Control method, device and system of reconfigurable metasurface

Abstract

The present application provides a control method, device and system for a reconfigurable metasurface, and relates to the technical field of reconfigurable metasurfaces. The method comprises: obtaining an incident beam direction and an outgoing beam direction respectively corresponding to each surface unit; determining a target phase respectively corresponding to each surface unit according to the incident beam direction and the outgoing beam direction; determining a reference surface unit row and a reference surface unit column respectively from a plurality of surface unit rows and a plurality of surface unit columns; determining a plurality of first control signals according to the target phase respectively corresponding to each surface unit of the reference surface unit row, and determining a plurality of second control signals according to the target phase respectively corresponding to each surface unit of the reference surface unit column; and controlling each surface unit to perform phase flipping according to the plurality of first control signals and the plurality of second control signals. In this way, the number of control channels can be reduced, the use of digital-to-analog converters and control chips can be reduced, the control system structure can be simplified, and the cost can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of reconfigurable metasurfaces, and in particular to a control method, device and system for a reconfigurable metasurface. Background Art

[0002] Reconfigurable metasurfaces are artificial electromagnetic surfaces with programmable electromagnetic properties that can be used to increase communication rates and realize broadband multifunctionality of electromagnetic devices. Reconfigurable metasurfaces have a large number of subwavelength resonant units, each of which has independent electromagnetic wave control capabilities and can accurately adjust the phase, amplitude, polarization and other parameters of electromagnetic signals.

[0003] However, as wireless network communications gradually develop towards millimeter wave and terahertz frequency bands, the size of metasurface units gradually shrinks and the number of units continues to increase, resulting in the need for metasurface control systems to use a large number of digital-to-analog converters and control chips, which increases costs. Summary of the invention

[0004] In order to at least overcome the above-mentioned deficiencies in the prior art, the purpose of the present application is to provide a control method, device and system for a reconfigurable metasurface.

[0005] In a first aspect, an embodiment of the present application provides a control method for a reconfigurable metasurface, wherein the reconfigurable metasurface includes a plurality of surface units, wherein the plurality of surface units are arranged into a plurality of surface unit rows and a plurality of surface unit columns;

[0006] In the same surface unit column, each surface unit is connected to the same first control line; in the same surface unit row, each surface unit is connected to the same second control line;

[0007] The method comprises:

[0008] Obtaining the incident beam direction and the outgoing beam direction corresponding to each of the surface units;

[0009] Determine the target phase corresponding to each of the surface units respectively according to the incident beam direction and the outgoing beam direction;

[0010] Determine one of the surface unit rows and one of the surface unit columns as a reference surface unit row and one of the surface unit columns as a reference surface unit column, respectively;

[0011] Determine a plurality of first control signals corresponding to a plurality of the surface unit columns according to the target phases corresponding to the surface units of the reference surface unit row, and determine a plurality of second control signals corresponding to the plurality of the surface unit rows according to the target phases corresponding to the surface units of the reference surface unit column;

[0012] Each of the surface units is controlled to perform phase flipping according to a plurality of the first control signals and a plurality of the second control signals.

[0013] In a possible implementation, the step of determining a plurality of first control signals corresponding to a plurality of surface unit columns respectively according to a target phase respectively corresponding to each of the surface units of the reference surface unit row, and determining a plurality of second control signals corresponding to a plurality of surface unit rows respectively according to a target phase respectively corresponding to each of the surface units of the reference surface unit column, comprises:

[0014] Determine a plurality of first target voltages according to target phases respectively corresponding to the surface units of the reference surface unit row, and determine a plurality of second target voltages according to target phases respectively corresponding to the surface units of the reference surface unit column;

[0015] A plurality of first control signals respectively corresponding to a plurality of the surface unit columns and a plurality of second control signals respectively corresponding to a plurality of the surface unit rows are calculated according to a plurality of the first target voltages and a plurality of the second target voltages.

[0016] In a possible implementation, the step of respectively calculating a plurality of first control signals corresponding to a plurality of surface unit columns and a plurality of second control signals corresponding to a plurality of surface unit rows according to a plurality of the first target voltages and a plurality of the second target voltages includes:

[0017] Get the phase reference level;

[0018] Calculate a plurality of first control signals respectively corresponding to a plurality of the surface unit columns according to the phase reference level and a plurality of the first target voltages;

[0019] A plurality of second control signals respectively corresponding to a plurality of the surface unit rows are calculated according to the phase reference level and a plurality of the second target voltages.

[0020] In a possible implementation, the first control signal It is calculated by:

[0021]

[0022] The second control signal It is calculated by:

[0023]

[0024] in, Indicates the row number corresponding to the position of the surface unit in the reconfigurable hypersurface; Indicates the number of columns corresponding to the position of the surface unit in the reconfigurable metasurface; A row number representing the position of the reference surface unit row in the reconfigurable metasurface; represents the column number of the reference surface unit column; Indicates the phase reference level; represents a first target voltage; represents the second target voltage.

[0025] In a possible implementation, the step of determining a plurality of first target voltages according to target phases respectively corresponding to the surface units of the reference surface unit row, and determining a plurality of second target voltages according to target phases respectively corresponding to the surface units of the reference surface unit column, comprises:

[0026] Get voltage phase curve;

[0027] Based on the voltage phase curve, multiple first target voltages are determined according to the target phases corresponding to each surface unit in the reference surface unit row, and based on the voltage phase curve, multiple second target voltages are determined according to the target phases corresponding to each surface unit in the reference surface unit column.

[0028] In a possible implementation, each of the surface units corresponds to a target phase It is calculated by:

[0029]

[0030] in, represents the wave number, ; Indicates the row number corresponding to the position of the surface unit in the reconfigurable hypersurface; Indicates the number of columns corresponding to the position of the surface unit in the reconfigurable metasurface; represents the spacing between adjacent surface units in the same surface unit row; represents the spacing between adjacent surface units in the same column of surface units; Indicates the outgoing beam direction; Indicates the incident beam direction.

[0031] In a possible implementation, the step of determining, from the plurality of surface unit rows and the plurality of surface unit columns, one surface unit row as a reference surface unit row and one surface unit column as a reference surface unit column, respectively, comprises:

[0032] Calculating respectively the first phase difference between the adjacent surface units in each surface unit row and the second phase difference between the adjacent surface units in each surface unit column according to the target phase corresponding to each surface unit;

[0033] According to the first phase difference and the second phase difference, one surface unit row is determined as a reference surface unit row and one surface unit column is determined as a reference surface unit column from among the plurality of surface unit rows and the plurality of surface unit columns.

[0034] In a possible implementation, a plurality of the first control signals are respectively loaded to the positive electrode of each of the surface units through a plurality of the first control lines; a plurality of the second control signals are respectively loaded to the negative electrode of each of the surface units through a plurality of the second control lines.

[0035] In a second aspect, an embodiment of the present application further provides a control device for a reconfigurable metasurface, comprising:

[0036] An acquisition module, used for acquiring the incident beam direction and the outgoing beam direction corresponding to each of the surface units;

[0037] A first determination module, configured to determine a target phase corresponding to each of the surface units according to the incident beam direction and the outgoing beam direction;

[0038] A second determining module is used to determine one of the surface unit rows and one of the surface unit columns as a reference surface unit row and a reference surface unit column respectively from the plurality of surface unit rows and the plurality of surface unit columns;

[0039] a third determining module, configured to calculate a plurality of first control signals corresponding to a plurality of first control lines according to a target phase corresponding to each of the surface units of the reference surface unit row, and to calculate a plurality of second control signals corresponding to a plurality of second control lines according to a target phase corresponding to each of the surface units of the reference surface unit column;

[0040] The control module is used to control each of the surface units to perform phase flipping according to a plurality of the first control signals and a plurality of the second control signals.

[0041] In a third aspect, an embodiment of the present application further provides a control system for a reconfigurable metasurface, wherein the control system for the reconfigurable metasurface comprises a processor and a machine-readable storage medium, wherein the machine-readable storage medium stores machine-executable instructions, and when the machine-executable instructions are executed by the processor, the methods described in any of the above aspects are implemented.

[0042] Based on any of the above aspects, the control method, device and system of the reconfigurable metasurface provided in the embodiments of the present application can realize phase flipping of each surface unit by calculating multiple first control signals corresponding to each surface unit column and multiple second control signals corresponding to each surface unit row, and each first control signal corresponds to a first control line, and each second control signal corresponds to a second control line. In this way, the number of control channels can be reduced, and the use of digital-to-analog converters and control chips can be reduced, thereby simplifying the control system structure and reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0044] Figure 1 A schematic structural diagram of a reconfigurable metasurface provided in an embodiment of the present application;

[0045] Figure 2 A schematic diagram of a flow chart of a control method for a reconfigurable metasurface provided in an embodiment of the present application;

[0046] Figure 3 A schematic diagram of sub-steps of step S400 provided in an embodiment of the present application;

[0047] Figure 4 One of the structural schematic diagrams of the surface unit provided in the embodiment of the present application;

[0048] Figure 5 A schematic diagram of sub-steps of step S420 provided in an embodiment of the present application;

[0049] Figure 6 A schematic diagram of sub-steps of step S410 provided in an embodiment of the present application;

[0050] Figure 7 A schematic diagram of a voltage phase curve provided in an embodiment of the present application;

[0051] Figure 8 A schematic diagram of sub-steps of step S300 provided in an embodiment of the present application;

[0052] Fig. 9 The second structural schematic diagram of the surface unit provided in the embodiment of the present application;

[0053] Fig.10 A schematic structural block diagram of a control system of a reconfigurable metasurface provided in an embodiment of the present application;

[0054] Fig.11 Schematic diagram of the functional modules of the control device of the reconfigurable metasurface provided in an embodiment of the present application.

[0055] Icon: 100 - surface unit; 800 - control system of reconfigurable metasurface; 810 - processor; 820 - machine-readable storage medium; 830 - control device of reconfigurable metasurface; 831 - acquisition module; 832 - first determination module; 833 - second determination module; 834 - third determination module; 835 - control module. DETAILED DESCRIPTION

[0056] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0057] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0058] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0059] In the description of this application, it should be noted that the terms "upper", "lower", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the application is usually placed when in use, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0060] It should be noted that, in the absence of conflict, different features in the embodiments of the present application may be combined with each other.

[0061] The inventors have discovered that, currently, in the process of programming and regulating the reconfigurable metasurface, usually one surface unit needs to be controlled through one control channel. If the reconfigurable metasurface has a large number of surface units, a corresponding number of control channels is required, which will lead to the use of a large number of digital-to-analog converters and control chips, thereby increasing costs.

[0062] This embodiment provides a solution that can solve the above-mentioned problem. The specific implementation methods of this application are described in detail below in conjunction with the accompanying drawings.

[0063] This embodiment provides a control method for a reconfigurable metasurface. Figure 1 The reconfigurable metasurface may include a plurality of surface units 100 distributed in an array, and the plurality of surface units 100 are arranged into a plurality of surface unit rows and a plurality of surface unit columns.

[0064] In the same surface unit column, each surface unit 100 is connected to the same first control line. In the same surface unit row, each surface unit 100 is connected to the same second control line.

[0065] In this embodiment, the surface units 100 in the same surface unit column are arranged along the first direction, and the surface units 100 in the same surface unit row are arranged along the second direction, and the first direction may be perpendicular to the second direction. If the number of the surface unit rows is m, and the number of the surface unit columns is n, then the number of the surface units 100 may be m×n, the number of the first control lines may be n, and the number of the second control lines may be m. The same first control line may be connected to the m surface units 100 in the same surface unit column, and the same second control line may be connected to the n surface units 100 in the same surface unit row, and the m×n surface units 100 may be controlled by m+n control lines.

[0066] Please refer to Figure 2 , Figure 2 A flowchart of a control method for a reconfigurable metasurface provided in this embodiment is provided as an example. The method may include the following steps.

[0067] Step S100 , obtaining the incident beam direction and the outgoing beam direction corresponding to each of the surface units 100 .

[0068] In this embodiment, while obtaining the incident beam direction and the outgoing beam direction corresponding to each surface unit 100, the spacing between adjacent surface units 100 in the same surface unit row and the spacing between adjacent surface units 100 in the same surface unit column can also be obtained.

[0069] Step S200 , determining the target phase corresponding to each of the surface units 100 according to the incident beam direction and the outgoing beam direction.

[0070] In this embodiment, the target phase corresponding to each surface unit 100 can be calculated based on the incident beam direction corresponding to each surface unit 100 obtained in step S100, the outgoing beam direction corresponding to each surface unit 100, the spacing between adjacent surface units 100 in the same surface unit row, and the spacing between adjacent surface units 100 in the same surface unit column.

[0071] Step S300 : determining one of the surface unit rows and one of the surface unit columns as a reference surface unit row and a reference surface unit column respectively from the plurality of surface unit rows and the plurality of surface unit columns.

[0072] In this embodiment, one surface unit row may be selected from a plurality of surface unit rows as the reference surface unit row, and one surface unit column may be selected from a plurality of surface unit columns as the reference surface unit column.

[0073] Exemplarily, the first surface unit row may be selected as the reference surface unit row, and the first surface unit column may be selected as the reference surface unit column.

[0074] Step S400, determining a plurality of first control signals corresponding to the plurality of surface unit columns respectively according to the target phases corresponding to the respective surface units 100 of the reference surface unit row, and determining a plurality of second control signals corresponding to the plurality of surface unit rows respectively according to the target phases corresponding to the respective surface units 100 of the reference surface unit column.

[0075] In this embodiment, the target phase corresponding to each surface unit 100 in the reference surface unit row and the target phase corresponding to each surface unit 100 in the reference surface unit column can be obtained according to the target phase corresponding to each surface unit 100 obtained in step S200, so as to calculate a plurality of first control signals corresponding to each surface unit column and a plurality of second control signals corresponding to each surface unit row.

[0076] Among them, one column of the surface unit may correspond to one first control signal, and one row of the surface unit may correspond to one second control signal.

[0077] Step S500 , controlling each of the surface units 100 to perform phase flipping according to the plurality of the first control signals and the plurality of the second control signals.

[0078] In this embodiment, the first control signal and the second control signal can be generated by an external control board, and the first control signal and the second control signal can be transmitted to each of the surface units 100 through the first control line and the second control line to achieve phase flipping, reconstruct the electromagnetic performance of each of the surface units 100, and realize beamforming such as two-dimensional beam scanning of the electromagnetic metasurface.

[0079] In the above design, by calculating multiple first control signals corresponding to each column of the surface units and multiple second control signals corresponding to each row of the surface units, phase flipping of each surface unit 100 can be achieved, and each first control signal corresponds to a first control line, and each second control signal corresponds to a second control line. In this way, the number of control channels can be reduced, and the use of digital-to-analog converters and control chips can be reduced, thereby simplifying the control system structure and reducing costs.

[0080] In one possible implementation, see Figure 3 , step S400 may include the following sub-steps.

[0081] Step S410 , determining a plurality of first target voltages according to target phases respectively corresponding to the surface units 100 of the reference surface unit row, and determining a plurality of second target voltages according to target phases respectively corresponding to the surface units 100 of the reference surface unit column.

[0082] In this embodiment, a plurality of first target voltages corresponding to each surface unit 100 of the reference surface unit row can be determined according to the target phase corresponding to each surface unit 100 of the reference surface unit row, and a plurality of second target voltages corresponding to each surface unit 100 of the reference surface unit column can be determined according to the target phase corresponding to each surface unit 100 of the reference surface unit column. Each surface unit 100 of the reference surface unit row can correspond to one first target voltage, and each surface unit 100 of the reference surface unit column can correspond to one second target voltage.

[0083] In step S420 , a plurality of first control signals corresponding to a plurality of surface unit columns and a plurality of second control signals corresponding to a plurality of surface unit rows are calculated according to a plurality of the first target voltages and a plurality of the second target voltages.

[0084] In this embodiment, the multiple first control signals corresponding to each surface unit column can be calculated respectively according to the multiple first target voltages corresponding to each surface unit 100 of the reference surface unit row obtained in step S410, and the multiple second control signals corresponding to each surface unit row can also be calculated respectively according to the multiple second target voltages corresponding to each surface unit 100 of the reference surface unit column obtained in step S410.

[0085] In one possible implementation, see Figure 4 , the surface unit 100 may include a first unit metal structure, a second unit metal structure, a reconfigurable element and a unit circuit. The first unit metal structure and the second unit metal structure may be respectively arranged on opposite sides of the reconfigurable element, and the unit circuit may be connected to the reconfigurable element through the first unit metal structure. Exemplarily, the reconfigurable element may be a varactor, and its working state may be a reverse bias state.

[0086] Please refer to Figure 5 , step S420 may include the following sub-steps.

[0087] Step S421, obtaining a phase reference level.

[0088] In this embodiment, the voltage phase curve can be determined based on the performance parameters of the reconfigurable element of the surface unit 100, the performance parameters of the first unit metal structure and the second unit metal structure, and the phase reference level can be determined based on the performance parameters of the reconfigurable element of the surface unit 100 and the maximum effective voltage value in the voltage phase curve.

[0089] Step S422 , calculating a plurality of first control signals corresponding to a plurality of the surface unit columns respectively according to the phase reference level and a plurality of the first target voltages.

[0090] In this embodiment, a plurality of first control signals corresponding to each of the surface unit columns may be calculated according to the phase reference level obtained in step S421 and the plurality of first target voltages obtained in step S410.

[0091] Step S423 , calculating a plurality of second control signals corresponding to a plurality of the surface unit rows respectively according to the phase reference level and a plurality of the second target voltages.

[0092] In this embodiment, a plurality of second control signals corresponding to each of the surface unit rows may be calculated according to the phase reference level obtained in step S421 and the plurality of second target voltages obtained in step S410.

[0093] In a possible implementation, the first control signal It can be calculated as follows:

[0094]

[0095] The second control signal It can be calculated as follows:

[0096]

[0097] in, Indicates the row number corresponding to the position of the surface unit 100 in the reconfigurable metasurface; represents the number of columns corresponding to the position of the surface unit 100 in the reconfigurable metasurface; A row number representing the position of the reference surface unit row in the reconfigurable metasurface; The column number representing the position of the reference surface unit column in the reconfigurable metasurface; Indicates the phase reference level; represents a first target voltage; represents the second target voltage.

[0098] In some examples, the first control signal corresponding to the second row of the surface units is It can be calculated as follows:

[0099]

[0100] If the reference surface unit column determined from the plurality of surface unit columns is the first surface unit column, then .

[0101] The second control signal corresponding to the second row of the surface units It can be calculated as follows:

[0102]

[0103] If the reference surface cell row determined from the plurality of surface cell rows is the first surface cell row, then .

[0104] In one possible implementation, see Figure 6 , step S410 may include the following sub-steps.

[0105] Step S411, obtaining a voltage phase curve.

[0106] In this embodiment, the voltage phase curve can be determined according to the performance parameters of the reconfigurable element of the surface unit 100, the performance parameters of the first unit metal structure and the second unit metal structure. Figure 7 , Figure 7 The schematic diagram of the voltage phase curve provided in this embodiment is illustrated, the abscissa of the voltage phase curve represents the operating frequency of the surface unit 100 , and the ordinate of the voltage phase curve represents the target phase of the surface unit 100 .

[0107] Step S412, determining a plurality of first target voltages based on the voltage phase curve according to the target phases respectively corresponding to the surface units 100 of the reference surface unit row, and determining a plurality of second target voltages based on the voltage phase curve according to the target phases respectively corresponding to the surface units 100 of the reference surface unit column.

[0108] In this embodiment, based on the voltage phase curve obtained in step S411, a plurality of first target voltages corresponding to each surface unit 100 in the reference surface unit row can be determined according to the target phase and operating frequency corresponding to each surface unit 100 in the reference surface unit row, and a plurality of second target voltages corresponding to each surface unit 100 in the reference surface unit column can be determined according to the target phase and operating frequency corresponding to each surface unit 100 in the reference surface unit column.

[0109] In a possible implementation, each of the surface units 100 corresponds to a target phase It can be calculated as follows:

[0110]

[0111] in, represents the wave number, ; Indicates the row number corresponding to the position of the surface unit 100 in the reconfigurable metasurface; represents the number of columns corresponding to the position of the surface unit 100 in the reconfigurable metasurface; represents the spacing between adjacent surface units 100 in the same surface unit row; represents the spacing between adjacent surface units 100 in the same surface unit column; Indicates the outgoing beam direction; Indicates the incident beam direction.

[0112] In one possible implementation, see Figure 8 , step S300 may include the following sub-steps.

[0113] Step S310 , calculating a first phase difference between adjacent surface units 100 in each surface unit row and a second phase difference between adjacent surface units 100 in each surface unit column according to a target phase corresponding to each surface unit 100 .

[0114] In this embodiment, the first phase difference between adjacent surface units 100 in each surface unit row and the second phase difference between adjacent surface units 100 in each surface unit column can be calculated respectively according to the target phase corresponding to each surface unit 100 obtained in step S200.

[0115] Specifically, the phases corresponding to two adjacent surface units 100 in the same surface unit row may be subtracted to obtain a plurality of first phase differences corresponding to the surface unit row. The phases corresponding to two adjacent surface units 100 in the same surface unit column may be subtracted to obtain a plurality of second phase differences corresponding to the surface unit column.

[0116] Step S320 , determining one surface unit row as a reference surface unit row and one surface unit column as a reference surface unit column from the plurality of surface unit rows and the plurality of surface unit columns respectively according to the first phase difference and the second phase difference.

[0117] In this embodiment, the deviations between the first phase differences corresponding to each of the surface unit rows may be calculated first, and a surface unit row with the smallest deviation between the first phase differences may be selected from the surface unit rows as the reference surface unit row. At the same time, the deviations between the second phase differences corresponding to each of the surface unit columns may be calculated first, and a surface unit column with the smallest deviation between the second phase differences may be selected from the surface unit columns as the reference surface unit column.

[0118] If there is a surface unit row corresponding to a plurality of the first phase differences that are equal, the surface unit row may be selected as the reference surface unit row.

[0119] In a possible implementation, a plurality of the first control signals are respectively loaded to the positive electrode of each of the surface units 100 through a plurality of the first control lines, and a plurality of the second control signals are respectively loaded to the negative electrode of each of the surface units 100 through a plurality of the second control lines.

[0120] In this embodiment, multiple first control signals can be loaded to the positive electrode of the reconfigurable element in each surface unit 100 through multiple first control lines, and multiple second control signals can be loaded to the negative electrode of the reconfigurable element after being processed by the unit circuit of the surface unit 100 through multiple second control lines.

[0121] The voltage difference between the negative electrode and the positive electrode of the reconfigurable element in each surface unit 100 can be expressed as ,in, Indicates the first control signal corresponding to the surface unit column of the column, represents the second control signal corresponding to the surface unit row of the i-th row, represents the unit circuit response function, , Indicates the phase reference level.

[0122] For details, please refer to Fig. 9 , the first control signal can be directly connected to the positive electrode of the reconfigurable element, the second control signal The surface unit 100 can be processed by the unit circuit and then loaded to the negative electrode of the reconfigurable element. In the unit circuit, the resistance values ​​of resistors R1, R2, R3, R4, R5, R6, R7 and R8 are equal, and the resistance values ​​of resistors R9, R10, R11 and R12 are equal. When the voltage difference between the negative electrode and the positive electrode of the surface unit 100 is When the voltage comparator in the unit circuit outputs a low level, transistor Q1 is in the cut-off state, transistor Q2 is in the on state, and the second control signal It can be loaded to the negative electrode of the reconfigurable element through the resistor R12 and the diode D2. Therefore, the voltage difference loaded between the negative electrode and the positive electrode of the reconfigurable element can be When the voltage difference between the negative and positive terminals of the surface unit 100 is When the voltage comparator in the unit circuit outputs a high level, transistor Q1 is in the on state, transistor Q2 is in the off state, and the second control signal With the phase reference level The voltage difference between the negative and positive electrodes of the reconfigurable element can be respectively loaded on the in-phase input terminal and the inverting input terminal of the operational amplifier to form a subtraction circuit. .

[0123] This embodiment also provides a control system for a reconfigurable metasurface. Fig.10A block diagram of a control system 800 of the reconfigurable metasurface is shown as an example. The control system of the reconfigurable metasurface includes a processor 810, a machine-readable storage medium 820, and a control device 830 of the reconfigurable metasurface. The machine-readable storage medium 820 and the processor 810 are electrically connected to each other directly or indirectly to realize data transmission or interaction. For example, these elements can be electrically connected to each other through one or more communication buses or signal lines. The control device 830 of the reconfigurable metasurface includes a plurality of software function modules that can be stored in the machine-readable storage medium 820 in the form of software or firmware or solidified in the operating system (OS) of the control device 830 of the reconfigurable metasurface. The processor 810 is used to execute executable modules stored in the machine-readable storage medium 820, such as software function modules and computer programs included in the control device 830 of the reconfigurable metasurface.

[0124] The machine-readable storage medium 820 may be, but is not limited to, a random access memory (RAM), a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable read-only memory (EEPROM), etc. The machine-readable storage medium 820 is used to store a program, and the processor 810 executes the program after receiving an execution instruction.

[0125] The processor 810 may be an integrated circuit chip with signal processing capabilities. The above-mentioned processor 810 may be a general-purpose processor 810, including a central processing unit 810 (CPU), a network processor 810 (NP), etc.; it may also be a digital signal processor 810 (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The various methods, steps and logic block diagrams disclosed in the embodiments of the present application can be implemented or executed. The general-purpose processor 810 may be a microprocessor 810 or the processor 810 may also be any conventional processor 810, etc.

[0126] Please refer to Fig.11 The embodiment of the present application further provides a control device 830 for a reconfigurable metasurface, and the control device 830 for a reconfigurable metasurface includes a plurality of functional modules that can be stored in a machine-readable storage medium 820 in the form of software. Functionally, the control device 830 for a reconfigurable metasurface may include an acquisition module 831, a first determination module 832, a second determination module 833, a third determination module 834, and a control module 835. Among them:

[0127] The acquisition module 831 may be used to acquire the incident beam direction and the outgoing beam direction corresponding to each of the surface units 100 .

[0128] In this embodiment, the acquisition module 831 can be used to execute Figure 2 As shown in step S100, for the specific description of the acquisition module 831, reference may be made to the description of the step S100.

[0129] The first determination module 832 may be configured to determine the target phase corresponding to each of the surface units 100 according to the incident beam direction and the outgoing beam direction.

[0130] In this embodiment, the first determining module 832 may be used to execute Figure 2 As shown in step S200, for the detailed description of the first determining module 832, reference may be made to the description of the step S200.

[0131] The second determination module 833 may be configured to determine, from the plurality of surface unit rows and the plurality of surface unit columns, one surface unit row as a reference surface unit row and one surface unit column as a reference surface unit column, respectively.

[0132] In this embodiment, the second determining module 833 may be used to execute Figure 2 As shown in step S300, for the detailed description of the second determining module 833, reference may be made to the description of the step S300.

[0133] The third determination module 834 can be used to calculate multiple first control signals corresponding to multiple first control lines according to the target phases corresponding to each of the surface units 100 in the reference surface unit row, and to calculate multiple second control signals corresponding to multiple second control lines according to the target phases corresponding to each of the surface units 100 in the reference surface unit column.

[0134] In this embodiment, the third determination module 834 may be used to perform Figure 2 As shown in step S400, for the detailed description of the third determination module 834, reference may be made to the description of step S400.

[0135] The control module 835 can be used to control each of the surface units 100 to perform phase flipping according to a plurality of the first control signals and a plurality of the second control signals.

[0136] In this embodiment, the control module 835 can be used to execute Figure 2 As shown in step S500, for the detailed description of the control module 835, reference may be made to the description of the step S500.

[0137] In summary, the embodiments of the present application provide a control method, device and system for a reconfigurable metasurface. By calculating multiple first control signals corresponding to each surface unit column and multiple second control signals corresponding to each surface unit row, phase flipping of each surface unit can be achieved, and each first control signal corresponds to a first control line, and each second control signal corresponds to a second control line. In this way, the number of control channels can be reduced, and the use of digital-to-analog converters and control chips can be reduced, thereby simplifying the control system structure and reducing costs.

[0138] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0139] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A control method for a reconfigurable metasurface, characterized in that: The reconfigurable metasurface includes a plurality of surface units, and the plurality of surface units are arranged into a plurality of surface unit rows and a plurality of surface unit columns; In the same surface unit column, each surface unit is connected to the same first control line; in the same surface unit row, each surface unit is connected to the same second control line; The method comprises the following steps: Step S100: obtaining the incident beam direction and the outgoing beam direction corresponding to each of the surface units; Step S200: determining the target phase corresponding to each of the surface units respectively according to the incident beam direction and the outgoing beam direction; Step S300: determining one of the surface unit rows and one of the surface unit columns as a reference surface unit row and one of the surface unit columns as a reference surface unit column, respectively; Step S400: determining a plurality of first control signals corresponding to a plurality of surface unit columns respectively according to target phases corresponding to each of the surface units of the reference surface unit row, and determining a plurality of second control signals corresponding to a plurality of surface unit rows respectively according to target phases corresponding to each of the surface units of the reference surface unit column; Step 500: Control each of the surface units to perform phase flipping according to a plurality of the first control signals and a plurality of the second control signals; The step S400 includes the following steps: Step S410: determining a plurality of first target voltages according to target phases respectively corresponding to the surface units of the reference surface unit row, and determining a plurality of second target voltages according to target phases respectively corresponding to the surface units of the reference surface unit column; Step S420: calculating a plurality of first control signals corresponding to a plurality of the surface unit columns and a plurality of second control signals corresponding to a plurality of the surface unit rows according to a plurality of the first target voltages and a plurality of the second target voltages; The first control signal It is calculated by: The second control signal It is calculated by: in, Indicates the row number corresponding to the position of the surface unit in the reconfigurable hypersurface; Indicates the number of columns corresponding to the position of the surface unit in the reconfigurable metasurface; A row number representing the position of the reference surface unit row in the reconfigurable metasurface; represents the column number of the reference surface unit column; Indicates the phase reference level; represents a first target voltage; represents a second target voltage; The voltage difference between the negative electrode and the positive electrode of the reconfigurable element in each surface unit can be expressed as , in, Indicates the first control signal corresponding to the surface unit column of the column, Indicates the second control signal corresponding to the row of the surface units of the row, represents the unit circuit response function, 。 2. The control method of the reconfigurable metasurface according to claim 1, characterized in that: The step S420 includes the following steps: Step S421: obtaining a phase reference level; Step S422: calculating a plurality of first control signals respectively corresponding to a plurality of the surface unit columns according to the phase reference level and a plurality of the first target voltages; Step S423: Calculating a plurality of second control signals corresponding to a plurality of the surface unit rows respectively according to the phase reference level and a plurality of the second target voltages.

3. The control method of the reconfigurable metasurface according to claim 1, characterized in that: The step S410 includes the following steps: Step S411: obtaining a voltage phase curve; Step S412: Determine a plurality of first target voltages according to the target phases respectively corresponding to the surface units of the reference surface unit row based on the voltage phase curve, and determine a plurality of second target voltages according to the target phases respectively corresponding to the surface units of the reference surface unit column based on the voltage phase curve.

4. The control method of the reconfigurable metasurface according to claim 1, characterized in that: Each of the surface units corresponds to a target phase It is calculated by: in, represents the wave number, ； represents the spacing between adjacent surface units in the same surface unit row; represents the spacing between adjacent surface units in the same column of surface units; Indicates the outgoing beam direction; Indicates the incident beam direction.

5. The control method of the reconfigurable metasurface according to claim 1, characterized in that: The step S300 includes the following steps: Step S310: calculating the first phase difference between adjacent surface units in each surface unit row and the second phase difference between adjacent surface units in each surface unit column according to the target phase corresponding to each surface unit; Step S320: Determine one surface unit row as a reference surface unit row and one surface unit column as a reference surface unit column from the plurality of surface unit rows and the plurality of surface unit columns respectively according to the first phase difference and the second phase difference.

6. The control method of the reconfigurable metasurface according to claim 1, characterized in that: A plurality of the first control signals are respectively loaded to the positive electrode of each of the surface units through a plurality of the first control lines; a plurality of the second control signals are respectively loaded to the negative electrode of each of the surface units through a plurality of the second control lines.

7. A control device for a reconfigurable metasurface, based on the control method for a reconfigurable metasurface according to any one of claims 1 to 6, characterized in that: include: An acquisition module, used for acquiring the incident beam direction and the outgoing beam direction corresponding to each of the surface units; A first determination module, configured to determine a target phase corresponding to each of the surface units according to the incident beam direction and the outgoing beam direction; A second determining module is used to determine one of the surface unit rows and one of the surface unit columns as a reference surface unit row and a reference surface unit column respectively from the plurality of surface unit rows and the plurality of surface unit columns; a third determining module, configured to calculate a plurality of first control signals corresponding to a plurality of first control lines respectively according to target phases respectively corresponding to the surface units of the reference surface unit row, and to calculate a plurality of second control signals corresponding to a plurality of second control lines respectively according to target phases respectively corresponding to the surface units of the reference surface unit column; The control module is used to control each of the surface units to perform phase flipping according to a plurality of the first control signals and a plurality of the second control signals.

8. A control system for a reconfigurable metasurface, characterized in that: The control system of the reconfigurable metasurface includes a processor and a machine-readable storage medium, wherein the machine-readable storage medium stores machine-executable instructions, and when the machine-executable instructions are executed by the processor, the method described in any one of claims 1 to 6 is implemented.

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