Antenna device and electronic device

Abstract

This application provides an antenna device and an electronic device; wherein the antenna device includes: a first antenna stub and a second antenna stub; wherein a first end of the first antenna stub and a first end of the second antenna stub are both grounded; a second end of the first antenna stub is coupled to a second end of the second antenna stub; the current phase of the second antenna stub is opposite to the current phase of the first antenna stub, thereby canceling out part of the current of the first antenna stub to reduce SAR.

Description

Technical Field

[0001] This application relates to electronic technology, including but not limited to antenna devices and electronic equipment. Background Technology

[0002] Currently, the Specific Absorption Rate (SAR) is used to measure the electromagnetic radiation emitted by antennas to the human body. SAR represents the amount of electromagnetic energy absorbed by biological tissue per unit mass per unit time, measured in W / kg or mW / g. A lower SAR value indicates a smaller radiation impact on the human body; conversely, a higher SAR value indicates a greater impact. Therefore, reducing the SAR of an antenna is a key technical problem to be solved in antenna design. Summary of the Invention

[0003] In view of this, the antenna device and electronic equipment provided in this application can reduce the SAR of the antenna device.

[0004] According to one aspect of the present application, an antenna device is provided, comprising: a first antenna stub and a second antenna stub; wherein a first end of the first antenna stub and a first end of the second antenna stub are both grounded; a second end of the first antenna stub is coupled to a second end of the second antenna stub; the current phase of the second antenna stub is opposite to the current phase of the first antenna stub, thereby canceling out part of the current of the first antenna stub to reduce SAR.

[0005] According to another aspect of the embodiments of this application, an electronic device is provided, including any of the antenna devices described in the embodiments of this application.

[0006] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0007] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the specification, serve to explain the technical solutions of this application. Obviously, the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0008] Figure 1 This is a schematic diagram of the antenna device provided in the embodiments of this application;

[0009] Figure 2 This is a schematic diagram of another antenna device provided in an embodiment of this application;

[0010] Figure 3A schematic diagram illustrating the adjustment of the working length of the second-line branch provided in an embodiment of this application;

[0011] Figure 4 A schematic diagram of the structure of another antenna device provided in an embodiment of this application;

[0012] Figure 5 Another schematic diagram illustrating the adjustment of the working length of the second-side branch provided in this application embodiment;

[0013] Figure 6 This is a schematic diagram of the structure of another antenna device provided in the embodiments of this application;

[0014] Figure 7 A schematic diagram illustrating the change in current distribution at the feed point of the original mode antenna caused by the addition of a new stub, as provided in the embodiments of this application.

[0015] Figure 8 A schematic diagram of the SAR hotspot distribution at the feed point of the newly added stub equalization original mode antenna provided in the embodiments of this application;

[0016] Figure 9 A schematic diagram illustrating the current generated by the newly added stub in an embodiment of this application, which is opposite to that of the original antenna.

[0017] Figure 10 This is a schematic diagram of another antenna device provided in an embodiment of this application;

[0018] Figure 11 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the specific technical solutions of this application will be further described in detail below with reference to the accompanying drawings of the embodiments of this application. The following embodiments are used to illustrate this application, but are not intended to limit the scope of this application.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.

[0021] In the following description, references are made to “some embodiments,” which describe a subset of all possible embodiments. However, it is understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0022] This application provides an antenna device. Figure 1 This is a schematic diagram of the antenna device provided in the embodiments of this application, such as... Figure 1 As shown, the device 1 includes a first antenna stub 11 and a second antenna stub 12; wherein, the first end 111 of the first antenna stub 11 is grounded, and the first end 121 of the second antenna stub 12 is grounded; the second end 112 of the first antenna stub 11 is coupled to the second end 122 of the second antenna stub 12; the current phase of the second antenna stub 12 is opposite to the current phase of the first antenna stub 11, thereby canceling part of the current of the first antenna stub 11 to reduce SAR.

[0023] Understandably, the SAR value is strongly correlated with the magnitude of the antenna current density. Since the current phase of the second antenna stub 12 is opposite to the current phase of the first antenna stub 11, and their ends (i.e., the second end) are coupled, this will cause a change in the current distribution at the feed point of the first antenna stub 11, which will have the effect of current reversal cancellation. For SAR hotspots, this will produce an equalization effect, thereby reducing the SAR.

[0024] In this embodiment, both the first antenna stub 11 and the second antenna stub 12 participate in radiation; thus, radiation performance can be improved while reducing SAR. For example, in the 5G Wi-Fi band (i.e., 5.1-5.8GHz), its LH / RH-eff performance is improved by 0.5dB-3.78dB compared to the previous performance, and LH / RH-SAR is reduced by 17%-36%.

[0025] This application embodiment further provides an antenna device, Figure 2 This is a schematic diagram of another antenna device provided in an embodiment of this application, as shown below. Figure 2 As shown, the device 2 includes, in addition to Figure 1 In addition to the structure shown, it also includes a first adjustment circuit 21; the first end 211 of the first adjustment circuit 21 is grounded, and the second end 212 is electrically connected to the first part 123 of the second antenna stub 12; the first part 123 does not include the end of the second antenna stub 12; the first adjustment circuit 21 is used to adjust the working length of the second antenna stub 12 to reduce the SAR generated by the current working frequency band of the first antenna stub 11.

[0026] Understandably, different operating lengths (i.e., electrical lengths) of the second antenna stub 12 correspond to different frequency bands for cancellation and shunting. In other words, a limited operating length only effectively reduces SAR in specific radio frequency bands, with little impact on other frequency bands. Therefore, in this embodiment, a first adjustment circuit 21 is added to adjust the operating length of the second antenna stub 12, thereby reducing the SAR generated by the current operating frequency band of the first antenna stub 11. This increases the flexibility of the antenna device, enabling it to reduce SAR regardless of whether it operates in the first or second frequency band.

[0027] It should be noted that the structure of the first adjustment circuit 21 and the devices used to implement the adjustment are not limited in this application and can be of various types. For example, the first adjustment circuit 21 may include a switching circuit; or, for example, the first adjustment circuit 21 may include an LC filter network. Their purpose is to adjust the working length of the second antenna stub.

[0028] Specifically, in some embodiments, the first adjustment circuit 21 includes a switching circuit, which is used to respond to a first adjustment command to turn on or off the electrical connection between the first part 123 of the second antenna stub 12 and ground, thereby realizing the adjustment of the working length of the second antenna stub 12; wherein, the first adjustment command is generated according to the correspondence between the current working frequency band of the first antenna stub 11 and the working length supported by the second antenna stub 12.

[0029] Understandably, different antenna stub sizes affect different frequency bands. Therefore, the correspondence between the radio frequency bands supported by the first antenna stub 11 and the working length supported by the second antenna stub 12 can be predefined. Based on this, according to the current working frequency band of the first antenna stub 11, the predefined correspondence can be queried to find the current working length of the second antenna stub 12 corresponding to the current working frequency band, and then the corresponding first adjustment command can be generated.

[0030] For example, as shown in Table 1, assuming that the first antenna stub 11 supports radio frequency bands including band 1 and band 2, and the second antenna stub 12 supports operating lengths including length 1 (i.e., the overall length of the second antenna stub 12) and length 2 (i.e., the length from the first part 123 to the second end 122 of the second antenna stub 12); among which, length 1 has a greater shunting effect on the first antenna stub 11 when it operates in band 1, that is, it has a better effect on reducing SAR; length 2 has a greater shunting effect on the first antenna stub 11 when it operates in band 2.

[0031] Table 1

[0032] Band 1 Length 1 Band 2 Length 2

[0033] So, if Figure 3As shown, taking the first adjustment circuit 21 including the switching circuit 213 as an example, when the current operating frequency band of the first antenna stub 11 is frequency band 1, the adjustment command responded by the switching circuit 213 is to disconnect the electrical connection between the first part 123 of the second antenna stub 12 and ground, that is, the switching circuit 213 disconnects the electrical connection between the first part 123 of the second antenna stub 12 and ground, thereby making the working length of the second antenna stub 1 length 1; when the current operating frequency band of the first antenna stub 11 is frequency band 2, the adjustment command responded by the switching circuit 213 is to connect the electrical connection between the first part 123 of the second antenna stub 12 and ground, that is, the switching circuit 213 connects the electrical connection between the first part 123 of the second antenna stub 12 and ground, thereby making the working length of the second antenna stub 12 length 2.

[0034] Specifically, in some other embodiments, the first adjustment circuit 21 may also include an LC filter network for adjusting the operating length of the second antenna stub 12 to reduce the SAR generated by the current operating frequency band of the first antenna stub 11.

[0035] It should be noted that this application does not limit the structure and components of the LC filter network; it can be any type of network capable of adjusting the operating length of the second antenna stub 12. The LC filter network can be a multi-order filter structure or a single-order filter structure. It is not limited to a lumped inductor and / or capacitor implementation. It can also be a custom device or a printed circuit to implement the filtering characteristics, etc.

[0036] This application embodiment further provides an antenna device, Figure 4 This is a schematic diagram of the structure of another antenna device provided in an embodiment of this application, as shown below. Figure 4 As shown, the device 4 includes, in addition to Figure 2 In addition to the structure shown, it also includes a second adjustment circuit 41; the first end 411 of the second adjustment circuit 41 is grounded, and the second end 412 is electrically connected to the second part 124 of the second stub 12; the second part 124 does not include the end of the second antenna stub 12; the first adjustment circuit 21 and the second adjustment circuit 41 are used to jointly adjust the working length of the second antenna stub 12 to reduce the SAR generated by the current working frequency band of the first antenna stub 11.

[0037] Understandably, the more second conditioning circuitry included in the antenna device, the more types of operating lengths the second antenna stub 12 can support, and correspondingly, the more types of radio frequency bands that can be specifically reduced for SAR. For example, combined with Figure 4The operating lengths supported by the second antenna stub 12 are shown in Table 2. Assuming that the first antenna stub 11 supports radio frequency bands including band 1, band 2, and band 3, the operating lengths supported by the second antenna stub 12 include length 1 (i.e., the overall length of the second antenna stub 12), length 2 (i.e., the length from the first part 123 to the second end 122 of the second antenna stub 12), and length 3 (i.e., the length from the second part 124 to the second end 122 of the second antenna stub 12). Among them, length 1 has a greater shunting effect on the first antenna stub 11 when it operates in band 1, that is, it has a better SAR reduction effect; length 2 has a greater shunting effect on the first antenna stub 11 when it operates in band 2; and length 3 has a greater shunting effect on the first antenna stub 11 when it operates in band 3.

[0038] Table 2

[0039] Band 1 Length 1 Band 2 Length 2 Band 3 Length 3

[0040] So, if Figure 5 As shown, taking the first adjustment circuit 21 including the switch circuit 213 and the second adjustment circuit 41 including the switch circuit 513 as an example, when the current operating frequency band of the first antenna stub 11 is frequency band 1, the adjustment command responded by the switch circuit 213 is to disconnect the electrical connection between the first part 123 of the second antenna stub 12 and the ground, that is, the switch circuit 213 disconnects the electrical connection between the first part 123 of the second antenna stub 12 and the ground, and the adjustment command responded by the switch circuit 513 is to disconnect the electrical connection between the second part 124 of the second antenna stub 12 and the ground, that is, the switch circuit 513 disconnects the electrical connection between the second part 124 of the second antenna stub 12 and the ground. Thus, the switch circuit 213 and the switch circuit 513 work together to make the working length of the second antenna stub 1 the length of length 1.

[0041] When the current operating frequency band of the first antenna stub 11 is frequency band 2, the adjustment command responded by the switching circuit 213 is to conduct the electrical connection between the first part 123 of the second antenna stub 12 and the ground, that is, the switching circuit 213 conducts the electrical connection between the first part 123 of the second antenna stub 12 and the ground, and the adjustment command responded by the switching circuit 513 is to disconnect the electrical connection between the second part 124 of the second antenna stub 12 and the ground, that is, the switching circuit 513 disconnects the electrical connection between the second part 124 of the second antenna stub 12 and the ground. Thus, the switching circuits 213 and 513 work together to make the operating length of the second antenna stub 2 be length 2.

[0042] When the current operating frequency band of the first antenna stub 11 is frequency band 3, the adjustment command responded by the switching circuit 213 is to disconnect the electrical connection between the first part 123 of the second antenna stub 12 and ground, that is, the switching circuit 213 disconnects the electrical connection between the first part 123 of the second antenna stub 12 and ground, and the adjustment command responded by the switching circuit 513 is to connect the electrical connection between the second part 124 of the second antenna stub 12 and ground, that is, the switching circuit 513 connects the electrical connection between the second part 124 of the second antenna stub 12 and ground. Thus, the switching circuits 213 and 513 work together to make the operating length of the second antenna stub 3.

[0043] It should be noted that the structure of the second adjustment circuit 41 can be the same as or different from that of the first adjustment circuit 21. The second adjustment circuit 41 may include a switching circuit or an LC filter network. That is, the working length of the second antenna stub 12 can be adjusted in the second adjustment circuit 41 through a switching circuit or an LC filter network.

[0044] This application embodiment further provides an antenna device, Figure 6 This is a schematic diagram of the structure of another antenna device provided in the embodiments of this application, as shown below. Figure 6 As shown, the device 6 includes, in addition to Figure 1 , Figure 2 or Figure 4 In addition to the structure shown, it also includes a first spring 61, a second spring 62, and a third spring 63; among which,

[0045] The first end 611 of the first spring 61 is grounded, and the second end 612 is electrically connected to the first end 121 of the second antenna stub 12, thereby grounding the first end 121 of the second antenna stub 12.

[0046] The first end 621 of the second spring 62 is grounded, and the second end 622 of the second spring 62 is electrically connected to the first end 211 of the first adjustment circuit 21, thereby grounding the first end 211 of the first adjustment circuit 21.

[0047] The first end 631 of the second spring 63 is grounded, and the second end 632 of the second spring 63 is electrically connected to the first end 411 of the second adjustment circuit 41, thereby grounding the first end 411 of the first adjustment circuit 41.

[0048] Understandably, both the first spring 61 and the second spring 62 are conductive components. The reason for using springs is to facilitate the assembly of the antenna device into electronic equipment.

[0049] In this application, the manufacturing process of the second antenna stub 12 is not limited and can be various. In some embodiments, the manufacturing process of the second antenna stub 12 is laser-direct-structuring (LDS), flexible printed circuit board (FPC), or metal frame, etc.

[0050] In this application, the first antenna stub 11 is not limited. In some embodiments, it may support only one wireless frequency band, while in other embodiments, the first antenna stub 11 may support multiple different wireless frequency bands. For example, the first antenna stub 11 is a three-in-one antenna that supports L1, 2.4G WiFi, and 5G WiFi.

[0051] The following describes an exemplary application of the embodiments of this application in a real-world application scenario.

[0052] Because antenna SAR hotspots are primarily concentrated near the location of maximum antenna current distribution, meaning the SAR value is strongly correlated with the antenna current density, in the design of a 2.4G single-frequency antenna, parasitic stubs are added to the port-to-port antenna, such as... Figure 7 As shown, new stubs cause changes in the current distribution at the feed point, creating a reverse current cancellation effect. This also relates to the hotspot locations of the SAR values, such as... Figure 8 As shown, this will produce an equalization effect compared to before, which will reduce the SAR value.

[0053] Therefore, as Figure 9 As shown, for the current L1+2.4G WiFi+5G WiFi antenna scheme, a second branch (i.e., the second antenna stub 12) is designed to generate a current in the opposite direction to that of the original mode antenna (i.e., an example of the first antenna stub 11), which is used to cancel out part of the current of the original mode antenna, thereby reducing SAR. The implementation is as follows. Figure 10As shown, a new antenna resonant branch (an example of the second antenna branch 12, shown in the figure) is introduced near the feed of the L1+2.4Gwifi+5Gwifi antenna (i.e., an example of the first antenna branch 11, the original antenna branch shown in the figure). This branch can be implemented using FPC / LDS / metal frame material. The branch is implemented by coupling the grounding spring 1 + LDS / FPC / metal frame to the end part of the original antenna. Because the L1+2.4Gwifi+5Gwifi antenna is a multi-band antenna, after adding the second branch, while shunting current in a specific frequency band, it is necessary to ensure that it does not significantly affect other frequency bands. Therefore, a spring 2 (an example of the second spring 62) + LC filter frequency selection circuit is added near the end of the second branch. The function of this device is to perform frequency selection design in the frequency band where SAR reduction is required, so that the FPC / LDS / metal frame antenna can achieve current distribution shunting for a specific frequency band. The device generally uses a small capacitor.

[0054] Of course, the LC filter design at point 2 is not limited to a small capacitance state; other types of designs are also possible. In this example, the SAR reduction effect for 5G Wi-Fi-LH / RH is as follows: in the 5G Wi-Fi band (5.1-5.8GHz), the LH / RH-eff performance is improved by 0.5dB-3.78dB compared to the original, and the new solution can reduce LH / RH-SAR by approximately 17-36%.

[0055] However, the method of adding a second branch to reduce human SAR also has certain limitations. Because 5G WiFi has a sufficiently wide bandwidth, although it can achieve a significant SAR reduction effect, the bandwidth affected by the branch used for SAR reduction is still somewhat limited. In this example, the SAR reduction effect of 5G WiFi-5mm-body-frontside is as follows: with a 1.5dB-2dB improvement in body-eff performance in the 5G WiFi band (5.2-5.85GHz) compared to the original, the new 5mm-body-frontside SAR solution can reduce SAR by approximately 20-38%, but its effective range is 5.2G-5.6G, therefore it still cannot cover the full bandwidth of 5.2G-5.9G. In this case, technologies such as L / C networks or switch switching can be used to achieve WiFi channel fallback or frequency selection to address the bandwidth issue under the head and human body.

[0056] In this embodiment, a new antenna stub is designed to generate a current that is opposite to that of the original antenna, which is used to cancel out part of the current of the original antenna, thereby reducing SAR.

[0057] From a design perspective, optimizing the size of the second branch and the design of the LC filter network / switch can effectively solve the bottleneck problem of SAR reduction in broadband antennas. In this example, with a bandwidth of 800-900MHz, the SAR reduction effect can reach 17%-36%. The size of the LDS / FPC / metal frame and the design of the LC filter network / switch can be adjusted according to the actual situation to ensure the SAR reduction resonant physical size in the required frequency band.

[0058] The solution provided in this application is not only applicable to mobile phone antennas, but also to other terminal products such as watches, PCs and other terminal products.

[0059] In the embodiments of this application, depending on the operating frequency band, the LC filter at spring 2 can also be a multi-stage filter structure design. It is not limited to a lumped inductor and capacitor implementation. Custom components or printed circuits can also be used to implement the filtering characteristics.

[0060] In this embodiment, the L / C network at the spring 2 can also be a switchable device to achieve the switching function of the resonant branch power-saving length, so as to cooperate with the design of targeted reduction of SAR effect in the sub-channel;

[0061] In the embodiments of this application, the second branch LDS is not limited to any form and is protected under this application. For example, the second branch can also be a metal frame, FPC, or other design forms.

[0062] In this application embodiment, the SAR reduction effect of the 5G WiFi antenna in this example is not limited to that of this example, and can be extended to single-frequency or multi-frequency SAR reduction, such as 5G NR and other frequency bands.

[0063] This application provides an electronic device. Figure 11 This is a schematic diagram of the structure of the electronic device provided in the embodiments of this application, such as... Figure 11 As shown, the electronic device 11 includes an antenna device with any of the structures described in this application; wherein, during implementation, the electronic device can be various types of devices with communication capabilities, such as mobile phones, watches, laptops, tablets, personal computers, drones, robots, televisions or projectors, etc.

[0064] It should be understood that the phrases "one embodiment," "an embodiment," or "some embodiments" mentioned throughout the specification mean that a specific feature, structure, or characteristic related to an embodiment is included in at least one embodiment of this application. Therefore, "in one embodiment," "in one embodiment," or "in some embodiments" appearing throughout the specification do 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 for descriptive purposes and do not represent the superiority or inferiority of the embodiments. The descriptions of the various embodiments above tend to emphasize the differences between the various embodiments; their similarities or commonalities can be referred to mutually, and for the sake of brevity, they will not be repeated here.

[0065] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that there can be three kinds of relationships. For example, object A and / or object B can represent three situations: object A exists alone, object A and object B exist simultaneously, and object B exists alone.

[0066] 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, article, 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, article, or apparatus. Unless otherwise specified, 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.

[0067] The devices disclosed in the several device embodiments provided in this application can be arbitrarily combined without conflict to obtain new device embodiments.

[0068] The features disclosed in the several product embodiments provided in this application can be arbitrarily combined without conflict to obtain new product embodiments.

[0069] The features disclosed in the several device or equipment embodiments provided in this application can be arbitrarily combined without conflict to obtain new device or equipment embodiments.

[0070] 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 device, characterized by The device includes: a first antenna stub and a second antenna stub; wherein... Both the first end of the first antenna stub and the first end of the second antenna stub are grounded; The second end of the first antenna stub is coupled to the second end of the second antenna stub; The current phase of the second antenna stub is opposite to that of the first antenna stub, thereby canceling out part of the current in the first antenna stub to reduce SAR. The device further includes a first adjustment circuit; a first terminal of the first adjustment circuit is grounded, and a second terminal of the first adjustment circuit is electrically connected to a first portion of the second antenna stub; the first portion does not include the end of the second antenna stub. The first adjustment circuit is used to adjust the working length of the second antenna stub in order to reduce the SAR generated by the current working frequency band of the first antenna stub; The first adjustment circuit includes a switching circuit, which is used for: In response to a first adjustment command, the electrical connection between the first part of the second antenna stub and ground is turned on or off, thereby adjusting the working length of the second antenna stub; wherein, the first adjustment command is generated based on the correspondence between the current working frequency band of the first antenna stub and the working length supported by the second antenna stub.

2. The apparatus of claim 1, wherein, The device further includes a second adjustment circuit; a first terminal of the second adjustment circuit is grounded, and a second terminal of the second adjustment circuit is electrically connected to a second portion of the second antenna stub; the second portion does not include the end of the second antenna stub. The first adjustment circuit and the second adjustment circuit are used to jointly adjust the working length of the second antenna stub in order to reduce the SAR generated by the current working frequency band of the first antenna stub.

3. The apparatus of claim 1, wherein, The first adjustment circuit includes an LC filter network, which is used to adjust the operating length of the second antenna stub to reduce the SAR generated by the current operating frequency band of the first antenna stub.

4. The apparatus according to any one of claims 1 to 3, characterized in that, The second antenna stub is manufactured using LDS, FPC, or a metal frame.

5. The apparatus according to claim 1, characterized in that, The device also includes a first spring clip; The first end of the first spring is grounded, and the second end of the first spring is electrically connected to the first end of the second antenna stub, thereby grounding the first end of the second antenna stub.

6. The apparatus according to claim 1, characterized in that, The device also includes a second spring; The first end of the second spring is grounded, and the second end of the second spring is electrically connected to the first end of the first adjustment circuit, thereby grounding the first end of the first adjustment circuit.

7. The apparatus according to claim 1, characterized in that, The first antenna stub supports multiple different wireless frequency bands.

8. An electronic device, characterized in that, Includes the antenna device according to any one of claims 1 to 7.

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