An electronic device

By setting the button assembly and the circuit board assembly on the frame of the electronic device to make electrical connections, the sensing electrode function of the SAR sensor is realized, which solves the problem of antenna performance degradation when the electronic device is close to the human body, and improves antenna performance and device reliability.

CN122246461APending Publication Date: 2026-06-19BEIJING XIAOMI MOBILE SOFTWARE CO LTD

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
BEIJING XIAOMI MOBILE SOFTWARE CO LTD
Filing Date
2024-12-18
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

In existing technologies, when electronic devices are close to the human body, they cannot effectively sense the antenna at the frame through the SAR sensor, which leads to the need to hard-cut the power and affect the antenna performance.

Method used

A button assembly is set on the frame of the electronic device and electrically connected to the motherboard through a circuit board assembly. The circuit board assembly serves as the sensing electrode of the SAR sensor, realizing the button function. It is also connected to the SAR sensor through a detection channel, allowing the antenna to back off its power based on the distance from the user.

Benefits of technology

It improves the antenna performance of electronic devices, avoids the impact of hard power reduction on antenna performance, simplifies the structure, reduces the internal space occupied, and is conducive to miniaturization design and reliability.

✦ Generated by Eureka AI based on patent content.

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Abstract

This disclosure relates to an electronic device comprising a mid-frame, a SAR sensor, and at least one button assembly. The mid-frame includes a first support portion and a frame surrounding the first support portion. At least one button assembly is disposed on the frame, and each button assembly is electrically connected to a motherboard via a circuit board assembly. The detection end of the SAR sensor is connected to the circuit board assembly via a detection channel. This allows the circuit board assembly to serve as the sensing electrode of the SAR sensor, enabling the antenna radiator on the electronic device to perform power back-off based on the detected distance to the user, rather than hard-reducing the power, thereby effectively improving the antenna performance of the electronic device.
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Description

Technical Field

[0001] This disclosure relates to the field of terminals, and more particularly to an electronic device. Background Technology

[0002] To reduce the impact of electromagnetic radiation from electronic devices on human health, the antenna transmission power of these devices must be reduced when a person is near them to avoid exceeding the Specific Absorption Rate (SAR). However, methods used in related technologies to avoid exceeding the SAR limit can affect the antenna performance of electronic devices. Summary of the Invention

[0003] To overcome the problems existing in the related technologies, this disclosure provides an electronic device.

[0004] This disclosure provides an electronic device, the electronic device including a mid-frame, the mid-frame including a first support portion and a border surrounding the first support portion; at least one button assembly disposed on the border, each of the button assemblies being electrically connected to a motherboard via a circuit board assembly; and a SAR sensor, the detection end of the SAR sensor being connected to the circuit board assembly via a detection channel.

[0005] In some embodiments of this disclosure, the circuit board assembly is provided with an electrical connection portion, and the circuit board assembly is electrically connected to the motherboard through the electrical connection portion. The electrical connection portion includes a plurality of connection terminals, and the detection channel is electrically connected to one of the plurality of connection terminals.

[0006] In some embodiments of this disclosure, the reference end of the SAR sensor is connected to the circuit board assembly via a reference channel.

[0007] In some embodiments of this disclosure, the electrical connection portion further includes a grounding terminal, and the reference channel is electrically connected to the grounding terminal.

[0008] In some embodiments of this disclosure, the first end of the detection channel is connected to the detection end of the SAR sensor, and the second end of the detection channel is electrically connected to the connection terminal in sequence through a first resistor and an inductor; the first end of the reference channel is connected to the reference end of the SAR sensor, and the second end of the reference channel is electrically connected to the ground terminal of the electrical connection part through a second resistor.

[0009] In some embodiments of this disclosure, the first resistor and the second resistor are arranged around the SAR sensor, and the inductor is arranged close to the electrical connection.

[0010] In some embodiments of this disclosure, the circuit board assembly includes a flexible circuit board, the flexible circuit board including a first portion and a second portion connected together, the first portion being used for electrical connection with the button assembly, and the electrical connection portion being disposed in the second portion.

[0011] In some embodiments of this disclosure, the circuit board assembly further includes a second support portion, the first portion is disposed on the second support portion and is disposed opposite to the frame, the button assembly includes a button body and a pressing member, the button body is disposed on the surface of the first portion facing the frame, and the pressing member is disposed on the frame corresponding to the position of the button body and protrudes out of the frame.

[0012] In some embodiments of this disclosure, a slot is provided on the frame corresponding to the position of the pressing member, and the pressing member is accommodated in the slot.

[0013] In some embodiments of this disclosure, an antenna radiator is provided on the frame, the antenna radiator is spaced apart from the first support portion, an insulating filler portion is provided between the antenna radiator and the first support portion, a groove is provided on the insulating filler portion, the second support portion and the first portion are embedded in the groove, and the second portion is located outside the groove.

[0014] In some embodiments of this disclosure, the second portion is disposed opposite to the first support portion, and the electrical connection portion is disposed on the surface of the second portion facing away from the first support portion.

[0015] In some embodiments of this disclosure, at least a portion of the frame constitutes an antenna radiator, and each of the button assemblies is spaced apart along the extension direction of the antenna radiator.

[0016] In some embodiments of this disclosure, the electronic device further includes: a detection unit configured to detect the pressing state of each of the button components; and a control unit configured to adjust the SAR value of the antenna radiator on the frame according to the detection result of the SAR sensor and the pressing state.

[0017] The technical solutions provided by the embodiments of this disclosure may include the following beneficial effects:

[0018] The electronic device disclosed herein has at least one button assembly on its frame. Each button assembly is electrically connected to the motherboard via a circuit board assembly, thereby enabling each button assembly to perform a button function. The detection end of the SAR sensor is connected to the circuit board assembly via a detection channel. This allows the circuit board assembly to serve as the sensing electrode of the SAR sensor, enabling the antenna radiator on the electronic device to perform power back-off based on the detected distance to the user, rather than hard-reducing the power, thus effectively improving the antenna performance of the electronic device.

[0019] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0020] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0021] Figure 1 This is a schematic diagram of the structure of an electronic device from a first perspective, according to an exemplary embodiment;

[0022] Figure 2 This is a schematic diagram of the structure of an electronic device from a second perspective, according to an exemplary embodiment.

[0023] Figure 3 This is an exploded schematic diagram of an electronic device according to an exemplary embodiment;

[0024] Figure 4 This is a schematic diagram illustrating the connection relationship between the electrical connection portion and the SAR sensor according to an exemplary embodiment;

[0025] Figure 5 This is a schematic diagram of the structure of a circuit board assembly according to an exemplary embodiment;

[0026] Figure 6 This is a schematic diagram of the structure of an electronic device according to an exemplary embodiment;

[0027] Figure 7 yes Figure 6 Sectional view along the middle AA direction;

[0028] Figure 8 yes Figure 7 A magnified view of a portion of point B in the middle.

[0029] In the picture:

[0030] 1-Middle frame; 11-First support part; 12-Border edge; 121-Slot; 122-Separation; 13-Insulation filling part; 131-Groove; 2-Button assembly; 21-Button body; 22-Pressing part; 3-Circuit board assembly; 31-Electrical connection part; 311-Connection terminal; 312-Grounding terminal; 313-Detection channel; 314-Reference channel; 315-First resistor; 316-Second resistor; 317-Inductor; 32-Flexible circuit board; 321-First part; 322-Second part; 33-Second support part; 34-Third support part; 4-SAR sensor; 5-Antenna radiator. Detailed Implementation

[0031] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0032] With the development of information technology, mobile phones and other electronic devices are widely used. These devices typically have antennas to enable communication. During communication, these antennas generate electromagnetic radiation. To reduce the impact of this radiation on human health, the antenna's transmission power needs to be reduced when a person approaches the device to prevent the Specific Absorption Rate (SAR) from exceeding the limit. Currently, there are generally two methods to reduce antenna SAR: one is to modify the antenna's SAR value through design to avoid excessively concentrated antenna directionality; the other is to introduce SAR sensors to detect the distance between the user and the electronic device, and reduce the SAR value of the antenna covered by the SAR sensor when a person is detected approaching.

[0033] However, the method of introducing SAR sensors to reduce SAR values ​​is limited by structural design. It's impossible for SAR sensors to detect antennas at various locations on electronic devices. Antennas that cannot be detected by SAR sensors then have their SAR values ​​reduced through hard power reduction, which negatively impacts the antenna performance of the electronic device. For example, since the sensing electrodes of SAR sensors must be non-grounded metal, it's inconvenient to place non-grounded metal near the side buttons of electronic devices. Consequently, the frame antennas near the buttons cannot be detected by SAR sensors, and the SAR value can only be reduced through hard power reduction, resulting in poor antenna performance.

[0034] To address the aforementioned technical problems, this disclosure provides an electronic device with at least one button assembly on its frame. Each button assembly is electrically connected to the main board via a circuit board assembly, enabling each button assembly to perform a button function. The detection end of a SAR sensor is connected to the circuit board assembly via a detection channel. This allows the circuit board assembly to serve as the sensing electrode of the SAR sensor, enabling the antenna radiator on the electronic device to perform power back-off based on the detected distance to the user, rather than hard-reducing the power, thereby effectively improving the antenna performance of the electronic device.

[0035] An exemplary embodiment of this disclosure provides an electronic device, which may be a mobile device such as a mobile phone, tablet computer, laptop computer, handheld computer, in-vehicle electronic device, wearable device, ultra-mobile personal computer (UMPC), netbook, or personal digital assistant (PDA), or a non-mobile device such as a personal computer (PC), television (TV), ATM, or self-service machine.

[0036] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the electronic device includes a mid-frame 1, a SAR sensor 4, and at least one button assembly 2. The mid-frame 1 includes a first support portion 11 and a frame 12 surrounding the first support portion 11. At least one button assembly 2 is disposed on the frame 12. Exemplarily, only one button assembly 2 can be disposed on the frame 12, or multiple button assemblies 2 can be disposed as needed. The button assembly 2 can be, for example, a power button, a volume button, etc. Each button assembly 2 is electrically connected to the motherboard through a circuit board assembly 3, thereby enabling each button assembly 2 to perform button functions. The detection end of the SAR sensor 4 is connected to the circuit board assembly 3 through a detection channel 313. This design allows the circuit board assembly 3 to serve as the sensing electrode of the SAR sensor 4, thereby enabling the antenna radiator 5 on the electronic device to perform power back-off based on the detected distance to the user instead of hard-reducing the power, thus effectively improving the antenna performance of the electronic device.

[0037] Furthermore, by using the circuit board assembly 3 as the sensing electrode of the SAR sensor 4, the antenna radiator 5 on the electronic device is not limited by its design type; that is, the antenna radiator 5 can be grounded or ungrounded, which helps to improve the antenna performance of the antenna radiator 5. At the same time, since there is no need to set up an additional ungrounded metal as the sensing electrode of the SAR sensor 4, it will not affect the structural strength of the electronic device, thereby helping to improve the reliability of the electronic device.

[0038] Combination Figure 3 and Figure 4 In one embodiment, the circuit board assembly 3 is provided with an electrical connection portion 31, through which the circuit board assembly 3 is electrically connected to the motherboard. The electrical connection portion 31 can be, for example, a BTB (Board To Board) connector. The electrical connection portion 31 includes multiple connection terminals 311, and the detection channel 313 is electrically connected to one of the multiple connection terminals 311, thereby realizing the electrical connection between the SAR sensor 4 and the circuit board assembly 3, so that the circuit board assembly 3 can serve as the sensing electrode of the SAR sensor 4. This arrangement simplifies the structure of the electronic device and facilitates manufacturing. Furthermore, no additional electrical components are required when realizing the electrical connection between the SAR sensor 4 and the circuit board assembly 3, thereby reducing the space occupied inside the electronic device and promoting miniaturization.

[0039] Combination Figure 4 In one embodiment, the reference end of the SAR sensor 4 is connected to the circuit board assembly 3 via a reference channel 314. By setting the reference channel 314, the detection channel 313 can be adjusted, thereby improving the antenna performance of the electronic device. Furthermore, since the circuit board assembly 3 is susceptible to the temperature of its environment when it is used as the sensing electrode of the SAR sensor 4, the reference channel 314 can be, for example, a temperature compensation channel to improve the detection accuracy of the circuit board assembly 3 when it is used as the sensing electrode of the SAR sensor 4.

[0040] Combination Figure 4 In one embodiment, the electrical connection portion 31 further includes a ground terminal 312, and the reference channel 314 is electrically connected to the ground terminal 312, thereby realizing the connection between the circuit board assembly 3 and the reference end of the SAR sensor 4. This design simplifies the arrangement of the reference channel 314 and helps to simplify the structure of the electronic device.

[0041] Combination Figure 4In one embodiment, the reference channel 314 and the detection channel 313 are connected by parallel differential traces. This arrangement improves the similarity of the environmental conditions experienced by the reference channel 314 and the detection channel 313 during transmission. These environmental conditions can include, for example, temperature, humidity, and electromagnetic interference. This helps reduce phase errors caused by path differences, improves the phase stability of the capacitance signal, and thus effectively improves the accuracy of the detected capacitance signal. It should be noted that parallel differential traces refer to the reference channel 314 and the detection channel 313 being two parallel traces of equal length.

[0042] In one embodiment, both the reference channel 314 and the detection channel 313 employ a three-dimensional ground plane. This design effectively controls the signal propagation path and reduces the impact of external electromagnetic interference, thereby significantly improving the detection performance of the SAR sensor 4. It should be noted that a three-dimensional ground plane is a technique in printed circuit board design, referring to using the ground plane around the signal lines to form a three-dimensional grounding structure to reduce coupling and interference between signal lines.

[0043] Combination Figure 4 In one embodiment, the first end of the detection channel 313 is connected to the detection end of the SAR sensor 4, and the second end of the detection channel 313 is electrically connected to the connection terminal 311 via a first resistor 315 and an inductor 317. By setting the first resistor 315, thermal noise generated by the environment around the detection channel 313 can be suppressed, thereby improving the detection accuracy of the SAR sensor 4. The inductor 317 can act as a filter to filter out interference from other signals, thereby further improving the detection accuracy of the SAR sensor 4.

[0044] The first end of the reference channel 314 is connected to the reference end of the SAR sensor 4, and the second end of the reference channel 314 is electrically connected to the ground terminal 312 of the electrical connection part 31 through the second resistor 316. By setting the second resistor 316, thermal noise generated by the environment around the reference channel 314 can be suppressed, further improving the detection accuracy of the SAR sensor 4.

[0045] Combination Figure 4 In one embodiment, the first resistor 315 and the second resistor 316 are arranged around the SAR sensor 4, and the inductor 317 is arranged near the electrical connection portion 31. This arrangement is beneficial for improving the suppression of thermal noise and the filtering effect.

[0046] Combination Figure 3 and Figure 5In one embodiment, the circuit board assembly 3 includes a flexible circuit board 32, which includes a first portion 321 and a second portion 322 connected together. The first portion 321 is used for electrical connection with the button assembly 2, and the electrical connection portion 31 is disposed on the second portion 322. Because the flexible circuit board 32 is bendable, this design improves the flexibility of arranging the circuit board assembly 3, thereby reducing the space occupied by the circuit board assembly 3 within the electronic device, making the structure of the electronic device more compact, and thus facilitating the miniaturization design of the electronic device.

[0047] Combination Figure 5 In one embodiment, the circuit board assembly 3 further includes a second support portion 33, and a first portion 321 is disposed on the second support portion 33. The second support portion 33 may be a non-metallic material such as resin or plastic. Exemplarily, the first portion 321 can be bonded to the second support portion 33, allowing the first portion 321 to be embedded in the second support portion 33. By providing the second support portion 33, the first portion 321 can be supported, improving its structural strength and facilitating its connection with the button assembly 2. The first portion 321 is disposed opposite to the frame 12, thus fully utilizing the space perpendicular to the first support portion 11. This effectively reduces the space occupied by the circuit board assembly 3 within the electronic device's internal space, resulting in a more compact structure and facilitating miniaturization. Furthermore, it allows for the placement of more electrical components, enriching the functionality of the electronic device.

[0048] Combination Figure 6 , Figure 7 and Figure 8 The button assembly 2 includes a button body 21 and a pressing member 22. The button body 21 is disposed on the surface of the first portion 321 facing the frame 12. Exemplarily, the first portion 321 includes a first surface and a second surface facing away from each other. The first surface faces the frame 12, the button body 21 is disposed on the first surface, and the second support portion 33 is connected to the second surface of the first portion 321. The pressing member 22 is disposed on the frame 12 corresponding to the position of the button body 21 and protrudes from the outside of the frame 12. This arrangement facilitates the electrical connection between the button body 21 and the first portion 321, and also facilitates the operation of the button assembly 2 by the user, thereby improving the ease of use of the button assembly 2.

[0049] Combination Figure 8 In one embodiment, a slot 121 is provided on the frame 12 corresponding to the position of the pressing member 22, and the pressing member 22 is accommodated in the slot 121. This design not only makes the electronic device more compact, but also improves the smoothness of the pressing member 22 when it is pressed by providing the slot 121, thereby improving the operational sensitivity of the button assembly 2 and enhancing the user experience.

[0050] Combination Figure 6 and Figure 8 In one embodiment, an antenna radiator 5 is disposed on the frame 12, with a gap between the antenna radiator 5 and the first support portion 11. An insulating filler portion 13, which may be made of plastic, is disposed between the antenna radiator 5 and the first support portion 11. This effectively avoids interference from the first support portion 11 to the antenna radiator 5, thereby improving the antenna performance of the antenna radiator 5. A groove 131 is provided on the insulating filler portion 13, with the second support portion 33 and the first portion 321 embedded in the groove 131, and the second portion 322 located outside the groove 131. With this arrangement, the groove 131 provides accommodating space for the second support portion 33 and the first portion 321, thereby facilitating their installation and fixation. On the other hand, the insulating filling part 13 can also be used to create an insulating gap between the first part 321 and the second support part 33 and the antenna radiator 5, which can prevent the second support part 33 and the first part 321 from interfering with the antenna radiator 5. This ensures that the antenna radiator 5 can achieve the function of transmitting and receiving, while further improving the antenna performance of the antenna radiator 5.

[0051] Combination Figure 5 and Figure 6 In one embodiment, the second portion 322 is disposed opposite to the first support portion 11. This allows the second portion 322 to fit snugly against the first support portion 11, effectively reducing the space occupied by the second portion 322 within the electronic device and making the device's structure more stable. An electrical connection portion 31 is disposed on the surface of the second portion 322 facing away from the first support portion 11. This design facilitates the connection of the electrical connection portion 31 to the motherboard.

[0052] In one embodiment, the circuit board assembly 3 further includes a third support portion 34, which is disposed on the surface of the second portion 322 facing the first support portion 11, corresponding to the position of the electrical connection portion 31. The third support portion 34 may be a non-metallic material such as resin or plastic. The third support portion 34 enhances the structural strength of the second portion 322 at the position of the electrical connection portion 31, thereby facilitating electrical connection with the motherboard.

[0053] Combination Figure 5 In one embodiment, at least a portion of the frame 12 constitutes the antenna radiator 5. For example, the middle frame 1 includes a plurality of frame 12 surrounding the first support portion 11, such that at least a portion of the frame 12 on one frame 12 (e.g., the frame 12 on the side where the button assembly 2 is provided) constitutes the antenna radiator 5. For example, a portion of the structure of the side frame 12 may constitute the antenna radiator 5, or the entire structure of the side frame 12 may constitute the antenna radiator 5.

[0054] Combination Figure 2 Each button assembly 2 is spaced apart along the extension direction of the antenna radiator 5. For example, when the side frame 12 forms multiple antenna radiators 5 through the slit 122, each button assembly 2 can be positioned on a different antenna radiator 5 along the extension direction of the side frame 12. This arrangement makes the electronic device more compact while avoiding interference between the button assemblies 2, thereby improving the reliability and aesthetics of the electronic device.

[0055] In one embodiment, the electronic device further includes a detection unit and a control unit. The detection unit is configured to detect the pressed state of each button assembly 2, and the control unit is configured to adjust the SAR value of each antenna radiator 5 on the frame 12 based on the detection result of the SAR sensor 4 and the pressed state. This design improves the accuracy and convenience of adjusting the SAR value of each antenna radiator 5.

[0056] For example, the usage status of an electronic device can be detected by a status detection sensor, including ear-to-ear calling and non-ear-to-ear calling.

[0057] Scenario 1: When the status monitoring sensor detects that the electronic device is in a pin-to-ear call state, it further detects the usage status of the hotspot on the electronic device. When the status monitoring sensor detects that the electronic device is in a pin-to-ear call state and the hotspot is turned off, the first SAR reduction scenario is invoked. The first SAR reduction scenario refers to power back-off of the antenna radiator 5 on the top bezel 12 of the electronic device (i.e., the antenna radiator 5 on the electronic device close to the user's head) to reduce the SAR value of the antenna radiator 5 on the top bezel 12 of the electronic device.

[0058] Scenario 2: When the SAR sensor 4 is in the triggered state, and the status monitoring sensor detects that the electronic device is in a non-in-ear call state and the hotspot is off, and at the same time, the detection unit detects that each button component 2 is in a non-pressed state, the second SAR value reduction scenario is invoked. The second SAR value reduction scenario refers to backing up the power of each antenna radiator 5 sensed by the SAR sensor 4 to reduce the SAR value of each antenna radiator 5 sensed by the SAR sensor 4.

[0059] Scenario 3: The priority of the pressed state is higher than the state triggered by SAR sensor 4. That is, when the detection unit detects that each button component 2 is in a pressed state, it is not necessary to judge the trigger state of SAR sensor 4; it can be determined that the user is operating the electronic device at this time. Then, the status monitoring sensor is used to detect whether the electronic device is in an ear-to-ear call state. When it is detected that the electronic device is not in an ear-to-ear call state and the hotspot is off (for example, the button is accidentally pressed by a foreign object such as a cluttered object), the second SAR value reduction scenario is invoked; when it is detected that the electronic device is in an ear-to-ear call state and the hotspot is off (for example, the user adjusts the volume while in an ear-to-ear call), the first SAR value reduction scenario is invoked.

[0060] Scenario 4: When SAR sensor 4 is in an untriggered state, the status monitoring sensor detects that the electronic device is not in a hands-free calling state and the hotspot is off, and at the same time, the detection unit detects that each button component 2 is not pressed. In this case, the third SAR reduction scenario is invoked. The third SAR reduction scenario refers to the situation where there is no need to back up the power of each antenna radiator 5, that is, there is no need to adjust the SAR value of each antenna radiator 5.

[0061] Scenario 5: If the hotspot is active, no other conditions need to be checked. By default, the hotspot is in the highest priority scenario. In this case, the fourth SAR reduction scenario is invoked. The fourth SAR reduction scenario refers to backing down the maximum power of each antenna radiator 5.

[0062] In this embodiment, the judgment scenario for adjusting the SAR value of each antenna radiator 5 can be set according to actual needs, and no specific limitation is made here.

[0063] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the following claims.

[0064] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. An electronic device, characterized in that, The electronic device includes: The middle frame includes a first support portion and a border surrounding the first support portion; At least one button component is disposed on the frame, and each button component is electrically connected to the motherboard through a circuit board assembly; A SAR sensor, wherein the detection end of the SAR sensor is connected to the circuit board assembly via a detection channel.

2. The electronic device according to claim 1, characterized in that, The circuit board assembly is provided with an electrical connection part, and the circuit board assembly is electrically connected to the motherboard through the electrical connection part. The electrical connection part includes multiple connection terminals, and the detection channel is electrically connected to one of the multiple connection terminals.

3. The electronic device according to claim 2, characterized in that, The reference end of the SAR sensor is connected to the circuit board assembly via a reference channel.

4. The electronic device according to claim 3, characterized in that, The electrical connection portion further includes a grounding terminal, and the reference channel is electrically connected to the grounding terminal.

5. The electronic device according to claim 3, characterized in that, The first end of the detection channel is connected to the detection end of the SAR sensor, and the second end of the detection channel is electrically connected to the connection terminal in sequence through a first resistor and an inductor. The first end of the reference channel is connected to the reference end of the SAR sensor, and the second end of the reference channel is electrically connected to the ground terminal of the electrical connection part through a second resistor.

6. The electronic device according to claim 5, characterized in that, The first resistor and the second resistor are arranged around the SAR sensor, and the inductor is arranged near the electrical connection.

7. The electronic device according to claim 2, characterized in that, The circuit board assembly includes a flexible circuit board, which includes a first part and a second part connected together. The first part is used for electrical connection with the button assembly, and the electrical connection part is disposed in the second part.

8. The electronic device according to claim 7, characterized in that, The circuit board assembly further includes a second support portion, the first portion is disposed on the second support portion and is disposed opposite to the frame, the button assembly includes a button body and a pressing member, the button body is disposed on the surface of the first portion facing the frame, and the pressing member is disposed on the frame corresponding to the position of the button body and protrudes out of the frame.

9. The electronic device according to claim 8, characterized in that, The frame has a slot corresponding to the position of the pressing member, and the pressing member is accommodated in the slot.

10. The electronic device according to claim 8, characterized in that, An antenna radiator is provided on the frame, and the antenna radiator is spaced apart from the first support portion. An insulating filling portion is provided between the antenna radiator and the first support portion, and a groove is provided on the insulating filling portion. The second support portion and the first portion are embedded in the groove, and the second portion is located outside the groove.

11. The electronic device according to claim 7, characterized in that, The second part is disposed opposite to the first support part, and the electrical connection part is disposed on the surface of the second part facing away from the first support part.

12. The electronic device according to any one of claims 1 to 11, characterized in that, At least a portion of the frame constitutes an antenna radiator, and each of the button assemblies is spaced apart along the extension direction of the antenna radiator.

13. The electronic device according to any one of claims 1 to 11, characterized in that, The electronic device also includes: The detection unit is configured to detect the pressing state of each of the button components. The control unit is configured to adjust the SAR value of the antenna radiator on the frame based on the detection result of the SAR sensor and the pressing state.