Antenna structure and electronic device

Abstract

The present disclosure provides an antenna structure and an electronic device. The antenna structure comprises a first antenna and a second antenna adjacent to each other, a first feed point is arranged on the first antenna, a second feed point is arranged on the second antenna, a first branch and a second branch are arranged between the first antenna and the second antenna, the first branch and the second branch are connected to the ground respectively, the first branch and the second branch are spaced apart from the first antenna and the second antenna respectively, a length difference between the first branch and the second branch is less than a set threshold, and a break is arranged between the first branch and the second branch for breaking a floor intrinsic mode. Thus, the coupling between the adjacent antennas can be reduced, and the isolation can be improved.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of antennas, and in particular, to an antenna structure and an electronic device. BACKGROUND

[0002] Modern antenna design relies on electromagnetic field numerical calculation methods, including Finite Element Method (FEM), Finite Difference Time Domain (FDTD) and Method of Moments, to analyze the performance of antennas. These methods can quickly and accurately analyze the radiation and scattering performance of antennas and are widely used. Although these methods can obtain accurate solutions to corresponding electromagnetic problems, they cannot explain the internal mechanism of antenna performance from the physical nature and are difficult to design antennas with specific performance. Therefore, Harrington et al. proposed a characteristic mode theory to analyze the radiation field and scattering field between pure metal and pure dielectric bodies based on the Method of Moments. This theory can not only give the physical nature of actual electromagnetic problems and explain the internal mechanism of object scattering and radiation characteristics, but also obtain object scattering and radiation performance.

[0003] Currently, the application and development of the characteristic mode theory focus on antenna engineering and become one of the mainstream choices for antenna system analysis and design. For example, decoupling using characteristic modes, calculating the Q value of an antenna using characteristic modes, and designing MIMO (Multiple Input Multiple Output) antennas. SUMMARY

[0004] The present disclosure provides an antenna structure and an electronic device to solve at least some of the problems of the related art.

[0005] According to a first aspect of an embodiment of the present disclosure, an antenna structure is provided. The antenna structure includes adjacent first and second antennas, a first feed point is provided on the first antenna, a second feed point is provided on the second antenna, a first stub and a second stub are provided between the first and second antennas, the first and second stubs are connected to ground, the first and second stubs are spaced apart from the first and second antennas, respectively, the length difference between the first and second stubs is less than a set threshold, and a break is provided between the first and second stubs to destroy a floor eigenmode.

[0006] Optionally, the difference between the operating frequency ranges of the first and second antennas is within the range of the highest frequency plus or minus 1 / 2 times the highest frequency in the operating frequency range of the first and second antennas.

[0007] Optionally, the length difference between the first branch and the second branch is less than one sixth of a wavelength of a medium.

[0008] Optionally, the total length of the first branch and the second branch is set to a range of one sixth of a wavelength of a medium to one fourth of a wavelength of a medium.

[0009] Optionally, the first branch is directly connected to the ground; or the first branch is connected to the ground through an inductance or a capacitance.

[0010] Optionally, the second branch is directly connected to the ground; or the second branch is connected to the ground through an inductance or a capacitance.

[0011] According to a second aspect of the embodiments of the present disclosure, an electronic device is provided. The electronic device comprises the antenna structure according to any one of the above embodiments.

[0012] Optionally, the first antenna and the second antenna are located near the R angle of the top or the bottom of the electronic device.

[0013] Optionally, the break is located within a range of ± one tenth of a wavelength of a medium from the central position of the electronic device.

[0014] The technical solutions provided by the embodiments of the present disclosure can at least achieve the following beneficial technical effects:

[0015] The present disclosure achieves the above-mentioned technical effects by providing the first branch and the second branch connected to the ground respectively on the antenna structure, breaking the original floor intrinsic mode, changing the path of the current, reducing the coupling between the adjacent antennas, improving the isolation of the antennas, and improving the performance of the antennas.

[0016] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative labor.

[0018] Figure 1 is a structural schematic diagram of an antenna structure.

[0019] Figure 2 is a structural schematic diagram of an antenna structure according to an exemplary embodiment of the present disclosure.

[0020] Figure 3is a structural diagram of another antenna structure shown in an example embodiment of the present disclosure.

[0021] Figure 4 is Figure 3 The antenna structure shown in Figure 1 is a comparison diagram of simulation efficiency of the antenna structures shown in DETAILED DESCRIPTION

[0022] The example embodiments will be described in detail herein with reference to the attached drawings. The description of the example embodiments is intended to apply to various alternative embodiments as well. It is to be understood that other equipment and processes can be utilized without departing from the scope of the present disclosure. Unless otherwise defined, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terms "first," "second," and the like, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Also, the terms "a" and "an" and the like convey the meaning of "one or more." The terminology includes the words noted above, derivatives thereof, and words of similar import. The phrase "associated with," as well as derivatives thereof, can mean to include, be part of, interconnect with, or be implemented with.

[0023] Unless otherwise defined, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terms "first," "second," and the like, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Also, the terms "a" and "an" and the like convey the meaning of "one or more." The terminology includes the words noted above, derivatives thereof, and words of similar import. The phrase "associated with," as well as derivatives thereof, can mean to include, be part of, interconnect with, or be implemented with.

[0024] Figure 1 A structural diagram of an antenna structure 10 is disclosed. As shown in Figure 1As shown, for example, a top antenna of a mobile phone usually includes a first antenna ANT1 and a second antenna ANT2, which are usually arranged near the left and right R corners of the top of the mobile phone. A first feed point F1 is provided on the first antenna ANT1, and a second feed point F2 is provided on the second antenna ANT2. For the first antenna ANT1 and the second antenna ANT2 of the top antenna layout of the mobile phone, a middle-to-ground stub 11 is generally used, which is located between the first antenna ANT1 and the second antenna ANT2 and is spaced apart from the first antenna ANT1 and the second antenna ANT2, respectively, so as to reduce the coupling between the first antenna ANT1 and the second antenna ANT2 and improve the isolation.

[0025] However, by analyzing Figure 1 It can be seen from the current mode of the antenna structure 10 shown that the main role of the antenna structure 10 from the first feed point F1 to the second feed point F2 is a co-directional floor current mode, for example, Figure 1 As shown by the current arrows I from left to right in the floor current mode, the floor current mode can cause efficiency notches in the passband of the first antenna ANT1 and the second antenna ANT2, as shown in Figure 4

[0026] In order to solve the problem of poor antenna isolation caused by the coupling between adjacent antennas, the present disclosure proposes an improved antenna structure, which uses the characteristic mode theory to reduce the coupling between adjacent antennas and increase the isolation between antennas.

[0027] The antenna structure includes adjacent first and second antennas, a first feed point is provided on the first antenna, a second feed point is provided on the second antenna, a first stub and a second stub are provided between the first antenna and the second antenna, the first stub and the second stub are connected to the ground, respectively, and the first stub and the second stub are spaced apart from the first antenna and the second antenna, respectively.

[0028] By providing the first stub and the second stub connected to the ground on the antenna structure, the original floor eigenmode is destroyed, the path of the current is changed, the coupling between adjacent antennas or MIMO system antennas is reduced, the isolation of the antennas is improved, and the performance of the antennas is improved. Different positions of the break loading cause different destruction of the floor eigenmode, and different effects are achieved.

[0029] The antenna structure of the present disclosure and the electronic device having the same will be described in detail below with reference to the accompanying drawings. In the case of no conflict, the features in the following embodiments and implementation manners can be combined with each other.

[0030] Figure 2 ​A structural diagram of an antenna structure 20 is disclosed in an exemplary embodiment of the present disclosure. As shown in Figure 2 The antenna structure 20 includes a first antenna ANTI and a second antenna ANT2 adjacent to each other. A first feed point F1 is provided on the first antenna ANTI, and a second feed point F2 is provided on the second antenna ANT2. A first branch 211 and a second branch 212 are provided between the first antenna ANTI and the second antenna ANT2, and the first branch 211 and the second branch 212 are connected to ground branches GND1 and GND2, respectively. The first branch 211 is spaced apart from the first antenna ANTI, and the second branch 212 is spaced apart from the second antenna ANT2. The length difference between the first branch 211 and the second branch 212 is less than a set threshold value.

[0031] In some embodiments, a break 22 for destroying a floor eigenmode is provided between the first branch 211 and the second branch 212. For example, the first branch 211 and the second branch 212 can be formed by opening the break 22 on the branch 21 between the first antenna ANTI and the second antenna ANT2. The break 22 can destroy the branch length between the first antenna ANTI and the second antenna ANT2 by loading, so as to destroy the floor eigenmode. Different effects can be achieved by loading the break 22 at different positions.

[0032] For example, Figure 2 As shown by the current arrows I from top to left and right in Figure 1 respectively, the break 22 opened on the branch 21 destroys the original floor current mode shown in

[0033] In an embodiment, the total length of the first branch 211 and the second branch 212 is set to be in the range of 1 / 6 of a medium wavelength to 1 / 4 of a medium wavelength, so that the first antenna ANTI and the second antenna ANT2 are physically close to each other.

[0034] The frequencies of the first antenna ANTI and the second antenna ANT2 are close to each other. The difference between the frequency ranges of the first antenna ANTI and the second antenna ANT2 is in the range of the highest frequency plus or minus 1 / 2 of the highest frequency within the frequency range of the first antenna ANTI and the second antenna ANT2. For example, the frequency range of the first antenna ANTI is f1-f2, and the frequency range of the second antenna ANT2 is f3-f4, wherein the frequency range f3-f4 of the second antenna ANT2 is not less than the frequency range f1-f2 of the first antenna ANTI. Therefore, the highest frequency within the frequency range of the first antenna ANTI and the second antenna ANT2 is the frequency f4. Therefore, the difference Δf between the frequency ranges of the first antenna ANTI and the second antenna ANT2 is as follows:

[0035]

[0036] The first branch 211 can be directly connected to the ground GND1; or, the first branch 211 can also be connected to the ground GND1 through an inductance or a capacitance. Similarly, the second branch 212 can be directly connected to the ground GND2; or, the second branch 212 can also be connected to the ground GND2 through an inductance or a capacitance. Wherein, the first branch 211 and the second branch 212 can be connected to the ground in the same way or in different ways, and the present disclosure does not limit this. The GND1 and GND2 shown in the figure are only used to represent that the way of connecting to the ground can be different.

[0037] In some embodiments, the length difference between the first branch 211 and the second branch 212 of the present disclosure is less than one fifth of the wavelength of the medium.

[0038] In Figure 2 In the embodiment shown, the length L1 of the first branch 211 is not equal to the length L2 of the second branch 212, i.e. L1≠L2.

[0039] In one embodiment, the length L1 of the first branch 211 can be less than the length L2 of the second branch 212, i.e. L1<L2.

[0040] As Figure 2 When L1<L2, the degree of destruction of the floor eigenmode of the first antenna ANT1 is greater than the degree of destruction of the floor eigenmode of the second antenna ANT2, at this time, the in-band coupling influence of the second antenna ANT2 on the first antenna ANT1 is greater than the in-band coupling influence of the first antenna ANT1 on the second antenna ANT2, i.e. the deterioration of the in-band efficiency dip of the first antenna ANT1 on the efficiency is lower than the deterioration of the in-band efficiency dip of the second antenna ANT2 on the efficiency.

[0041] In another embodiment, the length L1 of the first branch 211 can also be greater than the length L2 of the second branch 212, i.e. L1>L2.

[0042] When L1>L2, the degree of destruction of the floor eigenmode of the first antenna ANT1 is less than the degree of destruction of the floor eigenmode of the second antenna ANT2, at this time, the in-band coupling influence of the second antenna ANT2 on the first antenna ANT1 is less than the in-band coupling influence of the first antenna ANT1 on the second antenna ANT2, i.e. the deterioration of the in-band efficiency dip of the first antenna ANT1 on the efficiency is greater than the deterioration of the in-band efficiency dip of the second antenna ANT2 on the efficiency.

[0043] Figure 3 Another structural schematic diagram of an antenna structure 10 is disclosed, which is shown in an exemplary embodiment of the present disclosure. As Figure 3 shown, Figure 3 The antenna structure 30 shown has the same structure asFigure 2 The antenna structure 20 shown has a structure similar to that of the antenna structure 10 shown in FIG. 1. Figure 2 The difference between the antenna structure 20 shown and the antenna structure 10 shown in FIG. 1 is that the position of the break 22 is located at the middle of the branch 21, and the break 22 divides the branch 21 into a first branch 211 and a second branch 212, wherein the length L1 of the first branch 211 is equal to the length L2 of the second branch 212, i.e. L1=L2. Figure 3

[0044] As shown by the current arrows I from top to left and right sides in FIG. 2, when L1=L2, the damage to the floor eigenmode is the strongest, the position of the break 22 is the current zero point, at this time, the currents on both sides of the break 22 are reversed, at this time, the coupling between the first antenna ANT1 and the second antenna ANT2 is the weakest, and the best isolation efficiency is achieved, as shown in FIG. 3. Figure 3 As shown in FIG. 3, there is no efficiency dip in the band of the first antenna ANT1 and the second antenna ANT2. Figure 4

[0045] Figure 4 The antenna structure 30 shown in FIG. 2 is disclosed in the present disclosure. Figure 3 The simulation efficiency comparison chart of the antenna structure 30 shown in FIG. 2 and the antenna structure 10 shown in FIG. 1 is shown in FIG. 4. Figure 1 As shown in FIG. 4, the simulation results are as follows: from the antenna structure 30 shown in FIG. 2 of the present disclosure, Figure 4 The efficiency comparison of the antenna structure 30 shown in FIG. 2 and the antenna structure 10 shown in FIG. 1 shows that in the antenna structure 30 shown in FIG. 2 of the present disclosure, Figure 3 As shown in FIG. 5, there is no efficiency dip in the band of the first antenna ANT1 and the second antenna ANT2, while Figure 1 As shown in FIG. 5, there is no efficiency dip in the band of the first antenna ANT1 and the second antenna ANT2, while Figure 3 As shown in FIG. 5, there is no efficiency dip in the band of the first antenna ANT1 and the second antenna ANT2, while Figure 1 As shown in FIG. 5, there is no efficiency dip in the band of the first antenna ANT1 and the second antenna ANT2, while

[0046] Therefore, the antenna structure 30 shown in FIG. 2 of the present disclosure can very well reduce the coupling between the antennas and increase the isolation between the antennas. Figure 3 The antenna structure 30 shown in FIG. 2 of the present disclosure has excellent performance. Figure 3 The above only lists the simulation efficiency comparison chart of the antenna structure 30 shown in FIG. 2 and the antenna structure 10 shown in FIG. 1. It can be understood that although the performance of the antenna structure 20 shown in FIG. 1 may not be as good as that of the antenna structure 30 shown in FIG. 2 of the present disclosure, compared with the antenna structure 10 shown in FIG. 1,

[0047] The above only lists the simulation efficiency comparison chart of the antenna structure 30 shown in FIG. 2 and the antenna structure 10 shown in FIG. 1. Figure 3 It can be understood that although the performance of the antenna structure 20 shown in FIG. 1 may not be as good as that of the antenna structure 30 shown in FIG. 2 of the present disclosure, compared with the antenna structure 10 shown in FIG. 1, Figure 1 The above only lists the simulation efficiency comparison chart of the antenna structure 30 shown in FIG. 2 and the antenna structure 10 shown in FIG. 1. Figure 2 It can be understood that although the performance of the antenna structure 20 shown in FIG. 1 may not be as good as that of the antenna structure 30 shown in FIG. 2 of the present disclosure, compared with the antenna structure 10 shown in FIG. 1, Figure 3 The above only lists the simulation efficiency comparison chart of the antenna structure 30 shown in FIG. 2 and the antenna structure 10 shown in FIG. 1. Figure 1 The above only lists the simulation efficiency comparison chart of the antenna structure 30 shown in FIG. 2 and the antenna structure 10 shown in FIG. 1. Figure 2 ​The in-band efficiency notch of the first antenna ANT1 and / or the second antenna ANT2 in the illustrated antenna structure 20 will also have a significantly less impact on the efficiency than Figure 1 The illustrated antenna structure 10.

[0048] The antenna structure 20 / 30 of the present disclosure Figure 2 The illustrated antenna structure 20 and Figure 3 The illustrated antenna structure 30 can be applied to antennas or MIMO antenna systems that are physically similar.

[0049] It should be noted that the structure of the first antenna ANT1 and the second antenna ANT2 illustrated in the accompanying drawings of the present disclosure is only schematically shown as an example. However, the structure of the first antenna ANT1 and the second antenna ANT2 of the present disclosure is not limited to that shown in the accompanying drawings. In fact, the antenna structure 20 / 30 of the present disclosure does not limit the specific structure of the first antenna ANT1 and the second antenna ANT2 and their radiation patterns. As long as there is an isolation problem between two antennas that are physically adjacent, the antenna structure 20 / 30 of the present embodiment can be applied.

[0050] The present embodiment also provides an electronic device comprising the antenna structure 20 / 30 described in the above embodiments and implementations.

[0051] In an alternative embodiment, the first antenna ANT1 and the second antenna ANT2 can be located near the top left and right R corners of the electronic device. In another alternative embodiment, the first antenna ANT1 and the second antenna ANT2 can also be located near the bottom left and right R corners of the electronic device.

[0052] Optionally, the discontinuity 22 is located within a range of ±1 / 10 of the medium wavelength from the center of the electronic device, which is different from the gap between the branch 21 and the first antenna ANT1 and the second antenna ANT2.

[0053] It should be noted that the description of the antenna structure 20 / 30 in the above embodiments and implementations also applies to the electronic device of the present disclosure. In the present embodiment, the electronic device described above can be a mobile phone, a Tablet Personal Computer, a Laptop Computer, a personal digital assistant (PDA), a Mobile Internet Device (MID), or a Wearable Device, etc.

[0054] The electronic device of the present disclosure adopts the above-mentioned antenna structure 20 / 30, can effectively solve the problem of poor antenna isolation caused by strong coupling of the antennas therein, and thus can have better performance.

[0055] Other embodiments of the present disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the exemplary embodiments disclosed herein. It is intended that the present disclosure cover any and all variations of the present disclosure that come within the scope of the following claims and their equivalents. It is intended that the specification and examples be considered exemplary only, with the true scope and spirit of the present disclosure being indicated by the following claims.

[0056] It should be understood that the above description is only the preferred embodiment of the present disclosure, and is not intended to limit the present disclosure. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. An antenna structure, characterized by The antenna structure comprises adjacent first and second antennas, a first feed point is provided on the first antenna, a second feed point is provided on the second antenna, a first branch and a second branch are provided between the first and second antennas, the first and second branches are connected to ground respectively, the first and second branches are spaced apart from the first and second antennas respectively, a length difference between the first and second branches is less than a set threshold, and a break is provided between the first and second branches for breaking a floor eigenmode.

2. The antenna structure of claim 1, wherein, A difference between operating frequency ranges of the first and second antennas is within a range of a highest frequency of the operating frequency ranges of the first and second antennas plus or minus 1 / 2 times the highest frequency.

3. The antenna structure of claim 1 or 2, wherein, The length difference between the first and second branches is less than one sixth of a dielectric wavelength.

4. The antenna structure of claim 3, wherein, A total length of the first and second branches is set within a range of one sixth to one fourth of a dielectric wavelength.

5. The antenna structure of claim 1 or 2, wherein, The first branch is directly connected to ground; or the first branch is indirectly connected to ground through an inductance or a capacitance.

6. The antenna structure of claim 1 or 2, wherein, The second branch is directly connected to ground; or the second branch is indirectly connected to ground through an inductance or a capacitance.

7. An electronic device, comprising: The antenna structure according to any one of claims 1 to 6.

8. The electronic device of claim 7, wherein, The first and second antennas are located near an R corner of a top or a bottom of the electronic device.

9. The electronic device of claim 7, wherein, The break is located within a range of ±1 / 10 of a dielectric wavelength from a central position of the electronic device.

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