Electronic device

Abstract

The invention provides electronic equipment. The electronic equipment 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 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 feeding point and an electric connection point are arranged between the first free end and the second free end, and the electric connection point is arranged on the side, away from the first free end, of the feeding point. The feeding point is electrically connected with the feed source through the first tuning circuit, one end of the grounding piece is electrically connected with the electric connection point, and the other end of the grounding piece is electrically connected with the reference floor. The grounding piece, the electric connection point and the first free end generate a first resonance 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 equipment provided by the invention can realize multiple frequency bands and is flexible in structural design.

Description

Technical Field

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

[0002] In the related art, the multi-band and wide-band performance of the antenna is achieved by adding parasitic radiation branches. This technical solution has many requirements on the structural design of the antenna. Summary of the invention

[0003] The present application provides an electronic device capable of achieving multiple frequency bands and having a flexible structural design.

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

[0005] reference floor; and

[0006] An antenna unit, comprising an antenna radiator, a feed source, a first tuning circuit and a grounding member, wherein 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 feeding point and an electrical connection point arranged on a side of the feeding point away from the first free end are arranged between the first free end and the second free end, the feeding 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;

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

[0008] The electronic device provided by the present application includes a reference floor and an antenna unit, wherein the antenna unit includes an antenna radiator, a feed source, a first tuning circuit and a grounding member, wherein one end of the antenna radiator forms a first free end, the other end of the antenna radiator forms a second free end, and a feeding point and an electrical connection point located on a side of the feeding point away from the first free end are designed between the first free end and the second free end, so that the feeding 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, thereby enabling the feed source, the first tuning circuit, the antenna between the first free end and the second free end to be electrically connected to the reference floor. The radiator forms a "T-shaped antenna", which can make the feed source, the first tuning circuit, the grounding piece, 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 grounding piece, the electrical connection point and the first free end generates a first resonance mode under the excitation of the feed source, the antenna radiator between the second free end and the first free end generates a second resonance mode under the excitation of the feed source, and the antenna radiator between the feed point and the first free end generates a third resonance mode under the excitation of the feed source, thereby realizing the antenna unit's support for the first frequency band, the second frequency band and the third frequency band, which can broaden the communication frequency band of the electronic device. Since no parasitic radiation branches are added, but different types of antenna units are formed by adding grounding pieces and generating multiple resonance modes, the structural design of the antenna unit is simpler, more flexible, and more conducive to miniaturization. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments are briefly introduced below.

[0010] Figure 1 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application;

[0011] Figure 2 for Figure 1 A schematic diagram of the structure of an antenna unit in the electronic device shown;

[0012] Figure 3 for Figure 2 A schematic diagram showing a structure in which the grounding element of the antenna unit is replaced by a grounding circuit having components such as an inductor and / or a capacitor;

[0013] Figure 4 for Figure 2 A schematic diagram of the resonant current distribution of the first resonant mode of the antenna unit shown;

[0014] Figure 5 for Figure 2 A schematic diagram of the resonant current distribution of the second resonant mode of the antenna unit shown;

[0015] Figure 6 for Figure 2A schematic diagram of the resonant current distribution of the third resonant mode of the antenna unit shown;

[0016] Figure 7 for Figure 2 The antenna unit shown is a schematic diagram with several length parameters marked;

[0017] Figure 8 for Figure 2 A schematic diagram of the resonant current distribution of the fourth resonant mode of the antenna unit shown;

[0018] Fig. 9 for Figure 2 The antenna unit shown is a schematic diagram in which the length of the grounding piece and the length of the antenna radiator between the electrical connection point and the feeding point are marked;

[0019] Fig.10 for Figure 2 The antenna unit shown is a schematic diagram marking the length of the antenna radiator between the electrical connection point and the second free end;

[0020] Fig.11 for Figure 2 A schematic diagram of a structure in which the grounding member of the antenna unit is a grounding wire, a first lead end of the grounding wire is electrically connected to an electrical connection point of the antenna radiator, and a second lead end of the grounding wire is electrically connected to a reference ground;

[0021] Fig.12 for Figure 1 Another structural schematic diagram of an antenna unit in the electronic device shown;

[0022] Fig.13 for Fig.12 A schematic diagram of the resonant current distribution of the second resonant mode of the antenna unit shown;

[0023] Fig.14 for Fig.12 A schematic diagram of the resonant current distribution of the first resonant mode of the antenna unit shown;

[0024] Fig.15 for Fig.12 A schematic diagram of the resonant current distribution of the fourth resonant mode of the antenna unit shown;

[0025] Fig.16 for Fig.12 A schematic diagram showing a structure in which a reference floor of the electronic device includes a first edge and a second edge connected by a bend, a first radiating section of an antenna radiator is located on a side of the first edge away from the center of the reference floor, and a second radiating section is located on a side of the second edge away from the center of the reference floor;

[0026] Fig.17 for Fig.16 A schematic diagram of the distribution of the floor current excited on the reference floor of the electronic equipment shown;

[0027] Fig.18 for Fig.16 The electronic device shown is a schematic diagram of the distance between the projection point of the other end of the grounding piece on the reference floor and the corner point of the floor;

[0028] Fig.19 for Fig.18 A schematic structural diagram of the electronic device shown in which the length of the first edge of the reference floor is greater than the length of the second edge;

[0029] Fig. 20 for Fig.16 A schematic diagram of the resonant current distribution of the fourth resonant mode of the antenna unit shown;

[0030] Fig.21 for Fig.12 The antenna unit shown also includes a structural schematic diagram of a second tuning circuit;

[0031] Fig. 22 for Figure 1 A schematic diagram of the structure in which a reference floor, a feed source, a first tuning circuit and a grounding member of the electronic device are located in a containing space formed by a frame, and an antenna radiator is arranged on the frame;

[0032] Fig.23 A return loss and efficiency curve diagram of an electronic device provided in an embodiment of the present application;

[0033] Fig.24 A SAR value test chart of an electronic device provided in an embodiment of the present application.

[0034] Description of reference numerals:

[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 source 20; first tuning circuit 30; grounding piece 40; first free end 11; second free end 12; feeding 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 solution provided by the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the embodiments described in the present application are only a part of the embodiments, not all of the embodiments. Based on the embodiments described in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0037] References to "embodiments" and "implementations" in this application mean that the specific features, structures, or characteristics described in conjunction with the embodiments or implementations may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it mutually exclusive, independent, or alternative to other embodiments. It can be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0038] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish different objects rather than to describe a specific order; the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0039] like Figure 1 As shown, Figure 1 The schematic diagram of the structure of an electronic device 1000 provided in an embodiment of the present application. The electronic device 1000 may be a mobile phone, a tablet, a notebook, a watch, a drone, a robot, or other device with a wireless communication function. The present application embodiment takes a mobile phone as an example. The electronic device 1000 includes a reference floor 200 and an antenna unit 100.

[0040] The reference floor 200 refers to a portion of the electronic device 1000 that is not affected by any grounding configuration and is considered to be a conductive earth. The potential of the reference floor 200 is agreed to be zero. For example, the reference floor 200 may include a grounding layer of a main circuit board, a grounding layer of a secondary circuit board, a metal part of a middle frame, and a conductive part electrically connected to one or more of the grounding layer of the main circuit board, the grounding layer of the secondary circuit board, and the metal part of the middle frame in the electronic device 1000.

[0041] The middle frame includes a frame 300. The frame 300 is arranged to form an accommodating space. In a possible embodiment, the frame 300 may include a first sub-frame 31, a second sub-frame 32, a third sub-frame 33 and a fourth sub-frame 34 connected end to end. The first sub-frame 31 is arranged opposite to the third sub-frame 33. The second sub-frame 32 is arranged opposite to the fourth sub-frame 34. In the embodiment of the present application, the relative direction of the first sub-frame 31 and the third sub-frame 33 is defined as the width direction of the electronic device 1000, which can be referred to in the attached figure. Figure 1 The relative direction of the second sub-frame 32 and the fourth sub-frame 34 is defined as the length direction of the electronic device 1000, which can be referred to in the attached Figure 1The length of the first sub-frame 31 may be equal to the length of the third sub-frame 33, the length of the second sub-frame 32 may be equal to the length of the fourth sub-frame 34, and the length of the first sub-frame 31 and the length of the third sub-frame 33 may be greater than the length of the second sub-frame 32 and the length of the fourth sub-frame 34.

[0042] In the embodiment of the present application, 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 may also be the left side frame of the electronic device 1000, the second sub-frame 32 may also be the top frame of the electronic device 1000, the third sub-frame 33 may also be the right side frame of the electronic device 1000, and the fourth sub-frame 34 may also be the bottom frame of the electronic device 1000; or, the first sub-frame 31 may also be the right side frame of the electronic device 1000, the second sub-frame 32 may also be the bottom frame of the electronic device 1000, the third sub-frame 33 may also be the left side frame of the electronic device 1000, and the fourth sub-frame 34 may also be the bottom frame of the electronic device 1000. top frame; alternatively, the first sub-frame 31 may also be the left frame of the electronic device 1000, the second sub-frame 32 may also be the bottom frame of the electronic device 1000, the third sub-frame 33 may also be the right frame of the electronic device 1000, and the fourth sub-frame 34 may also be the top frame of the electronic device 1000; alternatively, the first sub-frame 31 may also be the right frame of the electronic device 1000, the second sub-frame 32 may also be the bottom frame of the electronic device 1000, the third sub-frame 33 may also be the left frame of the electronic device 1000, and the fourth sub-frame 34 may also be the top frame of the electronic device 1000.

[0043] like Figure 2 As shown, Figure 2 for Figure 1 The structure diagram of the antenna unit 100 in the electronic device 1000 is shown. The antenna unit 100 includes an antenna radiator 10, a feed source 20, a first tuning circuit 30 and a grounding member 40.

[0044] The antenna radiator 10 may be a frame antenna radiator 10 or a built-in antenna radiator 10. In other words, the antenna radiator 10 may be located on the frame 300 or in the accommodation space formed by the frame 300. The material of the antenna radiator 10 may 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" may be understood as an end that is not electrically connected to a conductive member or has a gap between it and the conductive member.

[0045] A feeding point 13 and an electrical connection point 14 disposed on a side of the feeding point 13 away from the first free end 11 are disposed between the first free end 11 and the second free end 12. The feeding point 13 can be understood as a specific position between the first free end 11 and the second free end 12. The electrical connection point 14 can be understood as a specific position between the first free end 11 and the second free end 12 and different from the feeding point 13. It can be understood that the feeding point 13 does not coincide with the first free end 11 and the second free end 12, that is, the feeding point 13 is not disposed at the first free end 11, and the feeding point 13 is not disposed at the second free end 12. The electrical connection point 14 does not coincide with the first free end 11 and the second free end 12, that is, the electrical connection point 14 is not disposed at the first free end 11, and the electrical connection point 14 is not disposed at the second free end 12. The feeding point 13 and the electrical connection point 14 are spaced apart. It can be understood that the first free end 11, the feeding point 13, the electrical connection point 14 and the second free end 12 are arranged in sequence.

[0046] The feed source 20 is electrically connected to the RF chip, and the feed source 20 can receive the RF current provided by the RF chip. The feed point 13 is electrically connected to the feed source 20 through the first tuning circuit 30. In other words, the first tuning circuit 30 is electrically connected between the feed point 13 and the feed source 20. Among them, the feed point 13 and the first tuning circuit 30 can be directly electrically connected or indirectly electrically connected. For example: the feed point 13 and the first tuning circuit 30 can be electrically connected through electrical connectors such as conductive wires, conductive columns, conductive sheets, and conductive probes. The first tuning circuit 30 and the feed source 20 can be directly electrically connected or indirectly electrically connected. For example: the first tuning circuit 30 and the feed source 20 can be electrically connected through electrical connectors such as conductive wires, conductive columns, conductive sheets, and conductive probes.

[0047] The grounding member 40 may be a grounding wire or a grounding circuit having components such as inductance and / or capacitance. One end of the grounding member 40 is electrically connected to the electrical connection point 14 , and the other end of the grounding member 40 is electrically connected to the reference ground 200 .

[0048] In a possible embodiment, Figure 2 As shown, the grounding member 40 is a grounding wire. One end of the grounding wire is electrically connected to the electrical connection point 14, and the other end of the grounding wire is electrically connected to the reference floor 200. The grounding wire and the electrical connection point 14 can be directly electrically connected or indirectly electrically connected. For example, the grounding wire and the electrical connection point 14 can be electrically connected through an electrically conductive wire, a conductive column, a conductive sheet, a conductive probe, or other electrically connected member. The grounding wire and the reference floor 200 can be directly electrically connected or indirectly electrically connected. For example, the grounding wire and the reference floor 200 can be electrically connected through an electrically conductive wire, a conductive column, a conductive sheet, a conductive probe, or other electrically connected member.

[0049] In another possible embodiment, Figure 3 As shown, the grounding member 40 is a grounding circuit having devices such as inductors and / or capacitors. The grounding circuit is electrically connected to the electrical connection point 14, and the grounding circuit is electrically connected to the reference floor 200. Among them, the grounding circuit and the electrical connection point 14 can be directly electrically connected or indirectly electrically connected. For example: the grounding circuit and the electrical connection point 14 can be electrically connected through electrical connectors such as conductive wires, conductive columns, conductive sheets, and conductive probes. The grounding circuit and the reference floor 200 can be directly electrically connected or indirectly electrically connected. For example: the grounding circuit and the reference floor 200 can be electrically connected through electrical connectors such as conductive wires, conductive columns, conductive sheets, and conductive probes. Among them, the design of the grounding 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 grounding circuit, while the other part of the resonant current cannot return to the ground through the electrical connection point 14 and the grounding circuit, which will be explained in the specific embodiments later.

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

[0051] like Figure 4 As shown in FIG. 1 , 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 grounding member 40 form an inverted F-type antenna. The first resonance mode generated by the grounding member 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 is as follows: Figure 4 The first resonant mode includes the resonant current from the other end of the grounding member 40 to the electrical connection point 14 and the resonant current from the electrical connection point 14 to the first free end 11. When the grounding member 40 is a grounding circuit having components such as an inductor and / or a capacitor, the design of the grounding circuit must ensure that the resonant current of the first resonant mode can return to the ground through the electrical connection point 14 and the grounding circuit.

[0052] like Figure 5 As shown, the feed source 20, the first tuning circuit 30, and the antenna radiator 10 between the first free end 11 and the second free end 12 form a T-shaped antenna. 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 is as shown in FIG. Figure 5The second resonance mode includes the resonance current from the first free end 11 to the second free end 12. When the grounding member 40 is a grounding circuit having components such as inductors and / or capacitors, the design of the grounding circuit must ensure that the resonance current of the second resonance mode cannot return to the ground through the electrical connection point 14 and the grounding circuit.

[0053] like Figure 6 As shown in FIG. 1 , 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 grounding member 40 form an inverted F-type antenna. 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 is shown in FIG. Figure 6 As shown by the dashed line in the middle. The third resonant mode includes a resonant current from the feeding point 13 to the first free end 11. Although the third resonant mode and the first resonant mode are both inverted F-type antenna modes, since the electrical length of the antenna radiator 10 corresponding to the resonant current of the first resonant mode is different from the electrical length of the antenna radiator 10 corresponding to the resonant current of the third resonant mode, the first resonant mode and the third resonant mode can support different first frequency bands and third frequency bands respectively.

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

[0055] The electronic device 1000 provided in the present application includes a reference floor 200 and an antenna unit 100, wherein the antenna unit 100 includes an antenna radiator 10, a feed source 20, a first tuning circuit 30 and a grounding member 40. By forming a first free end 11 at one end of the antenna radiator 10, forming a second free end 12 at the other end of the antenna radiator 10, and designing a feeding point 13 between the first free end 11 and the second free end 12 and designing an electrical connection point 14 located on a side of the feeding point 13 away from the first free end 11, the feeding point 13 is electrically connected to the feed source 20 through the first tuning circuit 30, one end of the grounding member 40 is electrically connected to the electrical connection point 14, and the other end of the grounding member 40 is electrically connected to the reference floor 200, so that the feed source 20, the first tuning circuit 30, the first free end 11 and the second free end 12 can be electrically connected. The antenna radiator 10 between the free ends 12 forms a T-shaped antenna, which can make the feed source 20, the first tuning circuit 30, the grounding member 40, and the antenna radiator 10 between the electrical connection point 14 and the first free end 11 form an inverted F-shaped antenna. In this way, the antenna radiator 10 between the grounding member 40, the electrical connection point 14 and the first free end 11 generates a first resonance mode 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 resonance mode under the excitation of the feed source 20, and the antenna radiator 10 between the feed point 13 and the first free end 11 generates a third resonance mode under the excitation of the feed source 20, thereby realizing the support of the antenna unit 100 for the first frequency band, the second frequency band and the third frequency band, and can broaden the communication frequency band of the electronic device 1000. Since no parasitic radiation branches are added, but different types of antenna units 100 are formed by adding a grounding member 40 and generating multiple resonance modes, the structural design of the antenna unit 100 is simpler and more flexible, and is more conducive to miniaturization.

[0056] Among them, 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 resonance mode is a 1 / 4 wavelength mode, the second resonance mode is a 1 / 2 wavelength mode, and the third resonance mode is a 1 / 4 wavelength mode.

[0057] It can be understood that 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 1 / 4 wavelength of the first frequency band. Figure 7 The length of the antenna radiator 10 between the electrical connection point 14 and the first free end 11 can be referred to in the attached Figure 7 L2 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 medium-high frequency band (1 GHz to 3 GHz), the overall length of the inverted F-type antenna can be 30 mm to 60 mm.

[0058] The length of the antenna radiator 10 between the first free end 11 and the second free end 12 is 1 / 2 wavelength of the second frequency band. Figure 7 L3 shown. 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 as the overall length of the T-type antenna in the following embodiments. For example; when the second frequency band is a medium-high frequency band, the overall length of the T-type antenna can be 30mm to 80mm. It should be noted that: this application does not limit the overall length of the T-type antenna to be longer than the overall length of the inverted F-type antenna, and the specific design needs to be based on the actual supported first frequency band and second frequency band. In other words, the overall length of the T-type antenna can be longer than the overall length of the inverted F-type antenna, and can also be shorter than the overall length of the inverted F-type antenna.

[0059] The length of the antenna radiator 10 between the feeding point 13 and the first free end 11 is 1 / 4 wavelength of the third frequency band. Figure 7 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 feeding point 13 and the first free end 11 may be 10 mm to 30 mm.

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

[0061] Since 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-shaped antenna, 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 the second frequency band under the excitation of the feed source 20, and the second resonance mode is a fundamental mode of the T-shaped 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 frequency band supported by the second resonance mode is lower than the third frequency band supported by the third resonance mode, which is easier to implement 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; the second resonance mode generated by the antenna radiator 10 between the grounding piece 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 frequency band supported by the second resonance mode is higher than the first frequency band supported by the first resonance mode, and the length design of the antenna radiator 10 can be taken into account to 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 grounding member 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 feeding 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 may 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 grounding piece 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 feeding 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 be made to 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 broadband.

[0065] Furthermore, if Figure 8 As shown, the antenna radiator 10 between the grounding member 40, the electrical connection point 14 and the first free end 11 also generates a fourth resonance mode supporting a fourth frequency band under the excitation of the feed source 20. The fourth frequency band is between the first frequency band and the third frequency band. The fourth resonance mode includes a first resonance current generated by the antenna radiator 10 between the feed point 13 and the first free end 11, and a second resonance current generated by the antenna radiator 10 between the grounding member 40, the electrical connection point 14 and the feed point 13. The intensity of the second resonance current is weaker than the intensity of the first resonance current.

[0066] By enabling the antenna radiator 10 between the grounding piece 40, the electrical connection point 14 and the first free end 11 to also generate a fourth resonant mode supporting the fourth frequency band under the excitation of the feed source 20, the antenna unit 100 can simultaneously support the first frequency band, the second frequency band, the third frequency band and the fourth frequency band.

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

[0068] Since the antenna radiator 10 between the grounding member 40, the electrical connection point 14 and the first free end 11 generates a fourth resonant mode supporting the fourth frequency band under the excitation of the feed source 20, and the length of the antenna radiator 10 between the grounding member 40, the electrical connection point 14 and the first free end 11 is longer than the length of the antenna radiator 10 between the feeding point 13 and the first free end 11, the fourth frequency band supported by the fourth 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.

[0069] In addition, since the first resonant mode and the third resonant mode are both 1 / 4 wavelength modes of the inverted F-type antenna, but the electrical connection point 14 is located on the side of the feeding point 13 away from the first free end 11, the length of the antenna radiator 10 between the grounding member 40, the electrical connection point 14 and the first free end 11 is greatly different from the length of the antenna radiator 10 between the feeding point 13 and the first free end 11, resulting in a large interval bandwidth between the first frequency band and the third frequency band. Only by making the second frequency band between the first frequency band and the third frequency band, the bandwidth of the second frequency band needs to be large, so that the first frequency band, the second frequency band and the third frequency band can form a continuous broadband. It is difficult for a T-type antenna to generate a second frequency band with a large bandwidth. Therefore, making the fourth frequency band supported by the fourth resonant mode between the first frequency band and the third frequency band is beneficial for the antenna unit 100 to support multiple continuous frequency bands, that is, to achieve broadband and ultra-wideband. Of course, in other possible embodiments, the fourth frequency band may also be lower than the first frequency band.

[0070] like Figure 8 As shown, Figure 8 The middle dotted line illustrates the resonant current distribution of the fourth resonant mode. Among them, the fourth resonant mode includes the first resonant current generated by the antenna radiator 10 between the feeding point 13 and the first free end 11; and the second resonant current generated by the antenna radiator 10 between the grounding piece 40 and the electrical connection point 14 and the feeding point 13. The current intensity of the second resonant current is weaker than the current intensity of the first resonant current. It can be understood that the first resonant current of the fourth resonant mode is a resonant current formed by superimposing part of the resonant current on the antenna radiator 10 between the feeding point 13 and the first free end 11 in the first resonant mode and part of the resonant current in the third resonant mode. The second resonant current of the fourth resonant mode includes part of the resonant current on the grounding piece 40 in the third resonant mode, and part of the resonant current on the antenna radiator 10 between the electrical connection point 14 and the feeding point 13 in the third resonant mode. In short, the fourth resonant mode can be understood as a mixed mode formed by the first resonant mode and the third resonant 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 and 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, and the fourth frequency band and the second frequency band can be medium and 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 and 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, etc.

[0072] Since the path length of the resonant current of the fourth resonant mode is the same as the path length of the resonant current of the first resonant mode, it is easier to make the fourth frequency band between the first frequency band and the second frequency band than to make the fourth frequency band between the second frequency band and the third frequency band, and it is easier to reduce the design difficulty of the first tuning unit.

[0073] Among them, the first frequency band, the second frequency band and the fourth frequency band can form a wide frequency band. 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. The first frequency band, the second frequency band and the fourth frequency band can form a wide frequency band of 0.5GHz to 2GHz. In other words, the bandwidth of the antenna unit 100 with the 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. The first frequency band, the second frequency band and the fourth frequency band can form a wide frequency band of 0.7GHz to 2.5GHz. In other words, the bandwidth of the antenna unit 100 with the S11 parameter less than -3dB can reach 0.7GHz to 2.5GHz.

[0074] In a possible embodiment, the first frequency band and the second frequency band are located in the medium and high frequency bands. The third frequency band is located in the ultra-high frequency band. The fourth frequency band is located between the first frequency band and the second frequency band. By making the first frequency band and the second frequency band located in the medium and high frequency bands, the fourth frequency band is located between the first frequency band and the second frequency band, and the third frequency band is located in the ultra-high frequency band, the frequency band supported by the antenna unit can cover all the medium and high frequency bands, and the antenna unit can support the ultra-high frequency band.

[0075] In a possible embodiment, Fig. 9 As shown, 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 feeding 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. Fig. 9 The length of the antenna radiator 10 between the electrical connection point 14 and the feeding point 13 can be referred to in the attached Fig. 9 As shown in L5. It can be understood that 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 feeding point 13 can be greater than or equal to 1 / 4 of the overall length of the inverted F-type antenna, and less than or equal to 3 / 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 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 feeding point 13, that is, the sum of L1 and L5 can be 7.5mm to 45mm.

[0076] By making the sum of the length of the grounding piece 40 and the length of the antenna radiator 10 between the electrical connection point 14 and the feeding point 13 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 making any improvements or simply making any improvements to the first tuning circuit 30, that the grounding piece 40, the antenna radiator 10 between the electrical connection point 14 and the first free end 11 generate a first resonant mode supporting the first frequency band under the excitation of the feed source 20; and that the antenna radiator 10 between the feeding point 13 and the first free end 11 generate a third resonant mode supporting the third frequency band under the excitation of the feed source 20.

[0077] In a possible embodiment, Fig.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 wavelength of the first frequency band. Fig.10 As shown in L6. It can be 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 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 improving or simply improving the first tuning circuit 30.

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

[0080] The present application does not specifically limit the material and width of the ground wire. For example, the material of the ground wire can be metal, alloy, etc. The width of the ground wire can be less than or equal to the width of the antenna radiator 10. The ground wire can be arranged in parallel with the antenna radiator 10, or it can be arranged to intersect with the antenna radiator 10. The following embodiments take the case where the ground wire is arranged in parallel with the antenna radiator 10 as an example. The ground wire is arranged in parallel with the antenna radiator 10, which is easier to implement in electronic devices 1000 such as mobile phones.

[0081] In this embodiment, the grounding member 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, compared with the technical solution in which the grounding member 40 is a grounding circuit with devices such as inductance and / or capacitance, the radiation efficiency of the antenna unit 100 is higher and the broadband effect is better.

[0082] In a possible embodiment, Fig.12 As shown, Fig.12 for Figure 1 Another structural schematic diagram of the antenna unit 100 in the electronic device 1000 shown. The antenna radiator 10 includes a first radiating section 101 and a second radiating section 102 connected by bending. The present application does not specifically limit the bending method between the first radiating section 101 and the second radiating section 102. For example: the first radiating section 101 and the second radiating section 102 can be bent at a right angle; or, the first radiating section 101 and the second radiating section 102 can be bent in an arc; or, the first radiating section 101 and the second radiating section 102 can be bent in an irregular shape, etc. In the following embodiments, the right-angle bend between the first radiating section 101 and the second radiating section 102 is taken as an example. The end of the first radiating section 101 away from the second radiating section 102 forms the first free end 11. The end of the second radiating section 102 away from the first radiating section 101 forms the second free end 12.

[0083] like Fig.13 As shown, Fig.13The middle dotted line illustrates the resonant current distribution of the second resonant mode of the antenna unit 100. By making the antenna radiator 10 include a first radiating section 101 and a second radiating section 102 connected in a bent manner, the end of the first radiating section 101 away from the second radiating section 102 forms the first free end 11, and the end of the second radiating section 102 away from the first radiating section 101 forms the second free end 12, so that the second resonant mode of the antenna unit 100 can have a resonant current along the first radiating section 101 and a 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 a resonant current along the first radiating section 101 and a 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, and multiple specific absorption ratio (SAR) hotspots can be formed, which can reduce the SAR value of the second resonant mode.

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

[0085] Please refer to Fig.14 and Fig.15 , Fig.14 The middle dashed line illustrates the resonant current distribution of the first resonant mode of the antenna unit 100 . Fig.15 The middle dotted line illustrates the resonant current distribution of the fourth resonant mode of the antenna unit 100. The electrical connection point 14 is located in the second radiation section 102, which 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 is located in the second radiation section 102, which can make the first resonant mode and the fourth resonant mode of the antenna unit 100 have a resonant current along the first radiation section 101 and a resonant current along the second radiation 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, thereby improving 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 a resonant current along the first radiation section 101 and a resonant current along the second radiation 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 hotspots can be formed, and the SAR value in a single direction can be reduced.

[0086] like Fig.16 As shown, the reference floor 200 includes a first edge 21 and a second edge 22 connected by a bend. The present application does not specifically limit the bending method between the first edge 21 and the second edge 22. For example: the first edge 21 and the second edge 22 can be bent at a right angle; or, the first edge 21 and the second edge 22 can be bent in an arc; or, the first edge 21 and the second edge 22 can be bent in an irregular shape, etc. The following embodiments take the right-angle bend between the first edge 21 and the second edge 22 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 may include a first edge 21, a second edge 22, a third edge 23, and a fourth edge 24 connected end to end in sequence. The first edge 21 and the third edge 23 are arranged opposite to each other. The second edge 22 and the fourth edge 24 are arranged opposite to each other. In the implementation of the present application, the first edge 21 and the third edge 23 are arranged opposite to each other along the Y-axis direction; the second edge 22 and the fourth edge 24 are arranged opposite to each other along the X-axis direction. It can be understood that the first edge 21 and the third edge 23 are arranged opposite to each other along the width direction of the electronic device 1000. The second edge 22 and the fourth edge 24 are arranged opposite to each other 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 arranged opposite to each other along the length direction of the electronic device 1000; the second edge 22 and the fourth edge 24 can be arranged opposite to each other along the width direction of the electronic device 1000.

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

[0089] In this embodiment, the antenna radiator 10 is arranged at the corner position of the reference floor 200, 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 taken into account; and it is beneficial to disperse the SAR value hotspot to reduce the SAR value of the electronic device 1000. In addition, the antenna radiator 10 is arranged at the corner position of the reference floor 200, so that the antenna radiator 10 can excite the floor current along the first edge 21 and the floor current along the second edge 22 on the reference floor 200, and can also reduce the reverse current on the reference floor 200, thereby improving the radiation efficiency of the antenna unit 100.

[0090] like Fig.17 As shown, the antenna unit 100 excites a first floor current along the first edge 21 and a second floor current along the second edge 22 on the reference floor 200 . Fig.17 The middle dashed line a indicates a first floor current along the first edge 21 excited by the antenna unit 100 on the reference floor 200 . Fig.17 The middle dotted line b indicates 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 the present application can be a current parallel to the first edge 21, or a current nearly 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 nearly parallel to the second edge 22. Of course, the antenna unit 100 can also excite a third floor current c on the reference floor 200 that is close to the direction of the first floor current, a fourth floor current d that is close to the direction of the second floor current, and a fifth floor current e that is located between the third floor current and the fourth floor current, etc.

[0091] The antenna unit 100 excites a first floor current along the first edge 21 and a second floor current along the second edge 22 on the reference floor 200. It may be that the first resonant 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 resonant 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 resonant 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 resonant 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, take into account 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 conducive to achieving 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 around the first edge 21 and the second edge 22, and multiple SAR hotspots 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 may include the intensity of the first floor current in the first resonance mode being stronger than the intensity of the second floor current; and / or the intensity of the first floor current in the second resonance mode being stronger than the intensity of the second floor current; and / or the intensity of the first floor current in the third resonance mode being stronger than the intensity of the second floor current; and / or the intensity of the first floor current in the fourth resonance mode being 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 electronic devices 1000 such as mobile phones, the more radiation energy along the length direction of the electronic device 1000, the more conducive to improving 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 electronic devices 1000 such as mobile phones, the more radiation energy along the width direction of the electronic device 1000, the more conducive to improving the hand-grip resistance performance of the electronic device 1000.

[0096] In a possible embodiment, Fig.18As shown, the other end of the grounding member 40 is located at 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 at 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 in the present application is the return point of the first resonant mode of the inverted F-type antenna. Therefore, 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 for 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 hotspots, 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 for 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 hotspots, and can reduce the SAR value of the fourth resonant mode.

[0099] Optional, such as Fig.18 As shown in FIG. 1 , the distance between the projection point of the other end of the grounding member 40 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. It can be understood that the distance between the projection point of the second lead end 402 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 second lead end 402 on the reference floor 200 and the floor corner point 25 can be referred to in the attached Fig.18 For example, when the first frequency band is a medium-high frequency band, the distance between the projection point of the second lead end 402 on the reference floor 200 and the floor corner point 25 may 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 floor 200 and the floor corner point 25 is less than or equal to 1 / 16 wavelength of the first frequency band, at this time, the distance between the second lead end 402 and the floor corner point 25 is small, and the current distribution excited by the first resonance mode and the fourth resonance mode of the antenna unit 100 on the reference floor 200 can refer to the attached Fig.17 The reference floor 200 has a first floor current along the first edge 21 and a third floor current close to the direction of the first floor current, a second floor current along the second edge 22 and a fourth floor current close to the direction of the second floor current, and a fifth floor current between the third floor current and the fourth floor current. However, the maximum angle of the current distribution on the reference floor 200 is approximately the angle between the first floor current and the second floor current, and the angle between the first floor current and the second floor current is close to 90°. Therefore, there are almost no currents on the reference floor 200 that are opposite in direction and cancel each other out, thereby improving the radiation efficiency of the antenna unit 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 a possible embodiment, Fig.19 As shown, the length of the first edge 21 is greater than the length of the second edge 22. The first edge 21 may correspond to the sub-frame setting in the length direction of the electronic device 1000, and the second edge 22 may correspond to the sub-frame setting in the width direction of the electronic device 1000; or, the first edge 21 may correspond to the sub-frame setting in the width direction of the electronic device 1000, and the second edge 22 may correspond to the sub-frame setting in the length direction of the electronic device 1000. In the embodiment of the present application, the first edge 21 with a longer length corresponds to the sub-frame 300 setting in the length direction of the electronic device 1000, and the second edge 22 with a shorter length corresponds to the sub-frame 300 setting in the width direction of the electronic device 1000. For example: the first edge 21 corresponds to the first sub-frame 31, that is, the extension direction of the first edge 21 is the same or substantially the same as the extension direction of the first sub-frame 31; the second edge 22 corresponds to the second sub-frame 32, that is, the extension direction of the second edge 22 is the same or substantially the same as the extension direction of the second sub-frame 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 that 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. At this time, when the first edge 21 is set along the long side of the electronic device 1000 such as a mobile phone, it is beneficial to improve the radiation efficiency of the electronic device 1000; when the first edge 21 is set along the short side of the electronic device 1000 such as a mobile phone, it is beneficial to improve the anti-hand-grip performance of the electronic device 1000.

[0103] like Fig. 20 As shown, the feed point 13 is located at the first radiation section 101. In this embodiment, the feed point 13 and the electrical connection point 14 are respectively located at 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 grounding wire. Among them, the feed source 20, the first tuning circuit 30, and the grounding member 40 can be located in the space enclosed 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 grounding member 40 are all located on the inner side of the antenna radiator 10. The feed source 20, the first tuning circuit 30, and the grounding member 40 are all located on the inner side of the antenna radiator 10, which is conducive to arranging the antenna radiator 10 on the frame 300, or arranging the antenna radiator 10 close to the frame 300, thereby reducing the radiation energy loss of the antenna unit 100.

[0104] Fig. 20 The middle dotted line illustrates 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 in the antenna radiator 10 is concentrated in the first radiation section 101. In addition, the feeding point 13 is electrically connected to the first tuning circuit 30, so the return point of the antenna unit 100 in the third resonant mode 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 third resonant mode of the antenna unit 100 on the reference floor 200 is enhanced. Thereby, the radiation energy of the third resonant mode of the antenna unit 100 can be concentratedly distributed 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 anti-hand-grip performance of the antenna unit 100 in the third resonant mode.

[0105] In addition, the feeding point 13 is located in the first radiation section 101, and the resonant current of the fourth resonance mode of the antenna unit 100 in the antenna radiator 10 is also concentrated in the first radiation section 101. The return point of part of the resonant current of the fourth resonance 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 fourth resonance mode of the antenna unit 100 on the reference floor 200 is also enhanced. As a result, the radiation energy of the fourth resonance mode of the antenna unit 100 can be concentratedly distributed 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 anti-hand-grip performance of the antenna unit 100 in the fourth resonance 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 wavelength of the first frequency band. Fig. 20 For example, when the first frequency band is a medium-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 may be less than or equal to 15 mm.

[0107] When 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 wavelength of the first frequency band, at this time, the distance between the feed point 13 and the floor corner point 25 is small, and the current distribution excited by the antenna unit 100 on the reference floor 200 in the third resonance mode and the fourth resonance mode can be referred to in the attached Fig.17 The reference floor 200 has a first floor current along the first edge 21 and a third floor current close to the direction of the first floor current, a second floor current along the second edge 22 and a fourth floor current close to the direction of the second floor current, and a fifth floor current between the third floor current and the fourth floor current. However, the maximum angle of the current distribution on the reference floor 200 is approximately the angle between the first floor current and the second floor current, and the angle between the first floor current and the second floor current is close to 90°. Therefore, there are almost no currents on the reference floor 200 that are opposite in direction and cancel each other out, thereby improving the radiation efficiency of the antenna unit 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, if Fig.21As shown, the antenna unit 100 also includes a second tuning circuit 50. The second tuning circuit 50 may include capacitors and / or inductors, etc. The present application does not specifically limit the number of capacitors and the number of inductors included in the second tuning circuit 50. When the second tuning circuit 50 includes multiple capacitors, the multiple capacitors may be connected in series or in parallel. When the second tuning circuit 50 includes multiple inductors, the multiple inductors may be connected in series or in parallel. When the second tuning circuit 50 includes one or more capacitors and one or more inductors, the inductors and capacitors may 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 floor 200. It can be understood that the second tuning circuit 50 is electrically connected between the second lead terminal 402 and the reference floor 200. The second tuning circuit 50 and the second lead terminal 402 can be electrically connected directly or indirectly. For example, the second tuning circuit 50 and the second lead terminal 402 can be electrically connected through electrical connectors such as conductive wires, conductive columns, conductive sheets, and conductive probes. The second tuning circuit 50 and the reference floor 200 can be electrically connected directly or indirectly. For example, the second tuning circuit 50 and the reference floor 200 can be electrically connected through electrical connectors such as conductive wires, conductive columns, conductive sheets, and conductive probes.

[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 part of the resonant current of the fourth resonant mode of the antenna unit 100 is also located at the second lead end 402, the second tuning circuit 50 is further designed between the second lead end 402 and the reference ground 200, so as to better achieve impedance matching of the antenna unit 100 in the first resonant mode and the fourth resonant mode.

[0111] In one 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; 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, thereby reducing the design difficulty of the first tuning circuit 30 and the second tuning circuit 50, and facilitating the impedance matching performance of the antenna unit 100 in the four modes.

[0112] In a possible embodiment, Fig. 22 As shown, the reference ground 200 , the feed source 20 , the first tuning circuit 30 and the grounding member 40 may be located in a containing space surrounded by a frame 300 , and the antenna radiator 10 may be disposed on the frame 300 .

[0113] like Fig.23 As shown, Fig.23 A return loss and efficiency curve diagram of the electronic device 1000 provided in an embodiment of the present application. Fig.23 The middle curve f is a return loss curve of the electronic device 1000 . Fig.23 Point 1 of the middle curve f corresponds to the resonant frequency of the first resonant mode, that is, the center frequency of the first frequency band. Fig.23 Point 2 of the middle curve f corresponds to the resonant frequency of the fourth resonant mode, that is, the center frequency of the fourth frequency band. Fig.23 The three points of the middle curve f correspond to the resonant frequency of the second resonant mode, that is, the center frequency of the second frequency band. Fig.23 The four points on the middle curve f correspond to the resonant frequency points of the third resonant mode, that is, the center frequency point of the third frequency band. Fig.23 The middle curve g is the free efficiency curve of the electronic device 1000 . Fig.23 The middle curve h is the radiation efficiency curve of the electronic device 1000. Fig.23 It can be seen from the middle curve f, curve g, and curve h that the first frequency band, the second frequency band, and the fourth frequency band basically cover all the medium and high frequency bands, and the third frequency band covers the ultra-high frequency band of 3.47GHz. The first frequency band, the second frequency band, the fourth frequency band, and the third frequency band realize a continuous ultra-wide bandwidth.

[0114] like Fig.24 As shown, Fig.24 A SAR value test chart of the electronic device 1000 provided in an embodiment of the present application. Fig.24 The test results show that when the electronic device 1000 operates at 1.75 GHz, the top SAR value of the electronic device 1000 is approximately 0.49 W / kg, which is significantly lower than the top SAR value of the electronic device 1000 of 1.2 W / kg in the related art.

[0115] The features mentioned above in the description, claims and drawings can be combined with each other in any way as long as they are meaningful within the scope of the present application.

[0116] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present application, and these improvements and modifications are also regarded as the scope of protection of the present application.

Claims

1. An electronic device, characterized in that: include: Reference floor; and An antenna unit, comprising an antenna radiator, a feed source, a first tuning circuit and a grounding member, wherein 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 feeding point and an electrical connection point arranged on a side of the feeding point away from the first free end are arranged between the first free end and the second free end, the feeding 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; Wherein, the antenna radiator between the grounding member, the electrical connection point and the first free end generates a first resonance 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 resonance mode supporting a second frequency band under the excitation of the feed source; and the antenna radiator between the feeding point and the first free end generates a third resonance 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 resonance mode is a 1 / 4 wavelength mode, the second resonance mode is a 1 / 2 wavelength mode, and the third resonance mode is a 1 / 4 wavelength mode.

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

5. The electronic device according to any one of claims 1 to 4, characterized in that: The sum of the length of the grounding member and the length of the antenna radiator between the electrical connection point and the feeding 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 member is a grounding wire, one end of the grounding wire is electrically connected to the electrical connection point, and the other end of the grounding wire 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 section and a second radiating section connected in a bent manner, an end of the first radiating section away from the second radiating section forms the first free end, an end of the second radiating section away from the first radiating section forms the second free end, the electrical connection point is located in the second radiating section, the reference floor includes a first edge and a second edge connected in a bent manner, a floor corner point is formed at the connection between the first edge and the second edge, the first radiating section is located on a side of the first edge away from the center of the reference floor, and the second radiating section is located on a side of the second edge away from the center of the reference floor.

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

9. The electronic device according to claim 7, characterized in that: The other end of the grounding piece is located at a side of one end of the grounding piece close to the corner point of the floor.

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

12. The electronic device according to claim 11, characterized in that: The distance between the projection point of the feeding point on the reference floor and the corner point of the floor is less than or equal to 1 / 16 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 medium and high frequency bands, and the third frequency band is located in the ultra-high frequency band.

14. The electronic device according to any one of claims 2 to 4, characterized in that: The antenna unit also includes a second tuning circuit, which is electrically connected between the other end of the grounding piece and the reference ground, and 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 further includes a frame, the frame is arranged to form a containing space, the reference floor, the feed source, the first tuning circuit and the grounding member are located in the containing space, and the antenna radiator is arranged on the frame.

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