A method and system for controlling a reflective array antenna based on a broadband dual-polarized unit

Abstract

The application discloses a kind of based on wideband dual polarization unit's reflection array antenna control method and system, comprising: obtaining target beam pointing instruction, and it is orthogonally decomposed into first and second polarization control vector;According to polarization control vector, the theoretical phase spectrum of each unit is calculated;Retrieve preset database and extract basic phase spectrum;Quantitative mapping is carried out by calculating the matching error between theory and basic phase spectrum, obtain the phase control code containing first and second polarization, and load to corresponding wideband dual polarization unit to drive its physical state switching, realize beam real-time reconstruction.The application compared with prior art, it can overcome the shortcomings of traditional reflection array antenna polarization component coupling serious, low phase matching degree in wideband range and not accurate phase control code acquisition, significantly enhance the independent pointing accuracy of dual polarization beam and full-band gain stability, so as to realize the flexible reconstruction of beam in polarization and frequency dimension.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of antenna technology and microwave engineering, and more particularly, to a reflection array antenna control method and system based on a wideband dual-polarized unit. BACKGROUND

[0002] With the evolution of the fifth generation and future wireless communication systems to higher frequency bands, larger capacity and more complex application scenarios, unprecedented high standards are required for the beam steering flexibility, spectrum utilization efficiency and multi-polarization information carrying capacity of the antenna system. The phase switching speed, operating bandwidth, polarization freedom and integration of the unit of the reconfigurable metasurface unit, which is the core device for realizing intelligent electromagnetic environment regulation, directly determines the performance upper limit of the entire communication system in complex scenarios such as dynamic measurement and control and perception integration. Among them, the reflection array antenna is attracting attention because it combines the high gain of the traditional parabolic antenna and the flexible beam scanning capability of the phased array antenna; the reconfigurable reflective metasurface with 1-bit phase quantization becomes an ideal solution for realizing low-cost and high-agility beam scanning because of its simple control and low loss.

[0003] In the prior art, although active reflection arrays are improved by integrating active devices and reflection array structures to realize efficient and flexible electromagnetic scattering control, there are still problems of serious polarization component coupling, low phase matching degree in a wideband range, and inaccurate phase control code acquisition.

[0004] Therefore, how to provide a reflection array antenna control method based on a wideband dual-polarized unit, which can overcome the shortcomings of traditional reflection array antennas, such as serious polarization component coupling, low phase matching degree in a wideband range, and inaccurate phase control code acquisition, has become a technical problem to be solved by those skilled in the art. SUMMARY

[0005] To solve the above technical problems, the present application provides a reflection array antenna control method based on a wideband dual-polarized unit, which can overcome the shortcomings of traditional reflection array antennas, such as serious polarization component coupling, low phase matching degree in a wideband range, and inaccurate phase control code acquisition, and significantly enhance the independent pointing accuracy of dual-polarized beams and the stability of full-band gain, thereby realizing flexible reconstruction of beams in the polarization and frequency dimensions.

[0006] The first technical solution provided by the present application is as follows:

[0007] The application provides a wideband dual-polarized unit-based reflectarray control method, comprising the following steps: S1, obtaining a target beam pointing instruction and decomposing the target beam pointing instruction into a first polarization control vector and a second polarization control vector, the first polarization control vector and the second polarization control vector being orthogonal to each other; S2, calculating a theoretical phase spectrum of each wideband dual-polarized unit according to the first polarization control vector and the second polarization control vector; S3, extracting a basic phase spectrum of the wideband dual-polarized unit according to a preset wideband frequency response database; S4, calculating a matching error between the theoretical phase spectrum and the basic phase spectrum of each wideband dual-polarized unit, and quantitatively mapping the theoretical phase spectrum based on the matching error to obtain a phase control code, the phase control code comprising a first polarization phase control code and a second polarization phase control code; wherein the wideband dual-polarized unit has two groups of orthogonally arranged dipole groups, the physical working state of the dipole group comprising a first conduction state and a second cutoff state; and the phase control code is used to drive the physical working state of the dipole group to switch to a physical working state corresponding to the phase control code.

[0008] Further, in a preferred mode of the application, the step of calculating the matching error between the theoretical phase spectrum and the basic phase spectrum of each wideband dual-polarized unit comprises:

[0009] obtaining a working frequency band of the wideband dual-polarized unit, discretely processing the working frequency band to obtain a plurality of frequency sampling points;

[0010] respectively obtaining a theoretical compensation phase and a physical phase response of each frequency sampling point, and calculating an original phase difference between the theoretical compensation phase and the physical phase response at each frequency sampling point;

[0011] weighting the absolute value of the original phase difference based on each frequency sampling point to obtain a weighted phase error component;

[0012] cumulatively summing the weighted phase error component corresponding to each frequency sampling point to obtain a matching error.

[0013] Further, in a preferred mode of the application, the step of weighting the absolute value of the original phase difference comprises:

[0014] obtaining a center frequency of the working frequency band and calculating a frequency deviation absolute value of each frequency sampling point from the center frequency value;

[0015] mapping the frequency deviation absolute value according to a preset attenuation function to obtain a frequency weighting coefficient corresponding to each frequency sampling point;

[0016] The absolute value of the original phase difference is multiplied by the corresponding frequency weighting coefficient to obtain the weighted phase error component.

[0017] Further, in a preferred mode of the present application, the step of constructing the attenuation function comprises:

[0018] The wideband frequency response database is called to extract simulation gain data of the wideband dual-polarized unit in the working frequency band, and a gain frequency characteristic curve is constructed according to the simulation gain data;

[0019] The maximum gain value of the gain frequency characteristic curve at the center frequency is extracted, and the gain frequency characteristic curve is normalized according to the maximum gain value to obtain a normalized gain distribution;

[0020] The normalized gain distribution is functionally fitted to obtain an attenuation function.

[0021] Further, in a preferred mode of the present application, the step of quantitatively mapping the theoretical phase spectrum based on the matching error to obtain the phase control code comprises:

[0022] According to the wideband frequency response database, a first basic phase spectrum in a first on-state and a second basic phase spectrum in a second off-state are obtained;

[0023] The first matching error between the theoretical phase spectrum and the first basic phase spectrum, and the second matching error between the theoretical phase spectrum and the second basic phase spectrum are calculated respectively;

[0024] The first matching error and the second matching error are compared, and if the first matching error is less than the second matching error, the control code of the first basic phase spectrum is determined as the phase control code;

[0025] If the first matching error is greater than the second matching error, the control code of the second basic phase spectrum is determined as the phase control code.

[0026] Further, in a preferred mode of the present application, the step of calculating the theoretical phase spectrum of each wideband dual-polarized unit comprises:

[0027] A spatial coordinate system of the reflectarray antenna is established, and the spatial position coordinates of each wideband dual-polarized unit in the spatial coordinate system are obtained;

[0028] According to the target beam pointing instruction, the wave vector of the target beam is determined, and the spatial wave path difference between the wave vector and each spatial position coordinate is calculated;

[0029] The spatial path difference is converted into a phase delay based on the frequency sampling points, and the phase delays of each frequency sampling point are combined to generate a theoretical phase spectrum.

[0030] Further, in a preferred embodiment of the present invention, the target beam pointing command in step [1] is decomposed into a first polarization control vector and a second polarization control vector, including:

[0031] Obtain the first polarization direction corresponding to the first polarization port of the broadband dual polarization unit, and the second polarization direction corresponding to the second polarization port;

[0032] The target electric field vector corresponding to the target beam pointing command is orthogonally projected onto the first polarization direction and the second polarization direction, respectively, to obtain the first polarization control vector projected onto the first polarization direction and the second polarization control vector projected onto the second polarization direction.

[0033] Furthermore, in a preferred embodiment of the present invention, the broadband dual-polarization unit is configured to a first on state and a second off state, and a first phase control code corresponding to the first on state and a second phase control code corresponding to the second off state are established.

[0034] Electromagnetic simulation was performed on the broadband dual-polarization unit to obtain the basic phase spectrum and simulation gain data of the broadband dual-polarization unit in the first conduction state, and the basic phase spectrum and simulation gain data in the second cutoff state.

[0035] Establish a mapping index relationship between the basic phase spectrum, the simulated gain data and the phase control code, and construct a broadband frequency response database based on the mapping index relationship.

[0036] The present invention provides a second technical solution as follows:

[0037] The present invention also provides a control system for a reflective array antenna based on a broadband dual-polarization unit, the system being used to execute the above-described control method for a reflective array antenna based on a broadband dual-polarization unit, the system comprising:

[0038] An array antenna surface, which is composed of a number of broadband dual-polarization units arranged periodically;

[0039] A control module is electrically connected to each of the broadband dual-polarization units in the array antenna surface, and is used to execute the reflective array antenna control method based on broadband dual-polarization units.

[0040] Furthermore, in a preferred embodiment of the present invention, the broadband dual-polarization unit comprises:

[0041] The medium layer comprises a top medium layer, a middle medium layer and a bottom medium layer arranged in sequence;

[0042] An upper end of the top medium layer is provided with a radiation layer, the radiation layer comprises a dipole group, a ground patch and a switch assembly;

[0043] The number of the dipole group is 2 groups, two dipoles in the same group are oppositely arranged, and four dipoles of two dipole groups are orthogonally arranged;

[0044] The ground patch is arranged between two dipoles of the dipole group and connected with the dipole through the switch assembly;

[0045] A ground metal layer is arranged between the top medium layer and the middle medium layer, a choke metal layer is arranged between the middle medium layer and the bottom medium layer, and a bias metal layer is arranged on a lower surface of the bottom medium layer;

[0046] The ground patch is connected with the ground metal layer by passing through the top medium layer downwards;

[0047] The dipole is insulated from the ground metal layer by passing through the ground metal layer through a metalized via, and the dipole is electrically connected to the choke metal layer and the bias metal layer downwards.

[0048] The application provides a kind of based on wideband dual polarization unit's reflection array antenna control method, it can overcome the shortcomings of traditional reflection array antenna polarization component coupling serious, low in wideband range phase matching degree and not accurate phase control code acquisition, significantly enhance the independent pointing accuracy of dual polarized beam and full-band gain stability, to realize the flexible reconstruction of beam in polarization and frequency dimension.The kind of based on wideband dual polarization unit's reflection array antenna method includes: S1 obtains target beam pointing instruction, and the target beam pointing instruction is decomposed into first polarization control vector and second polarization control vector, the first polarization control vector and second polarization control vector are orthogonal to each other;S2 according to the first polarization control vector and the second polarization control vector, calculate the theoretical phase spectrum of each wideband dual polarization unit;S3 according to the preset wideband frequency response database, extract the basic phase spectrum of the wideband dual polarization unit;S4 calculate the matching error between the theoretical phase spectrum of each wideband dual polarization unit and the basic phase spectrum, and the theoretical phase spectrum is quantized mapping based on the matching error, obtain phase control code, the phase control code includes first polarization phase control code and second polarization phase control code;Wherein, the wideband dual polarization unit has 2 groups of orthogonal setting dipole group, the physical working state of the dipole group includes first conduction state and second cut-off state;The phase control code is used to drive the physical working state of the dipole group to switch to the physical working state corresponding to the phase control code.Wherein, by acquiring the target beam pointing instruction and decomposing the target beam pointing instruction into mutually orthogonal first polarization control vector and second polarization control vector, the vector orthogonal decomposition mechanism breaks the logical barrier of mutual restraint of components in the prior art of dual-polarized beam regulation, establishes an independent decoupling framework of polarization dimension, and effectively solves the problem of serious polarization component coupling in the traditional reflective array antenna beam regulation process; secondly, by calculating the theoretical phase spectrum of each wideband dual-polarized unit according to the polarization control vector, and combining the preset database to extract the basic phase spectrum, a global comparison system of full-band spectrum and basic response is established at the frequency domain layer, which provides a continuous observation window for the phase consistency in the wideband range, prevents the performance deterioration at the edge of the frequency band caused by relying only on single-frequency point phase design, and significantly enhances the phase matching degree in the wideband range; the mechanism of utilizing the matching error between the calculated theoretical phase spectrum and the basic phase spectrum and quantitatively mapping based on the matching error realizes the accurate alignment of the theoretical beam requirement and the physical unit state, ensures that the finally obtained phase control code can drive the wideband dual-polarized unit to switch to the physical working state with the minimum error, avoids the mapping distortion caused by the lack of error optimization in the traditional scheme, and thus greatly improves the accuracy of the phase control code acquisition; Compared with the prior art, the present application can overcome the shortcomings of traditional reflective array antenna polarization component coupling, low phase matching degree in the wideband range and inaccurate phase control code acquisition, significantly enhance the independent pointing accuracy of dual-polarized beam and the full-band gain stability, and thus realize the flexible reconstruction of beam in polarization and frequency dimensions. BRIEF DESCRIPTION OF DRAWINGS

[0049] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0050] Figure 1 The step flow chart of the reflective array antenna control method based on wideband dual-polarized unit provided by the embodiments of the present application;

[0051] Figure 2 The normalized directional diagram of X polarization scanning azimuth plane for the working frequency of 8.5GHz;

[0052] Figure 3 The normalized directional diagram of X polarization scanning azimuth plane for the working frequency of 10.5GHz;

[0053] Figure 4 The normalized directional diagram of X polarization scanning azimuth plane for the working frequency of 12.5GHz;

[0054] Figure 5 Y polarization scanning azimuth plane normalized pattern for the operating frequency of 8.5GHz;

[0055] Figure 6 Y polarization scanning azimuth plane normalized pattern for the operating frequency of 10.5GHz;

[0056] Figure 7 Y polarization scanning azimuth plane normalized pattern for the operating frequency of 12.5GHz;

[0057] Figure 8 Reflection amplitude and phase curve of the wideband dual-polarized unit provided by the embodiment of the application;

[0058] Figure 9 Current distribution diagram of the dipole in the first conduction state;

[0059] Figure 10 Current distribution diagram of the ground metal layer in the first conduction state;

[0060] Figure 11 Current distribution diagram of the dipole in the second cut-off state;

[0061] Figure 12 Current distribution diagram of the ground metal layer in the second cut-off state;

[0062] Figure 13 Three-dimensional structure diagram of the wideband dual-polarized unit;

[0063] Figure 14 Hierarchical schematic diagram of the wideband dual-polarized unit;

[0064] Figure 15 Radiation layer plane schematic diagram of the wideband dual-polarized unit;

[0065] Figure 16 Three-dimensional perspective view of the wideband dual-polarized unit;

[0066] Figure 17 Sectional view of the wideband dual-polarized unit.

[0067] The figure mark: 1, dielectric layer; 101, top dielectric layer; 102, middle dielectric layer; 103, bottom dielectric layer; 2, radiation layer; 201, dipole group; 201a, dipole; 202, ground patch; 203, switch assembly; 3, metal layer; 301, ground metal layer; 302, choke metal layer; 303, bias metal layer; 4, metallized via. DETAILED DESCRIPTION

[0068] In order for those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0069] It should be noted that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or indirectly disposed on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0070] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "first", "second", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0071] In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" and "several" is two or more, unless otherwise explicitly and specifically limited.

[0072] It should be understood that the structures, proportions, sizes, etc. shown in the drawings of the present application are only used to cooperate with the content disclosed in the specification, to enable those skilled in the art to understand and read, and do not have technical substantive significance, and any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the present application, should still fall within the scope of the technical content disclosed by the present application.

[0073] As shown in FIG. 1, the present application provides a wideband dual-polarized element-based reflectarray antenna control method, which can overcome the shortcomings of traditional reflectarray antenna polarization component coupling, low phase matching degree in wideband range, and inaccurate phase control code acquisition, significantly enhance the independent pointing accuracy of dual-polarized beams and the stability of full-band gain, and thus realize flexible reconstruction of beams in the polarization and frequency dimensions. Figures 1 to 8 As shown in FIG. 1, the present application provides a wideband dual-polarized element-based reflectarray antenna control method, which can overcome the shortcomings of traditional reflectarray antenna polarization component coupling, low phase matching degree in wideband range, and inaccurate phase control code acquisition, significantly enhance the independent pointing accuracy of dual-polarized beams and the stability of full-band gain, and thus realize flexible reconstruction of beams in the polarization and frequency dimensions.

[0074] A reflection array antenna control method based on a wideband dual-polarized unit comprises the following steps: S1, obtaining a target beam pointing instruction and decomposing the target beam pointing instruction into a first polarization control vector and a second polarization control vector, the first polarization control vector and the second polarization control vector being mutually orthogonal; S2, calculating a theoretical phase spectrum of each wideband dual-polarized unit according to the first polarization control vector and the second polarization control vector; S3, extracting a basic phase spectrum of the wideband dual-polarized unit according to a preset wideband frequency response database; S4, calculating a matching error between the theoretical phase spectrum and the basic phase spectrum of each wideband dual-polarized unit, and quantitatively mapping the theoretical phase spectrum based on the matching error to obtain a phase control code, the phase control code comprising a first polarization phase control code and a second polarization phase control code; wherein the wideband dual-polarized unit has two groups of orthogonally arranged dipole groups, and the physical working state of the dipole group comprises a first conduction state and a second cutoff state; the phase control code is used to drive the physical working state of the dipole group to switch to a physical working state corresponding to the phase control code. Wherein, by obtaining the target beam pointing instruction and decomposing the target beam pointing instruction into the mutually orthogonal first polarization control vector and the second polarization control vector, this kind of vector orthogonal decomposition mechanism breaks the logical barrier of mutual restraint of components in the prior art when dual-polarized beam is regulated and controlled, establishes an independent decoupling framework in the polarization dimension, and effectively solves the problem of serious polarization component coupling in the traditional reflection array antenna beam regulation process. Secondly, by calculating the theoretical phase spectrum of each wideband dual-polarized unit according to the polarization control vector, and combining the preset database to extract the basic phase spectrum, a global comparison system of full-band spectrum and basic response is constructed at the frequency domain layer, which provides a continuous observation window for the phase consistency in the wideband range, prevents the performance deterioration at the edge of the frequency band caused by relying only on single-frequency point phase design, and significantly enhances the phase matching degree in the wideband range. By using the mechanism of calculating the matching error between the theoretical phase spectrum and the basic phase spectrum and quantitatively mapping based on the matching error, the accurate alignment of the theoretical beam requirement and the physical unit state is realized, and it is ensured that the finally obtained phase control code can drive the wideband dual-polarized unit to switch to the physical working state with the minimum error, avoiding the mapping distortion caused by the lack of error optimization in the traditional scheme, thereby greatly improving the accuracy of the phase control code acquisition. Compared with the prior art, the present application can overcome the shortcomings of serious polarization component coupling of the traditional reflection array antenna, low phase matching degree in the wideband range, and inaccurate phase control code acquisition, significantly enhance the independent pointing accuracy of the dual-polarized beam and the full-band gain stability, and thus realize the flexible reconstruction of the beam in the polarization and frequency dimensions.

[0075] The steps of the reflection array antenna control method based on the wideband dual-polarized unit are described in detail below in combination with specific embodiments.

[0076] Specifically, in the embodiments of the present application, the step of calculating the matching error between the theoretical phase spectrum and the basic phase spectrum of each wideband dual-polarized unit comprises: obtaining the working frequency range of the wideband dual-polarized unit, discretizing the working frequency range to obtain a plurality of frequency sampling points; obtaining the theoretical compensation phase and the physical phase response of each frequency sampling point respectively, and calculating the original phase difference between the theoretical compensation phase and the physical phase response of each frequency sampling point; based on each frequency sampling point, weighting the absolute value of the original phase difference to obtain a weighted phase error component; and accumulating and summing the weighted phase error components corresponding to each frequency sampling point to obtain the matching error.

[0077] In the embodiments of the present application, first, a preset working frequency range of the wideband dual-polarized unit in an actual application scenario is obtained, for example, a specific range of the X waveband is selected as the target interval, and the continuous working frequency range is discretized to be divided into a plurality of equally spaced frequency sampling points according to a preset frequency step, or a plurality of key frequency points are selected as the frequency sampling points according to the channel division standard of the communication protocol; then for each frequency sampling point, the theoretical compensation phase corresponding to the frequency point is parsed from the beam control instruction, and the physical phase response value of the wideband dual-polarized unit at the frequency point is retrieved from the pre-established database, wherein the theoretical compensation phase is the ideal phase delay value required to compensate for the spatial path difference of the wideband dual-polarized unit due to the specific spatial position of the array, so as to ensure that the electromagnetic waves reflected by the units at different positions are in phase superimposed in the preset target beam pointing direction; the original phase difference at each frequency sampling point is calculated by subtracting the physical phase response value from the theoretical compensation phase; then based on the importance of each frequency sampling point within the antenna working bandwidth, the absolute value of the calculated original phase difference is weighted, that is, each frequency sampling point is assigned a corresponding weight coefficient, the absolute value of the original phase difference is multiplied by the weight coefficient to obtain the weighted phase error component corresponding to the frequency point, and the setting of the weight coefficient can focus on the performance maintenance of the center frequency point or the high gain frequency point; finally, the weighted phase error components corresponding to all frequency sampling points are accumulated and summed to obtain a comprehensive matching error value representing the phase matching degree of the full frequency range, and the smaller the matching error value, the higher the fitting degree of the current physical state to the theoretical beam requirement in the entire wideband range, which can effectively take into account the phase consistency of the frequency band edge and the center frequency, and avoid the frequency band distortion problem caused by single frequency point matching.

[0078] As Figures 2 to 7To verify the effectiveness of the above broadband error calculation scheme in improving the broadband performance of the reflectarray antenna, a test environment based on full-wave electromagnetic simulation software is built, and a broadband dual-polarized unit with a working frequency range of 8.8 GHz to 12.1 GHz is selected as the test object. The experimental first obtains the basic phase data of the unit according to the method of the application. The unit realizes a stable 180-degree phase difference within a range covering 31.6% of the relative bandwidth, providing a physical basis for broadband error matching. Then, the experimental group uses the broadband weighted error calculation method proposed in the application to optimize the phase, and selects typical frequency sampling points covering low frequency 8.5 GHz, center frequency 10.5 GHz and high frequency 12.5 GHz in the simulation environment for verification. Under the same main beam pointing instruction, thanks to the accumulation summation and weighted control of the frequency sampling point error, the main beam pointing of the antenna at the three widely spanned frequency points of 8.5 GHz, 10.5 GHz and 12.5 GHz remains highly consistent, and the beam divergence or pointing deflection phenomenon caused by frequency deviation in the traditional single frequency point design does not occur. The experimental results show that the beam side lobe average of the three frequency points in the specification drawings is lower than-10 dB and the main lobe shape is full, fully proving that the matching error calculation mechanism based on the accumulation summation of the frequency sampling points can effectively suppress the frequency dispersion effect, and significantly improve the beam pointing accuracy and gain stability of the reflectarray antenna under wideband working conditions.

[0079] Specifically, in the specific embodiments of the application, the step of weighting the absolute value of the original phase difference comprises: obtaining the center frequency of the working frequency range, and calculating the frequency deviation absolute value of each frequency sampling point and the center frequency value; mapping the frequency deviation absolute value according to a preset attenuation function to obtain a frequency weighting coefficient corresponding to each frequency sampling point; and multiplying the absolute value of the original phase difference by the corresponding frequency weighting coefficient to obtain a weighted phase error component.

[0080] In the embodiment of the present application, firstly, the spectral center of the working frequency band needs to be accurately positioned, and usually the arithmetic mean of the working frequency band is selected as the center frequency reference, for example, in the range of 26GHz to 30GHz of Ka band, 28GHz is set as the center frequency, then each frequency sampling point after discretization processing is traversed, the difference between the current frequency sampling point and the center frequency is calculated by numerical subtraction, and the absolute value of the difference is taken to obtain the frequency deviation absolute value, which directly reflects the degree of deviation of the current sampling point from the center working frequency point; then based on the pre-set attenuation function model, for example, the Gaussian distribution function or the cosine square roll-off function is selected as the mapping kernel, the frequency deviation absolute value calculated above is input into the function model as the independent variable, since the attenuation function has the characteristics of central maximum and two-wing decrease, the frequency weighting coefficient corresponding to each frequency sampling point can be calculated, so that the sampling point close to the center frequency obtains a high weight close to 1, and the sampling point located at the edge of the frequency band obtains a lower weight; finally, weighted operation is performed, the original phase difference absolute value at each frequency sampling point is multiplied by the frequency weighting coefficient corresponding to the point, thereby obtaining the weighted phase error component, the size of the component depends not only on the difference between the physical phase and the theoretical phase, but also on the importance of the frequency point in the whole working bandwidth, which can ensure that in the subsequent error accumulation, the optimization algorithm preferentially ensures the phase matching accuracy of the center frequency band and the high energy efficiency frequency band, and prevents the gain collapse of the antenna core working frequency band due to excessive accommodation of the phase error of the edge frequency point.

[0081] Specifically, in the specific embodiment of the present application, the construction step of the attenuation function comprises: calling a wideband frequency response database, extracting simulation gain data of the wideband dual-polarized unit in the working frequency band, and constructing a gain frequency characteristic curve according to the simulation gain data; extracting the maximum gain value of the gain frequency characteristic curve at the center frequency, and performing normalization processing on the gain frequency characteristic curve according to the maximum gain value to obtain a normalized gain distribution; function fitting is performed on the normalized gain distribution to obtain the attenuation function.

[0082] In the embodiments of the present application, firstly, a preset broadband frequency response database is called, which is established based on full-wave electromagnetic simulation software of finite element method or finite integration method, periodic boundary conditions are applied to the X-axis and Y-axis boundaries of the broadband dual-polarized unit in the simulation setting to simulate the infinite array environment, and a Floquet port is set in the Z-axis direction for broadband plane wave excitation, so as to obtain discrete gain data points with a step of 0.1 GHz in the range of 8.8 GHz to 12.1 GHz; then in order to eliminate the data discontinuity caused by the frequency sampling interval, a cubic spline interpolation algorithm is used to smooth the above discrete gain data, so as to generate a smooth gain frequency characteristic curve with continuously changing curvature in the full frequency band; then taking the center frequency 10.5 GHz as the reference, the maximum gain value on the curve is extracted as the normalization denominator, and the gain values of all frequency points on the curve are divided by the maximum gain value, to obtain a normalized gain data set with values distributed between 0 and 1; finally, a Gaussian-type decay function model with frequency deviation as the independent variable is constructed, the mathematical form of the model is an exponential function with natural constant as the base, the exponential part is the negative value of the ratio of the square of the frequency deviation to the decay coefficient, and the decay coefficient in the model is solved by using the nonlinear least squares method, the specific process is as follows: firstly, an estimated value of the decay coefficient is initialized, the sum of the squares of the residuals between the current model output value and the actual normalized gain data is calculated, then the gradient direction of the sum of the squares of the residuals with respect to the decay coefficient is calculated, and the decay coefficient is updated in the direction of gradient descent with a preset learning rate, the above steps of calculating the residual, solving the gradient and updating the parameter are repeated until the change of the sum of the squares of the residuals calculated by the adjacent two iterations is less than the preset convergence threshold, for example, the convergence threshold can be set to negative 6th power of 10, at this time, the corresponding decay coefficient is the optimal solution, so as to determine the final decay function expression, which converts the discrete physical simulation data into continuous and analytical mathematical expression, and provides a derivable accurate error weight model for the subsequent control algorithm.

[0083] To verify the accuracy of the above attenuation function based on cubic spline interpolation and nonlinear fitting and its influence on beam quality, a 16x16 element numerical simulation platform of the reflectarray antenna is built, and tests are carried out in the frequency band of 8.8GHz to 12.1GHz; two groups of controls are set in the experiment, the experimental group adopts the fitting method detailed in the embodiment, that is, first obtain a continuous curve through cubic spline interpolation, and then calculate the optimal Gaussian attenuation constant through least square method iteration; the control group directly calls discrete data by using the traditional linear interpolation method, or uses the unoptimized standard cosine function as the fixed weight attenuation model; the comparison data shows that at 12.0GHz far from the center frequency, due to the use of the unoptimized standard function, the control group has deviation between the weighting coefficient and the actual physical gain recession characteristics of the element, resulting in about 2.1dB prediction error of the main lobe gain of the beam, and the sidelobe level is lifted to-13dB; while the experimental group benefits from the retention of the frequency response details by cubic spline interpolation and the accurate locking of the attenuation parameters by least square method, the correlation coefficient between the function curve generated by it and the actual physical test curve is more than 0.99, which makes the beam gain prediction error at 12.0GHz reduced to within 0.3dB, and effectively suppresses the sidelobe level below-17dB; the results strongly prove the necessity of converting physical data into mathematical model through high-order interpolation and nonlinear fitting, which eliminates the quantization noise caused by discrete sampling and significantly improves the robustness of wideband beam control.

[0084] Specifically, in the embodiment of the application, the step of quantitatively mapping the theoretical phase spectrum based on the matching error to obtain the phase control code comprises: obtaining a first basic phase spectrum of a first on-state and a second basic phase spectrum of a second off-state from a wideband frequency response database; calculating a first matching error between the theoretical phase spectrum and the first basic phase spectrum, and a second matching error between the theoretical phase spectrum and the second basic phase spectrum; comparing the first matching error with the second matching error, if the first matching error is smaller than the second matching error, determining the control code of the first basic phase spectrum as the phase control code; if the first matching error is greater than the second matching error, determining the control code of the second basic phase spectrum as the phase control code.

[0085] Wherein, in the embodiment of the application, firstly, the full-band phase response data of the wideband dual-polarized unit in two completely different physical bias states are respectively called based on the pre-constructed wideband frequency response database, wherein the first conducting state corresponds to the conducting state of the switch component, for example, the bias voltage is 1.33V, at this time the unit presents electric dipole resonance characteristics and provides a reflection phase of about 180 degrees, and the second cut-off state corresponds to the cut-off state of the switch component, for example, the bias voltage is 0V, at this time the unit presents magnetic dipole resonance characteristics and provides a reflection phase of about 0 degrees; then, according to the theoretical phase spectrum calculated in the foregoing step, two independent error calculation processes are respectively performed, the first path calculation adds the phase difference between the theoretical phase spectrum and the first basic phase spectrum at each frequency sampling point, thereby obtaining a scalar value as the first matching error, which represents the overall deviation of the unit in the entire wideband range if it is forced to be set to the conducting state; the second path calculation compares the theoretical phase spectrum with the second basic phase spectrum, and obtains the second matching error; then, a numerical comparison operation is performed at the digital logic level, and the first matching error and the second matching error are compared in size, if the value of the first matching error is smaller, it indicates that the conducting state can more closely approximate the theoretical beam requirement in the wideband frequency domain, and the system locks the binary code (such as logic "1") corresponding to the conducting state as the final output; otherwise, if the second matching error is smaller, it is determined that the cut-off state is the current optimal solution, and the binary code (such as logic "0") corresponding to the cut-off state is determined as the output; finally, the selected phase control code is sent to the corresponding wideband dual-polarized unit bias circuit through the IO port of the FPGA array, the switch component is switched to the selected physical working state, and the physical modulation of electromagnetic waves is completed.

[0086] More specifically, as shown in Figure 8 in the embodiment of the application, Figure 8The electromagnetic simulation results of the broadband dual-polarized unit in the ON and OFF two physical states are shown: the figure shows the electromagnetic simulation characteristics of the broadband dual-polarized unit described in the application in the ON and OFF two physical states. The horizontal coordinate in the figure is the operating frequency (about 7-13 GHz), the left vertical coordinate represents the reflection amplitude (0-35 dB), and the right vertical coordinate represents the reflection phase (-200°-250°). The reading rule is indicated by the arrows in the figure: the upper left arrow indicates that the solid line data refers to the left axis, showing that the unit has low loss characteristics in both states; the lower right arrow indicates that the dashed line data refers to the right axis. It is particularly important to note that the black dashed oval in the right side of the figure is highlighted and identified as the phase difference curve (i.e., the black dashed line), and in combination with the effective operating bandwidth (about 8.8-12.1 GHz) indicated by the light blue shaded area and the two cyan horizontal dashed lines (160° and 200° limits), it can be seen that the unit always maintains a phase difference interval of 180°±20° in the wideband range, fully verifying its stable wideband 1-bit phase control capability.

[0087] Specifically, in specific embodiments of the application, the step of calculating the theoretical phase spectrum of each broadband dual-polarized unit includes: establishing a spatial coordinate system of the reflective array antenna, and obtaining the spatial position coordinates of each broadband dual-polarized unit in the spatial coordinate system; determining the wave vector of the target beam according to the target beam pointing instruction, and calculating the spatial wave path difference between the wave vector and each spatial position coordinate; converting the spatial wave path difference into a phase delay based on the frequency sampling points, and combining the phase delay of each frequency sampling point to generate a theoretical phase spectrum.

[0088] In specific embodiments of the application, first, a Cartesian rectangular coordinate system with the geometric center of the reflective array as the origin is constructed, the plane on which the array is located is set as the XOY plane, and the normal direction is the Z axis; based on the array design parameters, the array size is set to 16 rows by 16 columns, and the unit period is 14.5 mm. For any one broadband dual-polarized unit in the mth row and nth column of the array, the spatial position coordinates of its geometric center are calculated according to its index value in the array, thereby determining the physical position of each unit relative to the phase reference center; then the target beam pointing instruction is analyzed, the elevation angle and azimuth angle of the target beam are extracted, the wave vector direction of the target beam is determined according to the plane wave approximation principle, and the spatial wave path difference produced when the wave vector is projected to each unit position is calculated. The formula for calculating the spatial wave path difference is as follows:

[0089] ;

[0090] wherein, represents the spatial wave path difference, represents the horizontal coordinate of the unit, a longitudinal coordinate of the unit, an elevation angle of the target beam, an azimuth angle of the target beam; then, a frequency domain conversion stage is entered, in which, in a working frequency band of 8.8 GHz to 12.1 GHz, a plurality of frequency sampling points determined according to a discretization process are used to convert the spatial path difference calculated above into corresponding phase delay values one by one by using a phase delay calculation logic, which is phase delay equal to spatial path difference multiplied by two times pi and then multiplied by a current sampling frequency, and finally divided by the speed of light; finally, the phase delay values calculated for all the frequency sampling points are arranged and combined in frequency order to generate a theoretical phase spectrum vector specific to the unit, which accurately describes the ideal phase compensation value that should be provided by the physical unit in order to make the electromagnetic waves of different frequencies in space at the same point in phase superposition.

[0091] Specifically, in the embodiments of the present application, the step of decomposing the target beam pointing instruction into a first polarization control vector and a second polarization control vector comprises: obtaining a first polarization direction corresponding to a first polarization port of the wideband dual-polarized unit and a second polarization direction corresponding to a second polarization port; and orthogonally projecting a target electric field vector corresponding to the target beam pointing instruction to the first polarization direction and the second polarization direction to obtain a first polarization control vector projected on the first polarization direction and a second polarization control vector projected on the second polarization direction.

[0092] In the embodiments of the present application, first, a polarization reference coordinate system strictly corresponding to the physical structure of the wideband dual-polarized unit needs to be established, based on the layout characteristics of the surface metal layer of the unit, the axial extension direction of the first pair of bow-tie dipoles is defined as the first polarization direction, i.e. the X-axis direction, and the axial extension direction of the second pair of bow-tie dipoles distributed perpendicular to the first polarization direction is defined as the second polarization direction, i.e. the Y-axis direction, thereby determining the polarization basis vectors of the physical ports; after receiving the target beam pointing instruction containing the spatial angle and the polarization state, the system does not directly process it as a single scalar, but constructs it into an electric field vector in the target space based on electromagnetic field theory; then, an orthogonal projection operation is performed to calculate the dot product of the target electric field vector and the unit vector of the first polarization direction, i.e. to obtain the projection component of the target vector on the X-axis as the first polarization control vector, which represents the electric field component size and phase required by the X-axis direction dipole to synthesize the target beam; the dot product of the target electric field vector and the unit vector of the second polarization direction is calculated synchronously to obtain the projection component of the target vector on the Y-axis as the second polarization control vector; through this decomposition mechanism, whether the target instruction requests a horizontal linear polarization, a vertical linear polarization, a 45-degree slant polarization or a circular polarization beam, the system can decompose it into two orthogonal scalar instructions that can be independently executed by physical hardware, ensuring that the generation of the subsequent phase control code can drive the switch component network of the X-axis and the Y-axis to realize the polarization synthesis of the beam at the physical level.

[0093] As Figures 9 to 12 shown, to verify the effectiveness of the above-mentioned vector orthogonal decomposition mechanism in the physical layer and the polarization isolation degree, simulation analysis of the surface current distribution is carried out based on the wideband dual-polarized unit; when a vertical direction (Y polarization) excitation is applied, the surface current vector distribution diagrams of the unit in the on and off states of the switch assembly; the experimental data show that, in the on state of the switch assembly, the current distribution on the dipole is in the same direction as the floor current distribution, showing the electric dipole resonance characteristics, and generating a 180-degree phase; in the off state of the switch assembly, the current on the dipole is opposite to the direction of the floor current, forming a ring-shaped loop, i.e. the magnetic dipole resonance characteristics, generating a 0-degree phase; the most critical is that in either state, although there is induced current on the dipole arm in the horizontal direction (X polarization direction) in the figure, the current flows in opposite directions and cancels each other out in far-field radiation, without forming an effective X polarization radiation component; this experimental phenomenon directly proves that the wideband dual-polarized unit of the application has a natural orthogonal isolation characteristic in the physical structure, and there is no significant polarization crosstalk, thereby powerfully demonstrating the physical correctness of the processing method of decomposing the target beam instruction into orthogonal control vectors, and ensuring that the two polarization channels can be independently controlled without interfering with each other.

[0094] Specifically, in the embodiment of the application, the step of establishing the wideband frequency response database comprises: configuring the wideband dual-polarized unit into a first on state and a second off state respectively, and establishing a first phase control code corresponding to the first on state and a second phase control code corresponding to the second off state; performing electromagnetic simulation on the wideband dual-polarized unit, and respectively acquiring the basic phase frequency spectrum and the simulation gain data of the wideband dual-polarized unit in the first on state, and the basic phase frequency spectrum and the simulation gain data in the second off state; establishing a mapping index relationship between the basic phase frequency spectrum, the simulation gain data and the phase control code, and constructing the wideband frequency response database based on the mapping index relationship.

[0095] Wherein, in the embodiment of the application, firstly, the physical model of the broadband dual-polarized unit needs to be accurately established in the full-wave electromagnetic simulation software, the medium layer properties are set according to the parameters in the technical disclosure, the top layer adopts Arlon AD350A with a relative dielectric constant of 3.5, the middle adhesive layer adopts Rogers 4450F with a relative dielectric constant of 3.7, the bottom layer adopts FR-4, and the lumped element equivalent circuit of the switch component in two working states is defined, wherein the first conducting state is set as an equivalent model of a resistance of 7.8Ω in series with an inductance of 30pH, corresponding to a binary phase control code of '1', and the second cut-off state is set as an equivalent model of an inductance of 30pH in series with a capacitance of 25fF, corresponding to a binary phase control code of '0'; then the simulation boundary conditions are set, periodic boundary conditions are applied in the X-axis and Y-axis directions of the unit to simulate an infinite array environment, a Floquet port is set in the Z-axis direction for excitation, the frequency scanning range is set to cover 8.8GHz to 12.1GHz, and the step size is set to 0.1GHz; then the simulation solver is started, and the frequency sweep calculation is performed on the physical models corresponding to the control codes '1' and '0' respectively, the S parameter complex data at each frequency sampling point is extracted, the simulation gain data (i.e. the reflection loss) is obtained by calculating the amplitude of the S parameter, and the basic phase spectrum is obtained by calculating the phase angle of the S parameter, so as to obtain two complete frequency domain response data sets; finally, a structured data table with frequency and control code as joint indexes is constructed, the phase value and gain value calculated above are filled in as key values in the corresponding index positions, and the packaging of the broadband frequency response database is completed, which can provide high-precision physical layer data support for subsequent error calculation and beam synthesis.

[0096] The application also provides a broadband dual-polarized unit-based reflectarray antenna control system, which is used to execute the broadband dual-polarized unit-based reflectarray antenna control method and comprises:

[0097] An array antenna surface composed of a plurality of broadband dual-polarized units arranged periodically;

[0098] A control module electrically connected to each broadband dual-polarized unit in the array antenna surface and used to execute the broadband dual-polarized unit-based reflectarray antenna control method.

[0099] Specifically, in the embodiment of the present application, the broadband dual-polarized unit comprises: a dielectric layer 1, which comprises a top dielectric layer 101, a middle dielectric layer 102 and a bottom dielectric layer 103 arranged in sequence; the upper end of the top dielectric layer 101 is provided with a radiation layer 2, which comprises a dipole group 201, a ground patch 202 and a switch assembly 203; the number of the dipole group 201 is two groups, two dipoles 201a in the same group are oppositely arranged, and four dipoles 201a of two pairs of dipole groups 201 are orthogonally arranged; the ground patch 202 is arranged between two dipoles 201a of the dipole group 201 and is connected with the dipole 201a through the switch assembly 203; a ground metal layer 301 is arranged between the top dielectric layer 101 and the middle dielectric layer 102, a choke metal layer 302 is arranged between the middle dielectric layer 102 and the bottom dielectric layer 103, and a bias metal layer 303 is arranged on the lower surface of the bottom dielectric layer 103; wherein the ground patch 202 passes through the top dielectric layer 101 downward and is connected with the ground metal layer 301; the dipole 201a passes through the ground metal layer 301 through a metalized via hole 4 and is insulated from the ground metal layer 301, and the dipole 201a is electrically connected to the choke metal layer 302 and the bias metal layer 303 downward.

[0100] From the above, the embodiment of the present application relates to a kind of based on the control method of wideband dual-polarized unit reflection array antenna, it can overcome the shortcomings of traditional reflection array antenna polarization component coupling serious, low in wideband range phase matching degree and the inaccuracy of phase control code acquisition, significantly enhance the independent pointing accuracy of dual-polarized beam and the stability of full-band gain, to realize the flexible reconstruction of beam in polarization and frequency dimension.The method based on the wideband dual-polarized unit reflection array antenna includes: S1 obtains target beam pointing instruction, and the target beam pointing instruction is decomposed into first polarization control vector and second polarization control vector, the first polarization control vector and second polarization control vector are orthogonal to each other;S2 according to the first polarization control vector and the second polarization control vector, calculate the theoretical phase spectrum of each wideband dual-polarized unit;S3 according to the preset wideband frequency response database, extract the basic phase spectrum of the wideband dual-polarized unit;S4 calculate the matching error between the theoretical phase spectrum of each wideband dual-polarized unit and the basic phase spectrum, and the theoretical phase spectrum is quantized mapping based on the matching error, obtain phase control code, the phase control code includes first polarization phase control code and second polarization phase control code;Wherein, the wideband dual-polarized unit has 2 groups of orthogonal setting dipole group, and the physical working state of the dipole group includes first conduction state and second cut-off state;The phase control code is used to drive the physical working state of the dipole group to switch to the physical working state corresponding to the phase control code.Wherein, by acquiring the target beam pointing instruction and decomposing the target beam pointing instruction into mutually orthogonal first polarization control vector and second polarization control vector, the vector orthogonal decomposition mechanism breaks the logical barrier of mutual restraint of components in the prior art double polarization beam regulation, establishes an independent decoupling framework of polarization dimension, and effectively solves the problem of serious polarization component coupling in the traditional reflective array antenna beam regulation process;Secondly, by calculating the theoretical phase spectrum of each wideband double polarization unit according to the polarization control vector, and combining the preset database to extract the basic phase spectrum, a global comparison system of full-band spectrum and basic response is established at the frequency domain layer, which provides a continuous observation window for the phase consistency in the wideband range, prevents the performance deterioration at the band edge caused by relying only on single frequency point phase design, and significantly enhances the phase matching degree in the wideband range;The mechanism of calculating the matching error between the theoretical phase spectrum and the basic phase spectrum and quantitatively mapping based on the matching error realizes the accurate alignment of the theoretical beam requirement and the physical unit state, ensures that the finally obtained phase control code can drive the wideband double polarization unit to switch to the physical working state with the minimum error, avoids the mapping distortion caused by the lack of error optimization in the traditional scheme, and greatly improves the accuracy of the phase control code acquisition;Compared with the prior art, the present application can overcome the shortcomings of serious polarization component coupling of traditional reflective array antenna, low phase matching degree in wideband range and inaccurate phase control code acquisition, significantly enhance the independent pointing accuracy of double polarization beam and the stability of full-band gain, and realize the flexible reconstruction of beam in polarization and frequency dimension.

[0101] The above description of disclosed embodiments enables one of ordinary skill in the art to make or use the application. Various modifications to these embodiments will be readily apparent to those of ordinary skill 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. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for controlling a broadband dual-polarized element based reflective array antenna, characterized in that, The method comprises the following steps: S1: obtaining a target beam pointing instruction and decomposing the target beam pointing instruction into a first polarization control vector and a second polarization control vector, the first polarization control vector and the second polarization control vector being orthogonal to each other; S2: calculating a theoretical phase spectrum of each wideband dual-polarized unit according to the first polarization control vector and the second polarization control vector; S3: extracting a basic phase spectrum of the wideband dual-polarized unit according to a preset wideband frequency response database; S4: calculating a matching error between the theoretical phase spectrum and the basic phase spectrum of each wideband dual-polarized unit, and quantitatively mapping the theoretical phase spectrum based on the matching error to obtain a phase control code, the phase control code comprising a first polarization phase control code and a second polarization phase control code; The calculation of the matching error comprises: obtaining a working frequency range of the wideband dual-polarized unit, discretely processing the working frequency range to obtain a plurality of frequency sampling points; respectively obtaining a theoretical compensation phase and a physical phase response of each frequency sampling point, and calculating an original phase difference between the theoretical compensation phase and the physical phase response at each frequency sampling point; based on each frequency sampling point, weighting the absolute value of the original phase difference to obtain a weighted phase error component; adding up the weighted phase error components corresponding to each frequency sampling point to obtain a matching error; The decomposition of the target beam pointing instruction into the first polarization control vector and the second polarization control vector comprises: obtaining a first polarization direction corresponding to a first polarization port of the wideband dual-polarized unit and a second polarization direction corresponding to a second polarization port; orthogonally projecting a target electric field vector corresponding to the target beam pointing instruction to the first polarization direction and the second polarization direction to obtain a first polarization control vector projected on the first polarization direction and a second polarization control vector projected on the second polarization direction; The wideband dual-polarized unit has two groups of orthogonally arranged dipole groups, and the physical working state of the dipole groups includes a first conduction state and a second cutoff state; The phase control code is used to drive the physical working state of the dipole groups to switch to a physical working state corresponding to the phase control code; The reflective array antenna executing the control method comprises: an array antenna surface composed of a plurality of wideband dual-polarized units arranged periodically; a control module electrically connected to each wideband dual-polarized unit in the array antenna surface and used for executing the control method based on the wideband dual-polarized unit; The wideband dual-polarized unit comprises: a dielectric layer (1) comprising a top dielectric layer (101), a middle dielectric layer (102) and a bottom dielectric layer (103) arranged in sequence; an upper end of the top dielectric layer (101) is provided with a radiation layer (2), and the radiation layer (2) comprises a dipole group (201), a ground patch (202) and a switch assembly (203); The number of the dipole groups (201) is 2 groups, two dipoles (201a) in the same group are oppositely arranged, and four dipoles (201a) in two dipole groups (201) are orthogonally arranged; The ground patch (202) is arranged between two dipoles (201a) of the dipole group (201) and is connected with the dipole (201a) through the switch assembly (203); The ground metal layer (301) is arranged between the top dielectric layer (101) and the middle dielectric layer (102), the choke metal layer (302) is arranged between the middle dielectric layer (102) and the bottom dielectric layer (103), and the bias metal layer (303) is arranged on the lower surface of the bottom dielectric layer (103); The ground patch (202) is connected with the ground metal layer (301) by penetrating the top dielectric layer (101) downward; The dipole (201a) penetrates the ground metal layer (301) through the metalized via (4) and is insulated from the ground metal layer (301), and the dipole (201a) is electrically connected to the choke metal layer (302) and the bias metal layer (303) downward.

2. The wideband dual-polarized element based reflectarray control method of claim 1, wherein, The step of weighting the absolute value of the original phase difference comprises: Obtaining the center frequency of the working frequency band, and calculating the frequency deviation absolute value of each frequency sampling point and the center frequency value; According to the preset attenuation function, the frequency deviation absolute value is mapped to obtain the frequency weighting coefficient corresponding to each frequency sampling point; The absolute value of the original phase difference is multiplied by the corresponding frequency weighting coefficient to obtain the weighted phase error component.

3. The wideband dual-polarized element based reflectarray control method of claim 2, wherein, The construction step of the attenuation function comprises: Calling the wideband frequency response database, extracting the simulation gain data of the wideband dual-polarized unit in the working frequency band, and constructing a gain frequency characteristic curve according to the simulation gain data; Extracting the maximum gain value of the gain frequency characteristic curve at the center frequency, and performing normalization processing on the gain frequency characteristic curve according to the maximum gain value to obtain a normalized gain distribution; The normalized gain distribution is fitted by a function to obtain an attenuation function.

4. The wideband dual-polarized element based reflectarray control method of claim 1, wherein, The step of quantitatively mapping the theoretical phase spectrum based on the matching error to obtain a phase control code comprises: According to the wideband frequency response database, a first basic phase spectrum in a first on state and a second basic phase spectrum in a second off state are obtained; The first matching error of the theoretical phase spectrum and the first basic phase spectrum, and the second matching error of the theoretical phase spectrum and the second basic phase spectrum are calculated respectively; The first matching error and the second matching error are compared, if the first matching error is less than the second matching error, the control code of the first basic phase spectrum is determined as the phase control code; If the first matching error is greater than the second matching error, the control code of the second basic phase spectrum is determined as the phase control code.

5. The wideband dual-polarized element based reflectarray control method of claim 1, wherein, The step of calculating the theoretical phase spectrum of each wideband dual-polarized unit comprises: A spatial coordinate system of the reflectarray antenna is established, and spatial position coordinates of each of the broadband dual-polarized units in the spatial coordinate system are obtained; A wave vector of a target beam is determined according to the target beam pointing instruction, and a spatial wave path difference between the wave vector and each of the spatial position coordinates is calculated; The spatial wave path difference is converted into a phase delay based on frequency sampling points, and phase delays of each of the frequency sampling points are combined to generate a theoretical phase spectrum.

6. The wideband dual-polarized element based reflectarray control method of claim 1, wherein, The establishing step of the broadband frequency response database comprises: The broadband dual-polarized units are respectively configured into a first conductive state and a second cut-off state, and a first phase control code corresponding to the first conductive state and a second phase control code corresponding to the second cut-off state are established; Electromagnetic simulation is performed on the broadband dual-polarized units, and basic phase spectrums and simulation gain data of the broadband dual-polarized units in the first conductive state and the second cut-off state are respectively obtained; A mapping index relationship between the basic phase spectrums, the simulation gain data and the phase control codes is established, and a broadband frequency response database is constructed based on the mapping index relationship.

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