Rapid design method, device, equipment and medium for transmissive metasurface

Abstract

The present invention provides a rapid design method, device, equipment, and medium for a transmissive metasurface, including: establishing an initial model of the transmissive metasurface, including a dielectric layer and a circular metal patch located on the dielectric layer; obtaining multi-port impedance parameters of the initial model of the transmissive metasurface; constructing an equivalent multi-port network model of the initial model of the transmissive metasurface based on the multi-port impedance parameters, and establishing a relationship between the voltage and current of the multi-port network model; obtaining the impedance parameters of the internal ports and the scattering coefficients of the external ports based on the relationship between the voltage and current of the multi-port network model; and constructing an optimization objective function to optimize the performance of the initial model of the transmissive metasurface, thereby maximizing the bidirectional transmission efficiency and obtaining the transmissive metasurface. The present invention combines physical modeling and electromagnetic simulation to achieve rapid design and performance optimization of transmissive metasurface structures.

Description

Technical Field

[0001] The present invention relates to the field of electromagnetic metasurface technology, and in particular to a rapid design method, device, equipment and medium for a transmission metasurface. Background Art

[0002] Transmissive metasurfaces are a new type of device based on artificial electromagnetic structures that can precisely control the transmission properties of electromagnetic waves, offering significant application value in a wide range of fields. In communications, transmissive metasurfaces can be used to design high-performance antennas, improving signal coverage and transmission efficiency, particularly in 5G / 6G communications. In radar systems, transmissive metasurfaces can achieve beamforming and sidelobe suppression, improving target detection accuracy. Furthermore, transmissive metasurfaces can be used in stealth technology, reducing the radar cross section (RCS) of a target by manipulating the transmission and reflection properties of electromagnetic waves. In optics, transmissive metasurfaces can be used in the design of superlenses, breaking through the diffraction limit of traditional optical devices and achieving high-resolution imaging. In summary, transmissive metasurfaces, with their flexible design and powerful electromagnetic control capabilities, offer broad application prospects in communications, radar, stealth, and optics.

[0003] Traditional transmissive metasurface design relies heavily on electromagnetic simulation. Each parameter adjustment requires re-simulation to obtain S-parameters, resulting in hundreds or even thousands of simulations during the design process, which is extremely time-consuming. Especially in multi-band metasurface design, the number of simulations required for parameter scanning and optimization increases further, significantly limiting the efficiency of metasurface hardware updates and optimization. However, methods that use machine learning to establish alternative models to replace computationally expensive electromagnetic simulation models for intelligent metasurface design optimization cannot eliminate the reliance on electromagnetic simulation during the design process, as machine learning requires the use of electromagnetic simulation samples for modeling.

[0004] Therefore, how to solve the time-consuming problem of electromagnetic simulation of metasurface structures while taking into account the practical factors of rapid design of multi-band transmission metasurfaces has become an urgent problem to be solved. Summary of the Invention

[0005] In response to the defects of the existing technology, the present invention provides a rapid design method, device, equipment and medium for transmissive metasurfaces.

[0006] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] In one aspect, the present invention provides a rapid design method for a transmissive metasurface, comprising the following steps:

[0008] S1. Establish an initial model of a transmissive metasurface, including a dielectric layer and circular metal patches located on the dielectric layer. The circular metal patches are arranged in a circular shape with the center of the dielectric layer as the center point. The spacing between each circular metal patch is equal, and the circular metal patches in the same circular ring have the same size.

[0009] S2. Obtaining multi-port impedance parameters of the initial model of the transmissive metasurface;

[0010] S3. Construct an equivalent multi-port network model of the initial model of the transmissive metasurface based on the multi-port impedance parameters, and establish the relationship between the voltage and current of the multi-port network model:

[0011] ;

[0012] ;

[0013] in, is the equivalent voltage of the external port; is the equivalent current of the external port; is the voltage of the internal port; is the current of the internal port; is the matrix expression of multi-port impedance parameters, for q The self-impedance between the external ports, for q External ports and N The mutual impedance between the internal ports, for N Internal ports and q The mutual impedance between the external ports, for N Mutual impedance between internal ports;

[0014] S4. Obtain the impedance parameters of the internal ports based on the relationship between the voltage and current of the multi-port network model and the scattering coefficient of the external port :

[0015] ;

[0016] in, is the free space impedance, q × q The diagonal matrix of which the diagonal elements are the free space electromagnetic wave impedance; For the i The external port transmits to the j The signal of the external port is i The ratio of the incident signals of the external ports;

[0017] S5. Construct an optimization objective function to optimize the performance of the initial model of the transmissive metasurface, maximize the bidirectional transmission efficiency, and obtain the transmissive metasurface.

[0018] Furthermore, the dielectric layer is composed of a dielectric substrate, which is a square with a length of 7.75 mm, a thickness of 0.1 mm, a dielectric constant of 2.98, and a dielectric loss tangent of 0.002.

[0019] Furthermore, when the number of rings in the initial model of the transmission metasurface is one and a single-band transmission metasurface initial model is formed, the optimization objective function in S5 is:

[0020] ;

[0021] in, For the i The optimization target of each frequency point; is the load of the internal port; For the i The transmission coefficient from external port 2 to external port 1 at each frequency point in dB; For the i The transmission coefficient from external port 1 to external port 2 at each frequency point in dB; w 1 and w 2 is the index of the target frequency range.

[0022] Furthermore, when the number of rings in the initial model of the transmission metasurface is two and the initial model of the dual-band transmission metasurface is formed, the optimization objective function in S5 is:

[0023] ;

[0024] in, For the i The optimization target of each frequency point; is the load of the internal port; For the i The transmission coefficient from external port 2 to external port 1 at each frequency point in dB; For the i The transmission coefficient from external port 1 to external port 2 at each frequency point in dB; N The number of target frequency ranges to be optimized; For the j The index of the target frequency range.

[0025] Furthermore, the optimization objective of the optimization objective function is to simultaneously satisfy and The number of frequency points.

[0026] Furthermore, the target frequency range is 10 GHz to 20 GHz.

[0027] In another aspect, the present invention provides a rapid design device for a transmissive metasurface, comprising:

[0028] The first module is used to establish an initial model of the transmissive metasurface, including a dielectric layer and circular ring-segment metal patches located on the dielectric layer. The circular ring-segment metal patches are arranged in a circular shape with the center of the dielectric layer as the center point. The spacing between each circular ring segment metal patch is equal, and the circular ring segment metal patches in the same circle have the same size;

[0029] The second module is used to obtain the multi-port impedance parameters of the initial model of the transmissive metasurface;

[0030] The third module is used to construct an equivalent multi-port network model of the initial model of the transmissive metasurface based on the multi-port impedance parameters, and to establish the relationship between the voltage and current of the multi-port network model:

[0031] ;

[0032] ;

[0033] in, is the equivalent voltage of the external port; is the equivalent current of the external port; is the voltage of the internal port; is the current of the internal port; is the matrix expression of multi-port impedance parameters, for q The self-impedance between the external ports, for q External ports and N The mutual impedance between the internal ports, for N Internal ports and q The mutual impedance between the external ports, for N Mutual impedance between internal ports;

[0034] The fourth module is used to obtain the impedance parameters of the internal port based on the relationship between the voltage and current of the multi-port network model and the scattering coefficient of the external port :

[0035] ;

[0036] in, is the free space impedance, q × qThe diagonal matrix of which the diagonal elements are the free space electromagnetic wave impedance; For the i The external port transmits to the j The signal of the external port is i The ratio of the incident signals of the external ports;

[0037] The fifth module is used to construct an optimization objective function to optimize the performance of the initial model of the transmissive metasurface, maximize the bidirectional transmission efficiency, and obtain the transmissive metasurface.

[0038] On the other hand, the present invention provides a computer device comprising a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the steps of the rapid design method of the transmissive metasurface are implemented.

[0039] On the other hand, the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of a method for rapidly designing a transmissive metasurface.

[0040] Compared with the prior art, the beneficial technical effects of the present invention are:

[0041] The rapid design method, device, equipment and medium of the transmissive metasurface provided by the present invention simplify the complex transmissive metasurface structure into an equivalent circuit model by establishing a multi-port network model. Under this model, the S parameters of the transmissive metasurface under different design parameters can be quickly calculated, avoiding the problem that the traditional method requires re-full-wave simulation every time the parameters are adjusted; on the other hand, based on the multi-port network model, the present invention adopts an intelligent optimization algorithm to optimize the internal ports of the transmissive metasurface, which has the advantages of low computational cost and short optimization time.

[0042] The present invention combines physical modeling and electromagnetic simulation to achieve rapid design and performance optimization of transmissive metasurface structures. The present invention emphasizes flexible adjustment of the operating frequency and can quickly adjust the operating frequency range of the transmissive metasurface according to design requirements to meet the needs of multi-band applications, shorten the time required for optimization, and improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0044] Figure 1 A flowchart of a rapid design method for a transmissive metasurface provided in one embodiment;

[0045] Figure 2 This is a schematic diagram of the initial structure and port of a single-band transmission metasurface provided by an embodiment, wherein: Figure 2 (a) is a schematic diagram of the initial structure of the single-band transmission metasurface. Figure 2 (b) is a schematic diagram of the internal port of the initial structure of the single-band transmission metasurface. Figure 2 (c) External port action diagram of the initial structure of the single-band transmission metasurface;

[0046] Figure 3 This is a schematic diagram of the initial structure of a dual-band transmission metasurface provided by an embodiment, wherein: Figure 3 (a) is a schematic diagram of the initial structure of the dual-band transmission metasurface. Figure 3 (b) is a schematic diagram of the internal port of the initial structure of the dual-band transmission metasurface. Figure 3 (c) External port action diagram of the initial structure of the dual-band transmission metasurface;

[0047] Figure 4 A schematic diagram of a multi-port network model provided by an embodiment;

[0048] Figure 5 An initial structure of a transmission metasurface for performance testing provided by an embodiment, wherein: Figure 5 (a) is a schematic diagram of the initial structure of the single-band transmission metasurface. Figure 5 (b) Schematic diagram of the initial structure of the dual-band transmission metasurface;

[0049] Figure 6 A comparison diagram of the multi-port network modeling results and electromagnetic simulation results provided in an embodiment, wherein: Figure 6 (a) is a comparison between the multi-port network modeling results and electromagnetic simulation results of the initial structure of the single-band transmission metasurface. Figure 6 (b) Comparison between the multi-port network modeling results and electromagnetic simulation results of the initial structure of the dual-band transmission metasurface;

[0050] Figure 7 Schematic diagram of an optimized transmission metasurface structure provided by an embodiment, wherein: Figure 7 (a) is a schematic diagram of the optimized single-band transmission metasurface structure. Figure 7 (b) Schematic diagram of the optimized dual-band transmission metasurface structure;

[0051] Figure 8 A comparison diagram of the multi-port network modeling results and electromagnetic simulation results of the optimized transmission metasurface structure provided in one embodiment, wherein: Figure 8 (a) is a comparison chart of the multi-port network modeling results and electromagnetic simulation results of the optimized single-band transmission metasurface structure. Figure 8(b) Comparison between the multi-port network modeling results and electromagnetic simulation results of the optimized dual-band transmission metasurface initial structure. DETAILED DESCRIPTION

[0052] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0053] Reference Figure 1 One embodiment provides a rapid design method for a transmissive metasurface, comprising the following steps:

[0054] S1. Establish an initial model of a transmissive metasurface, including a dielectric layer and circular metal patches located on the dielectric layer. The circular metal patches are arranged in a circular shape with the center of the dielectric layer as the center point. The spacing between each circular metal patch is equal, and the circular metal patches in the same circular ring have the same size.

[0055] S2. Obtaining multi-port impedance parameters of the initial model of the transmissive metasurface;

[0056] S3. Construct an equivalent multi-port network model of the initial model of the transmissive metasurface based on the multi-port impedance parameters, and establish the relationship between the voltage and current of the multi-port network model:

[0057] ;

[0058] ;

[0059] in, is the equivalent voltage of the external port; is the equivalent current of the external port; is the voltage of the internal port; is the current of the internal port; is the matrix expression of multi-port impedance parameters, for q The self-impedance between the external ports, for q External ports and N The mutual impedance between the internal ports, for N Internal ports and q The mutual impedance between the external ports, for N Mutual impedance between internal ports;

[0060] S4. Obtain the impedance parameters of the internal ports based on the relationship between the voltage and current of the multi-port network model and the scattering coefficient of the external port :

[0061] ;

[0062] in, is the free space impedance, q × q The diagonal matrix of which the diagonal elements are the free space electromagnetic wave impedance; For the i The external port transmits to the j The signal of the external port is i The ratio of the incident signals of the external ports;

[0063] S5. Construct an optimization objective function to optimize the performance of the initial model of the transmissive metasurface, maximize the bidirectional transmission efficiency, and obtain the transmissive metasurface.

[0064] The dielectric layer is composed of a dielectric substrate, which is a square with a length of 7.75 mm, a thickness of 0.1 mm, a dielectric constant of 2.98, and a dielectric loss tangent of 0.002.

[0065] Reference Figure 2 , one embodiment provides a single-band transmission metasurface initial structure, Figure 2 (a) The outer diameter of a single ring D 1 is 7mm, inner diameter D 2 is 6mm; the central angle corresponding to each circular segment metal patch is 40°, and the central angle corresponding to the opening structure of each two adjacent circular segment metal patches is 5°; Figure 2 In (b), the numbers next to the triangle arrows represent the position numbers of the internal ports; Figure 2 (c) Demonstrates the effect of external ports on the initial structure of the single-band transmission metasurface.

[0066] The multi-port impedance parameters of the initial model of the transmissive metasurface are obtained by the following formula:

[0067] ;

[0068] in, is the impedance between the external ports, is the impedance between the external port and the internal port, is the impedance between the internal port and the external port, is the impedance between the internal ports.

[0069] The equivalent multi-port network model of the initial model of the transmissive metasurface is constructed based on the multi-port impedance parameters, such as Figure 4 As shown. Figure 4 middle, , for q The self-impedance between the external ports, for q External ports and N The mutual impedance between the internal ports, for N Internal ports and q The mutual impedance between the external ports, for N The mutual impedance between the internal ports.

[0070] The relationship between the voltage and current of the multi-port network model is established. The relationship between the voltage and current of the internal and external ports and the multi-port impedance parameters in the multi-port network model is as follows:

[0071] ;

[0072] The relationship between the voltage and current of the internal port and the multi-port impedance parameters is as follows:

[0073] ;

[0074] in, is the equivalent voltage of the external port; is the equivalent current of the external port; is the voltage of the internal port; is the current of the internal port;

[0075] Obtain the impedance parameters of internal ports based on the relationship between voltage and current in a multi-port network model and the scattering coefficient of the external port :

[0076] ;

[0077] in, is the free space impedance, q × q The diagonal matrix of which the diagonal elements are the free space electromagnetic wave impedance; For the i The external port transmits to the j The signal of the external port is i The ratio of the incident signals of the external ports;

[0078] Reference Figure 4 , since the transmission metasurface has two external ports, the scattering coefficient of the external ports is So it can be written as:

[0079] ;

[0080] in, is the reflection coefficient of external port 1; is the transmission coefficient from external port 2 to external port 1; is the transmission coefficient from external port 1 to external port 2; is the reflection coefficient of external port 2.

[0081] Reference Figure 5 (a) To verify the accuracy of the multi-port network model of the single-band transmission metasurface, the load combination of the internal port shown in Table 1 was selected, and the electromagnetic parameters of the single-band transmission metasurface were calculated using the multi-port network model and the electromagnetic simulation model respectively; the results are shown in Figure 6 As shown in (a), the solid line in the figure is the multi-port modeling result, and the dotted line is the electromagnetic simulation result. It can be seen that the multi-port modeling result is highly consistent with the electromagnetic simulation result, which shows that the multi-port network modeling has the same effect as the electromagnetic simulation modeling.

[0082] Table 1 Internal “open circuit” and “short circuit” states of the single-band transmission metasurface

[0083]

[0084] In the table, "0" indicates that the internal port load is "short-circuited"; "1" indicates that the internal port load is "open-circuited." By optimizing the internal "open-circuit" and "short-circuit" states of the transmissive metasurface, flexible control of the transmission characteristics is achieved, providing a new technical approach for the design of transmissive metasurfaces.

[0085] Construct an optimization objective function to optimize the performance of the initial model of the transmission metasurface, maximize the bidirectional transmission efficiency, and obtain the transmission metasurface; for the single-band transmission metasurface, the core goal is to maximize the bidirectional transmission efficiency. Specifically, at a given operating frequency, the transmission coefficient modulus from external port 2 to external port 1 is and the transmission coefficient modulus from external port 1 to external port 2 At the same time, the optimization process needs to ensure that within the target frequency range, the two transmission coefficient moduli meet the preset constraints. Therefore, when the number of rings in the initial model of the transmission metasurface is one and a single-band transmission metasurface initial model is formed, the optimization objective function in S5 is:

[0086] ;

[0087] in, For the iThe optimization target of each frequency point; is the load of the internal port; For the i The transmission coefficient from external port 2 to external port 1 at each frequency point in dB; For the i The transmission coefficient from external port 1 to external port 2 at each frequency point in dB; w 1 and w 2 is the index of the target frequency range, which is 10 GHz to 20 GHz.

[0088] The final optimized transmission metasurface structure is shown in the figure below: Figure 7 (a), the load combination of its internal port is shown in Table 2, and the comparison between the multi-port network modeling results and the electromagnetic simulation results of the optimized single-band transmission metasurface structure is shown in Figure 8 (a) For a single-band transmissive metasurface, at 14.5GHz-15.5GHz S 12 Parameters and S 21 The parameters are all greater than -3dB, indicating that it has good transmission performance, and the modeling results of the multi-port network are consistent with the modeling results of the electromagnetic simulation.

[0089] Table 2 Internal “open circuit” and “short circuit” states of the optimized single-band transmission metasurface

[0090]

[0091] In one embodiment, a dual-band transmission metasurface initial structure is provided. Figure 3 (a) The outer diameter of the outer ring D 1 is 7mm, inner diameter D 2 is 6mm; the outer diameter of the inner ring D 3 is 5mm, the inner diameter of the inner ring D 4 is 4mm; the central angle of each circular metal patch is 25°, and the central angle of the opening structure of each two adjacent circular metal patches is 5°; Figure 3 In (b), the numbers next to the triangle arrows represent the position numbers of the internal ports; Figure 3 (c) Demonstrates the role of external ports in the initial structure of the dual-band transmissive metasurface.

[0092] An equivalent multi-port network model of the initial model of the transmissive metasurface is constructed based on the multi-port impedance parameters, and the impedance parameters of the internal ports are obtained based on the relationship between the voltage and current of the multi-port network model. and the scattering coefficient of the external port This is consistent with the setting of single-band transmission metasurface.

[0093] Reference Figure 5 (b) To verify the accuracy of the multi-port network model of the dual-band transmission metasurface, the load combination of the internal port shown in Table 3 was selected, and the electromagnetic parameters of the single-band transmission metasurface were calculated using the multi-port network model and the electromagnetic simulation model respectively; the results are shown in Figure 3. Figure 6 As shown in (b), the solid line in the figure is the multi-port modeling result, and the dotted line is the electromagnetic simulation result. It can be seen that the multi-port modeling result is highly consistent with the electromagnetic simulation result, which shows that the multi-port network modeling has the same effect as the electromagnetic simulation modeling.

[0094] Table 3 Internal “open circuit” and “short circuit” states of the dual-band transmission metasurface

[0095]

[0096] The key to multi-band optimization is to achieve simultaneous optimization of multi-band transmission characteristics at multiple frequency points. In this embodiment, the dual-band transmission metasurface is optimized to maximize bidirectional transmission efficiency. That is, the number of rings in the initial model of the transmission metasurface is two. When the initial model of the dual-band transmission metasurface is formed, the optimization objective function described in S5 is:

[0097] ;

[0098] in, For the i The optimization target of each frequency point; is the load of the internal port; For the i The transmission coefficient from external port 2 to external port 1 at each frequency point in dB; For the i The transmission coefficient from external port 1 to external port 2 at each frequency point in dB; N The number of target frequency ranges to be optimized; For the j The target frequency range is 10 GHz to 20 GHz.

[0099] The optimization objective of the optimization objective function is to simultaneously meet the requirements of and The number of frequency points.

[0100] The final optimized transmission metasurface structure is shown in the figure below: Figure 7 (b), the load combination of its internal port is shown in Table 4, and the comparison between the multi-port network modeling results and the electromagnetic simulation results of the optimized dual-band transmission metasurface structure is shown in Figure 8(b) For the dual-band transmissive metasurface, the transmission frequencies of 15GHz-16GHz and 16GHz-17GHz are S 12 Parameters and S 21 The parameters are all greater than -3dB, indicating that it has good transmission performance, and the modeling results of the multi-port network are consistent with the modeling results of the electromagnetic simulation.

[0101] Table 4 Internal “open circuit” and “short circuit” states of the optimized dual-band transmission metasurface

[0102]

[0103] In one embodiment, a rapid design apparatus for a transmissive metasurface is provided, comprising:

[0104] The first module is used to establish an initial model of the transmissive metasurface, including a dielectric layer and circular ring-segment metal patches located on the dielectric layer. The circular ring-segment metal patches are arranged in a circular shape with the center of the dielectric layer as the center point. The spacing between each circular ring segment metal patch is equal, and the circular ring segment metal patches in the same circle have the same size;

[0105] The second module is used to obtain the multi-port impedance parameters of the initial model of the transmissive metasurface;

[0106] The third module is used to construct an equivalent multi-port network model of the initial model of the transmissive metasurface based on the multi-port impedance parameters, and to establish the relationship between the voltage and current of the multi-port network model:

[0107] ;

[0108] ;

[0109] in, is the equivalent voltage of the external port; is the equivalent current of the external port; is the voltage of the internal port; is the current of the internal port; is the matrix expression of multi-port impedance parameters, for q The self-impedance between the external ports, for q External ports and N The mutual impedance between the internal ports, for N Internal ports and q The mutual impedance between the external ports, for N Mutual impedance between internal ports;

[0110] The fourth module is used to obtain the impedance parameters of the internal port based on the relationship between the voltage and current of the multi-port network model and the scattering coefficient of the external port :

[0111] ;

[0112] in, is the free space impedance, q × q The diagonal matrix of which the diagonal elements are the free space electromagnetic wave impedance; For the i The external port transmits to the j The signal of the external port is i The ratio of the incident signals of the external ports;

[0113] The fifth module is used to construct an optimization objective function to optimize the performance of the initial model of the transmissive metasurface, maximize the bidirectional transmission efficiency, and obtain the transmissive metasurface.

[0114] On the other hand, the present invention provides a computer device comprising a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the steps of the rapid design method of a transmissive metasurface provided in any of the above embodiments are implemented. The computer device may be a server. The computer device comprises a processor, a memory, a network interface, and a database connected via a system bus. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device comprises a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store sample data. The network interface of the computer device is used to communicate with an external terminal via a network connection.

[0115] On the other hand, the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the rapid design method of a transmissive metasurface provided in any of the above embodiments.

[0116] Those skilled in the art will understand that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application may include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in many forms such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0117] Matters not covered by the present invention are known technologies.

[0118] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0119] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and such modifications and improvements are intended to fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be determined by the appended claims.

[0120] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A rapid design method for a transmissive metasurface, characterized in that: The following steps are involved: S1. Establish an initial model of a transmissive metasurface, including a dielectric layer and circular metal patches located on the dielectric layer. The circular metal patches are arranged in a circular shape with the center of the dielectric layer as the center point. The spacing between each circular metal patch is equal, and the circular metal patches in the same circular ring have the same size. S2. Obtaining multi-port impedance parameters of the initial model of the transmissive metasurface; S3. Construct an equivalent multi-port network model of the initial model of the transmissive metasurface based on the multi-port impedance parameters, and establish the relationship between the voltage and current of the multi-port network model: ； ； in, is the equivalent voltage of the external port; is the equivalent current of the external port; is the voltage of the internal port; is the current of the internal port; is the matrix expression of multi-port impedance parameters, for q The self-impedance between the external ports, for q External ports and N The mutual impedance between the internal ports, for N Internal ports and q The mutual impedance between the external ports, for N Mutual impedance between internal ports; S4. Obtain the impedance parameters of the internal ports based on the relationship between the voltage and current of the multi-port network model and the scattering coefficient of the external port : ； in, is the free space impedance, q × q The diagonal matrix of which the diagonal elements are the free space electromagnetic wave impedance; For the i The external port transmits to the j The signal of the external port is i The ratio of the incident signals of the external ports; S5. Construct an optimization objective function to optimize the performance of the initial model of the transmissive metasurface, maximize the bidirectional transmission efficiency, and obtain the transmissive metasurface.

2. The rapid design method of a transmissive metasurface according to claim 1, wherein: The dielectric layer is composed of a dielectric substrate, which is a square with a length of 7.75 mm, a thickness of 0.1 mm, a dielectric constant of 2.98, and a dielectric loss tangent of 0.

002.

3. The rapid design method of a transmissive metasurface according to claim 1, wherein: When the number of rings in the initial model of the transmission metasurface is one and a single-band transmission metasurface initial model is formed, the optimization objective function in S5 is: ； in, For the i The optimization target of each frequency point; is the load of the internal port; For the i The transmission coefficient from external port 2 to external port 1 at each frequency point in dB; For the i The transmission coefficient from external port 1 to external port 2 at each frequency point in dB; w 1 and w 2 is the index of the target frequency range.

4. The rapid design method of a transmissive metasurface according to claim 1, wherein: The number of rings in the initial model of the transmission metasurface is two. When the initial model of the dual-band transmission metasurface is formed, the optimization objective function in S5 is: ； in, For the i The optimization target of each frequency point; is the load of the internal port; For the i The transmission coefficient from external port 2 to external port 1 at each frequency point in dB; For the i The transmission coefficient from external port 1 to external port 2 at each frequency point in dB; N The number of target frequency ranges to be optimized; For the j The index of the target frequency range.

5. The rapid design method of a transmissive metasurface according to claim 4, wherein: The optimization objective of the optimization objective function is to simultaneously meet the requirements of and The number of frequency points.

6. The rapid design method of a transmissive metasurface according to any one of claims 3 or 4, characterized in that: The target frequency range is 10 GHz to 20 GHz.

7. A rapid design device for a transmissive metasurface, characterized in that: include: The first module is used to establish an initial model of the transmissive metasurface, including a dielectric layer and circular ring-segment metal patches located on the dielectric layer. The circular ring-segment metal patches are arranged in a circular shape with the center of the dielectric layer as the center point. The spacing between each circular ring segment metal patch is equal, and the circular ring segment metal patches in the same circle have the same size; The second module is used to obtain the multi-port impedance parameters of the initial model of the transmissive metasurface; The third module is used to construct an equivalent multi-port network model of the initial model of the transmissive metasurface based on the multi-port impedance parameters, and to establish the relationship between the voltage and current of the multi-port network model: ； ； in, is the equivalent voltage of the external port; is the equivalent current of the external port; is the voltage of the internal port; is the current of the internal port; is the matrix expression of multi-port impedance parameters, for q The self-impedance between the external ports, for q External ports and N The mutual impedance between the internal ports, for N Internal ports and q The mutual impedance between the external ports, for N Mutual impedance between internal ports; The fourth module is used to obtain the impedance parameters of the internal port based on the relationship between the voltage and current of the multi-port network model and the scattering coefficient of the external port : ； in, is the free space impedance, q × q The diagonal matrix of which the diagonal elements are the free space electromagnetic wave impedance; For the i The external port transmits to the j The signal of the external port is i The ratio of the incident signals of the external ports; The fifth module is used to construct an optimization objective function to optimize the performance of the initial model of the transmissive metasurface, maximize the bidirectional transmission efficiency, and obtain the transmissive metasurface.

8. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the rapid design method of the transmissive metasurface as described in any one of claims 1 to 5 are implemented.

9. A computer-readable storage medium, characterized in that A computer program is stored thereon, and when the computer program is executed by a processor, the steps of the rapid design method of the transmission metasurface as described in any one of claims 1 to 5 are implemented.

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