Vortex antenna for high-resolution electromagnetic imaging

Abstract

The invention discloses a vortex antenna for high-resolution electromagnetic imaging, and relates to the technical field of electromagnetic imaging, the vortex antenna comprises a feed source and a transmission-type antenna array composed of a plurality of vortex electromagnetic metasurface units, and different vortex electromagnetic metasurface units correspond to different compensation phases; and the transmission-type antenna array is used for performing phase compensation on the plane electromagnetic waves emitted by the feed source to generate focused vortex electromagnetic waves so as to realize electromagnetic imaging. The problems that the electromagnetic imaging operation is too complex and the cost is high due to the fact that the existing electromagnetic imaging resolution ratio is insufficient and a lens needs to be additionally added for focusing can be solved.

Description

Technical Field

[0001] The present application relates to the technical field of electromagnetic imaging, and in particular to a vortex antenna for high-resolution electromagnetic imaging. Background Art

[0002] The electromagnetic waves in electromagnetic imaging, also known as radio waves, are a kind of longitudinal and transverse waves composed of electric fields and magnetic fields. They have the advantages of energy transmission, fast speed and strong penetration, and are therefore widely used in various electromagnetic imaging technologies.

[0003] At present, in the process of electromagnetic imaging, plane electromagnetic waves are usually used, and lenses are added to focus the imaging. However, the electromagnetic imaging resolution of plane electromagnetic waves is low, and the light spot of plane electromagnetic waves is relatively large, so additional lenses need to be added to focus, which makes the electromagnetic imaging operation too complicated and costly. Summary of the invention

[0004] In view of this, the present application provides a vortex antenna for high-resolution electromagnetic imaging, the main purpose of which is to solve the problem that the current electromagnetic imaging resolution is insufficient and the additional lens focusing is required, resulting in the electromagnetic imaging operation being too complicated and costly.

[0005] According to the first aspect of the present application, a vortex antenna for high-resolution electromagnetic imaging is provided, comprising: a feed source and a transmission antenna array composed of multiple vortex electromagnetic metasurface units, different vortex electromagnetic metasurface units corresponding to different compensation phases; the transmission antenna array is used to perform phase compensation on the plane electromagnetic wave emitted by the feed source to generate a focused vortex electromagnetic wave to achieve electromagnetic imaging.

[0006] Optionally, the feed source includes a horn antenna, and the horn antenna is used to transmit planar electromagnetic waves to the transmission antenna array.

[0007] Optionally, the multiple vortex electromagnetic supersurface units are arranged in a rectangular distribution.

[0008] Optionally, each of the multiple vortex electromagnetic supersurface units includes a metal layer, a dielectric layer and a connecting layer, and the metal layer, the dielectric layer and the connecting layer are all multi-layered and are alternately arranged in sequence.

[0009] Optionally, the metal layer includes a metal patch, the dielectric layer includes a dielectric substrate, the connection layer includes a connection substrate, the metal patch is attached to the dielectric substrate, and the dielectric substrate is attached to the connection substrate.

[0010] Optionally, the metal patch includes a square ring and a circular patch disposed in the square ring.

[0011] According to a second aspect of the present application, a method for designing a vortex antenna for high-resolution electromagnetic imaging is provided, the method comprising:

[0012] Designing the physical dimensions of each vortex electromagnetic metasurface unit in the transmissive antenna array of the vortex antenna;

[0013] Determining the physical size of the transmission antenna array according to the physical size of each vortex electromagnetic metasurface unit;

[0014] Determining a distance between the transmissive antenna array and a feed source of the vortex antenna based on a physical size of the transmissive antenna array;

[0015] Based on the distance, determining a compensation phase of each vortex electromagnetic metasurface unit, wherein different vortex electromagnetic metasurface units correspond to different compensation phases;

[0016] According to the compensation phase of each vortex electromagnetic metasurface unit, the target metal patch radius of each vortex electromagnetic metasurface unit is determined to complete the design of the vortex antenna.

[0017] According to a third aspect of the present application, a vortex antenna design device for high-resolution electromagnetic imaging is provided, the method comprising:

[0018] A design unit for designing the physical size of each vortex electromagnetic metasurface unit in the transmissive antenna array of the vortex antenna;

[0019] A first determining unit, configured to determine the physical size of the transmission antenna array according to the physical size of each vortex electromagnetic metasurface unit;

[0020] A second determining unit, configured to determine a distance between the transmissive antenna array and a feed source of the vortex antenna based on a physical size of the transmissive antenna array;

[0021] A third determining unit is used to determine the compensation phase of each vortex electromagnetic metasurface unit based on the distance, wherein the compensation phases corresponding to different vortex electromagnetic metasurface units are different;

[0022] The fourth determination unit is used to determine the target metal patch radius of each vortex electromagnetic metasurface unit according to the compensation phase of each vortex electromagnetic metasurface unit to complete the design of the vortex antenna.

[0023] According to a fourth aspect of the present application, a storage medium is provided, on which a computer program is stored, and when the program is executed by a processor, the above-mentioned vortex antenna design method for high-resolution electromagnetic imaging is implemented.

[0024] According to the fifth aspect of the present application, an electronic device is provided, comprising a storage medium, a processor, and a computer program stored on the storage medium and executable on the processor, wherein when the processor executes the program, the above-mentioned vortex antenna design method for high-resolution electromagnetic imaging is implemented.

[0025] By means of the above technical solution, the vortex antenna for high-resolution electromagnetic imaging provided by the present application, compared with the prior art, can generate focused vortex electromagnetic waves by using a transmission antenna array composed of multiple vortex electromagnetic metasurface units to perform phase compensation on the plane electromagnetic waves emitted by the feed source, thereby realizing electromagnetic imaging. Since the transmission antenna array of the present application can perform phase compensation, and the compensation phases corresponding to different vortex electromagnetic metasurface units are different, the generated vortex electromagnetic waves can be focused, thereby improving the resolution of electromagnetic imaging and avoiding the addition of additional lenses, that is, it can solve the problem that the current electromagnetic imaging resolution is insufficient and the need to add additional lenses for focusing leads to overly complicated electromagnetic imaging operations and high costs.

[0026] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0028] Figure 1 A schematic diagram of a vortex antenna for high-resolution electromagnetic imaging provided by an embodiment of the present application is shown;

[0029] Figure 2 A front view of a transmissive antenna array when a vortex antenna provided by an embodiment of the present application generates a first-order modal vortex electromagnetic wave is shown;

[0030] Figure 3 A schematic diagram of the three-dimensional structure of a transmission antenna array when a vortex antenna provided in an embodiment of the present application generates a first-order modal vortex electromagnetic wave is shown;

[0031] Figure 4 A schematic structural diagram of a vortex electromagnetic metasurface unit provided in an embodiment of the present application is shown;

[0032] Figure 5 A schematic diagram of the structure of a metal patch provided in an embodiment of the present application is shown;

[0033] Figure 6A schematic diagram of the phase distribution of the focusing plane of the first-order modal vortex electromagnetic wave generated by the vortex antenna provided in an embodiment of the present application is shown;

[0034] Figure 7 A schematic diagram of the focusing plane amplitude distribution of the first-order modal vortex electromagnetic wave generated by the vortex antenna provided in an embodiment of the present application is shown;

[0035] Figure 8 A schematic diagram showing the focusing performance of the vortex antenna provided in an embodiment of the present application on the xoz plane is shown;

[0036] Fig. 9 A schematic diagram of a process flow of a vortex antenna design method for high-resolution electromagnetic imaging provided by an embodiment of the present application is shown;

[0037] Fig.10 The modulation phase diagram of the vortex electromagnetic metasurface unit provided by the embodiment of the present application as the radius of the metal patch changes is shown;

[0038] Fig.11 A schematic structural diagram of a vortex antenna design device for high-resolution electromagnetic imaging provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0039] The present application will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other without conflict.

[0040] The current electromagnetic imaging resolution of plane electromagnetic waves is low and requires additional lenses for focusing, which makes the electromagnetic imaging operation too complicated and costly.

[0041] In order to solve the above problems, an embodiment of the present invention provides a vortex antenna for high-resolution electromagnetic imaging, such as Figure 1 As shown, it includes: a feed source 1 and a transmission antenna array 3 composed of multiple vortex electromagnetic metasurface units, and different vortex electromagnetic metasurface units correspond to different compensation phases; the transmission antenna array 3 is used to perform phase compensation on the plane electromagnetic wave emitted by the feed source 1 to generate a focused vortex electromagnetic wave 4 to achieve electromagnetic imaging.

[0042] Wherein, the multiple vortex electromagnetic supersurface units are arranged in a rectangular distribution.

[0043] Specifically, the transmission antenna array 3 is composed of a plurality of vortex electromagnetic metasurface units arranged in a rectangular distribution, and the vortex electromagnetic metasurface units are composed of a multilayer structure. For example, the transmission antenna array 3 is composed of 21×21 vortex electromagnetic metasurface units arranged in a rectangular distribution. The feed source 1 is used to feed the transmission antenna array in the forward space and emit a plane electromagnetic wave. After receiving the plane electromagnetic wave, the transmission antenna array 3 will perform phase compensation on the plane electromagnetic wave, that is, change the phase of the plane electromagnetic wave beam, thereby generating a vortex electromagnetic wave 4 of a specific mode, and the vortex electromagnetic wave 4 can be focused. Figure 2 The front view of the transmission antenna array when the vortex antenna generates a first-order mode vortex electromagnetic wave is shown. Figure 3 A schematic diagram of the three-dimensional structure of a transmission antenna array when the vortex antenna generates a first-order modal vortex electromagnetic wave is shown.

[0044] The transmission antenna array of the embodiment of the present invention adopts PCB process technology, has the advantages of simple manufacturing and low loss, and the array units are compactly arranged and small in size.

[0045] Furthermore, the feed source 1 includes a horn antenna, and the horn antenna is used to transmit the planar electromagnetic wave 2 to the transmission antenna array 3.

[0046] Specifically, the inner diameter and outer diameter of the horn antenna can be set according to actual business needs. For example, the inner diameter of the horn antenna is 7.12mm×3.556mm, and the outer diameter is 47mm×33mm. The frequency of the plane electromagnetic wave emitted by the horn antenna covers 30GHz. The transmission antenna array 3 is forwardly fed in space. The plane electromagnetic wave changes the beam phase through the transmission antenna array 3, thereby generating a vortex electromagnetic wave 4 of a specific mode, which can be focused.

[0047] Furthermore, if Figure 4 As shown, each of the multiple vortex electromagnetic supersurface units includes a metal layer, a dielectric layer and a connecting layer. The metal layer, the dielectric layer and the connecting layer are all multi-layered and are alternately arranged in sequence.

[0048] Among them, the planar shape of each vortex electromagnetic metasurface unit, and the number of metal layers, dielectric layers and connection layers can be set according to actual business needs, and the embodiment of the present invention does not specifically limit this.

[0049] For example, the vortex electromagnetic metasurface unit is a square with a side length of 4.5 mm, which is distributed in a 21×21 pattern in the transmission antenna array, and the side length of the transmission antenna array is 94.5 mm. Each vortex electromagnetic metasurface unit includes a 15-layer structure, which specifically includes 6 metal layers, 5 dielectric layers, and 4 connection layers, which are alternately arranged from top to bottom as metal layer, dielectric layer, connection layer, metal layer, dielectric layer, connection layer, metal layer, dielectric layer, connection layer, metal layer, dielectric layer, connection layer, metal layer, dielectric layer, connection layer, metal layer, dielectric layer, connection layer, metal layer, dielectric layer, connection layer.

[0050] Furthermore, the metal layer includes a metal patch, the dielectric layer includes a dielectric substrate, the connection layer includes a connection substrate, the metal patch is attached to the dielectric substrate, and the dielectric substrate is attached to the connection substrate.

[0051] For example, the connection substrate uses Rogers 4450 material with a dielectric constant of 3.52 and a loss of 0.004. The side length of the connection substrate is 4.5 mm and the thickness is 0.2 mm. The dielectric substrate uses Rogers RT5880 material with a dielectric constant of 2.2 and a loss of 0.0009. The side length of the dielectric substrate is 4.5 mm and the thickness is 0.4 mm. The metal structure is made of a conductive material with a conductivity of 5.8×10 7 The outer ring of the square ring is the same size as the dielectric substrate, with a width of 0.15mm, and the radius of the circular patch ranges from 0.6mm to 1.6mm.

[0052] Furthermore, if Figure 5 As shown, the metal patch includes a square ring and a circular patch placed in the square ring. The sizes of the outer ring and the inner ring of the square ring can be set according to the actual business needs. For example, the side length of the outer ring of the square ring is 4.5mm, and the width between the outer ring and the inner ring is 0.15mm. The outer ring of the square ring is bonded to the unit, and the circular patch is at the center of the unit. When the radius Ro of the circular patch changes, the transmission phase will change accordingly. For example, the radius of the circular patch changes from 0.6mm to 1.6mm, and the transmission phase control range changes from -230° to 131. Therefore, the embodiment of the present invention can achieve 360-degree phase control by changing the radius Ro of the circular patch.

[0053] Figure 6 The schematic diagram of the phase distribution of the focusing plane of the vortex antenna generating the first-order mode vortex electromagnetic wave is shown. Figure 6 Obvious vortex distribution can be seen in the figure, and the vortex quality is very high. Figure 7 The schematic diagram of the focusing plane amplitude distribution of the first-order mode vortex electromagnetic wave generated by the vortex antenna is shown. Figure 7It can be seen that the focused transmitted beam has a smaller divergence angle, a smaller spot size and a smaller energy hole in the center compared to the plane wave, which is conducive to imaging. Figure 8 The performance diagram of the vortex antenna focusing on the xoz plane is shown. Figure 8 It can be seen that on the xoz plane, the embodiment of the present invention has good focusing performance.

[0054] A vortex antenna for high-resolution electromagnetic imaging provided by an embodiment of the present invention can generate focused vortex electromagnetic waves by using a transmission antenna array composed of multiple vortex electromagnetic metasurface units to perform phase compensation on a plane electromagnetic wave emitted by a feed source, thereby achieving electromagnetic imaging. Since the transmission antenna array of the embodiment of the present invention can perform phase compensation, and different vortex electromagnetic metasurface units correspond to different compensation phases, the generated vortex electromagnetic waves can be focused, thereby improving the resolution of electromagnetic imaging, and avoiding the addition of additional lenses, that is, it can solve the problem that the current electromagnetic imaging resolution is insufficient and the need to add additional lenses for focusing leads to overly complicated electromagnetic imaging operations and high costs.

[0055] The embodiment of the present invention also provides a vortex antenna design method for high-resolution electromagnetic imaging, such as Fig. 9 As shown, including:

[0056] Step 101: design the physical dimensions of each vortex electromagnetic metasurface unit in the transmissive antenna array of the vortex antenna.

[0057] The transmission antenna array is composed of a plurality of vortex electromagnetic metasurface units arranged in a rectangular distribution, and each vortex electromagnetic metasurface unit has the same physical size.

[0058] For the embodiment of the present invention, when designing a vortex antenna, it is necessary to first determine the physical size of each vortex electromagnetic metasurface unit in the antenna array. For this process, the method includes: establishing a physical model of any vortex electromagnetic metasurface unit in the transmission antenna array of the vortex antenna; based on the physical model and preset simulation software, optimizing the size parameters of the vortex electromagnetic metasurface unit to obtain the physical size of each vortex electromagnetic metasurface unit.

[0059] The preset simulation software may specifically be HFSS electromagnetic simulation software, or other electromagnetic simulation software, which is not specifically limited in the embodiment of the present invention.

[0060] Specifically, the vortex electromagnetic metasurface unit is first modeled in the preset simulation software, and the materials of the dielectric substrate and the connecting substrate are selected, and the electromagnetic boundary is set. Then, simulation optimization is performed to determine the physical dimensions of each vortex electromagnetic metasurface unit, including the side length and thickness of the metal patch, dielectric substrate and connecting substrate.

[0061] Step 102: Determine the physical size of the transmission antenna array according to the physical size of each vortex electromagnetic metasurface unit.

[0062] For an embodiment of the present invention, after determining the physical dimensions of each vortex electromagnetic metasurface unit, the physical dimensions of the transmission antenna array are determined based on the physical dimensions of each vortex electromagnetic metasurface unit, as well as the number and arrangement of the vortex electromagnetic metasurface units.

[0063] Specifically, since multiple vortex electromagnetic metasurface units can form an antenna array, the physical size of the transmission antenna array can be determined according to the physical size of each vortex electromagnetic metasurface unit. For example, the vortex electromagnetic metasurface units are distributed in a 21×21 array in the transmission antenna array, and the side length of each vortex electromagnetic metasurface unit is 4.5 mm, so the side length of the antenna array can be calculated to be 94.5 mm.

[0064] Step 103: Determine the distance between the transmission antenna array and the feed source of the vortex antenna based on the physical size of the transmission antenna array.

[0065] For this embodiment of the present invention, after determining the physical size of the transmissive antenna array, the distance between the transmissive antenna array and the feed source is estimated based on the physical size of the transmissive antenna array and the transmission amplitude and diffusion distance of the electromagnetic waves emitted by the feed source.

[0066] Specifically, the electromagnetic waves emitted by the feed source need to be irradiated onto the entire size surface of the transmissive antenna array as much as possible. Therefore, based on the physical size of the transmissive antenna array, and the transmission amplitude and diffusion distance of the electromagnetic waves emitted by the feed source, the distance between the transmissive antenna array and the feed source can be calculated. This distance can ensure that the electromagnetic waves can be irradiated onto the entire size surface of the transmissive antenna array.

[0067] Step 104: Determine the compensation phase of each vortex electromagnetic metasurface unit based on the distance.

[0068] Among them, different vortex electromagnetic metasurface units correspond to different compensation phases.

[0069] For the embodiment of the present invention, after determining the distance between the transmission antenna array and the feed source, the compensation phase of each vortex electromagnetic metasurface unit can be calculated based on the distance. For this process, step 104 specifically includes: determining the position vector of the feed source according to the distance; determining the position vector of each vortex electromagnetic metasurface unit according to the position of each vortex electromagnetic metasurface unit in the transmission antenna array; calculating the compensation phase of each vortex electromagnetic metasurface unit according to the position vector of the feed source and the position vector of each vortex electromagnetic metasurface unit. The specific formula is as follows:

[0070]

[0071] in, is the compensation phase, l represents the mode of the vortex electromagnetic wave, Φ0 is the phase of the electric field of the feed source at the transmission antenna array, k0 is the wave number in vacuum, μ0 is the observation direction, is the position vector of a vortex electromagnetic metasurface unit, is the position vector of the feed source, that is, the position vector of the horn antenna, which is related to the distance between the transmission antenna array and the feed source. Therefore, the compensation phase of each vortex electromagnetic metasurface unit can be calculated according to the above formula.

[0072] like Fig.10 As shown in Figure 2, as the radius of the metal patch changes, the transmission phase changes continuously. Fig.10 It shows that the radius of the metal patch ranges from 0.6mm to 1.6mm, and the transmission phase control range is -230° to 131°.

[0073] Step 105: Determine the target metal patch radius of each vortex electromagnetic metasurface unit according to the compensation phase of each vortex electromagnetic metasurface unit to complete the design of the vortex antenna.

[0074] For an embodiment of the present invention, in order to determine the target metal patch radius of each vortex electromagnetic metasurface unit, step 105 specifically includes: obtaining a relationship curve between the metal patch radius and the adjustment phase; determining the metal patch radius corresponding to different compensation phase ranges according to the relationship curve; based on the compensation phase of each vortex electromagnetic metasurface unit and the metal patch radius corresponding to the different compensation phase ranges, determining the target metal patch radius of each vortex electromagnetic metasurface unit.

[0075] Specifically, Fig.10 The relationship curve between the metal patch radius and the adjustment phase can be obtained through simulation. Fig.10The relationship curve in can be divided into multiple compensation phase ranges. Different compensation phase ranges correspond to different metal patch radiuses. The same compensation phase range corresponds to the same metal patch radius. The metal patch radius corresponding to the compensation phase range can be obtained by Fig.10 A plurality of points are selected from the above, and the average radius is calculated. Further, according to the range of the compensation phase of each vortex electromagnetic metasurface unit, the corresponding target metal patch radius is determined.

[0076] A vortex antenna design method for high-resolution electromagnetic imaging provided by an embodiment of the present invention, by designing the physical size of a transmission antenna array, and based on the physical size of the transmission antenna array, determining the distance between the transmission antenna array and the feed source of the vortex antenna, can calculate the compensation phase of each vortex electromagnetic supersurface unit according to the distance, so as to determine the target metal patch radius of each vortex electromagnetic supersurface unit to complete the design of the vortex antenna. The present invention can change the radius of the metal patch through the above-mentioned design method, so as to adjust the phase difference between the vortex electromagnetic supersurface units and generate vortex electromagnetic waves of a specified mode. Since the transmission antenna array of the embodiment of the present invention can perform phase compensation, and the compensation phases corresponding to different vortex electromagnetic supersurface units are different, the generated vortex electromagnetic waves can be focused, thereby improving the resolution of electromagnetic imaging, and avoiding the addition of additional lenses, that is, it can solve the problem that the current electromagnetic imaging resolution is insufficient, and the electromagnetic imaging operation is too complicated and the cost is high due to the need to add additional lenses for focusing.

[0077] Further, as Fig. 9 The specific implementation of the method shown in the embodiment provides a vortex antenna design device for high-resolution electromagnetic imaging, such as Fig.11 As shown, the device includes: a design unit 31, a first determination unit 32, a second determination unit 33, a third determination unit 34 and a fourth determination unit 35.

[0078] The design unit 31 can be used to design the physical size of each vortex electromagnetic metasurface unit in the transmissive antenna array of the vortex antenna.

[0079] The first determination unit 32 can be used to determine the physical size of the transmission antenna array according to the physical size of each vortex electromagnetic metasurface unit.

[0080] The second determining unit 33 may be configured to determine the distance between the transmission antenna array and the feed source of the vortex antenna based on the physical size of the transmission antenna array.

[0081] The third determination unit 34 may be configured to determine a compensation phase of each vortex electromagnetic metasurface unit based on the distance, wherein different vortex electromagnetic metasurface units correspond to different compensation phases.

[0082] The fourth determination unit 35 can be used to determine the target metal patch radius of each vortex electromagnetic metasurface unit according to the compensation phase of each vortex electromagnetic metasurface unit to complete the design of the vortex antenna.

[0083] In some embodiments, the design unit 31 can be specifically used to establish a physical model of any vortex electromagnetic metasurface unit in the transmissive antenna array of the vortex antenna; based on the physical model and preset simulation software, the size parameters of the vortex electromagnetic metasurface unit are optimized to obtain the physical size of each vortex electromagnetic metasurface unit.

[0084] In some embodiments, the first determination unit 32 can be specifically used to determine the physical size of the transmission antenna array according to the physical size of each vortex electromagnetic metasurface unit, and the number and arrangement of the vortex electromagnetic metasurface units.

[0085] In some embodiments, the second determination unit 33 can be specifically used to estimate the distance between the transmission antenna array and the feed source based on the physical size of the transmission antenna array, and the transmission amplitude and diffusion distance of the electromagnetic waves emitted by the feed source.

[0086] In some embodiments, the third determination unit 34 can be specifically used to determine the position vector of the feed source based on the distance; determine the position vector of each vortex electromagnetic metasurface unit based on the position of each vortex electromagnetic metasurface unit in the transmission antenna array; and calculate the compensation phase of each vortex electromagnetic metasurface unit based on the position vector of the feed source and the position vector of each vortex electromagnetic metasurface unit.

[0087] In some embodiments, the fourth determination unit 35 can be specifically used to obtain a relationship curve between the metal patch radius and the adjustment phase; determine the metal patch radius corresponding to different compensation phase ranges based on the relationship curve; based on the compensation phase of each vortex electromagnetic metasurface unit and the metal patch radius corresponding to the different compensation phase ranges, determine the target metal patch radius of each vortex electromagnetic metasurface unit.

[0088] It should be noted that for other corresponding descriptions of the functional units involved in the vortex antenna design device for high-resolution electromagnetic imaging provided by the embodiment of the present invention, reference can be made to Fig. 9 The corresponding description in will not be repeated here.

[0089] Based on the above Fig. 9 The method shown in the embodiment also provides a storage medium on which a computer program is stored. When the program is executed by a processor, the above-mentioned Fig. 9 A vortex antenna design approach for high-resolution electromagnetic imaging is shown.

[0090] Based on this understanding, the technical solution of the present application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, USB flash drive, mobile hard disk, etc.), including a number of instructions for enabling an electronic device (which can be a personal computer, server, or network device, etc.) to execute the methods of various implementation scenarios of the present application.

[0091] Based on the above Fig. 9 The method shown, and Fig.11 In order to achieve the above-mentioned purpose, the embodiment of the present application also provides an electronic device, which can be a personal computer, a tablet computer, a server, or other network equipment, etc. The device includes a storage medium and a processor; the storage medium is used to store a computer program; the processor is used to execute the computer program to achieve the above-mentioned Fig. 9 A vortex antenna design approach for high-resolution electromagnetic imaging is shown.

[0092] Optionally, the above-mentioned physical device may also include a user interface, a network interface, a camera, a radio frequency (RF) circuit, a sensor, an audio circuit, a WI-FI module, etc. The user interface may include a display, an input unit such as a keyboard, etc., and the optional user interface may also include a USB interface, a card reader interface, etc. The network interface may optionally include a standard wired interface, a wireless interface (such as a WI-FI interface), etc.

[0093] Those skilled in the art will appreciate that the above-mentioned physical device structure provided in this embodiment does not constitute a limitation on the physical device, and may include more or fewer components, or a combination of certain components, or different arrangements of components.

[0094] The storage medium may also include an operating system and a network communication module. The operating system is a program that manages the hardware and software resources of the above-mentioned physical device, and supports the operation of the information processing program and other software and / or programs. The network communication module is used to realize the communication between the components inside the storage medium, and the communication with other hardware and software in the information processing physical device.

[0095] Through the description of the above implementation methods, those skilled in the art can clearly understand that the present application can be implemented by means of software plus a necessary general hardware platform, or by hardware.

[0096] The embodiment of the present invention designs the physical size of the transmission antenna array, and based on the physical size of the transmission antenna array, determines the distance between the transmission antenna array and the feed source of the vortex antenna, and can calculate the compensation phase of each vortex electromagnetic metasurface unit according to the distance, so as to determine the target metal patch radius of each vortex electromagnetic metasurface unit to complete the design of the vortex antenna. The present invention can change the radius of the metal patch through the above-mentioned design method, so as to adjust the phase difference between the vortex electromagnetic metasurface units and generate vortex electromagnetic waves of specified modes. Since the transmission antenna array of the embodiment of the present invention can perform phase compensation, and the compensation phases corresponding to different vortex electromagnetic metasurface units are different, the generated vortex electromagnetic waves can be focused, so as to improve the resolution of electromagnetic imaging, and avoid the addition of additional lenses, that is, it can solve the problem that the current electromagnetic imaging resolution is insufficient, and the electromagnetic imaging operation is too complicated and the cost is high due to the need to add additional lenses for focusing.

[0097] Those skilled in the art will appreciate that the accompanying drawings are only schematic diagrams of a preferred implementation scenario, and the modules or processes in the accompanying drawings are not necessarily necessary for implementing the present application. Those skilled in the art will appreciate that the modules in the devices in the implementation scenario can be distributed in the devices of the implementation scenario according to the description of the implementation scenario, or can be changed accordingly and located in one or more devices different from the present implementation scenario. The modules of the above-mentioned implementation scenario can be combined into one module, or can be further split into multiple submodules.

[0098] The above serial numbers of this application are only for description and do not represent the advantages and disadvantages of the implementation scenarios. The above disclosure is only a few specific implementation scenarios of this application, but this application is not limited to them, and any changes that can be thought of by technicians in this field should fall within the scope of protection of this application.

Claims

1. A vortex antenna for high-resolution electromagnetic imaging, characterized in that: include: A feed source and a transmission antenna array composed of multiple vortex electromagnetic metasurface units, different vortex electromagnetic metasurface units correspond to different compensation phases; the transmission antenna array is used to perform phase compensation on the plane electromagnetic waves emitted by the feed source to generate focused vortex electromagnetic waves to achieve electromagnetic imaging.

2. The vortex antenna according to claim 1, characterized in that: The feed source comprises a horn antenna, and the horn antenna is used to transmit planar electromagnetic waves to the transmission antenna array; and / or the plurality of vortex electromagnetic metasurface units are arranged in a rectangular distribution; and / or Each of the multiple vortex electromagnetic supersurface units includes a metal layer, a dielectric layer and a connecting layer. The metal layer, the dielectric layer and the connecting layer are all multi-layered and are alternately arranged in sequence.

3. The vortex antenna according to claim 2, characterized in that: The metal layer includes a metal patch, the dielectric layer includes a dielectric substrate, the connection layer includes a connection substrate, the metal patch is attached to the dielectric substrate, and the dielectric substrate is attached to the connection substrate.

4. The vortex antenna according to claim 3, characterized in that: The metal patch includes a square ring and a circular patch arranged in the square ring.

5. A method for designing a vortex antenna for high-resolution electromagnetic imaging, characterized in that: include: Designing the physical dimensions of each vortex electromagnetic metasurface unit in the transmissive antenna array of the vortex antenna; Determining the physical size of the transmission antenna array according to the physical size of each vortex electromagnetic metasurface unit; Determining a distance between the transmissive antenna array and a feed source of the vortex antenna based on a physical size of the transmissive antenna array; Based on the distance, determining a compensation phase of each vortex electromagnetic metasurface unit, wherein different vortex electromagnetic metasurface units correspond to different compensation phases; According to the compensation phase of each vortex electromagnetic metasurface unit, the target metal patch radius of each vortex electromagnetic metasurface unit is determined to complete the design of the vortex antenna.

6. The method according to claim 5, characterized in that The physical dimensions of each vortex electromagnetic metasurface unit in the transmissive antenna array of the designed vortex antenna include: Establish a physical model of any vortex electromagnetic metasurface unit in the transmissive antenna array of the vortex antenna; Based on the physical model and preset simulation software, the size parameters of the vortex electromagnetic metasurface unit are optimized to obtain the physical size of each vortex electromagnetic metasurface unit.

7. The method according to claim 5, characterized in that Determining the physical size of the transmission antenna array according to the physical size of each vortex electromagnetic metasurface unit includes: Determining the physical size of the transmission antenna array according to the physical size of each vortex electromagnetic metasurface unit, and the number and arrangement of the vortex electromagnetic metasurface units; and / or The determining, based on the physical size of the transmissive antenna array, the distance between the transmissive antenna array and the feed source of the vortex antenna comprises: estimating the distance between the transmissive antenna array and the feed source according to the physical size of the transmissive antenna array, and the transmission amplitude and diffusion distance of the electromagnetic waves emitted by the feed source; and / or Determining the compensation phase of each vortex electromagnetic metasurface unit based on the distance includes: Determining a position vector of the feed source according to the distance; Determine the position vector of each vortex electromagnetic metasurface unit according to the position of each vortex electromagnetic metasurface unit in the transmission antenna array; Calculating the compensation phase of each vortex electromagnetic metasurface unit according to the position vector of the feed source and the position vector of each vortex electromagnetic metasurface unit; and / or Determining the target metal patch radius of each vortex electromagnetic metasurface unit according to the compensation phase of each vortex electromagnetic metasurface unit includes: Obtain a relationship curve between the radius of the metal patch and the adjustment phase; According to the relationship curve, determining the metal patch radius corresponding to different compensation phase ranges; Based on the compensation phase of each vortex electromagnetic metasurface unit and the metal patch radius corresponding to the different compensation phase ranges, the target metal patch radius of each vortex electromagnetic metasurface unit is determined.

8. A vortex antenna design device for high-resolution electromagnetic imaging, characterized in that: include: A design unit for designing the physical size of each vortex electromagnetic metasurface unit in the transmissive antenna array of the vortex antenna; A first determining unit, configured to determine the physical size of the transmission antenna array according to the physical size of each vortex electromagnetic metasurface unit; A second determining unit, configured to determine a distance between the transmissive antenna array and a feed source of the vortex antenna based on a physical size of the transmissive antenna array; A third determining unit is used to determine the compensation phase of each vortex electromagnetic metasurface unit based on the distance, wherein the compensation phases corresponding to different vortex electromagnetic metasurface units are different; The fourth determination unit is used to determine the target metal patch radius of each vortex electromagnetic metasurface unit according to the compensation phase of each vortex electromagnetic metasurface unit to complete the design of the vortex antenna.

9. A storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 5 to 7 is implemented.

10. An electronic device comprising a storage medium, a processor, and a computer program stored in the storage medium and executable on the processor, characterized in that: When the processor executes the computer program, the method according to any one of claims 5 to 7 is implemented.

Images