Electronic device
By employing a combined structure of a first radiator, a second radiator, and a third radiator in the electronic device and controlling it with a grounding switch, SAR is reduced without increasing the size of the device, while maintaining good radiation performance and frequency band coverage, thus solving the problem of high SAR among multiple antennas.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- VIVO MOBILE COMM CO LTD
- Filing Date
- 2023-08-21
- Publication Date
- 2026-07-21
AI Technical Summary
The high specific absorption rate (SAR) among multiple antennas in existing electronic devices leads to a significant impact on the human body, and it is difficult to balance SAR reduction and radiation performance of multiple antennas without increasing the size of the device.
By employing a combined structure of a first radiator, a second radiator, and a third radiator, and controlling the grounding switch, the radiators are reused and the current distribution is optimized to form the first antenna, thereby reducing SAR while maintaining the radiation frequency band and performance of the equipment.
Without increasing the size of the equipment, the SAR of the first antenna is significantly reduced, while taking into account the low SAR and good radiation performance of multiple antennas, and ensuring coverage and radiation efficiency of the radiation band.
Smart Images
Figure CN116895937B_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of electronic technology, specifically relating to an electronic device. Background Technology
[0002] With the continuous development of electronic technology, electronic devices are increasingly widely used in people's lives. Current electronic devices often have multiple radiators, and some of these radiators typically have a high Specific Absorption Ratio (SAR), leading to a greater impact on the human body. To reduce the SAR of these radiators, it is usually necessary to increase their aperture. Therefore, it is difficult to simultaneously address the issue of multiple antennas in current electronic devices and the need to reduce SAR for some of them. Summary of the Invention
[0003] This application aims to provide an electronic device that solves the problem of the difficulty in simultaneously addressing the SAR reduction requirements of multiple antennas and some antennas within those multiple antennas.
[0004] To solve the above-mentioned technical problems, this application is implemented as follows:
[0005] This application provides an electronic device comprising: a floor, a first radiator, a second radiator, a third radiator, a grounding switch, a first power supply structure, and a second power supply structure. The second radiator is located between the first radiator and the third radiator. A first gap exists between the second radiator and the first radiator, and a second gap exists between the second radiator and the third radiator. The second radiator is coupled to the first radiator through the first gap, and the second radiator is coupled to the third radiator through the second gap. A first connection point of the second radiator is connected to the floor through the grounding switch, and a second connection point of the second radiator is connected to the floor. The second connection point is located between the first connection point and an end of the second radiator near the first radiator. The second radiator is connected to the first power supply structure, and the third radiator is connected to the second power supply structure.
[0006] When the grounding switch is in the open state, the first radiator, the second radiator, and the third radiator constitute the first antenna.
[0007] In the embodiments of this application, the second radiator and the first radiator can reuse the third radiator and together with the third radiator form the first antenna. In this way, the aperture of the third radiator can be reused, and the purpose of reducing the SAR of the first antenna can be achieved without increasing the size of the electronic device, thereby reducing the impact on the human body. At the same time, the electronic device is also provided with the first radiator, the second radiator and the third radiator, so that the electronic device can take into account both multiple radiators and low SAR of the first antenna.
[0008] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description
[0009] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:
[0010] Figure 1 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application;
[0011] Figure 2 This is a schematic diagram of the current distribution of various radiators on an electronic device provided in an embodiment of this application;
[0012] Figure 3 This is one of the state diagrams of the electronic device provided in the embodiments of this application;
[0013] Figure 4 This is the second schematic diagram of the state of the electronic device provided in the embodiments of this application;
[0014] Figure 5 This is a schematic diagram of the structure of another electronic device provided in an embodiment of this application;
[0015] Figure 6 This is a schematic diagram of the structure of another electronic device provided in an embodiment of this application;
[0016] Figure 7 This is a schematic diagram of the structure of another electronic device provided in an embodiment of this application;
[0017] Figure 8 This is a schematic diagram of the isolation between a second antenna and a third antenna in an electronic device provided in an embodiment of this application. Detailed Implementation
[0018] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.
[0019] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.
[0020] See Figure 1 , Figure 1 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application, such as... Figure 1 As shown, the electronic device includes: a floor 10, a first radiator 20, a second radiator 30, a third radiator 40, a grounding switch 50, a first power supply structure 60, and a second power supply structure 70. The second radiator 30 is located between the first radiator 20 and the third radiator 40. A first gap 301 exists between the second radiator 30 and the first radiator 20, and a second gap 302 exists between the second radiator 30 and the third radiator 40. The second radiator 30 and the first radiator 20 are coupled together through the first gap 301. The second radiator 30 and the third radiator 40 are coupled together through the second gap 302. The first connection point 303 of the second radiator 30 is connected to the floor 10 through the grounding switch 50, and the second connection point 304 of the second radiator 30 is connected to the floor 10. The second connection point 304 is located between the first connection point 303 and the end of the second radiator 30 near the first radiator 20. The second radiator 30 is connected to the first power supply structure 60, and the third radiator 40 is connected to the second power supply structure 70.
[0021] Among them, see Figure 3 When the grounding switch 50 is in the open state, the first radiator 20, the second radiator 30 and the third radiator 40 constitute the first antenna 100.
[0022] It should be noted that when the grounding switch 50 is in the open state, the first radiator 20, the second radiator 30 and the third radiator 40 constitute the first antenna 100, and the main feeding structure of the first antenna 100 is the first feeding structure 60.
[0023] The working principle of the embodiments of this application can be found in the following description:
[0024] The second radiator 30 and the first radiator 20 can reuse the third radiator 40, forming the first antenna 100 together. This allows for the reuse of the aperture of the third radiator 40, reducing the SAR of the first antenna 100 without increasing the size of the electronic device, thus minimizing its impact on the human body. Simultaneously, the electronic device also incorporates the first radiator 20, the second radiator 30, and the third radiator 40, enabling it to balance multiple radiators and low SAR with the first antenna 100. Furthermore, it ensures a wide radiation frequency band and good radiation performance, without reducing the radiation frequency band or lowering the radiation performance. Therefore, the electronic device in this embodiment simultaneously meets the requirements of small aperture, multiple antennas, few gaps (less than or equal to two gaps), and low SAR.
[0025] It should be noted that when the grounding switch 50 is in the open state, the schematic diagram of the current distribution of each radiator in the first antenna 100 can be found in [reference needed]. Figure 2 As shown, according to Figure 2 It is known that the distributed current on the second radiator 30, between the second connection point 304 and the portion of the second radiator 30 near the third radiator 40, is opposite to the distributed current at other locations. This can partially cancel out the induced magnetic field generated at other locations, thereby reducing the SAR of the first antenna 100 and reducing its impact on the human body.
[0026] It should be noted that, for a clearer illustration of the embodiments of this application, please refer to [link / reference needed]. Figure 2 The first radiator 20 can be referred to as PE1, the third radiator 40 can be referred to as PE2, the portion of the second radiator 30 between the second connection point 304 and the end of the second radiator 30 near the first radiator 20 can be referred to as ME1, and the portion of the second radiator 30 between the second connection point 304 and the end of the second radiator 30 near the third radiator 40 can be referred to as ME2. See also... Figure 1 The end of the first radiator 20 that is away from the second radiator 30 can be referred to as G1, the end of the third radiator 40 that is away from the second radiator 30 can be referred to as G3, the second connection point 304 can be referred to as G2, and the above G1, G2 and G3 can all be referred to as the connection point.
[0027] The first power supply structure 60 can be connected to the third connection point on the second radiator 30. The third connection point can be located between the end of the second radiator 30 near the first radiator 20 and the second connection point 304. The second power supply structure 70 can be connected to the fourth connection point on the third radiator 40. The fourth connection point can be located between the end of the third radiator 40 near the second radiator 30 and the end of the third radiator 40 away from the second radiator 30.
[0028] Among them, the grounding switch 50 can be referred to as the SW1 switch.
[0029] As an optional implementation method, see [link to implementation details]. Figure 4 When the grounding switch 50 is in the closed state, the first radiator 20 and the first part 31 of the second radiator 30 constitute the second antenna 200, and the second part 32 of the second radiator 30 and the third radiator 40 constitute the third antenna 300. The first part 31 is the part between the first connection point 303 and the end of the second radiator 30 near the first radiator 20, and the second part 32 is the part between the first connection point 303 and the end of the second radiator 30 near the third radiator 40.
[0030] In this embodiment of the application, when the grounding switch 50 is in the closed state, the first radiator 20 and the first part 31 of the second radiator 30 constitute the second antenna 200, and the second part 32 of the second radiator 30 and the third radiator 40 constitute the third antenna 300. In this way, the second antenna 200 and the third antenna 300 can work independently, and both the second antenna 200 and the third antenna 300 can be in the HB frequency band. When the grounding switch 50 is in the closed state, that is, when the grounding switch 50 is in the grounding state, the co-frequency isolation of the second antenna 200 and the third antenna 300 can be increased.
[0031] It should be noted that when the first antenna 100 or the second antenna 200 is working, the first antenna 100 and the second antenna 200 are in different frequency bands, which enables the electronic device to have multiple functions.
[0032] It should be noted that when the antenna of an electronic device is in the B40 or B41 frequency band, and the electronic device has no need to reduce SAR, or the SAR reduction required is small, the second antenna 200 and the third antenna 300 can be controlled to work independently to enhance the radiation performance of the electronic device.
[0033] It should be noted that the first antenna 100 can cover the main frequencies of MB (B3 (1.71GHz-1.88GHz), B1 (1.92GHz-2.17GHz)), while the second antenna 200 can cover the main frequencies of HB (B40 (2.3GHz-2.5GHz), B41 (2.5GHz-2.69GHz)). The third antenna 300 can cover the main frequencies of WIFI (including part of the 2.4G range, i.e. (2.4GHz-2.5GHz)) and some 5G NR (N41 (2.5GHz-2.69GHz), N78 (3.3GHz-3.8GHz)) bands.
[0034] Referring to Tables 1 to 3, in Table 1, the SAR value of the electronic device in the relevant reference scheme when operating in the B3 band exceeds 2, and is still significantly higher than other bands after normalization to 18 dBm of radiated power. Using the electronic device in this embodiment, the B3 normalized SAR value is reduced to 1.04, a reduction of 2.8 dB compared to the relevant schemes, demonstrating a significant SAR reduction effect.
[0035] Furthermore, referring to Table 2, the in-band efficiency of the second antenna 200 is basically maintained while achieving better SAR reduction performance as shown in Table 1. Table 3 shows that the efficiency of the third antenna 300 in each frequency band remains at the level of the relevant schemes. That is, by using the electronic equipment in the embodiments of this application, the radiation efficiency of both the second antenna 200 and the third antenna 300 can be relatively high.
[0036] Additionally, see Figure 8 , Figure 8 Curve A represents the co-channel isolation between the second antenna 200 and the third antenna 300 in the embodiments of this application, while curve B is used to represent the co-channel isolation between the second antenna 200 and the third antenna 300 in related schemes. Figure 8 As can be seen, in this embodiment of the application, the co-frequency isolation between the second antenna 200 and the third antenna 300 (the second antenna 200 is in B40 and the third antenna 300 is in WIFI) is greater than 15dB, which is significantly better than the isolation in related schemes.
[0037] Table 1. Beneficial effects of this application's embodiments on SAR reduction (mainly for the B3 band).
[0038]
[0039] Table 2 Comparison of the second antenna efficiency of the embodiments of this application and the reference scheme.
[0040]
[0041] Table 3 Comparison of the third antenna efficiency of the embodiments in this application and related schemes
[0042]
[0043] As an optional implementation, the end of the first radiator 20 away from the second radiator 30 is connected to the floor 10, and the end of the third radiator 40 away from the second radiator 30 is connected to the floor 10.
[0044] In this embodiment of the application, the end of the first radiator 20 that is away from the second radiator 30 is connected to the floor 10, and the end of the third radiator 40 that is away from the second radiator 30 is connected to the floor 10.
[0045] As an optional implementation, when the grounding switch 50 is in the open state, the portion of the second radiator 30 between the second connection point 304 and the end of the second radiator 30 near the first radiator 20 forms a first slot antenna with the first radiator 20 and is in common mode.
[0046] The first radiator 20 can be referred to as a 1 / 4 monopole stub resonating in the HB band. It obtains coupled energy from ME1 (i.e., the portion of the second radiator 30 between the second connection point 304 and the end of the second radiator 30 near the first radiator 20) through the first gap 301. The energy of ME1 (i.e., the portion of the second radiator 30 between the second connection point 304 and the end of the second radiator 30 near the first radiator 20) can come from the first feed structure 60. In the MB band, the combination of the first radiator 20 and ME1 (i.e., the portion of the second radiator 30 between the second connection point 304 and the end of the second radiator 30 near the first radiator 20) constitutes a slot common mode, which is the common mode of the first slot antenna.
[0047] It should be noted that the current mode on ME1 is 1 / 4 inverted-F antenna (IFA) mode.
[0048] In this embodiment, the first radiator 20 and ME1 (i.e., the part between the second connection point 304 and the end of the second radiator 30 near the first radiator 20 on the second radiator 30) constitute the common mode of the first slot antenna, which can ensure that the radiation performance of the first slot antenna is good.
[0049] As an optional implementation, when the grounding switch 50 is in the open state, the distributed current on the second radiator 30, between the second connection point 304 and the end of the second radiator 30 near the first radiator 20, is in the same direction as the distributed current on the first radiator 20.
[0050] In this embodiment, the direction of the distributed current on the first radiator 20 and ME1 (i.e., the portion of the second radiator 30 between the second connection point 304 and the end of the second radiator 30 near the first radiator 20) is the same.
[0051] In this embodiment, since the direction of the distributed current on the first radiator 20 and ME1 (i.e., the portion of the second radiator 30 between the second connection point 304 and the end of the second radiator 30 near the first radiator 20) is the same, the radiated signals of the first radiator 20 and ME1 (i.e., the portion of the second radiator 30 between the second connection point 304 and the end of the second radiator 30 near the first radiator 20) are oriented in the same direction. This ensures that the radiation performance of the first slot antenna is good.
[0052] As an optional implementation, when the grounding switch 50 is in the open state, the distributed current on the second radiator 30, between the second connection point 304 and the end of the second radiator 30 near the first radiator 20, is opposite to the distributed current on the portion between the second connection point 304 and the end of the second radiator 30 near the third radiator 40, and constitutes a common-mode mode for the line antenna.
[0053] In this embodiment, since the distributed current on the second radiator 30, between the second connection point 304 and the end of the second radiator 30 near the first radiator 20, is opposite to the distributed current on the second connection point 304 and the end of the second radiator 30 near the third radiator 40, the SAR of the first antenna 100 can be reduced, thereby reducing harm to the human body.
[0054] As an optional implementation, when the grounding switch 50 is in the open state, the portion of the second radiator 30 between the second connection point 304 and the end of the second radiator 30 near the third radiator 40 forms a second slot antenna with the third radiator 40 and is in differential mode.
[0055] The third radiator 40 is a 1 / 4 monopole stub with a resonant frequency lower than the MB operating frequency band. It obtains coupled energy from ME2 (i.e., the portion of the second radiator 30 between the second connection point 304 and the end of the second radiator 30 near the third radiator 40) through the second gap 302. In the MB frequency band, the combination of the third radiator 40 and ME2 (i.e., the portion of the second radiator 30 between the second connection point 304 and the end of the second radiator 30 near the third radiator 40) constitutes the slot differential mode, i.e., the differential mode of the second slot antenna.
[0056] In this embodiment, since the third radiator 40 and ME2 (i.e., the part between the second connection point 304 and the end of the second radiator 30 near the third radiator 40 on the second radiator 30) are combined to form a slot differential mode, that is, the differential mode of the second slot antenna, it can be ensured that when working in MB state, the current of the first antenna 100 on the third radiator 40 is in the same direction as ME1, and the overall radiation performance is better.
[0057] As an optional implementation, when the grounding switch 50 is in the open state, the distributed current on the second radiator 30, on the portion between the second connection point 304 and the end of the second radiator 30 near the third radiator 40, is opposite to the distributed current of the third radiator 40.
[0058] The distributed current of the third radiator 40 is in the same direction as the distributed current of the first radiator 20.
[0059] That is, the distributed current on ME2 (i.e., the portion of the second radiator 30 between the second connection point 304 and the end of the second radiator 30 near the third radiator 40) is opposite to the distributed current on the third radiator 40, and the direction of the distributed current on the third radiator 40 can be the same as that of ME1 (i.e., the portion of the second radiator 30 between the second connection point 304 and the end of the second radiator 30 near the first radiator 20) and the distributed current on the first radiator 20. That is, the direction of the distributed current on ME2 (i.e., the portion of the second radiator 30 between the second connection point 304 and the end of the second radiator 30 near the third radiator 40) is opposite to that of ME1 (i.e., the portion of the second radiator 30 between the second connection point 304 and the end of the second radiator 30 near the first radiator 20) and the distributed current on the first radiator 20.
[0060] In this embodiment, when the distributed current on ME2 (i.e., the portion of the second radiator 30 between the second connection point 304 and the end of the second radiator 30 near the third radiator 40) is opposite to the distributed current on the third radiator 40, that is, when the distributed current on ME2 (i.e., the portion of the second radiator 30 between the second connection point 304 and the end of the second radiator 30 near the third radiator 40) is opposite to the distributed current on ME1 (i.e., the portion of the second radiator 30 between the second connection point 304 and the end of the second radiator 30 near the first radiator 20), the magnetic field generated by ME2 (i.e., the portion of the second radiator 30 between the second connection point 304 and the end of the second radiator 30 near the third radiator 40) can relatively cancel out the magnetic field generated by ME1 (i.e., the portion of the second radiator 30 between the second connection point 304 and the end of the second radiator 30 near the first radiator 20), thereby effectively reducing the near-field electromagnetic radiation energy density near the first gap 301, thereby achieving the effect of reducing SAR and reducing harm to the human body.
[0061] It should be noted that ME2 (i.e., the part of the second radiator 30 between the second connection point 304 and the end of the second radiator 30 near the third radiator 40) is a 1 / 4 monopole stub with a resonant frequency slightly higher than the MB operating frequency band. It is grounded through the second connection point 304 and obtains coupling energy from ME1 (i.e., the part of the second radiator 30 between the second connection point 304 and the end of the second radiator 30 near the first radiator 20). In the MB band, the direction of the distributed current on ME2 (i.e., the portion of the second radiator 30 between the second connection point 304 and the end of the second radiator 30 near the third radiator 40) is opposite to the direction of the distributed current on ME1 (i.e., the portion of the second radiator 30 between the second connection point 304 and the end of the second radiator 30 near the first radiator 20). It should be noted that if the resonant frequency of ME2 (i.e., the portion of the second radiator 30 between the second connection point 304 and the end of the second radiator 30 near the third radiator 40) is low, the direction of the distributed current on ME1 (i.e., the portion of the second radiator 30 between the second connection point 304 and the end of the second radiator 30 near the third radiator 40) will be different. The phase difference between the current of ME1 (i.e., the portion of the second radiator 30 between the second connection point 304 and the end of the second radiator 30 near the first radiator 20) and ME2 (i.e., the portion of the second radiator 30 between the second connection point 304 and the end of the second radiator 30 near the first radiator 20) may be less than 180°. Observing the current dynamics, ME1 (i.e., the portion of the second radiator 30 between the second connection point 304 and the end of the second radiator 30 near the first radiator 20) and ME2 (i.e., the portion of the second radiator 30 between the second connection point 304 and the end of the second radiator 30 near the third radiator 40) exhibit an alternating characteristic. Electronic devices in this state may still have SAR reduction effect.
[0062] It should be noted that the closer the operating frequency of each radiator is to its resonant frequency, the stronger the distributed current on that radiator. That is, fine-tuning the length of each radiator and the tuning element on each radiator may cause a change in the distributed current on each radiator. The resonant frequency can be understood as the frequency under ideal operating conditions, while the operating frequency can be understood as the actual operating frequency.
[0063] As an optional implementation, the grounding switch 50 is connected to the floor 10 via a first matching tuning circuit.
[0064] In this embodiment, the grounding switch 50 is connected to the floor 10 through a first matching tuning circuit, which allows adjustment of the operating frequency band on the second radiator 30, thereby further improving the radiation performance of the second radiator 30.
[0065] As an alternative implementation, the first radiator 20 is connected to the floor 10 via a second matching tuning circuit between the end of the first radiator 20 and the end of the second radiator 30 that is far from the second radiator 30 and the end of the second radiator 30 that is near the second radiator 30.
[0066] The first radiator 20 can be located close to the battery of the electronic device.
[0067] In this embodiment, the end of the first radiator 20 that is far from the second radiator 30 and the end of the first radiator 20 that is close to the second radiator 30, i.e., the two ends of the first radiator 20, are connected to the floor 10 through a second matching tuning circuit. In this way, the operating frequency band of the first radiator 20 can be adjusted, thereby further improving the radiation performance of the first radiator 20.
[0068] As an alternative implementation, the third radiator 40 is connected to the floor 10 via a third matching tuning circuit between the end of the third radiator 40 that is away from the second radiator 30 and the end of the third radiator 30 that is close to the second radiator 30.
[0069] In this embodiment, the end of the third radiator 40 that is far from the second radiator 30 and the end of the third radiator 40 that is close to the second radiator 30 are connected to the floor 10 through a third matching tuning circuit. In this way, the operating frequency band of the third radiator 40 can be adjusted, thereby further improving the radiation performance of the third radiator 40.
[0070] It should be noted that the specific structures of the first matching tuning circuit, the second matching tuning circuit, and the third matching tuning circuit are not limited here. Optionally, the first matching tuning circuit, the second matching tuning circuit, and the third matching tuning circuit may include at least one of the following components: a tuning capacitor and a tuning inductor.
[0071] As an optional implementation method, see [link to implementation details]. Figure 5 , Figure 6 and Figure 7 The electronic device also includes a frame 500, wherein the first radiator 20, the second radiator 30 and the third radiator 40 are all located on the side 501 of the frame 500.
[0072] Among them, see Figure 5 , Figure 5 The side portion 501 of the middle frame 500 can be divided into a first quadrant, a second quadrant, a third quadrant, and a fourth quadrant, and at least one of the first quadrant, the second quadrant, the third quadrant, and the fourth quadrant can be simultaneously provided with a first radiator 20, a second radiator 30, and a third radiator 40.
[0073] The side 501 of the frame 500 can refer to the side frame with the power button or volume control button, or the side frame opposite to the side frame with the power button or volume control button.
[0074] In this embodiment, since the first radiator 20, the second radiator 30 and the third radiator 40 are all located on the side 501 of the frame 500, there is a good radiation environment when the electronic device is held horizontally by the user (such as in a landscape game scenario) and the user's head and hand position (such as in a phone call scenario), which can ensure that the radiation performance of the electronic device is good.
[0075] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0076] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.
Claims
1. An electronic device, characterized in that, include: The system comprises a floor, a first radiator, a second radiator, a third radiator, a grounding switch, a first power supply structure, and a second power supply structure. The second radiator is located between the first radiator and the third radiator. A first gap exists between the second radiator and the first radiator, and a second gap exists between the second radiator and the third radiator. The second radiator is coupled to the first radiator through the first gap, and the second radiator is coupled to the third radiator through the second gap. A first connection point of the second radiator is connected to the floor through the grounding switch, and a second connection point of the second radiator is connected to the floor. The second connection point is located between the first connection point and the end of the second radiator near the first radiator. The second radiator is connected to the first power supply structure, and the third radiator is connected to the second power supply structure. When the grounding switch is in the open state, the first radiator, the second radiator, and the third radiator constitute the first antenna; When the grounding switch is in the closed state, the first radiator and the first part of the second radiator constitute a second antenna, and the second part of the second radiator and the third radiator constitute a third antenna. The first part is the portion between the first connection point and the end of the second radiator near the first radiator, and the second part is the portion between the first connection point and the end of the second radiator near the third radiator.
2. The electronic device according to claim 1, characterized in that, The end of the first radiator away from the second radiator is connected to the floor, and the end of the third radiator away from the second radiator is connected to the floor.
3. The electronic device according to claim 2, characterized in that, When the grounding switch is in the open state, the portion of the second radiator between the second connection point and the end of the second radiator near the first radiator forms a first slot antenna with the first radiator and is in common mode.
4. The electronic device according to claim 3, characterized in that, When the grounding switch is in the open state, the distributed current on the second radiator, on the portion between the second connection point and the end of the second radiator near the first radiator, is in the same direction as the distributed current on the first radiator.
5. The electronic device according to claim 4, characterized in that, When the grounding switch is in the open state, the distributed current on the second radiator, on the portion between the second connection point and the end of the second radiator near the first radiator, is opposite to the distributed current on the portion between the second connection point and the end of the second radiator near the third radiator, and constitutes a common-mode mode for the line antenna.
6. The electronic device according to claim 2, characterized in that, When the grounding switch is in the open state, the portion of the second radiator between the second connection point and the end of the second radiator near the third radiator forms a second slot antenna with the third radiator and is in differential mode.
7. The electronic device according to claim 6, characterized in that, When the grounding switch is in the open state, the distributed current on the second radiator, between the second connection point and the end of the second radiator near the third radiator, is opposite to the distributed current of the third radiator.
8. The electronic device according to claim 1, characterized in that, The grounding switch is connected to the floor via a first matching tuning circuit.
9. The electronic device according to claim 2, characterized in that, The first radiator is connected to the floor via a second matching tuning circuit, between the end furthest from the second radiator and the end closest to the second radiator.
10. The electronic device according to claim 2, characterized in that, The third radiator is connected to the floor via a third matching tuning circuit, between the end furthest from the second radiator and the end closest to the second radiator.
11. The electronic device according to any one of claims 1 to 10, characterized in that, The electronic device also includes a frame, and the first radiator, the second radiator and the third radiator are all located on the side of the frame.