WO2020168925A1

WO2020168925A1 - Antenna and mobile terminal

Info

Publication number: WO2020168925A1
Application number: PCT/CN2020/074480
Authority: WO
Inventors: 余冬; 刘珂鑫; 龚贻文; 尤佳庆; 王岩; 薛亮
Original assignee: 华为技术有限公司
Priority date: 2019-02-22
Filing date: 2020-02-07
Publication date: 2020-08-27
Also published as: CN111613905A

Abstract

Provided are an antenna and a mobile terminal. The 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; and the radiators of the first sub-antenna and the second sub-antenna further comprise a second branch. During configuration, the second branch is electrically connected to the first branch, and the second branch and the first branch intersect at a set angle; and the ratio of the length of the second branch to the wavelength of a specific working frequency is within a set threshold value, wherein the specific working frequency is within a working frequency band of the second sub-antenna. By means of configuring a second branch to be electrically connected to a first branch and to intersect with same at a set angle and by means of defining the length of the second branch, a resonance formed by the second branch can be compatible with half of a mode of the first branch so as to widen the bandwidth of a frequency band of an antenna. Moreover, a reverse current between the first branch and the second branch can be reduced, and an efficiency pit is shallow, thereby improving the performance of the antenna and the communication effect of the antenna.

Description

Antenna and mobile terminal

This application claims the priority of a Chinese patent application filed with the State Intellectual Property Office of China, the application number is 201910135456.1, and the title of the invention is "an antenna and mobile terminal" on February 22, 2019. The entire content is incorporated into this application by reference. .

Technical field

This application relates to the field of communication technology, and in particular to an antenna and a mobile terminal.

Background technique

With the development of information technology, the 5G network with its peak theoretical transmission speed of up to tens of Gb per second, which is hundreds of times faster than the 4G network, has become increasingly popular. In order to meet the transmission requirements of 5G networks, 5G mobile terminals need to be equipped with more antennas (N77, N78, N79) in a limited space and cover a wider frequency band.

In the existing antennas, the MHB (medium and high frequency) antenna and the N77 antenna share a radiator to save space. The MHB antenna and the N77 antenna are designed on the frame of the mobile terminal, and the wifi5G antenna is set near the frame. In the method, the MHB antenna and the N77 antenna only use half the mode of the frame, and the bandwidth of the coverage frequency band is narrow, not enough to cover the N77 frequency band; in order to improve this situation, by adding a parallel branch to the frame, one can be added to the N77 antenna Resonance broadens the bandwidth of the frequency band, but due to the reverse current between the parallel branches and the frame, efficiency pits will be generated near 3.8 GHz, the worst point is -7.5dBi.

Summary of the invention

The present application provides an antenna and a mobile terminal to expand the bandwidth of the antenna and improve the communication effect of the antenna.

In a first aspect, an antenna is provided. The antenna includes a first sub-antenna and a second sub-antenna. During installation, in order to save space, the radiators of the first sub-antenna and the second sub-antenna share the first branch. In order to broaden the bandwidth of the antenna, the radiators of the first sub-antenna and the second sub-antenna further include a second stub. When set up, the second stub is electrically connected to the first stub, and the The second stub intersects the first stub at a set angle, the ratio of the length of the second stub to the wavelength of the specific operating frequency is within a set threshold, wherein the specific operating frequency is operating at the second sub-antenna In the frequency band.

In the above technical solution, by setting the second stub to be electrically connected to the first stub and intersecting at a set angle, and at the same time, to limit the length of the second stub, the resonance formed by the second stub can be made to be the same as the first stub. The half mode is compatible to broaden the frequency band bandwidth of the antenna, and can reduce the reverse current between the first stub and the second stub, so that the second stub and the first stub have a half mode The fusion is better, and the efficiency pit is shallow, thereby improving the performance of the antenna and improving the communication effect of the antenna.

In a specific embodiment, the antenna further includes a third sub-antenna, and the third sub-antenna includes a third branch and a fourth branch, and the third branch and the fourth branch are located in the second branch. On both sides of the branch, and the third branch and the fourth branch are coupled.

In a specific embodiment, the second branch is used to adjust the coupling amount of the third branch and the fourth branch. The second branch enhances the coupling effect between the third branch and the fourth branch in the third sub-antenna, and at the same time can increase the antenna radiation aperture, optimize resonance matching, and improve efficiency.

In a specific embodiment, the set angle formed by the second branch and the first branch is 10°-170°. By setting the second stub to be non-parallel to the first stub, the reverse current between the second stub and the first stub is reduced.

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

In a specific embodiment, the intersection of the second branch and the first branch is located in the middle of the first branch, so as to reduce the introduction of the second branch and the half mode of the first branch. The influence of the resonance of the first branch.

In a specific embodiment, an inductor is further included. The inductor is connected to the first stub and is grounded at an end away from the first stub, so as to optimize the performance of the antenna.

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

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

In a specific embodiment, the ratio of the length of the second branch to the wavelength of the second sub-antenna working frequency band is 0.25, and the length of the second branch is a quarter wavelength of the second sub-antenna working frequency band. At this time, 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 metal.

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

In a second aspect, a mobile terminal is provided. The mobile terminal includes a frame and the antenna according to any one of the above, and a part of the frame is multiplexed as the first branch.

In the above technical solution, the radiators of the first sub-antenna and the second sub-antenna share the first stub, and the part in the frame is multiplexed as the first stub. By setting the second stub to be the same as the first stub. It is electrically connected and intersects at a set angle, and at the same time limits the length of the second stub, so that the resonance formed by the second stub can be compatible with the half mode of the first stub, so as to broaden the frequency band bandwidth of the antenna. Reduce the reverse current between the first stub and the second stub, so that the second stub and the first stub have a better half-mode fusion, and the efficiency pit is shallow, thereby improving the performance of the antenna and improving the antenna performance Communication effect.

Description of the 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 schematic diagram of the return loss of the antenna structure shown in FIG. 2;

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 by the prior art;

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

FIG. 9 is a schematic structural diagram of a mobile terminal provided by an embodiment of the present invention;

FIG. 10 is a schematic structural diagram of an antenna provided by an embodiment of the present invention;

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

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

FIG. 13 is a schematic diagram of the return loss 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;

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

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 schematic diagram showing the comparison of the return loss of the third sub-antenna when the second branch is multiplexed in the antenna structure shown in FIG. 10;

18 is a schematic diagram of efficiency comparison of the third sub-antenna when multiplexing the second branch in the antenna structure shown in FIG. 10;

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

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

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

22 is a schematic diagram of isolation comparison between the third sub-antenna and the first sub-antenna in the antenna structure shown in FIG. 10 with and without the second stub and different positions of the second stub;

FIG. 23 is a schematic diagram showing the comparison of the return loss of the third sub-antenna in the antenna structure shown in FIG. 10 with and without the second stub and different positions of the second stub;

24 is a schematic diagram of efficiency comparison of the third sub-antenna in the antenna structure shown in FIG. 10 with and without the second stub and different positions of the second stub;

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

FIG. 26 is a schematic diagram of simulation 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 objectives, technical solutions, and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings.

In order to facilitate the understanding of the antenna provided in the embodiment of the present invention, and to facilitate the understanding of the antenna provided in the embodiment of the present invention, first explain the state of antenna performance detection. The antenna performance detection adopts the free space (FS) state. At this time, the mobile terminal Place directly without contact with human body. Secondly, the antenna provided in the embodiment of the present invention can be a combination of two sub-antennas, or a combination of three sub-antennas, or a combination of more than three sub-antennas. Although the number of sub-antennas is different, the frequency band bandwidth of the antenna is different. The principle of stretching is similar. For ease of description, the antenna provided in the embodiment of the present invention is a combination of three sub-antennas. Finally, explain that the antenna mentioned in this embodiment is a combination of medium and high frequency antennas, N77 antennas and wifi5G antennas. 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, 5.725GHz-5.825 GHz. For the convenience of description, the efficiency pit mentioned in the embodiment of the present application refers to a pit-like shape formed suddenly after a sudden drop in efficiency in a certain frequency range.

In view of the contradiction between the limited arrangement space and more antennas in the prior art antennas, the current multi-antenna common body design is selected on the frame structure, as shown in Figure 1, the first sub-antenna 1 and the second antenna The two sub-antennas 2 are designed on the frame of the mobile terminal, and the third sub-antenna 3 is arranged near the frame. The first sub-antenna 1 is a medium and high frequency antenna, the second sub-antenna 2 is an N77 antenna, and the third sub-antenna 3 is wifi5G antenna, as shown in Figure 2, the radiators of the first sub-antenna 1 and the second sub-antenna 2 share a first branch 4, and the third sub-antenna 3 includes a third branch 5 and a fourth branch 6, as shown in the figure 3 and Figure 4, it can be seen that the first sub-antenna 1 and the second sub-antenna 2 only use one-half mode of the frame, and there is only one resonance. The bandwidth is narrow and the bandwidth is not enough to cover the N77 frequency band. In order to broaden the frequency band, as shown in Figure 5 As shown, a second branch 7 is added to the frame. The second branch 7 includes two sections, the first section is parallel to the first branch 4, and the second section connects the first section to the first branch 4, and the third The sub-antenna 3 does not undergo transformation and still includes the third branch 5 and the fourth branch 6, as shown in Figure 6 and Figure 7, the N77 antenna has added a resonance, which makes the bandwidth wider. As shown in Figure 8, the antenna is at 3.8GHz There are efficiency pits nearby, the worst point is -7.5dBi, which makes the communication effect of the antenna poor, but at this time, according to the current flow shown in Figure 8, it can be seen that the reverse current between the parallel branches and the frame acts. In order to broaden the bandwidth of the antenna without affecting the communication effect, embodiments of the present application provide an antenna and a mobile terminal.

As shown in Figure 9 and Figure 10, the embodiment of the present invention provides an antenna. The antenna is arranged in a mobile terminal. The antenna includes a first sub-antenna 1 and a second sub-antenna 2. Of course, the antenna is installed in the mobile terminal. When the size is limited, the first sub-antenna 1 and the second sub-antenna 2 can also be combined into one sub-antenna. When the size of the built-in antenna of the mobile terminal is sufficient, it can also include more than two sub-antennas. Body design, where the first sub antenna 1 is a medium and high frequency antenna, and the second sub antenna 2 is an N77 antenna. In order to save space, it is convenient to arrange the first sub antenna 1 and the second sub antenna 2 in a relatively limited space of the mobile terminal. During specific installation, the radiators of the first sub-antenna 1 and the second sub-antenna 2 share the first branch 4. In order to broaden 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 also improves the first branch 4 shared by the first sub-antenna 1 and the second sub-antenna 2. A second branch 7 is added to the 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, which are different from the first branch 4 and the prior art. The second branch 7 is arranged in different ways. In the specific setting, the second branch 7 provided by the embodiment of the present invention intersects the first branch 4 at a set angle, and the ratio of the length of the second branch 7 to the wavelength of the specific operating frequency Located within the set threshold, where the specific operating frequency is within the operating frequency band of the second sub-antenna 2, which limits the length of the second stub 7, which can make the resonance formed by the second stub 7 equal to half of the first stub 4 The molds are compatible and the fusion effect is better.

As shown in Figure 11 and Figure 12, Figure 11 shows the current flow of the first sub-antenna 1 and the second sub-antenna 2 at 3.7GHz, and Figure 12 shows the first sub-antenna 1 and the second sub-antenna 2 in For the current flow direction at 4.2GHz, the current flow direction between the first branch 4 and the second branch 7 is not opposite. Compared with the current flow in the two parallel branches shown in Figure 8, the first branch The reverse current between 4 and the second branch 7 is relatively small. Therefore, adding a non-parallel second branch 7 can reduce the reverse current. As shown in Figure 13 and Figure 14, Figure 13 shows the resonance number and position of the first sub-antenna 1 and the second sub-antenna 2 after adding the second branch 7. The N77 antenna adds a resonance, which broadens the frequency band of the antenna Bandwidth, Figure 14 shows the efficiency change of the first sub-antenna 1 and the second sub-antenna 2 after adding the second branch 7, an efficiency pit appears near 3.9GHz, the worst point is -5.6978dBi, while the existing In the technology, two antennas with parallel branches produce efficiency pits near 3.8 GHz shown in FIG. 7, and the worst point is -7.5dBi. Compared the two, the antenna provided by the embodiment of the present invention has shallow efficiency pits, and the second branch 7 is better integrated with the half mode of the first branch 4, thereby improving the performance of the antenna and improving the communication effect of the antenna.

Continuing to refer to Figure 10, Figure 10 shows the specific structure of an antenna provided by an embodiment of the present invention. The antenna also includes a third sub-antenna 3, which is a wifi5G antenna. In order to save space, it is convenient for mobile terminals The first sub-antenna 1, the second sub-antenna 2 and the third sub-antenna 3 can be arranged in a relatively limited space. For specific installation, the third sub-antenna 3 is arranged near the frame of the mobile terminal and close to the first sub-antenna 1 and the position of 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 arranged oppositely, and the third branch 6 and the fourth branch 5 are located in the second branch. On both sides of the branch 7, the third branch 6 and the fourth branch 5 and the second branch 7 are located on the same side of the first branch 4, and there is a certain gap 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 set, 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, Fig. 16, Fig. 17, and Fig. 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, and Fig. 17 shows The return loss of the third sub-antenna 3 changes when the second branch 7 is multiplexed. Figure 18 shows the change in the efficiency of the third sub-antenna 3 when the second branch 7 is multiplexed. The third branch 6 and the fourth branch 5 Coupling connection, when the second branch 7 is not reused, the third sub-antenna 3 has two resonance points, one resonance point is near 5.2794GHz, the lowest point is -16.96dBa, and the other resonance point is near 5.6964GHz, the lowest point It is -14.948dBa. When the second branch 7 is reused, the third sub-antenna 3 also has two resonance points, one resonance point is near 5.3266GHz, the lowest point is -7.6364dBa, and the other resonance point is near 5.5476GHz, the lowest The point is -7.0917dBa. From the above data, it can be seen that the coupling effect of the third branch 6 and the fourth branch 5 is better after the second branch 7 is reused, and the second branch 7 can adjust the third branch 6 and the fourth branch The coupling amount of 5. When the second branch 7 is not reused, the third sub-antenna 3 has an efficiency pit near 5.8GHz, and the worst point is -8.272dBi. When the second branch 7 is reused, the efficiency of the third sub-antenna 3 near 5.8GHz is -5.3126dBi. According to the above data, the efficiency pit of the third sub-antenna 3 becomes shallower when the second branch 7 is reused, and the third branch 6 and the fourth sub-antenna 3 are enhanced by the second branch 7 The coupling effect of the stub 5 further improves the performance of the antenna and the communication effect of the antenna.

Continuing to refer to Figure 17 and Figure 18, when the second branch 7 is not multiplexed, the efficiency of the third sub-antenna 3 near 5.2GHz is -4.9433dBi, and the efficiency near 5.3GHz is -3.6844dBi. In the second branch of multiplexing The efficiency of the third sub-antenna 3 near 5.2GHz at 7 is -2.7737dBi, and the efficiency near 5.3GHz is -2.4073dBi. According to the above data, it can be seen from the above data that the third sub-antenna is multiplexed at the second branch 7 3 can increase the antenna radiation aperture. Referring to Figure 19, Figure 20 and Figure 21 together, Figure 19 shows the current flow of the third sub-antenna 3 at 5.3 GHz, Figure 20 shows the current flow of the third sub-antenna 3 at 5.5 GHz, and Figure 21 The current flow direction of the third sub-antenna 3 at 5.7 Hz is shown. The current in the third branch 6 gradually decreases, and the current in the fourth branch 5 gradually moves closer to the inside of the fourth branch 5. Therefore, a positive The second branch 7 arranged alternately can reduce the reverse current.

In the specific setting, the second branch 7 is arranged non-parallel to the first branch 4 to reduce the reverse current between the second branch 7 and the first branch 4. Among them, the setting angle formed by the second branch 7 and the first branch 4 is 10°-170°. In specific selection, the setting angle formed by 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°, of course, the second branch 7 and The setting angle formed by a branch 4 is not limited to the above-mentioned numerical values, and can also be other values in the range of 10°-170°, and the setting angle formed by the second branch 7 and the first branch 4 The specific value of the fixed angle is selected according to the actual situation of the antenna.

Continuing to refer to Figure 10, Figure 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 It is arranged orthogonal to the first stub 4 to excite the mode of the orthogonal stub. Refer to Figure 8, Figure 11 and Figure 12 together. Figure 8 shows the current when the two stubs are parallel, and Figure 11 shows the first The current of the sub-antenna 1 and the second sub-antenna 2 at 3.7GHz, Figure 12 shows the current of the first sub-antenna and the second sub-antenna at 4.2GHz, the current between the first branch 4 and the second branch 7 The direction of current flow is not opposite. Compared with the current flow in the two parallel branches shown in FIG. 8, the current in the first branch 4 gradually moves closer to the inside of the first branch 4, and the third branch 6 The current in the fourth branch 5 gradually decreases, and the current in the fourth branch 5 gradually moves 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 second branch 7 and the first branch The half-mode fusion of branch 4 is better than that of parallel branches. Refer to Figure 7 and Figure 14 together. Figure 7 shows the efficiency changes of the first sub-antenna 1 and the second sub-antenna 2 without the second branch 7, and Figure 14 shows the first sub-antenna after the second branch 7 is added. The efficiency of the sub-antenna 1 and the second sub-antenna 2 changes. When there is no second stub 7, the first sub-antenna 1 and the second sub-antenna 2 will produce efficiency pits near 3.8GHz, the worst point is -7.5dBi, and the second is increasing. After stub 7, the first sub-antenna 1 and the second sub-antenna 2 have an efficiency pit near 3.9GHz, and the worst point is -5.6978dBi. Therefore, when the second stub 7 and the first stub 4 are arranged orthogonally The antenna provided by the embodiment of the invention has a shallow efficiency pit, and the performance of the antenna is better.

Refer to Figure 22, Figure 23 and Figure 24 together. Figure 22 shows the isolation of the third sub-antenna 3 and the first sub-antenna 1 with and without the second branch 7 and the second branch 7 orthogonally arranged. Fig. 23 shows the return loss changes of the third sub-antenna 3 with and without the second stub 7 and the second stub 7 orthogonally arranged. Fig. 24 shows the third sub-antenna 3 at With and without the second branch 7 and the second branch 7 orthogonally set the efficiency changes in three cases, when the second branch 7 is reused, a high point appears near 3.8059GHz, the high point is -19.128dBa at 5.2363GHz Another high point appears nearby, the high point is -15.363dBa, and the system efficiency of the third sub-segment 3 is increased by 2dBa on average. Therefore, the antenna provided by the embodiment of the present invention can optimize resonance matching by orthogonally setting the second sub-segment 7, and then Improve system efficiency.

Continuing to refer to Figure 10, Figure 10 shows the position where the second branch 7 and the first branch 4 intersect. In the specific arrangement, the second branch 7 is set close to the middle of the first branch 4, and the second branch 7 and The intersection of the first branch 4 is located in the middle of the first branch 4. Refer to Figure 11 and Figure 12 together. Figure 11 shows the current of the first sub antenna 1 and the second sub antenna 2 at 3.7 GHz, Figure 12 Shows the current of the first sub-antenna and the second sub-antenna at 4.2GHz, the middle of the first branch 4 is the current strong point area of the half mode of the first branch 4, and the second branch 7 Set in the middle of the first branch 4, on the one hand, it can reduce the influence of the introduction of the second branch 7 on the half mode of the first branch 4, and on the other hand, it can also reduce the introduction of the second branch 7 on the The influence of the resonance of the first branch 4.

Continuing to refer to FIG. 10, FIG. 10 shows the specific structure of the antenna. When the antenna is set up, the first branch 4 needs to be preselected to be grounded. The grounding point can be set near the ends of the first branch 4. The antenna also includes an inductance 8. The inductance 8 is used to reduce or even offset the adverse effects on the first branch 4 caused by the introduction of the second branch 7. The inductance value of the inductance 8 can be based on the specific actual conditions of the antenna and the introduced second branch 2. The choice is made according to the situation. When the second branch 7 and the first branch 4 are arranged orthogonally, the inductance value of the inductor 2 can be 2nh, of course, it is not limited to 2nh, and smaller floating inductance values above and below 2nh are acceptable. In the specific setting, one end of the inductor 8 is connected to the first branch 4, and the end far 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 the inductor 8 and the The connection point of one branch 4 is close to the ground point of the first branch 4. Through the grounding of the inductor 8 and the grounding of the first branch 4 itself, the performance of the antenna is further optimized.

When the length of the second stub 7 is specifically set, the ratio of the length of the second stub 7 to the wavelength of the working frequency band of the second sub-antenna 2 is within the set threshold 0.2-0.3. In specific selection, the ratio of the length of the second stub 7 to the wavelength of the working frequency band of the second sub-antenna 2 can be 0.22, 0.24, 0.25, 0.26, 0.28, 0.3. Of course, the length of the second stub 7 and the second sub-antenna 2 The ratio of the wavelength of the working frequency band is not limited to the above-mentioned numerical value, and can also be other numerical values in the range of 0.2-0.3, and 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 specific The value is selected according to the actual situation of the antenna.

As shown in Figure 25 and Figure 26, Figure 25 shows a schematic diagram of the simulation of the return loss of the first sub-antenna and the second sub-antenna, and Figure 26 shows a schematic diagram of the simulation of the efficiency of the first sub-antenna and the second sub-antenna In the specific setting, 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 0.25, and when the length of the second branch 7 is a quarter wavelength of the working frequency band of the second sub-antenna 2, The fusion effect of the half mode of the second branch 7 and the first branch 4 is better, which in turn makes the performance of the antenna better and the communication effect of the antenna better.

In the 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 all be made of metal materials. 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 can be prepared by laser direct molding, and the first branch 4 can also be in the form of a flexible circuit board, but the first branch 4 is not limited to these two forms, and can also be For other structural forms, the structural form of the first branch 4 is selected according to the specific actual conditions of the first sub-antenna 1, the second sub-antenna 2, and the third sub-antenna 3 and the mobile terminal.

In addition, the present invention also provides a mobile terminal, which may be a mobile phone, a tablet computer, or a smart watch. And the mobile terminal includes any one of the above antennas. The mobile terminal includes a frame and the antenna of any one of the above, and a part of the frame is multiplexed as the 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 stub 4, and the part in the frame is multiplexed as the first stub 4, and the second stub 7 is Set to be electrically connected to the first stub 4 and intersect at a set angle, and at the same time limit the length of the second stub 7, so that the resonance formed by the second stub 7 can be compared with the half mode of the first stub 4 In order to broaden the frequency band bandwidth of the antenna, it can also reduce the reverse current between the first branch 4 and the second branch 7, so that the second branch 7 and the first branch 4 have a better half-mode fusion , The efficiency pit is shallow, thereby improving the performance of the antenna and improving the communication effect of the antenna.

The above are only specific implementations of this application, but the scope of protection of this application is not limited to this. Anyone familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in this application, and they should all cover Within the protection scope of this application. Therefore, the protection scope of this application shall be subject to the protection scope of the claims.

Claims

An antenna comprising a first sub-antenna and a second sub-antenna, wherein the radiators of the first sub-antenna and the second sub-antenna share a first branch; characterized in that, the first sub-antenna and The radiator of the second sub-antenna further includes a second stub, and the second stub is electrically connected to the first stub and intersects at a set angle. The length of the second stub is equal to the wavelength of the specific operating frequency. The ratio of is within a set threshold, where the specific operating frequency is within the operating frequency band of the second sub-antenna.
The antenna according to claim 1, further comprising a third sub-antenna, the third sub-antenna including a third branch and a fourth branch, and the third branch and the fourth branch are located in the fourth branch. Both sides of the two branches, and the third branch and the fourth branch are coupled and connected.
3. The antenna according to claim 2, wherein the second branch is used to adjust the coupling amount between the third branch and the fourth branch.
The antenna according to claims 1-3, wherein the set angle formed by the second stub and the first stub is 10°-170°.
The antenna according to claim 4, wherein the set angle formed by the second stub and the first stub is 90°.
The antenna according to any one of claims 1-5, wherein the intersection of the second stub and the first stub is located in the middle of the first stub.
8. The antenna according to any one of claims 1 to 6, further comprising an inductor, and the inductor is connected to the first stub and is grounded at an end away from the first stub.
8. The antenna according to claim 7, wherein the inductance value of the inductor is 2 nh.
The antenna according to claim 1, wherein the set threshold is 0.2-0.3.
The antenna according to claim 9, wherein the ratio of the length of the second stub to the wavelength of the working frequency band of the second sub-antenna is 0.25.
The antenna according to any one of claims 1-6, wherein the material of the first branch is metal.
The antenna according to claim 11, wherein the first stub is prepared by laser direct molding, or the first stub is a flexible circuit board.
A mobile terminal, comprising a frame, characterized by further comprising the antenna according to any one of claims 1 to 12, and a part of the frame is multiplexed as the first branch.