Antenna structure and electronic equipment

Abstract

The invention provides an antenna structure and electronic equipment. The antenna structure comprises a first antenna and a second antenna which are adjacent to each other, a first feeding point is arranged on the first antenna, a second feeding point is arranged on the second antenna, a first branch knot and a second branch knot are arranged between the first antenna and the second antenna, and the first branch knot and the second branch knot are respectively connected to the ground. The first branch knot and the first antenna are spaced, the second branch knot and the second antenna are spaced, the length difference value of the first branch knot and the second branch knot is smaller than a set threshold value, and a breaking joint used for damaging a floor intrinsic mode is arranged between the first branch knot and the second branch knot. Therefore, coupling between adjacent antennas can be reduced, and isolation can be improved.

Description

Technical Field

[0001] The present disclosure relates to the field of antenna technology, and in particular to an antenna structure and an electronic device. Background Art

[0002] Modern antenna design relies on electromagnetic field numerical calculation methods, including finite element method (FEM), finite difference time domain method (FDTD) and moment method, to analyze the performance of antennas. These methods can quickly and accurately analyze and obtain 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 essence, and it is difficult to design antennas with specific performance. Therefore, Harrington et al. proposed the characteristic mode theory based on the moment method to analyze the radiation field and scattering field between pure metals and pure dielectrics. This theory can not only give the physical essence of actual electromagnetic problems, explain the internal mechanism of object scattering and radiation characteristics, but also obtain the object scattering and radiation performance.

[0003] At present, the application and development of characteristic mode theory focuses on domestic antenna engineering and has become one of the mainstream choices for systematic analysis and design of antennas. For example: using characteristic mode decoupling, using characteristic mode to calculate the Q value of antenna, designing MIMO (Multiple Input Multiple Output) antennas, etc. Summary of the invention

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

[0005] According to a first aspect of an embodiment of the present disclosure, an antenna structure is provided. The antenna structure includes a first antenna and a second antenna adjacent to each other, a first feeding point is provided on the first antenna, a second feeding point is provided on the second antenna, a first branch and a second branch are provided between the first antenna and the second antenna, the first branch and the second branch are respectively connected to the ground, the first branch and the first antenna are spaced apart, and the second branch and the second antenna are spaced apart, the length difference between the first branch and the second branch is less than a set threshold, and there is a break between the first branch and the second branch for destroying the floor eigenmode.

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

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

[0008] Optionally, the total length of the first branch and the second branch is set to be in the range of 1 / 6 medium wavelength to 1 / 4 medium wavelength.

[0009] Optionally, the first branch is directly connected to the ground; or, the first branch is connected to the ground via an inductor or a capacitor.

[0010] Optionally, the second branch is directly connected to the ground; or, the second branch is connected to the ground via an inductor or a capacitor.

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

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

[0013] Optionally, the break is located within a range of ±1 / 10 of a medium wavelength offset from the exact center 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 invention provides a first branch and a second branch respectively connected to the ground on the antenna structure, thereby destroying the original floor eigenmode and changing the path of the current, thereby reducing the coupling of adjacent antennas, improving the isolation of the antenna, and thus improving the performance of the antenna.

[0016] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

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

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

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

[0021] Figure 4 yes Figure 3 The antenna structure shown is similar to Figure 1 The simulation efficiency comparison chart of the antenna structure shown. DETAILED DESCRIPTION

[0022] Here, exemplary embodiments will be described in detail, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are only examples of devices and methods consistent with some aspects of the present disclosure.

[0023] The terms used in the present disclosure are only for the purpose of describing specific embodiments, and are not intended to limit the present disclosure. Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, similar words such as "one" or "one" do not indicate quantity restrictions, but indicate that there is at least one, and will be separately described if only "one" is referred to. "Multiple" or "several" means two and more than two. Unless otherwise specified, similar words such as "front", "rear", "lower" and / or "upper", "top", "bottom" are only for the convenience of explanation, and are not limited to one position or one spatial orientation. Similar words such as "include" or "comprise" mean that the elements or objects appearing in front of "include" or "comprise" cover the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. The words "connected" or "connected" and the like are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0024] Figure 1 A schematic diagram of the structure of an antenna structure 10 is disclosed. Figure 1As shown, for example, the antenna on the top of the mobile phone usually includes a first antenna ANT1 and a second antenna ANT2, and the first antenna ANT1 and the second antenna ANT2 are usually arranged near the left and right R corners of the top of the mobile phone. A first feeding point F1 is provided on the first antenna ANT1, and a second feeding 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 branch 11 from the middle to the ground is generally used. The branch 11 is located between the first antenna ANT1 and the second antenna ANT2, and is spaced 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, through analysis Figure 1 It can be seen from the current pattern of the antenna structure 10 shown that the antenna structure 10 is mainly a unidirectional floor current pattern from the first feeding point F1 to the second feeding point F2. For example, Figure 1 As shown by the current arrow I from left to right in FIG. 1 , the floor current mode may cause an efficiency pit to be generated in the band of the first antenna ANT1 and the second antenna ANT2, such as Figure 4 shown.

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

[0027] The antenna structure includes a first antenna and a second antenna adjacent to each other, a first feeding point is provided on the first antenna, a second feeding point is provided on the second antenna, a first branch and a second branch are provided between the first antenna and the second antenna, the first branch and the second branch are respectively connected to the ground, and the first branch and the first antenna are spaced apart, as well as the second branch and the second antenna are spaced apart.

[0028] By providing the first branch and the second branch connected to the ground respectively on the antenna structure, the original floor eigenmode is destroyed, the current path is changed, thereby reducing the coupling of adjacent antennas or MIMO system antennas, improving the isolation of the antenna, and thus improving the performance of the antenna. The position of the fracture loading is different, the destruction of the floor eigenmode is different, and the effect achieved is also different.

[0029] The antenna structure of the present invention and the electronic device having the antenna structure are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the features in the following embodiments and implementations may be combined with each other.

[0030] Figure 2A schematic diagram of an antenna structure 20 is disclosed as an exemplary embodiment of the present disclosure. Figure 2 As shown, the antenna structure 20 includes a first antenna ANT1 and a second antenna ANT2 adjacent to each other. A first feeding point F1 is provided on the first antenna ANT1, and a second feeding point F2 is provided on the second antenna ANT2. A first branch 211 and a second branch 212 are provided between the first antenna ANT1 and the second antenna ANT2, and the first branch 211 and the second branch 212 are connected to the ground GND1 and GND2 branches respectively, and the first branch 211 and the first antenna ANT1 are spaced apart, and the second branch 212 and the second antenna ANT2 are spaced apart. The length difference between the first branch 211 and the second branch 212 is less than a set threshold.

[0031] In some embodiments, there is a break 22 between the first branch 211 and the second branch 212 for destroying the floor eigenmode. For example, the first branch 211 and the second branch 212 can be formed by opening a break 22 on the branch 21 between the first antenna ANT1 and the second antenna ANT2. The length of the branch between the first antenna ANT1 and the second antenna ANT2 can be destroyed by loading the break 22, thereby achieving the purpose of destroying the floor eigenmode. Different loading positions of the break 22 will have different effects.

[0032] For example, Figure 2 As shown by the current arrows I from the top to the left and right sides, the fracture 22 opened on the branch 21 destroys Figure 1 The original floor current pattern is shown.

[0033] In one embodiment, the total length of the first branch 211 and the second branch 212 is set to be within a range of 1 / 6 of a medium wavelength to 1 / 4 of a medium wavelength, so that the first antenna ANT1 and the second antenna ANT2 are physically close.

[0034] The frequencies of the first antenna ANT1 and the second antenna ANT2 are similar. The difference between the operating frequency ranges of the first antenna ANT1 and the second antenna ANT2 is within the range of the highest frequency within the operating frequency ranges of the first antenna ANT1 and the second antenna ANT2 plus or minus 1 / 2 times the highest frequency. For example, the operating frequency range of the first antenna ANT1 is f1~f2, and the operating frequency range of the second antenna ANT2 is f3~f4, wherein the operating frequency range f3~f4 of the second antenna ANT2 is not less than the operating frequency range f1~f2 of the first antenna ANT1. Therefore, the highest frequency within the operating frequency ranges of the first antenna ANT1 and the second antenna ANT2 is frequency f4. Therefore, the difference Δf between the operating frequency ranges of the first antenna ANT1 and the second antenna ANT2 is as shown below:

[0035]

[0036] The first stub 211 can be directly connected to the ground GND1; alternatively, the first stub 211 can also be connected to the ground GND1 through an inductor or a capacitor. Similarly, the second stub 212 can be directly connected to the ground GND2; alternatively, the second stub 212 can also be connected to the ground GND2 through an inductor or a capacitor. Among them, the grounding methods of the first stub 211 and the second stub 212 can be the same or different, and the present disclosure does not limit this. GND1 and GND2 shown in the drawings are only used to indicate that the grounding methods can be different.

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

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

[0039] In one embodiment, the length L1 of the first stub 211 can be less than the length L2 of the second stub 212, that is, L1<L2.

[0040] As Figure 2 shown, when L1<L2, the degree of damage to the floor eigenmode of the first antenna ANT1 is greater than that of the second antenna ANT2. At this time, the in-band coupling effect of the second antenna ANT2 on the first antenna ANT1 is greater than the in-band coupling effect of the first antenna ANT1 on the second antenna ANT2, that is, the deterioration of the in-band efficiency due to the in-band efficiency pit of the first antenna ANT1 is lower than the deterioration of the in-band efficiency due to the in-band efficiency pit of the second antenna ANT2.

[0041] In another embodiment, the length L1 of the first stub 211 can also be greater than the length L2 of the second stub 212, that is, L1>L2.

[0042] When L1>L2, the degree of damage to the floor eigenmode of the first antenna ANT1 is less than that of the second antenna ANT2. At this time, the in-band coupling effect of the second antenna ANT2 on the first antenna ANT1 is less than the in-band coupling effect of the first antenna ANT1 on the second antenna ANT2, that is, the deterioration of the in-band efficiency due to the in-band efficiency pit of the first antenna ANT1 is greater than the deterioration of the in-band efficiency due to the in-band efficiency pit of the second antenna ANT2.

[0043] Figure 3 Disclosed is a schematic structural diagram of another antenna structure 10 shown in an exemplary embodiment of the present disclosure. As Figure 3 shown, Figure 3 the shown antenna structure 30 has the same as Figure 2 The antenna structure 20 shown is generally similar in structure to Figure 2 The difference between the antenna structure 20 shown is that Figure 3 In the antenna structure 30 shown, the break 22 is located in 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, that is, L1=L2.

[0044] like Figure 3 As shown by the current arrows I from the top to the left and right sides, when L1=L2, the damage to the floor eigenmode is the strongest, and 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, achieving the best isolation efficiency, as shown in FIG. Figure 4 As shown, there is no efficiency pit in the band of the first antenna ANT1 and the second antenna ANT2.

[0045] Figure 4 The present disclosure Figure 3 The antenna structure 30 shown is Figure 1 The simulation efficiency comparison diagram of the antenna structure 10 is shown in FIG. Figure 4 As shown, the simulation results are as follows: Figure 3 The antenna structure 30 shown is Figure 1 The efficiency comparison of the antenna structure 10 shown in the figure shows that in the present invention, Figure 3 In the antenna structure 30 shown, the first antenna ANT1 and the second antenna ANT2 have no efficiency pits in the band. Figure 1 The antenna structure 10 shown clearly has an efficiency dip within the band, affecting efficiency by 1 dB.

[0046] Therefore, the present disclosure Figure 3 The antenna structure 30 shown can effectively reduce the coupling between antennas and increase the isolation between antennas. Figure 3 The antenna structure 30 shown has excellent performance.

[0047] The above only lists the Figure 3 The antenna structure 30 shown is Figure 1 The simulation efficiency comparison diagram of the antenna structure 10 shown in FIG. Figure 2 The performance of the antenna structure 20 shown may not be as good as that of the present disclosure. Figure 3 The performance of the antenna structure 30 shown, however, is Figure 1 For the antenna structure 10 shown in FIG. Figure 2The influence of the in-band efficiency pits existing in the first antenna ANT1 and / or the second antenna ANT2 on the efficiency of the antenna structure 20 shown will also be significantly smaller than Figure 1 The antenna structure 10 is shown.

[0048] The present disclosure Figure 2 The antenna structure 20 and Figure 3 The antenna structure 30 shown may be applicable to antennas similar in physical structure or a MIMO antenna system.

[0049] It should be noted that the structural form of the first antenna ANT1 and the second antenna ANT2 shown in the drawings of the present disclosure is schematically shown only as an example. However, the structural form of the first antenna ANT1 and the second antenna ANT2 of the present disclosure is not limited to that shown in the attached drawings. In fact, the antenna structure 20 / 30 of the present disclosure does not limit the specific structural form and radiation pattern of the first antenna ANT1 and the second antenna ANT2. The antenna structure 20 / 30 of the embodiment of the present disclosure can be applied to any isolation problem between two adjacent antennas in physical structure.

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

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

[0052] Optionally, the slit 22 is located within a range of ±1 / 10 of a medium wavelength offset from the exact center of the electronic device, so as to be different from the gaps 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 is also applicable to the electronic device disclosed in the present invention. In this embodiment, the above electronic device can be a mobile phone, a tablet computer (Tablet Personal Computer), a laptop computer (Laptop Computer), a personal digital assistant (Personal Digital Assistant, referred to as PDA), a mobile Internet device (Mobile Internet Device, MID) or a wearable device (Wearable Device), etc.

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

[0055] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the disclosed embodiments disclosed herein. The present disclosure is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The specification and embodiments are to be considered exemplary only, and the true scope and spirit of the present disclosure are indicated by the claims of the present disclosure.

[0056] It should be understood that the above is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure should be included in the scope of protection of the present disclosure.

Claims

1. An antenna structure, characterized in that: It includes a first antenna and a second antenna adjacent to each other, a first feeding point is provided on the first antenna, a second feeding point is provided on the second antenna, a first branch and a second branch are provided between the first antenna and the second antenna, the first branch and the second branch are respectively connected to the ground, the first branch and the first antenna are spaced apart, and the second branch and the second antenna are spaced apart, the length difference between the first branch and the second branch is less than a set threshold, and a break is provided between the first branch and the second branch for destroying the floor eigenmode.

2. The antenna structure according to claim 1, characterized in that: The difference between the operating frequency ranges of the first antenna and the second antenna is within a range of a maximum frequency within the operating frequency ranges of the first antenna and the second antenna plus or minus 1 / 2 times the maximum frequency.

3. The antenna structure according to claim 1 or 2, characterized in that: The difference in length between the first branch and the second branch is less than one fifth of a medium wavelength.

4. The antenna structure according to claim 3, characterized in that: The total length of the first branch and the second branch is set to be in the range of 1 / 6 of a medium wavelength to 1 / 4 of a medium wavelength.

5. The antenna structure according to claim 1 or 2, characterized in that: The first branch is directly connected to the ground; or, the first branch is indirectly connected to the ground via an inductor or a capacitor.

6. The antenna structure according to claim 1 or 2, characterized in that: The second branch is directly connected to the ground; or, the second branch is indirectly connected to the ground via an inductor or a capacitor.

7. An electronic device, characterized in that: Comprising the antenna structure according to any one of claims 1 to 6.

8. The electronic device according to claim 7, characterized in that: The first antenna and the second antenna are located near an R corner of a top or bottom of the electronic device.

9. The electronic device according to claim 7, characterized in that: The slit is located within a range of ±1 / 10 of a medium wavelength offset from the exact center of the electronic device.

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