Broadband metasurface compact range antenna measurement system and parameter optimization method thereof

Abstract

The invention relates to a broadband metasurface compact field antenna measurement system and a parameter optimization method thereof, and the system is characterized in that the system comprises a supporting device, a reflective metasurface, a first feed source horn and a second feed source horn; a reflective metasurface is fixedly arranged on the supporting device; the first feed source horn and the second feed source horn are located on one side of the reflective metasurface, and the focal length positions of the first feed source horn and the second feed source horn are arranged on the same horizontal line and are perpendicular to the reflective metasurface; the supporting device is used for supporting the reflective metasurface to ensure that the centers of the first feed source horn and the second feed source horn and the center of the reflective metasurface are the same point; the first feed source horn corresponds to an observed first quiet zone, the second feed source horn corresponds to an observed second quiet zone, and the first quiet zone and the second quiet zone are used for measuring the far-field performance of the antenna; and the reflective metasurface is used for adjusting the electromagnetic wave signal. The millimeter wave compact range measuring device can be widely applied to the field of millimeter wave compact range measurement.

Description

Technical Field

[0001] The present invention relates to the field of millimeter wave compact range measurement, and in particular to a broadband metasurface compact range antenna measurement system and a parameter optimization method thereof. Background Art

[0002] The millimeter wave frequency band can provide a wider communication frequency band, which is of great significance in the future development of communications. Different frequency band divisions also mean that related test technologies will also change. As a more mature test method, the compact field will also change according to different test requirements.

[0003] The goal of the compact field is to generate electromagnetic waves with constant value and phase and plane wave form in the test area. There are three forms of OTA compact field testing, namely lens-type compact field, reflector-type compact field and holographic compact field. Among them, the reflector-type compact field adopts a large parabola to convert the spherical wave emitted by the focusing feed antenna into a plane wave. The reflector has the advantages of small beam absorption loss, more mature large-caliber processing methods, and wide frequency band coverage. This method not only requires a larger shaped reflective surface, but also has high processing difficulty and high cost for high frequency bands of millimeter waves and above. The holographic compact field is low in cost and easy to process, but the strong frequency and polarization dependence of the holographic compact field is challenging, and the holographic compact field has a narrow frequency band and a long focal length, which is mostly suitable for terahertz. For the lens-type compact field, it is divided into a transmission lens and a reflection lens. The transmission type needs to achieve more stringent constraints on phase and amplitude, and there are dielectric losses and matching losses of the air layer, and the overall efficiency is low. The reflective lens has a high efficiency due to the presence of a metal backplane, and can excite resonant modes both horizontally and vertically. The phase shift achieved while achieving efficient reflection can easily cover 360°.

[0004] However, existing compact ranges have problems such as large floor space and too many system devices. In addition, they can only achieve single-point or narrowband measurements in terms of bandwidth, which is not conducive to testing antennas in actual application scenarios. The current compact range design, whether it is the traditional design method that relies on the designer's own experience and electromagnetic simulation software, or the method that uses intelligent optimization algorithms to call electromagnetic simulation software to evaluate population individuals and thus solve the final structural parameters, requires multiple electromagnetic simulation calculations, consumes a lot of design costs, and seriously limits the design efficiency of the compact range. Summary of the invention

[0005] In view of the above problems, the object of the present invention is to provide a broadband metasurface compact range antenna measurement system and a parameter optimization method thereof with low compact range design cost and high design efficiency.

[0006] To achieve the above-mentioned object, the present invention adopts the following technical solutions: In a first aspect, a broadband metasurface compact range antenna measurement system is provided, comprising a supporting device, a reflective metasurface, a first feed horn and a second feed horn; The reflective metasurface is fixedly mounted on the support device; the first feed horn and the second feed horn are located on one side of the reflective metasurface, the focal length positions of the first feed horn and the second feed horn are arranged on the same horizontal line and are arranged perpendicular to the reflective metasurface, the first feed horn and the second feed horn are used to represent the states of two different feed focal lengths, respectively generate electromagnetic wave signals, and are incident on the reflective metasurface in a vertical manner; the support device is used to support the reflective metasurface, ensuring that the centers of the first feed horn and the second feed horn are the same point as the center of the reflective metasurface; The first feed horn corresponds to an observed first quiet zone, the second feed horn corresponds to an observed second quiet zone, the first quiet zone and the second quiet zone are used to measure the far-field performance of the antenna; the reflective metasurface is used to adjust the electromagnetic wave signal.

[0007] Furthermore, the reflective metasurface is composed of a plurality of metasurface units arranged in an array.

[0008] Furthermore, the reflective metasurface is composed of 41*41 metasurface units, and the size of the reflective metasurface is 20.5cm*20.5cm.

[0009] Furthermore, the first quiet zone and the second quiet zone are both 2.5 meters away from the reflective metasurface, and the profile height of the overall system is less than 2.4 meters.

[0010] Furthermore, based on the phase compensation formula, the phases of the electromagnetic waves incident on the first feed horn and the second feed horn are adjusted simultaneously so that the reference phase of the outgoing electromagnetic wave is the phase of the metasurface unit at the exact center of the reflective metasurface.

[0011] Furthermore, when the frequencies of the electromagnetic waves generated by the first feed horn and the second feed horn change, the constant difference of the phase compensation of the metasurface unit is maintained by adjusting the focal length and changing the quiet zone observation angle, satisfying the formula:

[0012]

[0013] in, are the frequencies of the electromagnetic waves generated by the first feed horn and the second feed horn respectively; For frequency and The multiple relationship between and The frequencies are and frequency The angle at which the electromagnetic wave is emitted; The difference in phase compensation of the metasurface units is a constant, so the phase compensation formula is:

[0014] in, and The frequency and frequency Phase compensation needs to be introduced below.

[0015] In a second aspect, a parameter optimization method based on a broadband metasurface compact field antenna measurement system is provided, comprising: Modeling metasurface units of a reflective metasurface; The geometric parameters to be sampled and the number of simulations are set, and a small amount of data of the set geometric parameters is sampled for the modeled hypersurface unit to form a data set; Perform correlation analysis on the phase shift of the geometric parameters and the S11 parameters of the metasurface unit, calculate the correlation coefficient, and select several geometric parameters that meet the preset requirements; Perform vector fitting on the data set obtained by sampling a small amount of data, use the pole residue transfer function, establish a proxy model based on the set number of simulations, and use the transfer function of the maximum order to unify the transfer function order of the proxy model; A genetic algorithm is used to perform multi-objective optimization prediction based on a number of geometric parameters that meet the preset requirements and a data set obtained by sampling a small amount of data and an established proxy model to obtain specific values ​​of the geometric parameters. The geometric parameters predicted by multi-objective optimization are brought into the modeled hypersurface unit for verification. If the pre-set goals are achieved, the optimization is stopped and the obtained geometric parameters are output; otherwise, the geometry obtained this time is added to the data set and vector fitting is performed again to establish a proxy model.

[0016] Furthermore, the genetic algorithm adopts NSGAⅡ algorithm.

[0017] According to a third aspect, a processing device is provided, comprising computer program instructions, wherein the computer program instructions, when executed by the processing device, are used to implement steps corresponding to the parameter optimization method of the above-mentioned broadband metasurface compact field antenna measurement system.

[0018] In a fourth aspect, a computer-readable storage medium is provided, on which computer program instructions are stored, wherein the computer program instructions, when executed by a processor, are used to implement the steps corresponding to the parameter optimization method of the above-mentioned broadband metasurface compact field antenna measurement system.

[0019] The present invention adopts the above technical solution, which has the following advantages: 1. The present invention covers the frequency band from 20 GHz to 30 GHz and can be used for wide-band millimeter-wave antenna measurement. In the case of a 20.5 cm reflective metasurface lens, it can stably achieve an 8 cm quiet zone, with a phase fluctuation of ±5° and an amplitude fluctuation of ±0.8 dB in the quiet zone. Only a small number of movements of the feed source and the observation surface are required to achieve wide-band coverage.

[0020] 2. The present invention can achieve a larger range of measurement quiet zone by increasing the number of metasurface units and expanding the aperture size of the reflective metasurface.

[0021] 3. The present invention has a simple structure, a low profile, and is easy to place. Compared with the reflective surface compact field and the holographic compact field, it has low site requirements, low cost, and high commercial practicality.

[0022] 4. The metasurface unit proposed in the present invention can achieve the phase change requirement of covering a full 360° by adjusting two geometric parameters (R0 and W0), thereby making the phase change smoother and more continuous. This method not only effectively solves the challenge of achieving a smooth phase curve over a wide frequency band, but also avoids the phase jump problem that may occur in the traditional single parameter adjustment, thereby significantly improving the performance and stability of the metasurface array.

[0023] 5. Traditional metasurface unit design requires a large amount of electromagnetic full-wave simulation calculations, which inevitably requires a lot of time and physical resource consumption. The present invention can accelerate the metasurface unit design process, improve the performance of the metasurface unit, effectively reduce the physical resource consumption required for designing the metasurface unit, effectively reduce the number of electromagnetic full-wave simulations, and achieve the required performance at the same time.

[0024] In summary, the present invention can be widely used in the field of millimeter wave compact field measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Throughout the accompanying drawings, the same reference numerals are used to represent the same components. In the accompanying drawings: Figure 1 It is a structural schematic diagram provided by an embodiment of the present invention; Figure 2 is a schematic diagram of a supersurface unit structure provided by an embodiment of the present invention; Figure 3 It is a schematic diagram of a method flow provided by an embodiment of the present invention; Figure 4 It is a schematic diagram of the amplitude of a single frequency quiet zone provided by an embodiment of the present invention; Figure 5 This is a schematic diagram of a single frequency quiet zone phase provided by an embodiment of the present invention; Figure 6 It is a schematic diagram of the S11 parameter phase shift curve (20 GHz-30 GHz) of the metasurface unit provided in one embodiment of the present invention. DETAILED DESCRIPTION

[0026] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0027] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0028] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0029] For ease of description, spatially relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figures, such as "inside", "outside", "inner side", "outer side", "below", "above", etc. Such spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figures.

[0030] At present, the existing compact range has problems such as large floor space and too many system devices, and can only achieve single-point or narrow-band measurement in terms of bandwidth, which is not conducive to testing the antenna in actual application scenarios. The current compact range design, whether it is the traditional design method that relies on the designer's own experience and electromagnetic simulation software, or the method of using intelligent optimization algorithms to call electromagnetic simulation software to evaluate population individuals and thus solve the final structural parameters, requires multiple electromagnetic simulation calculations, consumes a lot of design costs, and severely limits the design efficiency of the compact range. In recent years, with the rapid development of artificial intelligence, machine learning has been introduced into electromagnetic device design, and a computer-aided design (CAD) model has been constructed to replace the full-wave electromagnetic field simulation. Under the repeated call of the optimization algorithm, the design efficiency of the device can be greatly improved and the design cost can be saved. The present invention aims at the deficiencies of the prior art and provides a broadband metasurface compact field antenna measurement system, including a supporting device, a reflective metasurface, a first feed horn and a second feed horn; a reflective metasurface is fixedly arranged on the supporting device; the focal length positions of the first feed horn and the second feed horn are arranged on the same horizontal line and vertically arranged with the reflective metasurface on one side of the reflective metasurface, the first feed horn and the second feed horn are used to represent the states of two different feed focal lengths, respectively generate electromagnetic wave signals, and vertically incident on the reflective metasurface; the supporting device is used to support the reflective metasurface, ensuring that the centers of the first feed horn and the second feed horn are the same point as the center of the reflective metasurface; the first feed horn corresponds to the observed first quiet zone, the second feed horn corresponds to the observed second quiet zone, the first quiet zone and the second quiet zone are used to measure the far-field performance of the antenna; the reflective metasurface is used to adjust the electromagnetic wave signal. The present invention also uses machine learning to assist the design of the metasurface unit to complete a stable antenna measurement system with a small footprint, low system profile and high economic cost.

[0031] Example 1 like Figure 1 As shown, this embodiment provides a broadband metasurface compact field antenna measurement system, covering a frequency band of 20 GHz-30 GHz, including a supporting device 1, a reflective metasurface 2, a first feed horn 3 and a second feed horn 4.

[0032] A reflective metasurface 2 is fixedly mounted on the support device 1. Located on one side of the reflective metasurface 2, the focal length positions of the first feed horn 3 and the second feed horn 4 are arranged on the same horizontal line and are arranged perpendicularly to the reflective metasurface 2. The first feed horn 3 and the second feed horn 4 are used to represent the states of two different feed focal lengths, and respectively generate wide-band millimeter electromagnetic wave signals, which are incident perpendicularly to the reflective metasurface 2. The support device 1 is used to support the reflective metasurface 2 to ensure that the centers of the first feed horn 3 and the second feed horn 4 are the same point as the center of the reflective metasurface 2.

[0033] The first feed horn 3 corresponds to the observed first quiet zone 5 (the electric field strength and phase in this area are constant, that is, the area with constant electric field strength and phase is called the quiet zone), and the second feed horn 4 corresponds to the observed second quiet zone 6. The first quiet zone 5 and the second quiet zone 6 are used to measure the far-field performance of the antenna, such as: radiation pattern, gain. The reflective metasurface 2 is used to adjust the electromagnetic wave signal on each metasurface unit.

[0034] In a preferred embodiment, the specific process of measuring the antenna field performance is as follows: to specifically measure the far-field performance of the antenna, a receiving antenna, a turntable and a microwave darkroom are also required; the antenna to be measured is placed on the turntable, and the area where the turntable is located is the quiet zone of the present invention; the receiving antenna is placed, which may be a horn antenna or an open waveguide; the turntable is rotated, the value of the receiving antenna is read, and the far-field performance of the antenna to be measured is calculated according to the test system.

[0035] In a preferred embodiment, the reflective metasurface 2 is composed of 41*41 metasurface units, so the size of the reflective metasurface 2 is 20.5cm*20.5cm. For the reflective metasurface 2, the electromagnetic wave is incident perpendicular to the metasurface and exits at an angle of 20 degrees. The first quiet zone 5 and the second quiet zone 6 are both 2.5 meters away from the reflective metasurface 2, and the profile height of the overall system is less than 2.4m, which has good compactness. In the case of a 20.5cm reflective metasurface 2, an 8cm quiet zone can be stably achieved, with a phase fluctuation of ±5° and an amplitude fluctuation of ±0.8dB in the quiet zone. The present invention only requires a small number of moving the feed horn and the observation surface to achieve wide-band coverage. And by increasing the number of metasurface units and expanding the size of the aperture of the reflective metasurface 2, a larger range of quiet zones can be achieved.

[0036] Specifically, Figure 2 As shown in FIG. 1 , it is a schematic diagram of the structure of the super surface unit, where: is the width from the geometric center of the hypersurface to the first octagon; , are the widths of the inner octagonal ring and the outer octagonal ring, respectively; is the distance between the first octagon and the inner octagon ring, are the distances between the inner octagonal ring and the outer octagonal ring, respectively.

[0037] In a preferred embodiment, the first feed horn 3 and the second feed horn 4 are known antennas, and the phase distribution of the plane where the reflective metasurface 2 should be placed and the focal length is obtained. The phases of the first feed horn 3 and the second feed horn 4 on the reflective metasurface 2 are quantized every metasurface unit period. For the coordinates of any metasurface unit , and obtain the super surface unit The distribution of is: (1) in, is the wavelength corresponding to the selected frequency, and the frequency selected by the present invention is 26 GHz; is the distance between the feed horn and the reflective metasurface 2, i.e., the focal length of the feed; is the angle at which the electromagnetic wave emerges after being modulated by the reflective metasurface 2.

[0038] The metasurface unit introduces different phase shifts by adjusting its geometric parameters. After selecting the phase of the outgoing electromagnetic wave, for any coordinate The phase distribution of the metasurface unit is introduced into a phase compensation formula: (2) in, is the size of the phase that needs to be compensated; is the selected reference phase.

[0039] When the frequency changes, the phase compensation required is: (3) (4) in, and are the frequencies of the electromagnetic waves generated by the first feed horn 3 and the frequency of the electromagnetic wave generated by the second feed horn 4 The phase compensation that needs to be introduced is: and The frequency and frequency The angle at which the electromagnetic wave is emitted.

[0040] When the frequency of the electromagnetic wave changes, the constant difference of the phase compensation of the metasurface unit is maintained by adjusting the focal length and changing the observation angle of the quiet zone, satisfying the formula: (5) (6) Therefore, when the frequency of the electromagnetic wave changes, by moving the focal length and changing the quiet zone observation angle, the difference in phase compensation of the metasurface unit is a constant, and then: (7) in, For frequency and The multiple relationship between them.

[0041] The design of the metasurface unit satisfies the requirement of maintaining parallelism and equidistantness at different frequency points, so a wide-band quiet zone effect can be achieved by moving the angle of the feed horn and the quiet zone of the present invention.

[0042] In a preferred embodiment, the energy utilization rate of the reflective metasurface 2 is high, and most of the energy is reflected. Based on the phase compensation formula, the phases of the incident electromagnetic waves from the first feed horn 3 and the second feed horn 4 are adjusted simultaneously, so that the reference phase of the outgoing electromagnetic wave is the phase of the metasurface unit at the exact center of the reflective metasurface 2.

[0043] Example 2 like Figure 3 As shown, this embodiment provides a parameter optimization method for a broadband metasurface compact range antenna measurement system, comprising the following steps: 1) Using electromagnetic simulation software, the metasurface unit of the reflective metasurface in Example 1 is modeled.

[0044] 2) Set the geometric parameters to be sampled (i.e., the geometric parameters that need to be optimized to achieve the required performance of the antenna) and the number of simulations, and use the hyper-Latin cube sampling method to sample a small amount of geometric parameters of the modeled metasurface unit to form a data set.

[0045] 3) Perform a correlation analysis on the phase shift of the geometric parameters and the S11 parameters of the metasurface unit, calculate the correlation coefficient, and select the five geometric parameters that are most relevant to achieving the required performance of the antenna.

[0046] 4) Perform vector fitting on the data set obtained by sampling a small amount of data, and use the pole residue transfer function. Based on the set number of simulations, establish a proxy model for reducing the number of electromagnetic full-wave simulations, accelerating the calculation and finding the optimal parameter process, and use the maximum order transfer function to unify the transfer function order of the proxy model.

[0047] Specifically, proxy models are established for the amplitude and phase shift of the metasurface respectively, wherein the input of the proxy model of the metasurface amplitude is the poles and staggers obtained by vector fitting, and the output is the amplitude of the metasurface. A neural network is used to learn and predict the mapping relationship between the two. Specifically, the neural network can use ELM.

[0048] 5) A genetic algorithm (NSGAⅡ) is used to perform multi-objective optimization prediction based on the five geometric parameters selected that are most relevant to achieving the required antenna performance, according to the data set obtained by small data sampling and the established proxy model, to obtain the specific values ​​of the five geometric parameters. Among them, the multi-objective optimization means that the S11 parameter phase shift needs to achieve a smooth transition of 360°, and the S11 parameter phase shift satisfies parallel equidistant at different frequencies.

[0049] 6) The geometric parameters predicted by the multi-objective optimization are brought into the metasurface unit modeled in the electromagnetic simulation software for verification. If the pre-set goals are achieved, the optimization is stopped and the obtained geometric parameters are output; otherwise, the geometry obtained this time is added to the data set and the process goes to step 4) to re-perform vector fitting to establish the proxy model.

[0050] like Figure 4 and Figure 5 As shown, the field intensity and phase distribution of the quiet zone on the observation surface in the 25GHz frequency band, under the standard of phase change within ±5° and field intensity change within ±0.8dB, a quiet zone of 8cm is achieved, and the aperture efficiency of the reflective metasurface 2 is 29.27%. A larger metasurface lens can be used to achieve a larger quiet zone area. And in the frequency band of 20GHz to 30GHz, according to the standard of phase change within ±5° and field intensity change within ±0.8dB, the size of the quiet zone that can be formed is stable at 6cm, and the distance between the observation surface and the reflective metasurface 2 is always 2.5m. It can be seen that the present invention achieves good broadband coverage characteristics.

[0051] like Figure 6 As shown, it is a schematic diagram of the S11 parameter phase shift curve (20GHz-30GHz) of the metasurface unit obtained by the parameter optimization method of the present invention. The figure can illustrate the performance details of the optimized metasurface, and shows that different phase shift curves are obtained by changing the metasurface unit and its geometric parameters.

[0052] Example 3 This embodiment provides a processing device corresponding to the parameter optimization method of the broadband metasurface compact field antenna measurement system provided in Example 2. The processing device can be suitable for client processing devices, such as mobile phones, laptops, tablet computers, desktop computers, etc., to execute the method of Example 2.

[0053] The processing device includes a processor, a memory, a communication interface and a bus, and the processor, the memory and the communication interface are connected through the bus to complete mutual communication. The memory stores a computer program that can be run on the processing device, and the processing device executes the parameter optimization method of the broadband metasurface compact range antenna measurement system provided in this embodiment 2 when running the computer program.

[0054] In some implementations, the memory may be a high-speed random access memory (RAM), and may also include a non-volatile memory, such as at least one disk storage.

[0055] In some other implementations, the processor may be a central processing unit (CPU), a digital signal processor (DSP), or other general-purpose processors of various types, which are not limited herein.

[0056] In addition, the logic instructions in the above-mentioned memory can be implemented in the form of software functional units and can be stored in a computer-readable storage medium when sold or used as an independent product. Based on such an understanding, the technical solution of the present invention can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store program codes.

[0057] Those skilled in the art will understand that the structure of the above-mentioned computing device is only a partial structure related to the solution of the present invention, and does not constitute a limitation on the computing device to which the solution of the present invention is applied. The specific computing device may include more or fewer components, or combine certain components, or have a different arrangement of components.

[0058] Example 4 This embodiment provides a computer program product corresponding to the parameter optimization method of the broadband metasurface compact range antenna measurement system provided in Example 2. The computer program product may include a computer-readable storage medium carrying computer-readable program instructions for executing the parameter optimization method of the broadband metasurface compact range antenna measurement system described in Example 2.

[0059] Computer readable storage media can be tangible devices that hold and store instructions used by instruction execution devices. Computer readable storage media can be, for example, but not limited to, electronic storage devices, magnetic storage devices, optical storage devices, electromagnetic storage devices, semiconductor storage devices, or any combination thereof.

[0060] The above embodiment provides a computer-readable storage medium, whose implementation principle and technical effect are similar to those of the above method embodiment, and will not be repeated here.

[0061] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0062] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0063] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0064] The above embodiments are only used to illustrate the present invention, wherein the structure, connection mode and manufacturing process of each component may be changed. Any equivalent transformations and improvements based on the technical solution of the present invention should not be excluded from the protection scope of the present invention.

Claims

1. A broadband metasurface compact antenna measurement system, characterized in that: It includes a supporting device, a reflective metasurface, a first feed horn and a second feed horn; The reflective metasurface is fixedly mounted on the support device; the first feed horn and the second feed horn are located on one side of the reflective metasurface, the focal length positions of the first feed horn and the second feed horn are arranged on the same horizontal line and are arranged perpendicular to the reflective metasurface, the first feed horn and the second feed horn are used to represent the states of two different feed focal lengths, respectively generate electromagnetic wave signals, and are incident on the reflective metasurface in a vertical manner; the support device is used to support the reflective metasurface, ensuring that the centers of the first feed horn and the second feed horn are the same point as the center of the reflective metasurface; The first feed horn corresponds to an observed first quiet zone, the second feed horn corresponds to an observed second quiet zone, the first quiet zone and the second quiet zone are used to measure the far-field performance of the antenna; the reflective metasurface is used to adjust the electromagnetic wave signal.

2. A broadband metasurface compact antenna measurement system as claimed in claim 1, characterized in that: The reflective metasurface is composed of a plurality of metasurface units in an array.

3. A broadband metasurface compact antenna measurement system as claimed in claim 2, characterized in that: The reflective metasurface is composed of 41*41 metasurface units, and the size of the reflective metasurface is 20.5cm*20.5cm.

4. A broadband metasurface compact antenna measurement system as claimed in claim 3, characterized in that: The first quiet zone and the second quiet zone are both 2.5 meters away from the reflective metasurface, and the profile height of the overall system is less than 2.4 meters.

5. A broadband metasurface compact antenna measurement system as claimed in claim 1, characterized in that: Based on the phase compensation formula, the phases of the electromagnetic waves incident on the first feed horn and the second feed horn are adjusted simultaneously so that the reference phase of the outgoing electromagnetic wave is the phase of the metasurface unit at the exact center of the reflective metasurface.

6. A broadband metasurface compact antenna measurement system as claimed in claim 5, characterized in that: When the frequencies of the electromagnetic waves generated by the first feed horn and the second feed horn change, the constant difference in the phase compensation of the metasurface unit is maintained by adjusting the focal length and changing the quiet zone observation angle, satisfying the formula: in, are the frequencies of the electromagnetic waves generated by the first feed horn and the second feed horn respectively; For frequency and The multiple relationship between and The frequency and frequency The angle at which the electromagnetic wave is emitted; The difference in phase compensation of the metasurface units is a constant, so the phase compensation formula is: in, and The frequency and frequency Phase compensation needs to be introduced below.

7. A parameter optimization method for a broadband metasurface compact antenna measurement system based on any one of claims 1 to 6, characterized in that: include: Modeling metasurface units of a reflective metasurface; The geometric parameters to be sampled and the number of simulations are set, and a small amount of data of the set geometric parameters is sampled for the modeled hypersurface unit to form a data set; Perform correlation analysis on the phase shift of the geometric parameters and the S11 parameters of the metasurface unit, calculate the correlation coefficient, and select several geometric parameters that meet the preset requirements; Perform vector fitting on the data set obtained by sampling a small amount of data, use the pole residue transfer function, establish a proxy model based on the set number of simulations, and use the transfer function of the maximum order to unify the transfer function order of the proxy model; A genetic algorithm is used to perform multi-objective optimization prediction based on a number of geometric parameters that meet the preset requirements and a data set obtained by sampling a small amount of data and an established proxy model to obtain specific values ​​of the geometric parameters. The geometric parameters predicted by multi-objective optimization are brought into the modeled hypersurface unit for verification. If the pre-set goals are achieved, the optimization is stopped and the obtained geometric parameters are output; otherwise, the geometry obtained this time is added to the data set and vector fitting is performed again to establish a proxy model.

8. The parameter optimization method according to claim 7, characterized in that: The genetic algorithm adopts NSGAⅡ algorithm.

9. A processing device, characterized in that: It includes computer program instructions, wherein the computer program instructions, when executed by a processing device, are used to implement the steps corresponding to the parameter optimization method of the broadband metasurface compact range antenna measurement system described in any one of claims 7-8.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer program instructions, wherein the computer program instructions, when executed by a processor, are used to implement steps corresponding to the parameter optimization method of the broadband metasurface compact range antenna measurement system described in any one of claims 7-8.

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