Electronic device

Abstract

The application provides an electronic device, comprising a reference floor and an antenna unit. The antenna unit comprises an antenna radiator, a feed source, a first tuning circuit and a grounding piece. One end of the antenna radiator forms a first free end, the other end of the antenna radiator forms a second free end, a feed point and an electrical connection point on the side of the feed point away from the first free end are arranged between the first free end and the second free end, the feed point is electrically connected to the feed source through the first tuning circuit, one end of the grounding piece is electrically connected to the electrical connection point, and the other end of the grounding piece is electrically connected to the reference floor. The grounding piece, the electrical connection point and the first free end generate a first resonant mode supporting a first frequency band. The antenna radiator between the second free end and the first free end generates a second resonant mode supporting a second frequency band. The antenna radiator between the feed point and the first free end generates a third resonant mode supporting a third frequency band. The electronic device provided by the application can support multiple frequency bands and has flexible structure design.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronics, in particular to an electronic device. BACKGROUND

[0002] In the related art, the multi-band and wide-band performance of an antenna is achieved by adding a parasitic radiation branch. This technical solution requires more structure design of the antenna. SUMMARY

[0003] The present application provides an electronic device capable of realizing multi-band and flexible structure design.

[0004] Specifically, the present application provides an electronic device, comprising:

[0005] a reference ground plate; and

[0006] an antenna unit comprising an antenna radiator, a feed source, a first tuning circuit and a grounding member, one end of the antenna radiator forms a first free end, the other end of the antenna radiator forms a second free end, a feed point and an electrical connection point located on the side of the feed point away from the first free end are arranged between the first free end and the second free end, the feed point is electrically connected to the feed source through the first tuning circuit, one end of the grounding member is electrically connected to the electrical connection point, and the other end of the grounding member is electrically connected to the reference ground plate;

[0007] wherein the antenna radiator between the grounding member, the electrical connection point and the first free end generates a first resonant mode supporting a first frequency band under the excitation of the feed source; the antenna radiator between the second free end and the first free end generates a second resonant mode supporting a second frequency band under the excitation of the feed source; and the antenna radiator between the feed point and the first free end generates a third resonant mode supporting a third frequency band under the excitation of the feed source.

[0008] The electronic device provided in the application comprises a reference floor and an antenna unit, the antenna unit comprises an antenna radiator, a feed source, a first tuning circuit and a grounding member, one end of the antenna radiator is formed into a first free end, the other end of the antenna radiator is formed into a second free end, a feed point is designed between the first free end and the second free end, and an electrical connection point is designed on the side of the feed point away from the first free end, the feed point is electrically connected to the feed source through the first tuning circuit, one end of the grounding member is electrically connected to the electrical connection point, and the other end of the grounding member is electrically connected to the reference floor, so that the feed source, the first tuning circuit, the antenna radiator between the first free end and the second free end form a T-shaped antenna, the feed source, the first tuning circuit, the grounding member and the antenna radiator between the electrical connection point and the first free end form an inverted F-shaped antenna, in this way, the antenna radiator between the electrical connection point and the first free end produces a first resonant mode under the excitation of the feed source, the antenna radiator between the second free end and the first free end produces a second resonant mode under the excitation of the feed source, and the antenna radiator between the feed point and the first free end produces a third resonant mode under the excitation of the feed source, so that the antenna unit supports the first frequency band, the second frequency band and the third frequency band, and the communication frequency band of the electronic device is widened. Since no parasitic radiation branch is added, but different types of antenna units are formed by adding the grounding member to produce multiple resonant modes, the structure design of the antenna unit is simpler and more flexible, and is more conducive to miniaturization. BRIEF DESCRIPTION OF DRAWINGS

[0009] In order to more clearly illustrate the technical solutions of the embodiments of the application, the drawings needed to be used in the embodiments will be briefly introduced.

[0010] Figure 1 A structural schematic diagram of an electronic device provided in the application is shown in the figure.

[0011] Figure 2 A structural schematic diagram of an antenna unit in the electronic device shown in the figure is shown in the figure. Figure 1

[0012] Figure 3 A structural schematic diagram of the grounding member of the antenna unit shown in the figure is replaced by a grounding circuit with inductance and / or capacitance devices. Figure 2

[0013] Figure 4 A resonant current distribution schematic diagram of a first resonant mode of the antenna unit shown in the figure is shown in the figure. Figure 2

[0014] Figure 5 A resonant current distribution schematic diagram of a second resonant mode of the antenna unit shown in the figure is shown in the figure. Figure 2

[0015] Figure 6 A resonant current distribution schematic diagram of a third resonant mode of the antenna unit shown in the figure is shown in the figure. Figure 2 ​​​​A schematic diagram of a resonant current distribution of a third resonant mode of the antenna unit shown in FIG. 1;

[0016] Figure 7 A schematic diagram of a resonant current distribution of a fourth resonant mode of the antenna unit shown in FIG. 1; Figure 2 A schematic diagram of the antenna unit shown in FIG. 1 with several length parameters labeled;

[0017] Figure 8 A schematic diagram of a resonant current distribution of a fourth resonant mode of the antenna unit shown in FIG. 1; Figure 2 A schematic diagram of the antenna unit shown in FIG. 1 with several length parameters labeled;

[0018] Figure 9 A schematic diagram of the antenna unit shown in FIG. 1 with several length parameters labeled; Figure 2 A schematic diagram of the antenna unit shown in FIG. 1 with the length of the ground member, the length of the antenna radiator between the electrical connection point and the feed point labeled;

[0019] Figure 10 A schematic diagram of the antenna unit shown in FIG. 1 with the length of the antenna radiator between the electrical connection point and the second free end labeled; Figure 2 A schematic diagram of the antenna unit shown in FIG. 1 with the length of the antenna radiator between the electrical connection point and the second free end labeled;

[0020] Figure 11 A schematic diagram of the antenna unit shown in FIG. 1 with the length of the antenna radiator between the electrical connection point and the second free end labeled; Figure 2 A schematic diagram of the antenna unit shown in FIG. 1 with the ground member being a ground wire, the first lead end of the ground wire being electrically connected to the electrical connection point of the antenna radiator, and the second lead end of the ground wire being electrically connected to the reference ground plane;

[0021] Figure 12 A schematic diagram of the antenna unit shown in FIG. 1 with the ground member being a ground wire, the first lead end of the ground wire being electrically connected to the electrical connection point of the antenna radiator, and the second lead end of the ground wire being electrically connected to the reference ground plane; Figure 1 A schematic diagram of the antenna unit shown in FIG. 1 with the ground member being a ground wire, the first lead end of the ground wire being electrically connected to the electrical connection point of the antenna radiator, and the second lead end of the ground wire being electrically connected to the reference ground plane;

[0022] Figure 13 A schematic diagram of a resonant current distribution of a second resonant mode of the antenna unit shown in FIG. 1; Figure 12 A schematic diagram of a resonant current distribution of a second resonant mode of the antenna unit shown in FIG. 1;

[0023] Figure 14 A schematic diagram of a resonant current distribution of a first resonant mode of the antenna unit shown in FIG. 1; Figure 12 A schematic diagram of a resonant current distribution of a first resonant mode of the antenna unit shown in FIG. 1;

[0024] Figure 15 A schematic diagram of a resonant current distribution of a fourth resonant mode of the antenna unit shown in FIG. 1; Figure 12 A schematic diagram of a resonant current distribution of a fourth resonant mode of the antenna unit shown in FIG. 1;

[0025] Figure 16 A schematic diagram of the reference ground plane of the electronic device shown in FIG. 1, including a first edge and a second edge connected by a bend, the first radiating segment of the antenna radiator being located on a side of the first edge away from the center of the reference ground plane, and the second radiating segment being located on a side of the second edge away from the center of the reference ground plane; Figure 12 A schematic diagram of the reference ground plane of the electronic device shown in FIG. 1, including a first edge and a second edge connected by a bend, the first radiating segment of the antenna radiator being located on a side of the first edge away from the center of the reference ground plane, and the second radiating segment being located on a side of the second edge away from the center of the reference ground plane;

[0026] Figure 17 A schematic diagram of the reference ground plane of the electronic device shown in FIG. 1, including a first edge and a second edge connected by a bend, the first radiating segment of the antenna radiator being located on a side of the first edge away from the center of the reference ground plane, and the second radiating segment being located on a side of the second edge away from the center of the reference ground plane; Figure 16 A schematic diagram of the reference ground plane of the electronic device shown in FIG. 1, including a first edge and a second edge connected by a bend, the first radiating segment of the antenna radiator being located on a side of the first edge away from the center of the reference ground plane, and the second radiating segment being located on a side of the second edge away from the center of the reference ground plane;

[0027] Figure 18 For Figure 16 The schematic diagram of the electronic device shown in the figure labels the distance between the projection point of the other end of the grounding member on the reference floor and the floor corner point;

[0028] Figure 19 For Figure 18 The structural schematic diagram of the electronic device shown in the figure, the length of the first edge of the reference floor is greater than the length of the second edge;

[0029] Figure 20 For Figure 16 The schematic diagram of the resonant current distribution of the fourth resonant mode of the antenna unit shown in the figure;

[0030] Figure 21 For Figure 12 The structural schematic diagram of the antenna unit shown in the figure further includes a second tuning circuit;

[0031] Figure 22 For Figure 1 The structural schematic diagram of the electronic device shown in the figure, the reference floor, the feed, the first tuning circuit, and the grounding member are located in the accommodation space formed by the frame, and the antenna radiator is arranged on the frame;

[0032] Figure 23 The return loss and efficiency curve diagram of the electronic device provided by the embodiment of the present application;

[0033] Figure 24 The SAR value test diagram of the electronic device provided by the embodiment of the present application.

[0034] Explanation of reference signs:

[0035] Electronic device 1000; reference floor 200; antenna unit 100; first sub-frame 31; second sub-frame 32; third sub-frame 33; fourth sub-frame 34; antenna radiator 10; feed 20; first tuning circuit 30; grounding member 40; first free end 11; second free end 12; feed point 13; electrical connection point 14; first lead end 401; second lead end 402; first radiation section 101; second radiation section 102; first edge 21; second edge 22; floor corner point 25; third edge 23; fourth edge 24; second tuning circuit 50. DETAILED DESCRIPTION

[0036] The technical solutions provided by the present application will be described in detail below with reference to the drawings. Obviously, the embodiments described in the present application are only part of the embodiments, not all embodiments. Based on the embodiments described in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the protection scope of the present application.

[0037] In this application, the terms "embodiment" or "implementation" mean that a specific feature, structure, or characteristic described in connection with an embodiment or implementation can be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment to other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described in this application can be combined with other embodiments.

[0038] The terms “first,” “second,” etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, rather than to describe a particular order; the terms “comprising” and “having,” and any variations thereof, are intended to cover non-exclusive inclusion.

[0039] like Figure 1 As shown, Figure 1 This is a schematic diagram of the structure of an electronic device 1000 provided in an embodiment of this application. The electronic device 1000 can be a mobile phone, tablet, laptop, watch, drone, robot, or other device with wireless communication capabilities. This embodiment of the application uses a mobile phone as an example. The electronic device 1000 includes a reference ground plane 200 and an antenna unit 100.

[0040] Reference ground 200 refers to the portion of electronic device 1000 that is considered to be conductive ground and is not affected by any grounding configuration. The potential of reference ground 200 is conventionally zero. For example, reference ground 200 may include the ground plane of the main circuit board, the ground plane of the secondary circuit board, the metal parts of the middle frame, and conductive parts that electrically connect one or more of the ground planes of the main circuit board, the ground plane of the secondary circuit board, and the metal parts of the middle frame in electronic device 1000.

[0041] The middle frame includes a border 300. The border 300 encloses and forms an accommodating space. In one possible embodiment, the border 300 may include a first sub-border 31, a second sub-border 32, a third sub-border 33, and a fourth sub-border 34 connected end-to-end in sequence. The first sub-border 31 and the third sub-border 33 are arranged opposite to each other. The second sub-border 32 and the fourth sub-border 34 are arranged opposite to each other. In this embodiment, the relative direction between the first sub-border 31 and the third sub-border 33 is defined as the width direction of the electronic device 1000, as shown in the attached figure. Figure 1 The Y-axis direction; the relative direction between the second sub-border 32 and the fourth sub-border 34 is defined as the length direction of the electronic device 1000, as shown in the appendix. Figure 1The length of the first sub-frame 31 can be equal to the length of the third sub-frame 33, and the length of the second sub-frame 32 can be equal to the length of the fourth sub-frame 34. The length of the first sub-frame 31 and the length of the third sub-frame 33 can be greater than the length of the second sub-frame 32 and the length of the fourth sub-frame 34.

[0042] In the embodiment, the first sub-frame 31 is the right side frame of the electronic device 1000, the second sub-frame 32 is the top frame of the electronic device 1000, the third sub-frame 33 is the left side frame of the electronic device 1000, and the fourth sub-frame 34 is the bottom frame of the electronic device 1000. Of course, in other possible embodiments, the first sub-frame 31 can also be the left side frame of the electronic device 1000, the second sub-frame 32 can also be the top frame of the electronic device 1000, the third sub-frame 33 can also be the right side frame of the electronic device 1000, and the fourth sub-frame 34 can also be the bottom frame of the electronic device 1000; or, the first sub-frame 31 can also be the right side frame of the electronic device 1000, the second sub-frame 32 can also be the bottom frame of the electronic device 1000, the third sub-frame 33 can also be the left side frame of the electronic device 1000, and the fourth sub-frame 34 can also be the top frame of the electronic device 1000; or, the first sub-frame 31 can also be the left side frame of the electronic device 1000, the second sub-frame 32 can also be the bottom frame of the electronic device 1000, the third sub-frame 33 can also be the right side frame of the electronic device 1000, and the fourth sub-frame 34 can also be the top frame of the electronic device 1000; or, the first sub-frame 31 can also be the right side frame of the electronic device 1000, the second sub-frame 32 can also be the bottom frame of the electronic device 1000, the third sub-frame 33 can also be the left side frame of the electronic device 1000, and the fourth sub-frame 34 can also be the top frame of the electronic device 1000.

[0043] As shown in FIG. 1, the electronic device 1000 includes a first sub-frame 31, a second sub-frame 32, a third sub-frame 33, and a fourth sub-frame 34. Figure 2 As shown in FIG. 1, the electronic device 1000 includes a first sub-frame 31, a second sub-frame 32, a third sub-frame 33, and a fourth sub-frame 34. Figure 2 As shown in FIG. 1, the electronic device 1000 includes a first sub-frame 31, a second sub-frame 32, a third sub-frame 33, and a fourth sub-frame 34. Figure 1 As shown in FIG. 1, the electronic device 1000 includes a first sub-frame 31, a second sub-frame 32, a third sub-frame 33, and a fourth sub-frame 34.

[0044] The antenna radiator 10 can be a frame antenna radiator 10 or an internal antenna radiator 10. In other words, the antenna radiator 10 can be located on the frame 300 or in the accommodation space formed by the frame 300. The material of the antenna radiator 10 can be metal, alloy, etc. One end of the antenna radiator 10 forms a first free end 11. The other end of the antenna radiator 10 forms a second free end 12. The "free end" can be understood as an end that is not electrically connected to a conductive member or has a gap between the conductive member.

[0045] A power supply point 13 and an electrical connection point 14 are provided between the first free end 11 and the second free end 12. The power supply point 13 can be understood as a specific location between the first free end 11 and the second free end 12. The electrical connection point 14 can be understood as a specific location between the first free end 11 and the second free end 12, but different from the power supply point 13. It is understood that the power supply point 13 does not coincide with either the first free end 11 or the second free end 12; that is, the power supply point 13 is not located at either the first or second free end 11. The electrical connection point 14 does not coincide with either the first or second free end 11; that is, the electrical connection point 14 is not located at either the first or second free end 12. The power supply point 13 and the electrical connection point 14 are spaced apart. Understandably, the first free end 11, the power supply point 13, the electrical connection point 14, and the second free end 12 are arranged in sequence.

[0046] Feed 20 is electrically connected to the RF chip and can receive the RF current provided by the RF chip. Feed point 13 is electrically connected to feed 20 through first tuning circuit 30. In other words, first tuning circuit 30 is electrically connected between feed point 13 and feed 20. Feed point 13 and first tuning circuit 30 can be directly or indirectly connected. For example, feed point 13 and first tuning circuit 30 can be electrically connected through conductive wires, conductive posts, conductive sheets, conductive probes, or other electrical connectors. First tuning circuit 30 and feed 20 can also be directly or indirectly connected. For example, first tuning circuit 30 and feed 20 can be electrically connected through conductive wires, conductive posts, conductive sheets, conductive probes, or other electrical connectors.

[0047] The grounding component 40 can be a grounding wire or a grounding circuit with inductors and / or capacitors. One end of the grounding component 40 is electrically connected to the electrical connection point 14, and the other end of the grounding component 40 is electrically connected to the reference ground 200.

[0048] In one possible embodiment, such as Figure 2 As shown, grounding component 40 is a grounding wire. One end of the grounding wire is electrically connected to electrical connection point 14, and the other end is electrically connected to reference ground 200. The grounding wire and electrical connection point 14 can be directly or indirectly connected. For example, the grounding wire and electrical connection point 14 can be electrically connected using conductive wires, conductive posts, conductive sheets, conductive probes, or other electrical connectors. The grounding wire and reference ground 200 can also be directly or indirectly connected. For example, the grounding wire and reference ground 200 can be electrically connected using conductive wires, conductive posts, conductive sheets, conductive probes, or other electrical connectors.

[0049] In another possible embodiment, as shown in Figure 3 The ground member 40 is a ground circuit with inductance and / or capacitance and the like. The ground circuit is electrically connected with the electrical connection point 14, and the ground circuit is electrically connected with the reference ground plate 200. The electrical connection between the ground circuit and the electrical connection point 14 can be direct or indirect. For example, the electrical connection between the ground circuit and the electrical connection point 14 can be through an electrically conductive wire, an electrically conductive column, an electrically conductive sheet, an electrically conductive probe, and the like. The electrical connection between the ground circuit and the reference ground plate 200 can be direct or indirect. For example, the electrical connection between the ground circuit and the reference ground plate 200 can be through an electrically conductive wire, an electrically conductive column, an electrically conductive sheet, an electrically conductive probe, and the like. The design of the ground circuit needs to ensure that part of the resonant current on the antenna radiator 10 can return to the ground through the electrical connection point 14 and the ground circuit, and another part of the resonant current cannot return to the ground through the electrical connection point 14 and the ground circuit, which will be described in detail in the specific embodiments.

[0050] Please refer to Figures 4 to 6 The antenna radiator 10 between the ground member 40, the electrical connection point 14, and the first free end 11 generates a first resonant mode supporting the first frequency band under the excitation of the feed source 20. The antenna radiator 10 between the second free end 12 and the first free end 11 generates a second resonant mode supporting the second frequency band under the excitation of the feed source 20. The antenna radiator 10 between the feed point 13 and the first free end 11 generates a third resonant mode supporting the third frequency band under the excitation of the feed source 20.

[0051] As shown in Figure 4 The feed source 20, the first tuning circuit 30, the antenna radiator 10 between the electrical connection point 14 and the first free end 11, and the ground member 40 form an inverted F-type antenna. The antenna radiator 10 between the ground member 40, the electrical connection point 14, and the first free end 11 generates a first resonant mode under the excitation of the feed source 20, as shown by the dashed line in Figure 4 The first resonant mode includes resonant current from the other end of the ground member 40 to the electrical connection point 14 and resonant current from the electrical connection point 14 to the first free end 11. When the ground member 40 is a ground circuit with inductance and / or capacitance and the like, the design of the ground circuit needs to ensure that the resonant current of the first resonant mode can return to the ground through the electrical connection point 14 and the ground circuit.

[0052] As shown in Figure 5 The feed source 20, the first tuning circuit 30, the antenna radiator 10 between the first free end 11 and the second free end 12 form a T-type antenna. The antenna radiator 10 between the second free end 12 and the first free end 11 generates a second resonant mode under the excitation of the feed source 20, as shown by the dashed line in Figure 5As shown by the dashed line. The second resonant mode includes the resonant current from the first free end 11 to the second free end 12. When the grounding component 40 is a grounding circuit with inductors and / or capacitors, the design of the grounding circuit must ensure that the resonant current of the second resonant mode cannot return to ground through the electrical connection point 14 and the grounding circuit.

[0053] like Figure 6 As shown, the feed 20, the first tuning circuit 30, the antenna radiator 10 between the electrical connection point 14 and the first free end 11, and the grounding component 40 form an inverted F-type antenna. The third resonant mode generated by the antenna radiator 10 between the feed point 13 and the first free end 11 under the excitation of the feed 20 is as follows... Figure 6 As shown by the dashed line, the third resonant mode includes the resonant current from the feed point 13 to the first free end 11. Although both the third and first resonant modes are inverted-F antenna modes, the electrical length of the antenna radiator 10 corresponding to the resonant current in the first resonant mode is different from that in the third resonant mode. Therefore, the first and third resonant modes can support different first and third frequency bands, respectively.

[0054] The first tuning circuit 30 may include capacitors and / or inductors. This application does not specifically limit the number of capacitors or inductors included in the first tuning circuit 30. When the first tuning circuit 30 includes multiple capacitors, the capacitors may be connected in series or in parallel. When the first tuning circuit 30 includes multiple inductors, the inductors may be connected in series or in parallel. When the first tuning circuit 30 includes one or more capacitors and one or more inductors, the inductors and capacitors may be connected in series or in parallel. The first tuning circuit 30 is used to adjust the impedance of the antenna element 100, and can be used to achieve impedance matching of the antenna element 100 in the first resonant mode, the second resonant mode, and the third resonant mode.

[0055] The electronic device 1000 provided in this application includes a reference ground plane 200 and an antenna unit 100. The antenna unit 100 includes an antenna radiator 10, a feed 20, a first tuning circuit 30, and a grounding element 40. One end of the antenna radiator 10 forms a first free end 11, and the other end forms a second free end 12. A feed point 13 and an electrical connection point 14 located on the side of the feed point 13 away from the first free end 11 are designed between the first free end 11 and the second free end 12. The feed point 13 is electrically connected to the feed 20 through the first tuning circuit 30. One end of the grounding element 40 is electrically connected to the electrical connection point 14, and the other end of the grounding element 40 is electrically connected to the reference ground plane 200. This allows the feed 20, the first tuning circuit 30, the first free end 11, and the second free end 12 to be connected. The antenna radiators 10 between the free ends 12 form a T-shaped antenna, which allows the feed 20, the first tuning circuit 30, the grounding element 40, and the antenna radiators 10 between the electrical connection point 14 and the first free end 11 to form an inverted F-shaped antenna. Thus, when the antenna radiators 10 between the grounding element 40, the electrical connection point 14, and the first free end 11 generate a first resonant mode under the excitation of the feed 20, when the antenna radiators 10 between the second free end 12 and the first free end 11 generate a second resonant mode under the excitation of the feed 20, and when the antenna radiators 10 between the feed point 13 and the first free end 11 generate a third resonant mode under the excitation of the feed 20, the antenna element 100 supports the first, second, and third frequency bands, thus broadening the communication frequency band of the electronic device 1000. Since no parasitic radiating branches are added, but instead different types of antenna elements 100 are formed and multiple resonant modes are generated by adding the grounding element 40, the structural design of the antenna element 100 is simpler, more flexible, and more conducive to miniaturization.

[0056] Among them, such as Figure 7 As shown, the first frequency band is lower than the second frequency band, and the second frequency band is lower than the third frequency band. The first resonant mode is a 1 / 4 wavelength mode, the second resonant mode is a 1 / 2 wavelength mode, and the third resonant mode is a 1 / 4 wavelength mode.

[0057] Understandably, the sum of the length of the grounding component 40 and the length of the antenna radiator 10 between the electrical connection point 14 and the first free end 11 is 1 / 4 wavelength of the first frequency band. The length of the grounding component 40 can be found in the appendix. Figure 7 The length of the antenna radiator 10 between the electrical connection point 14 and the first free end 11, as shown in the attached diagram, can be referenced. Figure 7 L2 is shown. In the following embodiments, the sum of the length of the grounding member 40 and the length of the antenna radiator 10 between the electrical connection point 14 and the first free end 11 is also described as the overall length of the inverted F-type antenna. For example, when the first frequency band is a mid-to-high frequency band (1GHz to 3GHz), the overall length of the inverted F-type antenna can be 30mm to 60mm.

[0058] The length of the antenna radiator 10 between the first free end 11 and the second free end 12 is half the wavelength of the second frequency band. The length of the antenna radiator 10 between the first free end 11 and the second free end 12 can be referenced in the appendix. Figure 7 As shown in L3. It can be understood that the length of the antenna radiator 10 between the first free end 11 and the second free end 12 is the overall length of the antenna radiator 10, which is also described in the following embodiments as the overall length of the T-shaped antenna. For example, when the second frequency band is a mid-to-high frequency band, the overall length of the T-shaped antenna can be 30mm to 80mm. It should be noted that this application does not limit the overall length of the T-shaped antenna to be longer than the overall length of the inverted-F antenna; the specific design needs to be based on the actual supported first and second frequency bands. In other words, the overall length of the T-shaped antenna can be longer or shorter than the overall length of the inverted-F antenna.

[0059] The length of the antenna radiator 10 between the feed point 13 and the first free end 11 is 1 / 4 wavelength of the third frequency band. The length of the antenna radiator 10 between the feed point 13 and the first free end 11 can be referenced in the appendix. Figure 7 L4 is shown. For example, when the third frequency band is an ultra-high frequency band (greater than 3 GHz), the length of the antenna radiator 10 between the feed point 13 and the first free end 11 can be 10 mm to 30 mm.

[0060] Since the feed 20, the first tuning circuit 30, the antenna radiator 10 between the electrical connection point 14 and the first free end 11, and the grounding component 40 form an inverted F-type antenna, the antenna radiator 10 between the grounding component 40, the electrical connection point 14 and the first free end 11 is more likely to generate a first resonant mode supporting 1 / 4 wavelength of the first frequency band under the excitation of the feed 20. The first resonant mode is a fundamental mode of the inverted F-type antenna. The antenna radiator 10 between the feed point 13 and the first free end 11 is more likely to generate a third resonant mode supporting 1 / 4 wavelength of the third frequency band under the excitation of the feed 20. The third resonant mode is another fundamental mode of the inverted F-type antenna. Furthermore, since the electrical connection point 14 is located on the side of the feed point 13 away from the first free end 11, the sum of the length of the grounding member 40 and the length of the antenna radiator 10 between the electrical connection point 14 and the first free end 11 must be longer than the length of the antenna radiator 10 between the feed point 13 and the first free end 11. Therefore, the first frequency band supported by the first resonant mode is lower than the third frequency band supported by the third resonant mode, which is easier to implement and can reduce the design difficulty of the first tuning circuit 30.

[0061] Since the antenna radiator 10 between the second free end 12 and the first free end 11 forms a T-type antenna with the feed source 20, the first tuning circuit 30 and the second free end 12, the antenna radiator 10 between the second free end 12 and the first free end 11 is more likely to generate a second resonance mode of 1 / 2 wavelength supporting a second frequency band under the excitation of the feed source 20, and the second resonance mode is a basic mode of the T-type antenna. Since the length of the antenna radiator 10 between the second free end 12 and the first free end 11 is longer than the length of the antenna radiator 10 between the feed point 13 and the first free end 11, the second resonance mode supports a second frequency band lower than the third frequency band supported by the third resonance mode, which is easier to achieve and can reduce the design difficulty of the first tuning circuit 30.

[0062] Since the second resonance mode generated by the antenna radiator 10 between the first free end 11 and the second free end 12 under the excitation of the feed source 20 is a 1 / 2 wavelength mode, and the second resonance mode generated by the antenna radiator 10 between the ground 40, the electrical connection point 14 and the first free end 11 under the excitation of the feed source 20 is a 1 / 4 wavelength, the second resonance mode supports a second frequency band higher than the first frequency band supported by the first resonance mode, which can take into account the length design of the antenna radiator 10 and avoid the length of the antenna radiator 10 being too long.

[0063] In summary, by making the first resonance mode generated by the antenna radiator 10 between the ground 40, the electrical connection point 14 and the first free end 11 under the excitation of the feed source 20 support a relatively low first frequency band, making the second resonance mode generated by the antenna radiator 10 between the second free end 12 and the first free end 11 under the excitation of the feed source 20 support a relatively high second frequency band, and making the third resonance mode generated by the antenna radiator 10 between the feed point 13 and the first free end 11 under the excitation of the feed source 20 support a higher third frequency band, the length design of the antenna radiator 10 is taken into account, and the design difficulty of the first tuning circuit 30 is reduced. Of course, in other possible embodiments, the second frequency band can also be lower than the first frequency band.

[0064] In addition, by making the first resonance mode generated by the antenna radiator 10 between the ground 40, the electrical connection point 14 and the first free end 11 under the excitation of the feed source 20 support a relatively low first frequency band, making the second resonance mode generated by the antenna radiator 10 between the second free end 12 and the first free end 11 under the excitation of the feed source 20 support a relatively high second frequency band, and making the third resonance mode generated by the antenna radiator 10 between the feed point 13 and the first free end 11 under the excitation of the feed source 20 support a higher third frequency band, the impedance value of the antenna unit 100 can change more uniformly, so that the return loss curve (S11) of the antenna unit 100 changes more gently, which is more conducive to supporting continuous wide frequency.

[0065] Further, asFigure 8 As shown, the antenna radiator 10 between the ground 40 and the first free end 11 under the excitation of the feed 20 also generates a fourth resonant mode supporting a fourth frequency band. The fourth frequency band is between the first frequency band and the third frequency band. The fourth resonant mode includes a first resonant current generated by the antenna radiator 10 between the feed point 13 and the first free end 11, and a second resonant current generated by the antenna radiator 10 between the ground 40 and the feed point 13. The intensity of the second resonant current is weaker than that of the first resonant current.

[0066] By making the antenna radiator 10 between the ground 40 and the first free end 11 under the excitation of the feed 20 also generate the fourth resonant mode supporting the fourth frequency band, the antenna unit 100 can support the first frequency band, the second frequency band, the third frequency band and the fourth frequency band at the same time.

[0067] In a possible embodiment, the fourth frequency band can be between the first frequency band and the second frequency band. In another possible embodiment, the fourth frequency band can be between the second frequency band and the third frequency band.

[0068] Since the antenna radiator 10 between the ground 40 and the first free end 11 under the excitation of the feed 20 generates the fourth resonant mode supporting the fourth frequency band, and the length of the antenna radiator 10 between the ground 40 and the first free end 11 is longer than the length of the antenna radiator 10 between the feed point 13 and the first free end 11, the fourth resonant mode supporting the fourth frequency band is lower than the third resonant mode supporting the third frequency band, which is easier to implement and can reduce the design difficulty of the first tuning circuit 30.

[0069] In addition, since the first resonant mode and the third resonant mode are both 1 / 4 wavelength modes of the inverted-F antenna, but the electrical connection point 14 is located on the side of the feed point 13 away from the first free end 11, the length of the antenna radiator 10 between the ground 40 and the first free end 11 is greatly different from the length of the antenna radiator 10 between the feed point 13 and the first free end 11, which produces a large interval bandwidth between the first frequency band and the third frequency band. By locating the second frequency band between the first frequency band and the third frequency band, only when the bandwidth of the second frequency band is large enough, the first frequency band, the second frequency band and the third frequency band can form a continuous wideband. It is difficult for the T-shaped antenna to produce a second frequency band with a large bandwidth, so locating the fourth frequency band between the first frequency band and the third frequency band by the fourth resonant mode is beneficial to the antenna unit 100 supporting continuous multiple frequency bands, i.e. realizing wideband and ultrawideband. Of course, in other possible embodiments, the fourth frequency band can also be lower than the first frequency band.

[0070] As shown in FIG. 1, the antenna unit 100 includes a first tuning circuit 30, a second tuning circuit 40, a third tuning circuit 50, a fourth tuning circuit 60, a feed 20, an antenna radiator 10 and a ground 40. Figure 8 As shown in FIG. 1, the antenna unit 100 includes a first tuning circuit 30, a second tuning circuit 40, a third tuning circuit 50, a fourth tuning circuit 60, a feed 20, an antenna radiator 10 and a ground 40.Figure 8 The fourth resonance mode is illustrated by the dashed line. The fourth resonance mode includes the first resonance current generated by the antenna radiator 10 between the feeding point 13 and the first free end 11, and the second resonance current generated by the antenna radiator 10 between the grounding member 40 and the feeding point 13. The second resonance current has a current intensity weaker than that of the first resonance current. It can be understood that the first resonance current of the fourth resonance mode is the resonance current formed by superimposing the part of the resonance current on the antenna radiator 10 between the feeding point 13 and the first free end 11 in the first resonance mode and the part of the resonance current in the third resonance mode. The second resonance current of the fourth resonance mode includes the part of the resonance current on the grounding member 40 in the third resonance mode and the part of the resonance current on the antenna radiator 10 between the feeding point 13 and the grounding member 40 in the third resonance mode. In short, the fourth resonance mode can be understood as a mixed mode formed by the first resonance mode and the third resonance mode.

[0071] In a possible embodiment, the fourth frequency band is located between the first frequency band and the second frequency band. For example, the first frequency band, the fourth frequency band, and the second frequency band can all be low frequency bands (less than 1 GHz), and the first frequency band is lower than the fourth frequency band, and the fourth frequency band is lower than the second frequency band; or the first frequency band, the fourth frequency band, and the second frequency band can all be medium-high frequency bands, and the first frequency band is lower than the fourth frequency band, and the fourth frequency band is lower than the second frequency band; or the first frequency band can be a low frequency band, the fourth frequency band and the second frequency band can be medium-high frequency bands, and the fourth frequency band is lower than the second frequency band; or the first frequency band and the fourth frequency band can be medium-high frequency bands, and the first frequency band is lower than the fourth frequency band, and the second frequency band can be a high frequency band, and the like.

[0072] Since the path length of the resonance current of the fourth resonance mode is the same as that of the resonance current of the first resonance mode, the fourth frequency band located between the first frequency band and the second frequency band is easier to achieve and reduces the design difficulty of the first tuning unit compared with the fourth frequency band located between the second frequency band and the third frequency band.

[0073] The first, second, and fourth frequency bands can form a wideband. In one possible implementation, the S11 parameter of the first frequency band is less than -4dB, the S11 parameter of the second frequency band is less than -4dB, and the S11 parameter of the fourth frequency band is less than -4dB, thus forming a wideband of 0.5GHz to 2GHz. In other words, the bandwidth of antenna element 100 with an S11 parameter less than -4dB can reach 0.5GHz to 2GHz. Of course, in other possible implementations, the S11 parameter of the first frequency band is less than -3dB, the S11 parameter of the second frequency band is less than -3dB, and the S11 parameter of the fourth frequency band is less than -3dB, thus forming a wideband of 0.7GHz to 2.5GHz. In other words, the bandwidth of antenna element 100 with an S11 parameter less than -3dB can reach 0.7GHz to 2.5GHz.

[0074] In one possible embodiment, the first and second frequency bands are located in the mid-to-high frequency band. The third frequency band is located in the ultra-high frequency band. The fourth frequency band is located between the first and second frequency bands. By positioning the first and second frequency bands in the mid-to-high frequency band, the fourth frequency band between the first and second frequency bands, and the third frequency band in the ultra-high frequency band, the antenna element can support frequency bands covering the entire mid-to-high frequency band, and can also support the ultra-high frequency band.

[0075] In one possible embodiment, such as Figure 9 As shown, the sum of the length of the grounding component 40 and the length of the antenna radiator 10 between the electrical connection point 14 and the feed point 13 is greater than or equal to 1 / 16 of the wavelength of the first frequency band, and less than or equal to 3 / 16 of the wavelength of the first frequency band. The length of the grounding component 40 can be referenced in the appendix. Figure 9 As shown in L1. The length of the antenna radiator 10 between the electrical connection point 14 and the feed point 13 can be referred to in the appendix. Figure 9 As shown in L5. It is understood that the sum of the length of the grounding element 40 and the length of the antenna radiator 10 between the electrical connection point 14 and the feed point 13 can be greater than or equal to 1 / 4 of the overall length of the inverted-F antenna, and less than or equal to 3 / 4 of the overall length of the inverted-F antenna. For example, when the overall length of the inverted-F antenna is 30mm to 60mm, the sum of the length of the grounding element 40 and the length of the antenna radiator 10 between the electrical connection point 14 and the feed point 13, i.e., the sum of L1 and L5, can be 7.5mm to 45mm.

[0076] By ensuring that the sum of the length of the grounding element 40 and the length of the antenna radiator 10 between the electrical connection point 14 and the feed point 13 is greater than or equal to 1 / 16 of the wavelength of the first frequency band and less than or equal to 3 / 16 of the wavelength of the first frequency band, it is possible to achieve, without modification or with simple modification, the generation of a first resonant mode supporting the first frequency band by the grounding element 40, the antenna radiator 10 between the electrical connection point 14 and the first free end 11 under the excitation of the feed source 20; and to achieve the generation of a third resonant mode supporting the third frequency band by the antenna radiator 10 between the feed point 13 and the first free end 11 under the excitation of the feed source 20.

[0077] In one possible embodiment, such as Figure 10 As shown, the length of the antenna radiator 10 between the electrical connection point 14 and the second free end 12 is greater than or equal to 1 / 16 of the wavelength of the first frequency band. The length of the antenna radiator 10 between the electrical connection point 14 and the second free end 12 can be referenced in the appendix. Figure 10 As shown in L6. It is understood that the length of the antenna radiator 10 between the electrical connection point 14 and the second free end 12 can be greater than or equal to 1 / 4 of the overall length of the inverted F-type antenna. For example, when the overall length of the inverted F-type antenna is 30mm to 60mm, the length of the antenna radiator 10 between the electrical connection point 14 and the second free end 12 can be greater than or equal to 7.5mm; or, the length of the antenna radiator 10 between the electrical connection point 14 and the second free end 12 can be between 7.5mm and 15mm.

[0078] By making the length of the antenna radiator 10 between the electrical connection point 14 and the second free end 12 greater than or equal to 1 / 16 of the wavelength of the first frequency band, the antenna radiator 10 between the second free end 12 and the first free end 11 can generate a second resonant mode supporting the second frequency band under the excitation of the feed source 20 without modifying or simply modifying the first tuning circuit 30.

[0079] Optional, such as Figure 11 As shown, grounding component 40 is a grounding wire. One end of the grounding wire is electrically connected to electrical connection point 14, and the other end is electrically connected to reference ground 200. In the following embodiments, one end of the grounding wire is described as the first lead end 401, and the other end is described as the second lead end 402, which will not be repeated hereafter. It can be understood that the first lead end 401 is electrically connected to electrical connection point 14, and the second lead end 402 is electrically connected to reference ground 200. The first lead end 401 and electrical connection point 14 can be directly electrically connected or indirectly electrically connected. The second lead end 402 and reference ground 200 can be directly electrically connected or indirectly electrically connected.

[0080] This application does not specify the material or width of the grounding wire. For example, the grounding wire can be made of metal, alloy, etc. The width of the grounding wire can be less than or equal to the width of the antenna radiator 10. The grounding wire can be arranged parallel to the antenna radiator 10 or intersect with the antenna radiator 10. The following embodiment uses the example of the grounding wire being arranged parallel to the antenna radiator 10. The parallel arrangement of the grounding wire and the antenna radiator 10 is easier to implement in electronic devices 1000 such as mobile phones.

[0081] In this embodiment, the grounding element 40 is designed as a grounding wire. Since the grounding wire can be considered as a pure impedance element for alternating current and no parasitic parameters are introduced, the antenna unit 100 has higher radiation efficiency and achieves better broadband effect compared to the technical solution of grounding circuit with inductors and / or capacitors.

[0082] In one possible embodiment, such as Figure 12 As shown, Figure 12 for Figure 1 This is a schematic diagram of another structure of the antenna element 100 in the electronic device 1000 shown. The antenna radiator 10 includes a first radiating segment 101 and a second radiating segment 102 that are bent and connected. This application does not specifically limit the bending method between the first radiating segment 101 and the second radiating segment 102. For example, the first radiating segment 101 and the second radiating segment 102 can be bent at a right angle; or, the first radiating segment 101 and the second radiating segment 102 can be bent in an arc shape; or, the first radiating segment 101 and the second radiating segment 102 can be bent in an irregular shape, etc. In the following embodiment, the first radiating segment 101 and the second radiating segment 102 are bent at a right angle as an example. The end of the first radiating segment 101 away from the second radiating segment 102 forms the first free end 11. The end of the second radiating segment 102 away from the first radiating segment 101 forms the second free end 12.

[0083] like Figure 13 As shown, Figure 13The dashed line indicates the resonant current distribution of the second resonant mode of the antenna unit 100. By making the antenna radiator 10 include the first radiating section 101 and the second radiating section 102 connected by bending, the first free end 11 is formed at one end of the first radiating section 101 away from the second radiating section 102, and the second free end 12 is formed at one end of the second radiating section 102 away from the first radiating section 101, the second resonant mode of the antenna unit 100 can have the resonant current along the first radiating section 101 and the resonant current along the second radiating section 102, so that the second resonant mode of the antenna unit 100 can take into account the radiation in two orthogonal directions, and improve the radiation omnidirectionality of the second resonant mode of the antenna unit 100. In addition, the second resonant mode of the antenna unit 100 has the resonant current along the first radiating section 101 and the resonant current along the second radiating section 102, so that the resonant current distribution of the second resonant mode of the antenna unit 100 is more uniform, multiple specific absorption ratio (SAR) hot spots can be formed, and the SAR value of the second resonant mode can be reduced.

[0084] The electrical connection point 14 is located on the second radiating section 102. The feeding point 13 can be located on the first radiating section 101 or the second radiating section 102. In other words, the electrical connection point 14 and the feeding point 13 can be located on different radiating sections or the same radiating section. In the following embodiments, the electrical connection point 14 and the feeding point 13 are located on different radiating sections.

[0085] Please refer to Figure 14 and Figure 15 , Figure 14 The dashed line indicates the resonant current distribution of the first resonant mode of the antenna unit 100. Figure 15 The dashed line indicates the resonant current distribution of the fourth resonant mode of the antenna unit 100. The electrical connection point 14 located on the second radiating section 102 can increase the utilization rate of the antenna radiator 10 when forming an inverted F-type antenna, thereby facilitating the reduction of the length of the grounding member 40. In addition, the electrical connection point 14 located on the second radiating section 102 can make the first resonant mode and the fourth resonant mode of the antenna unit 100 have the resonant current along the first radiating section 101 and the resonant current along the second radiating section 102, so that the first resonant mode and the fourth resonant mode of the antenna unit 100 can take into account the radiation in two orthogonal directions, and improve the radiation omnidirectionality of the first resonant mode and the fourth resonant mode of the antenna unit 100. In addition, the first resonant mode and the fourth resonant mode of the antenna unit 100 have the resonant current along the first radiating section 101 and the resonant current along the second radiating section 102, so that the resonant current distribution of the first resonant mode and the fourth resonant mode of the antenna unit 100 is more uniform, multiple SAR hot spots can be formed, and the SAR value in a single direction can be reduced.

[0086] As shown in Figure 16 embodiments, the first edge 21 and the second edge 22 can be straightly bent; or, the first edge 21 and the second edge 22 can be arcuately bent; or, the first edge 21 and the second edge 22 can be irregularly bent, etc. In the following embodiments, the first edge 21 and the second edge 22 are straightly bent as an example. The connection between the first edge 21 and the second edge 22 forms a floor corner point 25.

[0087] In a possible implementation, the reference floor 200 can include the first edge 21, the second edge 22, the third edge 23 and the fourth edge 24 connected in sequence. The first edge 21 is oppositely arranged with the third edge 23. The second edge 22 is oppositely arranged with the fourth edge 24. In the embodiments of the present application, the first edge 21 and the third edge 23 are oppositely arranged along the Y-axis direction; and the second edge 22 and the fourth edge 24 are oppositely arranged along the X-axis direction. It can be understood that the first edge 21 and the third edge 23 are oppositely arranged along the width direction of the electronic device 1000. The second edge 22 and the fourth edge 24 are oppositely arranged along the length direction of the electronic device 1000. Of course, in other possible implementations, the first edge 21 and the third edge 23 can be oppositely arranged along the length direction of the electronic device 1000; and the second edge 22 and the fourth edge 24 can be oppositely arranged along the width direction of the electronic device 1000.

[0088] The first radiation section 101 is located on the side of the first edge 21 away from the center of the reference floor 200. It can be understood that the first radiation section 101 is located on the side of the first edge 21 away from the third edge 23. The first radiation section 101 and the reference floor 200 can have a clearance. The second radiation section 102 is located on the side of the second edge 22 away from the center of the reference floor 200. It can be understood that the second radiation section 102 is located on the side of the second edge 22 away from the fourth edge 24. The second radiation section 102 and the reference floor 200 can have a clearance.

[0089] The antenna radiator 10 is arranged at the corner of the reference floor 200 in this embodiment, which is beneficial for the antenna radiator 10 to excite the floor current along the first edge 21 and the floor current along the second edge 22 on the reference floor 200, so that the current distribution of the reference floor 200 is more uniform, and the radiation in two orthogonal directions can be considered; and the SAR value hot spot can be dispersed to reduce the SAR value of the electronic device 1000. In addition, arranging the antenna radiator 10 at the corner of the reference floor 200 enables the antenna radiator 10 to excite the floor current along the first edge 21 and the floor current along the second edge 22 on the reference floor 200, and also reduces the reverse current on the reference floor 200, thereby improving the radiation efficiency of the antenna unit 100.

[0090] As shown in FIG. 1, the antenna unit 100 excites the first floor current along the first edge 21 and the second floor current along the second edge 22 on the reference floor 200. Figure 17 As shown in FIG. 1, the antenna unit 100 excites the first floor current along the first edge 21 and the second floor current along the second edge 22 on the reference floor 200. Figure 17 The dashed line a in FIG. 1 schematically shows the first floor current along the first edge 21 excited by the antenna unit 100 on the reference floor 200. Figure 17 The dashed line b in FIG. 1 schematically shows the second floor current along the second edge 22 excited by the antenna unit 100 on the reference floor 200. It should be noted that the first floor current along the first edge 21 in this application can be a current parallel to the first edge 21, or a current close to parallel to the first edge 21. The second floor current along the second edge 22 can be a current parallel to the second edge 22, or a current close to parallel to the second edge 22. Of course, the antenna unit 100 can also excite a third floor current c close to the direction of the first floor current, a fourth floor current d close to the direction of the second floor current, and a fifth floor current e between the third floor current and the fourth floor current, etc. on the reference floor 200.

[0091] The antenna unit 100 excites the first floor current along the first edge 21 and the second floor current along the second edge 22 on the reference floor 200, which can be that the first resonance mode of the antenna unit 100 excites the first floor current along the first edge 21 and the second floor current along the second edge 22 on the reference floor 200; and / or, the second resonance mode of the antenna unit 100 excites the first floor current along the first edge 21 and the second floor current along the second edge 22 on the reference floor 200; and / or, the third resonance mode of the antenna unit 100 excites the first floor current along the first edge 21 and the second floor current along the second edge 22 on the reference floor 200; and / or, the fourth resonance mode of the antenna unit 100 excites the first floor current along the first edge 21 and the second floor current along the second edge 22 on the reference floor 200.

[0092] Since the antenna unit 100 excites the first floor current along the first edge 21 and the second floor current along the second edge 22 on the reference floor 200, the antenna unit 100 can take into account the radiation along the first edge 21 and the radiation along the second edge 22, that is, the radiation in two directions. In the embodiment of the present application, when the first edge 21 and the second edge 22 are bent at a right angle, the antenna unit 100 takes into account the radiation in two orthogonal directions, which is beneficial to realize omnidirectional coverage. In addition, the antenna unit 100 excites the first floor current along the first edge 21 and the second floor current along the second edge 22 on the reference floor 200, so that the radiation energy of the antenna unit 100 is dispersed on the circumferential side of the first edge 21 and the circumferential side of the second edge 22, and a plurality of SAR hot spots can be formed, which can reduce the SAR value in a single direction.

[0093] In a possible embodiment, the intensity of the first floor current is stronger than the intensity of the second floor current. For example, the intensity of the first floor current is stronger than the intensity of the second floor current, and the intensity of the third floor current is stronger than the intensity of the fourth floor current.

[0094] In the present application, the intensity of the first floor current being stronger than the intensity of the second floor current can include that the intensity of the first floor current in the first resonant mode is stronger than the intensity of the second floor current; and / or, the intensity of the first floor current in the second resonant mode is stronger than the intensity of the second floor current; and / or, the intensity of the first floor current in the third resonant mode is stronger than the intensity of the second floor current; and / or, the intensity of the first floor current in the fourth resonant mode is stronger than the intensity of the second floor current.

[0095] When the extension direction of the first edge 21 of the reference floor 200 is the same as or similar to the length direction of the electronic device 1000, the intensity of the first floor current is stronger than the intensity of the second floor current, which can increase the radiation energy of the antenna unit 100 in the length direction of the electronic device 1000. For the electronic device 1000 such as a mobile phone, the more the radiation energy in the length direction of the electronic device 1000, the more beneficial to improve the radiation efficiency of the electronic device 1000. When the extension direction of the first edge 21 of the reference floor 200 is the same as or similar to the width direction of the electronic device 1000, the intensity of the first floor current is stronger than the intensity of the second floor current, which can increase the radiation energy of the antenna unit 100 in the width direction of the electronic device 1000. For the electronic device 1000 such as a mobile phone, the more the radiation energy in the width direction of the electronic device 1000, the more beneficial to improve the hand holding performance of the electronic device 1000.

[0096] In a possible embodiment, as Figure 18As shown, the other end of the grounding member 40 is located on the side of the one end of the grounding member 40 close to the floor corner point 25. It can be understood that the second lead end 402 is located on the side of the first lead end 401 close to the floor corner point 25.

[0097] Since the second lead end 402 is electrically connected to the reference floor 200, the second lead end 402 is the grounding point of the first resonant mode of the inverted-F antenna in the present application, so that the second lead end 402 is located on the side of the first lead end 401 close to the floor corner point 25, which is beneficial to the first resonant mode of the antenna unit 100 to excite the first floor current along the first edge 21 and the second floor current along the second edge 22 on the reference floor 200, so that the first resonant mode of the antenna unit 100 can take into account the radiation in two orthogonal directions, improve the radiation omnidirectionality of the first resonant mode of the antenna unit 100, make the resonant current distribution of the first resonant mode of the antenna unit 100 more uniform, can form multiple SAR hot spots, and can reduce the SAR value of the first resonant mode.

[0098] In addition, since part of the resonant current of the fourth resonant mode also returns to the ground through the second lead end 402, the second lead end 402 is located on the side of the first lead end 401 close to the floor corner point 25, which is also beneficial to the fourth resonant mode of the antenna unit 100 to excite the first floor current along the first edge 21 and the second floor current along the second edge 22 on the reference floor 200, so that the fourth resonant mode of the antenna unit 100 can take into account the radiation in two orthogonal directions, improve the radiation omnidirectionality of the fourth resonant mode of the antenna unit 100, make the resonant current distribution of the fourth resonant mode of the antenna unit 100 more uniform, can form multiple SAR hot spots, and can reduce the SAR value of the fourth resonant mode.

[0099] Optionally, as shown in FIG. 6, the other end of the grounding member 40 is located on the side of the one end of the grounding member 40 close to the floor corner point 25. Figure 18 As shown, the distance between the projection point of the reference floor 200 and the floor corner point 25 of the other end of the grounding member 40 is less than or equal to 1 / 16 wavelength of the first frequency band. It can be understood that the distance between the projection point of the reference floor 200 and the floor corner point 25 of the second lead end 402 is less than or equal to 1 / 16 wavelength of the first frequency band. The distance between the projection point of the reference floor 200 and the floor corner point 25 of the second lead end 402 can be referred to FIG. 7 of the drawings. Figure 18 For example, when the first frequency band is a medium-high frequency band, the distance between the projection point of the reference floor 200 and the floor corner point 25 of the second lead end 402 can be less than or equal to 15 mm.

[0100] When the distance between the projection point of the second lead end 402 on the reference ground 200 and the ground corner point 25 is less than or equal to 1 / 16 of the wavelength of the first frequency band, the distance between the second lead end 402 and the ground corner point 25 is small. The current distribution excited by the first and fourth resonant modes of the antenna element 100 on the reference ground 200 can be referred to the appendix. Figure 17 As shown by the dashed line. The reference ground 200 has a first ground current along the first edge 21 and a third ground current in a direction similar to the first ground current, a second ground current along the second edge 22 and a fourth ground current in a direction similar to the second ground current, and a fifth ground current located between the third ground current and the fourth ground current. However, the maximum angle of the current distribution on the reference ground 200 is approximately the angle between the first ground current and the second ground current, which is close to 90°. Therefore, there are almost no currents in opposite directions that cancel each other out on the reference ground 200, thereby improving the radiation efficiency of the antenna element 100 in the first resonant mode and the fourth resonant mode, and improving the communication performance of the electronic device 1000 in the first frequency band and the fourth frequency band.

[0101] In one possible embodiment, such as Figure 19 As shown, the length of the first edge 21 is greater than the length of the second edge 22. The first edge 21 can correspond to a sub-border along the length direction of the electronic device 1000, and the second edge 22 can correspond to a sub-border along the width direction of the electronic device 1000; alternatively, the first edge 21 can correspond to a sub-border along the width direction of the electronic device 1000, and the second edge 22 can correspond to a sub-border along the length direction of the electronic device 1000. In this embodiment, the longer first edge 21 corresponds to a sub-border 300 along the length direction of the electronic device 1000, and the shorter second edge 22 corresponds to a sub-border 300 along the width direction of the electronic device 1000. For example, the first edge 21 corresponds to the first sub-border 31, meaning the extension direction of the first edge 21 is the same as or approximately the same as the extension direction of the first sub-border 31; the second edge 22 corresponds to the second sub-border 32, meaning the extension direction of the second edge 22 is the same as or approximately the same as the extension direction of the second sub-border 32.

[0102] When the length of the first edge 21 is greater than the length of the second edge 22, the path of the first floor current along the first edge 21 excited by the antenna unit 100 on the reference floor 200 is longer, so the intensity of the first floor current along the first edge 21 excited by the antenna unit 100 on the reference floor 200 can be stronger than the intensity of the second floor current along the second edge 22, when the first edge 21 is arranged along the long side of the electronic device 1000, it is beneficial to improve the radiation efficiency of the electronic device 1000; when the first edge 21 is arranged along the short side of the electronic device 1000, it is beneficial to improve the hand holding performance of the electronic device 1000.

[0103] As shown in Figure 20 The feeding point 13 is located in the first radiation section 101. In the embodiment, the feeding point 13 and the electrical connection point 14 are respectively located in the first radiation section 101 and the second radiation section 102, which can facilitate the layout of the feed source 20, the first tuning circuit 30, and the ground wire. Among them, the feed source 20, the first tuning circuit 30, and the ground piece 40 can be located in the space formed by the first radiation section 101 and the second radiation section 102. In other words, the feed source 20, the first tuning circuit 30, and the ground piece 40 are all located on the inner side of the antenna radiator 10. The feed source 20, the first tuning circuit 30, and the ground piece 40 are all located on the inner side of the antenna radiator 10, which is beneficial to arrange the antenna radiator 10 on the frame 300 or make the antenna radiator 10 close to the frame 300, thereby reducing the radiation energy loss of the antenna unit 100.

[0104] Figure 20 The dashed line schematically shows the resonant current distribution of the third resonant mode of the antenna unit 100. Since the feeding point 13 is located in the first radiation section 101, the resonant current of the third resonant mode of the antenna unit 100 is concentrated in the first radiation section 101 at this time. In addition, the feeding point 13 is electrically connected to the first tuning circuit 30, so the ground point of the third resonant mode of the antenna unit 100 is also located in the first radiation section 101, and the intensity of the first floor current along the first edge 21 excited by the antenna unit 100 on the reference floor 200 is enhanced. The third resonant mode of the antenna unit 100 can be concentrated in the length direction of the electronic device 1000 or the width direction of the electronic device 1000, so as to improve the radiation efficiency or the hand holding performance of the antenna unit 100 in the third resonant mode.

[0105] Furthermore, the feed point 13 is located in the first radiating section 101, at which point the resonant current of the fourth resonant mode of the antenna element 100 in the antenna radiator 10 is also concentrated in the first radiating section 101. The return point of part of the resonant current of the fourth resonant mode of the antenna element 100 is also located in the first radiating section 101, and the intensity of the first ground current excited along the first edge 21 on the reference ground plane 200 by the fourth resonant mode of the antenna element 100 is also enhanced. This allows the radiated energy of the fourth resonant mode of the antenna element 100 to be concentrated in the length direction or width direction of the electronic device 1000, which is beneficial for improving the radiation efficiency or anti-grip performance of the antenna element 100 in the fourth resonant mode.

[0106] Optionally, the distance between the projection point of the feed point 13 on the reference floor 200 and the floor corner point 25 is less than or equal to 1 / 16 of the wavelength of the first frequency band. The distance between the projection point of the feed point 13 on the reference floor 200 and the floor corner point 25 can be referred to the appendix. Figure 20 As shown in L8. For example, when the first frequency band is a mid-to-high frequency band, the distance between the projection point of the feed point 13 on the reference floor 200 and the floor corner point 25 can be less than or equal to 15mm.

[0107] When the distance between the projection point of the feed point 13 on the reference ground 200 and the corner point 25 of the ground is less than or equal to 1 / 16 of the wavelength of the first frequency band, the distance between the feed point 13 and the corner point 25 of the ground is relatively small. The current distribution excited by the antenna element 100 on the reference ground 200 in the third and fourth resonant modes can be referred to the appendix. Figure 17 As shown by the dashed line. The reference ground 200 has a first ground current along the first edge 21 and a third ground current in a direction similar to the first ground current, a second ground current along the second edge 22 and a fourth ground current in a direction similar to the second ground current, and a fifth ground current located between the third ground current and the fourth ground current. However, the maximum angle of the current distribution on the reference ground 200 is approximately the angle between the first ground current and the second ground current, which is close to 90°. Therefore, there are almost no currents in opposite directions that cancel each other out on the reference ground 200, thereby improving the radiation efficiency of the antenna element 100 in the third resonant mode and the fourth resonant mode, and improving the communication performance of the electronic device 1000 in the third frequency band and the fourth frequency band.

[0108] Furthermore, such as Figure 21As shown, the antenna unit 100 further comprises a second tuning circuit 50. The second tuning circuit 50 can comprise capacitances and / or inductances, etc. The present application does not make specific limitation on the number of capacitances and the number of inductances comprised by the second tuning circuit 50. When the second tuning circuit 50 comprises a plurality of capacitances, the plurality of capacitances can be connected in series or in parallel. When the second tuning circuit 50 comprises a plurality of inductances, the plurality of inductances can be connected in series or in parallel. When the second tuning circuit 50 comprises one or more capacitances and one or more inductances, the inductances and the capacitances can be connected in series or in parallel.

[0109] The second tuning circuit 50 is electrically connected between the other end of the grounding member 40 and the reference ground plate 200. It can be understood that the second tuning circuit 50 is electrically connected between the second lead end 402 and the reference ground plate 200. The electrical connection between the second tuning circuit 50 and the second lead end 402 can be direct or indirect. For example, the electrical connection between the second tuning circuit 50 and the second lead end 402 can be achieved by an electrically conductive wire, an electrically conductive post, an electrically conductive sheet, an electrically conductive probe, etc. The electrical connection between the second tuning circuit 50 and the reference ground plate 200 can be direct or indirect. For example, the electrical connection between the second tuning circuit 50 and the reference ground plate 200 can be achieved by an electrically conductive wire, an electrically conductive post, an electrically conductive sheet, an electrically conductive probe, etc.

[0110] The second tuning circuit 50 is used to adjust the impedance of the antenna unit 100 to achieve impedance matching of the antenna unit 100 in the first resonant mode and the fourth resonant mode. Since the return point of the first resonant mode of the antenna unit 100 is located at the second lead end 402, and the return point of the partial resonant current of the fourth resonant mode of the antenna unit 100 is also located at the second lead end 402, designing the second tuning circuit 50 between the second lead end 402 and the reference ground plate 200 can better achieve the impedance matching of the antenna unit 100 in the first resonant mode and the fourth resonant mode.

[0111] In a possible implementation, the impedance of the antenna unit 100 can be adjusted by the first tuning circuit 30 to achieve impedance matching of the antenna unit 100 in the second resonant mode and the third resonant mode, and the impedance of the antenna unit 100 can be adjusted by the second tuning circuit 50 to achieve impedance matching of the antenna unit 100 in the first resonant mode and the fourth resonant mode, so that the design difficulty of the first tuning circuit 30 and the second tuning circuit 50 can be reduced, and the impedance matching performance of the antenna unit 100 in the four modes can be easily ensured.

[0112] In a possible embodiment, as shown in FIG. 1, Figure 22 As shown, the reference ground plate 200, the feed source 20, the first tuning circuit 30, and the grounding member 40 can be located in a containing space formed by the bezel 300, and the antenna radiator 10 can be arranged on the bezel 300.

[0113] As Figure 23 shown, Figure 23 An echo loss and efficiency curve diagram of the electronic device 1000 provided by an embodiment of the present application. Figure 23 In the diagram, curve f is an echo loss curve of the electronic device 1000. Figure 23 Point 1 of curve f corresponds to a resonance frequency point of the first resonance mode, i.e., a center frequency point of the first frequency band. Figure 23 Point 2 of curve f corresponds to a resonance frequency point of the fourth resonance mode, i.e., a center frequency point of the fourth frequency band. Figure 23 Point 3 of curve f corresponds to a resonance frequency point of the second resonance mode, i.e., a center frequency point of the second frequency band. Figure 23 Point 4 of curve f corresponds to a resonance frequency point of the third resonance mode, i.e., a center frequency point of the third frequency band. Figure 23 Curve g is a free efficiency curve of the electronic device 1000. Figure 23 Curve h is a radiation efficiency curve of the electronic device 1000. In combination Figure 23 As can be seen from curve f, curve g and curve h, the first frequency band, the second frequency band and the fourth frequency band substantially cover all the medium-high frequency bands, the third frequency band covers the 3.47 GHz super-high frequency band, and the first frequency band, the second frequency band, the fourth frequency band and the third frequency band realize continuous super-wide frequency band.

[0114] As Figure 24 shown, Figure 24 An SAR value test diagram of the electronic device 1000 provided by an embodiment of the present application. Figure 24 The test result shows that when the electronic device 1000 works at 1.75 GHz, the top SAR value of the electronic device 1000 is about 0.49 W / kg, which is greatly reduced compared with the top SAR value 1.2 W / kg of the electronic device 1000 in the related art.

[0115] The features mentioned in the specification, claims and drawings of the present application can be combined with each other in any way within the scope of the present application.

[0116] Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limiting the present application, and those of ordinary skill in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application, and these improvements and refinements are also regarded as the protection scope of the present application.

Claims

1. An electronic device, characterized in that, include: Reference flooring; and An antenna unit includes an antenna radiator, a feed source, a first tuning circuit, and a grounding component. One end of the antenna radiator forms a first free end, and the other end of the antenna radiator forms a second free end. A feed point and an electrical connection point located on the side of the feed point away from the first free end are provided between the first free end and the second free end. The feed point is electrically connected to the feed source through the first tuning circuit. One end of the grounding component is electrically connected to the electrical connection point, and the other end of the grounding component is electrically connected to the reference ground. Specifically, the antenna radiator between the grounding element, the electrical connection point, and the first free end generates a first resonant mode supporting a first frequency band under the excitation of the feed source; the antenna radiator between the second free end and the first free end generates a second resonant mode supporting a second frequency band under the excitation of the feed source; and the antenna radiator between the feed point and the first free end generates a third resonant mode supporting a third frequency band under the excitation of the feed source.

2. The electronic device according to claim 1, characterized in that, The first frequency band is lower than the second frequency band, the second frequency band is lower than the third frequency band, the first resonant mode is a 1 / 4 wavelength mode, the second resonant mode is a 1 / 2 wavelength mode, and the third resonant mode is a 1 / 4 wavelength mode.

3. The electronic device according to claim 2, characterized in that, The grounding element, the antenna radiator between the electrical connection point and the first free end, under the excitation of the feed source, also generates a fourth resonant mode supporting a fourth frequency band. The fourth frequency band is located between the first frequency band and the third frequency band. The fourth resonant mode includes a first resonant current generated by the antenna radiator between the feed point and the first free end, and a second resonant current generated by the grounding element, the electrical connection point and the antenna radiator between the feed point, the intensity of the second resonant current being weaker than the intensity of the first resonant current.

4. The electronic device according to claim 3, characterized in that, The fourth frequency band is located between the first frequency band and the second frequency band, and the first frequency band, the second frequency band and the fourth frequency band form a wideband.

5. The electronic device according to any one of claims 1 to 4, characterized in that, The sum of the length of the grounding component and the length of the antenna radiator between the electrical connection point and the feed point is greater than or equal to 1 / 16 of the wavelength of the first frequency band, and less than or equal to 3 / 16 of the wavelength of the first frequency band. The length of the antenna radiator between the electrical connection point and the second free end is greater than or equal to 1 / 16 of the wavelength of the first frequency band.

6. The electronic device according to any one of claims 1 to 4, characterized in that, The grounding component is a grounding wire, one end of which is electrically connected to the electrical connection point, and the other end of which is electrically connected to the reference ground.

7. The electronic device according to any one of claims 1 to 4, characterized in that, The antenna radiator includes a first radiating segment and a second radiating segment that are bent and connected together. The end of the first radiating segment away from the second radiating segment forms the first free end, and the end of the second radiating segment away from the first radiating segment forms the second free end. The electrical connection point is located in the second radiating segment. The reference ground includes a first edge and a second edge that are bent and connected together. The connection between the first edge and the second edge forms a ground corner point. The first radiating segment is located on the side of the first edge away from the center of the reference ground, and the second radiating segment is located on the side of the second edge away from the center of the reference ground.

8. The electronic device according to claim 7, characterized in that, The antenna element excites a first ground current along the first edge and a second ground current along the second edge on the reference ground, wherein the intensity of the first ground current is stronger than the intensity of the second ground current.

9. The electronic device according to claim 7, characterized in that, The other end of the grounding element is located on the side of one end of the grounding element near the corner of the floor.

10. The electronic device according to claim 9, characterized in that, The distance between the other end of the grounding element and the projection point of the reference floor and the corner point of the floor is less than or equal to 1 / 16 of the wavelength of the first frequency band.

11. The electronic device according to claim 7, characterized in that, The length of the first edge is greater than the length of the second edge, and the feed point is located in the first radiating segment.

12. The electronic device according to claim 11, characterized in that, The distance between the projection point of the feed point on the reference floor and the corner point of the floor is less than or equal to 1 / 16 of the wavelength of the first frequency band.

13. The electronic device according to any one of claims 1 to 4, characterized in that, The first frequency band and the second frequency band are located in the mid-to-high frequency band, and the third frequency band is located in the ultra-high frequency band.

14. The electronic device according to claim 3 or 4, characterized in that, The antenna unit further includes a second tuning circuit, which is electrically connected between the other end of the grounding member and the reference ground. The second tuning circuit is used to adjust the impedance of the antenna unit to achieve impedance matching of the antenna unit in the first resonant mode and the fourth resonant mode.

15. The electronic device according to any one of claims 1 to 4, characterized in that, The electronic device also includes a frame that encloses a receiving space, in which the reference ground, the feed source, the first tuning circuit, and the grounding element are located, and the antenna radiator is disposed on the frame.

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