An electronic device

Abstract

The application discloses an electronic device, comprising: an antenna module, a coil and a control module, the coil is provided with an opening, the coil is arranged at a target position in the electronic device; wherein the target position is a position where a specific absorption rate (SAR) value exceeds a preset threshold in the electronic device when the antenna module works, which is determined according to the SAR test; the first end and the second end of the opening formed on the coil are connected with the control module; wherein in the case that the SAR value when the antenna module works is greater than the preset threshold, the control module controls the conduction between the first end and the second end.

Description

Technical Field

[0001] This application belongs to the field of electronic products, and specifically relates to an electronic device. Background Technology

[0002] With the continuous development of electronic devices, communication, as a crucial function of mobile phones and other electronic devices, is constantly improving its efficiency and signal strength. This inevitably leads to an increase in antenna power, thus increasing the risk of Specific Absorption Rate (SAR). Currently, the common method to reduce the SAR value of electronic devices is to incorporate SAR sensors within the device. When a person approaches the device at a certain distance, the SAR sensor detects the contact and reduces the device's transmission power, thereby lowering the SAR value. When the person moves away from the device, the transmission power returns to normal. However, this method relies on the coupling capacitance change between a suspended metal structure on the electronic device and the human body to interrupt the signal. Furthermore, the suspended metal area needs to be large enough to meet the detection requirements of the SAR sensor. Additionally, incorporating a SAR sensor requires compatibility with its circuit design, both of which increase the design complexity of the antenna. Moreover, the operation of the SAR sensor significantly impacts the antenna signal quality. Summary of the Invention

[0003] This application provides an electronic device to address the problems of high antenna design difficulty and significant impact on antenna signal quality in current SAR reduction methods for electronic devices.

[0004] To solve the above-mentioned technical problems, this application is implemented as follows:

[0005] This application provides an electronic device, including:

[0006] Antenna module;

[0007] A coil having an opening is disposed at a target position within the electronic device; wherein the target position is the position in the electronic device where the SAR value exceeds a preset threshold when the antenna module is operating, as determined by a specific absorption rate (SAR) test.

[0008] The control module is connected to both the first end and the second end of the coil that form the opening; wherein, when the SAR value of the antenna module is greater than a preset threshold when the antenna module is working, the control module controls the first end and the second end to conduct.

[0009] In this way, according to the above scheme of the present application, the target position in the electronic device where the SAR value exceeds the preset threshold when the antenna module works is determined according to the specific absorption rate SAR test, the coil with an opening is arranged at the target position, and the first end and the second end are controlled to be conducted by the control module when the SAR value when the antenna module works is greater than the preset threshold, so that the closed loop vortex coil formed by the coil surrounds the target position, and the eddy current effect is generated by the alternating electromagnetic field in the closed loop vortex coil to consume the local electromagnetic wave and thus convert it into heat energy to reduce the SAR value of the target position. The SAR sensor and the electromagnetic plate for detecting the proximity of the human body can be avoided, the influence on the antenna performance is small, and the problem that the current SAR reduction method of the electronic device has large antenna design difficulty and large influence on the antenna signal quality is solved. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 FIG. 1 shows a schematic diagram of an electronic device according to an embodiment of the present application;

[0011] Figure 2 FIG. 2 shows a schematic diagram of an electronic device according to an embodiment of the present application;

[0012] Figure 3 FIG. 3 shows a schematic diagram of a coil according to an embodiment of the present application;

[0013] Figure 4 FIG. 4 shows a schematic diagram of the bandwidth range of an antenna module according to an embodiment of the present application;

[0014] Figure 5 FIG. 5 shows a circuit schematic diagram of a control module according to an embodiment of the present application;

[0015] Figure 6 FIG. 6 shows a workflow diagram of an electronic device according to an embodiment of the present application. DETAILED DESCRIPTION

[0016] Exemplary embodiments of the present application will be described in greater detail below with reference to the accompanying drawings. Although exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present application can be more thoroughly understood and so that the scope of the present application can be accurately conveyed to those skilled in the art.

[0017] As shown in FIG. 1, an embodiment of the present application provides an electronic device, which includes an antenna module, a coil 1, and a control module 2. Figure 1

[0018] ​The coil 1 is provided with an opening, and the coil 1 is arranged at a target position in the electronic device; wherein the target position is determined according to a specific absorption rate (SAR) test, and the SAR value of the antenna module in the electronic device exceeds a preset threshold when the antenna module works.

[0019] The first end and the second end of the coil 1, at which the opening is formed, are connected with the control module; wherein when the SAR value of the antenna module exceeds the preset threshold when the antenna module works, the control module 2 controls the conduction between the first end and the second end.

[0020] The SAR value generally refers to the measurement data of the influence of the heat energy generated by the electromagnetic wave in the electronic device on the human body, which can be obtained by simulating the SAR test of the electronic device contacting the human body. Optionally, after the whole machine antenna of the electronic device is determined, the SAR test is performed on the assembled whole machine. During the SAR test, the positions in the electronic device, at which the SAR value exceeds the preset threshold when the antenna module works, i.e. the points at which the SAR value exceeds the standard, i.e. the SAR value reaches the range that is harmful to the human body, can be scanned out, and these positions in the electronic device, at which the SAR value will exceed the preset threshold when the antenna module works, i.e. the target positions, are marked.

[0021] Specifically, as shown in Figure 2 The coil 1 is provided with an opening, so that when the SAR value of the antenna module exceeds the preset threshold when the antenna module works, the control module 2 controls the conduction between the first end and the second end of the coil 1, so that the closed loop eddy current coil formed by the coil 1 surrounds the target position, so as to generate the eddy current effect (as shown in Figure 2 The arrow represents the direction of the current, and the "ten" represents the direction of the electromagnetic field) in the closed loop eddy current coil by the alternating electromagnetic field, consumes the local electromagnetic wave, and thus converts into heat energy to reduce the SAR value of the target position. When the SAR value of the antenna module is less than or equal to the preset threshold when the antenna module works, the first end and the second end of the coil 1 remain in a disconnected state, so as to avoid the influence of the eddy current effect on the antenna performance.

[0022] Optionally, SAR testing can determine the operating frequency band of the antenna module when the SAR value exceeds a preset threshold. This allows for pre-setting the control module 2 to control the conduction between the first and second ends of coil 1 when the antenna module operates in this frequency band, thereby reducing the SAR value. Alternatively, SAR testing can also determine the electromagnetic field strength when the SAR value exceeds a preset threshold. When a detection element such as a resistor detects that the electromagnetic field strength exceeds a preset threshold, the control module 2 can control the conduction between the first and second ends of coil 1 to reduce the SAR value. Alternatively, the control module 2 can control the conduction between the first and second ends of coil 1 according to the operating mode of the electronic device, such as when the handset is on (e.g., during a call when the user answers a phone call).

[0023] (Sound), the control module 2 can control the conduction between the first end and the second end of the coil 1, thereby reducing the SAR value in the call mode, etc., but the embodiments of this application are not limited thereto.

[0024] In the above scheme, based on the SAR test, the target location in the electronic device where the SAR value exceeds a preset threshold is determined when the antenna module is operating. A coil with an opening is installed at this target location, and when the SAR value of the antenna module is greater than the preset threshold, a signal is generated.

[0025] The control module controls the conduction between the first and second terminals, causing the closed-loop eddy current coil formed by the coils to surround the target position, thereby generating an eddy current effect through the alternating electromagnetic field within the closed-loop eddy current coil.

[0026] By consuming local electromagnetic waves and converting them into thermal energy to reduce the SAR value of the target location, the use of SAR sensors and electromagnetic plates for detecting human proximity can be avoided, and the impact on antenna performance is minimal. This solves the problems of high antenna design difficulty and significant impact on antenna signal quality in current SAR reduction methods for electronic devices.

[0027] 5. Optionally, such as Figure 3 As shown, in this embodiment of the application, the number of coils 1 in the electronic device is one or more, which can be determined according to the number of target locations determined by SAR testing, such as setting one coil 1 at each target location. Specifically, when there are multiple coils 1, the coil 1 can be controlled by one control module 2 or by multiple control modules 2 respectively, etc., and this embodiment of the application is not limited thereto.

[0028] Optionally, the coil 1 is disposed on a printed circuit board (PCB).

[0029] For example, the resonant frequency of the coil 1 can be determined by a vector network analyzer, so as to determine the size of the coil 1 and print the coil 1 on the PCB. Alternatively, the coil 1 can be a half-loop coil with an opening, such as a circular or polygonal shape.

[0030] 5Optionally, the coil 1 is located in an antenna clearance area of the antenna module, that is, a PCB is arranged in the antenna clearance area of the antenna module with a SAR reduction requirement, and the resonant frequency of the coil 1 can be determined based on a vector network analyzer, so as to determine the size of the coil 1, and print the coil 1 with the corresponding size on the PCB, so as to reduce the SAR of the antenna module in operation.

[0031] Optionally, the first end or the second end of the coil 1 forming the opening is grounded. Further optionally, in a case where the SAR of the antenna module in operation is less than or equal to a preset threshold, the control module 2 controls the first end and the second end of the coil 1 to be disconnected, and the coil 1 forms a parasitic antenna of the antenna module.

[0032] Specifically, in addition to scanning out the position of the electronic device where the SAR of the antenna module in operation exceeds the preset threshold during the SAR test, and determining the resonant frequency of the coil 1 based on a vector network analyzer, so as to determine the size of the coil 1, the length of the coil 1 can also be compared with the wavelength of the test frequency band, so that the coil 1 can be used as a parasitic antenna.

[0033] Optionally, the wavelength corresponding to the operating frequency band of the antenna module is an integer multiple of the length of the coil 1. For example, the length of the coil 1 is the same as the wavelength corresponding to the operating frequency band of the antenna module (here, the same can mean that the two are equal, or the difference between the two is small and approximately equal); or the length of the coil 1 is half of the wavelength corresponding to the operating frequency band of the antenna module; or the length of the coil 1 is one fourth of the wavelength corresponding to the operating frequency band of the antenna module, so that when the first end and the second end of the coil 1 are disconnected, the coil 1 can form a parasitic antenna of the antenna module, of course, the embodiments of the present application are not limited thereto.

[0034] For example, in the case that the SAR value of the antenna module in operation is less than or equal to a preset threshold, the control module 2 controls the first end and the second end of the coil 1 to be disconnected, that is, the coil 1 is in an open loop state, and since the first end or the second end of the coil 1 on which the opening is formed is grounded, the wire of the coil 1 at this time can be comparable to the wavelength of the antenna to mirror the antenna vibrator, so that the open loop coil 1 can form a parasitic antenna effect and resonate with the antenna module, as shown in Figure 4 The bandwidth range A1 of the antenna module and the bandwidth range A2 of the parasitic antenna are given, that is, the effective bandwidth of the antenna can be increased through the parasitic antenna, and the antenna radiation efficiency can be improved.

[0035] Optionally, as shown in Figure 2 and Figure 5 The control module 2 includes a magnetic field sensing unit 21, a switch unit 22 and a control unit 23.

[0036] The magnetic field sensing unit 21 is used for detecting the electromagnetic field intensity; the switch unit 22 is connected to the first end and the second end of the coil 1 on which the opening is formed; and the control unit 23 is connected to the magnetic field sensing unit 21 and the switch unit 22 respectively.

[0037] In the case that the electromagnetic field intensity is higher than a preset threshold, the control unit 23 outputs a first control signal to the switch unit 22, and the switch unit 22 is in a conduction state under the first control signal, and the first end and the second end of the coil 1 are in conduction; wherein the preset threshold is the electromagnetic field intensity when the SAR value of the antenna module in operation reaches a preset threshold.

[0038] Specifically, the electromagnetic field intensity when the SAR value exceeds the preset threshold can be obtained through the SAR test, and the electromagnetic field intensity when the SAR value reaches the preset threshold is determined as the preset threshold. In this way, the electromagnetic field intensity at the target position can be obtained by the magnetic field sensing unit 21 sensing the electromagnetic field intensity, and in the case that the electromagnetic field intensity is higher than the preset threshold, that is, the SAR value exceeds the preset threshold, the control unit 23 controls the switch unit 22 to be in conduction, so that the first end and the second end of the coil 1 are in conduction, so that the closed loop vortex coil formed by the coil 1 surrounds the target position, so as to generate eddy current effect through the alternating electromagnetic field in the closed loop vortex coil, consume local electromagnetic wave to convert into heat energy to reduce the SAR value of the target position, that is, the SAR sensor and the electromagnetic plate for detecting the proximity of the human body can be avoided, and the influence on the antenna performance is small.

[0039] Optionally, in the case that the electromagnetic field intensity is less than or equal to a preset threshold, the control unit 23 outputs a second control signal to the switch unit 22, the switch unit 22 is in an off state under the second control signal, the first end and the second end of the coil 1 are disconnected, and the coil 1 forms a parasitic antenna of the antenna module.

[0040] Specifically, in the case that the electromagnetic field intensity is less than or equal to a preset threshold, that is, the SAR value is less than or equal to a preset threshold, the control unit 23 controls the switch unit 22 to be disconnected, so that the first end and the second end of the coil 1 are disconnected, that is, the coil 1 is in an open loop state, and since the first end or the second end of the coil 1 on which the opening is formed is grounded, the wire of the coil 1 at this time can be comparable to the wavelength of the antenna, so as to mirror the antenna oscillator, so that the open loop coil 1 can form a parasitic antenna effect and resonate with the antenna module together, greatly increasing the effective bandwidth of the antenna and effectively improving the antenna radiation efficiency.

[0041] Optionally, the control unit 23 receives the electrical signal of the magnetic field sensing unit 21 (such as the voltage value or the current value of the electrical signal representing the electromagnetic field intensity detected by the magnetic field sensing unit 21), so that the control unit 23 can output a first control signal to the switch unit 22 in the case that the electromagnetic field intensity is higher than a preset threshold. For example, the control unit 23 can determine whether the electromagnetic field intensity is higher than the preset threshold by using a comparator or other devices configured by the control unit 23, or the control unit 23 can determine whether the electromagnetic field intensity is higher than the preset threshold by using a software mode, and the embodiments of the present application are not limited thereto.

[0042] Optionally, the switch unit 22 includes a single-pole single-throw switch (SPST) and a first resistor R1.

[0043] The first end of the first resistor R1 is connected to the first end of the coil 1 on which the opening is formed, the second end of the first resistor R1 is connected to the first end of the single-pole single-throw switch (SPST), and the second end of the single-pole single-throw switch (SPST) is connected to the second end of the coil 1 on which the opening is formed.

[0044] Optionally, the first resistor R1 is a patch resistor arranged on the PCB to reduce the space occupied by the first resistor R1 and reduce the influence on the antenna layout in the electronic device. Specifically, when the switch unit 22 is in the on state, the first end of the coil 1 is connected to the second end of the coil 1 through the first resistor R1 and the single-pole single-throw switch SPST, so that the coil 1 forms a closed-loop eddy current coil through the first resistor R1. The eddy current generated by the closed-loop eddy current coil generates heat through the first resistor R1, that is, electromagnetic waves are converted into heat energy to reduce the SAR value of the target position. When the switch unit 22 is in the off state, the first end of the coil 1 is disconnected from the second end of the coil 1, and the first end or the second end of the coil 1 is grounded, so that the open-loop coil 1 can form a parasitic antenna effect and resonate with the antenna module together, greatly increasing the effective bandwidth of the antenna and effectively improving the antenna radiation efficiency.

[0045] Optionally, the magnetic field intensity sensing function of the magnetic field sensing unit 21 can be realized by a magnetic sensitive resistor or other devices, etc. Figure 5 As shown in the figure, the magnetic field sensing unit 21 includes a second resistor R2, one end of the second resistor R2 inputs a central processing unit (CPU) control signal, and the other end is connected to the control unit 23. Specifically, the second resistor R2 is used as an electromagnetic field intensity sensing device in the electronic device to sense and measure the radiation electromagnetic field intensity when the SAR value of the electronic device exceeds the preset threshold.

[0046] The control unit 23 includes a modem, a first switch K1, a second switch K2, and a third resistor R3.

[0047] The first end of the first switch K1 is grounded, the second end of the first switch K1 is connected to the control end of the second switch K2 and the first end of the third resistor R3 respectively, the control end of the first switch K1 is connected to the magnetic field sensing unit 21, the first end of the second switch K2 is connected to the control end of the switch unit 22, and the second end of the second switch K2 is connected to the second end of the third resistor R3 and the modem respectively.

[0048] Wherein, in the case that the electromagnetic field intensity is higher than the preset threshold, the first switch K1 is in the off state and the second switch K2 is in the on state; the first 5 control signal output by the modem is transmitted to the switch unit 22 through the second switch K2, the switch unit 22 is in the on state, and the first end and the second end of the coil 1 are connected. Specifically, referring to the above embodiment, the switch unit 22 is in the on state under the action of the first control signal.

[0049] Specifically, taking the magnetic field sensing unit 21 including the second resistor R2 as an example, one end of the second resistor R2 inputs a CPU control signal, and the other end is connected to the control end of the first switch K1. When the electromagnetic field intensity is higher than a preset threshold, the CPU control signal is at a low level, at which time the first switch K1 is in an off state, and the second switch K2 is in a conductive state. In this way, the first control signal output by the modem can be transmitted to the switch unit 22 through the second switch K2, so that the switch unit 22 is in a conductive state, that is, the first end and the second end of the coil 1 are conductive, forming a closed loop eddy current coil to reduce the SAR value of the target position.

[0050] 5Optionally, when the electromagnetic field intensity is less than or equal to a preset threshold, the first switch K1 is in a conductive state and the second switch K2 is in an off state; the second control signal output by the modem is transmitted to the switch unit 22 through the third resistor R3, and the switch unit 22 is in an off state, the first end and the second end of the coil 1 are disconnected, and the coil 1 forms an open loop coil.

[0051] The coil 1 becomes a parasitic antenna of the antenna module. Specifically, referring to the above embodiment, the switch unit 220 is in an off state under the action of the second control signal.

[0052] Specifically, continuing to take the magnetic field sensing unit 21 including the second resistor R2 as an example, one end of the second resistor R2 inputs a CPU control signal, and the other end is connected to the control end of the first switch K1. When the electromagnetic field intensity is less than or equal to a preset threshold, the CPU control signal is at a low level, at which time the first switch K1 is in an off state, and the second switch K2 is in a conductive state. In this way, the first control signal output by the modem can be transmitted to the switch unit 22 through the second switch K2, so that the switch unit 22 is in a conductive state, that is, the first end and the second end of the coil 1 are conductive, forming a closed loop eddy current coil to reduce the SAR value of the target position.

[0053] high level, at which time the first switch K1 is in a conductive state and the second switch K2 is in an off state. In this way, the second control signal output by the modem is transmitted to the switch unit 22 through the third resistor R3, so that the switch unit 22 is in an off state, that is, the first end and the second end of the coil 1 are disconnected, forming an open loop coil. In the case where the first end or the second end of the coil 1 is grounded, the open loop coil 1 can form a parasitic antenna effect and resonate with the antenna module to increase the effective bandwidth of the antenna and effectively improve the antenna radiation efficiency.

[0054] Specifically, the switch unit 22 includes a single-pole single-throw switch SPST and a first resistor R1. The first end of the first resistor R1 is connected to the first end of the opening formed on the coil 1, the second end of the first resistor R1 is connected to the first end of the single-pole single-throw switch SPST, and the second end of the single-pole single-throw switch SPST is connected to the second end of the opening formed on the coil 1.

[0055] The control logic of the single-pole single-throw switch SPST is that when the first control signal output by the modem, i.e., the control signal Vctl is high, the single-pole single-throw switch SPST is in path 1, i.e., in a conductive state; and when the second control signal output by the modem, i.e., the control signal Vctl is low, the single-pole single-throw switch SPST is in path 2, i.e., in a disconnected state.

[0056] When the electromagnetic field intensity detected by the second resistor R2 is higher than a preset threshold, the CPU control signal is low, the first switch K1 is not conductive (i.e., the first switch K1 is disconnected), the second switch K2 is conductive, the modem outputs a high-level control signal Vctl to the single-pole single-throw switch SPST, and then the single-pole single-throw switch SPST selects path 1, so that the coil 1 is closed to form a closed-loop eddy current coil, and the eddy current generated by the closed-loop eddy current coil generates heat through the first resistor R1, i.e., electromagnetic waves are converted into heat energy to reduce the SAR value of the target position.

[0057] When the electromagnetic field intensity is less than or equal to the preset threshold, the CPU control signal is high, the first switch K1 is conductive, and the second switch K2 is not conductive (i.e., the second switch K2 is disconnected), the modem outputs a low-level control signal Vctl to the single-pole single-throw switch SPST, and then the single-pole single-throw switch SPST selects path 2, and the coil 1 is open to form an open-loop coil. At this time, because the wire of the coil 1 is comparable to the wavelength of the antenna, the coil 1 can form a parasitic antenna effect and resonate with the antenna module, greatly increasing the effective bandwidth of the antenna and effectively improving the antenna radiation efficiency.

[0058] The control process of the electronic device in the embodiment of the application will be described below in combination with a specific application scenario, as shown in FIG. 1. Figure 6 As shown in FIG. 1, when the earpiece of the electronic device is turned on (such as in a call mode, a user answers a phone or voice, etc.), if it is determined that the SAR value exceeds a preset threshold (such as can be determined by detecting the electromagnetic field intensity of the radiation through the magnetic field induction unit, etc.), the single-pole single-throw switch SPST is controlled to be conductive (i.e., the single-pole single-throw switch SPST is closed), the coil 1 forms a closed-loop eddy current coil to generate eddy current, and the first resistor R1 connected in series in the coil converts electromagnetic waves into heat energy. If it is determined that the SAR value does not exceed the preset threshold, the single-pole single-throw switch SPST is controlled to be disconnected, and the coil 1 is open as a parasitic antenna, which can improve the bandwidth of the antenna and effectively improve the antenna radiation efficiency.

[0059] Traditional SAR reduction schemes often achieve this through full power back-off, typically requiring a 3-5dB back-off, resulting in significant sacrifices in transmit power and a substantial impact on antenna signal quality. The scheme described in this application can precisely reduce SAR at locations where the SAR point exceeds the limit, affecting TRP by approximately 1-2dB. This avoids the 3-5dB full power back-off approach of traditional SAR sensors, ensuring antenna radiation efficiency. Furthermore, in non-SAR applications, it can evolve into a parasitic antenna, effectively increasing antenna bandwidth and improving antenna efficiency. Moreover, this scheme effectively saves on SAR reduction sensor chips, reducing hardware circuit costs, simplifying hardware circuit design, and saving PCB layout space. In addition, this application is applicable to 4G antenna scenarios, as well as 5G multi-antenna electronic devices and WIFI-only electronic devices, maximizing performance across application scenarios and reducing the harm to users caused by electronic devices.

[0060] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0061] Although preferred embodiments of the present application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the embodiments of the present application.

[0062] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device 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 terminal device. 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 terminal device that includes said element.

[0063] The above describes the preferred embodiments of this application. It should be noted that those skilled in the art can make several improvements and modifications without departing from the principles described in this application, and these improvements and modifications are also within the protection scope of this application.

Claims

1. An electronic device, comprising: The application relates to an antenna module, a coil, a control module, and a magnetic field induction unit. The coil is provided with an opening and is arranged at a target position in the electronic device; wherein the target position is a position where a specific absorption rate (SAR) value exceeds a preset threshold in the electronic device when the antenna module is in operation, and the number of coils is determined according to the number of target positions. The first end and the second end of the coil, where the opening is formed, are connected to the control module; wherein when the SAR value when the antenna module is in operation is greater than the preset threshold, the control module controls the first end and the second end to be conductive. The first end or the second end of the coil, where the opening is formed, is grounded.

2. The electronic device of claim 1, wherein, When the SAR value when the antenna module is in operation is less than or equal to the preset threshold, the control module controls the first end and the second end to be disconnected, and the coil is formed as a parasitic antenna of the antenna module. The wavelength corresponding to the working frequency band of the antenna module is an integer multiple of the length of the coil.

3. The electronic device of claim 1, wherein, The coil is located in an antenna clearance area of the antenna module.

4. The electronic device of any of claims 1-3, wherein, The control module comprises a magnetic field induction unit, a switch unit, and a control unit.

5. The electronic device of any of claims 1-3, wherein, The magnetic field induction unit is used for detecting electromagnetic field intensity. The first end of the switch unit is connected to the first end of the coil, where the opening is formed, and the second end of the switch unit is connected to the second end of the coil, where the opening is formed. The control unit is connected to the magnetic field induction unit and the switch unit; when the electromagnetic field intensity is higher than a preset threshold, the control unit outputs a first control signal to the switch unit, the switch unit is in a conductive state under the first control signal, and the first end and the second end of the coil are conductive; wherein the preset threshold is the electromagnetic field intensity when the SAR value when the antenna module is in operation reaches the preset threshold. When the electromagnetic field intensity is less than or equal to the preset threshold, the control unit outputs a second control signal to the switch unit, the switch unit is in a disconnected state under the second control signal, the first end and the second end of the coil are disconnected, and the coil is formed as a parasitic antenna of the antenna module.

6. The electronic device of claim 5, wherein, The switch unit comprises a single-pole single-throw switch and a first resistor.

7. The electronic device of claim 5, wherein, The first end of the first resistor is connected to the first end of the coil, where the opening is formed, the second end of the first resistor is connected to the first end of the single-pole single-throw switch, and the second end of the single-pole single-throw switch is connected to the second end of the coil, where the opening is formed. The first resistor is a patch resistor arranged on a printed circuit board (PCB).

8. The electronic device of claim 7, wherein, The control unit comprises a modem, a first switch, a second switch, and a third resistor.

9. The electronic device of claim 5, wherein, The first end of the first switch is grounded, the second end of the first switch is connected to the control end of the second switch and the first end of the third resistor, the control end of the first switch is connected to the magnetic field induction unit, the first end of the second switch is connected to the control end of the switch unit, and the second end of the second switch is connected to the second end of the third resistor and the modem. The second end of the third resistor is connected to the second end of the switch unit. Wherein, in the case that the electromagnetic field intensity is higher than the preset threshold, the first switch is in an off state and the second switch is in an on state; the first control signal of the modem is transmitted to the switch unit through the second switch, the switch unit is in an on state, and the first end and the second end of the coil are in conduction.

10. The electronic device of claim 9, wherein, In the case that the electromagnetic field intensity is less than or equal to the preset threshold, the first switch is in an on state and the second switch is in an off state; the second control signal of the modem is transmitted to the switch unit through the third resistor, the switch unit is in an off state, the first end and the second end of the coil are disconnected, and the coil forms a parasitic antenna of the antenna module.

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