CN215953876U - Antenna module and related electronic equipment - Google Patents

Abstract

The utility model discloses an antenna module and related electronic equipment. The antenna module includes: a first electrode and a second electrode; the first electrode is an antenna body or is connected with the antenna body and keeps equal voltage with the antenna body; the first electrode and the second electrode can be coupled to form a mutual capacitance; when an object approaches the antenna module, the first electrode can shield an electric field between the second electrode and the object. According to the utility model, the part caused by temperature in the antenna self-capacitance variation can be obtained according to the change of the mutual capacitance between the first electrode and the second electrode, and the change of the antenna self-capacitance caused by the approach of a human body can be really judged, so that the accurate control of the antenna transmitting power is realized.

Description

Antenna module and related electronic equipment

Technical Field

The present invention relates to electronic circuits, and particularly to an antenna module and a related electronic device.

Background

With the development of information technology and electronics manufacturing industry, electronic devices such as mobile phones and tablet computers using wireless communication are becoming more and more popular worldwide, and in recent years, many national governments and telecommunication industry departments will come up with industry standards regarding radio frequency and microwave radiation from the viewpoint of human health of users, and require electronic device manufacturers to keep the electromagnetic wave Absorption ratio (SAR), i.e., the electromagnetic power absorbed or consumed by a unit mass of a human body under the action of an external electromagnetic field, within a relatively low level range. Therefore, when a human body approaches these electronic devices, the electronic devices should have a mechanism to detect the approach of the human body so as to actively reduce the antenna transmission power to meet the standard requirements.

In the existing electronic device, it is a common practice to determine whether a human body approaches by multiplexing an antenna and detecting a Self-Capacitance (Self-Capacitance) change of the antenna, and when it is detected that the human body approaches the electronic device, the antenna transmission power of the mobile device can meet the SAR standard by reducing the antenna transmission power.

SUMMERY OF THE UTILITY MODEL

The inventor finds that, in the prior art, a change in self-capacitance of an antenna may be affected by various factors, for example, a change in temperature may also affect a change in self-capacitance of the antenna, which may cause misjudgment, thereby adversely affecting a normal radio frequency function of an antenna of an electronic device.

In a first aspect, an embodiment of the present invention provides an antenna module, including: a first electrode and a second electrode; the first electrode is an antenna body or is connected with the antenna body and keeps equal voltage with the antenna body;

the first electrode and the second electrode can be coupled to form a mutual capacitance;

when an object approaches the antenna module, the first electrode can shield an electric field between the second electrode and the object.

In one embodiment, the second electrode is a metal sheet or a metal wire.

In one embodiment, the first electrode is arranged parallel or substantially parallel to the second electrode, and a projection of the first electrode on a surface of the second electrode covers the second electrode.

In one embodiment, in a mutual capacitance formed by coupling the first electrode and the second electrode, the first electrode is an excitation electrode, and the second electrode is an induction electrode; or the first electrode is an induction electrode and the second electrode is an excitation electrode.

In one embodiment, when the first electrode or the second electrode is used as an excitation electrode, the voltage of an excitation signal of the first electrode or the second electrode is kept constant.

In a second aspect, an embodiment of the utility model provides an electronic device, including the antenna module and the capacitance detection chip;

and the first electrode and the second electrode in the antenna module are connected with the capacitance detection chip.

In one embodiment, the second electrode is disposed on a side of the first electrode facing the inside of the electronic device.

In one embodiment, the first electrode is the antenna itself; the electronic device further includes: the radio frequency transceiver unit, the self-capacitance detection circuit, the first filtering path and the second filtering path;

the first electrode is respectively connected with the first filtering path and the second filtering path;

the output end of the first filtering path is connected with the radio frequency transceiver unit, and the output end of the second filtering path is connected with the self-capacitance detection circuit.

In one embodiment, the first filtering path comprises a capacitor C2 and an inductor L3, wherein the capacitor C2 is connected to the first electrode at one end, connected to the radio frequency transceiver unit at the other end, and grounded through the inductor L3;

the second filtering path comprises an inductor L1, a resistor R1 and a capacitor C1, one end of the inductor L1 is connected with the first electrode, the other end of the inductor L1 is connected with the resistor R1 in series, and the inductor L1 is grounded through the capacitor C1; the other end of the resistor R1 is connected with the self-capacitance detection circuit.

In one embodiment, the electronic device is a mobile terminal;

the antenna module is any one or more of the following: the antenna comprises a main antenna module, a diversity antenna module, a GPS antenna module, an FM earphone hole antenna module and a Wifi BT antenna module.

The technical scheme provided by the embodiment of the utility model has the beneficial effects that at least:

in the antenna module and the related electronic device provided by the embodiment of the utility model, the first electrode and the second electrode can be coupled to form mutual capacitance, when an object (such as a human body) approaches the antenna module, the first electrode can shield an electric field between the second electrode and the object, and by such design, the mutual capacitance between the first electrode and the second electrode cannot be influenced by the electric field of a foreign object, and can accurately reflect the influence of temperature, so that accurate measurement of temperature change is realized, on the basis of the measurement of the temperature change, through the detection of the self-capacitance of the antenna (the first electrode), a part caused by the temperature change can be eliminated, and the rest can be used for judging whether the object approaches, so that the accurate judgment of the object approach is realized, and on the basis, the transmitting power of the antenna of the electronic device using the antenna can be more accurately controlled, so that the electronic device meets the SAR standard, but also can ensure the better radio frequency function.

In the antenna module, the second electrode may be a part of the existing electronic device, such as a metal wire or a metal sheet on the PCB near the first electrode. The design can realize the functions of detection and accurate control without additionally adding new hardware, and has low realization cost and compact integral structure of the electronic equipment.

Additional features and advantages of the utility model 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 utility model. The objectives and other advantages of the utility model will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the principles of the utility model and not to limit the utility model. In the drawings:

fig. 1 is a schematic structural diagram of a first electrode and a second electrode in an antenna module according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of mutual capacitance electric fields provided by an embodiment of the present invention;

fig. 3 is a flowchart of a method for manufacturing an antenna module according to an embodiment of the present invention;

FIG. 4 is a flow chart of a method for detecting a temperature change according to an embodiment of the present invention;

FIG. 5 is a flowchart of a method for determining a capacitance variation caused by an object approaching according to an embodiment of the present invention;

FIG. 6 is a circuit diagram of a self-capacitance measurement between a first electrode and ground according to an embodiment of the present invention;

fig. 7 is a flowchart of a method for adjusting the transmission power of an antenna module according to an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of a device for detecting temperature variation according to an embodiment of the present invention;

fig. 9 is a schematic structural diagram of an apparatus for determining an antenna capacitance variation caused by an object approaching according to an embodiment of the present invention;

fig. 10 is a schematic structural diagram of a device for adjusting the transmission power of an antenna module according to an embodiment of the present invention;

fig. 11 is a schematic structural diagram of an electronic device according to an embodiment of the present invention;

fig. 12 is a schematic structural diagram of each antenna module in the mobile terminal according to the embodiment of the present invention.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

The problem of current utilize electronic equipment's antenna self-capacitance to detect when judging whether have the human body to be close, because the self-capacitance change that antenna temperature variation arouses leads to adopting the mode of self-capacitance to carry out human body and be close when detecting, can't distinguish whether the self-capacitance change that leads to because the temperature leads to, still lead to the fact the self-capacitance change that the human body is close to the human body, lead to judging the precision and reduce is solved. The inventor finds that if the variable quantity caused by the temperature is eliminated in the variable quantity of the self-capacitance of the antenna, the accuracy of human body approaching detection can be further ensured, and the normal radio frequency function of the electronic equipment is ensured. Based on the above, the embodiment of the utility model provides an antenna module, a temperature change detection method, a human body approach detection method, an antenna transmission power adjustment method and an antenna transmission power adjustment device. The following respectively describes in detail specific embodiments of the antenna module, the temperature change detection method, the human body proximity detection method, and the antenna transmission power adjustment method and apparatus, with reference to the accompanying drawings.

An antenna module provided in an embodiment of the present invention, as shown in fig. 1, includes: a first electrode 1 and a second electrode 2; the first electrode 1 is an antenna body or is connected with the antenna body and keeps equal voltage with the antenna body; wherein:

the first electrode 1 and the second electrode 2 may be coupled to form a Mutual-Capacitance (Mutual-Capacitance);

when an object approaches the antenna module, the first electrode 1 can shield an electric field between the second electrode 2 and the object.

In one embodiment, the second electrode 2 may be a metal sheet or a metal wire, a non-metal sheet that is electrically conductive, or a non-metal wire that is electrically conductive.

The second electrode 2 may be a metal sheet or a metal wire that is independently disposed, or may be a metal wire in an existing circuit in the electronic device, for example, a metal wire on a PCB near the antenna body. The design of reusing the existing components can realize the functions of detection and accurate control without additionally adding new hardware, and has low realization cost and compact integral structure of the electronic equipment.

The first electrode 1 is directly the antenna body itself, or an electrode connected to the antenna body and grounded, and is also a metal sheet or a metal wire, a conductive non-metal sheet or a conductive non-metal wire.

The non-metal sheet (or non-metal wire) may be made of non-metal conductive material, including but not limited to graphene. The embodiment of the present invention does not limit what conductive material is used.

The first electrode 1 is used as a shielding electrode, and in order to achieve a good shielding effect, the first electrode 1 and the second electrode 2 are arranged in parallel or substantially in parallel, and the surface area of the first electrode 1 is large enough to enable the projection of the first electrode 1 on the surface of the second electrode 2 to completely cover the surface of the second electrode 2.

Substantially parallel may for example mean that the first electrode 1 and the second electrode 2 are approximately parallel and at an angle to each other.

With such an arrangement, the first electrode 1 can function to shield the electric field between the second electrode and the human body when the human body approaches, and the following detailed description is provided with reference to the accompanying drawings:

referring to the schematic diagram of the mutual capacitance electric field shown in fig. 2, a is a second electrode, C is a first electrode, and B is an object (e.g., a human body, etc.) that may be close to an antenna module in an electronic device. The second electrode is arranged on one side of the first electrode, in fig. 2 there is an electric field between the ACs, while the electric field lines between a and B are cut off by (i.e. shielded by) C.

As can be seen from fig. 2, in the electronic device, the second electrode 2 is disposed in a direction in which the first electrode 1 is away from the outside of the electronic device, that is, a direction in which the first electrode 1 faces the inside of the electronic device. In structural relation, the first electrode 1 should be disposed between the second electrode 2 and a plane that can be contacted by a human body, in a specific implementation, for example, in a scene of a specific electronic product such as a mobile phone, the first electrode 1 and the second electrode 2 are disposed in a mobile phone housing, the second electrode 2 is disposed in a direction in which the first electrode 1 faces the inside of the mobile phone housing, and what the human body can contact is an outer surface of the mobile phone housing, so that the first electrode 1 can play a role in shielding an electric field between the second electrode 2 and the human body, so that a mutual capacitance between the first electrode 1 and the second electrode 2 is not affected by an external object.

In order to achieve a better shielding effect, in addition to the surface area of the first electrode 1 being large enough to shield the second electrode 2, the distance between the first electrode 1 and the second electrode 2 should be much smaller than the distance between an object other than the electronic device and the first electrode 1, of course, the distance between the first electrode 1 and the second electrode 2 may also affect the mutual capacitance between the two electrodes, the smaller the distance between the two electrodes is, the larger the mutual capacitance is, and conversely, the smaller the mutual capacitance is, and in specific implementation, the distance may also be selected according to the size of the required mutual capacitance.

The second electrode 2 is used as a shielding electrode, which can shield an electric field between the first electrode 1 and an external object (such as a human body), so that the mutual capacitance formed by the coupling of the first electrode 1 and the second electrode 2 can be ensured, and the influence of the external object can not be caused, thereby truly reflecting the influence of the temperature on the self-capacitance of the antenna.

In one embodiment, in the mutual capacitance formed by coupling the first electrode 1 and the second electrode 2, the first electrode 1 is an excitation electrode and the second electrode 2 is a sensing electrode, or vice versa, the first electrode 1 is a sensing electrode and the second electrode 2 is an excitation electrode.

If the first electrode 1 is used as an excitation electrode, the change of the mutual capacitance between the first electrode 1 and the second electrode 2 can be reflected due to the change of the amplitude of the induction signal at the side of the second electrode 2, so that the change of the mutual capacitance can be obtained by monitoring the change of the amplitude of the induction signal of the induction electrode, namely the second electrode 2;

conversely, if the second electrode 2 is used as the excitation electrode, the magnitude change of the mutual capacitance between the first electrode 1 and the second electrode 2 can also be obtained by monitoring the change of the amplitude of the sensing signal of the sensing electrode, i.e. the first electrode 1.

In the embodiment of the present invention, if an excitation signal is applied to the first electrode, the first electrode 1 is used as an excitation electrode, and due to the existence of the mutual capacitance, the excitation signal can be sensed on the second electrode 2, and the magnitude and the phase shift of the received signal are related to the excitation signal and the magnitude of the mutual capacitance.

The driving signal can be input by a driving signal source, the specific circuit form of the driving signal source can be designed according to different driving signals, and the specific implementation mode can refer to the prior art.

In one embodiment, when the first electrode 1 or the second electrode 2 is used as an excitation electrode, the voltage of the excitation signal is kept constant, in other words, the excitation signal circuit outputs the excitation signal with constant voltage to the first electrode 1 or the second electrode 2.

By designing in this way, the first electrode 1 can cut off the electric field between the second electrode 2 and the external object well, so as to realize the shielding effect on the second electrode 2 and ensure that the electric field between the first electrode 1 and the second electrode 2 is not affected by the approach of the external object.

Based on the structure of the antenna module, an embodiment of the present invention further provides a method for manufacturing an antenna module, which is shown in fig. 3 and includes the following steps:

s31, arranging a first electrode;

s32, arranging a second electrode, wherein the first electrode and the second electrode can be coupled to form mutual capacitance; and when an object approaches the antenna module, the first electrode can shield an electric field between the second electrode and the object.

In the above steps S31 and S32, the setting means to prepare or reuse the components in the existing circuit, for example, the first electrode and the second electrode may be prepared separately, a metal sheet or a metal wire may be prepared on one side of the first electrode to form the second electrode, so as to ensure that the two electrodes can be coupled to form a mutual capacitance, and when an object approaches, the first electrode can shield the second electrode. For another example, the first electrode may be reused as the antenna itself, and/or the second electrode may be reused as a metal sheet or a metal wire near the self-capacitance detection sensor connected with the first electrode, such as a metal wire on a PCB, and the like.

In the above manufacturing method, the first electrode and the second electrode need to be insulated to be coupled to form a mutual capacitance. In the case where the first electrode and the second electrode are closely spaced, an insulating medium may be used therebetween. The selection of the insulating medium can refer to the selection of mutual capacitance in the prior art, and is not described in detail herein.

Based on the design of the antenna module, an embodiment of the present invention further provides a method for detecting a temperature change, which can be applied to the antenna module, and as shown in fig. 4, the method includes the following steps:

s41, keeping the voltage of the first electrode constant, detecting the size of mutual capacitance formed by the coupling of the first electrode and the second electrode, and monitoring whether the size of the mutual capacitance changes; if the change of the mutual capacitance is detected, the following step S42 is executed;

and S42, determining the temperature variation of the antenna module according to the size variation of the mutual capacitance.

In an embodiment, in the step S42, the temperature variation of the antenna module is determined according to the magnitude variation of the mutual capacitance, and in a specific implementation, the following manner may be used:

and calculating the temperature variation of the antenna module according to the variation of the mutual capacitance and the temperature coefficient of the mutual capacitance.

Optionally, the temperature coefficient of the mutual capacitance may be obtained by pre-measuring when the antenna module of the electronic device is designed, and pre-stored in the memory of the electronic device for later calling when a processor of the electronic device performs calculation.

In one embodiment, the change in the mutual capacitance can be obtained by detecting the change in the output voltage of a mutual capacitance front end detection circuit connected to the first electrode and the second electrode, but the embodiment of the present invention is not limited to the above detection method, and any method capable of detecting the change in the mutual capacitance may be used.

Based on the design of the antenna module, an embodiment of the present invention further provides a method for determining a capacitance variation caused by an object approaching, where the method is applied to the antenna module of the foregoing embodiment, and as shown in fig. 5, the method includes the following steps:

s51, keeping the voltage of the first electrode constant, and detecting the size of mutual capacitance formed by the coupling of the first electrode and the second electrode;

s52, detecting the size of a self-capacitance formed by the first electrode and the ground; if the mutual capacitance and the self-capacitance are monitored to be changed, executing the following step S53;

s53, determining the temperature variation of the antenna module according to the size variation of the mutual capacitance;

s54, determining the self-capacitance variation caused by the temperature of the antenna body according to the temperature variation and the temperature coefficient of the self-capacitance;

and S55, subtracting the size change of the self-capacitance of the antenna body caused by the temperature from the size change of the self-capacitance formed by the first electrode and the ground to obtain the self-capacitance change of the antenna body caused by the approach of the object.

Optionally, the temperature coefficient of the self-capacitance formed between the first electrode and the ground may be obtained by measuring in advance when the antenna module of the electronic device is designed, and may be stored in the memory of the electronic device in advance for later retrieval when the processor of the electronic device calculates.

The measurement of the self-capacitance formed by the first electrode and the ground can be carried out in various ways, for example, by using a circuit as shown in fig. 6, in which an Antenna (Antenna, i.e., the first electrode) connects two filter paths; the upper first filter path (high frequency filter path) comprises a capacitor C2 and an inductor L3, one end of the capacitor C2 is connected with the first electrode, the other end of the capacitor C2 is connected with a radio frequency transceiver unit (RF TRX), and the capacitor C3 is grounded; the low-frequency signals can be filtered out through a first filtering path, the high-frequency signals (functional signals) can pass through, and the output end P3 of the first filtering path is connected with the radio frequency transceiver unit; the lower second filtering path (low-frequency filtering path) comprises an inductor L1, a resistor R1 and a capacitor C1, one end of the inductor L1 is connected with the first electrode, the other end of the inductor L1 is connected with the resistor R1 in series, and the inductor L1 is grounded through the capacitor C1; one end of the resistor R1 is connected with the inductor L1 in series, and the other end is connected with the self-capacitance detection circuit; the high frequency signal is filtered out and the low frequency signal is filtered through a second filtering path, and the output end P1 of the second filtering path is connected to a self-capacitance detection circuit, such as a capacitive proximity Sensor (CAP Sensor).

The embodiment of the present invention is not limited to the above detection method, and any method capable of realizing self-capacitance between the first electrode and the ground may be used.

In the embodiment of the present invention, the object includes, but is not limited to, various charged objects, such as any part of a human body, and the like.

The steps S51 to S53 are similar to the steps of the method for detecting temperature variation, and are not described herein again.

In step S54, the following formula may be used to calculate the amount of change in the self-capacitance of the antenna body due to temperature.

The embodiment of the utility model also provides a method for judging whether the human body is close to the antenna module or not, which can be applied to the antenna module of the embodiment and comprises the following steps: and judging whether a human body approaches the antenna module at present according to the antenna capacitance variation caused by the approach of the object determined by the method.

Specifically, when the object is determined to be a human body, whether the value of the antenna capacitance variation caused by the approach of the object is greater than zero is judged, if so, it is determined that the human body is close to the antenna module at present, otherwise, it is determined that no human body is close to the antenna module.

There are various ways to determine whether an approaching object is a human body, and the method may refer to the prior art, such as various sensors (e.g., infrared sensors), to identify whether the object is a human body, which is not limited in the embodiments of the present invention.

In the process of determining whether an object approaches to cause the self-capacitance change of the antenna, the influence of temperature on the change of the self-capacitance can be avoided better, and the influence of an external charged object on the self-capacitance of the antenna is reflected, so that the aim of accurately controlling the transmitting power of the antenna is fulfilled.

Based on this, an embodiment of the present invention further provides a method for adjusting the transmission power of an antenna module, which is shown in fig. 7 and includes the following steps:

s71, determining whether a human body approaches the antenna module according to the judgment result obtained by the method for judging whether the human body approaches the antenna module currently; if it is determined that the human body approaches the antenna module, performing the following step S72;

and S72, reducing the transmitting power of the antenna module.

Under the condition that the relative position of the antenna structure and the electronic equipment using the antenna and a human body is fixed, the larger the output power of the antenna is, the higher the electric field intensity formed in the human body is, and the larger the radio frequency radiation power absorbed by the human body is. Therefore, in step S72, a specific value of the transmission power to be reduced may be considered according to the standard value of the SAR and the transmission power value of the current antenna, and a corresponding control signal is sent to an antenna transmission power control circuit (e.g., a power amplifier) to control the antenna transmission power.

The embodiment of the utility model realizes accurate detection of whether the human body approaches the antenna module based on the detection of the antenna self-capacitance variation caused by the temperature in the antenna module, thereby further realizing accurate control of the antenna transmitting power when the human body approaches, and ensuring that the electronic equipment using the antenna can ensure a better radio frequency function while meeting the SAR standard.

Based on the same concept, embodiments of the present invention further provide a device for detecting a temperature change, a device for determining an antenna capacitance variation caused by an object approaching, a device for determining whether there is a human body approaching an antenna, such as the antenna module, a device for adjusting a transmission power of the antenna module, a related system, a capacitance detection chip, an electronic device, and a computer-readable storage medium.

An embodiment of the present invention provides a device for detecting a temperature change, which is used to detect a temperature change of the antenna module, and as shown in fig. 8, the device includes:

a mutual capacitance detection unit 81, configured to detect a size of a mutual capacitance formed by coupling the first electrode and the second electrode, and monitor whether the size of the mutual capacitance changes;

and a temperature change determining unit 82, configured to determine a temperature change amount of the antenna module according to a change in the magnitude of the mutual capacitance.

In an embodiment, the temperature variation determining unit 82 is specifically configured to calculate a temperature variation of the antenna module according to a variation of the mutual capacitance and a temperature coefficient of the mutual capacitance.

An embodiment of the present invention further provides a temperature detection system, including: such as the antenna module and the device for detecting temperature variation.

An embodiment of the present invention provides an apparatus for determining an antenna capacitance variation caused by an object approaching, which is shown in fig. 9 and includes:

a first detection unit 91, configured to keep the voltage of the first electrode constant, and detect the magnitude of a mutual capacitance formed by coupling the first electrode and the second electrode;

a second detection unit 92 for detecting the magnitude of a self-capacitance formed by the first electrode and the ground;

the temperature variation determining unit 93 is configured to determine a temperature variation of the antenna module according to a variation of the mutual capacitance if it is monitored that both the mutual capacitance and the self-capacitance are changed;

a temperature-induced self-capacitance change determining unit 94 for determining a self-capacitance change amount caused by temperature based on a change amount of temperature and a temperature coefficient of self-capacitance;

the object approach-induced self-capacitance change determining unit 95 is configured to subtract the magnitude change of the self-capacitance caused by the temperature from the magnitude change of the self-capacitance detected by the first detecting unit, so as to obtain a self-capacitance change caused by the object approach.

The embodiment of the present invention further provides a system for determining a capacitance variation caused by an object approaching, including: such as the antenna module and the device for determining the capacitance variation of the antenna caused by the approach of the object.

The embodiment of the present invention further provides a device for determining whether a human body approaches to the antenna module, the device including: and judging whether a human body approaches the module of the antenna module at present according to the antenna capacitance variation caused by the approach of the object determined by the method.

The embodiment of the utility model also provides a system for detecting human body proximity, which comprises: the antenna module and the device for judging whether a human body approaches the antenna module.

An embodiment of the present invention provides a device for adjusting transmit power of an antenna module, as shown in fig. 10, including:

a human body approach detection unit 101, configured to determine whether a human body approaches the antenna module according to the determination result obtained by the method for determining whether a human body approaches the antenna module;

and the transmitting power adjusting unit 102 is used for reducing the transmitting power of the antenna if the human body approaches the antenna module detected by the human body approach detection unit.

The embodiment of the utility model also provides an antenna transmission power control system, which comprises: the antenna module and the device for adjusting the transmission power of the antenna module are provided.

The embodiment of the utility model provides a capacitance detection chip, which comprises: a memory and a processor; wherein the memory stores a computer program that, when executed by the processor, enables the aforementioned method of detecting a temperature change or the aforementioned method of determining an amount of change in capacitance due to an object approaching to be implemented; or implementing the method for judging whether a human body is close to the antenna module or implementing the method for adjusting the transmitting power of the antenna module.

An electronic device provided in an embodiment of the present invention, referring to fig. 11, includes the antenna module and the capacitance detection chip 3;

the first electrode 1 and the second electrode 2 in the antenna module are connected with the capacitance detection chip 3.

The second electrode 2 is located in an area electromagnetically shielded in at least one direction by the first electrode 1;

the capacitance detection chip 3 can be respectively connected with the first electrode 1 and the second electrode 2 through leads; the capacitance detection chip 3, the first electrode 1 and the second electrode 2 may all be disposed inside a housing 3 of the electronic device.

In one embodiment, the second electrode 2 is disposed on a side of the first electrode 1 facing the inside of the electronic device.

The second electrode 2 is arranged on one side of the first electrode 1 facing the inside of the electronic device, when a human body approaches the electronic device, the first electrode 1 is close to the human body, and due to the shielding effect of the first electrode 1 on the second electrode 2, the mutual capacitance between the first electrode 1 and the second electrode 2 is insensitive to the approaching human body, and the accuracy of final detection is ensured.

Taking an electronic device as an example of a mobile terminal, referring to fig. 12, the mobile terminal includes a plurality of antenna modules, such as a main antenna module, a diversity antenna module, a GPS antenna module, an FM earphone jack antenna module, a Wifi BT (bluetooth) antenna module, and the like, wherein the GPS antenna module and the Wifi BT antenna module are located at an upper end of the mobile terminal, the diversity antenna module is located at a side edge of the mobile terminal, and the main antenna module is located at a lower end of the mobile terminal.

Unlike the conventional antenna module, in the antenna modules according to the embodiments of the present invention, the inner side of the antenna body is further provided with a second electrode, for example, as shown in fig. 12, in the main antenna module, the diversity antenna module, the GPS antenna module, and the Wifi BT antenna module, the antenna body is used as the first electrode, and the inner sides of the antenna bodies are respectively provided with a metal sheet as the second electrode, as shown by the black block in fig. 12. The metal sheet can be shielded by the corresponding antenna body, and when a human body approaches the outside of the mobile terminal (for example, operations such as touching, holding and the like), the mutual capacitance between the first electrode and the second electrode is not influenced by the outside human body. From the structure shown in fig. 12, the design improvement has less influence on the whole structure of the mobile terminal, and is easy to implement.

An embodiment of the present invention provides a computer-readable storage medium, on which computer instructions are stored, and the computer instructions, when executed by a processor, can implement the method for detecting a temperature change or the method for determining a capacitance change caused by an object approaching as described above; or implementing the method for judging whether a human body is close to the antenna module or implementing the method for adjusting the transmitting power of the antenna module.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the utility model. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (10)

1. An antenna module, comprising: a first electrode and a second electrode; the first electrode is an antenna body or is connected with the antenna body and keeps equal voltage with the antenna body;

the first electrode and the second electrode can be coupled to form a mutual capacitance;

when an object approaches the antenna module, the first electrode can shield an electric field between the second electrode and the object.

2. The antenna module of claim 1, wherein the second electrode is a metal sheet or a metal wire.

3. The antenna module of claim 1, wherein the first electrode is disposed parallel or substantially parallel to the second electrode, and a projection of the first electrode on a surface of the second electrode covers the second electrode.

4. The antenna module of claim 1, wherein the first electrode is an excitation electrode and the second electrode is an induction electrode in a mutual capacitance formed by coupling the first electrode and the second electrode; or the first electrode is an induction electrode and the second electrode is an excitation electrode.

5. The antenna module of claim 4, wherein the voltage of the driving signal is kept constant when the first electrode or the second electrode is used as a driving electrode.

6. An electronic device, comprising the antenna module according to any one of claims 1 to 5 and a capacitance detection chip;

and the first electrode and the second electrode in the antenna module are connected with the capacitance detection chip.

7. The electronic device according to claim 6, wherein the second electrode is provided on a side of the first electrode facing an inside of the electronic device.

8. The electronic device of claim 6, wherein the first electrode is the antenna itself; the electronic device further includes: the radio frequency transceiver unit, the self-capacitance detection circuit, the first filtering path and the second filtering path;

the first electrode is respectively connected with the first filtering path and the second filtering path;

the output end of the first filtering path is connected with the radio frequency transceiver unit, and the output end of the second filtering path is connected with the self-capacitance detection circuit.

9. The electronic device of claim 8 wherein said first filtering path includes a capacitor C2 and an inductor L3, a capacitor C2 connected to said first electrode at one end and to said radio frequency transceiver unit at another end and to ground through an inductor L3;

the second filtering path comprises an inductor L1, a resistor R1 and a capacitor C1, one end of the inductor L1 is connected with the first electrode, the other end of the inductor L1 is connected with the resistor R1 in series, and the inductor L1 is grounded through the capacitor C1; the other end of the resistor R1 is connected with the self-capacitance detection circuit.

10. The electronic device of any of claims 6-9, wherein the electronic device is a mobile terminal;

the antenna module is any one or more of the following: the antenna comprises a main antenna module, a diversity antenna module, a GPS antenna module, an FM earphone hole antenna module and a Wifi BT antenna module.

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