阅读说明：本技术 一种天线及移动终端 (Antenna and mobile terminal ) 是由 余冬 刘珂鑫 龚贻文 尤佳庆 王岩 薛亮 于 2019-02-22 设计创作，主要内容包括：本申请提供了一种天线及移动终端,该天线包括第一子天线及第二子天线,第一子天线和第二子天线的辐射体共用第一枝节；第一子天线及第二子天线的辐射体还包括第二枝节,在设置时,第二枝节与第一枝节电连接,并且第二枝节与第一枝节成设定角度相交,第二枝节的长度与特定工作频率的波长的比值位于设定阈值内,其中特定工作频率在第二子天线工作频段内,通过将第二枝节设置为与第一枝节成电连接且设定角度相交,并且同时限定第二枝节的长度,能够使第二枝节形成的谐振与第一枝节的二分之一模可相容,以展宽天线的频段带宽,而且能够减小第一枝节和第二枝节之间的反向电流,效率凹坑浅,进而改善天线的性能,提高天线的通信效果。(The application provides an antenna and a mobile terminal, wherein the antenna comprises a first sub-antenna and a second sub-antenna, and radiating bodies of the first sub-antenna and the second sub-antenna share a first branch section; the radiators of the first sub-antenna and the second sub-antenna further comprise a second branch, when the radiators are arranged, the second branch is electrically connected with the first branch, the second branch and the first branch are crossed at a set angle, the ratio of the length of the second branch to the wavelength of a specific working frequency is within a set threshold, wherein the specific working frequency is within a working frequency band of the second sub-antenna, the second branch is electrically connected with the first branch and crossed at the set angle, and the length of the second branch is limited at the same time, so that resonance formed by the second branch is compatible with a half mode of the first branch, the bandwidth of the frequency band of the antenna is widened, reverse current between the first branch and the second branch can be reduced, an efficiency pit is shallow, the performance of the antenna is improved, and the communication effect of the antenna is improved.)

1. An antenna comprises a first sub-antenna and a second sub-antenna, wherein radiators of the first sub-antenna and the second sub-antenna share a first branch; the antenna is characterized in that the radiators of the first sub-antenna and the second sub-antenna further comprise a second branch, the second branch is electrically connected with the first branch and intersects with the first branch at a set angle, the ratio of the length of the second branch to the wavelength of a specific working frequency is within a set threshold, and the specific working frequency is within the working frequency band of the second sub-antenna.

2. The antenna of claim 1, further comprising a third sub-antenna, wherein the third sub-antenna comprises a third branch and a fourth branch, the third branch and the fourth branch are located on two sides of the second branch, and the third branch and the fourth branch are coupled.

3. The antenna of claim 2, wherein the second stub is configured to adjust an amount of coupling between the third stub and the fourth stub.

4. The antenna of claims 1-3, wherein the second leg and the first leg are angled at a set angle of 10 ° -170 °.

5. The antenna of claim 4, wherein the second leg and the first leg are disposed at a predetermined angle of 90 °.

6. An antenna according to any of claims 1-5, wherein the intersection of the second branch and the first branch is located in the middle of the first branch.

7. The antenna of any one of claims 1-6, further comprising an inductor, wherein the inductor is connected to the first stub and an end of the inductor remote from the first stub is grounded.

8. The antenna of claim 7, wherein the inductance of the inductor is 2 nh.

9. The antenna of claim 1, wherein the set threshold is 0.2-0.3.

10. The antenna of claim 9, wherein the ratio of the length of the second stub to the wavelength of the second sub-antenna operating band is 0.25.

11. An antenna according to any of claims 1 to 6, wherein the material of the first stub is a metal.

12. The antenna of claim 11, wherein the first stub is fabricated by laser direct structuring or the first stub is a flexible circuit board.

13. A mobile terminal comprising a frame, further comprising an antenna according to any of claims 1-12, wherein a portion of the frame is multiplexed into the first stub.

Technical Field

The present application relates to the field of communications technologies, and in particular, to an antenna and a mobile terminal.

Background

With the development of information technology, 5G networks have become popular with transmission advantages that their peak theoretical transmission speed can reach tens of Gb per second, hundreds of times faster than that of 4G networks. In order to meet the transmission requirements of the 5G network, the 5G mobile terminal needs to configure more antennas (N77, N78, N79) in a limited space and cover a wider frequency band.

An MHB (medium-high frequency) antenna and an N77 antenna in the existing antenna share a radiator to save space, wherein the MHB antenna and the N77 antenna are designed on a frame of a mobile terminal in a combined mode, and a wifi5G antenna is arranged near the frame, but in the arrangement mode, the MHB antenna and the N77 antenna only use a half mode of the frame, so that the bandwidth of a coverage frequency band is narrow and is not enough to cover the N77 frequency band; to improve this situation, a parallel stub is added to the bezel to add a resonance to the N77 antenna, widening the bandwidth of the band, but due to the reverse current effect between the parallel stub and the bezel, an efficiency pit is created around 3.8GHz, worst-7.5 dBi.

Disclosure of Invention

The application provides an antenna and a mobile terminal, which are used for widening the bandwidth of the antenna and improving the communication effect of the antenna.

In a first aspect, an antenna is provided, where the antenna includes a first sub-antenna and a second sub-antenna, and when the antenna is installed, in order to save space, radiators of the first sub-antenna and the second sub-antenna share a first branch; in order to widen the bandwidth of the antenna, the radiators of the first sub-antenna and the second sub-antenna further include a second branch, and when the antenna is set, the second branch is electrically connected to the first branch, and the second branch intersects with the first branch at a set angle, and a ratio of a length of the second branch to a wavelength of a specific operating frequency is within a set threshold, where the specific operating frequency is within an operating frequency band of the second sub-antenna.

In the above technical solution, the second stub is electrically connected to the first stub and is intersected at a set angle, and the length of the second stub is limited, so that the resonance formed by the second stub is compatible with the half mode of the first stub, the bandwidth of the frequency band of the antenna is widened, and the reverse current between the first stub and the second stub is reduced, so that the second stub is better fused with the half mode of the first stub, the efficiency pit is shallow, the performance of the antenna is improved, and the communication effect of the antenna is improved.

In a specific embodiment, the antenna further includes a third sub-antenna, where the third sub-antenna includes a third branch and a fourth branch, the third branch and the fourth branch are located on two sides of the second branch, and the third branch and the fourth branch are coupled.

In a specific embodiment, the second branch is used for adjusting the coupling amount of the third branch and the fourth branch. The coupling effect of the third branch and the fourth branch in the third sub-antenna is enhanced through the second branch, the radiation aperture of the antenna can be increased, resonant matching is optimized, and the efficiency is improved.

In a specific embodiment, the set angle between the second branch and the first branch is 10 ° to 170 °. By arranging the second limb non-parallel to the first limb, reverse current flow between the second limb and the first limb is reduced.

In a specific embodiment, the set angle between the second branch and the first branch is 90 ° to minimize reverse current flow between the second branch and the first branch.

In a particular embodiment, the intersection of the second branch and the first branch is located in the middle of the first branch to reduce the effect of the introduction of the second branch on the half mode of the first branch and the resonance of the first branch.

In a specific embodiment, the antenna further comprises an inductor, wherein the inductor is connected with the first branch, and one end of the inductor, which is far away from the first branch, is grounded, so that the performance of the antenna is optimized.

In a specific embodiment, the inductance value of the inductor is 2 nh.

In a specific embodiment, the set threshold is 0.2 to 0.3.

In a specific embodiment, a ratio of the length of the second branch to the wavelength of the second sub-antenna operating frequency band is 0.25, and when the length of the second branch is one-quarter wavelength of the second sub-antenna operating frequency band, the fusion effect of the second branch and the half mode of the first branch is better.

In a specific embodiment, the material of the first branch is a metal.

In a specific embodiment, the first branch is prepared by laser direct structuring, or the first branch is a flexible circuit board, but is not limited to these two forms.

In a second aspect, a mobile terminal is provided, where the mobile terminal includes a frame and further includes any one of the antennas, and a part of the frame is multiplexed into the first stub.

In the above technical solution, the radiators of the first sub-antenna and the second sub-antenna share the first branch, and the portion in the frame is reused as the first branch, and the second branch is set to be electrically connected to the first branch and intersect at a set angle, and the length of the second branch is defined at the same time, so that the resonance formed by the second branch is compatible with the half mode of the first branch, thereby widening the bandwidth of the frequency band of the antenna, and reducing the reverse current between the first branch and the second branch, so that the second branch and the half mode of the first branch are better fused, the efficiency pit is shallow, and further the performance of the antenna is improved, and the communication effect of the antenna is improved.

Drawings

Fig. 1 is a schematic structural diagram of a mobile terminal provided in the prior art;

fig. 2 is a schematic structural diagram of an antenna provided in the prior art;

FIG. 3 is a return loss diagram of the antenna structure shown in FIG. 2;

FIG. 4 is a schematic diagram of the efficiency of the antenna structure shown in FIG. 2;

fig. 5 is a schematic structural diagram of another antenna provided in the prior art;

FIG. 6 is a return loss diagram of the antenna structure shown in FIG. 4;

FIG. 7 is a schematic diagram of the efficiency of the antenna structure shown in FIG. 4;

FIG. 8 is a schematic current flow diagram of the antenna structure shown in FIG. 4;

fig. 9 is a schematic structural diagram of a mobile terminal according to an embodiment of the present invention;

fig. 10 is a schematic structural diagram of an antenna according to an embodiment of the present invention;

FIG. 11 is a schematic current flow diagram of the first sub-antenna and the second sub-antenna at 3.7GHz in the antenna structure shown in FIG. 10;

fig. 12 is a schematic current flow diagram of the first sub-antenna and the second sub-antenna at 4.2GHz in the antenna structure shown in fig. 10;

FIG. 13 is a return loss diagram of the first sub-antenna and the second sub-antenna in the antenna structure shown in FIG. 10;

fig. 14 is a schematic diagram of the efficiency of the first sub-antenna and the second sub-antenna in the antenna structure shown in fig. 10;

FIG. 15 is a return loss diagram of a third sub-antenna of the antenna structure shown in FIG. 10;

fig. 16 is a schematic diagram of the efficiency of the third sub-antenna in the antenna structure shown in fig. 10;

fig. 17 is a return loss comparison diagram of the third sub-antenna when the second branch is multiplexed in the antenna structure shown in fig. 10;

fig. 18 is a comparison of the efficiency of the third sub-antenna when multiplexing the second branches in the antenna structure shown in fig. 10;

fig. 19 is a schematic current flow diagram of the third sub-antenna at 5.3GHz in the antenna structure shown in fig. 10;

fig. 20 is a schematic current flow diagram of the third sub-antenna at 5.5GHz in the antenna structure shown in fig. 10;

fig. 21 is a schematic current flow diagram of the third sub-antenna at 5.7Hz in the antenna structure shown in fig. 10;

fig. 22 is a schematic diagram showing the contrast of the isolation between the third sub-antenna and the first sub-antenna at different positions with or without the second branch and the second branch in the antenna structure shown in fig. 10;

fig. 23 is a return loss comparison diagram of the third sub-antenna in the antenna structure shown in fig. 10 in three cases of the presence, absence and different positions of the second branch;

fig. 24 is a schematic diagram illustrating efficiency comparison of the third sub-antenna in the antenna structure shown in fig. 10 in three cases of the presence, absence and different positions of the second branch;

FIG. 25 is a simulated schematic diagram of return losses of the first sub-antenna and the second sub-antenna in the antenna structure shown in FIG. 10;

fig. 26 is a simulation diagram of the efficiency of the first sub-antenna and the second sub-antenna in the antenna structure shown in fig. 10.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more clear, the present application will be further described in detail with reference to the accompanying drawings.

For convenience in understanding the antenna provided in the embodiment of the present invention, first, a state of antenna performance detection is described, where the antenna performance detection is in a Free Space (FS) state, and at this time, the mobile terminal is directly placed without contacting with a human body. The antenna provided by the embodiment of the present invention may be a combination of two sub-antennas, a combination of three sub-antennas, or a combination of more than three sub-antennas, and although the number of the sub-antennas is different, the broadening principle of the frequency band bandwidth of the antenna is similar, and for convenience of description, the antenna provided by the embodiment of the present invention is a combination of three sub-antennas. Finally, the antenna mentioned in this embodiment is a combination of a medium-high frequency antenna, an N77 antenna, and a wifi5G antenna, where the frequency band of the N77 antenna is 3.3GHz-4.2GHz, and the frequency band of the wifi5G antenna is 5.15GHz-5.35GHz, and 5.725GHz-5.825 GHz. For convenience of description, the efficiency pits mentioned in the embodiments of the present application refer to pit-like shapes formed by sudden drop of efficiency in a certain frequency band.

In order to solve the contradiction between the limited arrangement space and the configuration of more antennas of the prior art, a structural form in which multiple antennas are designed in common on a frame is currently selected, as shown in fig. 1, a first sub-antenna 1 and a second sub-antenna 2 are designed in common on the frame of a mobile terminal, and a third sub-antenna 3 is arranged near the frame, wherein the first sub-antenna 1 is a medium-high frequency antenna, the second sub-antenna 2 is an N77 antenna, and the third sub-antenna 3 is a wifi5G antenna, as shown in fig. 2, radiators of the first sub-antenna 1 and the second sub-antenna 2 share a first branch 4, the third sub-antenna 3 includes a third branch 5 and a fourth branch 6, as shown in fig. 3 and 4, the first sub-antenna 1 and the second sub-antenna 2 only use one half of the frame, only have one resonance, the bandwidth is narrow, the bandwidth is not enough to cover the N77 frequency band, as shown in fig. 5, a second branch 7 is added on the frame, the second branch 7 comprises two sections, the first section is parallel to the first branch 4, the second section connects the first section to the first branch 4, the third sub-antenna 3 still comprises a third branch 5 and a fourth branch 6 without conversion, as shown in fig. 6 and 7, a resonance is added to the N77 antenna, so that the bandwidth is widened a little, as shown in fig. 8, the antenna generates an efficiency pit near 3.8GHz, the worst point is-7.5 dBi, so that the communication effect of the antenna is poor, but at this time, according to the current flow direction shown in fig. 8, the reverse current action between the parallel branch and the frame is known. In order to widen the bandwidth of an antenna on the basis of not influencing the communication effect, the embodiment of the application provides the antenna and the mobile terminal.

As shown in fig. 9 and 10, an embodiment of the present invention provides an antenna, where the antenna is disposed in a mobile terminal, and the antenna includes a first sub-antenna 1 and a second sub-antenna 2, and of course, the first sub-antenna 1 and the second sub-antenna 2 may also be combined into one sub-antenna when the size of the antenna is limited in the mobile terminal, and when the size of the antenna is sufficient in the mobile terminal, the antenna may further include more than two sub-antennas, and a radiator common body design of multiple sub-antennas is also included, where the first sub-antenna 1 is a medium-high frequency antenna, and the second sub-antenna 2 is an N77 antenna, so as to save space, and facilitate to dispose the first sub-antenna 1 and the second sub-antenna 2 in a relatively limited space of the mobile terminal, and when the antenna is specifically disposed, the first sub-antenna 1 and the second sub-antenna 2 share a first branch 4. In order to widen the bandwidth of the antenna and improve the antenna function provided by the embodiment of the present invention, the antenna provided by the embodiment of the present invention further improves the first branch 4 shared by the first sub-antenna 1 and the second sub-antenna 2, and the second branch 7 is added on the first branch 4, that is, the radiators of the first sub-antenna 1 and the second sub-antenna 2 include the first branch 4 and the second branch 7, different from the way of arranging the first branch 4 and the second branch 7 in the prior art, in a specific arrangement, the second branch 7 provided by the embodiment of the present invention intersects the first branch 4 at a set angle, and a ratio of a length of the second branch 7 to a wavelength of a specific operating frequency is within a set threshold, wherein the specific operating frequency is within an operating frequency band of the second sub-antenna 2, the length of the second branch 7 is limited, so that a resonance formed by the second branch 7 is compatible with a half mode of the first branch 4, and the fusion effect is better.

As shown in fig. 11 and 12, fig. 11 shows the current flowing direction of the first sub-antenna 1 and the second sub-antenna 2 at 3.7GHz, fig. 12 shows the current flowing direction of the first sub-antenna 1 and the second sub-antenna 2 at 4.2GHz, the current flowing direction between the first branch 4 and the second branch 7 is not opposite, and the reverse current between the first branch 4 and the second branch 7 is smaller than the current flowing direction in the two parallel branches shown in fig. 8, so that the reverse current can be reduced by adding one non-parallel second branch 7. As shown in fig. 13 and fig. 14, fig. 13 shows the number and positions of resonances of the first sub-antenna 1 and the second sub-antenna 2 after adding the second branch 7, and the N77 antenna adds a resonance to broaden the bandwidth of the antenna, and fig. 14 shows that the efficiency of the first sub-antenna 1 and the second sub-antenna 2 changes after adding the second branch 7, and an efficiency pit appears near 3.9GHz, and the worst point is-5.6978 dBi, whereas an antenna with two branches in parallel in the prior art generates an efficiency pit near 3.8GHz shown in fig. 7, and the worst point is-7.5 dBi.

With continuing reference to fig. 10, fig. 10 shows a specific structure of an antenna according to an embodiment of the present invention, where the antenna further includes a third sub-antenna 3, and the third sub-antenna 3 is a wifi5G antenna, so as to save space and facilitate the arrangement of the first sub-antenna 1, the second sub-antenna 2, and the third sub-antenna 3 in a relatively limited space of the mobile terminal, and when the specific arrangement is performed, the third sub-antenna 3 is disposed near a border of the mobile terminal and near the first sub-antenna 1 and the second sub-antenna 2. The third sub-antenna 3 provided by the embodiment of the present invention includes a third branch 6 and a fourth branch 5, the third branch 6 and the fourth branch 5 are disposed opposite to each other, the third branch 6 and the fourth branch 5 are located on two sides of the second branch 7, the third branch 6, the fourth branch 5 and the second branch 7 are located on the same side of the first branch 4, meanwhile, a certain gap exists between the third branch 6 and the fourth branch 5, the second branch 7 is located between the third branch 6 and the fourth branch 5, and the second branch 7 extends into the gap between the third branch 6 and the fourth branch 5.

When the second branch 7 is specifically provided, the second branch 7 is used for the coupling amount of the third branch 6 and the fourth branch 5. As shown in fig. 15, 16, 17 and 18, fig. 15 shows the change of the return loss of the third sub-antenna 3, fig. 16 shows the change of the efficiency of the third sub-antenna 3, fig. 17 shows the change of the return loss of the third sub-antenna 3 when the second branch 7 is multiplexed, fig. 18 shows the change of the efficiency of the third sub-antenna 3 when the second branch 7 is multiplexed, the third branch 6 and the fourth branch 5 are coupled, the third sub-antenna 3 has two resonance points when the second branch 7 is not multiplexed, one resonance point is located near 5.2794GHz, the lowest point is-16.96 dBa, the other resonance point is located near 5.6964GHz, the lowest point is-14.948 dBa, the third sub-antenna 3 also has two resonance points when the second branch 7 is multiplexed, one resonance point is located near 5.3266GHz, the lowest point is-7.6364 dBa, the other resonance point is located near 5.5476GHz, the lowest point is-7.0917 dBa, from the above data, after multiplexing the second branch 7, the coupling effect of the third branch 6 and the fourth branch 5 is good, and the second branch 7 can adjust the coupling amount of the third branch 6 and the fourth branch 5. It can be seen from the above data that the third sub-antenna 3 has an efficiency pit near 5.8GHz when the second branch 7 is not multiplexed, the worst point is-8.272 dBi, and the third sub-antenna 3 has an efficiency near 5.8GHz when the second branch 7 is multiplexed, which is-5.3126 dBi, and that the efficiency pit of the third sub-antenna 3 is shallower when the second branch 7 is multiplexed, and the second branch 7 enhances the coupling effect between the third branch 6 and the fourth branch 5 in the third sub-antenna 3, thereby improving the performance of the antenna and enhancing the communication effect of the antenna.

Continuing with fig. 17 and 18, when the second branch 7 is not multiplexed, the efficiency of the third sub-antenna 3 is-4.9433 dBi at around 5.2GHz, the efficiency is-3.6844 dBi at around 5.3GHz, the efficiency of the third sub-antenna 3 is-2.7737 dBi at around 5.2GHz when the second branch 7 is multiplexed, and the efficiency is-2.4073 dBi at around 5.3GHz, and it is understood from the above data that the antenna radiation aperture of the third sub-antenna 3 can be increased when the second branch 7 is multiplexed. Referring to fig. 19, 20 and 21 together, fig. 19 shows the current flow direction of the third sub-antenna 3 at 5.3GHz, fig. 20 shows the current flow direction of the third sub-antenna 3 at 5.5GHz, fig. 21 shows the current flow direction of the third sub-antenna 3 at 5.7Hz, the current of the third branch 6 gradually decreases, and the current in the fourth branch 5 gradually converges toward the inside of the fourth branch 5, so that the reverse current can be reduced by adding one orthogonally arranged second branch 7.

In a specific arrangement, the second branch 7 is arranged to be non-parallel to the first branch 4, so that the reverse current between the second branch 7 and the first branch 4 is reduced. Specifically, when the set angle between the second branch 7 and the first branch 4 is 10 ° -170 °, the set angle between the second branch 7 and the first branch 4 is 10 °, 25 °, 30 °, 35 °, 40 °, 45 °, 50 °, 55 °, 60 °, 65 °, 70 °, 75 °, 80 °, 85 °, 90 °, 95 °, 100 °, 105 °, 110 °, 115 °, 120 °, 125 °, 130 °, 135 °, 140 °, 145 °, 150 °, 155 °, 160 °, 175 °, 180 °, 185 °, although the set angle between the second branch 7 and the first branch 4 is not limited to the above-mentioned values, and may be other values within a range of 10 ° to 170 °, and the specific value of the set angle between the second branch 7 and the first branch 4 is selected according to the actual conditions of the antenna.

Continuing with fig. 10, fig. 10 shows the angle between the second branch 7 and the first branch 4, the set angle formed by the second branch 7 and the first branch 4 is set to 90 °, the second branch 7 and the first branch 4 are orthogonally arranged, and the orthogonal branch pattern is excited, referring to fig. 8, 11 and 12 together, fig. 8 shows the current when the two branches are parallel, fig. 11 shows the current at 3.7GHz of the first sub-antenna 1 and the second sub-antenna 2, fig. 12 shows the current at 4.2GHz of the first sub-antenna and the second sub-antenna, the current flow between the first branch 4 and the second branch 7 is not in the opposite direction, compared with the current flow in the two parallel branches shown in fig. 8, the current in the first branch 4 gradually gets closer to the inside of the first branch 4, the current in the third branch 6 gradually decreases, and the current in the fourth branch 5 gradually gets closer to the inside of the fourth branch 5, the reverse current between the second branch 7 and the first branch 4 is smaller, and the half-mode fusion of the second branch 7 and the first branch 4 is better than that of the parallel branch. Referring to fig. 7 and 14 together, fig. 7 shows the efficiency change of the first sub-antenna 1 and the second sub-antenna 2 when the second branch 7 is not provided, fig. 14 shows the efficiency change of the first sub-antenna 1 and the second sub-antenna 2 when the second branch 7 is added, the first sub-antenna 1 and the second sub-antenna 2 generate an efficiency pit around 3.8GHz when the second branch 7 is not provided, the worst point is-7.5 dBi, the first sub-antenna 1 and the second sub-antenna 2 generate an efficiency pit around 3.9GHz when the second branch 7 is added, and the worst point is-5.6978 dBi, so that the efficiency pit of the antenna provided by the embodiment of the present invention is shallow when the second branch 7 and the first branch 4 are orthogonally arranged, and the performance of the antenna is good.

Referring to fig. 22, 23 and 24 together, fig. 22 shows a change in isolation between the third sub-antenna 3 and the first sub-antenna 1 in the presence or absence of the second branch 7 and in the three cases where the second branch 7 is orthogonally disposed, figure 23 shows the return loss variation of the third sub-antenna 3 with and without the second branch 7 and with the second branch 7 orthogonally arranged, fig. 24 shows the efficiency change of the third sub-antenna 3 in the presence or absence of the second branch 7 and in the case where the second branch 7 is orthogonally arranged, and when the second branch 7 is multiplexed, a high point, at about 3.8059GHz, at-19.128 dBA, another high point appears near 5.2363GHz, the high point is-15.363 dBa, the system efficiency of the third subbranch 3 is improved by 2dBa on average, therefore, the antenna provided by the embodiment of the invention can optimize resonance matching by orthogonally arranging the second branch 7, thereby improving the system efficiency.

With continuing reference to fig. 10, fig. 10 shows a position where the second branch 7 intersects with the first branch 4, and in a specific setting, the second branch 7 is disposed at a position close to the middle of the first branch 4, and the intersection point of the second branch 7 and the first branch 4 is located at the middle of the first branch 4, and with reference to fig. 11 and fig. 12, fig. 11 shows the currents of the first sub-antenna 1 and the second sub-antenna 2 at 3.7GHz, fig. 12 shows the currents of the first sub-antenna and the second sub-antenna at 4.2GHz, and the middle of the first branch 4 is a current intensity point region of a half mode of the first branch 4, and by disposing the second branch 7 at the middle of the first branch 4, on one hand, the influence of the introduction of the second branch 7 on the half mode of the first branch 4 can be reduced, and on the other hand, the influence of the introduction of the second branch 7 on the resonance of the first branch 4 can also be reduced.

With continued reference to fig. 10, fig. 10 shows a specific structure of the antenna, when the antenna is installed, the first branch 4 needs to be pre-grounded, and the grounding point can be located at a position close to the two end portions of the first branch 4. The antenna further comprises an inductor 8, the inductor 8 is used for reducing or even offsetting adverse effects on the first branch 4 caused by the introduction of the second branch 7, the inductance value of the inductor 8 can be selected according to the antenna and the specific practical situation of the introduced second branch 2, when the second branch 7 and the first branch 4 are orthogonally arranged, the inductance value of the inductor 2 can be 2nh, certainly not limited to 2nh, and the inductance values which are slightly floated up and down of 2nh can be all. During specific setting, one end of the inductor 8 is connected with the first branch 4, one end far away from the first branch 4 is grounded, the inductor 8 and the second branch 7 are located on the same side of the first branch 4, and a connection point of the inductor 8 and the first branch 4 is close to a grounding point of the first branch 4. The performance of the antenna is further optimized by the grounding of the inductance 8 and the grounding of the first stub 4 itself.

When the length of the second branch 7 is specifically set, the ratio of the length of the second branch 7 to the wavelength of the working frequency band of the second sub-antenna 2 is within a set threshold value of 0.2-0.3. When specifically selecting, the ratio of the length of the second branch 7 to the wavelength of the operating frequency band of the second sub-antenna 2 may be 0.22, 0.24, 0.25, 0.26, 0.28, 0.3, of course, the ratio of the length of the second branch 7 to the wavelength of the operating frequency band of the second sub-antenna 2 is not limited to the enumerated above values, and may be other values within the range of 0.2-0.3, and the specific value of the ratio of the length of the second branch 7 to the wavelength of the operating frequency band of the second sub-antenna 2 is selected according to the actual situation of the antenna.

As shown in fig. 25 and 26, fig. 25 shows a simulation diagram of return loss of the first sub-antenna and the second sub-antenna, and fig. 26 shows a simulation diagram of efficiency of the first sub-antenna and the second sub-antenna, when the simulation diagram is specifically set, a ratio of a length of the second branch 7 to a wavelength of an operating frequency band of the second sub-antenna 2 is 0.25, and when the length of the second branch 7 is a quarter wavelength of the operating frequency band of the second sub-antenna 2, a fusion effect of a half mode of the second branch 7 and a half mode of the first branch 4 is better, so that performance of the antenna is better, and a communication effect of the antenna is better.

In an embodiment of the present invention, the material of the first branch 4 may be metal. The first sub-antenna 1, the second sub-antenna 2, and the third sub-antenna 3 may be made of metal materials, and the antenna provided in the embodiment of the present invention is an all-metal antenna.

In the embodiment of the present invention, the first branch 4 may be prepared by laser direct structuring, and the first branch 4 may also be in the form of a flexible circuit board, but the first branch 4 is not limited to these two forms, and may also be in other structural forms, and the structural form of the first branch 4 is selected according to the specific practical situations of the first sub-antenna 1, the second sub-antenna 2, the third sub-antenna 3, and the mobile terminal.

In addition, the invention also provides a mobile terminal which can be a mobile phone, a tablet personal computer or an intelligent watch and the like. And the mobile terminal comprises an antenna according to any of the above. The mobile terminal comprises a frame and any one of the antennas, wherein part of the frame is multiplexed into a first branch 4.

In the embodiment of the present invention, the radiators of the first sub-antenna 1 and the second sub-antenna 2 share the first branch 4, and a portion of the frame is reused as the first branch 4, by setting the second branch 7 to be electrically connected to the first branch 4 and intersect at a set angle, and at the same time, defining the length of the second branch 7, the resonance formed by the second branch 7 can be made compatible with the half mode of the first branch 4, so as to broaden the bandwidth of the antenna, and the reverse current between the first branch 4 and the second branch 7 can be reduced, so that the second branch 7 and the half mode of the first branch 4 are better fused, and the efficiency pit is shallower, thereby improving the performance of the antenna and enhancing the communication effect of the antenna.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.