Antenna and mobile terminal

Abstract

The embodiment of the present application provides an antenna and a mobile terminal, and relates to the technical field of wireless communication. The antenna is attached to a mounting part of the mobile terminal, and the antenna comprises a base body, a grounding layer and a radiator. The base body has a mounting surface and a setting surface which are opposite to each other; the grounding layer is arranged on the mounting surface in a laminated mode, and the grounding layer is attached to the mounting part through a glue; the radiator is arranged on the side of the grounding layer which is away from the base body, and the radiator comprises at least three branches with different extension lengths, and the at least three branches are used for forming resonance waves of different frequencies. The antenna and the mobile terminal provided by the embodiment of the present application improve the space utilization of the mobile terminal, optimize the branch length and width of the antenna, realize the resonance of multiple frequency bands, and can also reduce the interference caused by insufficient isolation between frequency bands.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wireless communication, and in particular to an antenna and a mobile terminal. BACKGROUND

[0002] With the popularity of 5G communication technology and the continuous improvement of mobile device performance, as a portable intelligent terminal device, the appearance design (such as ultra-thin, full screen) and communication performance (such as multi-frequency coverage, high-speed transmission) of the tablet computer need to meet the higher requirements of users.

[0003] In the related art, the antenna uses a flexible printed circuit board (FPC) as a substrate, and the antenna is attached to the inner wall of a metal support or a middle frame, and the feeding is realized by a contact spring plate and a main plate. This scheme relies on the metal frame as a radiator, and adjusts the branch length and matching circuit of the FPC to realize the resonance of specific frequency bands.

[0004] However, the above mobile device has low space utilization, and the branch length of the antenna is difficult to optimize, resulting in insufficient frequency band isolation and easy interference. SUMMARY

[0005] The embodiments of the present application provide an antenna and a mobile terminal to improve the space utilization of the mobile device, optimize the branch length and width of the antenna, realize multi-frequency resonance, and reduce interference caused by insufficient frequency band isolation.

[0006] In one aspect, the embodiments of the present application provide an antenna for attaching to a mounting member of a mobile terminal, the antenna comprising a base body, a ground layer and a radiator. The base body has an installation surface and a setting surface opposite to each other. The ground layer is stacked on the installation surface and attached to the mounting member by a glue. The radiator is arranged on the side of the base body away from the ground layer. The radiator comprises at least three branches with different extension lengths, and the at least three branches are used to form resonant waves of different frequencies.

[0007] In the above-mentioned antenna, it can be realized that the at least three branches include a first branch, a second branch and a third branch. The first branch is connected to one side of the second branch and extends along an arc in a direction away from the second branch. The third branch is connected to one side of the first branch and is located on the same side of the first branch as the second branch. The extension direction of the third branch is parallel to the extension direction of the second branch. The extension lengths of the first branch, the third branch and the second branch increase in turn.

[0008] In the above-mentioned antenna, it can be realized that the antenna further comprises a feeding point and a feeding site. The feeding point and the feeding site are arranged at the connection of the first branch and the third branch in the extension direction of the second branch. The feeding point is electrically connected to the radiator, and the feeding site is electrically connected to the ground layer and the radiator.

[0009] In the above antenna, it can be implemented that the first branch is connected to the feeding point for generating the resonant wave of the first frequency.

[0010] The second branch comprises a first sub-branch, a second sub-branch and a third sub-branch connected in sequence along the extending direction, and the first branch is connected to one side of the first sub-branch; the first branch is electromagnetically coupled to at least one of the first sub-branch, the second sub-branch and the third sub-branch for generating the resonant wave of the second frequency.

[0011] The third branch comprises a fourth sub-branch, a fifth sub-branch and a sixth sub-branch connected in sequence along the extending direction, and the fourth sub-branch is connected to the first branch; the feeding point and the feeding point are connected to at least one of the fourth sub-branch, the fifth sub-branch and the sixth sub-branch for generating the resonant wave of the third frequency.

[0012] The frequencies of the resonant wave of the first frequency, the resonant wave of the third frequency and the resonant wave of the second frequency decrease in sequence.

[0013] In the above antenna, it can be implemented that part of the side wall surface of the first branch is uneven.

[0014] In the above antenna, it can be implemented that along the direction from the first branch to the third branch, the width of the fourth sub-branch first increases and then decreases.

[0015] In the above antenna, it can be implemented that a limiting hole is arranged on the base body, and the limiting hole is used for cooperating with the limiting structure of the mounting member.

[0016] In the above antenna, it can be implemented that part of the setting surface of the base body is also attached with a wave-absorbing material.

[0017] In the above antenna, it can be implemented that the antenna further comprises an insulating layer, and the insulating layer is arranged on the side of the radiator away from the base body.

[0018] On the other hand, the embodiment of the present application provides a mobile terminal, comprising a mounting member, a matching circuit and the above antenna. Wherein, the mounting member is provided with a limiting structure; the antenna is attached to the mounting member, and the limiting hole of the antenna is limitedly matched with the limiting structure of the mounting member; the matching circuit is electrically connected with the antenna.

[0019] In the above mobile terminal, it can be implemented that the matching circuit comprises a plurality of electronic elements, and the plurality of electronic elements are connected in series and / or parallel to the feeding point of the antenna.

[0020] The antenna provided by the embodiment of the present application can effectively improve the space utilization by arranging the glue body on the mounting surface of the base and attaching the mounting member of the mobile terminal, realize the design of multi-band antenna structure in limited space, and improve the radiation efficiency and impedance matching of each frequency band; the radiating body arranged on the side of the base away from the ground layer includes at least three branches with different lengths, and the structure and length of the branch can be adjusted to realize independent resonance and collaborative coverage of multi-band and reduce the mutual interference between frequency bands. BRIEF DESCRIPTION OF DRAWINGS

[0021] The drawings incorporated in the specification and constituting a part thereof illustrate embodiments consistent with the present application and together with the specification are used to explain the principles of the present application.

[0022] Figure 1 A structure schematic view of the front of the antenna provided by the embodiment of the present application;

[0023] Figure 2 A structure schematic view of the back of the antenna provided by the embodiment of the present application;

[0024] Figure 3 An arrangement schematic view of the antenna provided by the embodiment of the present application during production;

[0025] Figure 4 A partial schematic view of the arrangement of the antenna provided by the embodiment of the present application during production;

[0026] Figure 5 An exploded view of the mobile terminal provided by the embodiment of the present application;

[0027] Figure 6 A schematic view of the matching circuit of the mobile terminal provided by the embodiment of the present application.

[0028] Explanation of reference signs:

[0029] 100, antenna; 110, first branch; 120, second branch; 121, first sub-branch; 122, second sub-branch; 123, third sub-branch; 130, third branch; 131, fourth sub-branch; 132, fifth sub-branch; 133, sixth sub-branch; 140, feeding point; 150, feeding point; 160, limiting hole; 200, mounting member; 210, support; 220, middle frame.

[0030] The above drawings have shown the specific embodiments of the present application, and the following will have more detailed description. These drawings and textual descriptions are not intended to limit the scope of the concept of the present application by any means, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0031] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0032] In the prior art, antennas use flexible printed circuit boards (FPCs) as the substrate and are attached to a metal bracket or the inner wall of the frame. Power is supplied by contacting the motherboard with a spring, resulting in low space utilization of the antenna. The antenna relies on the metal frame as the radiator and achieves resonance in a specific frequency band by adjusting the stub length of the FPC and the matching circuit. However, in a limited space, it is difficult to optimize the stub length, resulting in insufficient isolation between frequency bands and easy interference.

[0033] The antenna and mobile terminal provided in this application include an antenna comprising a substrate, a grounding layer, and a radiator. The substrate has opposing mounting surfaces and a mounting surface. The grounding layer is stacked on the mounting surface and attached to the mounting component via an adhesive. The radiator is disposed on the side of the substrate away from the grounding layer and includes at least three branches of unequal extension lengths, which are used to form resonant waves of different frequencies. By providing an adhesive on the mounting surface of the substrate and attaching it to the mounting component of the mobile terminal via the adhesive, space utilization can be effectively improved, enabling the design of a multi-band antenna structure within a limited space. Furthermore, the radiation efficiency and impedance matching of each frequency band can be improved. By providing a radiator on the side of the substrate away from the grounding layer, and the radiator including at least three branches of unequal extension lengths, adjusting the structure and length of the branches can achieve independent resonance and coordinated coverage of multiple frequency bands, reducing mutual interference between frequency bands.

[0034] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will be described below with reference to the accompanying drawings.

[0035] On the one hand, refer to Figure 1 and Figure 2 As shown in the figure, this application embodiment provides an antenna 100 for attachment to a mounting component 200 of a mobile terminal. The antenna 100 includes a substrate, a grounding layer, and a radiator. The substrate has a mounting surface and a placement surface facing opposite directions.

[0036] In the embodiment of the present application, the base body is a skeleton and an insulating carrier in the antenna 100, is a flexible insulating film, can effectively separate the ground layer from the radiator, and has an insulating property to prevent the branches of the radiator from short-circuiting with the ground layer. For example, the base body can be made of polyimide (PI) and has good flexibility, so that the antenna 100 can be bent and folded to be attached to an irregular curved surface such as the support 210 or the middle frame 220 of the mobile terminal, thereby improving the structural adaptability of the antenna 100.

[0037] The ground layer is laminated on the mounting surface and is attached to the mounting member 200 by the adhesive.

[0038] In the embodiment of the present application, the ground layer can also be referred to as a ground plane, which can be understood as a common reference point plane in the antenna 100 and provides a return path for high-frequency current to form a closed loop of current. In addition, the ground layer is located between the radiator of the antenna 100 and the complex circuit inside the terminal device and can also serve as an electromagnetic shielding layer to reduce the interference of the internal circuit on the received signal of the antenna 100 and prevent the antenna 100 from excessively radiating into the device. For example, the ground layer is a large-area and continuous metal conductor on one side of the mounting surface of the base body, specifically a copper foil.

[0039] The radiator is arranged on the side of the base body away from the ground layer, and the radiator includes at least three branches with different lengths, and the at least three branches are used to form resonant waves of different frequencies.

[0040] In the embodiment of the present application, the radiator is a core structure in the antenna 100 and is used to convert high-frequency current energy into electromagnetic waves or to convert spatial electromagnetic waves into high-frequency current energy, thereby realizing energy conversion between electricity and magnetism or between magnetism and electricity. The radiator is composed of branches, which can be understood as metal traces with specific lengths that constitute the radiator. For example, the radiator is a metal trace, specifically an electrolytic copper foil. The radiator includes at least three branches with different lengths and is used to form resonant waves of different frequencies to realize independent resonance of multiple frequency bands.

[0041] In the embodiment of the present application, the side of the ground layer of the antenna 100 away from the base body is provided with a glue body. Exemplarily, the glue body can be pressure-sensitive glue, specifically, acrylic foam glue, and the thickness thereof can be 40-60 μm, and the viscosity thereof can be ≥1700 gf / 25 mm, so that the antenna 100 is directly attached to the mounting member 200 of the terminal device, thereby effectively utilizing the space in the terminal device and increasing the clearance of the antenna 100. The clearance herein refers to the “clean” space above and on the side of the antenna 100 that needs to be reserved and is free of any metal components, including horizontal clearance and vertical clearance. When a metal component is close to the antenna 100, electromagnetic coupling is generated between the metal component and the antenna 100, which is equivalent to adding an extra capacitance or inductance to the antenna 100, thereby affecting the resonant frequency of the antenna 100 and reducing the radiation efficiency of the antenna 100. Therefore, the larger the clearance is, the better, so as to improve the radiation efficiency of the antenna 100. Exemplarily, in the embodiment of the present application, the clearance is 4.5-5.0 mm. In addition, a protective film is further provided on the glue body, and the thickness of the protective film can be 90-110 μm, and the grammage thereof can be 10-20 g, specifically, a transparent release film, which protects the viscosity of the glue body and is torn off before use.

[0042] Exemplarily, the size of the antenna 100 of the present application along the extension direction of the second branch 120 is a, and specifically, 48-50 mm, and the size thereof along the direction perpendicular to the extension direction of the second branch 120 is b, and specifically, 12-13 mm.

[0043] In summary, the antenna 100 of the embodiment of the present application is provided with a radiator on the side of the base body away from the ground layer, and the radiator includes at least three branches with different extension lengths. By adjusting the structure and length of the branches, independent resonance and collaborative coverage of multiple frequency bands can be achieved, and mutual interference between frequency bands is reduced. The antenna 100 is directly attached to the mounting member 200 of the mobile terminal device through the glue body, thereby effectively utilizing the space in the terminal device and increasing the clearance of the antenna 100, so that the antenna 100 can effectively radiate and receive signals and the radiation efficiency is improved.

[0044] As an implementable embodiment, the at least three branches include a first branch 110, a second branch 120 and a third branch 130; the first branch 110 is connected to one side of the second branch 120 and extends along an arc in a direction away from the second branch 120; the third branch 130 is connected to one side of the first branch 110 and is located on the same side of the second branch 120 as the first branch 110, and the extension direction of the third branch 130 is parallel to the extension direction of the second branch 120; the extension lengths of the first branch 110, the third branch 130 and the second branch 120 increase in turn.

[0045] In the embodiments of the present application, the extension direction of the branches can affect the vibration direction of the electromagnetic wave. For example, the antenna 100 can be installed at the four corners of the mobile terminal. It can be understood that there are three planes at the corner, namely one bottom plane and two side planes. The three branches can correspond to the three planes respectively. The first branch 110 extending along the arc can correspond to the side plane position at the corner, which can improve the fit with the mounting frame.

[0046] For example, the length of the branch determines the resonant frequency of the antenna 100. The longer the length, the lower the resonant frequency, and the shorter the length, the higher the resonant frequency. The extension lengths of the three branches are different, so that the antenna 100 can realize resonance at different frequencies.

[0047] As an implementable embodiment, continuing to refer to Figure 1 and Figure 2 As shown, the antenna 100 further includes a feeding point 140 and a feeding point 150. The feeding point 140 can be understood as a port for energy exchange, which is a physical connection point of the antenna 100 and an external radio frequency circuit, and can also serve as a reference point for impedance matching. The feeding point 140 is electrically connected to the radiator. When transmitting, it efficiently transmits the energy of the radio frequency signal to the antenna 100. When receiving, it efficiently transmits the signal of the antenna 100 to the radio frequency chip of the radio frequency circuit. The feeding point 150 is a point where the antenna 100 is connected to the reference ground potential, which is electrically connected to the ground layer and the radiator, provides a return path for the high-frequency current on the antenna 100, thereby forming a current loop, and also provides a reference benchmark for the potential of the antenna 100.

[0048] The positions of the feeding point 140 and the feeding point 150 can affect the resonance state and the input impedance. In the embodiments of the present application, the feeding point 140 and the feeding point 150 are arranged at intervals along the extension direction of the second branch 120 at the connection between the first branch 110 and the third branch 130. In this way, the input impedance of the antenna 100 can be further tuned to a predetermined impedance, impedance matching can be achieved, and energy transmission efficiency can be improved.

[0049] In the embodiments of the present application, the feeding point 140 and the feeding point 150 need to be plated with a nickel layer and a gold layer in sequence. The nickel layer can prevent the underlying copper layer from oxidizing to form copper oxide with poor conductivity, and the hard nickel layer can provide good support for the gold layer. Specifically, the thickness of the nickel layer can be 3-8 μm. The gold layer provides a stable and reliable contact surface for the electrical connection point, maintaining a stable contact resistance. Specifically, the thickness of the gold layer can be 0.05-0.1 μm.

[0050] As an implementable embodiment, the first branch 110 is connected to the feeding point 140 for generating a first frequency of resonant wave.

[0051] The second branch 120 includes a first sub-branch 121, a second sub-branch 122 and a third sub-branch 123 connected in sequence along the extension direction, and the first branch 110 is connected to one side of the first sub-branch 121; the first branch 110 is electromagnetically coupled with at least one of the first sub-branch 121, the second sub-branch 122 and the third sub-branch 123, for generating a resonant wave of the second frequency.

[0052] The third branch 130 includes a fourth sub-branch 131, a fifth sub-branch 132 and a sixth sub-branch 133 connected in sequence along the extension direction, and the fourth sub-branch 131 is connected with the first branch 110; the feeding point 140 and the feeding point 150 are connected with at least one of the fourth sub-branch 131, the fifth sub-branch 132 and the sixth sub-branch 133, for generating a resonant wave of the third frequency.

[0053] The frequencies of the resonant wave of the first frequency, the resonant wave of the third frequency and the resonant wave of the second frequency decrease in sequence.

[0054] In the embodiment of the present application, the first branch 110 is short in length, realizes the resonance of the high frequency band, specifically 2300-2700MHz, and the uneven structure further optimizes the resonance efficiency; the first branch 110 is electromagnetically coupled with the second branch 120 to form a multi-stage resonance structure, and the second branch 120 is long in length, realizes the resonance of the low frequency band, and the first sub-branch 121, the second sub-branch 122 and the third sub-branch 123 are connected in series to expand the coverage of the low frequency band, specifically 800-960MHz; the third branch 130 is directly connected with the feeding point 140 and the feeding point 150, and the fourth sub-branch 131 is designed to have a gradually increasing width to realize the resonance of the medium-high frequency band, specifically 1700-2200MHz. Through the synergistic effect of the three branches, independent resonance and collaborative coverage among frequency bands are realized, which can meet the communication requirements of 4G or 5G.

[0055] As an implementable embodiment, part of the side wall surface of the first branch 110 is uneven. In this way, longer branch paths can be accommodated in limited space, and micro distributed inductance and distributed capacitance can also be introduced, which can fine-tune the input impedance of the antenna 100.

[0056] As an implementable embodiment, along the direction of the first branch 110 to the third branch 130, the width of the fourth sub-branch 131 first increases and then decreases. By designing a gradually increasing width branch, wider frequency band coverage can be realized under the same physical length, the number of branches is reduced while the space utilization is improved, and impedance matching can also be optimized.

[0057] As an implementable embodiment, a limiting hole 160 is arranged on the base body, and the limiting hole 160 is used for cooperating with the limiting structure of the mounting member 200.

[0058] For example, there can be multiple limiting holes 160, and these multiple limiting holes 160 can be asymmetrical. The limiting holes 160 can be circular or square holes, cooperating with multiple limiting structures on the mounting component 200 to fix the position of the antenna 100 and avoid performance fluctuations caused by antenna 100 displacement. In this embodiment of the application, there are two limiting holes 160, and they are circular holes, such as... Figure 2 As shown, the distance between the two limiting holes 160 along the extension direction of the second branch 120 is c, which can be 23-27mm, and the distance along the extension direction perpendicular to the second branch 120 is d, which can be 0.8-1.2mm. The outer diameter of the limiting hole 160 is Φ, which can be 0.8-1.2mm.

[0059] As one feasible implementation method, a portion of the substrate's mounting surface is also covered with microwave absorbing material.

[0060] For example, the absorbing material can be a 0.1-0.3 mm nano-ferrite film covering the 700MHz-2700MHz frequency band. The absorption effect is enhanced by multi-layer stacking (up to 3 layers), which can also reduce interference from the metal mounting bracket antenna 100 signal. The absorbing material is precisely attached to the ends of the antenna 100 branches via laser cutting, which can reduce the intensity of interference signals from the metal mounting bracket 200 or the metal frame of the terminal equipment to the antenna 100, further improving the radiation efficiency of the antenna 100. It can also reduce the reflection of stray electromagnetic waves and enhance signal stability.

[0061] As one possible implementation, the antenna 100 also includes an insulating layer, which is stacked on the side of the radiator away from the substrate.

[0062] For example, the insulating layer is a flexible insulating film covering the branches of the radiator. Specifically, it can be a composite structure of polyimide film and adhesive, with a thickness of 26-29 μm. The insulating layer serves to prevent short circuits caused by contact between the branches and external metals, and also effectively prevents the branches from being worn or oxidized.

[0063] In other embodiments, when mass-producing antenna 100, reference is made to... Figure 3 As shown, multiple antennas 100 can be arranged in a two-dimensional array of rows and columns at intervals, wherein the extension direction of the second branch 120 of the antenna 100 is parallel to the row direction. For example, see reference... Figure 4As shown in the drawings, among the plurality of antennas 100 arranged along rows and columns, the antennas 100 located along the odd rows and the antennas 100 located along the even rows are centrally symmetrical along the column direction. Among the antennas 100 arranged along two adjacent rows and two adjacent columns, the side wall surface of the first branch 110 of the antenna 100 located in the odd column and the even row is opposite to the side wall surface of the first branch 110 of the antenna 100 located in the even column and the odd row along the row direction, so that a plurality of antennas 100 with good performance and mutual independence can be prepared in a limited space.

[0064] On the other hand, referring to Figure 5 As shown in the drawings, the embodiment of the present application provides a mobile terminal, which comprises a mounting member 200, a matching circuit and the above-mentioned antenna 100. The mounting member 200 is provided with a limiting structure; the antenna 100 is attached to the mounting member 200, and the limiting hole 160 of the antenna 100 is limitedly matched with the limiting structure of the mounting member 200; and the matching circuit is electrically connected with the antenna 100.

[0065] It can be understood that, since the antenna 100 of the embodiment of the present application adopts the technical solutions of the above-mentioned antenna 100 embodiments, it at least has the beneficial effects brought by the technical solutions of the above-mentioned antenna 100 embodiments, which will not be repeated here.

[0066] Exemplarily, the mobile terminal can be a tablet or a mobile phone, etc. In the embodiment of the present application, the mobile terminal is a tablet. The mounting member 200 is a support 210 or a middle frame 220 of the mobile terminal device, which is used for mounting the core components in the mobile terminal device as the main load-bearing structure of the mobile terminal device. The antenna 100 is attached to the support 210 or the middle frame 220 by a colloid.

[0067] In the embodiment of the present application, the mobile terminal device further comprises a matching circuit, which can be understood as an impedance transformer and is connected with a radio frequency chip. When the output impedance of the radio frequency chip does not match the input impedance of the antenna 100, the signal energy will be reflected and not transmitted to the antenna 100. Therefore, the matching circuit is provided to realize impedance matching and improve the energy transmission efficiency; and it can also reduce the high-power reflected wave, thereby protecting the radio frequency chip in the radio frequency circuit.

[0068] As an implementable embodiment, the matching circuit comprises a plurality of electronic elements, which are connected in series and / or in parallel to the feed point 140 of the antenna 100. Exemplarily, referring to Figure 6 As shown in the drawings, the plurality of electronic elements of the matching circuit can include B, C, D, E, F, G, etc., which can be capacitors, inductors, antenna 100 switches or antenna 100 tuners, etc. Different combinations can be selected according to the actual design, which will not be limited here. By adjusting the series or parallel mode of each device, the impedance matching is optimized, and the frequency band interference is further avoided.

[0069] It has to be noted that the terms "first", "second", etc. are used herein merely to distinguish one entity or action from another entity or action, without necessarily requiring or implying any actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0070] Finally, it should be understood that various changes and modifications to the embodiments described herein will be apparent to those skilled in the art. Such changes and modifications can be made only within the scope of the present application and without departing from the true spirit of the application and the scope of equivalents thereof, and it is therefore intended to cover all such changes and modifications. The scope of the application should, therefore, be determined not with reference to the above description, but instead with reference to the appended claims along with their full scope of equivalents.

Claims

1. An antenna, characterized by The antenna (100) is attached to a mounting member (200) of a mobile terminal, and comprises: a base body having a mounting surface and a setting surface; a ground layer laminated on the mounting surface and attached to the mounting member (200) by a glue; a radiation body provided on a side of the base body away from the ground layer, the radiation body comprising at least three branches of different lengths for forming resonance waves of different frequencies; the at least three branches comprise a first branch (110), a second branch (120) and a third branch (130); the first branch (110) is connected to one side of the second branch (120) and extends along an arc away from the second branch (120); the third branch (130) is connected to one side of the first branch (110) and is located on the same side of the second branch (120) as the first branch (110), and the extending direction of the third branch (130) is parallel to the extending direction of the second branch (120); the antenna (100) further comprises a feeding point (140) and a feeding point (150), the third branch (130) comprises a fourth sub-branch (131), a fifth sub-branch (132) and a sixth sub-branch (133) connected in sequence along the extending direction, and the fourth sub-branch (131) is connected to the first branch (110); the feeding point (140) and the feeding point (150) are connected to at least one of the fourth sub-branch (131), the fifth sub-branch (132) and the sixth sub-branch (133) for generating a third frequency resonance wave; part of the side wall surface of the first branch (110) is uneven.

2. The antenna according to claim 1, characterized in that, The extending lengths of the first branch (110), the third branch (130) and the second branch (120) increase in sequence.

3. The antenna of claim 2, wherein, The feeding point (140) and the feeding point (150) are spaced apart from each other at the connection between the first branch (110) and the third branch (130) along the extending direction of the second branch (120); the feeding point (140) is electrically connected to the radiation body, and the feeding point (150) is electrically connected to the ground layer and the radiation body.

4. The antenna according to claim 3, characterized in that The first branch (110) is connected to the feeding point (140) for generating a first frequency resonance wave; the second branch (120) comprises a first sub-branch (121), a second sub-branch (122) and a third sub-branch (123) connected in sequence along the extending direction, and the first branch (110) is connected to one side of the first sub-branch (121); the first branch (110) is electromagnetically coupled to at least one of the first sub-branch (121), the second sub-branch (122) and the third sub-branch (123) for generating a second frequency resonance wave; the frequencies of the first frequency resonance wave, the third frequency resonance wave and the second frequency resonance wave decrease in sequence.

5. The antenna according to claim 4, characterized in that, The width of the fourth sub-branch (131) increases first and then decreases along the direction from the first branch (110) to the third branch (130).

6. The antenna according to any one of claims 1-5, wherein, The base body is provided with a limiting hole (160) for cooperating with a limiting structure of the mounting member (200).

7. The antenna according to any one of claims 1-5, wherein, Part of the setting surface of the base body is also attached with a wave-absorbing material.

8. The antenna according to any one of claims 1-5, wherein, The antenna (100) further comprises an insulating layer which is arranged in a stack on the side of the radiator away from the base body.

9. A mobile terminal, characterized by Comprise: A mounting member (200) provided with a limiting structure; The antenna (100) according to any one of claims 1-8, which is attached to the mounting member (200), and the limiting hole (160) of the antenna (100) is in limiting cooperation with the limiting structure of the mounting member (200); A matching circuit electrically connected with the antenna (100).

10. The mobile terminal of claim 9, wherein, The matching circuit comprises a plurality of electronic elements connected in series and / or in parallel to the feed point (140) of the antenna (100).

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