An antenna and electronic device

Abstract

This application provides an antenna and an electronic device. The antenna includes a first coil with a first opening. The first coil has a first end and a second end at the first opening. When an electrical signal is introduced into the first end and an electrical signal is exported from the second end, a magnetic field signal is radiated by the current in the first coil.

Description

Technical Field

[0001] This application relates to the field of electronic equipment technology, and to, but is not limited to, an antenna and an electronic device. Background Technology

[0002] In order to achieve a more "high-end" metallic feel and a slimmer body, more and more consumer electronic devices are now using pure metal back covers. However, the all-metal casing design, together with the metal backplate of the screen, will compress the antenna clearance, thus seriously affecting the antenna performance. Summary of the Invention

[0003] In view of this, embodiments of this application provide at least one antenna and an electronic device.

[0004] The technical solution of this application embodiment is implemented as follows:

[0005] This application provides an antenna, which includes a first coil having a first opening; the first coil has a first end and a second end at the first opening;

[0006] When an electrical signal is introduced into the first end and an electrical signal is exported from the second end, the magnetic field signal is radiated by the current in the first coil.

[0007] In some embodiments, the antenna further includes a second coil with a second opening;

[0008] When an electrical signal is applied to the first opening, a first magnetic field signal is radiated by exciting a first magnetic field signal through a first current in the first coil; and a second current is induced in the second coil based on the first magnetic field signal, thereby exciting a second magnetic field signal to radiate.

[0009] In some embodiments, the antenna further includes a second coil with a second opening;

[0010] When an electrical signal is applied to the second opening, a third magnetic field signal is radiated by exciting a third magnetic field signal through a third current in the second coil; and a fourth current is induced in the first coil based on the third magnetic field signal, thereby exciting a fourth magnetic field signal to radiate through the first coil.

[0011] In some embodiments, the positional relationship between the first coil and the second coil is one of the following:

[0012] The second coil surrounds the first coil;

[0013] The first coil surrounds the second coil.

[0014] In some embodiments, the antenna further includes a third coil located between the first coil and the second coil; the third coil is in the shape of a closed loop and is used to couple the current in the first coil and the second coil.

[0015] In some embodiments, the opening direction of the first coil is a first direction, the opening direction of the second coil is a second direction, and the first direction is opposite to the second direction.

[0016] This application provides an electronic device, which includes a metal back cover, a metal back plate for a screen, and the antenna described above; the antenna is disposed between the metal back cover and the metal back plate for the screen.

[0017] In some embodiments, the antenna is positioned at a predetermined distance from the frame of the electronic device to avoid affecting the performance of the antenna when the electronic device is being held.

[0018] In some embodiments, the antenna is fixed between the metal back cover and the metal back plate of the screen by a fastener, so that the antenna does not contact the metal back cover and the metal back plate.

[0019] In some embodiments, the antenna is disposed between the metal back cover and the metal back plate of the screen via an insulating component, so that the antenna does not contact the metal back cover and the metal back plate.

[0020] The antenna and electronic device provided in this application embodiment include an antenna comprising a first coil having a first opening; the first coil having a first end and a second end at the first opening; when an electrical signal is introduced into the first end and an electrical signal is exported from the second end, radiation is performed by radiating a magnetic field signal excited by the current in the first coil. By adopting the technical solution of this application embodiment, the antenna includes a first coil having a first opening; when an electrical signal is introduced into the first end of the first opening and an electrical signal is exported from the second end of the first opening, radiation is performed by radiating a magnetic field signal excited by the current in the first coil. This avoids the all-metal casing design and the metal backplate of the screen in the electronic device compressing the antenna clearance, thus overcoming the influence of the metal casing on the antenna radiation performance. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the antenna structure provided in an embodiment of this application;

[0022] Figure 2 This is another schematic diagram of the antenna structure provided in an embodiment of this application;

[0023] Figure 3 This is a schematic diagram of the magnetic field generated in this embodiment;

[0024] Figure 4 This is another schematic diagram of the antenna structure provided in an embodiment of this application;

[0025] Figure 5 This is a schematic diagram of the structure of the electronic device provided in the embodiments of this application;

[0026] Figure 6 This is a schematic diagram showing the placement of the antenna in the electronic device in this embodiment;

[0027] Figure 7 This is a schematic diagram illustrating the principle of electromagnetic mirroring in an embodiment of this application;

[0028] Figure 8 This is a schematic diagram of the antenna dimensions in this embodiment;

[0029] Figure 9 This is a simulation diagram of the antenna according to an embodiment of this application;

[0030] Figure 10 A simulated radiation pattern for the antenna in this application embodiment at 5 GHz was generated.

[0031] Figure 11 This is a schematic diagram illustrating different excitation methods used for the antenna in this embodiment;

[0032] Figure 12 This is a schematic diagram of the closed loop in the middle of the antenna in an embodiment of this application;

[0033] Figure 13 This is the magnetic field pattern generated in the embodiments of this application;

[0034] Figure 14 This refers to the radiation pattern of antenna signals in related technologies;

[0035] Figure 15 This is a schematic diagram of the parameter simulation results in the embodiments of this application. Detailed Implementation

[0036] Exemplary embodiments of the present application will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application may be implemented in various forms and should not be limited to the specific embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present application and to fully convey the scope of the disclosure of the present application to those skilled in the art.

[0037] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of this application. However, it will be apparent to those skilled in the art that this application can be practiced without one or more of these details. In other instances, to avoid confusion with this application, some technical features well-known in the art have not been described; that is, not all features of actual embodiments are described herein, nor are well-known functions and structures described in detail.

[0038] In order to achieve a more "high-end" metallic feel and a slimmer body, more and more consumer electronic devices are now using pure metal back covers. However, the all-metal casing design, together with the metal backplate of the screen, will compress the antenna clearance, thus seriously affecting the antenna performance.

[0039] Currently, most electronic devices with metal backplates use the shape of the metal frame to design the antenna after slotting the backplate, or directly cut notches in the metal backplate to make room for the antenna to meet performance requirements. However, this requires complex processes, which increases manufacturing costs, and the slotted part is inconsistent in color with the original metal shell, which destroys the overall appearance.

[0040] Therefore, there is an urgent need to propose a new antenna to solve the problem that the all-metal shell design and the metal back plate of the screen will jointly compress the antenna clearance, thus seriously affecting the antenna performance. Furthermore, it is necessary to achieve a one-time molding without damaging the metal structure, reduce the window injection molding process, effectively reduce processing costs, and maintain the integrity of the metal shell, thereby reducing the difficulty of secondary design.

[0041] The following describes an antenna provided in an embodiment of this application. Figure 1 This is a schematic diagram of the antenna structure provided in the embodiments of this application, such as... Figure 1 As shown, the antenna 10 includes a first coil 12 with a first opening 11; the first coil 12 has a first end 13 and a second end 14 at the first opening 11.

[0042] When an electrical signal is introduced into the first terminal 13 and an electrical signal is exported from the second terminal 14, the magnetic field signal is radiated by the current in the first coil 12.

[0043] In this embodiment, introducing an electrical signal at the first end 13 can be understood as feeding the antenna 10. Radiation via the current in the first coil 12 exciting a magnetic field signal can be understood as radiation via the current in the first coil 12 exciting an equivalent magnetic current.

[0044] It should be noted that the antenna 10 can also be referred to as an antenna module, a novel magnetic pole antenna structure, or a laptop antenna suitable for a pure metal environment; the antenna 10 can be placed between the complete metal casing of the electronic device and the full-screen metal back panel; the electronic device can be determined according to the actual situation and is not limited here. As an example, the electronic device can be a computer, terminal, etc.

[0045] In practical applications, the antenna 10 can be a laptop antenna suitable for pure metal environments; it can utilize the principle of electromagnetic mirroring, using the metal casing as a mirror source to maintain radiation, thus overcoming the influence of the metal casing on the antenna radiation performance.

[0046] In this embodiment, the antenna 10 includes a first coil 12 with a first opening 11. When an electrical signal is introduced into the first end 13 of the first opening 11 and an electrical signal is exported from the second end 14 of the first opening 11, the magnetic field signal is radiated by the current in the first coil 12. That is, the magnetic field signal is radiated by the current in the coil, which will not cause the all-metal casing design and the metal back plate of the screen in the electronic device to compress the antenna clearance, thus overcoming the influence of the metal casing on the antenna radiation performance.

[0047] In some embodiments, Figure 2 This is another schematic diagram of the antenna structure provided in the embodiments of this application, as shown below. Figure 2 As shown, the antenna also includes a second coil 16 with a second opening 15;

[0048] When an electrical signal is applied at the first opening 11, a first magnetic field signal is radiated by the first current in the first coil 12; and a second current is induced in the second coil 16 based on the first magnetic field signal, thereby radiating a second magnetic field signal through the second coil 16.

[0049] It should be noted that when an electrical signal is connected at the first opening 11, the first magnetic field signal is radiated by the first current in the first coil 12. This can be described as an active excitation path, where an electrical signal is introduced into the first end and an electrical signal is exported from the second end. The second magnetic field signal is then induced in the second coil 16 based on the first magnetic field signal, and then radiated by the second coil 16.

[0050] For ease of understanding, here we combine Figure 2To illustrate, when an electrical signal is connected to the first opening 11, an excitation circuit is generated. In this case, the outer ring is the active excitation path and the inner ring is the passive excitation path.

[0051] In some embodiments, the antenna further includes a second coil 16 with a second opening 15;

[0052] When an electrical signal is applied at the second opening 15, a third magnetic field signal is radiated by the third current in the second coil 16; and a fourth current is induced in the first coil 12 based on the third magnetic field signal, thereby radiating a fourth magnetic field signal through the first coil 12.

[0053] It should be noted that the antenna also includes a second coil 16 with a second opening 15; the second coil 16 has a third end and a fourth end in the second opening 15; when an electrical signal is connected at the second opening 15, the third magnetic field signal is radiated by the third current in the second coil 16. This can be referred to as an active excitation path when an electrical signal is introduced at the third end and exported at the fourth end. The fourth magnetic field signal is induced in the first coil based on the third magnetic field signal, and then the fourth magnetic field signal is radiated by the first coil 12. This can be referred to as a passive excitation path.

[0054] For ease of understanding, here we combine Figure 2 To illustrate, when an electrical signal is connected to the second opening 15, an excitation circuit is generated. In this case, the inner ring is the active excitation path, and the outer ring is the passive excitation path.

[0055] In practical applications, different excitation methods can be tried according to different needs. For ease of understanding, a schematic diagram of the magnetic field excited in this embodiment is shown here, such as... Figure 3 As shown, Figure 3 This is a schematic diagram of the magnetic field generated in this embodiment. The first coil 12 and the second coil 16 can be configured as a rectangular loop. By setting up a rectangular loop for excitation, a current path is formed, and an excited magnetic field is generated in the loop. The signal parallel to the direction of the metal shell can be equivalent to a magnetic current source outside the metal shell, which is equivalent to generating radiable signal energy outside the metal shell.

[0056] In some embodiments, the positional relationship between the first coil 12 and the second coil 16 is one of the following:

[0057] The second coil 16 surrounds the first coil 12;

[0058] The first coil 12 surrounds the second coil 16.

[0059] In this embodiment, the first coil 12 surrounding the second coil 16 can be understood as the first coil 12 being the outer coil and the second coil 16 being the inner coil; that is, the first coil 12 enclosing the second coil 16. This can be combined with... Figure 2 To understand, Figure 2 The example shown is the first coil 12 surrounding the second coil 16.

[0060] The second coil 16 surrounding the first coil 12 can be understood as the second coil 16 being the outer coil and the first coil 12 being the inner coil; that is, the second coil 16 enclosing the first coil 12. For ease of understanding, it can be further understood as... Figure 2 The outer coil in the text is understood to be the second coil 16. Figure 2 The inner coil in the diagram is understood to be the first coil 12, and will not be described in a drawing here.

[0061] In some embodiments, Figure 4 This is another schematic diagram of the antenna structure provided in the embodiments of this application, as shown below. Figure 4 As shown, the antenna 10 further includes a third coil 17, which is located between the first coil 12 and the second coil 16. The third coil 17 is in the shape of a closed loop and is used to couple the current in the first coil 12 and the second coil 16.

[0062] In this embodiment, the third coil 17 being located between the first coil 12 and the second coil 16 can be understood as the first coil 12 surrounding the third coil 17, and the third coil 17 surrounding the second coil 16; or, the second coil 16 surrounding the third coil 17, and the third coil 17 surrounding the first coil 12; that is, the third coil 17 is located in the middle position, and can also be called the intermediate coil, which can be understood as an intermediate closed loop. In practical applications, the intermediate closed loop is used to enhance the coupling of the active and passive excitation paths and expand the operating bandwidth.

[0063] For ease of understanding, let's assume the first opening 11 is designated as excitation position 1, where the input electrical signal is interpreted as the first coil 12 acting as the excitation circuit; and the second opening 15 is designated as excitation position 2, where the input electrical signal is interpreted as the second coil 12 acting as the excitation circuit. If the excitation circuit is activated at excitation position 1, the outer coil is the active excitation path, and the inner coil is the passive excitation path; the middle coil forms a closed loop, used to enhance the coupling between the active and passive excitation paths and expand the operating bandwidth. If the excitation circuit is activated at excitation position 2, the inner coil is the active excitation path, and the outer coil is the passive excitation path; the middle coil forms a closed loop, used to enhance the coupling between the active and passive excitation paths and expand the operating bandwidth.

[0064] In some embodiments, the opening direction of the first coil 12 is a first direction, and the opening direction of the second coil 16 is a second direction, wherein the first direction is opposite to the second direction.

[0065] In this embodiment, the first direction being opposite to the second direction can be understood as follows: when the first direction is clockwise, the second direction is counterclockwise; or, when the first direction is counterclockwise, the second direction is clockwise. This can be combined with... Figure 2 and / or Figure 4 To understand.

[0066] This application provides an electronic device. Figure 5 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. The electronic device 20 includes a metal back cover 21, a metal back plate 22 for the screen, and an antenna 23 as described in the foregoing embodiments of this application. The antenna 23 is disposed between the metal back cover 21 and the metal back plate 22 for the screen.

[0067] It should be noted that the antenna 23 is disposed between the metal back cover 21 and the metal back plate 22 of the screen; the specific position and orientation of the antenna 23 can be determined according to the actual spatial layout and is not limited here. As an example, the antenna 23 can be placed horizontally between the metal back cover 21 and the metal back plate 22 of the screen. Figure 5 In the middle, the metal back panel 22 of the screen has no bezel.

[0068] In some embodiments, the antenna 23 is positioned at a predetermined distance from the frame of the electronic device 20 to avoid affecting the performance of the antenna when the electronic device is being held.

[0069] It should be noted that the preset distance can be determined according to the actual situation and is not limited here. As an example, the preset distance can be 2cm.

[0070] In this embodiment, the screen of the electronic device 20 is surrounded by areas where it needs to be held by hand in tablet mode. In order to reduce the impact of hand coverage on antenna performance, the antenna 23 needs to be set at a position outside the preset distance from the frame of the electronic device 20.

[0071] To make it easier to understand, you can combine... Figure 6 To understand, Figure 6 This is a schematic diagram illustrating the antenna placement within the electronic device in this embodiment. The antenna should be placed horizontally between the metal back cover and the screen's metal backplate. The placement and orientation can be adjusted according to the actual space layout. Since the screen may require hand grip in tablet mode, the antenna can be placed at least 2cm away from the four sides to minimize the impact of hand contact on antenna performance. Furthermore, antenna performance may vary slightly depending on its location, requiring adjustments to the antenna substrate size, copper plating size, or antenna feed position.

[0072] In some embodiments, the antenna 23 is fixed between the metal back cover 21 and the metal back plate 22 of the screen by a fastener, so that the antenna 23 does not contact the metal back cover 21 and the metal back plate 22.

[0073] In this embodiment, the antenna 23 is designed to prevent it from coming into contact with the metal back cover 21 or the metal back plate 22, which would significantly reduce its radiation performance. Therefore, the antenna 23 is fixed between the metal back cover 21 and the metal back plate 22 of the screen using a fastener to avoid contact with the metal back cover 21 or the metal back plate 22, thereby preventing a significant reduction in antenna radiation performance.

[0074] It should be noted that the fixing component can be determined according to the actual situation and is not limited here. As an example, the fixing component can be a clip. The antenna 23 is fixed between the metal back cover 21 and the metal back plate 22 of the screen by the fixing component, so that the antenna 23 does not contact the metal back cover 21 and the metal back plate 22. This can be achieved by fixing the antenna 23 between the metal back cover 21 and the metal back plate 22 of the screen by the clip, avoiding contact with the metal back cover 21 or the metal back plate 22, thereby avoiding a significant reduction in antenna radiation performance.

[0075] In some embodiments, the antenna 23 is disposed between the metal back cover 21 and the metal back plate 22 of the screen via an insulating component, so that the antenna 23 does not contact the metal back cover 21 and the metal back plate 22.

[0076] In this embodiment, the antenna 23 would significantly reduce its radiation performance if it came into contact with the metal back cover 21 or the metal back plate 22. Therefore, it is necessary to insulate the antenna 23 between the metal back cover 21 and the metal back plate 22 of the screen using an insulating component to prevent contact with the metal back cover 21 or the metal back plate 22, thereby avoiding a significant reduction in antenna radiation performance.

[0077] It should be noted that the insulating component can be determined according to the actual situation and is not limited here. As an example, the insulating component can be a gasket made of metallic and non-metallic materials, such as a spiral wound gasket or a metal-clad gasket. The antenna 23 is disposed between the metal back cover 21 and the metal back plate 22 of the screen through the insulating component, so that the antenna 23 does not come into contact with the metal back cover 21 and the metal back plate 22. This can be achieved by insulating the antenna 23 between the metal back cover 21 and the metal back plate 22 of the screen through the insulating component, avoiding contact with the metal back cover 21 or the metal back plate 22, thereby avoiding a significant reduction in antenna radiation performance.

[0078] In this embodiment, the metal structure of the electronic device can be preserved during antenna manufacturing, allowing for one-time molding and reducing the need for window injection molding, thus effectively reducing processing costs; and the metal casing of the electronic device can be kept intact, reducing the difficulty of secondary design.

[0079] It should be noted that the description of the electronic device in this application is similar to the description of the antenna embodiment described above, and has similar beneficial effects as the structural embodiment; therefore, it will not be repeated. For technical details not disclosed in this electronic device embodiment, please refer to the description of the antenna embodiment in this application for understanding.

[0080] To better understand this application, the example antenna here is a magnetic pole antenna structure or antenna module; this application is mainly based on the principle of electromagnetic mirroring, and can be combined with... Figure 7 To understand, Figure 7 This is a schematic diagram illustrating the electromagnetic mirror principle in an embodiment of this application; the antenna structure model established in this application is as follows:

[0081] The antenna module is a single-layer printed circuit board (PCB) copper-clad laminate structure, consisting of a metal layer and a substrate layer stacked together. The overall board dimensions are 37.7mm x 8.9mm, with a board thickness of 3mm and a copper thickness of 0.035mm. The substrate used is Rogers RO3010 with a dielectric constant of 10.2. The specific dimensions of the copper traces in the single-layer copper-clad laminate are as follows... Figure 8 As shown, Figure 8 This is a schematic diagram of the antenna dimensions in this embodiment.

[0082] By establishing a simulation environment for the antenna and placing it between a complete metal casing and a full-screen metal backplate, it is possible to combine... Figure 9 To understand, Figure 9 This is a simulation diagram of the antenna in an embodiment of this application.

[0083] The antenna module should be placed horizontally between the metal casing and the screen's metal backplate. Furthermore, the metal layer must not contact the metal casing or screen's metal backplate, otherwise, the antenna's radiation performance will be significantly reduced. The placement and orientation can be adjusted according to the actual space layout. Since the screen is often held in tablet mode, it is recommended to place the antenna at least 2cm away from the four sides to minimize the impact of hand contact on antenna performance. Antenna performance may vary slightly depending on its location, requiring adjustments to the antenna substrate size, copper plating size, or antenna feed position. Specific placement can be determined by considering various factors. Figure 6 To understand.

[0084] By feeding the antenna, an equivalent magnetic current can be excited to radiate energy through the metal casing.

[0085] By setting up a rectangular loop for excitation, a current path is formed, generating an excited magnetic field within the loop, such as... Figure 3 The diagram shows the magnetic field at 5 GHz generated by the excitation. The signal parallel to the direction of the metal casing can be equivalent to a magnetic current source outside the metal casing, which is equivalent to generating radiable signal energy outside the metal casing. This can be obtained as follows... Figure 10 The simulation results shown are as follows: Figure 10 The antenna of the embodiment of this application is simulated at 5GHz. It can be seen that the antenna has gain at 5GHz and the radiation pattern is close to omnidirectional radiation.

[0086] The main circuitry of this antenna is divided into two return paths, one internal and one external, such as... Figure 11 As shown, Figure 11 This diagram illustrates different excitation methods used for the antenna in this embodiment. For example, in excitation circuit position 1, the outer ring is the active excitation path, and the inner ring is the passive excitation path; in excitation circuit position 2, the inner ring is the active excitation path, and the outer ring is the passive excitation path. Different excitation methods can be tried according to different requirements of the metal boundary environment.

[0087] The closed loop in the middle is used to enhance the coupling of the active and passive excitation paths and expand the operating bandwidth, which can be combined with... Figure 12 To understand, Figure 12 This is a schematic diagram of the closed loop in the middle of the antenna in an embodiment of this application.

[0088] When the antenna is excited by a signal, it generates a current loop, which in turn causes the passive excitation loop to generate a current loop simultaneously. This generates a magnetic field signal, which produces an equivalent magnetic field excitation outside the two metal plates (the metal casing and the metal backplate of the screen). This allows the antenna to penetrate both metal plates and radiate simultaneously. Because the entire metal environment is approximately symmetrical, the resulting radiation pattern can approximate omnidirectional radiation. This can be combined with... Figure 13 , Figure 14 , Figure 15 To understand; Figure 13 This is the magnetic field pattern generated in the embodiments of this application; Figure 14 This refers to the radiation pattern of antenna signals in related technologies; Figure 15 This is a schematic diagram of the parameter simulation results in the embodiments of this application.

[0089] It should be noted that the technical features described in the embodiments of this application can be combined arbitrarily without conflict.

[0090] It should be understood that the phrase "one embodiment" or "an embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of this application. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. It should be understood that in the various embodiments of this application, the sequence numbers of the above-described processes do not imply a sequential order of execution; the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application. The sequence numbers of the above-described embodiments are merely descriptive and do not represent the superiority or inferiority of the embodiments.

[0091] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods, such as: multiple units or components may be combined, or integrated into another system, or some features may be ignored or not performed.

[0092] The above description is merely an embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An antenna, wherein the antenna is placed between a complete metal casing and a full-screen metal back panel of an electronic device, and uses the metal casing as a mirror source to maintain radiation by utilizing the principle of electromagnetic mirroring; the antenna includes a first coil having a first opening; the first coil having a first end and a second end at the first opening; When an electrical signal is introduced into the first end and an electrical signal is exported from the second end, the magnetic field signal is radiated by the current in the first coil.

2. The antenna according to claim 1, wherein the antenna further comprises a second coil with a second opening; When an electrical signal is applied to the first opening, a first magnetic field signal is radiated by exciting a first magnetic field signal through a first current in the first coil; and a second current is induced in the second coil based on the first magnetic field signal, thereby exciting a second magnetic field signal to radiate.

3. The antenna according to claim 1, wherein the antenna further comprises a second coil with a second opening; When an electrical signal is applied to the second opening, a third magnetic field signal is radiated by exciting a third magnetic field signal through a third current in the second coil; and a fourth current is induced in the first coil based on the third magnetic field signal, thereby exciting a fourth magnetic field signal to radiate through the first coil.

4. The antenna according to claim 2 or 3, wherein the positional relationship between the first coil and the second coil is one of the following: The second coil surrounds the first coil; The first coil surrounds the second coil.

5. The antenna according to claim 4, further comprising a third coil located between the first coil and the second coil; the third coil being a closed loop, the third coil being used to couple the current in the first coil and the second coil.

6. The antenna according to claim 4, wherein the opening direction of the first coil is a first direction, the opening direction of the second coil is a second direction, and the first direction is opposite to the second direction.

7. An electronic device comprising a metal back cover, a metal backplate of a screen, and an antenna as claimed in any one of claims 1 to 6; the antenna being disposed between the metal back cover and the metal backplate of the screen.

8. The electronic device according to claim 7, wherein the antenna is disposed at a position outside a predetermined distance from the frame of the electronic device, so as to avoid affecting the performance of the antenna when the electronic device is held.

9. The electronic device according to claim 7, wherein the antenna is fixed between the metal back cover and the metal back plate of the screen by a fastener, so that the antenna does not contact the metal back cover and the metal back plate.

10. The electronic device of claim 7, wherein the antenna is disposed between the metal back cover and the metal back plate of the screen via an insulating component, such that the antenna does not contact the metal back cover and the metal back plate.

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