Electronic device

Abstract

The electronic equipment comprises a reference floor and an antenna assembly, the antenna assembly comprises a first radiator and a first feed source which are connected, and the first radiator is used for generating a first excitation current under excitation of the first feed source so as to support transceiving of a radio frequency signal of a first frequency band; the second radiator and the second feed source are connected, and the second radiator is used for generating a second excitation current under the excitation of the second feed source so as to support the transceiving of the radio frequency signal of the first frequency band; the parasitic radiator is used for being coupled with the first radiator and / or the second radiator to generate parasitic current of the first frequency band; wherein the reference floor is used for generating longitudinal current on the reference floor under the action of the first excitation current and the second excitation current and generating transverse current on the reference floor under the excitation of the parasitic current, and the amplitude of the longitudinal current and the amplitude of the transverse current are in the same preset range.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of antenna technology, and in particular, to an electronic device. Background Art

[0002] With the continuous development and evolution of communication technology, the functions of electronic devices are becoming more and more abundant, and users have higher and higher requirements for the communication quality of electronic devices. For example, the stability of communication quality can be improved by improving the circularity of the directional pattern. However, the circularity of the directional pattern of electronic devices in the prior art in some frequency bands cannot meet the user's usage requirements. Summary of the invention

[0003] Based on this, it is necessary to provide an electronic device that can improve the isolation between MIMO antennas in order to solve the above technical problems.

[0004] The present application provides an electronic device, including a reference floor and an antenna assembly, wherein the antenna assembly includes:

[0005] A first radiator and a first feed source connected to each other, wherein the first radiator is used to generate a first excitation current under the excitation of the first feed source to support the transmission and reception of radio frequency signals in a first frequency band;

[0006] A second radiator and a second feed source connected to each other, wherein the second radiator is used to generate a second excitation current under the excitation of the second feed source to support the transmission and reception of radio frequency signals in the first frequency band;

[0007] a parasitic radiator, configured to couple with the first radiator and / or the second radiator to generate a parasitic current in the first frequency band;

[0008] The reference floor is used to generate a longitudinal current on the reference floor under the action of the first excitation current and the second excitation current, and to generate a transverse current on the reference floor under the excitation of the parasitic current, and the amplitudes of the longitudinal current and the transverse current are within the same preset range.

[0009] The above-mentioned electronic device, by setting a first radiator and a second radiator, as well as a first feed connected to the first radiator and a second feed connected to the second radiator, can simultaneously support dual-channel transmission and reception of radio frequency signals in the first frequency band, and stimulate the longitudinal current on the reference floor. The floor current on the reference floor will greatly affect the directional pattern of the electronic device. Therefore, when the longitudinal current is dominant on the reference floor, the roundness of the directional pattern of the first frequency band is difficult to meet the user's usage requirements. The present application introduces a parasitic radiator so that the parasitic radiator generates a parasitic current by coupling, and then stimulates the transverse current on the reference floor through the parasitic current, so that the transverse current and the longitudinal current on the reference floor can be more balanced. In particular, when the amplitudes of the longitudinal current and the transverse current are within the same preset range, the roundness of the directional pattern can be effectively improved, thereby improving the coverage uniformity of the radio frequency signal of the electronic device in the first frequency band, so that the electronic device has similar radiation characteristics in different directions, thereby improving the receiving ability of the mobile phone in all directions, and improving the signal stability of the electronic radio frequency. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the related technical descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0011] Figure 1 is an exploded schematic diagram of an electronic device according to an embodiment;

[0012] Figure 2 is one of the partial schematic diagrams of an electronic device according to an embodiment;

[0013] Figure 3 is a schematic diagram of a parasitic radiator connected to a pressure plate support according to an embodiment;

[0014] Figure 4 The second partial schematic diagram of an electronic device according to an embodiment;

[0015] Figure 5 is a schematic diagram of a tuning circuit according to an embodiment;

[0016] FIG6( a ) is a color diagram of S parameter data of an electronic device according to an embodiment;

[0017] FIG6( b ) is a grayscale diagram of S parameter data of an electronic device according to an embodiment;

[0018] FIG. 7 ( a ) is a color diagram of the directional pattern of the first radiator of an embodiment;

[0019] FIG. 7( b ) is a grayscale diagram of the directional diagram of the first radiator according to an embodiment;

[0020] FIG8( a ) is a color diagram of the directional pattern of the second radiator of an embodiment;

[0021] FIG8( b ) is a grayscale image of the directional diagram of the second radiator of an embodiment;

[0022] FIG9( a ) is a color image of a synthetic directional pattern of an electronic device according to an embodiment of the present application;

[0023] FIG9( b ) is a grayscale image of a synthetic directional image of the electronic device according to an embodiment of the present application;

[0024] FIG. 10 ( a ) is a color diagram showing a comparison of the directional diagrams of the electronic device according to the embodiment of the present application and the related art;

[0025] FIG. 10( b ) is a grayscale image of a comparison diagram of the directional diagrams of the electronic device according to the embodiment of the present application and the related art;

[0026] Fig.11 This is a third partial schematic diagram of an electronic device according to an embodiment.

[0027] Component number description:

[0028] Display screen: 10; middle frame: 20; frame body: 21; border: 22; reference floor: 23; main board: 24; back cover: 30; first radiator: 100; second radiator: 200; parasitic radiator: 300. Specific embodiments

[0029] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0030] It is understood that the terms "first", "second", etc. used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, a first radiator may be referred to as a second radiator, and similarly, a second radiator may be referred to as a first radiator without departing from the scope of this application.

[0031] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. "Multiple" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined. "Several" means at least one, such as one, two, etc., unless otherwise clearly and specifically defined.

[0032] The embodiment of the present application provides an electronic device, which includes an antenna assembly. The electronic device includes, but is not limited to, a mobile phone, a tablet computer, a laptop computer, a computer, a wearable device, a drone, a robot, a digital camera, and other devices with communication functions. The embodiment of the present application takes a mobile phone as an example for explanation, and other electronic devices can refer to this embodiment.

[0033] Figure 1 is an exploded schematic diagram of an electronic device according to an embodiment, referring to Figure 1 The electronic device includes a display screen 10, a middle frame 20 and a back cover 30 which are sequentially arranged along a thickness direction.

[0034] Among them, the middle frame 20 includes a frame body 21 and a frame 22 surrounding the frame body 21. The frame 22 can be a conductive frame 22. Of course, in other embodiments, the electronic device may not have a frame body 21. The display screen 10, the frame body 21 and the back cover 30 are stacked in sequence, and a receiving space is formed between the display screen 10 and the frame body 21, and between the frame body 21 and the back cover 30 to accommodate the main board 24, the camera module, the receiver module, the battery, various sensors and other devices. One side of the frame 22 is surrounded by the edge of the display screen 10, and the other side of the frame 22 is surrounded by the edge of the back cover 30 to form a complete appearance structure of the electronic device. In this embodiment, the frame 22 and the frame body 21 are an integral structure, and the frame 22 and the back cover 30 can be a split structure. The above is the working environment of the antenna assembly taking a mobile phone as an example, but the antenna assembly of the present application is not limited to the above working environment.

[0035] The frame 22 includes a top edge and a bottom edge that are arranged opposite to each other, and a first side edge and a second side edge connected to the top edge and the bottom edge. The top edge is the side away from the ground when the user holds the electronic device and uses it in portrait mode, and the bottom edge is the side facing the ground when the user holds the electronic device and uses it in portrait mode. The first side edge is the left side edge when the user holds the electronic device and uses it in portrait mode. The second side edge is the right side edge when the user holds the electronic device and uses it in portrait mode. Of course, the first side edge can also be the right side edge when the user holds the electronic device and uses it in portrait mode. The second side edge is the left side edge when the user holds the electronic device and uses it in portrait mode.

[0036] The electronic device also includes a reference floor 23. Optionally, the reference floor 23 is disposed in the frame 22. That is, the frame 22 is disposed around the reference floor 23. The reference floor 23 is roughly rectangular in shape. Because devices are set up in the mobile phone as needed or other structures are avoided, various grooves, holes, etc. can be opened on the reference floor 23. The reference floor 23 can be, but is not limited to, the frame body 21 of the middle frame 20 in the electronic device, or the ground in the circuit board, or the shielding part of the display screen 10, or a conductive battery cover, etc. In other embodiments, the reference floor 23 can also be a separate ground independent of the frame body 21 of the electronic device, the ground of the circuit board, the shielding part of the display screen 10, and the conductive battery cover. The present application does not limit the reference floor 23.

[0037] Figure 2 FIG. 1 is a partial schematic diagram of an electronic device according to an embodiment of the present invention. Figure 2 , shows an antenna assembly in an electronic device, the antenna assembly includes a first radiator 100, a second radiator 200 and a parasitic radiator 300.

[0038] Among them, the radiator can be understood as a conductor with a specific size. The material of the radiator includes but is not limited to metal, alloy, graphite, semiconductor, plasma, conductive polymer. The shape of the radiator includes but is not limited to strip, sheet, rod, coating, and film. The extension method of the radiator includes but is not limited to straight extension, curve extension, and bending extension. The above-mentioned main radiator can be a line with uniform width on the extension trajectory, or it can be an irregular shape with different widths such as a gradient width and a widened area. In the schematic diagram of the present embodiment, the first radiator 100 and the second radiator 200 extend along a straight trajectory, and the parasitic radiator 300 is a sheet structure. It can be understood that the shape of each radiator shown in the schematic diagram of the present embodiment should not be understood as a limitation on the embodiment of the present application.

[0039] The radiator may be a built-in antenna or an external antenna. When the radiator is a built-in antenna, the form of the radiator includes but is not limited to a flexible printed circuit board antenna formed on a flexible printed circuit board (FPC), a laser direct structured antenna formed by laser direct structure (LDS), a printed direct structured antenna formed by printing direct structure (PDS), and a conductive sheet antenna (such as a metal bracket antenna). When the radiator is an external antenna, the form of the radiator includes but is not limited to a frame 22 antenna and an antenna disposed on the outer surface of the non-conductive frame 22. In the schematic diagram of the present embodiment, the first radiator 100 and the second radiator 200 may be frame 22 antennas, and the parasitic radiator 300 may be any one of a flexible printed circuit board antenna and a laser branch structured antenna. It is understandable that the types of radiators shown in the schematic diagram of the present embodiment should not be understood as limitations on the embodiments of the present application.

[0040] The first radiator 100 is connected to the first feed source S1, and is used to generate a first excitation current under the excitation of the first feed source S1. The second radiator 200 is connected to the second feed source S2, and is used to generate a second excitation current under the excitation of the second feed source S2.

[0041] The first feed source S1 may include a radio frequency chip. During the signal transmission process, the radio frequency chip converts the baseband signal into a high-frequency feeding signal suitable for wireless transmission, and transmits it to the first radiator 100 through the feeder line. The first radiator 100 transmits the electromagnetic wave signal into space according to the feeding signal. The second feed source S2 may include a radio frequency chip. During the signal transmission process, the radio frequency chip converts the baseband signal into a high-frequency feeding signal suitable for wireless transmission, and transmits it to the second radiator 200 through the feeder line. The second radiator 200 transmits the electromagnetic wave signal into space according to the feeding signal. Among them, the first feed source S1 and the second feed source S2 may include the same radio frequency chip, or may include different radio frequency chips, which is not limited here.

[0042] The first excitation current is used to support the transceiving of RF signals in the first frequency band, and the second excitation current is used to support the transceiving of RF signals in the first frequency band. That is, the first feed source S1 is used to provide a feed signal in the first frequency band to the first radiator 100, and the second feed source S2 is used to provide a feed signal in the first frequency band to the second radiator 200, so that both the first radiator 100 and the second radiator 200 are used to support the transceiving of RF signals in the first frequency band.

[0043] In an exemplary embodiment, the first feed source S1 and the second feed source S2 provide corresponding feed signals to the corresponding radiator in a time-sharing manner. That is, the first feed source S1 provides a first feed signal to the first radiator 100 in a first time period, and the second feed source S2 provides a second feed signal to the second radiator 200 in a second time period, and the first time period and the second time period are different. In another exemplary embodiment, the first feed source S1 and the second feed source S2 provide corresponding feed signals to the corresponding radiator at the same time. That is, the first feed source S1 provides a first feed signal to the first radiator 100 in a first time period, and the second feed source S2 provides a second feed signal to the second radiator 200 in a second time period, and the first time period and the second time period are the same. Moreover, in the case where the first feed source S1 and the second feed source S2 provide corresponding feed signals to the corresponding radiator at the same time, the first radiator 100 and the second radiator 200 can choose to support any one of MIMO reception and main diversity reception for the first frequency band. This embodiment does not limit the working time periods of the first feed source S1 and the second feed source S2, and can be flexibly set according to needs.

[0044] The parasitic radiator 300 is used to couple with the first radiator 100 and / or the second radiator 200 to generate a parasitic current in the first frequency band. That is, the parasitic radiator 300 can be coupled with the first radiator 100 to generate a parasitic current in the first frequency band, or the parasitic radiator 300 can be coupled with the second radiator 200 to generate a parasitic current in the first frequency band, and the parasitic radiator 300 can be coupled with the first radiator 100 and the second radiator 200 at the same time to generate a parasitic current in the first frequency band. Specifically, the radiator to which the parasitic radiator 300 is coupled can be determined by adjusting the relative position and distance between the first radiator 100, the second radiator 200 and the parasitic radiator 300.

[0045] Among them, taking the coupling of the parasitic radiator 300 and the second radiator 200 as an example, coupling means that an electric field is generated between the second radiator 200 and the parasitic radiator 300, and the electrical signal on the second radiator 200 can be transmitted to the parasitic radiator 300 through the electric field, so that the second radiator 200 and the parasitic radiator 300 can achieve electrical signal conduction even when they are not in direct contact or not directly connected.

[0046] Based on the principle of current balance, the current generated on the reference floor 23 is the reverse current of the current on the branch. Therefore, the reference floor 23 is used to generate a longitudinal current on the reference floor 23 under the action of the first excitation current and the second excitation current. Moreover, based on the direction of the parasitic current on the parasitic radiator 300, a transverse current on the reference floor 23 can be generated under the excitation of the parasitic current. In addition, the transverse current generated on the reference floor 23 will further pull the first excitation current on the first radiator 100 and the second excitation current on the second radiator 200, thereby changing the radiation direction characteristics of the first radiator 100 and the second radiator 200 themselves.

[0047] Since the floor current on the reference floor 23 will greatly affect the directional pattern of the electronic device, when the longitudinal current is dominant on the reference floor 23, the roundness of the directional pattern of the first frequency band is difficult to meet the user's usage requirements. The embodiment of the present application introduces a parasitic radiator 300, so that the parasitic radiator 300 generates a parasitic current by coupling, and then stimulates the transverse current on the reference floor 23 through the parasitic current, which can change the current distribution of the whole machine and make the transverse current and the longitudinal current on the reference floor 23 more balanced. In particular, when the amplitudes of the longitudinal current and the transverse current are within the same preset range, the roundness of the directional pattern can be effectively improved, thereby improving the coverage uniformity of the radio frequency signal of the electronic device in the first frequency band, so that the electronic device has similar radiation characteristics in different directions, thereby improving the receiving ability of the mobile phone in all directions and improving the signal stability of the electronic radio frequency.

[0048] In one embodiment, the first frequency band is any one of a low frequency band, a medium frequency band, a high frequency band and an ultra-high frequency band.

[0049] The low-frequency band is the band between 704MHz and 960MHz. The low-frequency band includes but is not limited to the B5 / N5 band (uplink 824MHz to 849MHz; downlink 869MHz to 894MHz), the B8 / N8 band (uplink 880MHz to 915MHz; downlink 925MHz to 960MHz), the B20 / N20 band (uplink 832MHz to 862MHz; downlink 791MHz to 821MHz), and the B28 band (uplink 703MHz to 748MHz; downlink 758MHz to 803MHz).

[0050] The medium frequency band is the frequency band between 1710MHz and 2170MHz. The medium frequency band includes but is not limited to the B1 / N1 band (uplink 1920MHz to 1980MHz; downlink 2110MHz to 2170MHz), the B2 / N2 band (uplink 1850MHz to 1910MHz; downlink 1930MHz to 1990MHz), the B3 / N3 band (uplink 1710MHz to 1785MHz; downlink 1805MHz to 1880MHz), the B4 band (uplink 1710MHz to 1755MHz; downlink 2110MHz to 2155MHz), the B34 / N34 band (2010MHz to 2025MHz), and the B39 / N39 band (1880MHz to 1920MHz).

[0051] The high frequency band is the band between 2MHz and 2690MHz. The high frequency band includes but is not limited to the B40 / N40 band (2MHz to 2MHz), the B41 / N41 band (2469MHz to 2690MHz), the B38 / N38 band (2570MHz to 2620MHz), and the B7 / N7 band (uplink 2MHz to 2570MHz; downlink MHz to 2690MHz).

[0052] The ultra-high frequency band is a frequency band greater than 2690MHz. The ultra-high frequency band includes but is not limited to the N77 band (3.3GHz to 4.2GHz), the N78 band (3.3GHz to 3.8GHz), and the N79 band (4.4GHz to 5.0GHz).

[0053] In one of the embodiments, at least one of the first feed source S1 and the second feed source S2 is also used to provide feed signals of other frequency bands other than the first frequency band to the corresponding radiator, so that the radiator supports the transmission and reception of radio frequency signals of other frequency bands. By multiplexing a radiator to support the transmission and reception of radio frequency signals of multiple frequency bands, the number of radiators in the antenna assembly can be reduced, thereby reducing the space occupied by the antenna assembly in the electronic device. In an exemplary manner, the first feed source S1 is used to provide a first feed signal of the N78 frequency band and a third feed signal of the WIFI 2.4G frequency band. In another exemplary manner, the second feed source S2 is used to provide a second feed signal of the N78 frequency band and a fourth feed signal of the GPS L1 frequency band. It should be noted that the above-mentioned frequency bands are only used for exemplary descriptions and are not used to limit the protection scope of this embodiment.

[0054] In one embodiment, the electronic device further includes a back cover 30, a main board 24 and a pressure plate bracket. The specific implementation of the back cover 30 and the main board 24 can be referred to Figure 1 The description is not repeated here.

[0055] The pressure plate bracket is located between the rear cover 30 and the main board 24, and covers the main board 24 so that the main board 24 is fixed to the inner side of the rear cover 30. Specifically, the pressure plate bracket covers the various components on the main board 24, so that the various components on the main board 24 are more stable. For example, the pressure plate bracket can cover the board-to-board connector on the main board 24, and the pressure plate bracket can cover the plug-in components on the main board 24. The pressure plate bracket can also cover the various components on the main board 24 to protect the various components on the main board 24. The parasitic radiator 300 is connected to the pressure plate bracket. Exemplarily, the pressure plate bracket is a structural member integrally formed of metal parts and non-metal parts, so that the metal part of the pressure plate bracket is used to connect the parasitic radiator 300 to the ground through the pressure plate bracket.

[0056] In the embodiments of the application, Figure 3 As shown, the parasitic radiator 300 is connected to the pressure plate bracket, so that the space in the electronic device can be fully utilized to improve the directional pattern of the first frequency band. In the case where the parasitic radiator 300 is a flexible circuit board antenna, the parasitic radiator 300 can be pasted on the pressure plate bracket. Moreover, the flexible circuit board antenna can be bent and folded to a certain extent, has high flexibility in design, and can adapt to various complex installation environments. In the case where the parasitic radiator 300 is a laser branch forming antenna, it can be directly prepared on the pressure plate bracket by laser, and the internal metal interference of the electronic device can be reduced. In addition, the volume of the flexible circuit board antenna and the laser branch forming antenna is relatively small, which can effectively reduce the volume of the antenna assembly.

[0057] In one embodiment, the main board 24 is provided with a spring connected to the reference ground 23, a pressure plate support body and a conductive structure.

[0058] The conductive structure is provided on the bracket body, one end of the conductive structure is connected to the ground end of the parasitic radiator 300, and the other end of the conductive structure is used to abut against the spring. Specifically, the conductive structure extends from the side of the pressure plate bracket toward the main board 24 to the side toward the parasitic radiator 300. Most of the area of ​​the pressure plate bracket can be a non-metallic area, so that the pressure plate bracket can provide an insulating environment and effectively stabilize the various devices on the main board 24. The conductive structure can extend on the pressure plate bracket according to a preset route, so that the conductive structure can avoid the position of the pressure plate bracket pressing the electronic device on the main board 24, and prevent the conductive structure from short-circuiting with the electronic device on the main board 24.

[0059] In the embodiment of the application, the conductive structure provided on the pressure plate bracket can be used to connect the parasitic radiator 300 to the spring on the main board 24 in a targeted manner, and then connected to the reference floor 23 through the spring, so as to achieve the grounding of the parasitic radiator 300. Moreover, by stacking the main board 24 with the pressure plate bracket, the space on the pressure plate bracket can be fully utilized, so that the internal structure of the electronic device is compact and the conductive structure between the parasitic radiator 300 and the reference floor 23 is simplified. When assembling the electronic device, it is only necessary to press the pressure plate bracket onto the main board 24 to achieve the conduction between the parasitic radiator 300 and the reference floor 23 and ensure the conduction performance between the parasitic radiator 300 and the reference floor 23.

[0060] In one embodiment, the spring sheet provided on the main board 24 is provided with a fixed end and an elastic abutting end. The fixed end is fixed to one end of the main board 24 facing the pressure plate bracket and is connected to the reference floor 23 through the main board 24. The elastic abutting end abuts against the conductive structure on the pressure plate bracket. After the pressure plate bracket and the main board 24 are pressed together, the elastic abutting end is elastically deformed by the pressing action of the pressure plate bracket, so that the elastic abutting end can be firmly abutted against the conductive structure.

[0061] In an exemplary embodiment, the fixed end of the spring is welded to the reference floor 23 on the main board 24, so that the reference floor 23 is firmly connected to the spring. In another exemplary embodiment, the fixed end of the spring and the reference floor 23 on the main board 24 can be connected through a jack to facilitate the removal and maintenance of the spring. Optionally, the fixed end of the spring can also be bonded to the reference floor 23 on the main board 24 through a conductive adhesive, so that the spring and the main board 24 can be quickly assembled and firmly assembled.

[0062] In one embodiment, the parasitic radiator 300 is at least partially disposed on a surface of the bracket body away from the main board 24 .

[0063] The conductive structure includes a conductive layer and a conductive member. The conductive layer is disposed on the surface of the bracket body close to the main board 24. One end of the conductive member is connected to the ground end of the parasitic radiator 300, and the other end of the conductive member extends to the surface of the bracket body close to the main board 24 and is connected to the conductive layer. The conductive layer can provide a larger effective coverage area, so that the elastic abutting end of the spring can effectively contact the conductive layer of the conductive structure, reducing the disconnection of the conductive elastic member and the conductive structure, thereby improving the conductivity of the conductive structure.

[0064] In an exemplary embodiment, the conductive member includes a metal trace, and the metal trace can be provided on the platen support by laser direct forming technology. The metal trace extends along the surface of the platen support to ensure the conductive performance of the metal trace. The metal trace can also be formed on the platen support by metal plating process or screen printing process, so that the conductive member can be formed quickly and easily. In another exemplary embodiment, the conductive member includes a columnar metal conductor that passes through the platen support.

[0065] In one embodiment, the first radiator 100 includes a first feeding point A1 , a first free end B1 , and a first ground end C1 . The first feeding point A1 is connected to the first feed source S1 , and the first ground end C1 is connected to the reference ground 23 .

[0066] Among them, the free end can be understood as the end of the radiator that is not connected to the conductive part, or has a gap between the radiator and the conductive part, or is isolated from the conductive part by an insulating material. The grounding end can be understood as the end of the radiator connected to the reference floor 23. The feeding point can be understood as the end, port, or position of the radiator connected to the corresponding feed source. Similar names in the following embodiments have similar meanings and will not be repeated later.

[0067] The first feed source S1 and the first feeding point A1 can be directly welded, or connected via a coaxial line, a microstrip line, a conductive spring, a conductive adhesive, a circuit board or other connectors, which is not limited here.

[0068] The first grounding point is connected to the reference floor 23 through the first grounding member, for example, one end of the first grounding member is welded at the first grounding point, and the other end of the first grounding member is welded on the reference floor 23. Further, the reference floor 23 connected to the first grounding point may be the reference floor 23 of the middle frame 20. Since the first grounding point is connected to the reference floor 23 of the middle frame 20 through the first grounding member, the return path of the first radiator 100 at the first grounding point is shorter than that through the mainboard 24.

[0069] In an exemplary embodiment, the first feed source S1 can excite all the first radiators 100 between the first ground terminal C1 and the first free end B1 to generate a resonant mode supporting the first frequency band. That is, the resonant current of the resonant mode is mainly distributed from the first ground terminal C1 to the first free end B1 of the first radiator 100. In another exemplary embodiment, the first feed source S1 can excite part of the first radiator 100 between the first ground terminal C1 and the first free end B1 to generate a resonant mode supporting the first frequency band. That is, the resonant current of the resonant mode is mainly distributed from the first position point of the first radiator 100 to the first free end B1. The first position point is located between the first ground terminal C1 and the first free end B1 of the first radiator 100, and is spaced from the first ground terminal C1. Optionally, the first position point coincides with the first feeding point A1, or the first position point is located between the first feeding point A1 and the first ground terminal C1.

[0070] In one embodiment, the first radiator 100 operates in a 1 / 4 wavelength mode between the first feeding point A1 and the first ground terminal C1. By making the first radiator 100 operate in the 1 / 4 wavelength mode, the radiation efficiency of the first radiator 100 can be higher, so that the first radiator 100 can be ensured to have higher efficiency and wider bandwidth when supporting the first frequency band under the excitation of the first feed source S1.

[0071] In one embodiment, the second radiator 200 includes a second feeding point A2 , a second free end B2 , and a second ground end C2 . The second feeding point A2 is connected to the second feed source S2 , and the second ground end C2 is connected to the reference ground 23 .

[0072] The second feed source S2 and the second feeding point A2 can be directly welded, or connected through a coaxial line, a microstrip line, a conductive spring, a conductive adhesive, a circuit board or other connecting parts, which is not limited here.

[0073] The second grounding point is connected to the reference floor 23 through the second grounding member, for example, one end of the second grounding member is welded at the second grounding point, and the other end of the second grounding member is welded on the reference floor 23. Further, the reference floor 23 connected to the second grounding point may be the reference floor 23 of the middle frame 20. Since the second grounding point is connected to the reference floor 23 of the middle frame 20 through the second grounding member, the return path of the second radiator 200 at the second grounding point is shorter than that through the mainboard 24.

[0074] In an exemplary manner, the second feed source S2 can excite all the second radiators 200 between the second ground terminal C2 and the second free end B2 to generate a resonant mode supporting the first frequency band. That is, the resonant current of the resonant mode is mainly distributed from the second ground terminal C2 to the second free end B2 of the second radiator 200. In another exemplary manner, the second feed source S2 can excite part of the second radiator 200 between the second ground terminal C2 and the second free end B2 to generate a resonant mode supporting the first frequency band. That is, the resonant current of the resonant mode is mainly distributed from the second position point of the second radiator 200 to the second free end B2. The second position point is located between the second ground terminal C2 and the second free end B2 of the second radiator 200, and is spaced from the second ground terminal C2. Optionally, the second position point coincides with the second feeding point A2, or the second position point is located between the second feeding point A2 and the second ground terminal C2.

[0075] In one embodiment, the second radiator 200 operates in a 1 / 4 wavelength mode between the second feeding point A2 and the second ground terminal C2. By making the second radiator 200 operate in the 1 / 4 wavelength mode, the radiation efficiency of the second radiator 200 can be higher, so that the second radiator 200 can be ensured to have higher efficiency and wider bandwidth when supporting the first frequency band under the excitation of the second feed source S2.

[0076] Figure 4 FIG. 2 is a partial schematic diagram of an electronic device according to an embodiment of the present invention. Figure 4 , shows an antenna assembly in an electronic device, the antenna assembly includes a first radiator 100, a second radiator 200 and a parasitic radiator 300. The first free end B1 of the first radiator 100 is arranged and connected close to the second free end B2 of the second radiator 200, and a return point connected to the reference floor 23 is provided at the connection. That is, the first radiator 100 is connected to the second radiator 200 and shares a return point. Therefore, the first ground terminal C1 of the first radiator 100 and the second ground terminal C2 of the second radiator 200 can be connected to the reference floor 23 through the same grounding member. The above-mentioned shared return point method can, on the one hand, reduce the number of grounding members required to be set in the antenna assembly, and on the other hand, it can also save the gap between the first radiator 100 and the second radiator 200, thereby reducing the overall volume of the antenna assembly.

[0077] In the related art, as the number of frequency bands covered by electronic devices increases, the space left for antenna components in electronic devices becomes smaller and smaller, resulting in a small distance between multiple MIMO antennas in the same frequency band. Moreover, the first radiator 100 and the second radiator 200 both operate in the first frequency band, and the signals on the two radiators will overlap and interfere with each other, resulting in poor isolation characteristics between the first radiator 100 and the second radiator 200.

[0078] In one embodiment, the parasitic radiator 300 is disposed close to the second radiator 200. The parasitic radiator 300 is disposed close to the second radiator 200, which means that the distance between the parasitic radiator 300 and the second radiator 200 is greater than the distance between the parasitic radiator 300 and the first radiator 100. When the distance between the parasitic radiator 300 and the second radiator 200 is close, the electromagnetic field distribution between them will affect each other. Due to the propagation characteristics of the electromagnetic field, the electromagnetic field intensity is greater in a close distance, so the electromagnetic energy between the parasitic radiator 300 and the second radiator 200 is more easily transferred to each other, thereby enhancing the coupling effect between the two.

[0079] Further, the second radiator 200 and the parasitic radiator 300 have the same opening direction. The opening direction refers to the specific orientation of the radiator relative to the reference floor 23. The electromagnetic field distribution generated by the radiators with the same opening direction in space is similar, and this similarity makes it easier for the electromagnetic energy between the parasitic radiator 300 and the second radiator 200 to be transmitted to each other, thereby enhancing the coupling effect. Moreover, when the opening directions of the parasitic radiator 300 and the second radiator 200 are the same, the current path between them also presents a certain symmetry. This symmetry helps the current to flow more smoothly between the parasitic radiator 300 and the second radiator 200, further promoting the occurrence of coupling. By enhancing the coupling effect between the second radiator 200 and the parasitic radiator 300, this embodiment can effectively reduce the coupling effect between the second radiator 200 and the first radiator 100, thereby effectively improving the isolation between the first radiator 100 and the second radiator 200 by decoupling.

[0080] In one embodiment, the second radiator 200 includes a second feeding point A2, a second free end B2 and a second ground end C2, the second feeding point A2 is connected to the second feed source S2, and the second ground end C2 is connected to the reference floor 23. The parasitic radiator 300 includes a third ground end C3 and a third free end B3. The third free end B3 is close to the second free end B2, and the third ground end C3 is close to the second ground end C2. The arrangement of the second radiator 200 and the parasitic radiator 300 of this embodiment has a relatively simple structure, and can achieve the same opening direction of the second radiator 200 and the parasitic radiator 300, thereby enhancing the coupling effect between the parasitic radiator 300 and the second radiator 200.

[0081] In one embodiment, the antenna assembly further includes a tuning point connected to the parasitic radiator 300. The tuning point can be understood as the end, port, or position of the radiator connected to the corresponding tuning circuit. The position of the tuning point between the first feeding point A1 and the first grounding point can be relatively close to the first feeding point A1, or the position of the tuning point between the first feeding point A1 and the first grounding point can be relatively close to the first grounding point, or the position of the tuning point between the first feeding point A1 and the first grounding point can be located at the midpoint between the first feeding point A1 and the first grounding point, which is not limited in this embodiment.

[0082] The antenna assembly also includes a tuning circuit. Figure 5 is a schematic diagram of a tuning circuit according to an embodiment, referring to Figure 5, the tuning circuit includes but is not limited to at least one capacitive element and / or at least one inductive element. One end of the tuning circuit is connected to the tuning point, and the other end of the tuning circuit is grounded. The tuning circuit and the tuning point can be directly connected or indirectly connected. For example, the tuning circuit and the tuning point can be directly welded, or connected by any one of a conductive wire, a conductive spring, a conductive glue, a circuit board, etc. The tuning circuit and the reference floor 23 can be directly connected or indirectly connected. For example, the tuning circuit and the reference floor 23 can be directly welded, or connected by any one of a conductive wire, a conductive spring, a conductive glue, a circuit board, etc. The tuning circuit can adjust the electrical length of the parasitic radiator 300, so that at least part of the parasitic radiator 300 between the third ground terminal C3 and the third free end B3 can generate a parasitic current of the first frequency band, thereby exciting a lateral current on the reference floor 23, and then adjusting the directivity pattern of the first frequency band of the electronic device.

[0083] FIG6 (a) is a color data diagram of the S parameters of an electronic device of an embodiment, and FIG6 (b) is a gray data diagram of the S parameters of an electronic device of an embodiment. Among them, S11 represents the reflection coefficient of port 1, that is, the ratio of the energy reflected from port 1 to the energy entering from port 1. It measures the degree of reflection caused by impedance mismatch and other reasons during the transmission of the signal. Ideally, S11 should be as small as possible, indicating that the reflected energy is small and the signal transmission efficiency is high. S13 represents the reverse transmission coefficient from port 1 to port 3, that is, when the signal is input from port 3, the ratio of the signal strength detected at port 1 to the signal strength input at port 3. It reflects the isolation or crosstalk between two different ports. Ideally, S13 should be as small as possible, indicating that the mutual influence between the two ports is small. S33 represents the reflection coefficient of port 3, that is, the ratio of the energy reflected from port 3 to the energy entering from port 3. It is similar to S11, but is for port 3. Similarly, S33 should also be as small as possible to reduce the reflection of the signal at port 3.

[0084] In combination with reference to Figure 6 (a) and Figure 6 (b), based on the setting method of the radiator of the embodiment of the present application, it can be seen from the reference S11 parameter that the electronic device has an S11 of -10.71dB at 1.575GHz in the GPS L1 frequency band. The S11 at 3.4GHz in the N78 frequency band is -4.75dB, and the S11 at 3.6 GHz is -25.68dB. Therefore, the S11 parameters of the electronic device at each key frequency point have good performance. Similarly, referring to the S33 parameter, it can be seen that the S33 at 2.36GHz near the WIFI 2.4G frequency band is -4.72dB, and the S33 at 2.5GHz is -4.19dB. The S33 at 3.4GHz in the N78 frequency band is -10.65dB, and the S11 at 3.6 GHz is -4.02dB. Therefore, the S33 parameters of the electronic device at each key frequency point also have good performance. Moreover, referring to the S13 parameter, when the first radiator 100 and the second radiator 200 support MIMO reception in the N78 frequency band, the antenna isolation can reach -22dB. Therefore, the interference between the first radiator 100 and the second radiator 200 is small, which can meet the user's usage requirements.

[0085] FIG7 (a) is a color image of the directional diagram of the first radiator 100 of an embodiment, and FIG7 (b) is a grayscale image of the directional diagram of the first radiator 100 of an embodiment. FIG8 (a) is a color image of the directional diagram of the second radiator 200 of an embodiment, and FIG8 (b) is a grayscale image of the directional diagram of the second radiator 200 of an embodiment. FIG9 (a) is a color image of the composite directional diagram of the electronic device of the embodiment of the present application, and FIG9 (b) is a grayscale image of the composite directional diagram of the electronic device of the embodiment of the present application. FIG9 (a) and FIG9 (b) show the directional diagram of the first radiator 100 and the second radiator 200, and the directional diagram formed by the composite of the first radiator 100 and the second radiator 200. FIG10 (a) is a color image of the directional diagram of the electronic device of the embodiment of the present application and the related art, and FIG10 (b) is a grayscale image of the directional diagram of the electronic device of the embodiment of the present application and the related art. Combined with FIG7 to FIG10, the embodiment of the present application has an enhancement on the left side of the whole machine, and the maximum point has an improvement of 3.9dB. It can be seen from this that the embodiment of the present application can achieve directional pattern tuning of the first frequency band by adding parasitic radiators 300 in the form of but not limited to FPC, LDS, PDS, etc. to the pressure plate bracket, so that the mobile phone has no dead spots in the signal at different azimuth angles and a good Internet experience.

[0086] Fig.11 FIG. 3 is a partial schematic diagram of an electronic device according to an embodiment of the present invention. Fig.11 , shows an antenna assembly in an electronic device, the antenna assembly includes a first radiator 100, a second radiator 200 and a parasitic radiator 300.

[0087] The antenna assembly also includes a third feed source S3. The first radiator 100 includes a first feed point A1, a third feed point A3, a first free end B1 and a first ground end C1, the first feed point A1 is connected to the first feed source S1, the third feed point A3 is connected to the third feed source S3, and the first ground end C1 is connected to the reference floor 23. The third feed source S3 and the third feed point A3 can be directly welded, or connected through a coaxial line, a microstrip line, a conductive spring, a conductive glue, a circuit board and other connectors, which are not limited here. The third feed source S3 and the first feed source S1 are used to provide a fifth feed signal of the second frequency band to the first radiator 100 to support the transmission and reception of radio frequency signals in the second frequency band. Specifically, the first radiator 100 can operate in a 1 / 4 wavelength mode between the first ground end C1 and the first free end B1 under the excitation of the third feed source S3. By making the first radiator 100 work in the 1 / 4 wavelength mode, the radiation efficiency of the first radiator 100 can be higher, so that the first radiator 100 can be ensured to have higher efficiency and wider bandwidth when supporting the second frequency band under the excitation of the third feed source S3. The third frequency band is, for example, a low frequency band to meet the L+L communication requirements in some scenarios.

[0088] It can be understood that the path between the third feeding point A3 and the third feed source S3 is equivalent to a short circuit for the first frequency band. Therefore, the first excitation current can still return to the ground at the third feeding point A3, so that the first radiator 100 operates in the 1 / 4 wavelength mode between the first feeding point A1 and the third feeding point A3 under the excitation of the first feed source S1.

[0089] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0090] The above embodiments only express several embodiments of the embodiments of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the embodiments of the present application, and these all belong to the protection scope of the embodiments of the present application. Therefore, the protection scope of the patent of the embodiments of the present application shall be subject to the attached claims.

Claims

1. An electronic device, characterized in that: It includes a reference floor and an antenna assembly, the antenna assembly including: A first radiator and a first feed source connected to each other, wherein the first radiator is used to generate a first excitation current under the excitation of the first feed source to support the transmission and reception of radio frequency signals in a first frequency band; A second radiator and a second feed source connected to each other, wherein the second radiator is used to generate a second excitation current under the excitation of the second feed source to support the transmission and reception of radio frequency signals in the first frequency band; a parasitic radiator, configured to couple with the first radiator and / or the second radiator to generate a parasitic current in the first frequency band; The reference floor is used to generate a longitudinal current on the reference floor under the action of the first excitation current and the second excitation current, and to generate a transverse current on the reference floor under the excitation of the parasitic current, and the amplitudes of the longitudinal current and the transverse current are within the same preset range.

2. The electronic device according to claim 1, characterized in that: Also includes: Back cover; Motherboard; A pressure plate bracket is located between the rear cover and the main board and presses the main board so that the main board is fixed to the inner side of the rear cover; Wherein, the parasitic radiator is connected to the pressure plate bracket.

3. The electronic device according to claim 2, characterized in that: The main board is provided with a spring sheet connected to the reference floor, and the pressure plate bracket comprises: The bracket body; A conductive structure is arranged on the bracket body, one end of the conductive structure is connected to the ground end of the parasitic radiator, and the other end of the conductive structure is used to abut against the spring.

4. The electronic device according to claim 3, characterized in that: The parasitic radiator is at least partially disposed on a surface of the bracket body away from the main board; The conductive structure includes a conductive layer and a conductive member, wherein the conductive layer is arranged on a surface of the bracket body close to the main board, one end of the conductive member is connected to the ground end of the parasitic radiator, and the other end of the conductive member extends to the surface of the bracket body close to the main board and is connected to the conductive layer.

5. The electronic device according to claim 1, characterized in that: The first radiator comprises a first feeding point, a first free end and a first grounding end, the first feeding point is connected to the first feed source, and the first grounding end is connected to the reference ground; The first radiator operates in a 1 / 4 wavelength mode between the first feeding point and the first ground end.

6. The electronic device according to claim 1, characterized in that: Also included is a third feed; The first radiator comprises a first feeding point, a third feeding point, a first free end and a first grounding end, the first feeding point is connected to the first feed source, the third feeding point is connected to the third feed source, and the first grounding end is connected to the reference ground; Wherein, the first radiator operates in a 1 / 4 wavelength mode between the first feeding point and the third feeding point under the excitation of the first feed source, and operates in a 1 / 4 wavelength mode between the first ground end and the first free end under the excitation of the third feed source to support the transmission and reception of RF signals in a second frequency band; the second frequency band is different from the first frequency band.

7. The electronic device according to claim 5 or 6, characterized in that: The second radiator comprises a second feeding point, a second free end and a second ground end, the second feeding point is connected to the second feed source, and the second ground end is connected to the reference ground; The second radiator operates in a 1 / 4 wavelength mode between the second feeding point and the second ground end.

8. The electronic device according to claim 7, characterized in that: The first free end of the first radiator is disposed close to and connected to the second free end of the second radiator, and a return point connected to the reference floor is provided at the connection.

9. The electronic device according to claim 1, characterized in that: The parasitic radiator is arranged close to the second radiator, and the second radiator and the parasitic radiator have the same opening direction.

10. The electronic device according to claim 9, characterized in that: The second radiator comprises a second feeding point, a second free end and a second ground end, the second feeding point is connected to the second feed source, and the second ground end is connected to the reference ground; The parasitic radiator includes a third ground terminal and a third free terminal; The third free end is close to the second free end, and the third ground end is close to the second ground end.

11. The electronic device according to claim 1, characterized in that: The first radiator and the second radiator are used to jointly support MIMO reception of radio frequency signals in the first frequency band.

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