CN213151006U

CN213151006U - Antenna device and electronic apparatus

Info

Publication number: CN213151006U
Application number: CN202022197169.4U
Authority: CN
Inventors: 黄武鑫; 李偲
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2020-05-26
Filing date: 2020-05-26
Publication date: 2021-05-07
Anticipated expiration: 2030-05-26
Also published as: CN211929698U

Abstract

The embodiment of the application provides an antenna device and electronic equipment, the antenna device includes: a radiator comprising a ground point; one end of the grounding conductor is connected with the grounding point, and the other end of the grounding conductor is grounded; the near field communication chip is used for providing differential excitation current, and the part between two ends of the radiating body is used for transmitting the differential excitation current; the grounding conductor is used for providing a return path and a return path for the differential excitation current. In the antenna device, the radiator is grounded through the grounding conductor, and the grounding conductor can provide a return path of the differential excitation current and a return path of the differential excitation current, so that the part of the differential excitation current returning to the ground returns to the radiator, thereby reducing the loss of the differential excitation current in the transmission process and improving the performance of the NFC antenna.

Description

Antenna device and electronic apparatus

The present application is filed as a divisional application entitled "antenna device and electronic apparatus" with application number 202020911426.3, application date 26/5/2020.

Technical Field

The present disclosure relates to the field of communications technologies, and in particular, to an antenna device and an electronic device.

Background

With the development of communication technology, electronic devices such as smart phones have more and more functions, and communication modes of the electronic devices are more diversified. For example, recently, electronic devices are increasingly available to implement Near Field Communication (NFC) functions. Therefore, how to reasonably design the NFC antenna of the electronic device becomes a difficult problem.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides an antenna device and electronic equipment, which can reduce the loss of differential excitation current in the transmission process and improve the performance of an NFC antenna.

An embodiment of the present application provides an antenna apparatus, including:

a radiator comprising a ground point;

one end of the grounding conductor is connected with the grounding point, and the other end of the grounding conductor is grounded;

the near field communication chip comprises a first differential signal end and a second differential signal end, wherein the first differential signal end and the second differential signal end are used for providing differential excitation current, the first differential signal end and the second differential signal end are respectively and electrically connected with two ends of the radiator, and the part between the two ends is used for transmitting the differential excitation current;

wherein the ground conductor is used for providing a return path and a return path for the differential excitation current.

An embodiment of the present application further provides an electronic device, including:

an antenna device, the antenna device being the above antenna device;

the antenna device comprises a metal frame, wherein metal branches are formed on the metal frame, and the metal branches form a radiating body of the antenna device.

The antenna device provided by the embodiment of the application is provided with the grounding conductor, the radiator is grounded through the grounding conductor, the grounding conductor can provide a return path of differential excitation current and a return path of the differential excitation current, and the return path of the differential excitation current enables a part of the differential excitation current to return to the radiator, so that the loss of the differential excitation current in the transmission process can be reduced, and the performance of the NFC antenna is improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings used in the description of the embodiments will be briefly introduced below. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

Fig. 1 is a first structural schematic diagram of an electronic device according to an embodiment of the present application.

Fig. 2 is a schematic view of a first structure of an antenna device according to an embodiment of the present application.

Fig. 3 is a second structural schematic diagram of an electronic device according to an embodiment of the present application.

Fig. 4 is a schematic diagram of a second structure of an antenna apparatus according to an embodiment of the present application.

Fig. 5 is a schematic diagram of current transmission in the antenna device shown in fig. 2.

Fig. 6 is a schematic structural diagram of a third antenna device according to an embodiment of the present application.

Fig. 7 is a schematic diagram of a fourth structure of an antenna apparatus according to an embodiment of the present application.

Fig. 8 is a schematic structural diagram of a fifth antenna device according to an embodiment of the present application.

Fig. 9 is a schematic diagram of a sixth structure of an antenna apparatus according to an embodiment of the present application.

Fig. 10 is a schematic diagram of a seventh structure of an antenna device according to an embodiment of the present application.

Fig. 11 is an eighth structural schematic diagram of an antenna apparatus according to an embodiment of the present application.

Fig. 12 is a schematic diagram of a ninth structure of an antenna device according to an embodiment of the present application.

Fig. 13 is a schematic diagram of a tenth structure of an antenna apparatus according to an embodiment of the present application.

Fig. 14 is a third schematic structural diagram of an electronic device according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The embodiment of the application provides electronic equipment. The electronic device may be a smart phone, a tablet computer, or other devices, and may also be a game device, an AR (Augmented Reality) device, an automobile device, a data storage device, an audio playing device, a video playing device, a notebook computer, a desktop computing device, or other devices.

Referring to fig. 1, fig. 1 is a schematic view of a first structure of an electronic device 100 according to an embodiment of the present disclosure.

The electronic device 100 includes a display screen 10, a housing 20, a circuit board 30, and a battery 40.

The display screen 10 is disposed on the casing 20 to form a display surface of the electronic device 100 for displaying images, texts, and other information. The Display screen 10 may include a Liquid Crystal Display (LCD) or an Organic Light-Emitting Diode (OLED) Display screen.

It will be appreciated that a cover plate may also be provided over the display screen 10 to protect the display screen 10 from scratching or water damage. The cover plate may be a transparent glass cover plate, so that a user can observe contents displayed on the display screen 10 through the cover plate. For example, the cover plate may be a glass cover plate of sapphire material.

The housing 20 is used to form an outer contour of the electronic apparatus 100 so as to accommodate electronic devices, functional components, and the like of the electronic apparatus 100, while forming a sealing and protecting function for the electronic devices and functional components inside the electronic apparatus. For example, the camera, the circuit board, and the vibration motor of the electronic device 100 may be disposed inside the housing 20. The housing 20 may include a middle frame, a metal frame, and a battery cover.

The middle frame may have a thin plate-like or sheet-like structure, or may have a hollow frame structure. The middle frame is used for providing a supporting function for the electronic devices or functional components in the electronic device 100 so as to mount the electronic devices or functional components of the electronic device 100 together. For example, the middle frame may be provided with a through groove, a protrusion, a through hole, and the like, so as to facilitate installation of the electronic device or the functional component of the electronic apparatus 100. It is understood that the material of the middle frame may include metal or plastic.

The metal bezel is disposed around the periphery of the middle frame, so that the metal bezel can be formed on the outer periphery of the electronic device 100. It can be understood that the metal frame and the middle frame may be formed separately or integrally.

The battery cover is connected with the middle frame. For example, the battery cover may be attached to the center frame by an adhesive such as a double-sided tape to achieve connection with the center frame. The battery cover is used for sealing the electronic devices and functional components of the electronic device 100 inside the electronic device 100 together with the middle frame and the display screen 10, so as to protect the electronic devices and functional components of the electronic device 100. It will be appreciated that the battery cover may be integrally formed. In the molding process of the battery cover, a post-camera mounting hole and other structures can be formed on the battery cover. It is understood that the material of the battery cover may also include metal or plastic.

A circuit board 30 is disposed inside the housing 20. For example, the circuit board 30 may be mounted on a middle frame of the case 20 to be fixed, and the circuit board 30 is sealed inside the electronic device by a battery cover. The circuit board 30 may be a main board of the electronic device 100. One or more of functional components such as a processor, a camera, an earphone interface, an acceleration sensor, a gyroscope, and a motor may also be integrated on the circuit board 30. Meanwhile, the display screen 10 may be electrically connected to the circuit board 30 to control the display of the display screen 10 by a processor on the circuit board 30.

The battery 40 is disposed inside the case 20. For example, the battery 40 may be mounted on a middle frame of the case 20 to be fixed, and the battery 40 is sealed inside the electronic device by a battery cover. Meanwhile, the battery 40 is electrically connected to the circuit board 30 to enable the battery 40 to supply power to the electronic device 100. The circuit board 30 may be provided thereon with a power management circuit. The power management circuit is used to distribute the voltage provided by the battery 40 to the various electronic devices in the electronic apparatus 100.

The electronic device 100 is further provided with an antenna device 200. The antenna apparatus 200 is used for implementing a wireless Communication function of the electronic device 100, for example, the antenna apparatus 200 may be used for implementing a Near Field Communication (NFC) function. The antenna device 200 is disposed inside the housing 20 of the electronic apparatus 100. It is understood that some components of the antenna device 200 may be integrated on the circuit board 30 inside the housing 20, for example, the signal processing chip and the signal processing circuit in the antenna device 200 may be integrated on the circuit board 30. In addition, some components of the antenna device 200 may be disposed directly inside the housing 20. For example, the radiator of the antenna device 200 may be directly disposed inside the housing 20.

Referring to fig. 2, fig. 2 is a first structural schematic diagram of an antenna device 200 according to an embodiment of the present disclosure.

The antenna device 200 includes a radiator 21, a near field communication chip (NFC chip) 22, and a first non-near field communication chip 23.

The radiator 21 includes a ground point 21a, and the ground point 21a is grounded. The ground point 21a may be connected to a primary ground of the electronic device 100, for example, to a primary ground on the circuit board 30.

Wherein the ground point 21a divides the radiator 21 into two parts, namely a first part 211 and a second part 212. The first portion 211 is located at one end of the radiator 21, and the second portion 212 is located at the opposite end of the radiator 21. It is understood that the ground point 21a is a potential zero point, and thus the potentials of the first portion 211 and the second portion 212 are both greater than 0. Therefore, it can also be understood that the ground point 21a divides the radiator 21 into the first portion 211 and the second portion 212 in potential.

It is understood that the radiator 21 may be any radiator structure in the electronic device 100. For example, the radiator 21 may be a separately disposed radiator, may be a printed circuit on the circuit board 30, may be a metal branch formed on a middle frame of the electronic device 100, and the like. The radiator 21 may be rigid or flexible. The material of the radiator 21 may include copper, magnesium, aluminum, silver, and other materials with high conductivity.

Referring to fig. 3, fig. 3 is a schematic view of a second structure of the electronic device 100 according to the embodiment of the present disclosure.

The electronic device 100 includes a metal bezel 50. The metal bezel 50 may be formed as part of the housing 20. The metal frame 50 may be, for example, an aluminum alloy frame, a magnesium alloy frame, or the like. The metal bezel 50 may surround the periphery of the middle frame of the electronic device 100. Wherein, metal branches 51 are formed on the metal frame 50. For example, a first slit 52 and a second slit 53 may be provided at intervals on the metal bezel 50, and the metal branch 51 may be formed between the first slit 52 and the second slit 53. The radiator 21 of the antenna device 200 includes the metal branch 51. That is, the metal branch 51 forms the radiator 21.

It can be understood that the metal branch 51 may be formed on a long side of the metal frame 50, as shown in fig. 3. In other embodiments, the metal branches 51 may also be formed at short sides, corners, and the like of the metal frame 50.

Accordingly, the radiator 21 may be formed by the metal bezel 50 without separately providing the radiator 21 on the electronic device 100, so that the design of the antenna may be simplified.

In the description of the present application, it is to be understood that terms such as "first", "second", and the like are used merely to distinguish one similar element from another, and are not to be construed as indicating or implying relative importance or implying any indication of the number of technical features indicated.

With continued reference to fig. 2, the NFC chip 22 may be used to provide a differential excitation current. Wherein the differential excitation current comprises two current signals. The two current signals are identical in amplitude and opposite in phase, or are understood to be 180 degrees out of phase. In addition, the differential excitation current is a balanced signal. It can be understood that the analog signal is an unbalanced signal if directly transmitted during the transmission process; if the original analog signal is inverted and then the inverted analog signal and the original analog signal are transmitted simultaneously, the inverted analog signal and the original analog signal are called balanced signals. Compared with an unbalanced signal, the balanced signal has better anti-interference performance.

The NFC chip 22 may be disposed on the circuit board 30 of the electronic device 100 or a smaller separate circuit board may be disposed in the electronic device 100 and the NFC chip 22 may be integrated onto the separate circuit board. The separate circuit board may be, for example, a flexible circuit board in the electronic device 100.

The NFC chip 22 includes a first differential signal terminal 221 and a second differential signal terminal 222. For example, the first differential signal terminal 221 may be a positive (+) port of the NFC chip 22, and the second differential signal terminal 222 may be a negative (-) port of the NFC chip 22. The first differential signal terminal 221 and the second differential signal terminal 222 are used for providing the differential excitation current. For example, the differential excitation current provided by the NFC chip 22 may be output through the first differential signal terminal 221 and flow back into the NFC chip 22 through the second differential signal terminal 222, thereby forming a current loop.

The first differential signal terminal 221 and the second differential signal terminal 222 are electrically connected to two ends of the radiator 21, respectively. The two ends are opposite ends of the radiator 21, where one end may be an end where the first portion 211 is located, and the other end may be an end where the second portion 212 is located. For example, the first differential signal terminal 221 is electrically connected to the first portion 211 of the radiator 21, and the second differential signal terminal 222 is electrically connected to the second portion 212 of the radiator 21. Thus, the first differential signal terminal 221, the first portion 211, the second portion 212, and the second differential signal terminal 222 may form a signal loop, and the first portion 211 and the second portion 212 may be used to transmit the differential excitation current, that is, a portion between the two terminals is used to transmit the differential excitation current. It can be understood that when the differential excitation current is transmitted in the portion between the two ends, the NFC signal may be radiated to the outside, so as to implement the NFC function of the electronic device 100. Therefore, the portion between the two ends may be used as an NFC antenna, that is, the first portion 211 and the second portion 212 may be used as NFC antennas, so as to implement an NFC function of the electronic device 100.

It is understood that the radiator 21 may be provided with a feeding point for feeding the differential excitation current, for example, the radiator 21 includes a feeding point 21c and a feeding point 21 d. The feeding point 21c may be referred to as a second feeding point, and the feeding point 21d may be referred to as a third feeding point. The second feeding point 21c and the third feeding point 21d are located on opposite sides of the grounding point 21 a. For example, the second feeding point 21c may be located at one end of the radiator 21, and the third feeding point 21d may be located at the other end of the radiator 21.

Wherein the first differential signal terminal 221 is electrically connected to the second feeding point 21c, and the second differential signal terminal 222 is electrically connected to the third feeding point 21 d. Thus, the NFC chip 22 can feed the differential excitation current to the radiator 21 through the second feeding point 21c and the third feeding point 21 d.

The first non-near-field communication chip 23 may be one of a cellular communication chip, a Wi-Fi (Wireless Fidelity) chip, a GPS (Global Positioning System) chip, and a BT (Bluetooth) chip, and is configured to implement a corresponding communication function.

The first non-near-field communication chip 23 may be provided on the circuit board 30 of the electronic device 100 or may be integrated on a separate circuit board in the electronic device 100. The first non-near-field communication chip 23 is configured to provide a first non-near-field communication excitation current. Wherein the first non-near-field communication chip 23 is electrically connected to the radiator 21. For example, a feeding point 21b may be further disposed on the radiator 21, and the feeding point 21b may be referred to as a first feeding point. The first non-near-field communication chip 23 is electrically connected to the first feeding point 21b,

thus, the first non-near-field communication chip 23 may feed the first non-near-field communication excitation current to the radiator 21 through the first feeding point 21 b. A portion between the first feeding point 21b and the ground point 21a may be used for transmitting the first non-near-field communication excitation current. It can be understood that when the first non-near-field communication excitation current is transmitted between the first feeding point 21b and the ground point 21a, a first non-near-field communication signal may be radiated to the outside, so as to implement a first non-near-field communication function of the electronic device 100. Therefore, a portion between the first feeding point 21b and the ground point 21a may function as a first non-near-field communication antenna, implementing a first non-near-field communication function of the electronic device 100.

In some embodiments, as shown in fig. 2, the second feeding point 21c is located on the same side of the ground point 21a as the first feeding point 21 b. Wherein the second feeding point 21c is located at a greater distance from the grounding point 21a than the first feeding point 21b is located at from the grounding point 21 a.

It should be noted that the frequency of the NFC signal is usually 13.56MHz, the frequency of the cellular communication signal is usually above 700MHz, the frequency of the Wi-Fi signal is usually 2.4GHz or 5GHz, the frequency of the GPS signal usually includes multiple frequency bands such as 1.575GHz, 1.227GHz, 1.381GHz, and 1.841GHz, and the frequency of the BT signal is usually 2.4 GHz. Thus, the NFC signal is a low frequency signal relative to the cellular communication signal, Wi-Fi signal, GPS signal, BT signal, while the cellular communication signal, Wi-Fi signal, GPS signal, BT signal are all high frequency signals. Alternatively, it may be understood that the NFC signal is a low frequency signal and the first non-near-field communication signal is a high frequency signal.

In addition, as known from the quarter-wave resonance principle, when a wireless signal is transmitted, the lower the frequency of the wireless signal is, the longer the effective radiation length required by the antenna is; the higher the frequency of the radio signal, the shorter the effective radiation length required for the antenna. Therefore, when the distance between the second feeding point 21c and the grounding point 21a is set to be larger than the distance between the first feeding point 21b and the grounding point 21a, the effective radiation length of the NFC antenna can be increased, thereby improving the performance of the NFC antenna.

In some embodiments, referring to fig. 4, fig. 4 is a schematic diagram of a second structure of an antenna apparatus 200 according to an embodiment of the present disclosure.

Wherein the second feeding point 21c coincides with the first feeding point 21 b. That is, the NFC chip 22 shares the feeding point 21b (or 21c) with the first non-near-field communication chip 23. For example, when the first non-near-field communication chip 23 is a low-frequency cellular communication chip, that is, a portion between the first feeding point 21b and the grounding point 21a is used as a low-frequency cellular antenna, since the effective radiation length of the low-frequency cellular antenna itself is long, the low-frequency cellular antenna can be reused as an NFC antenna. Accordingly, the number of feeding points on the radiator 21 can be reduced, and thus the design of the radiator 21 can be simplified.

In the antenna device 200 provided in the embodiment of the present application, a portion between two ends of the radiator 21 electrically connected to the first differential signal terminal 221 and the second differential signal terminal 222 may be used as an NFC antenna, for example, a portion between the second feeding point 21c and the third feeding point 21d may be used as an NFC antenna, and a portion between the first feeding point 21b and the ground point 21a may be used as a first non-near-field communication antenna, so that multiplexing of a portion between the first feeding point 21b and the ground point 21a, that is, multiplexing of the first non-near-field communication antenna, may be implemented, and thus design of the NFC antenna may be simplified.

Referring to fig. 5, fig. 5 is a schematic diagram illustrating current transmission in the antenna device 200 shown in fig. 2.

The differential excitation current provided by the NFC chip 22 may be output to one end of the radiator 21 through one differential signal terminal (e.g., the first differential signal terminal 221), for example, output to one end where the first portion 211 is located, then be transmitted from the first portion 211 to the other end, for example, be transmitted to one end where the second portion 212 is located, and finally flow back to the NFC chip 22 through the other differential signal terminal (e.g., the second differential signal terminal 222) from the second portion 212, so as to implement transmission of the differential excitation current.

The first non-near-field communication excitation current provided by the first non-near-field communication chip 23 is output to the radiator 21 through the first feeding point 21b, transmitted to the grounding point 21a, and finally returned to the ground, so as to realize transmission of the first non-near-field communication excitation current.

It should be noted that, during the transmission of the differential excitation current, when the differential excitation current passes through the grounding point 21a, a part of the current is directly transmitted to the other end of the radiator 21 across the grounding point 21a, for example, the current I₁The signal is directly transmitted from the end where the second feeding point 21c is located to the end where the third feeding point 21d is located across the grounding point 21 a; another part of the current flows back to ground through the grounding point 21a, e.g. current I₂To ground through the ground point 21 a; in the current flowing back to the ground, a part of the current flows back to the radiator 21 through the ground point 21a and is continuously transmitted to the NFC chip 22, for example, a part of the current I₃The ground point 21a returns to the radiator 21 and the transmission is continued. Wherein, the current I₁Can be expressed as a first current, current I₂Can be expressed as a second current, current I₃Can be written as a third current.

Wherein, the current I₁A current I which occupies most of the differential excitation current₁And current I₂The sum of the two is the differential excitation current, I, output by the NFC chip 22₁And current I₃The sum is the differential excitation current that finally flows back into the NFC chip 22, where the current I₃Less than current I₂. That is, the NFC chip 22 outputs a differential excitation current of I₁And I₂And the differential excitation current that eventually flows back to the NFC chip 22 is I₁And I₃. Therefore, the differential excitation current output by the NFC chip 22 will cause partial loss in the transmission process, and the lost current is I₂And I₃The difference of (a). It can be understood that the differential excitation current is lossy, i.e. the NFC signal radiated to the outside by the radiator 21 is lossy.

In order to reduce the loss of the differential excitation current output by the NFC chip 22 during transmission, the ground structure of the radiator 21 may be designed to reduce the current I₂Finally, the current I is reduced₂And current I₃The difference between them.

In some embodiments, referring to fig. 6, fig. 6 is a schematic structural diagram of a third antenna device 200 according to an embodiment of the present disclosure.

The antenna structure 200 also includes a ground conductor 210. One end of the ground conductor 210 is connected to the ground point 21a, and the other end of the ground conductor 210 is grounded. For example, the electronic device 100 includes a metal bezel 60, which metal bezel 60 may form a system ground for the electronic device 100. Wherein the other end of the grounding conductor 210 can be connected to the metal middle frame 60 to realize grounding. The ground conductor 210 may also be understood as a metal connection rib position between the radiator 21 and the metal middle frame 60. It is understood that the ground conductor 210 may be integrally formed with the metal center frame 60, for example, by an injection molding process.

The ground isThe conductor 210 is used to provide a return path for the first non-near-field communication excitation current and to provide a return path and a return path for a portion of the differential excitation current. The return path may be understood as a path through which current flows to a system ground, and the return path may be understood as a path through which current flows from the system ground to the radiator 21. For example, the ground conductor 210 may be used to flow the first non-near-field communication excitation current to system ground, and may be used to flow the second current I of the differential excitation currents₂To system ground and for supplying a third current I of said differential excitation currents₃From there systematically back to the radiator 21.

Wherein, it can be understood that the differential excitation current provided by the NFC chip 22 includes the first current I₁The second current I₂And the third current I₃. The first current I₁Flowing through the radiator 21, the second current I₂The third current I returns to the ground through the grounding conductor 210₃And returns to the radiator 21 through the ground conductor 210. Wherein the third current I₃Is less than the second current I₂The current value of (1).

It will be appreciated that the effective current path of the differential excitation current on the radiator 21 is substantially equal to the length of the radiator 21 minus the width of the ground conductor 210. Therefore, the larger the width of the ground conductor 210, the shorter the effective current path of the differential excitation current on the radiator 21, and thus the more the NFC performance is attenuated. Conversely, the smaller the width of the ground conductor 210, the longer the effective current path of the differential excitation current on the radiator, and thus the less impact on NFC performance. From another perspective, the greater the width of the ground conductor 210, the greater the second current I of the differential excitation current flowing through the ground conductor 210 back to ground₂The larger the resulting loss, the more the NFC performance is degraded. Conversely, the smaller the width of the ground conductor 210, the smaller the second current I of the differential excitation current flowing through the ground conductor 210 back to ground₂The smaller the size, the more effective the losses can be reduced, thus reducing the ground conductor 2Impact of the setting of 10 on NFC performance. It will be appreciated that the second current I₂The magnitude of the current value of (a) is in positive correlation with the width of the ground conductor 210 in the extending direction of the radiator 21. That is, the larger the width of the ground conductor 210, the larger the second current I₂The larger; conversely, the smaller the width of the ground conductor 210, the smaller the second current I₂The smaller.

In some embodiments, as shown in fig. 6, the ground conductor 210 is provided with a through slot 210 a. The through-groove 210a penetrates the ground conductor 210. The through-slots 210a divide the ground conductor 210 into a first conductor 210b and a second conductor 210 c. The sum of the widths of the first conductor 210b and the second conductor 210c is smaller than the width of the ground conductor 210.

It can be understood that the through-slot 210a divides the ground conductor 210 into a first conductor 210b and a second conductor 210c, i.e., the ground conductor 210 is hollowed out through the through-slot 210 a. Thus, the sum of the widths of the first conductor 210b and the second conductor 210c formed by hollowing out the ground conductor 210 is smaller than the width of the ground conductor 210. In some embodiments, the first conductor 210b and the second conductor 210c are the same width. That is, the width of the first conductor 210b and the width of the second conductor 210c remain equal.

Wherein the first conductor 210b is configured to provide a return path for the first non-near-field communication excitation current and a return path for a portion of the differential excitation current. For example, the first conductor 210b is used for providing a return path for the first non-near-field communication excitation current and for providing the second current I₂Providing a return path to ground. The second conductor 210c is used to provide a return path for a portion of the differential excitation current. For example, the second conductor 210c is used for the third current I₃A return flow path is provided.

It can be understood that, after the through-slot 210a divides the ground conductor 210 into a first conductor 210b and a second conductor 210c, the first conductor 210b is used for providing the second current I₂Supply backGround path, therefore the second current I₂The magnitude of the current value of (a) is positively correlated with the width of the first conductor 210 b.

Since the sum of the widths of the first conductor 210b and the second conductor 210c is smaller than the width of the ground conductor 210, the width of the first conductor 210b is smaller than the width of the ground conductor 210. That is, the second current I is opposite to the case where the through groove 210a is not provided₂Has a reduced width, so that the second current I can be reduced₂. In addition, the second current I₂When decreasing, the third current I₃Will also decrease proportionally, so that the second current I can be reduced₂And the third current I₃The difference between the two, namely the loss of the differential excitation current provided by the NFC chip 22 during transmission, is reduced, thereby improving the performance of the NFC antenna. In addition, after the through-slot 210a is disposed on the ground conductor 210, the first conductor 210b is formed to ensure that the first non-near-field communication excitation current flows back to the ground, so that the transmission of the first non-near-field communication excitation current, that is, the function of the first non-near-field communication antenna, is not affected. The following experimental data are exemplified: research of the research personnel on the technical scheme of the application finds that when the through groove 210a is not formed in the conductor structure 210, the measured magnetic field strength of the NFC is 16.8526 a/m; when the through-slot 210a is provided in the conductor structure 210, otherwise, the NFC magnetic field strength is measured at 18.133 a/m. It can be seen that, after the through-groove 210a is disposed on the conductor structure 210, the NFC magnetic field strength can be improved by 7.6%, that is, the performance of the NFC antenna can be improved by 7.6%.

In some embodiments, referring to fig. 7, fig. 7 is a schematic diagram of a fourth structure of an antenna apparatus 200 according to an embodiment of the present disclosure.

The antenna device 200 further includes a first Flexible Printed Circuit (FPC) 251. The first differential signal terminal 221 is electrically connected to the radiator 21 through the first flexible circuit board 251. For example, the first differential signal terminal 221 may be electrically connected to the second feeding point 21c of the radiator 21 through the first flexible circuit board 251. Therefore, the first flexible circuit board 251 may be used to transmit the differential excitation current. It can be understood that when the first flexible circuit board 251 transmits the differential excitation current, the NFC signal may also be radiated to the outside, so that the effective radiation length of the NFC antenna may be increased, and the performance of the NFC antenna may be improved.

In some embodiments, the antenna device 200 further comprises a first magnetic field enhancer 253. The material of the first magnetic field enhancer 253 can include an insulating material. For example, the first magnetic field enhancer 253 may include a ferrite layer formed of a ferrite material, which may be a nickel copper zinc-based material having a prescribed content of iron oxide, copper oxide, zinc oxide, and nickel oxide. In addition, the ferrite material may further include some auxiliary materials, such as bismuth oxide, silicon oxide, magnesium oxide, cobalt oxide, etc. in a predetermined content. The first magnetic field enhancer 253 may be used to enhance the magnetic field strength.

Wherein the first magnetic field enhancer 253 is disposed on the first flexible circuit board 251 side. For example, the first magnetic field enhancer 253 may be disposed at the bottom of the first flexible circuit board 251 and abut against the first flexible circuit board 251. The first magnetic field enhancer 253 may be configured to enhance the strength of a magnetic field generated when the first flexible circuit board 251 transmits a differential excitation current, so as to improve the NFC signal strength, and further improve the performance of the NFC antenna.

In some embodiments, referring to fig. 8, fig. 8 is a schematic diagram of a fifth structure of an antenna apparatus 200 according to an embodiment of the present disclosure.

Wherein the antenna device 200 further comprises a second flexible circuit board 252. The second differential signal terminal 222 is electrically connected to the radiator 21 through the second flexible circuit board 252. For example, the second differential signal terminal 222 may be electrically connected to the third feeding point 21d of the radiator 21 through the second flexible circuit board 252. Thus, the second flexible circuit board 252 may be used to transmit the differential excitation current. It can be understood that when the second flexible circuit board 252 transmits the differential excitation current, the NFC signal may also be radiated to the outside, so that the effective radiation length of the NFC antenna may be increased, and the performance of the NFC antenna may be improved.

In some embodiments, the antenna device 200 further comprises a second magnetic field enhancer 254. The material of the second magnetic field enhancement member 254 may also include an insulating material. For example, the second magnetic field enhancer 254 may also include ferrite. The second magnetic field enhancer 254 may be used to enhance the magnetic field strength.

Wherein the second magnetic field enhancing body 254 is arranged on the side of the second flexible circuit board 252. For example, the second magnetic field enhancer 254 may be disposed at a bottom portion of the second flexible circuit board 252 and abut the second flexible circuit board 252. The second magnetic field enhancer 254 may be configured to enhance the strength of the magnetic field generated when the second flexible circuit board 252 transmits the differential excitation current, so as to improve the NFC signal strength, and thus improve the performance of the NFC antenna.

In some embodiments, referring to fig. 9, fig. 9 is a schematic diagram of a sixth structure of an antenna apparatus 200 according to an embodiment of the present application.

Wherein the antenna device 200 further comprises a circuit board 26. The circuit board 26 may be a main circuit board of the electronic device 100, for example, the circuit board 26 may be a circuit board 30 of the electronic device 100, and the circuit board 26 may also be a circuit board separately provided in the electronic device 100. Wherein, the circuit board 26 is provided with a first printed circuit 261 and a second printed circuit 262 at intervals. Both the first printed wiring 261 and the second printed wiring 262 may be used to transmit electrical signals.

The first differential signal terminal 221 of the NFC chip 22 is electrically connected to the radiator 21 through the first printed circuit 261. For example, the first differential signal terminal 221 may be electrically connected to the second feeding point 21c of the radiator 21 through the first printed wiring 261. Thus, the first printed wiring 261 may be used to transmit the differential excitation current provided by the NFC chip 22 to increase the effective radiation length of the NFC antenna, thereby improving the performance of the NFC antenna.

The second differential signal terminal 222 of the NFC chip 22 is electrically connected to the radiator 21 through the second printed circuit 262. For example, the second differential signal terminal 222 may be electrically connected to the third feeding point 21d of the radiator 21 through the second printed wiring 262. Thus, the second printed wiring 262 may also be used to transmit the differential excitation current provided by the NFC chip 22 to increase the effective radiation length of the NFC antenna, thereby improving the performance of the NFC antenna.

It should be noted that, in some other embodiments, only one printed circuit may be disposed on the circuit board 26, for example, only the first printed circuit 261 is disposed, or only the second printed circuit 262 is disposed, and the effective radiation length of the NFC antenna may also be increased by transmitting the differential excitation current through the disposed first printed circuit 261 or the disposed second printed circuit 262, so as to improve the performance of the NFC antenna.

In some embodiments, referring to fig. 10, fig. 10 is a schematic diagram illustrating a seventh structure of an antenna apparatus 200 according to an embodiment of the present disclosure.

Wherein the antenna arrangement 200 further comprises a second non-near-field communication chip 24. The second non-near-field communication chip 24 may also be one of a cellular communication chip, a Wi-Fi chip, a GPS chip, and a BT chip, and is configured to implement a corresponding communication function.

The second non-near-field communication chip 24 may also be provided on the circuit board 30 of the electronic device 100 or may also be integrated on a separate circuit board in the electronic device 100. The second non-near-field communication chip 24 is configured to provide a second non-near-field communication excitation current.

Wherein the radiator 21 further includes a fourth feeding point 21 e. The fourth feeding point 21e is located on a different side of the grounding point 21a from the first feeding point 21 b. For example, the first feeding point 21b is located on the first portion 211, and the fourth feeding point 21e is located on the second portion 212.

The second non-near-field communication chip 24 is electrically connected to the radiator 21. For example, the second non-near-field communication chip 24 may be electrically connected to the fourth feeding point 21 e. Thereby, a portion between the fourth feeding point 21e and the ground point 21a may be used for transmitting the second non-near-field communication excitation current. It can be understood that when the second non-near-field communication excitation current is transmitted between the fourth feeding point 21e and the ground point 21a, a second non-near-field communication signal may be radiated to the outside, so as to implement a second non-near-field communication function of the electronic device 100. Therefore, a portion between the fourth feeding point 21e and the ground point 21a may serve as a second non-near-field communication antenna, implementing a second non-near-field communication function of the electronic device 100.

In some embodiments, as shown in fig. 10, the third feeding point 21d and the fourth feeding point 21e are located on the same side of the ground point 21 a. The third feeding point 21d is located at a greater distance from the grounding point 21a than the fourth feeding point 21e is located at from the grounding point 21 a. It can be understood that when the distance between the third feeding point 21d and the grounding point 21a is set to be greater than the distance between the fourth feeding point 21e and the grounding point 21a, the effective radiation length of the NFC antenna can be increased, thereby improving the performance of the NFC antenna.

In some embodiments, referring to fig. 11, fig. 11 is an eighth structural schematic diagram of an antenna apparatus 200 according to an embodiment of the present application.

Wherein the third feeding point 21d coincides with the fourth feeding point 21 e. That is, the NFC chip 22 and the second non-near-field communication chip 24 share the feeding point 21d (or 21 e). For example, when the second non-near-field communication chip 24 is a low-frequency cellular communication chip, that is, the portion between the fourth feeding point 21e and the grounding point 21a is used as a low-frequency cellular antenna, since the effective radiation length of the low-frequency cellular antenna itself is long, the low-frequency cellular antenna can be reused as an NFC antenna. Accordingly, the number of feeding points on the radiator 21 can be reduced, and thus the design of the radiator 21 can be simplified.

It should be noted that, in practical applications, the second non-near-field communication chip 24 and the first non-near-field communication chip 23 may be chips of the same type or the same function, for example, both may be medium-high frequency cellular communication chips, and are used to implement the medium-high frequency cellular communication function; the second non-near-field communication chip 24 may be, for example, a GPS chip for implementing GPS communication, for example, for implementing GPS L5 frequency band communication, and the first non-near-field communication chip 23 may be, for example, a medium-high frequency cellular communication chip for implementing a medium-high frequency cellular communication function.

It should be noted that, when the antenna device 200 includes the first non-near-field communication chip 23 and the second non-near-field communication chip 24 at the same time, the first non-near-field communication chip 23 and the second non-near-field communication chip 24 may be integrated into one chip, and the integrated chip may provide the first non-near-field communication excitation current and the second non-near-field communication excitation current at the same time.

As can be appreciated, with the development of communication technology and the advent of the 5G era, more and more antennas are required to be arranged on electronic devices such as smart phones, and the communication frequency of the antennas is higher, for example, the 4G communication is gradually transited to the 5G communication, so that each antenna enjoys less and less layout space, and the radiation length of each antenna is shorter and shorter. In the antenna device 200 provided in the embodiment of the present application, a portion between the first feeding point 21b and the grounding point 21a on the radiator 21 may be used as a first non-near-field communication antenna, a portion between the fourth feeding point 21e and the grounding point 21a may be used as a second non-near-field communication antenna, and a portion between the first feeding point 21b and the fourth feeding point 21e may be reused as an NFC antenna, so that the NFC antenna may simultaneously reuse the first non-near-field communication antenna and the second non-near-field communication antenna, thereby increasing a radiation length of the NFC antenna and improving performance of the NFC antenna.

In addition, since the NFC antenna can be used for multiplexing the first non-near-field communication antenna and the second non-near-field communication antenna at the same time, the NFC antenna can multiplex the first non-near-field communication antenna and the second non-near-field communication antenna without affecting the radiation length of the NFC antenna, regardless of the position of the grounding point 21a on the radiator 21, that is, regardless of the change in the radiation length of the first non-near-field communication antenna and regardless of the change in the radiation length of the second non-near-field communication antenna, so that the radiation length of the NFC antenna can be ensured to meet the requirement of the NFC antenna, and the performance of the NFC antenna can be improved.

In some embodiments, please refer to fig. 12, and fig. 12 is a schematic diagram illustrating a ninth structure of an antenna device 200 according to an embodiment of the present disclosure.

The antenna device 200 further includes a first matching circuit 271, a second matching circuit 272, a third matching circuit 273, a first filter circuit 281, a second filter circuit 282, a third filter circuit 283, and a fourth filter circuit 284. It will be appreciated that the matching circuit may also be referred to as a matching network, a tuning circuit, a tuning network, etc. The filter circuit may also be referred to as a filter network.

The first differential signal terminal 221 and the second differential signal terminal 222 of the NFC chip 22 are electrically connected to two ends of the radiator 21 through the first matching circuit 271, respectively. For example, the first matching circuit 271 is electrically connected to the first differential signal terminal 221 of the NFC chip 22, the second differential signal terminal 222 of the NFC chip 22, the second feeding point 21c of the radiator 21, and the third feeding point 21d of the radiator 21. The first matching circuit 271 is used for matching the impedance when the differential excitation current is transmitted partially between the two ends, for example, for matching the impedance when the differential excitation current is transmitted partially between the second feeding point 21c and the third feeding point 21 d.

The first matching circuit 271 includes a first input end 271a, a second input end 271b, a first output end 271c, and a second output end 271 d. The first input terminal 271a is electrically connected to the first differential signal terminal 221, the second input terminal 271b is electrically connected to the second differential signal terminal 222, the first output terminal 271c is electrically connected to the second feeding point 21c, and the second output terminal 271d is electrically connected to the third feeding point 21 d.

The first filter circuit 281 is disposed between the first differential signal terminal 221 and the first input terminal 271 a. The first filter circuit 281 is configured to filter a first interference signal between the first differential signal terminal 221 and the first input terminal 271 a. The first interference signal is an electrical signal other than the differential excitation current provided by the NFC chip 22.

The second filter circuit 282 is disposed between the second differential signal terminal 222 and the second input terminal 271 b. The second filter circuit 282 is configured to filter a second interference signal between the second differential signal terminal 222 and the second input terminal 271 b. The second interference signal is an electrical signal other than the differential excitation current provided by the NFC chip 22.

Wherein the first non-near-field communication chip 23 is electrically connected to the first feeding point 21b through the second matching circuit 272. For example, the second matching circuit 272 is electrically connected to the first non-near-field communication chip 23 and the first feeding point 21b of the radiator 21. The second matching circuit 272 is configured to match an impedance when the first non-near-field communication excitation current is transmitted partially between the first feeding point 21b and the ground point 21 a.

The third filter circuit 283 is disposed between the first non-near-field communication chip 23 and the second matching circuit 272. The third filter circuit 283 is configured to filter out a third interference signal between the first non-near-field communication chip 23 and the second matching circuit 272. The third interference signal is an electrical signal other than the first non-near-field communication excitation current provided by the first non-near-field communication chip 23.

Wherein the second non-near-field communication chip 24 is electrically connected to the fourth feeding point 21e through the third matching circuit 273. For example, the third matching circuit 273 is electrically connected to the second non-near-field communication chip 24 and the fourth feeding point 21e of the radiator 21. The third matching circuit 273 is configured to match the impedance when the second non-near-field communication excitation current is transmitted partially between the fourth feeding point 21e and the ground point 21 a.

The fourth filter circuit 284 is disposed between the second non-near-field communication chip 24 and the third matching circuit 273. The fourth filter circuit 284 is configured to filter out a fourth interference signal between the second non-near-field communication chip 24 and the third matching circuit 273. The fourth interference signal is an electrical signal other than the second non-near-field communication excitation current provided by the second non-near-field communication chip 24.

It is understood that the first matching circuit 271, the second matching circuit 272 and the third matching circuit 273 may each include a circuit formed by connecting capacitors and inductors in series or in parallel. The first filter circuit 281, the second filter circuit 282, the third filter circuit 283 and the fourth filter circuit 284 may also include a circuit formed by connecting capacitors and inductors in series or in parallel.

In some embodiments, please refer to fig. 13, and fig. 13 is a schematic diagram illustrating a tenth structure of an antenna apparatus according to an embodiment of the present application.

The first matching circuit 271 may include, for example, four capacitors C1, C2, C3, C4. The capacitor C1 is connected in series with the first differential signal terminal 221 of the NFC chip 22, and the capacitor C2 is connected in series with the second differential signal terminal 222 of the NFC chip 22. The capacitor C3 is connected in series with the capacitor C4 and in parallel with the NFC chip 22 after series connection, and the capacitor C3 is connected to ground with the capacitor C4. It is understood that the capacitance values of the capacitors C1, C2, C3 and C4 can be set according to actual needs.

The first filter circuit 281 may include, for example, an inductor L1 and a capacitor C5. Wherein an inductor L1 is connected in series between the first differential signal terminal 221 and the first matching circuit 271, and a capacitor C5 is connected in parallel with the NFC chip 22 and grounded. It is understood that the inductance of the inductor L1 and the capacitance of the capacitor C5 can be set according to actual needs.

The second filter circuit 282 may include, for example, an inductor L2 and a capacitor C6. Wherein an inductor L2 is connected in series between the second differential signal terminal 222 and the first matching circuit 271, and a capacitor C6 is connected in parallel with the NFC chip 22 and to ground. It is understood that the inductance of the inductor L2 and the capacitance of the capacitor C6 can be set according to actual needs.

The second matching circuit 272 may for example comprise capacitors C7, C8. Wherein the capacitor C7 is connected in series between the first feeding point 21b of the radiator 21 and the first non-near-field communication chip 23, and the capacitor C8 is connected in parallel with the first non-near-field communication chip 23 and grounded. It is understood that the capacitance values of the capacitors C7 and C8 can be set according to actual needs.

The third filter circuit 283 may include, for example, an inductor L3 and a capacitor C9. Wherein the inductor L3 is connected in series between the first non-near-field communication chip 23 and the second matching circuit 272, and the capacitor C9 is connected in parallel with the first non-near-field communication chip 23 and grounded. It is understood that the inductance of the inductor L3 and the capacitance of the capacitor C9 can be set according to actual needs.

The third matching circuit 273 may comprise, for example, capacitors C10, C11. Wherein the capacitor C10 is connected in series between the fourth feeding point 21e of the radiator 21 and the second non-near-field communication chip 24, and the capacitor C11 is connected in parallel with the second non-near-field communication chip 24 and grounded. It is understood that the capacitance values of the capacitors C10 and C11 can be set according to actual needs.

The fourth filter circuit 284 may include, for example, an inductor L4 and a capacitor C12. Wherein the inductor L4 is connected in series between the second non-near-field communication chip 24 and the third matching circuit 273, and the capacitor C12 is connected in parallel with the second non-near-field communication chip 24 and grounded. It is understood that the inductance of the inductor L4 and the capacitance of the capacitor C12 can be set according to actual needs.

In some embodiments, please refer to fig. 14, and fig. 14 is a schematic structural diagram of a third electronic device 100 according to an embodiment of the present disclosure.

The electronic device 100 further includes a camera module 70. The camera module 70 may be used for photographing, and the like. The camera module 70 may be disposed on a circuit board or a middle frame of the electronic device 100 for fixing.

Wherein, the current path of the differential excitation current provided by the NFC chip 22 surrounds the camera module 70. The current path of the differential excitation current is a current path of the differential excitation current provided by the NFC chip 22, which is output through one differential signal terminal, flows through the radiator 21, and finally flows back to the other differential signal terminal of the NFC chip 22. For example, the current path may include a current path formed by the first differential signal terminal 221 of the NFC chip 22, the radiator 21, and the second differential signal terminal 222 of the NFC chip 22.

As shown in fig. 14, an NFC IC is the NFC chip 22, IC 1 is the first non-near-field communication chip 23, IC 2 is the second non-near-field communication chip 24, M1 is the first matching circuit 271, M2 is the second matching circuit 272, and M3 is the third matching circuit 273.

The antenna device and the electronic device provided in the embodiments of the present application are described in detail above. The principles and implementations of the present application are described herein using specific examples, which are presented only to aid in understanding the present application. Meanwhile, for those skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims

1. An antenna device, comprising:

the radiator comprises grounding points and first feeding points which are arranged at intervals;

one end of the grounding conductor is connected with the grounding point, and the other end of the grounding conductor is connected with a metal middle frame forming a system ground so as to realize grounding of the grounding conductor;

a first non-near-field communication chip for providing a first non-near-field communication excitation current, the first non-near-field communication chip being electrically connected to the first feeding point, a portion between the first feeding point and the ground point being used for transmitting the first non-near-field communication excitation current;

2. The antenna device of claim 1, wherein:

the grounding conductor is provided with a through groove, the through groove divides the grounding conductor into a first conductor and a second conductor, and the sum of the widths of the first conductor and the second conductor is smaller than the width of the grounding conductor.

3. The antenna device of claim 2, wherein:

the first conductor is used for providing a return path for part of the differential excitation current, and the second conductor is used for providing a return path for part of the differential excitation current.

4. The antenna device of claim 2, wherein:

the differential excitation current comprises a first current flowing through the radiator, a second current returning to the ground through the ground conductor, and a third current flowing back to the radiator through the ground conductor, wherein the current value of the third current is smaller than that of the second current.

5. The antenna device of claim 4, wherein:

the first conductor is used for providing a return path for the second current, and the second conductor is used for providing a return path for the third current.

6. The antenna device of claim 5, wherein:

the magnitude of the current value of the second current is positively correlated with the width of the first conductor.

7. The antenna device of claim 2, wherein:

the first conductor and the second conductor are of equal width.

8. The antenna device according to any of claims 1 to 7, characterized in that:

the radiator further comprises a second feeding point and a third feeding point, and the second feeding point and the third feeding point are positioned on different sides of the grounding point;

the first differential signal terminal is electrically connected to the second feeding point, and the second differential signal terminal is electrically connected to the third feeding point.

9. The antenna device of claim 8, wherein:

the distance between the second feeding point and the grounding point is larger than the distance between the first feeding point and the grounding point.

10. The antenna device of claim 8, wherein:

the second feeding point coincides with the first feeding point.

11. The antenna device of claim 8, wherein:

the radiator further comprises a fourth feeding point, and the fourth feeding point and the first feeding point are positioned on the opposite side of the grounding point;

the antenna device further comprises a second non-near-field communication chip, the second non-near-field communication chip is used for providing second non-near-field communication excitation current, the second non-near-field communication chip is electrically connected with the fourth feeding point, and a part between the fourth feeding point and the grounding point is used for transmitting the second non-near-field communication excitation current.

12. The antenna device of claim 11, wherein:

the distance between the third feeding point and the grounding point is greater than the distance between the fourth feeding point and the grounding point.

13. The antenna device of claim 11, wherein:

the third feeding point coincides with the fourth feeding point.

14. The antenna device according to any one of claims 1 to 7, further comprising:

the first differential signal end is electrically connected with the radiator through the first flexible circuit board, and the first flexible circuit board is used for transmitting the differential excitation current.

15. The antenna device of claim 14, further comprising:

the first magnetic field reinforcement body is arranged on one side of the first flexible circuit board and used for reinforcing the strength of a magnetic field generated when the first flexible circuit board transmits the differential excitation current.

16. The antenna device according to any one of claims 1 to 7, further comprising:

and the second differential signal end is electrically connected with the radiator through the second flexible circuit board, and the second flexible circuit board is used for transmitting the differential excitation current.

17. The antenna device of claim 16, further comprising:

and the second magnetic field reinforcement body is arranged on one side of the second flexible circuit board and is used for reinforcing the strength of a magnetic field generated when the second flexible circuit board transmits the differential excitation current.

18. The antenna device according to any one of claims 1 to 7, further comprising:

the circuit board is provided with a first printed circuit;

the first differential signal terminal is electrically connected to the radiator through the first printed circuit, and the first printed circuit is configured to transmit the differential excitation current.

19. The antenna device of claim 18, wherein:

the circuit board is also provided with a second printed circuit which is spaced from the first printed circuit;

the second differential signal terminal is electrically connected to the radiator through the second printed circuit, and the second printed circuit is configured to transmit the differential excitation current.

20. An electronic device, comprising:

an antenna device according to any one of claims 1 to 19;

21. The electronic device of claim 20, wherein a first gap and a second gap are disposed at an interval on the metal bezel, and the metal branch is formed between the first gap and the second gap.

22. The electronic device of claim 20 or 21, further comprising:

and the current path of the differential excitation current surrounds the camera module.