Antenna and terminal device

Abstract

The invention provides an antenna and terminal equipment, and relates to the field of communication. The antenna comprises a first radiator, a second radiator and a third radiator, the first radiator comprises a first branch knot, a second branch knot and a third branch knot, and the second branch knot and the third branch knot are located on the two opposite sides of the first branch knot and connected with the two ends of the first branch knot respectively; the second radiator and the third radiator are located on the two opposite sides of the first branch knot respectively and are spaced from the first branch knot. The structure of the three radiators of the antenna enables the antenna to have wide bandwidth and high radiation efficiency, the three radiators are integrally arranged, the overall size of the antenna can be reduced, and the antenna can be conveniently arranged in a mainboard of the terminal equipment.

Description

Technical Field

[0001] The present disclosure relates to the field of communications, and in particular to an antenna and a terminal device. Background Art

[0002] With the rapid development of wireless communication technology, 5G (The 5th Generation Mobile Communication Technology) networks have been widely used in the field of mobile communications, greatly improving the communication rate of terminal devices.

[0003] In the related art, in order to stabilize the communication network of the terminal device, multiple antennas need to be processed on the metal middle frame of the terminal device. However, setting the antenna on the metal middle frame requires processing multiple gaps and arranging the wiring area around the antenna. The antenna structure will occupy the space for arranging the screen, causing a "black border" to appear on the screen of the terminal device, affecting the display effect of the screen. Summary of the invention

[0004] In view of this, the present disclosure provides an antenna and a terminal device, and the antenna can be set on a mainboard of the terminal device.

[0005] Specifically, the following technical solutions are included:

[0006] In a first aspect, an antenna is provided, comprising a first radiator, a second radiator and a third radiator, wherein the first radiator comprises a first branch, a second branch and a third branch, wherein the second branch and the third branch are located at opposite sides of the first branch and are respectively connected to two ends of the first branch;

[0007] The second radiator and the third radiator are respectively located on two opposite sides of the first branch and are spaced apart from the first branch.

[0008] Optionally, the second radiator and the third radiator are arranged in a collinear manner and are perpendicular to the first branch.

[0009] Optionally, the second branch and the third branch are parallel to each other and perpendicular to the first branch.

[0010] Optionally, the first radiator is a centrosymmetric structure.

[0011] Optionally, opposite sides of the first branch have a first groove and a second groove respectively, the first groove is opposite to an end of the second radiator, and the second groove is opposite to an end of the third radiator.

[0012] Optionally, the width of the first groove is equal to the width of the second groove, the width of the second radiator is equal to the width of the third radiator, and the width of the second radiator is greater than the width of the first groove.

[0013] Optionally, the antenna also includes a feeding port, a first ground port and a second ground port, the feeding port is connected to the center of the first branch, the first ground port is connected to an end of the second radiator close to the first branch, and the second ground port is connected to an end of the third radiator close to the first branch.

[0014] Optionally, the antenna further includes a dielectric plate and a coupling plate, the dielectric plate has a first surface and a second surface opposite to each other, the first radiator, the second radiator and the third radiator are located on the first surface, and the coupling plate is located on the second surface.

[0015] Optionally, a first protrusion and a second protrusion are provided on the first surface of the medium plate, and the first protrusion and the second protrusion are respectively located in the first groove and the second groove.

[0016] Optionally, a geometric center of an orthographic projection of the first radiator on the first surface coincides with a geometric center of the first surface, and an edge of the dielectric plate coincides with an edge of the coupling plate.

[0017] Optionally, the dielectric plate and the coupling plate are square, and the side length of the square is 9.5-10.5 mm.

[0018] Optionally, the distance between the second radiator and the first branch is 0.45-0.55 mm, and the distance between the third radiator and the first branch is 0.45-0.55 mm.

[0019] Optionally, the length of the first branch is 7.5-8.5 mm, the length of the second branch and the third branch is 3.7-4.3 mm, and the width of the first branch, the second branch and the third branch is 1.8-2.2 mm.

[0020] On the other hand, a terminal device is provided, which includes a mainboard and the above-mentioned antenna, wherein the mainboard is located in a shell of the terminal device and close to a corner of the terminal device, and the antenna is electrically connected to the mainboard.

[0021] The beneficial effects of the technical solution provided by the embodiments of the present disclosure include at least:

[0022] The antenna provided by the embodiment of the present disclosure includes a first radiator, a second radiator and a third radiator, wherein the second radiator and the third radiator are arranged at intervals from the first radiator to form a main radiator and a parasitic branch in the three radiators, and the structure of the three radiators enables the antenna to have a wider bandwidth and higher radiation efficiency. The integrated arrangement of the three radiators is conducive to reducing the size of the entire antenna and facilitating the arrangement of the antenna in the mainboard of the terminal device. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 A schematic diagram of an antenna provided in an embodiment of the present disclosure;

[0025] Figure 2 A front view of an antenna provided in an embodiment of the present disclosure;

[0026] Figure 3 A side view of an antenna provided for an embodiment of the present disclosure;

[0027] Figure 4 An S-parameter curve diagram of the antenna provided in the embodiment of the present disclosure;

[0028] Figure 5 A simulation efficiency curve diagram of the antenna provided in the embodiment of the present disclosure;

[0029] Figure 6 A schematic diagram of an electronic device provided in accordance with an embodiment of the present disclosure.

[0030] The reference numerals in the figures represent respectively:

[0031] 1-first radiator; 11-first branch; 12-second branch; 13-third branch; 111-feeding port; 112-first groove; 113-second groove; m1-width of the first groove; m2-width of the second groove; n2-width of the second radiator; n3-width of the third radiator;

[0032] 2-second radiator; 21-first ground port; 3-third radiator; 31-second ground port; L0-side length of the square; L1-length of the first branch; L2-length of the second branch; d1-width of the second branch; 4-dielectric plate; 41-first protrusion; 42-second protrusion; 5-coupling plate.

[0033] The above drawings show clear embodiments of the present disclosure, which will be described in more detail below. These drawings and text descriptions are not intended to limit the scope of the present disclosure in any way, but to illustrate the concepts of the present disclosure to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0034] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices consistent with some aspects of the present disclosure as detailed in the appended claims.

[0035] Figure 1 Schematic diagram of an antenna provided by an embodiment of the present disclosure. Figure 1 As shown, the antenna provided by the embodiment of the present disclosure includes a first radiator 1, a second radiator 2 and a third radiator 3. The first radiator 1 includes a first branch 11, a second branch 12 and a third branch 13, and the second branch 12 and the third branch 13 are located on opposite sides of the first branch 11 and are respectively connected to two ends of the first branch 11. The second radiator 2 and the third radiator 3 are respectively located on opposite sides of the first branch 11 and are spaced apart from the first branch 11.

[0036] The antenna provided by the embodiment of the present disclosure includes a first radiator 1, a second radiator 2 and a third radiator 3, wherein the second radiator 2 and the third radiator 3 are arranged at intervals from the first radiator 1, one of the three radiators is used as a main radiator, and the other two radiators are used as parasitic branches. The structure of the three radiators enables the antenna to have a wider bandwidth and higher radiation efficiency. The integrated arrangement of the three radiators of the antenna is conducive to reducing the overall size of the antenna and facilitating the arrangement of the antenna in the mainboard of the terminal device.

[0037] In order to make the technical solutions and advantages of the present disclosure more clear, the embodiments of the present disclosure will be further described in detail below with reference to the accompanying drawings.

[0038] like Figure 1 As shown, the antenna provided by the embodiment of the present disclosure includes a first radiator 1, a second radiator 2 and a third radiator 3, and the first radiator 1, the second radiator 2 and the third radiator 3 are located on the same plane. The first radiator 1 includes a first branch 11, a second branch 12 and a third branch 13, the first branch 11 has two opposite ends, the second branch 12 is connected to one end of the first branch 11, and the third branch 13 is connected to the other end of the first branch. The second radiator 2 and the third radiator 3 are located on opposite sides of the first branch 11 and are spaced apart from the first radiator 1.

[0039] Exemplarily, the first radiator 1 is used to connect to the feeder, and the second radiator 2 and the third radiator 3 are used to connect to the ground terminal. When the antenna is working, current is distributed in the first radiator 1, and the second radiator 2 and the third radiator 3 are coupled with the first radiator 1 to become parasitic branches of the antenna and adjust the signal waveform of the antenna. The first radiator 1, the second radiator 2 and the third radiator 3 can all radiate signals, so that the antenna has a higher radiation efficiency.

[0040] In some embodiments of the present disclosure, Figure 1 As shown, the first branch 11 has a first groove 112 and a second groove 113 on opposite sides, respectively. The first groove 112 is opposite to the end of the second radiator 2, and the second groove 113 is opposite to the end of the third radiator 3. The first groove 112 is used to increase the distance between the second radiator 2 and the first branch 11, and the second groove 113 is used to increase or decrease the distance between the third radiator 3 and the first branch 11, so as to adjust the coupling degree between the first radiator 1, the second radiator 2 and the third radiator 3, thereby adjusting the waveform of the signal radiated by the first radiator 1, the second radiator 2 and the third radiator 3.

[0041] In some embodiments of the present disclosure, Figure 1 As shown, the antenna also includes a feeding port 111, a first grounding port 21 and a second grounding port 31. The feeding port 111 is connected to the center of the first branch 11, the first grounding port 21 is connected to an end of the second radiator 2 close to the first branch 11, and the second grounding port 31 is connected to an end of the third radiator 3 close to the first branch 11.

[0042] Exemplarily, the feeding port 111, the first grounding port 21 and the second grounding port 31 are all regular quadrangular prisms, and the feeding port 111, the first grounding port 21 and the second grounding port 31 have the same size. One end of the feeding port 111, the first grounding port 21 and the second grounding port 31 are respectively connected to the first branch 11, the second radiator 2 and the third radiator 3, and the extension direction of the feeding port 111, the first grounding port 21 and the second grounding port 31 is perpendicular to the plane where the first radiator 1 is located. Among them, the other end of the feeding port 111 is used to connect to the feeding interface, and the first grounding port 21 and the second grounding port 31 are used to connect to the grounding point. The feeding port 111, the first grounding port 21 and the second grounding port 31 are used to connect to the mainboard of the terminal device. Exemplarily, the connection form of the feeding port 111, the first grounding port 21 and the second grounding port 31 to the mainboard can be a DIP (dual in-line package) dual in-line plug-in type, or a BTB connector (board-to-board connectors) type.

[0043] Alternatively, if Figure 1 As shown, the antenna further includes a dielectric plate 4 and a coupling plate 5, the dielectric plate 4 has a first surface and a second surface opposite to each other, the first radiator 1, the second radiator 2 and the third radiator 3 are located on the first surface, and the coupling plate 5 is located on the second surface. The coupling plate 5 is used to couple with the first radiator 1, the second radiator 2 and the third radiator 3, so as to adjust the signal radiated by the antenna.

[0044] It should be noted that, in the antenna provided in the embodiment of the present disclosure, the first radiator 1, the second radiator 2, the third radiator 3, the coupling plate 5, the feeding port 111, the first grounding port 21 and the second grounding port 31 are all made of copper material, and its conductivity is 4×10 7 S / m. The dielectric plate 4 is made of polybutylene terephthalate (PBT plastic), with a relative dielectric constant of 3.15 and a loss tangent of 0.001. The first radiator 1, the second radiator 2, the third radiator 3 and the coupling plate 5 are plated on the first and second surfaces of the dielectric plate 4 by LDS (Laser Direct Structuring) process.

[0045] In some embodiments of the present disclosure, Figure 1 As shown, the first surface of the dielectric plate 4 is provided with a first protrusion 41 and a second protrusion 42, and the first protrusion 41 and the second protrusion 42 are respectively located in the first groove 112 and the second groove 113. The shapes of the first protrusion 41 and the second protrusion 42 are respectively adapted to the shapes of the first groove 112 and the second groove 113, and the height of the first protrusion 41 and the second protrusion 42 is the same as the thickness of the first radiator 1, so that the first radiator 1 is fixed on the dielectric plate 4.

[0046] Figure 2 A front view of an antenna provided by an embodiment of the present disclosure. In some embodiments of the present disclosure, such as Figure 2 As shown, the second radiator 2 and the third radiator 3 are arranged in a collinear manner and are perpendicular to the first branch 11. The first branch 11, the second radiator 2 and the third radiator 3 are all rectangular, the sizes of the second radiator 2 and the third radiator 3 are equal, the centers of the first branch 11, the second radiator 2 and the third radiator 3 are located on the same straight line, and the distance between the second radiator 2 and the center of the first branch 11 is equal to the distance between the center of the third radiator 3 and the center of the first branch 11.

[0047] In some embodiments of the present disclosure, Figure 2As shown, the second branch 12 and the third branch 13 are parallel to each other and perpendicular to the first branch 11. The second branch 12 extends in a direction away from the third radiator 3, and the third branch 13 extends in a direction away from the second radiator 2. The second branch 12 and the third branch 13 are parallel to each other, so that the first radiator 1 forms a dipole antenna structure, which is beneficial to broaden the bandwidth of the antenna in the 5G frequency band.

[0048] Alternatively, see Figure 2 The first radiator 1 is a centrosymmetric structure. The second branch 12 and the third branch 13 have the same size, so that the two branches of the dipole antenna can ensure that the two radiation frequency bands have the same.

[0049] In some embodiments of the present disclosure, Figure 2 As shown, the width m1 of the first groove 112 is equal to the width m2 of the second groove 113, the width n2 of the second radiator 2 is equal to the width n3 of the third radiator 3, and the width n2 of the second radiator 2 is greater than the width m1 of the first groove 112. Specifically, the width m1 of the first groove 112 is 1.2-1.7 mm, and the width n2 of the second radiator 2 is 0.9-1.1 mm.

[0050] Alternatively, if Figure 2 As shown, the geometric center of the orthographic projection of the first radiator 1 on the first surface coincides with the geometric center of the first surface, and the edge of the dielectric plate 4 coincides with the edge of the coupling plate 5 .

[0051] Alternatively, if Figure 2 As shown, the dielectric plate 4 and the coupling plate 5 are square, and the side length L0 of the square is 9.5-10.5 mm. The projection of the center of the first branch 11 on the first surface coincides with the center of the dielectric plate 4, and the end of the second branch 12 and the end of the third branch 13 coincide with the edge of the dielectric plate 4. The distance d0 between the edge of the second branch 12 away from the third branch 13 and the edge of the dielectric plate 4 is 0.9-1.1 mm, and the distance d0 between the edge of the third branch 13 away from the second branch 12 and the edge of the dielectric plate 4 is 0.9-1.1 mm.

[0052] Alternatively, if Figure 2 As shown, the distance d2 between the second radiator 2 and the first branch 11 is 0.45-0.55 mm, and the distance d3 between the third radiator 3 and the first branch 11 is 0.45-0.55 mm. The distance d2 between the second radiator 2 and the first branch 11 is equal to the distance d3 between the third radiator 3 and the first branch 11, both of which are 0.45-0.55 mm. The depth of the first groove 112 and the second groove 113 is equal, which is half of the distance d2 between the second radiator 2 and the first branch 11, that is, 0.225-0.275 mm.

[0053] Alternatively, if Figure 2 As shown, the width d5 ​​of the second radiator 2 and the third radiator 3 are both 0.9-1.1 mm.

[0054] Alternatively, if Figure 2 As shown, the projections of the feeding port 111, the first ground port 21, and the second ground port 31 on the first surface are in the shape of a square, and the side length d4 of the square is 0.45-0.55 mm. The projection edges of the first ground port 21 and the second ground port 31 coincide with the end edges of the second radiator 2 and the third radiator 3 close to the first branch 11, respectively. Preferably, the distance d2 between the side length d4 of the square and the first branch 11 is equal to the distance d3 between the third radiator 3 and the first branch 11.

[0055] In some embodiments of the present disclosure, Figure 2 As shown, the length L1 of the first branch 11 is 7.5-8.5 mm, the length L2 of the second branch 12 and the third branch 13 is 3.7-4.3 mm, and the width d1 of the first branch 11, the second branch 12 and the third branch 13 is 1.8-2.2 mm. The length L2 of the second branch 12 and the third branch 13 plus the width d1 of the first branch 11 is about 5.5-6.5 mm, which is about one-fourth of the wavelength corresponding to the 5G frequency band of the signal radiated by the antenna.

[0056] Figure 3 A side view of an antenna provided in an embodiment of the present disclosure. In some embodiments of the present disclosure, such as Figure 3 As shown, the length h1 of the feeding port 111, the first ground port 21 and the second ground port 31 is 1.8-2.2 mm, the thickness h2 of the first radiator 1, the second radiator 2 and the third radiator 3 is 0.18-0.22 mm, the thickness h3 of the dielectric plate 4 is 0.55-0.65 mm, and the thickness of the coupling plate 5 is equal to the thickness h2 of the first radiator 1, the second radiator 2 and the third radiator 3.

[0057] Preferably, in the antenna provided by the embodiment of the present disclosure, the width m1 of the first groove 112 and the second groove 113 is 1.5 mm, the width n2 of the second radiator 2 and the third radiator 3 is 1 mm, the side length L0 of the dielectric plate 4 and the coupling plate 5 is 10 mm, the length L1 of the first branch 11 is 8 mm, the length L2 of the second branch 12 and the third branch 13 is 4 mm, the distance between the edge of the third branch 13 away from the second branch 12 and the edge of the dielectric plate 4 and the distance d0 between the edge of the second branch 12 away from the third branch 13 and the edge of the dielectric plate 4 are 1 mm, the widths of the first branch 11, the second branch 12 and the third branch 13 are 1 mm, and the widths of the first branch 11, the second branch 12 and the third branch 13 are 1 mm. The depth d1 is 2 mm, the distance d2 between the second radiator 2 and the first branch 11 is 0.5 mm, the depth of the first groove 112 and the second groove 113 is 0.25 mm, the side length d4 of the projection of the feeding port 111, the first ground port 21 and the second ground port 31 on the first surface is 0.5 mm, the width d5 ​​of the second radiator 2 and the third radiator 3 are both 1 mm, the length h1 of the feeding port 111, the first ground port 21 and the second ground port 31 is 2 mm, the thickness h2 of the first radiator 1, the second radiator 2, the third radiator 3 and the coupling plate 5 is 0.2 mm, and the thickness h3 of the dielectric plate 4 is 0.6 mm.

[0058] Figure 4 The S parameter curve of the antenna provided in the embodiment of the present disclosure is the same as that of the above preferred embodiment. Figure 4 , the curve is a curve showing the variation of the radiation efficiency of the antenna provided by the embodiment of the present disclosure with the frequency. In the frequency band of 5.15 GHz to 5.875 GHz, the antenna provided by the embodiment of the present disclosure can achieve a return loss of less than -4 dB, and the overall bandwidth range of the antenna is relatively wide.

[0059] Figure 5 The simulated efficiency curve of the antenna provided in the embodiment of the present disclosure is the same as that of the above-mentioned preferred embodiment. Figure 5 As shown, in the 5.15 GHz to 5.875 GHz frequency band, the antenna effect is higher than -5 dB, and the overall antenna efficiency is around -3 dB.

[0060] On the other hand, the present disclosure also provides a terminal device, Figure 6 Schematic diagram of an electronic device provided by an embodiment of the present disclosure. Figure 6 As shown, the terminal device provided in the embodiment of the present disclosure includes a mainboard 6 and an antenna 7. The mainboard 6 is located in the housing of the terminal device and is close to the corner of the terminal device. The antenna 7 is the antenna in any of the above embodiments and is electrically connected to the mainboard 6. The terminal device can be, but is not limited to, a mobile phone, a tablet computer, or a laptop computer. The terminal device may also be called a user device, a portable terminal, a laptop terminal, or other names.

[0061] In the terminal device, the antenna 7 includes a first radiator 1, a second radiator 2 and a third radiator 3. The second radiator 2 and the third radiator 3 are arranged at intervals from the first radiator 1 to form a main radiator and a parasitic branch in the three radiators. The structure of the three radiators enables the antenna to have a wider bandwidth and higher radiation efficiency. The integrated arrangement of the three radiators is conducive to reducing the overall size of the antenna and facilitating the arrangement of the antenna in the mainboard 6 of the terminal device. The present application realizes the integration of a smaller-sized antenna on the mainboard of the terminal device, without the need to arrange the antenna on the frame of the terminal device. The structure of the terminal device is more compact, which is conducive to reducing the space occupied by the antenna and reducing the production cost of the antenna.

[0062] It should be noted that the "several" and "at least one" mentioned in this article refer to one or more, and "multiple" and "at least two" refer to two or more. "And / or" describes the association relationship of the associated objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects before and after are in an "or" relationship.

[0063] In the description of the present disclosure, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0064] In the present disclosure, unless otherwise expressly specified and limited, a first feature being “above” or “below” a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being “above”, “above”, and “above” a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0065] In the description of the present disclosure, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present disclosure.

[0066] In the description of this specification, the description with reference to the terms "certain embodiments", "one embodiment", "some embodiments", "illustrative embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present disclosure.

[0067] The above descriptions are merely embodiments of the present disclosure and are not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. An antenna, It is characterized in that The invention comprises a first radiator (1), a second radiator (2) and a third radiator (3), wherein the first radiator (1) comprises a first branch (11), a second branch (12) and a third branch (13), wherein the second branch (12) and the third branch (13) are located on opposite sides of the first branch (11) and are respectively connected to two ends of the first branch (11); The second radiator (2) and the third radiator (3) are respectively located on two opposite sides of the first branch (11), and are spaced apart from the first branch (11).

2. The antenna according to claim 1, It is characterized in that The second radiator (2) and the third radiator (3) are arranged in a colinear manner and are perpendicular to the first branch (11).

3. The antenna according to claim 2, It is characterized in that The second branch node (12) and the third branch node (13) are parallel to each other and perpendicular to the first branch node (11).

4. The antenna according to claim 3, It is characterized in that The first radiator (1) is a centrosymmetric structure.

5. The antenna according to claim 2, It is characterized in that The first branch (11) has a first groove (112) and a second groove (113) on opposite sides thereof, the first groove (112) being opposite to the end of the second radiator (2), and the second groove (113) being opposite to the end of the third radiator (3).

6. The antenna according to claim 5, It is characterized in that The width (m1) of the first groove (112) is equal to the width (m2) of the second groove (113), the width (n2) of the second radiator (2) is equal to the width (n3) of the third radiator (3), and the width (n2) of the second radiator (2) is greater than the width (m1) of the first groove (112).

7. The antenna according to claim 5, It is characterized in that The invention also comprises a feeding port (111), a first grounding port (21) and a second grounding port (31), wherein the feeding port (111) is connected to the center of the first branch node (11), the first grounding port (21) is connected to an end of the second radiator (2) close to the first branch node (11), and the second grounding port (31) is connected to an end of the third radiator (3) close to the first branch node (11).

8. The antenna according to claim 5, It is characterized in that The antenna further comprises a dielectric plate (4) and a coupling plate (5), wherein the dielectric plate (4) has a first surface and a second surface opposite to each other, the first radiator (1), the second radiator (2) and the third radiator (3) are located on the first surface, and the coupling plate (5) is located on the second surface.

9. The antenna according to claim 8, It is characterized in that The first surface of the medium plate (4) is provided with a first protrusion (41) and a second protrusion (42), and the first protrusion (41) and the second protrusion (42) are respectively located in the first groove (112) and the second groove (113).

10. The antenna according to claim 8, It is characterized in that The geometric center of the orthographic projection of the first radiator (1) on the first surface coincides with the geometric center of the first surface, and the edge of the dielectric plate (4) coincides with the edge of the coupling plate (5).

11. The antenna according to claim 10, It is characterized in that The dielectric plate (4) and the coupling plate (5) are square, and the side length (L0) of the square is 9.5-10.5 mm.

12. The antenna according to any one of claims 1 to 11, It is characterized in that The distance between the second radiator (2) and the first branch (11) is 0.45-0.55 mm, and the distance between the third radiator (3) and the first branch (11) is 0.45-0.55 mm.

13. The antenna according to any one of claims 1 to 11, It is characterized in that The length (L1) of the first branch (11) is 7.5-8.5 mm, the length (L2) of the second branch (12) and the third branch (13) is 3.7-4.3 mm, and the width (d1) of the first branch (11), the second branch (12) and the third branch (13) is 1.8-2.2 mm.

14. A terminal device, It is characterized in that The terminal device comprises a mainboard and the antenna according to any one of claims 1 to 13, wherein the mainboard is located in a housing of the terminal device and close to a corner of the terminal device, and the antenna is electrically connected to the mainboard.

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