CN117110728A - SAR detection device, antenna assembly and electronic equipment - Google Patents

SAR detection device, antenna assembly and electronic equipment Download PDF

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Publication number
CN117110728A
CN117110728A CN202210541794.7A CN202210541794A CN117110728A CN 117110728 A CN117110728 A CN 117110728A CN 202210541794 A CN202210541794 A CN 202210541794A CN 117110728 A CN117110728 A CN 117110728A
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CN
China
Prior art keywords
antenna
sar
metal sheet
detection device
radiator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210541794.7A
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Chinese (zh)
Inventor
陈栋
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guangdong Oppo Mobile Telecommunications Corp Ltd
Original Assignee
Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Guangdong Oppo Mobile Telecommunications Corp Ltd filed Critical Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority to CN202210541794.7A priority Critical patent/CN117110728A/en
Publication of CN117110728A publication Critical patent/CN117110728A/en
Pending legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
    • G01R29/08—Measuring electromagnetic field characteristics
    • G01R29/10—Radiation diagrams of antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support

Abstract

The application discloses a SAR detection device, an antenna assembly and electronic equipment, which adopt a suspension metal sheet as a SAR Sensor Pad and are non-integral with an antenna, so that on one hand, the circuit design of the antenna is simplified, and SAR is detected to achieve reasonable control of antenna power; on the other hand, the problem of poor isolation between the antenna and the adjacent antenna is avoided, the performance of the antenna is guaranteed without affecting the normal performance of the antenna, the radiation efficiency of the medium-high frequency band of the antenna close to the suspension metal sheet is improved, and meanwhile, the problem of static electricity possibly caused when the SAR Sensor Pad and the antenna are integrated is also avoided.

Description

SAR detection device, antenna assembly and electronic equipment
Technical Field
The present application relates to, but is not limited to, wireless communication technology, and in particular, to a SAR detection device, an antenna assembly, and an electronic device.
Background
Wireless communication devices, such as cell phones, are continually pursuing better antenna radiation performance in order to optimize the user's surfing experience, but as the antenna radiation performance is better, the greater the radiation generated by the cell phone to the human body, the higher the electromagnetic wave absorption ratio or specific absorption rate (SAR, specific Absorption Rate) value.
In the design of wireless communication equipment, an electromagnetic wave absorption ratio Sensor (SAR Sensor) can be used to determine the proximity of a human body to electronic equipment, so as to realize the detection of SAR. When the human body is detected to be close to the electronic equipment, the transmitting power of the antenna is reduced so as to reduce the SAR value, and when the human body is far away from the electronic equipment, the radiation performance of the antenna is not affected.
How to better utilize the SAR sensor to detect SAR to achieve reasonable control of the transmit power of the antenna without affecting the performance of the antenna is a problem to be solved.
Disclosure of Invention
The application provides a SAR detection device, an antenna assembly and electronic equipment, which can detect SAR to achieve reasonable control of the transmitting power of an antenna without affecting the performance of the antenna.
An embodiment of the present application provides a SAR detection apparatus for an electronic device, including: a SAR sensor electrode, a SAR sensor and an inductance L, wherein,
the SAR sensor electrode is electrically connected with the SAR sensor through the inductor L;
the SAR sensor electrode is a suspension metal sheet arranged close to the antenna and is used for outputting induction capacitance;
the SAR sensor is used for acquiring the induction electric capacity to determine whether to reduce the power of the antenna.
According to the SAR detection device provided by the embodiment of the application, the suspension metal sheet is adopted as the SAR Sensor Pad and is not in common with the antenna, so that on one hand, the circuit design of the antenna is simplified, and the SAR is detected to achieve reasonable control of the antenna power; on the other hand, the problem of poor isolation between the antenna and the adjacent antenna is avoided, the performance of the antenna is guaranteed without affecting the normal performance of the antenna, and meanwhile, the problem of static electricity possibly caused when the SAR Sensor Pad and the antenna are integrated is also avoided.
An embodiment of the present application provides an antenna assembly including: the SAR detection device according to any one of the above, and a radiator; wherein,
the radiator is arranged on a metal middle frame of the electronic equipment where the antenna component is arranged;
the SAR sensor electrode in the SAR detection device is a suspension metal sheet, the suspension metal sheet is arranged between the radiator and the PCB of the electronic equipment, and the suspension metal sheet is parallel to the radiator.
The antenna assembly provided by the embodiment of the application firstly adopts the suspension metal sheet as the SAR Sensor Pad which is not in common with the antenna, so that on one hand, the circuit design of the antenna is simplified, and the SAR is detected to achieve reasonable control of the antenna power; on the other hand, the problem of poor isolation between the antenna and the adjacent antenna is avoided, the performance of the antenna is guaranteed without affecting the normal performance of the antenna, and meanwhile, the problem of static electricity possibly caused when the SAR Sensor Pad and the antenna are integrated is also avoided. Secondly, because the suspension metal sheet 11 is arranged between the PCB and the antenna, and the suspension metal sheet 11 is parallel to the radiation surface of the antenna, the induction of the SAR detection device to the human body can be ensured to cover all surfaces near the antenna which are close to the SAR detection device as much as possible, the requirement of regulations can be met, and the sensitivity is higher. Furthermore, through the arrangement of the suspension metal sheet, the radiation efficiency of the medium-high frequency band of the antenna close to the suspension metal sheet is improved.
An embodiment of the present application provides an electronic device, including: an antenna assembly as claimed in any preceding claim. The electronic equipment provided by the embodiment of the application realizes SAR detection so as to achieve reasonable control of the transmitting power of the antenna, and meanwhile, the performance of the antenna is not affected.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application. The objectives and other advantages of the application will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate and do not limit the application.
FIG. 1 is a schematic diagram of the composition structure of an SAR detection device in an embodiment of the present application;
FIG. 2 is a schematic diagram of an antenna assembly according to an embodiment of the present application;
FIG. 3 is a schematic circuit diagram illustrating the operation of an antenna assembly according to an embodiment of the present application;
FIG. 4 is a graph illustrating a simulation of the efficiency of an antenna assembly according to an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, embodiments of the present application will be described in detail hereinafter with reference to the accompanying drawings. It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be arbitrarily combined with each other.
In order that the application may be readily understood, a more complete description of the application will be rendered by reference to the appended drawings. Embodiments of the application are illustrated in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It is to be understood that the terms "first," "second," and the like, as used herein, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or number of technical features being indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
It is to be understood that in the following embodiments, "connected" is understood to mean "electrically connected", "communicatively connected", etc., if the connected circuits, modules, units, etc., have electrical or data transfer between them.
As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," and/or the like, specify the presence of stated features, integers, steps, operations, elements, components, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof. Also, the term "and/or" as used in this specification includes any and all combinations of the associated listed items.
In order to detect the SAR by using the SAR Sensor, the SAR Sensor is connected to an electromagnetic wave absorption ratio Sensor electrode (SAR Sensor Pad), when the SAR Sensor electrode senses that a human body approaches, an inductive capacitor is formed between the human body and the SAR Sensor electrode, and the SAR Sensor connected with the SAR Sensor electrode detects the electric quantity of the inductive capacitor to judge that the human body approaches, so that the use safety standard of the electronic equipment is met by reducing the antenna emission power.
In the related art, the SAR Sensor Pad is integrated with the antenna, and the antenna radiator is used as the SAR Sensor Pad to sense the proximity of the human body, but this approach may cause the circuit design of the antenna to be complicated, and on the other hand, since the SAR Sensor electrode must be a non-grounded metal, that is, the antenna radiator as the SAR Sensor Pad is not grounded, the isolation between the antenna radiator and the adjacent antenna may be deteriorated, thereby affecting the performance of the antenna, and there may be an electrostatic problem.
In order to achieve detection of SAR to achieve reasonable control of the transmitting power of the antenna and not to affect the normal performance of the antenna, as shown in fig. 1, an embodiment of the present application provides a SAR detection apparatus, which is used in an electronic device, and includes: SAR sensor electrode 11, SAR sensor 12, and inductance L, wherein,
the SAR sensor electrode 11 is electrically connected with the SAR sensor 12 through an inductor L;
the SAR sensor electrode 11 is a suspension metal sheet arranged close to the antenna and is used for outputting induction capacitance; in one embodiment, this inductive capacity is indicative of the proximity of the human body to the antenna.
The SAR sensor 12 is configured to determine whether to reduce the power of the antenna based on the sensed capacitance.
The SAR detection device provided by the embodiment of the application adopts the suspension metal sheet as the SAR Sensor Pad, and is not integrated with the antenna, so that on one hand, the circuit design of the antenna is simplified, and the SAR is detected to achieve reasonable control of the antenna power; on the other hand, the problem of poor isolation between the antenna and the adjacent antenna is avoided, the performance of the antenna is guaranteed without affecting the normal performance of the antenna, and meanwhile, the problem of static electricity possibly caused when the SAR Sensor Pad and the antenna are integrated is also avoided.
In one embodiment, the inductance L is used to block interference between the SAR sensor 12 and the antenna in close proximity to the SAR sensor electrode 11.
In one embodiment, the SAR sensor 12 receives the sensed capacitance and converts the sensed capacitance to a digital signal to cause the electronic device to determine whether to reduce the power of the antenna based on the digital signal.
In an illustrative example, the SAR sensor 12 is arranged on the PCB 13 of the electronic device in which the SAR detection device is located, the suspension metal sheet 11 being arranged in suspension between the antenna and the PCB in which it is close, suspension meaning that the suspension metal sheet 11 is not co-integral with the antenna in which it is close, i.e. the suspension metal sheet 11 is in contact with neither the antenna nor the PCB. In one embodiment, the suspension metal sheet 11 is parallel to the radiating plane of the antenna to which it is close. It should be noted that the parallelism here may not be absolute parallelism, allowing for reasonable errors. In this embodiment, since the suspension metal sheet 11 is disposed between the PCB board and the antenna, and the suspension metal sheet 11 is parallel to the radiation surface of the antenna, it is ensured that the sensing capability of the SAR detection device to the human body covers all surfaces near the antenna near which the SAR detection device approaches as much as possible, so that the requirement of the regulations can be satisfied, and the sensitivity is higher.
In an illustrative example, the suspension metal plate 11 may be rectangular, elliptical, irregular, etc., and the suspension metal plate 11 may be sized so long as the induction of the suspension metal plate 11 covers as much as possible all surfaces near the antenna to which it is close. In one embodiment, the floating metal sheet 11 is rectangular in shape with an area greater than 100 square millimeters (mm) 2 )。
In an exemplary example, the SAR detection apparatus may further include: the spring (not shown) may be a conductive structure, such as a metal spring. The suspension metal plate 11 may be connected to the inductor L through the elastic piece. In one embodiment, the inductance L may be a large inductance, and theoretically, the larger the value of the inductance L, the better, for example, the inductance L may be 100nH to 150nH.
In an illustrative example, the SAR Sensor 12 may be a SAR Sensor chip (SAR Sensor IC) that is disposed on a PCB board 13 of an electronic device in which the SAR detection apparatus is located.
According to the SAR detection device provided by the embodiment of the application, the SAR sensor 12 is electrically connected with the suspension metal sheet 11, and the suspension metal sheet 11 can sense the distance change between a human body and electronic equipment where the SAR detection device is positioned by utilizing the principle of a flat capacitor, so that the approach degree of the human body to an antenna is known. In one embodiment, the floating metal sheet 11 and the human body respectively form two electrode plates of the plate capacitor, when the human body approaches to or departs from the antenna (i.e. the distance d between the two electrode plates changes), different induced capacitance is generated, and the smaller the distance d, the larger the induced capacitance value. Whereas the SAR sensor 12, which is electrically connected to the suspension metal plate 11, can monitor an analog signal characterizing the inductive capacity and convert the received analog signal into a digital signal. In this way, the electronic device where the SAR detection device is located can judge the proximity degree of the human body and the electronic device by comparing the digital signal with a preset capacitance threshold value, and determine whether to trigger to reduce the antenna power. In an embodiment, the SAR detection device provided by the embodiment of the present application may further include: the processor is used for judging that the digital signal exceeds a capacitance threshold value, indicating that the distance between the human body and the electronic equipment is smaller than a safe distance, and controlling to reduce the antenna power so as to realize the protection of the human body; and judging that the digital signal does not exceed the capacitance threshold value, indicating that the distance between the human body and the electronic equipment is larger than the safety distance, maintaining normal antenna power and ensuring good communication experience.
The embodiment of the present application further provides an antenna assembly, as shown in fig. 2, where the antenna assembly may include a SAR detection device according to any one of the above, and a radiator 15; wherein,
a radiator 15 arranged on a metal middle frame of the electronic device where the antenna assembly is located;
the SAR sensor electrode 11 in the SAR detection device is a suspension metal sheet disposed near the radiator 15, the suspension metal sheet 11 is disposed between the radiator 15 and the PCB board of the electronic device where the antenna assembly is located, and the suspension metal sheet 11 is parallel to the radiator 15.
In an illustrative example, as shown in fig. 2, the radiator 15 is provided with a first slit 111 at one end and a second slit 112 at the other end. In one embodiment, a feeding point 113 is provided near one end of the second slot 112 and a ground point 114 is provided near one end of the first slot 111. As shown in fig. 3, the feed source may be electrically connected to the radiator 15 through a spring sheet, such as a metal spring sheet, and feed the radiator 15 through a feed point 113. In fig. 3, the grounding point 114 of the radiator 15 is directly grounded, and a blocking capacitor is not required. However, the SAR Sensor Pad of the related art needs a blocking capacitor when it is co-located with the antenna to prevent the SAR Sensor Pad of the related art from directly electrically sensing ground, but may cause electrostatic problems. That is, the implementation mode of the non-co-body of the SAR Sensor Pad and the antenna in the embodiment of the application not only simplifies the circuit of the antenna, but also avoids the electrostatic problem possibly caused when the SAR Sensor Pad and the antenna are co-body.
In one embodiment, to achieve a band broadening effect, the antenna assembly of the present application may further include a tuning circuit, where the feed is electrically connected to the radiator 15 through the tuning circuit. It should be noted that, the positions and/or the number of the feeding points and the grounding points may be adjusted according to the needs, and the embodiment of the present application is only an example and is not intended to limit the protection scope of the present application.
It should be noted that fig. 2 illustrates an example in which the radiator 15 is disposed on the top metal center of the electronic device where the antenna assembly is located, but the position of the radiator 15 on the metal center is not limited, that is, the radiator 15 may be a radiator disposed at other positions of the metal center.
In one embodiment, taking the example that the radiator 15 is disposed on the metal middle frame at the top of the electronic device where the antenna assembly is located, a radiator 14 on the metal middle frame spaced from the first slot 111 may be a Wi-Fi antenna. In one embodiment, the other radiator 16 on the metal bezel spaced from the second slot 112 is another antenna.
In one embodiment, the inductance L in the SAR detection device may be a large inductance, and theoretically, the larger the value of the inductance L, the better, for example, the inductance L may be 100nH to 150nH. The inductor L blocks the influence of the middle and high frequency of the antenna on the measurement of the SAR sensor, and also blocks the influence of the SAR sensor on the performance of the antenna. Fig. 4 is a comparison of radiation efficiency simulation results of the antenna assembly according to the present application, as shown in fig. 4, curve 1 is a radiation efficiency curve of medium and high frequencies of the radiator 15 after the suspension metal sheet 11 is disposed, curve 2 is a radiation efficiency curve of medium and high frequencies of the radiator 15 after the suspension metal sheet 11 is not disposed, and as can be seen from the simulation results of fig. 4, the radiation efficiency of medium and high frequencies of the radiator 15 after the suspension metal sheet 11 is disposed is improved to a certain extent, the average radiation efficiency of the medium frequency band is improved by about 0.13dB, and the average radiation efficiency of the high frequency band is improved by about 0.17dB.
The antenna assembly provided by the embodiment of the application firstly adopts the suspension metal sheet as the SAR Sensor Pad which is not in common with the antenna, so that on one hand, the circuit design of the antenna is simplified, and the SAR is detected to achieve reasonable control of the antenna power; on the other hand, the problem of poor isolation between the antenna and the adjacent antenna is avoided, the performance of the antenna is guaranteed without affecting the normal performance of the antenna, and meanwhile, the problem of static electricity possibly caused when the SAR Sensor Pad and the antenna are integrated is also avoided. Secondly, because the suspension metal sheet 11 is arranged between the PCB and the antenna, and the suspension metal sheet 11 is parallel to the radiation surface of the antenna, the induction of the SAR detection device to the human body can be ensured to cover all surfaces near the antenna which are close to the SAR detection device as much as possible, the requirement of regulations can be met, and the sensitivity is higher. Furthermore, by the arrangement of the suspension metal sheet, the radiation efficiency of the middle-high frequency (MHB) band of the antenna close to the suspension metal sheet is improved.
The embodiment of the application also provides electronic equipment, which comprises the antenna assembly. The electronic device provided by the application can be any device with a communication function, such as a tablet personal computer, a mobile phone, an electronic reader, a remote controller, a personal computer, a notebook computer, a vehicle-mounted device, a network television, a wearable device and the like. The electronic device is capable of performing electromagnetic wave communication functions, i.e. the electronic device is capable of receiving and/or transmitting electromagnetic wave signals.
Although the embodiments of the present application are described above, the embodiments are only used for facilitating understanding of the present application, and are not intended to limit the present application. Any person skilled in the art can make any modification and variation in form and detail without departing from the spirit and scope of the present disclosure, but the scope of the present disclosure is to be determined by the appended claims.

Claims (13)

1. A specific absorption rate SAR detection apparatus for an electronic device, comprising: a SAR sensor electrode, a SAR sensor and an inductance L, wherein,
the SAR sensor electrode is electrically connected with the SAR sensor through the inductor L;
the SAR sensor electrode is a suspension metal sheet arranged close to the antenna and is used for outputting induction capacitance;
the SAR sensor is used for acquiring the induction electric capacity to determine whether to reduce the power of the antenna.
2. The SAR detection apparatus of claim 1, wherein the SAR sensor is disposed on a PCB board of the electronic device, and the suspension metal sheet is suspended between the antenna and the PCB board.
3. The SAR detection device of claim 2, wherein the suspension metal sheet is parallel to a radiating plane of the antenna.
4. A SAR detection device as claimed in claim 1, 2 or 3, wherein the suspended metal sheet has an area greater than 100 square millimeters.
5. The SAR detection device of claim 4, wherein the floating metal sheet is rectangular.
6. The SAR detection device of claim 1, wherein the suspension metal plate is connected to the inductor L via a spring plate.
7. The SAR detection device of claim 1, wherein the SAR sensor is a SAR sensor chip.
8. The SAR detection apparatus of claim 1 or 6, the SAR sensor 12 further converts the inductive capacitance to a digital signal;
the SAR detection device further comprises: a processor controlling to reduce the power of the antenna when the digital signal exceeds a capacitance threshold; when the digital signal does not exceed a capacitance threshold, power to the antenna is maintained.
9. The SAR detection apparatus of claim 1, wherein the antenna is a bezel antenna of the electronic device.
10. An antenna assembly, comprising: the SAR detection device of any one of claims 1-9, and a radiator; wherein,
the radiator is arranged on a metal middle frame of the electronic equipment where the antenna component is arranged;
the SAR sensor electrode in the SAR detection device is a suspension metal sheet, the suspension metal sheet is arranged between the radiator and the PCB of the electronic equipment, and the suspension metal sheet is parallel to the radiator.
11. The antenna assembly of claim 10, wherein the radiator is provided with a first slot at one end and a second slot at the other end.
12. The antenna assembly of claim 11, wherein a feed point is provided on the radiator at an end proximate the second slot and a ground point is provided at an end proximate the first slot.
13. An electronic device comprising an antenna assembly according to any one of claims 10 to 12.
CN202210541794.7A 2022-05-17 2022-05-17 SAR detection device, antenna assembly and electronic equipment Pending CN117110728A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210541794.7A CN117110728A (en) 2022-05-17 2022-05-17 SAR detection device, antenna assembly and electronic equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210541794.7A CN117110728A (en) 2022-05-17 2022-05-17 SAR detection device, antenna assembly and electronic equipment

Publications (1)

Publication Number Publication Date
CN117110728A true CN117110728A (en) 2023-11-24

Family

ID=88804402

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210541794.7A Pending CN117110728A (en) 2022-05-17 2022-05-17 SAR detection device, antenna assembly and electronic equipment

Country Status (1)

Country Link
CN (1) CN117110728A (en)

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