplexing circularly polarized vortex wave antenna. Figure 7 A schematic diagram of the three-dimensional structure of a dual-frequency polarization and modal multiplexing circularly polarized vortex wave antenna is shown. Figure 8 A top view of a dual-frequency polarization and modal multiplexing circularly polarized vortex wave antenna is shown.

[0065] Here, 1600 metasurface reflection units can be set, and the array aperture D = 300mm.

[0066] In one embodiment, see Figure 2 The metasurface reflection unit includes a dielectric plate and a floor, an air layer is between the dielectric plate and the floor; a metal patch is arranged on the dielectric plate.

[0067] Specifically, the thickness of the air layer is 1.6 mm, that is, the floor 6 is located 1.6 mm below the dielectric plate 4. The fixed parameters of the metasurface reflection unit are the side length d = 7.5 mm of the dielectric plate, the thickness h1 of the dielectric plate = 1.5 mm, and the thickness h2 of the air layer = 1.6 mm.

[0068] Furthermore, the dual-frequency polarization and modal multiplexing circularly polarized vortex wave antenna has two operating frequency bands, namely 10.7-12.75 GHz, with a center frequency of 11.725 GHz, and 12.75-18.1 GHz, with a center frequency of 15.425 GHz. These two frequency bands correspond to the downlink frequency band and uplink frequency band in the Ku-band satellite communication frequency, respectively.

[0069] Furthermore, the dual circular polarization feed source is a conical horn antenna, the feeding mode is forward feeding, and the polarization mode is dual circular polarization.

[0070] Furthermore, in order to ensure the radiation efficiency of the reflective array, the illumination level of the feed at the edge of the array needs to drop by 10-15 dB. Therefore, the focal ratio of the reflective array is set to 0.866, that is, the vertical distance between the phase center of the dual circularly polarized feed and the reflective array is set to 259.8 mm.

[0071] The embodiment of the present application also provides a dual-frequency polarization and modal multiplexing circularly polarized vortex wave antenna, comprising: a feed source and a plurality of metasurface reflection units, wherein the plurality of metasurface reflection units are arranged in a rectangular or circular periodic pattern to form a reflection array of a rectangular aperture array or a circular aperture array; the feed source is a dual circularly polarized feed source, and is placed in front of the reflection array in a forward feeding manner;

[0072] Each metasurface reflection unit includes a dielectric plate and a floor, with an air layer between the dielectric plate and the floor; a metal patch is arranged on the dielectric plate; the metal patch includes a hexagonal frame with an opening on one side, and a hexagonal patch is arranged at the center of the hexagonal frame.

[0073] Specifically, the antenna has two operating frequency bands, namely 10.7-12.75 GHz, with a center frequency of 11.725 GHz, and 12.75-18.1 GHz, with a center frequency of 15.425 GHz.

[0074] Specifically, the feed source is a conical horn antenna, the feeding mode is forward feeding, and the polarization mode is dual circular polarization.

[0075] Specifically, the focal diameter ratio of the reflect array is set to 0.866, and the vertical distance between the phase center of the dual circular polarization feed and the reflect array is set to 259.8 mm.

[0076] The specific implementation of this embodiment can be found in the embodiment part of the previous text, and its technical effect corresponds to the technical effect of the above method, which will not be repeated here.

[0077] In order to further verify the effectiveness of the method of this application, the following experiments were conducted.

[0078] In the example of the present invention, the array size is selected to be 300mm×300mm, the focal diameter ratio is 0.866, and when a left-handed circularly polarized wave is incident, a vortex wave with a mode number of -1 can be generated, and the beam pointing is θ=3°, When a right-hand circularly polarized wave is incident, a vortex wave with a mode number of +2 can be generated, and the beam pointing is θ = -5°, After determining the phase required for compensation of each unit through the above formula, the specific size and rotation angle of each unit are determined in combination with the dynamic phase and geometric phase, and modeling and simulation are performed through MATLAB combined with full-wave simulation software.

[0079] Fig. 9The diagram shows the amplitude and phase distribution of the vortex wave near-field electric field, where (a) is the 11.725 GHz phase diagram, (b) is the 11.725 GHz amplitude diagram, (c) is the 15.425 GHz phase diagram, and (d) is the 15.425 GHz amplitude diagram. The distance between the observation plane of the phase and amplitude and the array is 400 mm, and the size of the observation plane is 300×300 mm. 2 . When a left-hand circularly polarized wave is incident, the phase distribution of the electric field changes by -360° in one cycle, has one spiral arm, and exhibits the characteristic of l=-1. When a right-hand circularly polarized wave is incident, the phase distribution of the electric field changes by 720° in one cycle, has two spiral arms, and exhibits the characteristic of l=+2. The electric field amplitude has an amplitude zero point at the center, making its field intensity amplitude distribution present a "donut" shape, which is consistent with the characteristic that the energy at the center of the vortex electromagnetic wave beam is zero.

[0080] Fig.10 The far-field gain pattern of the antenna is shown, where (a) is the gain pattern of each frequency point for left-hand circular polarization input, and (b) is the gain pattern of each frequency point for right-hand circular polarization input; Fig.11 The axial ratio pattern of the antenna is shown, where (a) is the axial ratio pattern of each frequency point for left-hand circular polarization input, and (b) is the axial ratio pattern of each frequency point for right-hand circular polarization input. It can be seen from the figure that when the left-hand circular polarization wave is incident, the beam pointing is θ = 3°, There is a radiation hole in the center of the pattern, and the axial ratio near the main lobe is less than 3dB, indicating that the metasurface reflector array generates left-hand circularly polarized vortex waves in the 10.7-12.75GHz band, and can reflect in the same direction, with a peak gain of 24.32dB in the band. When the right-hand circularly polarized wave is incident, the beam pointing is θ = -5°, There is a radiation hole in the center of the radiation pattern, and the axial ratio near the main lobe is less than 3dB, indicating that the metasurface reflector array generates right-hand circularly polarized vortex waves in the frequency band of 12.75-18.1GHz, and can reflect in the same direction, with a peak gain of 23.87dB in the band.

[0081] In summary, this application proposes a broadband low-Q reflective metasurface unit with polarization conversion function, which can realize the same-handed reflection of circularly polarized waves, and can realize the independent control of two different polarization beams by combining dynamic phase and geometric phase. The array composed of this metasurface unit produces left-handed circularly polarized vortex waves in the 10.7-12.75GHz band, and the peak gain in the band is 24.32dB. Right-handed circularly polarized vortex waves are generated in the 12.75-18.1GHz band, and the peak gain in the band is 23.87dB. It has great application prospects in the field of communications, and lays a technical foundation for the practical development of vortex wave antennas with dual-frequency polarization multiplexing and modal multiplexing.

[0082] The above are only various implementations of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A design method for a dual-frequency polarization and modal multiplexing circularly polarized vortex wave antenna, characterized in that: include: Obtaining the unit phase required for each metasurface reflection unit to generate a left-hand circularly polarized beam, and the unit phase required for each metasurface reflection unit to generate a right-hand circularly polarized beam; Determine the rotation angle of each metasurface reflection unit to achieve geometric phase control and dynamic phase compensation of the metasurface reflection unit according to the phases of the two units; Determine the side length of the hexagonal frame of the metal patch in the metasurface reflection unit according to the dynamic phase compensation of the metasurface reflection unit and the correspondence between the dynamic phase compensation and the side length; the metal patch includes a hexagonal frame with an opening on one side, and a hexagonal patch is arranged at the center position of the hexagonal frame; Rotate each metasurface reflection unit counterclockwise by the rotation angle; All metasurface reflection units are arranged in a rectangular or circular periodic arrangement to form a reflection array of a rectangular aperture array or a circular aperture array. A dual circularly polarized feed source is placed in front of the reflection array in a forward feed manner, ultimately forming a dual-frequency polarization and modal multiplexing circularly polarized vortex wave antenna.

2. The method according to claim 1, characterized in that in, The rotation angle of each metasurface reflection unit to realize geometric phase control and dynamic phase compensation of the metasurface reflection unit are determined according to the phases of the two units, including: Construct the following relationship: in, The unit phase required for each metasurface reflection unit to generate a right-hand circularly polarized beam is: The unit phase required for each metasurface reflection unit to generate a left-hand circularly polarized beam is: is the dynamic phase compensation of the metasurface reflection unit, is the rotation angle; Solve the relationship according to the phase of the two units to obtain the rotation angle Dynamic phase compensation of metasurface reflective units 3. The method according to claim 1, characterized in that The metasurface reflection unit comprises a dielectric plate and a floor, an air layer is between the dielectric plate and the floor; the metal patch is arranged on the dielectric plate.

4. The method according to claim 1, characterized in that The dual-frequency polarization and modal multiplexing circularly polarized vortex wave antenna has two operating frequency bands, namely 10.7-12.75 GHz, with a center frequency of 11.725 GHz, and 12.75-18.1 GHz, with a center frequency of 15.425 GHz.

5. The method according to claim 1, characterized in that The dual circular polarization feed source is a conical horn antenna, the feeding mode is forward feeding, and the polarization mode is dual circular polarization.

6. The method according to claim 1, characterized in that The focal diameter ratio of the reflect array is set to 0.866, and the vertical distance between the phase center of the dual circular polarization feed and the reflect array is set to 259.8 mm.

7. A dual-frequency polarization and modal multiplexing circularly polarized vortex wave antenna, characterized in that: include: A feed source and a plurality of metasurface reflection units, wherein the plurality of metasurface reflection units are arranged in a rectangular or circular periodic pattern to form a reflection array of a rectangular aperture array or a circular aperture array; The feed source is a dual circular polarization feed source, which is placed in front of the reflective array in a forward feeding manner; Each metasurface reflection unit includes a dielectric plate and a floor, with an air layer between the dielectric plate and the floor; a metal patch is arranged on the dielectric plate; the metal patch includes a hexagonal frame with an opening on one side, and a hexagonal patch is arranged at the center of the hexagonal frame.

8. The antenna according to claim 7, characterized in that The antenna has two operating frequency bands, namely 10.7-12.75 GHz, with a center frequency of 11.725 GHz, and 12.75-18.1 GHz, with a center frequency of 15.425 GHz.

9. The antenna according to claim 7, characterized in that The feed source is a conical horn antenna, the feeding mode is forward feeding, and the polarization mode is dual circular polarization.

10. The antenna according to claim 7, characterized in that The focal diameter ratio of the reflect array is set to 0.866, and the vertical distance between the phase center of the dual circular polarization feed and the reflect array is set to 259.8 mm.

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