Low-profile microwave focusing lens, production method thereof and reflective array antenna

Abstract

The invention relates to a low-profile microwave focusing lens which comprises a plurality of lens assemblies which are periodically arranged to form a flat-plate-shaped lens body. Each lens assembly comprises a plurality of metasurface units, and the metasurface units are sequentially arranged in a stacked mode. Each metasurface unit comprises a dielectric plate and a metal pattern layer, the metal pattern layer is arranged on the dielectric plate, the metal pattern layer comprises four curve patterns with the same structure, the four curve patterns surround the center of the dielectric plate and are distributed in an annular array, one end of each curve pattern is connected and conducted at the center of the dielectric plate, and the other end of each curve pattern is connected and conducted at the center of the dielectric plate. The shape of each curve pattern is of a sine curve structure, and the farther the sine curve structure is away from the center of the dielectric plate, the larger the amplitude is; each lens assembly has a target transmission phase with a specific numerical value according to the arrangement position of the lens assembly, and the transmission phase of the lens body is periodically changed from the center to the periphery within the range of 0-360 degrees through mutual cooperation of the lens assemblies.

Description

Technical Field

[0001] The present invention relates to the technical field of lenses, and in particular to a low-profile super-surface microwave focusing lens, a production method of the low-profile super-surface microwave focusing lens, and a reflective array antenna. Background Art

[0002] With the rapid development of fields such as wireless communications and radar, higher requirements are placed on antenna technology. The traditional Luneburg lens is spherical or cylindrical in shape, which takes up a large space and greatly limits the design of the antenna. However, in recent years, some metasurface lenses have appeared on the market, providing new ideas for antenna design. By introducing phase mutations, metasurface lenses can achieve focusing functions similar to Luneburg lenses in a single-layer structure, while having higher design flexibility. Existing single-layer metasurface lenses are difficult to achieve 360° all-round phase shift coverage, and the focusing effect is poor. Summary of the invention

[0003] The object of the present invention is to provide a low-profile microwave focusing lens, which has the advantages of reasonable design, simple structure, 360° all-round phase shift coverage, good focusing effect, etc.

[0004] The technical solution adopted by the present invention to solve the technical problem is: a low-profile microwave focusing lens, comprising a plurality of lens components, which are periodically arranged to form a flat lens body; each lens component comprises a plurality of super surface units, which are stacked in sequence; each super surface unit comprises a dielectric plate and a metal pattern layer, the metal pattern layer is arranged on the dielectric plate, the metal pattern layer comprises four curve patterns with the same structure, the four curve patterns are arranged in a ring array around the center of the dielectric plate, one end of each of the four curve patterns is connected and conducted at the center of the dielectric plate, the shape of each curve pattern is a sine curve structure, the farther the sine curve structure is from the center of the dielectric plate, the greater its amplitude is, each super surface unit changes the sine curve structure of its curve pattern, so that the transmission phase of each super surface unit can be adjusted and changed within the range of 0° to 60°; each lens component can adjust and change the transmission phase of each lens component within the range of 0° to 360° by superimposing the phases of its layers of super surface units, each lens component has a target transmission phase of a specific value according to its setting position, and the target transmission phase is based on the phase distribution formula of an ideal plane lens It can be calculated that in this formula: T targetis the target transmission phase value required by the lens assembly, λ is the wavelength of the light wave or electromagnetic wave, x and y represent the horizontal and vertical coordinates of the lens assembly in the Cartesian coordinate system of the lens body plane (the center of the lens body is the coordinate origin), and f is the focal length of the lens body (the distance from the focus to the center of the lens body); through the mutual cooperation of each lens assembly, the transmission phase of the lens body changes periodically in the range of 0° to 360° from the center to the surroundings.

[0005] Working principle of the present invention:

[0006] Since the lens body is composed of a number of lens components arranged periodically, and each lens component has a target transmission phase of a specific value according to its setting position, so as to form a stable phase gradient, the transmission phase of the lens body changes periodically from the center to the surroundings within the range of 0° to 360°, so that the lens body has corresponding phase compensation performance at different positions, so that the beams passing through different positions of the lens body experience the same phase delay, thereby achieving an ideal focusing effect. Since the lens assembly is formed by a number of layers of metasurface units, the transmission phase of each layer of metasurface units changes through the change of the shape of its curve graph, so that the transmission phase change of each lens assembly is more flexible, and the transmission phase of the lens assembly can be easily controlled.

[0007] Furthermore, in a low-profile microwave focusing lens as described above, the expression of the sinusoidal curve structure of the curve figure is: f(t)=a·t·sin(b·t), in which: parameter a and parameter b are constants, and parameter t is a variable; each supersurface unit adjusts one or more of the three data of the value of parameter a, the value of parameter b, and the value range of parameter t of the curve figure of its metal pattern layer, so that each supersurface unit can adjust and change the shape structure of the curve figure of its metal pattern layer, so that the transmission phase of each supersurface unit can be adjusted and changed within the range of 0° to 60°.

[0008] Furthermore, in the aforementioned low-profile microwave focusing lens, the transmission amplitude of each lens component is greater than -3dB.

[0009] Furthermore, as described above, in a low-profile microwave focusing lens, the number of layers of the super-surface units of each lens component is the same, and the number of layers of the super-surface units of each lens component is at least 6 layers.

[0010] The technical solution of the present invention has the following beneficial effects: reasonable design, simple structure, 360° all-round phase shift coverage, good focusing effect, etc.

[0011] The purpose of the present invention is to provide a production method of a low-profile microwave focusing lens, which is used to optimize the structure of the lens assembly, ensure that the lens assembly has a good transmission amplitude, and ensure that the transmission phase of the lens assembly meets the requirements.

[0012] The technical solution adopted by the present invention to solve the technical problem is: a method for producing a low-profile microwave focusing lens, and the design steps of each lens component are as follows:

[0013] S1: According to the phase distribution formula of an ideal plane lens Calculate the required target transmission phase value T target ;

[0014] S2: introducing a genetic optimization algorithm to randomly generate an initial population, the initial population including a plurality of arrays, each array including a value of a parameter a, a value of a parameter b, and a parameter of a range of values ​​of a parameter t of a curve graph of a metal pattern layer of each layer of a super surface unit of a lens assembly;

[0015] S3: Substitute the parameters in each array in the population into the expression f(t)=a·t·sin(b·t) of the sinusoidal curve structure of the curve graph of the metal pattern layer of the super surface unit of the corresponding layer of the lens component, so as to determine the shape structure of the curve graph of the metal pattern layer of each layer of the super surface unit of the lens component simulation model corresponding to each array;

[0016] S4: Simulate the lens assembly simulation model corresponding to each array through the CST unit simulation program to obtain the simulation values ​​of the transmission amplitude and the actual transmission phase;

[0017] S5: Substitute the transmission amplitude of the lens assembly simulation model corresponding to each array in the population into the transmission amplitude fitness function: Where: T amplitude (i) is the transmission amplitude simulation value of the lens component simulation model corresponding to the i-th array in the population, max(0, -3-T amplitude The value of (i)) is the transmission amplitude fitness corresponding to the i-th array in the population;

[0018] S6: The actual transmission phase of the lens assembly simulation model corresponding to each array in the population and the target transmission phase value T of the lens assembly target Substitute into the transmission phase adaptation function: Where: T phase (i) is the actual transmission phase simulation value of the lens component model corresponding to the i-th array in the population, (T phase (i)-T target ) 2 The value of is the transmission phase adaptability corresponding to the i-th array in the population;

[0019] S7: Cost value of the transmission amplitude fitness function for the population amplitude , the value of the transmission phase adaptation function Cost phase Check: If Cost amplitude Cost phase Each reaches its preset convergence condition, and the transmission amplitude fitness of each array is max(0, -3-T amplitude (i)), transmission phase adaptability (T phase (i)-T target ) 2 Select the array with the best fitness in the population, and use the parameters of the best array as the optimal solution for the parameters of the curve graph of the lens component; if Cost amplitude Cost phase If one of them cannot reach its preset convergence condition, crossover and mutation operations are performed on the parameters of each array in the population to obtain a new next-generation population, and finally steps S1 to S7 are repeated for the new next-generation population to iterate.

[0020] The technical solution of the present invention has the following beneficial effects: ensuring that the lens assembly has a good transmission amplitude and ensuring that the transmission phase of the lens assembly meets the requirements.

[0021] The object of the present invention is to provide a reflective array antenna having the advantages of reasonable design, simple structure, high gain, good directivity, etc.

[0022] The technical solution adopted by the present invention to solve its technical problem is: a reflection array antenna, including a transmission unit, a polarization grid, a reflection array, a dielectric layer and a feed source; one side of the dielectric layer is a mounting surface; the radiation end of the feed source is arranged on the mounting surface of the dielectric layer; the reflection array includes a plurality of reflection units, the plurality of reflection units are arranged on the mounting surface of the dielectric layer, and the reflection units are used to reflect electromagnetic waves; the polarization grid is arranged on the side of the reflection array facing away from the dielectric layer, and the polarization grid can switch the penetrating electromagnetic waves between linear polarization and circular polarization by state switching; the transmission unit is on the side of the polarization grid facing away from the reflection array, and the transmission unit is a low-profile microwave focusing lens as described in any one of claims 1 to 4.

[0023] Furthermore, the reflective array antenna as described above further includes a reflective substrate, a reflective surface is formed on the reflective substrate, and a surface of the dielectric layer facing away from the mounting surface is arranged on the reflective surface of the reflective substrate.

[0024] Furthermore, in the reflectarray antenna as described above, the feed source is a horn feed source.

[0025] Furthermore, in the reflective array antenna as described above, there are several feed sources, and the main radiation directions of the feed sources are different.

[0026] Furthermore, in the reflective array antenna as described above, each reflective unit is a periodic structure, so that each reflective unit has a resonant property.

[0027] The technical solution of the present invention has the following beneficial effects: by setting a transmission unit, the electromagnetic waves after passing through the polarization grid can be focused through the transmission unit, ensuring that the reflective array antenna can transmit signals in a concentrated manner in the far field area, thereby improving gain and directivity. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic structural diagram of a lens assembly of Example 1;

[0029] Figure 2 is a flow chart of Example 2;

[0030] Figure 3 This is a schematic diagram of the structure of Example 3.

[0031] Description of reference numerals:

[0032] 1-super surface unit; 11-dielectric plate; 12-metal pattern layer; 121-curve figure;

[0033] 10-transmission unit; 20-polarization grid; 30-reflection array; 301-reflection unit; 40-dielectric layer; 50-reflection substrate; 60-feed source. DETAILED DESCRIPTION

[0034] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described in detail with reference to the accompanying drawings.

[0035] Example 1

[0036] like Figure 1A low-profile microwave focusing lens of embodiment 1 includes a plurality of lens components, which are periodically arranged to form a flat lens body; each lens component includes a plurality of metasurface units 1, which are stacked in sequence; each metasurface unit 1 includes a dielectric plate 11 and a metal pattern layer 12, the metal pattern layer 12 is arranged on the dielectric plate 11, the metal pattern layer 12 includes four curve graphics 121 with the same structure, the four curve graphics 121 are arranged in a ring array around the center of the dielectric plate 11, one end of each of the four curve graphics 121 is connected and conducted at the center of the dielectric plate 11, and the shape of each curve graphic 121 is a sinusoidal structure, the farther the sinusoidal structure is from the center of the dielectric plate 11, the greater its amplitude is, and each metasurface unit 1 measures the amplitude, frequency, and overall length of the sinusoidal structure of its curve graphic 121. One or more of them are changed, so that the transmission phase of each metasurface unit 1 can be adjusted and changed in the range of 0° to 60°; each lens component can adjust the transmission phase of each lens component in the range of 0° to 360° through the phase superposition of its layers of metasurface units 1, and each lens component has a target transmission phase with a specific value according to its setting position. The target transmission phase can be calculated according to the phase distribution formula of an ideal plane lens, in which: is the target transmission phase value required by the lens component, λ is the wavelength of the light wave or electromagnetic wave, x and y respectively represent the horizontal and vertical coordinates of the lens component in the Cartesian coordinate system of the lens body plane (the center of the lens body is the coordinate origin), and f is the focal length of the lens body (the distance from the focus to the center of the lens body); through the mutual cooperation of each lens component, the transmission phase of the lens body changes periodically from the center to the surrounding within the range of 0° to 360°.

[0037] The working principle of this embodiment:

[0038] Since the lens body is composed of a number of lens components arranged periodically, and each lens component has a target transmission phase of a specific value according to its setting position, so as to form a stable phase gradient, the transmission phase of the lens body changes periodically from the center to the surroundings within the range of 0° to 360°, so that the lens body has corresponding phase compensation performance at different positions, so that the beams passing through different positions of the lens body experience the same phase delay, thereby achieving an ideal focusing effect. Since the lens assembly is formed by a number of layers of metasurface units 1, the transmission phase of each layer of metasurface units 1 changes through the change of the shape of its curve graph 121, so that the transmission phase change of each lens assembly is more flexible, and the transmission phase of the lens assembly can be easily controlled.

[0039] The expression of the sinusoidal structure of the curve graph 121 is: f(t) = a·t·sin(b·t), in which: parameter a and parameter b are constants, parameter t is a variable, parameter a affects the amplitude of the sinusoidal structure, parameter b affects the frequency of the sinusoidal structure, and the value range of parameter t affects the selection range of the sinusoidal structure of the curve graph 121 and the overall length size of the curve graph 121; each super surface unit 1 adjusts one or more of the three data of the value of parameter a, the value of parameter b, and the value range of parameter t of the curve graph 121 of its metal pattern layer 12, so that each super surface unit 1 can adjust the shape structure of the curve graph 121 of its metal pattern layer 12, so that the transmission phase of each super surface unit 1 can be adjusted and changed within the range of 0° to 60°. Through such a design, the shape structure of the curve graph 121 is regulated by the value of parameter a, the value of parameter b, and the value range of parameter t, which can more conveniently regulate the transmission phase of the super surface unit 1.

[0040] The transmission amplitude of each transmission component is greater than -3dB. Such a design can reduce the energy loss after the beam penetrates the lens component, so that the low-profile microwave focusing lens has good transmission performance.

[0041] like Figure 1 As shown, the number of layers of the super surface unit 1 of each lens assembly is the same, and the number of layers of the super surface unit 1 of each lens assembly is 6. Through such a design, the surface of the lens body can be made flat, which can facilitate the assembly of the low-profile microwave focusing lens with other components.

[0042] Example 2

[0043] like Figure 2 This is a method for producing a low-profile microwave focusing lens of Example 2. Example 2 is used to optimize the design of the lens assembly of Example 1. The design steps of each lens assembly are as follows:

[0044] S1: According to the phase distribution formula of an ideal plane lens Calculate the required target transmission phase value T target ;

[0045] S2: Introduce a genetic optimization algorithm to randomly generate an initial population, wherein the initial population includes multiple arrays, each array containing the parameters of the value of parameter a, the value of parameter b, and the value range of parameter t of the curve graph of the metal pattern layer of each layer of the supersurface unit of the lens assembly; wherein: the number of layers of the supersurface unit of the lens assembly in Example 1 is 6, the value of parameter a, the value of parameter b, and the value range of parameter t of 1 layer of supersurface unit are defined as a1, b1, t1 respectively, the value of parameter a, the value of parameter b, and the value range of parameter t of 2 layers of supersurface unit are defined as a2, b2, t2 respectively, the value of parameter a, the value of parameter b, and the value range of parameter t of 3 layers of supersurface unit are defined as a1, b1, t1 respectively, The value and value range of parameter t are defined as a3, b3, and t3 respectively, the value of parameter a, the value of parameter b, and the value range of parameter t of the 4-layer hypersurface unit are defined as a4, b4, and t4 respectively, the value of parameter a, the value of parameter b, and the value range of parameter t of the 5-layer hypersurface unit are defined as a5, b5, and t5 respectively, and the value of parameter a, the value of parameter b, and the value range of parameter t of the 6-layer hypersurface unit are defined as a6, b6, and t6 respectively, so the parameters contained in each array are a1, b1, t1, a2, b2, t2, a3, b3, t3, a4, b4, t4, a5, b5, t5, a6, b6, and t6;

[0046] S3: Substitute the parameters in each array in the population into the expression f(t)=a·t·sin(b·t) of the sinusoidal curve structure of the curve graph of the metal pattern layer of the super surface unit of the corresponding layer of the lens component, so as to determine the shape structure of the curve graph of the metal pattern layer of each layer of the super surface unit of the lens component simulation model corresponding to each array;

[0047] S4: Simulate the lens assembly simulation model corresponding to each array through the CST unit simulation program to obtain the simulation values ​​of the transmission amplitude and the actual transmission phase;

[0048] S5: Substitute the transmission amplitude of the lens assembly simulation model corresponding to each array in the population into the transmission amplitude fitness function: Where: T amplitude (i) is the transmission amplitude simulation value of the lens component simulation model corresponding to the i-th array in the population, max(0, -3-T amplitude The value of (i)) is the transmission amplitude fitness function corresponding to the i-th array in the population; wherein the purpose of the transmission amplitude fitness function is to make the transmission amplitude of the lens assembly greater than -3dB;

[0049] S6: The actual transmission phase of the lens assembly simulation model corresponding to each array in the population and the target transmission phase value T of the lens assembly target Substitute into the transmission phase adaptation function: Where: T phase(i) is the actual transmission phase simulation value of the lens component model corresponding to the i-th array in the population, (T phase (i)-T target ) 2 The value of is the transmission phase fitness corresponding to the i-th array in the population; wherein the purpose of the transmission amplitude fitness function is to make the actual transmission phase of the lens assembly meet the target transmission phase requirement;

[0050] S7: Cost value of the transmission amplitude fitness function for the population amplitude , the value of the transmission phase adaptation function Cost phase Check: If Cost amplitude Cost phase Each reaches its preset convergence condition. In this embodiment, the convergence condition of the transmission amplitude fitness function is Cost amplitude = 0, the convergence condition of the transmission phase adaptability function is Cost phase = 0, according to the transmission amplitude adaptability of each array max(0, -3-T amplitude (i)), transmission phase adaptability (T phase (i)-T target ) 2 Select the array with the best fitness in the population. If there are multiple optimal arrays, randomly select one of them, and use the parameters of the optimal array as the optimal solution for the parameter value of the curve graph of the lens component; if Cost amplitude Cost phase If one of them cannot meet its preset convergence condition, the parameters of each array in the population are crossovered (randomly exchange some parameters between two arrays) and mutated (randomly change some parameters in the array) to obtain a new next-generation population, and finally repeat steps S1 to S7 for the new next-generation population to iterate.

[0051] The lens assembly is optimized by combining the genetic optimization algorithm with the CST unit simulation program to ensure that the lens assembly has a good transmission amplitude and that the transmission phase of the lens assembly meets the requirements.

[0052] Example 3

[0053] like Figure 3A reflective array 30 antenna of embodiment 3 includes a transmission unit 10, a polarization grating 20, a reflective array 30, a dielectric layer 40, a reflective substrate 50 and a feed source 60; the reflective substrate 50 is a metal ground, and a reflective surface is formed on the reflective substrate 50; the dielectric layer 40 is arranged on the reflective surface of the reflective substrate 50, and the side of the dielectric layer 40 facing away from the reflective substrate 50 is the mounting surface; the radiation end of the feed source 60 is arranged on the mounting surface of the dielectric layer 40; the reflective array 30 includes a plurality of reflective units 301, and the plurality of reflective units 301 are arranged on the mounting surface of the dielectric layer 40, and the reflective units 301 are used to reflect electromagnetic waves; the polarization grating 20 is arranged on the side of the reflective array 30 facing away from the dielectric layer 40, and the polarization grating 20 can switch the penetrating electromagnetic waves between linear polarization and circular polarization by state switching; the transmission unit 10 is on the side of the polarization grating 20 facing away from the reflective array 30, and the transmission unit 10 is a low-profile microwave focusing lens described in embodiment 1. By providing the transmission unit 10 , the electromagnetic waves passing through the polarization grid 20 can be focused by the transmission unit 10 , ensuring that the reflective array 30 antenna can transmit signals in a concentrated manner in the far field area, thereby improving gain and directivity.

[0054] like Figure 3 As shown, the feed source 60 is a horn feed source 60, and the number of the feed sources 60 is 3, and the main radiation directions of the feed sources 60 are different. Through the independent operation of the feed sources 60, a multi-beam signal transmission function is provided.

[0055] like Figure 3 As shown, each reflection unit 301 is a metal resonant patch, and each reflection unit 301 is a periodic structure, so that each reflection unit 301 has a resonant performance. Through such a design, the reflection unit 301 resonates at a preset frequency, improving the signal reflection effect of the reflection unit 301. The shape and size of the reflection unit 301 can be adjusted according to the required frequency band to meet the needs of a wide frequency band.

Claims

1. A low-profile microwave focusing lens, characterized in that: The invention comprises a plurality of lens assemblies, which are periodically arranged to form a flat lens body; each lens assembly comprises a plurality of metasurface units, which are sequentially stacked; each metasurface unit comprises a dielectric plate and a metal pattern layer, the metal pattern layer is arranged on the dielectric plate, the metal pattern layer comprises four curve patterns with the same structure, the four curve patterns are arranged in a ring array around the center of the dielectric plate, one end of each of the four curve patterns is connected and conducted at the center of the dielectric plate, the shape of each curve pattern is a sine curve structure, the farther the sine curve structure is from the center of the dielectric plate, the greater its amplitude is, each metasurface unit changes the sine curve structure of its curve pattern, so that the transmission phase of each metasurface unit can be adjusted and varied within the range of 0° to 60°; each lens assembly can adjust and vary the transmission phase of each lens assembly within the range of 0° to 360° by superimposing the phases of its layers of metasurface units, each lens assembly has a target transmission phase of a specific value according to its setting position, and the target transmission phase is based on the phase distribution formula of an ideal plane lens It can be calculated that in this formula: T target is the target transmission phase value required by the lens assembly, λ is the wavelength of the light wave or electromagnetic wave, x and y represent the horizontal and vertical coordinates of the lens assembly in the Cartesian coordinate system of the lens body plane (the center of the lens body is the coordinate origin), and f is the focal length of the lens body (the distance from the focus to the center of the lens body); through the mutual cooperation of each lens assembly, the transmission phase of the lens body changes periodically in the range of 0° to 360° from the center to the surroundings.

2. A low-profile microwave focusing lens as claimed in claim 1, characterized in that: The expression of the sinusoidal curve structure of the curve graph is: f(t)=a·t·sin(b·t), in which: parameter a and parameter b are constants, and parameter t is a variable; each super surface unit adjusts one or more of the three data of the value of parameter a, the value of parameter b, and the value range of parameter t of the curve graph of its metal pattern layer, so that each super surface unit can adjust and change the shape structure of the curve graph of its metal pattern layer, so that the transmission phase of each super surface unit can be adjusted and changed within the range of 0° to 60°.

3. A low-profile microwave focusing lens as claimed in claim 2, characterized in that: The transmission amplitude of each lens assembly is greater than -3dB.

4. A low-profile microwave focusing lens as claimed in claim 3, characterized in that: The number of layers of the super surface units of each lens assembly is the same, and the number of layers of the super surface units of each lens assembly is at least 6 layers.

5. The method for producing a low-profile microwave focusing lens according to claim 3 or 4, characterized in that: The design steps of each lens component are as follows: S1: According to the phase distribution formula of an ideal plane lens Calculate the required target transmission phase value T target ; S2: introducing a genetic optimization algorithm to randomly generate an initial population, the initial population including a plurality of arrays, each array including a value of a parameter a, a value of a parameter b, and a parameter of a range of values ​​of a parameter t of a curve graph of a metal pattern layer of each layer of a super surface unit of a lens assembly; S3: Substitute the parameters in each array in the population into the expression f(t)=a·t·sin(b·t) of the sinusoidal curve structure of the curve graph of the metal pattern layer of the super surface unit of the corresponding layer of the lens component, so as to determine the shape structure of the curve graph of the metal pattern layer of each layer of the super surface unit of the lens component simulation model corresponding to each array; S4: Simulate the lens assembly simulation model corresponding to each array through the CST unit simulation program to obtain the simulation values ​​of the transmission amplitude and the actual transmission phase; S5: Substitute the transmission amplitude of the lens assembly simulation model corresponding to each array in the population into the transmission amplitude fitness function: Where: T amplitude (i) is the transmission amplitude simulation value of the lens component simulation model corresponding to the i-th array in the population, max(0, -3-T amplitude The value of (i)) is the transmission amplitude fitness corresponding to the i-th array in the population; S6: The actual transmission phase of the lens assembly simulation model corresponding to each array in the population and the target transmission phase value T of the lens assembly target Substitute into the transmission phase adaptation function: Where: T phase (i) is the actual transmission phase simulation value of the lens component model corresponding to the i-th array in the population, (T phase (i)-T target ) 2 The value of is the transmission phase adaptability corresponding to the i-th array in the population; S7: Cost value of the transmission amplitude fitness function for the population amplitude , the value of the transmission phase adaptability function Cost phase Check: If Cost amplitude Cost phase Each reaches its preset convergence condition, and the transmission amplitude fitness of each array is max(0, -3-T amplitude (i)), transmission phase adaptability (T phase (i)-T target ) 2 Select the array with the best fitness in the population, and use the parameters of the best array as the optimal solution for the parameters of the curve graph of the lens component; if Cost amplitude Cost phase If one of them cannot reach its preset convergence condition, crossover and mutation operations are performed on the parameters of each array in the population to obtain a new next-generation population, and finally steps S1 to S7 are repeated for the new next-generation population to iterate.

6. A reflect array antenna, characterized in that: The invention comprises a transmission unit, a polarization grid, a reflection array, a dielectric layer and a feed source; one side of the dielectric layer is a mounting surface; the radiation end of the feed source is arranged on the mounting surface of the dielectric layer; the reflection array comprises a plurality of reflection units, the plurality of reflection units are arranged on the mounting surface of the dielectric layer, and the reflection units are used to reflect electromagnetic waves; the polarization grid is arranged on the side of the reflection array facing away from the dielectric layer, and the polarization grid can switch the penetrating electromagnetic waves between linear polarization and circular polarization by state switching; The transmission unit is located on the side of the polarization grating that is facing the back reflection array, and the transmission unit is a low-profile microwave focusing lens as described in any one of claims 1 to 4.

7. A reflectarray antenna as claimed in claim 6, characterized in that: It also includes a reflective substrate, a reflective surface is formed on the reflective substrate, and the side of the dielectric layer facing away from the mounting surface is arranged on the reflective surface of the reflective substrate.

8. A reflectarray antenna as claimed in claim 6, characterized in that: The feed source is a horn feed source.

9. A reflectarray antenna as claimed in claim 6, characterized in that: The number of the feed sources is several, and the main radiation directions of the feed sources are different.

10. A reflect array antenna as claimed in claim 6, characterized in that: Each reflection unit is a periodic structure, so that each reflection unit has resonance performance.

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