An electronic device

Abstract

The present application discloses an electronic device, belonging to the technical field of electronic devices. The electronic device includes a metal frame, a metal part, and a first circuit board; the metal frame is provided with a first slit and a second slit, the first slit and the second slit separating the metal frame into a first frame and a second frame; the first frame is provided with at least one feeding point and at least one grounding point, and the second frame is provided with at least one feeding point and at least one grounding point; the metal part is located within the enclosed area of the metal frame and is adjacent to the at least one antenna; the metal part is provided with a metal part grounding point, and the metal part grounding point is electrically connected to the ground portion of the first circuit board through an antenna tuning network.

Description

Technical Field

[0001] The present application belongs to the technical field of electronic equipment, and specifically relates to an electronic equipment. Background Art

[0002] With the development of communication technology, the frequency bands and number of terminal antennas have increased dramatically. On the other hand, the number of rear cameras in terminals has also increased, and the size of camera modules has also increased accordingly, resulting in the enlargement of rear camera metal decorative parts, and ultimately leaving less and less space for antenna layout; as the rear camera metal decorative parts grow larger, they are also getting closer and closer to the antenna body, which leads to an increasing impact of the rear camera metal decorative parts on the antenna radiation performance. How to reduce the impact of metal decorative parts on the antenna is a difficult problem that needs to be solved urgently. Summary of the Invention

[0003] The purpose of the embodiments of the present application is to provide an electronic device that can solve the problem in the related art that metal parts have too great an impact on antenna performance.

[0004] In a first aspect, an embodiment of the present application provides an electronic device, the electronic device comprising:

[0005] A metal frame, a metal part and a first circuit board;

[0006] The metal frame is provided with a first slit and a second slit, the first slit and the second slit separating the metal frame into a first frame and a second frame, the first frame being provided with at least one feeding point and at least one grounding point, and the second frame being provided with at least one feeding point and at least one grounding point;

[0007] The metal part is located in the enclosed area of the metal frame and is adjacent to the at least one antenna. A metal part grounding point is provided on the metal part, and the metal part grounding point is electrically connected to the grounding portion of the first circuit board through an antenna tuning network.

[0008] In an embodiment of the present application, the metal frame of the electronic device is divided into a first frame and a second frame, and at least one feeding point and a grounding point are provided on each of the first frame and the second frame. Since the metal part is located within the enclosed area of the metal frame and is adjacent to at least one antenna, a metal part grounding point is provided on the metal part, and the metal part grounding point is electrically connected to the grounding portion of the first circuit board through an antenna tuning network. The tuning function of the antenna tuning network can be utilized to make the metal part grounding point present different on-off characteristics for the corresponding antenna frequency bands, thereby reducing the performance impact of the metal part on some frequency bands of nearby antennas. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application;

[0010] Figure 2 A schematic diagram of the radiation efficiency of the first antenna provided in an embodiment of the present application in two situations: the presence of a metal component and grounding and the absence of a metal component;

[0011] Figure 3 A schematic diagram illustrating the radiation efficiency of the third antenna provided in an embodiment of the present application in two situations: the presence of a metal component and grounding; and the absence of a metal component.

[0012] Figure 4 A schematic diagram of a connection structure between a grounding point of a metal component and a grounding portion of a first circuit board provided in an embodiment of the present application;

[0013] Figure 5 A schematic diagram of an antenna tuning network provided in an embodiment of the present application;

[0014] Figure 6 Schematic diagram of the S parameters of the third antenna provided in an embodiment of the present application in two cases: the metal part is directly grounded and the metal part is grounded through the antenna tuning network;

[0015] Figure 7 A schematic diagram showing the radiation efficiency of the third antenna provided in an embodiment of the present application when the metal member is directly grounded and when the metal member is grounded through an antenna tuning network;

[0016] Figure 8 A schematic diagram of a gap provided in an embodiment of the present application;

[0017] Figure 9 A schematic diagram of the current flow before and after a gap is formed in a metal part according to an embodiment of the present application;

[0018] Figure 10 A schematic diagram of the radiation efficiency of the third antenna before and after a gap is formed in the metal member provided in an embodiment of the present application;

[0019] Figure 11 A schematic diagram of a connection structure between another grounding point of a metal component and a grounding portion of a first circuit board provided in an embodiment of the present application;

[0020] Figure 12 A schematic diagram of another antenna tuning network provided in an embodiment of the present application. DETAILED DESCRIPTION

[0021] The following will be combined with the accompanying drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of this application.

[0022] The terms "first," "second," and the like in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of this application can be implemented in an order other than that illustrated or described herein, and that the objects distinguished by "first," "second," and the like are generally of the same type, and do not limit the number of objects; for example, the first object can be one or more. In addition, the term "and / or" in the specification and claims refers to at least one of the connected objects, and the character " / " generally indicates that the objects connected are in an "or" relationship.

[0023] The electronic device provided in the embodiments of the present application is described in detail below through specific embodiments and their application scenarios in conjunction with the accompanying drawings.

[0024] An embodiment of the present application provides an electronic device, which includes a metal frame, a metal part and a first circuit board: wherein the metal frame can be a closed ring, and a first slit and a second slit are provided on the metal frame, and the first slit and the second slit separate the metal frame into two independent parts, namely the first frame and the second frame, that is, the first frame and the second frame are discontinuous, and at least one feeding point and at least one grounding point are provided on the first frame, and at least one feeding point and at least one grounding point are also provided on the second frame, then at least part of the first frame serves as the radiating arm of the corresponding antenna, and similarly, the second frame is provided with a first slit and a second slit. A small part serves as the radiation arm of the corresponding antenna; the metal part is located in the enclosed area of the metal frame, and the metal part is adjacent to the first frame and the second frame, that is, the distance between the two is relatively close, with a certain gap, and the first frame and the second frame can be coupled through the broken gap; in order to reduce the impact of the metal part on the nearby antenna, a metal part grounding point is provided on the metal part, and the metal part grounding point is electrically connected to the grounding part provided on the first circuit board through the antenna tuning network. Thus, the tuning function of the antenna tuning network is utilized to make the metal part grounding point present different on-off characteristics for the corresponding antenna frequency band, thereby reducing the performance impact of the metal part on some frequency bands of the nearby antenna.

[0025] In the embodiment of the present application, optionally, the metal frame may be a structure such as a metal frame of an electronic device.

[0026] In the embodiment of the present application, optionally, the first slit and the second slit can be provided on the same frame of the metal frame, or can be provided on two frames of the metal frame respectively.

[0027] In the embodiment of the present application, the antenna tuning network can perform impedance matching and then achieve different impedance characteristics.

[0028] In an embodiment of the present application, the metal frame of the electronic device is divided into a first frame and a second frame, and at least one feeding point and a grounding point are provided on each of the first frame and the second frame. Since the metal part is located within the enclosed area of the metal frame and is adjacent to at least one antenna, a metal part grounding point is provided on the metal part, and the metal part grounding point is electrically connected to the grounding portion of the first circuit board through an antenna tuning network. The tuning function of the antenna tuning network can be utilized to make the metal part grounding point present different on-off characteristics for the corresponding antenna frequency bands, thereby reducing the performance impact of the metal part on some frequency bands of nearby antennas.

[0029] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. Figure 1 As shown, in some embodiments of the present application, the electronic device includes a metal frame, a metal member 5, and a first circuit board 7, wherein the metal frame is provided with a first slit 1 and a second slit 2, which separate the metal frame into a first frame 3 and a second frame 4, and the metal member 5 is located within the enclosed area of the metal frame. The first frame 3 is provided with a first feeding point E and a first grounding point F of the first antenna. Figure 1 The arrow pointing to the first feeding point E represents the feeding signal input of the first antenna. At least part of the first frame 3 serves as the antenna radiating arm of the first antenna. The first frame 3 is also provided with a second feeding point D and a second grounding point G of the second antenna. Figure 1 The arrow pointing to the second feeding point D represents the feeding signal input of the second antenna. At least part of the first frame 3 also serves as the antenna radiation arm of the second antenna, and the second frame 4 is provided with a third feeding point B and a third grounding point A of the third antenna. Figure 1 The arrow pointing to the third feeding point B represents the feeding signal input of the third antenna. At least part of the second frame 4 also serves as the antenna radiation arm of the third antenna. Optionally, the third antenna can also use at least part of the first frame as a parasitic radiation arm.

[0030] In some embodiments of the present application, the first grounding point F may optionally be grounded via a sixth capacitor C6, and the second grounding point G and the third grounding point A may be directly grounded. The second feeding point D and the second grounding point G are respectively located at opposite ends of the first frame 3 in the longitudinal direction, while the first feeding point E and the first grounding point F are located between the second feeding point D and the second grounding point G. The third feeding point B is located at one end of the second frame 4 near the first slit 1.

[0031] In some embodiments of the present application, the length DE between the second feeding point D and the first feeding point E is 13mm~15mm, the length DF between the second feeding point D and the first grounding point F is 30mm~33mm, the length DG between the second feeding point D and the second grounding point G is 43mm~46mm, the length AC between the third grounding point A and the end point of the second frame 4 close to the first break 1 is 14mm~15mm, and the length BC between the third feeding point B and the end point of the second frame 4 close to the first break 1 is 3mm~4mm.

[0032] In some embodiments of the present application, the sixth capacitor C6 has a size of 10 pF, the feed path of the first antenna may be connected in series with a capacitor to isolate the second antenna, and the feed path of the second antenna may be connected in series with an inductor to isolate the first antenna.

[0033] In some embodiments of the present application, among the first antenna, the second antenna, and the third antenna, one is a GPS antenna whose operating frequency band supports the GPS L1 and GPS L5 bands, one is an NFC antenna whose operating frequency band supports the frequency band corresponding to NFC, and the remaining one is a WiFi antenna whose operating frequency band supports the WiFi 2.4G and WiFi 5G bands. Specifically, the first antenna may be a GPS antenna, the second antenna may be an NFC antenna, and the third antenna may be a WiFi antenna. Of course, it can be understood that the antenna types in the embodiments of the present application are not limited to the above types, and may also be antennas that support 4G and 5G operating frequency bands, which will not be repeated here.

[0034] In some embodiments of the present application, the metal member 5 is made of aluminum alloy or the like, and the distance L1 between the outer shape of the metal member 5 and the first frame 3 of the metal frame is 4 mm to 6 mm, while the distance L2 between the outer shape of the metal member 5 and the second frame 4 of the metal frame is 2.2 mm to 3.3 mm. This indicates that the metal member 5 is relatively close to the metal frame, that is, the metal member 5 is relatively close to the antenna. Optionally, the metal member 5 is rectangular.

[0035] In other embodiments of the present application, the electronic device also includes a camera module 6, and a corresponding mounting hole 16 is opened on the metal part 5, and the camera module 6 is arranged in the mounting hole 16, wherein the camera module 6 is a rear camera module 6, that is, the metal part 5 is a metal device part of the rear camera.

[0036] Please refer to Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of the radiation efficiency of the first antenna provided in an embodiment of the present application in two situations: the presence of a metal component and grounding and the absence of a metal component. Figure 3 Schematic diagram of the radiation efficiency of the third antenna provided in an embodiment of the present application in two situations: the presence of a metal component and grounded and the absence of a metal component. Figure 2The dashed line represents the radiation efficiency of the first antenna when the metal component 5 is not present, and the solid line represents the radiation efficiency of the first antenna when the metal component 5 is present and grounded. It can be seen that the addition of the metal component 5 and its grounding have a relatively small impact on the L1 / L5 frequency band of the first antenna, approximately 0.3 dB. Figure 3 The dashed line is the radiation efficiency of the third antenna when there is no metal part 5, and the solid line is the radiation efficiency of the third antenna when there is a metal part 5 and it is grounded. Figure 3 It can be seen that after adding metal component 5 and grounding it, the impact on the third antenna's WiFi 2.4G band is approximately 0.5dB, while the impact on WiFi 5.1G is a maximum of 0.9dB, and the impact on WiFi 5.8G is a maximum of 1.3dB. Overall, adding metal component 5 and grounding it has a greater impact on the performance of the third antenna. If the second antenna is an NFC antenna, its impact can be ignored due to its lower operating frequency. The above grounding method is direct grounding, without grounding through the antenna tuning network 11.

[0037] In the related art, traditional optimization solutions for antennas mounted on metal frames are based on the antenna itself, optimizing size and clearance. However, when the antenna solution is fixed, the overall layout and stacking constraints limit the antenna's inherent optimization space. However, in the present embodiment, considering the surrounding environment that affects antenna performance, the grounding of metal component 5 is modified, grounding the metal component 5 through antenna tuning network 11. The tuning function of antenna tuning network 11 is utilized to make the metal component's grounding point exhibit different on-off characteristics for corresponding antenna frequency bands, thereby reducing the impact of metal component 5 on the performance of nearby antennas in certain frequency bands.

[0038] In the embodiment of the present application, the metal member 5 has at least one metal grounding point, at least one of which is connected to the ground portion 72 of the first circuit board 7 via the antenna tuning network 11. In other words, a metal grounding point can be flexibly provided adjacent to the metal member 5 based on the number and location of antennas to be improved, and grounded via the antenna tuning network 11. This metal grounding point can be tuned to improve antenna performance through the tuning function of the antenna tuning network 11. Optionally, one metal grounding point is connected to one antenna tuning network 11.

[0039] In some embodiments of the present application, optionally, the number of metal component grounding points is four, one of which is electrically connected to the ground portion 72 of the first circuit board 7 via the antenna tuning network 11, while the other three metal component grounding points are directly electrically connected to the ground portion 72 of the first circuit board 7. Analysis has shown that the metal component grounding point close to the antenna has a more critical impact on antenna performance. Therefore, optionally, the metal component grounding point connected to the antenna tuning network 11 is located in an area on the metal component 5 close to the first antenna and / or the third antenna. Specifically, the metal component grounding point connected to the antenna tuning network 11 is set near the first slit 1, or in other words, the distance between the metal component grounding point connected to the antenna tuning network 11 and the first slit 1 is less than a preset threshold to ensure that it can reduce the impact of the metal component 5. That is to say, the grounding point of the metal part connected to the antenna tuning network 11 is generally close to the first break 1. This solution generally has a better improvement effect on high frequencies than on low frequencies. Because high frequencies have strong directionality, under specific conditions, such as near the first break 1, by changing the grounding state, the coupling between the antenna radiation field and the metal part 5 in certain frequency bands is changed (manifested as performance absorption). The frequency band of the first antenna is L1+L5, which is farther away from the metal frame. After the metal part 5 is directly grounded, the overall impact is small (about 0.3dB), and the energy coupling and absorption are also small. Changing the grounding state at a certain point on the metal part 5 usually has a certain effect.

[0040] like Figure 1 As shown, the metal part grounding points include a first metal part grounding point G1, a second metal part grounding point G2, a third metal part grounding point G3 and a fourth metal part grounding point G4. The metal part grounding point connected to the antenna tuning network 11 is the first metal part grounding point G1, and the first metal part grounding point G1 is arranged close to the first break 1.

[0041] Please refer to Figure 4 , Figure 4 This is a schematic diagram of the connection structure between a metal grounding point and a grounding portion of a first circuit board provided in an embodiment of the present application. Figure 4As shown, in the embodiment of the present application, the first circuit board 7 is located below the metal component 5. A first antenna clearance area 70 is provided on the first circuit board 7. A grounding spring 10 is provided on the first antenna clearance area 70. The metal component grounding point is electrically connected to the grounding spring 10, and the grounding spring 10 is electrically connected to the first end 110 of the antenna tuning network 11. The second end 111 of the antenna tuning network 11 is electrically connected to the ground portion 72 of the first circuit board 7. The specific connection between the metal component grounding point and the grounding spring 10 is as follows: the metal component grounding point is connected to the steel sheet 9 via a locking screw 8, and the steel sheet 9 is further connected to the grounding spring 10. Optionally, a second antenna clearance area 71 is also provided on the first circuit board 7. The first and second antenna clearance areas 70, 71 do not need to be entirely copper-clad; materials such as FR4 can be used. The grounding portion 72 on the first circuit board 7 is formed by the copper-clad area.

[0042] In some embodiments of the present application, the electronic device further includes a second circuit board 101 , and the grounding portion 72 of the first circuit board 7 is electrically connected to the grounding portion 72 of the second circuit board 101 via a connector 12 .

[0043] In some embodiments of the present application, the antenna tuning network 11 is an LC circuit, that is, a tuning circuit composed of a capacitor and an inductor.

[0044] Please refer to Figure 5 , Figure 5 This is a schematic diagram of an antenna tuning network provided in an embodiment of the present application. Figure 5 As shown, the antenna tuning network 11 in the embodiment of the present application is an LC circuit, which includes a first inductor L1, a first capacitor C1, and a second capacitor C2, wherein the first inductor L1 and the first capacitor C1 are connected in series and then in parallel with the second capacitor C2. Specifically, the first end 110 of the antenna tuning network 11 is respectively connected to the first end of the first inductor L1 and the first end of the second capacitor C2, the second end of the first inductor L1 is connected to the first end of the first capacitor C1, and the second end 111 of the antenna tuning network 11 is respectively connected to the second end of the first capacitor C1 and the second end of the second capacitor C2. One of the first end 110 and the second end of the antenna tuning network 11 is connected to the grounding spring 10, and the other end is connected to the grounding portion 72 of the first circuit board 7.

[0045] In some embodiments of the present application, optionally, the size of the first inductor L1 is 2nH to 3nH, the size of the first capacitor C1 is 3.9pF to 4.7pF, and the size of the second capacitor C2 is 2.4pF to 3pF.

[0046] Please refer to Figure 6 and Figure 7 , Figure 6Schematic diagram of the S parameters of the third antenna provided in an embodiment of the present application in two cases: the metal part is directly grounded and the grounding is performed through the antenna tuning network. Figure 7 Schematic diagram of the radiation efficiency of the third antenna provided in an embodiment of the present application under two conditions: the metal part is directly grounded and the metal part is grounded through the antenna tuning network. Figure 6 The dotted line in FIG is the S parameter curve of the third antenna when the metal member 5 is directly grounded, and the solid line is the S parameter curve of the third antenna when the metal member 5 is grounded through the antenna tuning network 11; Figure 7 The dotted line in FIG is the radiation efficiency curve of the third antenna when the metal member 5 is directly grounded, and the solid line is the radiation efficiency curve of the third antenna when the metal member 5 is grounded through the antenna tuning network 11 .

[0047] The following combination Figure 6 and Figure 7 The working principle of the antenna tuning network 11 is introduced.

[0048] In the embodiment of the present application, the antenna tuning network 11 presents a large capacitance to the L1 / L5 frequency band of the first antenna, which is approximately a short circuit. At this time, the impact on the first antenna is very small. At this time, compared with the solution of directly grounding the metal grounding point, the efficiency of the first antenna under the two solutions is almost the same; while the antenna tuning network 11 presents a large inductance to the WiFi 2.4G of the third antenna, which is approximately an open circuit, and also presents a small capacitance of 2pF to 3pF to the WiFi 5G of the third antenna. At this time, compared with the solution of directly grounding the metal grounding point, the S parameter of the third antenna is not much different, but the solution of grounding the antenna tuning network 11 increases the average efficiency of the WiFi 2.4G of the third antenna by about 0.5dB, widens the bandwidth, and increases the efficiency of WiFi 5.15~5.55G by about 0.6dB. Therefore, in the embodiment of the present application, a metal part grounding point is set on the metal part 5 in an area close to the antenna, and the metal part grounding point is grounded through the antenna tuning network 11, so that it presents different capacitance or inductance characteristics for different frequency bands of different antennas, thereby reducing the influence of the metal part 5 on the surrounding specific antenna frequency bands, thereby achieving the purpose of optimizing the antenna performance.

[0049] In some embodiments of the present application, a slot 13 is provided in the area of the metal member 5 adjacent to the third antenna. Specifically, a slot 13 is provided in the area of the metal member 5 adjacent to the third grounding point A of the second frame 4 and the first slit 1, as well as the first frame 3. The shape of the slot 13 corresponds to the shape formed by the area of the second frame 4 from the third grounding point A to the first slit 1 and the second frame 4. In other words, a slot 13 is provided in the area of the metal member 5 adjacent to the third antenna, extending through the plane of the metal member 5, and the cross-sectional shape of the slot 13 is determined by the shape of the third antenna. Optionally, if the third antenna is an L-shaped antenna, i.e., comprising a radiating arm AC segment and a parasitic radiating arm DG segment, which together form an L-shape, the slot 13 can be shaped accordingly. Optionally, the slot 13 is filled with an insulating medium, such as a plastic, while the outer surface of the metal member 5 is covered with decorative glass or ceramic.

[0050] Please refer to Figure 8 , Figure 8 Schematic diagram of the gap provided in the embodiment of the present application. Figure 8 As shown, in the embodiment of the present application, optionally, the shape of the gap 13 can be L-shaped, and the L-shape includes two sections, a narrow part and a wide part, the width W1 of the narrow part is 1mm~1.5mm, and the length is 9~11mm, and the width W2 of the wide part is 2mm~2.5mm, and the length is 9mm~11mm.

[0051] Please refer to Figure 9 , Figure 9 Schematic diagram of current flow before and after the metal part 5 is provided with the gap 13 in the embodiment of the present application. Figure 9 As shown, the inventors have found through research and analysis that the WiFi 5.15~5.55G frequency band of the third antenna is located in the area close to the antenna on the metal part 5 (i.e. Figure 9 The portion (enclosed by the dashed line) has strong electric field coupling, causing some of the antenna's radiated energy to be trapped there, resulting in lower radiation efficiency in the corresponding frequency band of the third antenna. In this embodiment of the present application, by providing gaps 13 in the metal member 5 in areas where strong electric field coupling occurs in certain frequency bands of the antenna, the current and electric field distribution in these areas can be changed. Figure 9 In the figure, the dotted arrow represents the direction of the current. Taking the resonant frequency of 5.25 GHz as an example, before the gap 13 is opened, there are reverse currents at the first position E1 and the second position E2 on the metal part 5, that is, there are two large electric field couplings; after the gap 13 is opened, there is a reverse current only at the third position E3, that is, there is only one large electric field coupling point, that is, after the gap 13 is opened, the electric field coupling between the third antenna and the metal part 5 in this frequency band will be weakened accordingly, thereby reducing the influence of the metal part 5 on the performance of the antenna in a specific frequency band.

[0052] Please refer to Figure 10 , Figure 10 Schematic diagram of the radiation efficiency of the third antenna before and after the metal part is provided with a gap in the embodiment of the present application. Figure 10 As shown in the comparative radiation efficiency curves, it can be seen that after the gap 13 is opened, the radiation efficiency of the third antenna in the WiFi 5.15~5.55G frequency band can be improved by an average of 0.5dB.

[0053] In some embodiments of the present application, the shape of the slot 13 may optionally be determined based on the shape of the antenna that has the strongest coupling effect on the metal member 5 among all the antennas. For example, if the third antenna is composed of L-shaped branches, the shape of the slot 13 may be set to correspond to the third antenna, i.e., to be L-shaped.

[0054] In some other embodiments of the present application, the antenna tuning network 11 is an antenna tuner.

[0055] Please refer to Figure 11 and Figure 12 , Figure 11 This is a schematic diagram of the connection structure between another metal grounding point and the grounding portion of the first circuit board provided in an embodiment of the present application. Figure 12 A schematic diagram of another antenna tuning network provided in an embodiment of the present application. Figure 11 The connection method between the metal grounding point in the first circuit board 7 and the grounding portion 72 is the same as Figure 4 Compared with the connection method in , only the structure of the antenna tuning network 11 is different. For details, please refer to the above introduction and will not be repeated here.

[0056] like Figure 12As shown, the antenna tuning network 11 includes a switching switch 112, a second inductor L2, a third inductor L3, a fourth inductor L4, a third capacitor C3, a fourth capacitor C4 and a fifth capacitor C5, wherein a first end 110 of the antenna tuning network 11 is electrically connected to the first end of the second inductor L2, the first end of the third inductor L3, the first end of the fourth inductor L4, the first end of the fourth capacitor C4 and the first end of the fifth capacitor C5 respectively through the switching switch 112, the second end of the second inductor L2 is connected to the first end of the third capacitor C3, and the second end 111 of the antenna tuning network 11 is connected to the second end of the third capacitor C3, the second end of the third inductor L3, the second end of the fourth inductor L4, the second end of the fourth capacitor C4 and the second end of the fifth capacitor C5 respectively. In the embodiment of the present application, the antenna tuning network 11 can be switched to a different LC circuit, an L circuit, a C circuit, or a parallel combination of the aforementioned circuits by switching the switch 112. This allows for flexible adjustment of the ground state of the metal grounding point on the metal member 5. This not only optimizes the performance of a specific antenna frequency band, but also tunes the clutter generated by the metal member 5. That is, when the antenna operates in a specific frequency band, by switching the switch 112, different capacitance or inductance characteristics are constructed, and clutter is moved out of the interfering antenna frequency band, thereby optimizing the performance of a portion of the antenna frequency band. Furthermore, because the impedance matching adjustment range is larger, the antennas that can improve performance are not limited to the GPS frequency band, the NFC operating frequency band, the WiFi frequency band, and the like. Improvements can also be achieved in frequency bands such as MHB, N78, and N79.

[0057] In an embodiment of the present application, a metal frame of an electronic device is divided into a first frame and a second frame, and at least one feeding point and a grounding point are provided on each of the first frame and the second frame. Since the metal part is located within the enclosed area of the metal frame and is adjacent to at least one antenna, a metal part grounding point is provided on the metal part, and the metal part grounding point is electrically connected to the ground portion of the first circuit board through an antenna tuning network. The tuning function of the antenna tuning network can be utilized to make the metal part grounding point present different on-off characteristics for the corresponding antenna frequency band, thereby reducing the impact of the metal part on the performance of some frequency bands of nearby antennas; and, by opening holes at appropriate positions on the metal part to change the distribution of current and electric field in some areas close to the antenna, the impact of the metal part body on specific frequency bands of the antenna can also be reduced, thereby achieving improved antenna performance.

[0058] The electronic device in the embodiments of the present application may be a terminal or other device other than a terminal. For example, the electronic device may be a mobile phone, a tablet computer, a laptop computer, a PDA, an in-vehicle electronic device, a mobile internet device (MID), an augmented reality (AR) / virtual reality (VR) device, a robot, a wearable device, an ultra-mobile personal computer (UMPC), a netbook, or a personal digital assistant (PDA), etc. It may also be a personal computer (PC), a television (TV), an ATM, or an kiosks, etc., and the embodiments of the present application do not specifically limit the above.

[0059] It should be noted that, in this article, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element. In addition, it should be noted that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in the opposite order according to the functions involved. For example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0060] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this application, ordinary technicians in this field can also make many forms without departing from the purpose of this application and the scope of protection of the claims, all of which are within the protection of this application.

Claims

1. An electronic device, characterized in that: It includes a metal frame, a metal part and a first circuit board; The metal frame is provided with a first slit and a second slit, the first slit and the second slit separating the metal frame into a first frame and a second frame, the first frame being provided with at least one feeding point and at least one grounding point, and the second frame being provided with at least one feeding point and at least one grounding point; The metal part is located in the enclosed area of the metal frame and is adjacent to the first frame and the second frame. A metal part grounding point is provided on the metal part, and the metal part grounding point is electrically connected to the grounding portion of the first circuit board through an antenna tuning network.

2. The electronic device according to claim 1, wherein The first frame is provided with a first feeding point and a first grounding point of the first antenna, the first frame is also provided with a second feeding point and a second grounding point of the second antenna, and the second frame is provided with a third feeding point and a third grounding point of the third antenna.

3. The electronic device according to claim 2, wherein: The first grounding point is grounded through a sixth capacitor, the second feeding point and the second grounding point are respectively located at the two ends of the first frame in the length direction, the first feeding point and the first grounding point are located between the second feeding point and the second grounding point, and the third feeding point is located at one end of the second frame close to the first break.

4. The electronic device according to claim 3, wherein: A gap is provided on the metal member in an area adjacent to the third antenna, and a shape of the gap corresponds to a shape formed by a combination of a portion from the third grounding point to the first break on the second frame and the first frame.

5. The electronic device according to claim 4, characterized in that The shape of the gap is L-shaped.

6. The electronic device according to claim 4, characterized in that The gap is filled with an insulating medium.

7. The electronic device according to claim 1, wherein: An antenna clearance area is provided on the first circuit board, a grounding spring is provided on the antenna clearance area, the metal part grounding point is electrically connected to the grounding spring, the grounding spring is electrically connected to the first end of the antenna tuning network, and the second end of the antenna tuning network is electrically connected to the grounding portion of the first circuit board.

8. The electronic device according to claim 1, wherein: The antenna tuning network is an LC circuit, which includes a first inductor, a first capacitor, and a second capacitor. The first inductor and the first capacitor are connected in series and then in parallel with the second capacitor.

9. The electronic device according to claim 1, wherein: The antenna tuning network includes a switching switch, a second inductor, a third inductor, a fourth inductor, a third capacitor, a fourth capacitor and a fifth capacitor. The first end of the antenna tuning network is electrically connected to the first end of the second inductor, the first end of the third inductor, the first end of the fourth inductor, the first end of the fourth capacitor and the first end of the fifth capacitor through the switching switch. The second end of the second inductor is connected to the first end of the third capacitor. The second end of the antenna tuning network is connected to the second end of the third capacitor, the second end of the third inductor, the second end of the fourth inductor, the second end of the fourth capacitor and the second end of the fifth capacitor.

10. The electronic device according to claim 2, wherein: The first antenna is a GPS antenna, the second antenna is an NFC antenna, and the third antenna is a WiFi antenna.

11. The electronic device according to claim 1, wherein The electronic device further includes a camera module. A mounting hole is provided on the metal piece, and the camera module is arranged in the mounting hole.

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