Antenna device and electronic equipment

Abstract

The embodiment of the present application provides an antenna device and an electronic device, the antenna device comprising: a radiator, the radiator comprising a grounding point; a grounding conductor, one end of the grounding conductor is connected to the grounding point, and the other end of the grounding conductor is grounded; a near field communication chip, used to provide a differential excitation current, the portion between the two ends of the radiator is used to transmit the differential excitation current; the grounding conductor is used to provide a ground 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 both a ground return path for the differential excitation current and a return path for the differential excitation current, so that the differential excitation current that returns to the ground partially flows back to the radiator, thereby reducing the loss of the differential excitation current during the transmission process and improving the performance of the NFC antenna.

Description

[0001] This application is a divisional application with application number 202010456231.9, application date May 26, 2020, and invention name “Antenna device and electronic device”. Technical Field

[0002] The present application relates to the field of communication technology, and in particular to an antenna device and an electronic device. Background Art

[0003] With the development of communication technology, electronic devices such as smart phones can realize more and more functions, and the communication modes of electronic devices are also more diversified. For example, recently electronic devices can gradually realize the Near Field Communication (NFC) function. Therefore, how to reasonably design the NFC antenna of electronic devices has become a difficult problem. Summary of the invention

[0004] The embodiments of the present application provide an antenna device and an electronic device, which can reduce the loss of differential excitation current during transmission and improve the performance of an NFC antenna.

[0005] An embodiment of the present application provides an antenna device, including:

[0006] a radiator, the radiator comprising a ground point;

[0007] A grounding conductor, one end of which is connected to the grounding point and the other end of which is grounded;

[0008] A near field communication chip, comprising 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 to provide a differential excitation current, the first differential signal end and the second differential signal end are electrically connected to two ends of the radiator, respectively, and a portion between the two ends is used to transmit the differential excitation current;

[0009] The grounding conductor is used to provide a ground return path and a return current path for the differential excitation current.

[0010] The present application also provides an electronic device, including:

[0011] An antenna device, wherein the antenna device is the above-mentioned antenna device;

[0012] A metal frame having metal branches formed thereon, wherein the metal branches form the radiator of the antenna device.

[0013] In the antenna device provided in the embodiment of the present application, a grounding conductor is provided, and the radiator is grounded through the grounding conductor. The grounding conductor can provide both a ground return path for the differential excitation current and a return path for the differential excitation current, so that part of the differential excitation current that returns to the ground flows back to the radiator, thereby reducing the loss of the differential excitation current during the transmission process and improving the performance of the NFC antenna. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[0015] Figure 1 A first structural schematic diagram of an electronic device provided in an embodiment of the present application.

[0016] Figure 2 A first structural schematic diagram of an antenna device provided in an embodiment of the present application.

[0017] Figure 3 A second structural schematic diagram of an electronic device provided in an embodiment of the present application.

[0018] Figure 4 A second structural schematic diagram of the antenna device provided in an embodiment of the present application.

[0019] Figure 5 for Figure 2 Schematic diagram of current transmission in the antenna device shown.

[0020] Figure 6 A third structural schematic diagram of the antenna device provided in an embodiment of the present application.

[0021] Figure 7 A fourth structural schematic diagram of the antenna device provided in an embodiment of the present application.

[0022] Figure 8 A fifth structural schematic diagram of the antenna device provided in an embodiment of the present application.

[0023] Fig. 9 A sixth structural schematic diagram of the antenna device provided in an embodiment of the present application.

[0024] Fig.10 This is a seventh structural schematic diagram of the antenna device provided in an embodiment of the present application.

[0025] Fig.11 This is a schematic diagram of the eighth structure of the antenna device provided in an embodiment of the present application.

[0026] Fig.12 This is a ninth structural schematic diagram of the antenna device provided in an embodiment of the present application.

[0027] Fig.13 This is a tenth structural schematic diagram of the antenna device provided in an embodiment of the present application.

[0028] Fig.14 A third structural schematic diagram of the electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0030] The present application provides an electronic device, which may be a smartphone, a tablet computer, or a gaming device, an AR (Augmented Reality) device, an automotive device, a data storage device, an audio player, a video player, a laptop, a desktop computing device, etc.

[0031] refer to Figure 1 , Figure 1 A first structural diagram of an electronic device 100 provided in an embodiment of the present application.

[0032] The electronic device 100 includes a display screen 10 , a housing 20 , a circuit board 30 and a battery 40 .

[0033] The display screen 10 is disposed on the housing 20 to form a display surface of the electronic device 100 for displaying information such as images and texts. The display screen 10 may include a liquid crystal display (LCD) or an organic light-emitting diode display (OLED).

[0034] It is understandable that a cover plate may be provided on the display screen 10 to protect the display screen 10 from being scratched or damaged by water. The cover plate may be a transparent glass cover plate, so that the user can observe the content displayed on the display screen 10 through the cover plate. For example, the cover plate may be a sapphire glass cover plate.

[0035] The housing 20 is used to form the outer contour of the electronic device 100, so as to accommodate the electronic devices and functional components of the electronic device 100, and to seal and protect the electronic devices and functional components inside the electronic device. For example, the camera, circuit board, vibration motor and other functional components of the electronic device 100 can be arranged inside the housing 20. The housing 20 may include a middle frame, a metal frame and a battery cover.

[0036] The middle frame may be a thin plate or sheet-like structure, or a hollow frame structure. The middle frame is used to provide support for the electronic devices or functional components in the electronic device 100, so as to install the electronic devices and functional components of the electronic device 100 together. For example, the middle frame may be provided with structures such as through grooves, protrusions, through holes, etc., so as to facilitate the installation of the electronic devices or functional components of the electronic device 100. It is understandable that the material of the middle frame may include metal or plastic, etc.

[0037] The metal frame is disposed around the periphery of the middle frame, so that the metal frame can be formed on the outer periphery of the electronic device 100. It can be understood that the metal frame and the middle frame can be formed separately or integrally.

[0038] The battery cover is connected to the middle frame. For example, the battery cover can be attached to the middle frame by an adhesive such as double-sided tape to achieve connection with the middle frame. The battery cover is used to seal 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 to protect the electronic devices and functional components of the electronic device 100. It is understandable that the battery cover can be integrally formed. During the molding process of the battery cover, structures such as a rear camera mounting hole can be formed on the battery cover. It is understandable that the material of the battery cover can also include metal or plastic.

[0039] The circuit board 30 is arranged inside the housing 20. For example, the circuit board 30 can be mounted on the middle frame of the housing 20 for fixing, and the circuit board 30 can be sealed inside the electronic device through the battery cover. The circuit board 30 can be the main board of the electronic device 100. The circuit board 30 can also be integrated with one or more functional components such as a processor, a camera, an earphone interface, an acceleration sensor, a gyroscope, a motor, etc. At the same time, the display screen 10 can be electrically connected to the circuit board 30 so that the display of the display screen 10 can be controlled by the processor on the circuit board 30.

[0040] The battery 40 is disposed inside the housing 20. For example, the battery 40 can be mounted on the middle frame of the housing 20 for fixation, and the battery 40 can be sealed inside the electronic device by a battery cover. At the same time, the battery 40 is electrically connected to the circuit board 30 so that the battery 40 can power the electronic device 100. Among them, a power management circuit can be disposed on the circuit board 30. The power management circuit is used to distribute the voltage provided by the battery 40 to various electronic devices in the electronic device 100.

[0041] Among them, the electronic device 100 is also provided with an antenna device 200. The antenna device 200 is used to implement the wireless communication function of the electronic device 100. For example, the antenna device 200 can be used to implement the Near Field Communication (NFC) function. The antenna device 200 is arranged inside the housing 20 of the electronic device 100. It can be understood that some components of the antenna device 200 can 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 can be integrated on the circuit board 30. In addition, some components of the antenna device 200 can also be directly arranged inside the housing 20. For example, the radiator of the antenna device 200 can be directly arranged inside the housing 20.

[0042] Please refer to Figure 2 , Figure 2 This is a schematic diagram of the first structure of the antenna device 200 provided in an embodiment of the present application.

[0043] 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 .

[0044] The radiator 21 includes a grounding point 21 a , which is grounded. The grounding point 21 a can be connected to a main ground of the electronic device 100 , such as a main ground on the circuit board 30 .

[0045] The grounding point 21a divides the radiator 21 into two parts, namely, a first part 211 and a second part 212. The first part 211 is located at one end of the radiator 21, and the second part 212 is located at the other end opposite to the radiator 21. It can be understood that the grounding point 21a is a potential zero point, so the potentials of the first part 211 and the second part 212 are both greater than 0. Therefore, it can also be understood that the grounding point 21a divides the radiator 21 into the first part 211 and the second part 212 in terms of potential.

[0046] It can be understood that the radiator 21 can be any radiator structure in the electronic device 100. For example, the radiator 21 can be an independently arranged radiator, a printed circuit on the circuit board 30, or a metal branch formed on the middle frame of the electronic device 100, etc. The radiator 21 can be rigid or flexible. The material of the radiator 21 can include materials with high conductivity such as copper, magnesium, aluminum, and silver.

[0047] refer to Figure 3 , Figure 3 A second structural diagram of the electronic device 100 provided in an embodiment of the present application.

[0048] The electronic device 100 includes a metal frame 50. The metal frame 50 can be used as a part of the shell 20. The metal frame 50 can be, for example, an aluminum alloy frame, a magnesium alloy frame, etc. The metal frame 50 can be arranged around the periphery of the middle frame of the electronic device 100. A metal branch 51 is formed on the metal frame 50. For example, a first gap 52 and a second gap 53 can be arranged on the metal frame 50 at intervals, and the metal branch 51 is formed between the first gap 52 and the second gap 53. The radiator 21 of the antenna device 200 includes the metal branch 51. That is, the metal branch 51 forms the radiator 21.

[0049] It can be understood that the metal branches 51 can be formed on the long sides of the metal frame 50. Figure 3 In some other embodiments, the metal branches 51 may also be formed at the short sides, corners, etc. of the metal frame 50 .

[0050] Therefore, there is no need to separately provide the radiator 21 on the electronic device 100 , and the radiator 21 can be formed by the metal frame 50 , thereby simplifying the design of the antenna.

[0051] In the description of this application, it should be understood that terms such as "first" and "second" are only used to distinguish similar objects and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0052] Continue to refer Figure 2, the NFC chip 22 can be used to provide a differential excitation current. Wherein, the differential excitation current includes two current signals. The two current signals have the same amplitude and opposite phases, or it can be understood that the two current signals differ in phase by 180 degrees. In addition, the differential excitation current is a balanced signal. It can be understood that during the transmission process, if an analog signal is directly transmitted, it is an unbalanced signal; if the original analog signal is inverted, and then the inverted analog signal and the original analog signal are transmitted at the same time, the inverted analog signal and the original analog signal are called balanced signals. Compared with unbalanced signals, balanced signals have better anti-interference performance.

[0053] The NFC chip 22 may be disposed on the circuit board 30 of the electronic device 100, or a smaller independent circuit board may be disposed in the electronic device 100 and the NFC chip 22 may be integrated into the independent circuit board. The independent circuit board may be, for example, a flexible circuit board in the electronic device 100.

[0054] 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 to provide the differential excitation current. For example, the differential excitation current provided by the NFC chip 22 may be output via the first differential signal terminal 221, and flow back to the NFC chip 22 via the second differential signal terminal 222, thereby forming a current loop.

[0055] The first differential signal terminal 221 and the second differential signal terminal 222 are electrically connected to the two ends of the radiator 21, respectively. The two ends are opposite ends of the radiator 21, one end of which may be the end where the first part 211 is located, and the other end may be the end where the second part 212 is located. For example, the first differential signal terminal 221 is electrically connected to the first part 211 of the radiator 21, and the second differential signal terminal 222 is electrically connected to the second part 212 of the radiator 21. Thus, the first differential signal terminal 221, the first part 211, the second part 212, and the second differential signal terminal 222 may constitute a signal loop, and the first part 211 and the second part 212 may be used to transmit the differential excitation current, that is, the part between the two ends is used to transmit the differential excitation current. It can be understood that when the part between the two ends transmits the differential excitation current, an NFC signal may be radiated to the outside, thereby realizing the NFC function of the electronic device 100. Therefore, the portion between the two ends can be used as an NFC antenna, that is, the first portion 211 and the second portion 212 can be used as NFC antennas to implement the NFC function of the electronic device 100 .

[0056] It can be understood that a feeding point for feeding the differential excitation current can be set on the radiator 21, for example, the radiator 21 includes a feeding point 21c and a feeding point 21d. Among them, the feeding point 21c can be recorded as the second feeding point, and the feeding point 21d can be recorded as the third feeding point. The second feeding point 21c and the third feeding point 21d are located on the opposite side of the grounding point 21a. For example, the second feeding point 21c can be located at one end of the radiator 21, and the third feeding point 21d can be located at the other end of the radiator 21.

[0057] 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 21d. 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 21d.

[0058] 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, for realizing corresponding communication functions.

[0059] The first non-near field communication chip 23 can be arranged on the circuit board 30 of the electronic device 100, or can also be integrated on an independent circuit board in the electronic device 100. The first non-near field communication chip 23 is used to provide a first non-near field communication excitation current. Among them, the first non-near field communication chip 23 is electrically connected to the radiator 21. For example, a feeding point 21b can also be set on the radiator 21, and the feeding point 21b can be recorded as a first feeding point. The first non-near field communication chip 23 is electrically connected to the first feeding point 21b,

[0060] Thus, the first non-near field communication chip 23 can feed the first non-near field communication excitation current to the radiator 21 through the first feeding point 21b. The portion between the first feeding point 21b and the grounding point 21a can be used to transmit the first non-near field communication excitation current. It can be understood that when the portion between the first feeding point 21b and the grounding point 21a transmits the first non-near field communication excitation current, the first non-near field communication signal can be radiated to the outside, thereby realizing the first non-near field communication function of the electronic device 100. Therefore, the portion between the first feeding point 21b and the grounding point 21a can be used as a first non-near field communication antenna to realize the first non-near field communication function of the electronic device 100.

[0061] In some embodiments, Figure 2 As shown, the second feeding point 21c and the first feeding point 21b are located on the same side of the grounding point 21a. The distance between the second feeding point 21c and the grounding point 21a is greater than the distance between the first feeding point 21b and the grounding point 21a.

[0062] Among them, it should be noted that the frequency of NFC signals is usually 13.56MHz, the frequency of cellular communication signals is usually above 700MHz, the frequency of Wi-Fi signals is usually 2.4GHz or 5GHz, the frequency of GPS signals usually includes multiple frequency bands such as 1.575GHz, 1.227GHz, 1.381GHz, 1.841GHz, and the frequency of BT signals is usually 2.4GHz. Therefore, relative to cellular communication signals, Wi-Fi signals, GPS signals, and BT signals, NFC signals are low-frequency signals, while cellular communication signals, Wi-Fi signals, GPS signals, and BT signals are all high-frequency signals. Or it can also be understood that the NFC signal is a low-frequency signal, and the first non-near field communication signal is a high-frequency signal.

[0063] In addition, according to the quarter-wavelength resonance principle, when transmitting wireless signals, the lower the frequency of the wireless signal, the longer the effective radiation length required by the antenna; and the higher the frequency of the wireless signal, the shorter the effective radiation length required by the antenna. Therefore, when the distance between the second feeding point 21c and the grounding point 21a is set to be greater 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.

[0064] In some embodiments, reference Figure 4 , Figure 4 This is a schematic diagram of the second structure of the antenna device 200 provided in an embodiment of the present application.

[0065] Among them, the second feeding point 21c coincides with the first feeding point 21b. That is, the NFC chip 22 and the first non-near field communication chip 23 share the feeding point 21b (or 21c). For example, when the first non-near field communication chip 23 is a low-frequency cellular communication chip, that is, when the part 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 is relatively long, the low-frequency cellular antenna can be reused as an NFC antenna. Thereby, the number of feeding points on the radiator 21 can be reduced, so the design of the radiator 21 can be simplified.

[0066] In the antenna device 200 provided in the embodiment of the present application, the portion between the two ends of the radiator 21 electrically connected to the first differential signal end 221 and the second differential signal end 222 can be used as an NFC antenna, for example, the portion between the second feeding point 21c and the third feeding point 21d can be used as an NFC antenna, and the portion between the first feeding point 21b and the grounding point 21a can be used as a first non-near field communication antenna, so that the portion between the first feeding point 21b and the grounding point 21a can be reused, that is, the first non-near field communication antenna can be reused, thereby simplifying the design of the NFC antenna.

[0067] refer to Figure 5 , Figure 5 for Figure 2 A schematic diagram of current transmission in the antenna device 200 is shown.

[0068] Among them, the differential excitation current provided by the NFC chip 22 can be output to one end of the radiator 21 via a differential signal end (for example, the first differential signal end 221), for example, output to the end where the first part 211 is located, and then transmitted from the first part 211 to the other end, for example, transmitted to the end where the second part 212 is located, and finally flow back from the second part 212 to the NFC chip 22 via another differential signal end (for example, the second differential signal end 222) to realize the transmission of the differential excitation current.

[0069] The first non-near field communication excitation current provided by the first non-near field communication chip 23 is output to the radiator 21 via the first feeding point 21 b, transmitted to the grounding point 21 a, and finally flows back to the ground to achieve the transmission of the first non-near field communication excitation current.

[0070] 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 directly crosses the grounding point 21a and is transmitted to the other end of the radiator 21, for example, the current I1 is directly transmitted from the end where the second feeding point 21c is located across the grounding point 21a to the end where the third feeding point 21d is located; another part of the current flows back to the ground through the grounding point 21a, for example, the current I2 flows back to the ground through the grounding point 21a; among the currents flowing back to the ground, a part of the current flows back to the radiator 21 through the grounding point 21a and continues to be transmitted to the NFC chip 22, for example, a part of the current I3 flows back to the radiator 21 through the grounding point 21a and continues to be transmitted. Among them, the current I1 can be recorded as the first current, the current I2 can be recorded as the second current, and the current I3 can be recorded as the third current.

[0071] Among them, the current I1 accounts for most of the differential excitation current, the sum of the current I1 and the current I2 is the differential excitation current output by the NFC chip 22, and the sum of the current I1 and the current I3 is the differential excitation current that eventually flows back to the NFC chip 22, wherein the current I3 is less than the current I2. That is, the differential excitation current output by the NFC chip 22 is I1 and I2, and the differential excitation current that eventually flows back to the NFC chip 22 is I1 and I3. Therefore, the differential excitation current output by the NFC chip 22 will cause partial loss during the transmission process, and the lost current is the difference between I2 and I3. It can be understood that the differential excitation current is lossy, which means that the NFC signal radiated by the radiator 21 to the outside world is lossy.

[0072] In order to reduce the loss of the differential excitation current output by the NFC chip 22 during the transmission process, the grounding structure of the radiator 21 may be designed to reduce the current I2 and ultimately reduce the difference between the current I2 and the current I3.

[0073] In some embodiments, reference Figure 6 , Figure 6 This is a third structural schematic diagram of the antenna device 200 provided in an embodiment of the present application.

[0074] The antenna structure 200 also includes a grounding conductor 210. One end of the grounding conductor 210 is connected to the grounding point 21a, and the other end of the grounding conductor 210 is grounded. For example, the electronic device 100 includes a metal middle frame 60, and the metal middle frame 60 can form the system ground of the electronic device 100. Among them, the other end of the grounding conductor 210 can be connected to the metal middle frame 60 to achieve grounding. The grounding conductor 210 can also be understood as a metal rib between the radiator 21 and the metal middle frame 60. It can be understood that the grounding conductor 210 can be integrally formed with the metal middle frame 60, for example, it can be integrally formed by an injection molding process.

[0075] The grounding 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 part of the differential excitation current. The return path can be understood as a path for the current to flow to the system ground, and the return path can be understood as a path for the current to flow back from the system ground to the radiator 21. For example, the grounding conductor 210 can be used to allow the first non-near field communication excitation current to flow to the system ground, to allow the second current I2 in the differential excitation current to flow to the system ground, and to allow the third current I3 in the differential excitation current to flow back from the system ground to the radiator 21.

[0076] It can be understood that the differential excitation current provided by the NFC chip 22 includes the first current I1, the second current I2 and the third current I3. The first current I1 flows through the radiator 21, the second current I2 returns to the ground through the ground conductor 210, and the third current I3 returns to the radiator 21 through the ground conductor 210. The current value of the third current I3 is less than the current value of the second current I2.

[0077] It can be understood 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 the more the NFC performance is attenuated. On the contrary, the smaller the width of the ground conductor 210, the longer the effective current path of the differential excitation current on the radiator, and the smaller the impact on the NFC performance. From another perspective, the larger the width of the ground conductor 210, the larger the second current I2 of the differential excitation current returning to the ground through the ground conductor 210, resulting in more loss, and thus more NFC performance attenuation. On the contrary, the smaller the width of the ground conductor 210, the smaller the second current I2 of the differential excitation current returning to the ground through the ground conductor 210, which can effectively reduce the loss, thereby reducing the impact of the setting of the ground conductor 210 on the NFC performance. It can be understood that the current value of the second current I2 is positively correlated with the width of the ground conductor 210 in the extension direction of the radiator 21. That is, the larger the width of the ground conductor 210 is, the larger the second current I2 is; conversely, the smaller the width of the ground conductor 210 is, the smaller the second current I2 is.

[0078] In some embodiments, Figure 6 As shown, a through slot 210a is provided on the grounding conductor 210. The through slot 210a penetrates the grounding conductor 210. The through slot 210a divides the grounding conductor 210 into a first conductor part 210b and a second conductor part 210c. The sum of the widths of the first conductor part 210b and the second conductor part 210c is smaller than the width of the grounding conductor 210.

[0079] It can be understood that the through slot 210a divides the grounding conductor 210 into a first conductor part 210b and a second conductor part 210c, that is, the grounding conductor 210 is set to be hollowed out by the through slot 210a. Therefore, the sum of the widths of the first conductor part 210b and the second conductor part 210c formed after the grounding conductor 210 is hollowed out is smaller than the width of the grounding conductor 210. In some embodiments, the first conductor part 210b and the second conductor part 210c have the same width. That is, the width of the first conductor part 210b is equal to the width of the second conductor part 210c.

[0080] The first conductor 210b is used to provide a return path for the first non-near field communication excitation current and a return path for part of the differential excitation current. For example, the first conductor 210b is used to provide a return path for the first non-near field communication excitation current and a return path for the second current I2. The second conductor 210c is used to provide a return path for part of the differential excitation current. For example, the second conductor 210c is used to provide a return path for the third current I3.

[0081] It can be understood that after the through groove 210a divides the grounding conductor 210 into the first conductor part 210b and the second conductor part 210c, since the first conductor part 210b is used to provide a ground return path for the second current I2, the current value of the second current I2 is positively correlated with the width of the first conductor part 210b.

[0082] 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, compared with the case where the through slot 210a is not provided, the width of the return path of the second current I2 is reduced, so the second current I2 can be reduced. It should be noted that when the second current I2 is reduced, the third current I3 will also be proportionally reduced, so that the difference between the second current I2 and the third current I3 can be reduced, that is, the loss of the differential excitation current provided by the NFC chip 22 during the transmission process can be reduced, thereby improving the performance of the NFC antenna. In addition, after the through slot 210a is provided on the ground conductor 210, the first conductor 210b formed can ensure that the first non-near field communication excitation current returns to the ground, so it will not affect the transmission of the first non-near field communication excitation current, that is, it will not affect the function of the first non-near field communication antenna. The following is an example of experimental data: In the research on the technical solution of this application, the R&D personnel found that when the through slot 210a is not provided on the conductor structure 210, the measured NFC magnetic field strength is 16.8526A / m; when other conditions remain unchanged and the through slot 210a is provided on the conductor structure 210, the measured NFC magnetic field strength is 18.133A / m. It can be seen that after the through slot 210a is provided on the conductor structure 210, the NFC magnetic field strength can be increased by 7.6%, that is, the performance of the NFC antenna is improved by 7.6%.

[0083] In some embodiments, reference Figure 7 , Figure 7 This is a fourth structural schematic diagram of the antenna device 200 provided in an embodiment of the present application.

[0084] 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 printed circuit 251. For example, the first differential signal terminal 221 can be electrically connected to the second feeding point 21c of the radiator 21 through the first flexible printed circuit 251. Therefore, the first flexible printed circuit 251 can be used to transmit the differential excitation current. It can be understood that when the first flexible printed circuit 251 transmits the differential excitation current, it can also radiate the NFC signal to the outside world, thereby increasing the effective radiation length of the NFC antenna, thereby improving the performance of the NFC antenna.

[0085] In some embodiments, the antenna device 200 further includes a first magnetic field enhancer 253. The material of the first magnetic field enhancer 253 may include an insulating material. For example, the first magnetic field enhancer 253 may include a ferrite layer, and the ferrite layer is formed by a ferrite material, and the ferrite material may be a nickel-copper-zinc system material having a specified content of iron oxide, copper oxide, zinc oxide, and nickel oxide. In addition, the ferrite material may also include some auxiliary materials, such as a specified content of bismuth oxide, silicon oxide, magnesium oxide, cobalt oxide, and the like. The first magnetic field enhancer 253 can be used to enhance the magnetic field strength.

[0086] The first magnetic field enhancer 253 is disposed on one side of the first flexible circuit board 251. For example, the first magnetic field enhancer 253 can 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 can be used to enhance the strength of the magnetic field generated when the first flexible circuit board 251 transmits a differential excitation current, thereby improving the NFC signal strength, and further improving the performance of the NFC antenna.

[0087] In some embodiments, reference Figure 8 , Figure 8 This is a fifth structural schematic diagram of the antenna device 200 provided in an embodiment of the present application.

[0088] The antenna device 200 further includes 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 can be electrically connected to the third feeding point 21d of the radiator 21 through the second flexible circuit board 252. Therefore, the second flexible circuit board 252 can 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, it can also radiate the NFC signal to the outside world, thereby increasing the effective radiation length of the NFC antenna, thereby improving the performance of the NFC antenna.

[0089] In some embodiments, the antenna device 200 further includes a second magnetic field enhancer 254. The material of the second magnetic field enhancer 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.

[0090] The second magnetic field enhancer 254 is disposed on one side of the second flexible circuit board 252. For example, the second magnetic field enhancer 254 can be disposed at the bottom of the second flexible circuit board 252 and abut against the second flexible circuit board 252. The second magnetic field enhancer 254 can be used to enhance the strength of the magnetic field generated when the second flexible circuit board 252 transmits a differential excitation current, thereby improving the NFC signal strength and further improving the performance of the NFC antenna.

[0091] In some embodiments, reference Fig. 9 , Fig. 9 This is a sixth structural schematic diagram of the antenna device 200 provided in an embodiment of the present application.

[0092] The antenna device 200 further includes 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, or the circuit board 26 may be a separate circuit board in the electronic device 100. A first printed circuit 261 and a second printed circuit 262 are arranged on the circuit board 26 at intervals. Both the first printed circuit 261 and the second printed circuit 262 may be used to transmit electrical signals.

[0093] 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 can be electrically connected to the second feeding point 21c of the radiator 21 through the first printed circuit 261. Thus, the first printed circuit 261 can 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.

[0094] 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 can be electrically connected to the third feeding point 21d of the radiator 21 through the second printed circuit 262. Thus, the second printed circuit 262 can 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.

[0095] It should be noted that, in some other embodiments, only one printed circuit may be provided on the circuit board 26, for example, only a first printed circuit 261 or only a second printed circuit 262 may be provided. By transmitting the differential excitation current through the provided first printed circuit 261 or the second printed circuit 262, it is also possible to increase the effective radiation length of the NFC antenna, thereby improving the performance of the NFC antenna.

[0096] In some embodiments, reference Fig.10 , Fig.10 This is a seventh structural schematic diagram of the antenna device 200 provided in an embodiment of the present application.

[0097] The antenna device 200 further includes 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, for implementing corresponding communication functions.

[0098] The second non-near field communication chip 24 may also be disposed on the circuit board 30 of the electronic device 100, or may also be integrated on an independent circuit board in the electronic device 100. The second non-near field communication chip 24 is used to provide a second non-near field communication excitation current.

[0099] The radiator 21 further includes a fourth feeding point 21e. The fourth feeding point 21e and the first feeding point 21b are located on different sides of the grounding point 21a. For example, the first feeding point 21b is located on the first part 211, and the fourth feeding point 21e is located on the second part 212.

[0100] 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 can be electrically connected to the fourth feeding point 21e. Thus, the portion between the fourth feeding point 21e and the grounding point 21a can be used to transmit the second non-near field communication excitation current. It can be understood that when the portion between the fourth feeding point 21e and the grounding point 21a transmits the second non-near field communication excitation current, a second non-near field communication signal can be radiated to the outside, thereby realizing the second non-near field communication function of the electronic device 100. Therefore, the portion between the fourth feeding point 21e and the grounding point 21a can be used as a second non-near field communication antenna to realize the second non-near field communication function of the electronic device 100.

[0101] In some embodiments, Fig.10 As shown, the third feeding point 21d and the fourth feeding point 21e are located on the same side of the grounding point 21a. The distance between the third feeding point 21d and the grounding point 21a is greater than the distance between the fourth feeding point 21e and the grounding point 21a. 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.

[0102] In some embodiments, reference Fig.11 , Fig.11 This is a schematic diagram of the eighth structure of the antenna device 200 provided in an embodiment of the present application.

[0103] Among them, the third feeding point 21d coincides with the fourth feeding point 21e. That is, the NFC chip 22 and the second non-near field communication chip 24 share the feeding point 21d (or 21e). For example, when the second non-near field communication chip 24 is a low-frequency cellular communication chip, that is, when 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 is relatively long, the low-frequency cellular antenna can be reused as an NFC antenna. Thus, the number of feeding points on the radiator 21 can be reduced, so the design of the radiator 21 can be simplified.

[0104] It should be noted that, in actual applications, the second non-near field communication chip 24 and the first non-near field communication chip 23 can be chips of the same type or with the same function, for example, both can be medium- and high-frequency cellular communication chips for realizing medium- and high-frequency cellular communication functions; they can also be chips of different types or with different functions, and the second non-near field communication chip 24 can be, for example, a GPS chip for realizing GPS communication, for example, for realizing communication in the GPS L5 frequency band, and the first non-near field communication chip 23 can be, for example, a medium- and high-frequency cellular communication chip for realizing medium- and high-frequency cellular communication functions.

[0105] It should also 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 can be integrated into one chip, and the integrated chip can simultaneously provide the first non-near field communication excitation current and the second non-near field communication excitation current.

[0106] It is understandable that with the development of communication technology and the advent of the 5G era, more and more antennas need to be installed on electronic devices such as smartphones, and the communication frequency of the antennas is getting higher and higher, such as the gradual transition from 4G communication to 5G communication, so the layout space enjoyed by each antenna is getting smaller and smaller, and the radiation length of each antenna is getting shorter and shorter. In the antenna device 200 provided in the embodiment of the present application, the portion between the first feeding point 21b and the grounding point 21a on the radiator 21 can be used as a first non-near field communication antenna, the portion between the fourth feeding point 21e and the grounding point 21a can be used as a second non-near field communication antenna, and the portion between the first feeding point 21b and the fourth feeding point 21e can be reused as an NFC antenna, so that the NFC antenna can reuse the first non-near field communication antenna and the second non-near field communication antenna at the same time, thereby increasing the radiation length of the NFC antenna and improving the performance of the NFC antenna.

[0107] In addition, since the NFC antenna can reuse the first non-near field communication antenna and the second non-near field communication antenna at the same time, no matter how the position of the grounding point 21a on the radiator 21 is set, that is, no matter how the radiation length of the first non-near field communication antenna changes, no matter how the radiation length of the second non-near field communication antenna changes, the NFC antenna can reuse the first non-near field communication antenna and the second non-near field communication antenna without affecting the radiation length of the NFC antenna. Therefore, it can be ensured that the radiation length of the NFC antenna meets the requirements of the NFC antenna and improve the performance of the NFC antenna.

[0108] In some embodiments, please refer to Fig.12 , Fig.12This is a ninth structural schematic diagram of the antenna device 200 provided in an embodiment of the present application.

[0109] 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 can be understood that the matching circuit can also be called a matching network, a tuning circuit, a tuning network, etc. The filtering circuit can also be called a filtering network.

[0110] The first differential signal terminal 221 and the second differential signal terminal 222 of the NFC chip 22 are electrically connected to the two ends of the radiator 21 through the first matching circuit 271. 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 to match the impedance of the part between the two ends when the differential excitation current is transmitted, for example, to match the impedance of the part between the second feeding point 21c and the third feeding point 21d when the differential excitation current is transmitted.

[0111] The first matching circuit 271 includes a first input terminal 271a, a second input terminal 271b, a first output terminal 271c, and a second output terminal 271d. 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 21d.

[0112] The first filter circuit 281 is disposed between the first differential signal terminal 221 and the first input terminal 271a. The first filter circuit 281 is used to filter out a first interference signal between the first differential signal terminal 221 and the first input terminal 271a. The first interference signal is an electrical signal other than the differential excitation current provided by the NFC chip 22.

[0113] The second filter circuit 282 is disposed between the second differential signal terminal 222 and the second input terminal 271b. The second filter circuit 282 is used to filter out the second interference signal between the second differential signal terminal 222 and the second input terminal 271b. The second interference signal is an electrical signal other than the differential excitation current provided by the NFC chip 22.

[0114] 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 used to match the impedance of the portion between the first feeding point 21b and the grounding point 21a when the first non-near field communication excitation current is transmitted.

[0115] 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 used 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.

[0116] 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 used to match the impedance of the portion between the fourth feeding point 21e and the grounding point 21a when the second non-near field communication excitation current is transmitted.

[0117] 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 used 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.

[0118] It can be understood that the first matching circuit 271, the second matching circuit 272, and the third matching circuit 273 can all include circuits composed of capacitors and inductors connected 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 can also include circuits composed of capacitors and inductors connected in series or in parallel.

[0119] In some embodiments, please refer to Fig.13 , Fig.13 This is a tenth structural schematic diagram of the antenna device provided in an embodiment of the present application.

[0120] The first matching circuit 271 may include, for example, four capacitors C1, C2, C3, and 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 after the series connection, is connected in parallel with the NFC chip 22, and the capacitor C3 and the capacitor C4 are grounded. It can be understood that the capacitance values ​​of the capacitors C1, C2, C3, and C4 can be set according to actual needs.

[0121] The first filter circuit 281 may include, for example, an inductor L1 and a capacitor C5. The inductor L1 is connected in series between the first differential signal terminal 221 and the first matching circuit 271, and the capacitor C5 is connected in parallel with the NFC chip 22 and grounded. It can be understood that the inductance value of the inductor L1 and the capacitance value of the capacitor C5 can be set according to actual needs.

[0122] The second filter circuit 282 may include, for example, an inductor L2 and a capacitor C6. The inductor L2 is connected in series between the second differential signal terminal 222 and the first matching circuit 271, and the capacitor C6 is connected in parallel with the NFC chip 22 and grounded. It can be understood that the inductance value of the inductor L2 and the capacitance value of the capacitor C6 can be set according to actual needs.

[0123] The second matching circuit 272 may include, for example, capacitors C7 and C8. 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 can be understood that the capacitance values ​​of the capacitors C7 and C8 can be set according to actual needs.

[0124] The third filter circuit 283 may include, for example, an inductor L3 and a capacitor C9. 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 can be understood that the inductance value of the inductor L3 and the capacitance value of the capacitor C9 can be set according to actual needs.

[0125] The third matching circuit 273 may include, for example, capacitors C10 and C11. 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 can be understood that the capacitance values ​​of the capacitors C10 and C11 can be set according to actual needs.

[0126] The fourth filter circuit 284 may include, for example, an inductor L4 and a capacitor C12. 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 can be understood that the inductance value of the inductor L4 and the capacitance value of the capacitor C12 can be set according to actual needs.

[0127] In some embodiments, please refer to Fig.14 , Fig.14 A third structural schematic diagram of the electronic device 100 provided in an embodiment of the present application.

[0128] The electronic device 100 further includes a camera module 70. The camera module 70 can be used for taking photos, videos, etc. The camera module 70 can be arranged on a circuit board or a middle frame of the electronic device 100 for fixing.

[0129] 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 in which the differential excitation current provided by the NFC chip 22 is output via a differential signal terminal, flows through the radiator 21, and finally flows back to another 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.

[0130] like Fig.14 As shown, 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.

[0131] The antenna device and electronic device provided in the embodiments of the present application are described in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the present application. At the same time, for those skilled in the art, according to the idea of ​​the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present application.

Claims

1. An antenna device, characterized in that: include: a radiator, the radiator comprising a ground point; a grounding conductor, one end of which is connected to the grounding point and the other end of which is grounded, wherein a through groove is provided on the grounding conductor, and the through groove divides the grounding conductor into a first conductor part and a second conductor part, and the sum of the widths of the first conductor part and the second conductor part is smaller than the width of the grounding conductor; A near field communication chip, comprising 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 to provide a differential excitation current, the first differential signal end and the second differential signal end are electrically connected to two ends of the radiator, respectively, and a portion between the two ends is used to transmit the differential excitation current; The first conductor is used to provide a ground return path for part of the differential excitation current, and the second conductor is used to provide a return path for part of the differential excitation current.

2. The antenna device according to claim 1, characterized in that: The differential excitation current includes a first current flowing through the radiator, a second current returning to the ground through the ground conductor, and a third current returning to the radiator through the ground conductor, wherein a current value of the third current is smaller than a current value of the second current.

3. The antenna device according to claim 2, characterized in that: The first conductor is used to provide a ground return path for the second current, and the second conductor is used to provide a return path for the third current.

4. The antenna device according to claim 3, characterized in that: The current value of the second current is positively correlated with the width of the first conductor.

5. The antenna device according to claim 1, characterized in that: The first conductor and the second conductor have the same width.

6. The antenna device according to any one of claims 1 to 5, characterized in that: The radiator also includes a first feeding point; The antenna device also includes a first non-near field communication chip, which is used to provide a first non-near field communication excitation current. The first non-near field communication chip is electrically connected to the first feeding point, and the part between the first feeding point and the grounding point is used to transmit the first non-near field communication excitation current.

7. The antenna device according to claim 6, characterized in that: The radiator further includes a second feeding point and a third feeding point, wherein the second feeding point and the third feeding point are located 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.

8. The antenna device according to claim 7, characterized in that: The distance between the second feeding point and the grounding point is greater than the distance between the first feeding point and the grounding point.

9. The antenna device according to claim 7, characterized in that: The second feeding point coincides with the first feeding point.

10. The antenna device according to claim 7, characterized in that: The radiator further includes a fourth feeding point, wherein the fourth feeding point and the first feeding point are located on the opposite side of the grounding point; The antenna device also includes a second non-near field communication chip, which is used to provide a second non-near field communication excitation current. The second non-near field communication chip is electrically connected to the fourth feeding point, and the part between the fourth feeding point and the grounding point is used to transmit the second non-near field communication excitation current.

11. The antenna device according to claim 10, characterized in that: 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.

12. The antenna device according to claim 10, characterized in that: The third feeding point coincides with the fourth feeding point.

13. The antenna device according to any one of claims 1 to 5, characterized in that: Also includes: A first flexible circuit board, wherein the first differential signal end is electrically connected to the radiator through the first flexible circuit board, and the first flexible circuit board is used to transmit the differential excitation current.

14. The antenna device according to claim 13, characterized in that: Also includes: The first magnetic field enhancer is arranged on one side of the first flexible circuit board, and is used to enhance the intensity of the magnetic field generated when the first flexible circuit board transmits the differential excitation current.

15. The antenna device according to any one of claims 1 to 5, characterized in that: Also includes: A second flexible circuit board, the second differential signal end is electrically connected to the radiator through the second flexible circuit board, and the second flexible circuit board is used to transmit the differential excitation current.

16. The antenna device according to claim 15, characterized in that: Also includes: The second magnetic field enhancer is arranged on one side of the second flexible circuit board, and is used to enhance the intensity of the magnetic field generated when the second flexible circuit board transmits the differential excitation current.

17. The antenna device according to any one of claims 1 to 5, characterized in that: Also includes: A circuit board, wherein a first printed circuit is arranged on the circuit board; The first differential signal terminal is electrically connected to the radiator through the first printed circuit, and the first printed circuit is used to transmit the differential excitation current.

18. The antenna device according to claim 17, characterized in that: A second printed circuit is also provided on the circuit board, and the second printed circuit is spaced apart 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 used to transmit the differential excitation current.

19. An electronic device, characterized in that: include: An antenna device, wherein the antenna device is the antenna device according to any one of claims 1 to 18; A metal frame, on which metal branches are formed, and the metal branches form the radiator of the antenna device.

20. The electronic device according to claim 19, characterized in that: The metal frame is provided with a first gap and a second gap at intervals, and the metal branch is formed between the first gap and the second gap.

21. The electronic device according to claim 19 or 20, characterized in that: Also includes: The camera module is configured such that the current path of the differential excitation current surrounds the camera module.

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