High isolation antenna and electronic equipment

Abstract

The present application discloses a high-isolation antenna and electronic device, relating to the field of signal transmission. The positive and negative branches of a first antenna are respectively connected to the positive and negative electrodes of a signal source via a feeder line and a ground line of a first transmission line, and are spaced a preset distance from a PCB board. This allows the ground plane of the PCB board to reflect the radiation of the first antenna, weakening the radiation of the first antenna in the direction close to the PCB board. In other words, the main radiation direction of the first antenna is away from the PCB board. A second antenna is provided on or at an edge of the board, with the second positive branch connected to the positive electrode of the signal source and reusing the ground plane of the PCB board as the second negative branch. The negative branch is not shared with the first antenna. Consequently, under the feed excitation of the signal source, the directional patterns of the two antennas are perpendicular in the horizontal direction, reducing the overlap of the directional patterns of the two antennas. This reduces the cross-radiation of the two antennas, thereby improving the isolation between the two antennas.

Description

Technical Field

[0001] The present application relates to the field of signal transmission, and in particular to a high-isolation antenna and electronic equipment. Background Art

[0002] When two antennas are installed in an electronic device and the two antennas operate in the same frequency band, if the antennas are close to each other, the two antennas operating in the same frequency band are likely to affect each other, resulting in a decrease in the performance of each antenna, thereby affecting the wireless performance of the electronic device.

[0003] Currently, the way to improve the wireless performance of such electronic devices is to increase the isolation between the two antennas. Specifically, the isolation between the two antennas is improved by increasing the distance between the two antennas. However, this method cannot ensure that the antenna radiation patterns are completely non-overlapping, and the isolation performance is poor. Summary of the Invention

[0004] The purpose of this application is to provide a high-isolation antenna and electronic device, which can reduce the overlap of the directional patterns of two antennas, that is, reduce the radiation cross-talk of the two antennas, and thus improve the isolation between the two antennas.

[0005] To solve the above technical problems, the present application provides a high isolation antenna, comprising:

[0006] PCB board, including ground plane;

[0007] a first antenna, disposed on a first side of the PCB and spaced a preset distance from an edge of the PCB, the first antenna comprising a first positive branch and a first negative branch;

[0008] a first transmission line, comprising a feeder and a ground wire, wherein one end of the feeder is connected to the positive electrode of the signal source, and the other end of the feeder is connected to the first positive electrode branch; one end of the ground wire is connected to the negative electrode of the signal source, and the other end of the ground wire is connected to the first negative electrode branch;

[0009] A second antenna is provided on the PCB or at an edge of the PCB, and includes a second positive branch connected to the positive electrode of the signal source, and the ground plane of the PCB serves as a second negative branch of the second antenna;

[0010] Under the feeding excitation of the signal source, the directional pattern of the first antenna is perpendicular to the directional pattern of the second antenna in the horizontal direction.

[0011] Preferably, the area of the ground plane is not less than 1 / N of the wavelength of the working frequency band, and N is not greater than 4.

[0012] Preferably, it also includes:

[0013] a third antenna disposed on a second side of the PCB and spaced a predetermined distance from an edge of the PCB, the third antenna comprising a third positive branch and a third negative branch, the second side being opposite to the first side;

[0014] a second transmission line, comprising a feeder and a ground line, wherein one end of the feeder is connected to the positive electrode of the signal source, and the other end of the feeder is connected to the third positive branch; one end of the ground line is connected to the negative electrode of the signal source, and the other end of the ground line is connected to the third negative branch;

[0015] Under the feeding excitation of the signal source, the directional pattern of the third antenna is opposite to the directional pattern of the first antenna in the horizontal direction.

[0016] Preferably, there are multiple first antennas or multiple third antennas, and the overlap between the directional patterns of every two adjacent first antennas or the third antennas is not greater than a preset value.

[0017] Preferably, there are multiple second antennas, and the overlap between the directional patterns of any two adjacent second antennas is no greater than a preset value.

[0018] Preferably, the first antenna and the second antenna are both dipole antennas.

[0019] Preferably, the first transmission line is a coaxial feeder, the transmission line is the inner core of the coaxial feeder, and the ground line is the outer skin of the coaxial feeder.

[0020] Preferably, the first positive branch and the first negative branch are respectively distributed on both sides of the first transmission line.

[0021] In order to solve the above technical problems, the present application also provides an electronic device, including the high isolation antenna as described above.

[0022] The present application provides a high-isolation antenna, relating to the field of signal transmission. In this solution, the positive and negative branches of a first antenna are respectively connected to the positive and negative electrodes of a signal source via a feeder line and a ground line of a first transmission line, and are separated by a preset distance from a PCB board. This allows the ground plane of the PCB board to reflect the radiation of the first antenna, weakening the radiation of the first antenna in the direction close to the PCB board. In other words, the main radiation direction of the first antenna is away from the PCB board. A second antenna is provided on or at the edge of the PCB board, with a second positive branch directly connected to the positive electrode of the signal source and reusing the ground plane of the PCB board as a second negative branch. The negative branch is not shared with the first antenna. As a result, under the feed excitation of the signal source, the directional patterns of the two antennas are perpendicular in the horizontal direction, reducing the overlap of the directional patterns of the two antennas. This reduces the cross-radiation of the two antennas, thereby improving the isolation between the two antennas.

[0023] The present application also provides an electronic device having the same beneficial effects as the high isolation antenna described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0025] Figure 1 A schematic structural diagram of a high isolation antenna provided in this application;

[0026] Figure 2 is a schematic diagram of a dipole antenna in the prior art;

[0027] Figure 3 is the directivity pattern of the dipole antenna;

[0028] Figure 4 is a cross-sectional view of the directivity pattern of a dipole antenna;

[0029] Figure 5 The directional pattern when the first antenna provided in this application is a dipole antenna;

[0030] Figure 6 The corresponding directional patterns when the two dipole antennas provided in this application are respectively arranged on both sides of the PCB board;

[0031] Figure 7 Directional pattern of the dipole antenna provided in this application, which is located on or at the edge of the PCB board;

[0032] Figure 8The final radiation pattern of the high isolation antenna provided for this application;

[0033] Figure 9 Schematic diagram of antenna isolation in the prior art;

[0034] Figure 10 Schematic diagram of the isolation of the high isolation antenna in this application. DETAILED DESCRIPTION

[0035] The core of this application is to provide a high-isolation antenna and electronic device, which can reduce the overlap of the directional patterns of the two antennas, that is, reduce the radiation cross-talk of the two antennas, and thus improve the isolation between the two antennas.

[0036] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0037] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a high isolation antenna provided in this application, which includes:

[0038] A PCB (Printed Circuit Board) board, including a ground plane 11;

[0039] The first antenna is provided on a first side of the PCB board and has a preset distance from an edge of the PCB board. The first antenna includes a first positive branch 12 and a first negative branch 13.

[0040] A first transmission line 14 includes a feeder line and a ground line, wherein one end of the feeder line is connected to the positive electrode of the signal source, and the other end of the feeder line is connected to the first positive electrode branch 12; one end of the ground line is connected to the negative electrode of the signal source, and the other end of the ground line is connected to the first negative electrode branch 13;

[0041] The second antenna is provided on the PCB or at the edge of the PCB, and includes a second positive branch 15 connected to the positive electrode of the signal source, and the ground plane 11 of the PCB serves as the second negative branch of the second antenna;

[0042] Under the feeding excitation of the signal source, the directional pattern of the first antenna is perpendicular to the directional pattern of the second antenna in the horizontal direction.

[0043] Specifically, the concept of improving the isolation between the two antennas in this application is to adjust the directional patterns of the two antennas so that they do not overlap as much as possible, thereby improving the isolation between the two antennas. Furthermore, this application does not use feed orthogonality to make the directional patterns of the two antennas orthogonal in the horizontal and vertical directions. This is because if the directional patterns of the two antennas are orthogonal in the horizontal and vertical directions, if the two antennas use the same ground branch or ground plane 11, it is difficult to control the directional patterns to not overlap, and thus, good isolation cannot be achieved.

[0044] The PCB board in the present application can be a board on a terminal product (electronic device) to which the high-isolation antenna is applied. The ground plane 11 on this PCB board is used as the ground branch (i.e., the second negative branch) of one of the antennas. The first antenna is provided with a first positive branch 12 and a first negative branch 13, so that the first antenna and the second antenna do not share a common ground branch. Specifically, the first antenna is connected to the signal source via a first transmission line 14, specifically, the first positive branch 12 of the first antenna is connected to the positive electrode of the signal source via a feeder line, and the first negative branch 13 of the first antenna is connected to the negative electrode of the signal source via a ground line, and a preset distance is provided between the first antenna and the edge of the PCB board. At this time, when the first antenna is in operation, the ground plane 11 reflects the radiation generated by the first antenna, so that the radiation of the first antenna in the direction close to the ground plane 11 of the PCB board is weakened. At this time, the main radiation direction of the first antenna is located in the direction away from the PCB board, that is, the radiation pattern of the first antenna produces a concave point on the side of the ground plane 11 close to the PCB board. The second antenna's second positive branch 15 is directly connected to the positive terminal of the signal source and uses the PCB's ground plane 11 as its second negative branch. The second antenna is located on or at the edge of the PCB. The first and second antennas each have their own corresponding negative branches, and do not share a common negative branch. In this case, the second antenna generates a directional pattern perpendicular to that of the first antenna. This horizontally perpendicular directional pattern of the two antennas reduces overlap, thus reducing cross-radiation between the two antennas and improving isolation between them.

[0045] In a preferred embodiment, the first transmission line 14 is a coaxial feeder, the transmission line is the inner core of the coaxial feeder, and the ground line is the outer skin of the coaxial feeder.

[0046] This embodiment aims to provide a specific implementation method of the first transmission line 14, which can be but is not limited to a coaxial feeder. In this case, the inner core is connected to the positive electrode of the transmission line and the signal source, and the outer skin is connected to the ground wire and the negative electrode of the signal source.

[0047] Of course, the specific implementation of the first transmission line 14 is not limited to a coaxial feeder, and may be other implementations, which is not specifically limited in this application.

[0048] Furthermore, as a preferred embodiment, the first positive branch 12 and the first negative branch 13 are respectively located on both sides of the first transmission line 14 .

[0049] In a specific embodiment, the first positive branch 12 and the first negative branch 13 can be located on both sides of the first transmission line 14, respectively, but are not limited to this structure. The positive and negative branches of the antenna can be constructed as needed, as long as the first positive branch 12 is connected to the feeder line of the first transmission line 14, and the first negative branch 13 is connected to the ground line of the first transmission line 14.

[0050] As a preferred embodiment, the area of the ground plane 11 is not less than 1 / N of the wavelength of the working frequency band, and N is not greater than 4.

[0051] Specifically, to ensure that the ground plane 11 on the PCB effectively reflects the radiation generated by the first antenna, that is, to ensure that the radiation pattern of the first antenna is weakened in the direction close to the PCB, the area of the ground plane 11 on the PCB provided in this application should be sufficiently large. At least the area of the ground plane 11 should be no less than 1 / N times the wavelength of the operating frequency band, which is the operating frequency band of the designed first antenna. In one specific embodiment, the operating frequency band of the first antenna and the second antenna are the same.

[0052] The ground plane 11 may be a PCB ground or a ground plane 11 made of other metal alloys, etc., and this application does not make any special limitation here.

[0053] In addition, in the present application, the materials of the first positive electrode branch 12 and the second positive electrode branch 15 may be the same or different, and the present application does not limit this.

[0054] As a preferred embodiment, the PCB board is rectangular in shape.

[0055] As a preferred embodiment, the present invention further comprises:

[0056] a third antenna disposed on a second side of the PCB and spaced a predetermined distance from an edge of the PCB, the third antenna comprising a third positive branch and a third negative branch, the second side of the third antenna being opposite to the first side;

[0057] a second transmission line, comprising a feeder and a ground wire, wherein one end of the feeder is connected to the positive electrode of the signal source, the other end of the feeder is connected to the third positive electrode branch, one end of the ground wire is connected to the negative electrode of the signal source, and the other end of the ground wire is connected to the third negative electrode branch;

[0058] Under the feeding excitation of the signal source, the directional pattern of the third antenna is opposite to the directional pattern of the first antenna in the horizontal direction.

[0059] Furthermore, the number of antennas included in the high-isolation antenna in the present application is not limited to two. Specifically, a third antenna can be arranged on the second side opposite to the first side of the PCB board, wherein the third antenna is connected in the same manner as the first antenna, and the only difference from the first antenna is that it is arranged on the second side opposite to the first side. Therefore, the radiation pattern corresponding to the third antenna is also weakened in the direction close to the PCB board, that is, the radiation in the direction close to the first antenna is weakened, and its main radiation direction is the direction away from the PCB board. Therefore, the radiation pattern of the third antenna is opposite to that of the first antenna, so there is no overlap between the two radiation patterns, and the radiation pattern of the third antenna is perpendicular to that of the second antenna (the same as the corresponding relationship between the radiation patterns of the first antenna and the second antenna). Therefore, there is no overlap between the radiation patterns of the third antenna and the second antenna, and thus the three antennas can maintain good isolation.

[0060] As a preferred embodiment, there are multiple first antennas or third antennas, and the overlap between the directional patterns of every two adjacent first antennas or third antennas is no greater than a preset value.

[0061] Furthermore, when the area of the ground plane 11 of the PCB board is large enough, the first side and the second side of the PCB board can be provided with not only one first antenna or one second antenna, but the number of antennas can be adjusted according to actual needs. The specific number of antennas provided only needs to ensure that the overlap between the directional patterns of each two adjacent first antennas or the directional patterns of each two adjacent third antennas is within a preset value, so as to ensure the isolation between the antennas and the stability of the operation of the high-isolation antenna.

[0062] As a preferred embodiment, there are multiple second antennas, and the overlap between the directional patterns of two adjacent second antennas is no greater than a preset value.

[0063] Furthermore, the directional pattern of the second antenna is perpendicular to the directional pattern of the first antenna and the directional pattern of the third antenna, and the second antenna is arranged on or at the edge of the PCB board. When it is arranged on the PCB board, the radiation direction of the second antenna is weakened in the direction of the first side and the second side of the PCB board, that is, the main radiation direction of the second antenna extends outward along the direction of the third side or the fourth side of the PCB board, wherein the third side and the fourth side are opposite and are located between the first side and the second side.

[0064] When the number of the above-mentioned first antennas and third antennas can be multiple, as long as the area of the ground plane 11 of the PCB board is large enough (specifically, when the length of the third side or the fourth side is large enough), the number of corresponding second antennas can also be multiple, as long as the overlap between the directional patterns of each adjacent two second antennas is within a preset value, so as to ensure the isolation between the multiple second antennas and the stability of the operation of the high-isolation antenna.

[0065] Furthermore, as a preferred embodiment, if the selection and position of the second antenna causes the second antenna's directional pattern to be weakened not only in the directions of the first and second sides of the PCB, but also in the fourth side, that is, when the main radiation direction of the second antenna extends outward along the third side, a fourth antenna may also be included. The fourth antenna is connected in the same manner as the second antenna, and differs from the second antenna only in that the main radiation direction of the directional pattern is on the fourth side, opposite the third side. Therefore, the directional pattern corresponding to the fourth antenna is also weakened in the direction close to the third side of the PCB, that is, the radiation is weakened in the direction close to the second antenna, and its main radiation direction extends outward along the fourth side. Therefore, the directional pattern of the fourth antenna is opposite to that of the second antenna, and there is no overlap between the two directional patterns. The directional patterns of the first antenna and the third antenna are respectively perpendicular to the directional pattern of the second antenna. Therefore, there is no overlap between the directional patterns of the fourth antenna and the directional patterns of the first and third antennas, thereby maintaining good isolation between the four antennas.

[0066] Correspondingly, as long as the area of the ground plane 11 of the PCB board is large enough (specifically, when the length of the third side or the fourth side is large enough), the number of corresponding fourth antennas can also be multiple, as long as the overlap between the directional patterns of each two adjacent fourth antennas is within the preset value, so as to ensure the isolation between the multiple fourth antennas and ensure the stability of the operation of the high-isolation antenna.

[0067] As a preferred embodiment, the first antenna and the second antenna are both dipole antennas.

[0068] Furthermore, in a specific embodiment, the first antenna and the second antenna in the present application may both be dipole antennas, and correspondingly, the third antenna and the fourth antenna may also be dipole antennas.

[0069] Taking a dipole antenna as an example, a specific embodiment is provided and described as follows:

[0070] First, see Figure 2 , Figure 2 The figure is a schematic diagram of a dipole antenna in the prior art, which specifically includes a positive branch and a negative branch, which are respectively connected to a signal source and are located on both sides of the signal source.

[0071] See also Figure 3 and Figure 4 , Figure 3 is the directional pattern of the dipole antenna, Figure 4 A cross-sectional view of the dipole antenna's directional pattern. Figure 3 and Figure 4 is the radiation pattern corresponding to the standard dipole antenna.

[0072] See also Figure 5 , Figure 5 The directional pattern of the first antenna provided in this application is a dipole antenna. It can be seen that the positional relationship between the first antenna and the ground plane 11 provided in this application weakens the directional pattern of the dipole antenna in the direction close to the ground plane 11. At this time, the ground plane 11 has little effect on the main radiation direction of the dipole antenna, which is mainly determined by the positive and negative branches of the dipole antenna and the position of the antenna.

[0073] See also Figure 6 , Figure 6 The corresponding directional patterns of the two dipole antennas provided in this application are respectively set on both sides of the PCB board. It can be seen that if such dipole antennas are respectively set on the left and right sides of the PCB board, the radiation range of this antenna will cover the left and right sides of the electronic device, with a concave point in the middle. Figure 7 , Figure 7 The directional pattern of the dipole antenna provided in this application and disposed on or at the edge of a PCB board. It can be seen that if a dipole antenna is disposed on the ground plane 11 of the PCB board, and the positive branch of the dipole antenna (the second positive branch 15 of the second antenna) is disposed on or at the edge of the ground plane 11, and the negative branch is the ground plane 11 of the PCB board, the directional pattern of the second antenna is as shown in the figure. The directional pattern of the dipole antenna (the first antenna) is rotated 90 degrees. At this time, the antenna radiation direction is stronger in the top, bottom, front, and back of the PCB board, while concave points are formed on the left and right sides.

[0074] See also Figure 8 , Figure 8 This is the final directional pattern of the high isolation antenna provided in this application. There are two antennas (ie, two second antennas) on the ground plane 11, and the directional pattern formed at this time is as follows: Figure 8 ,It can be seen that the overlapping area of the ,directional patterns is small, so there is good isolation between ,the antennas.

[0075] See also Figure 9 and Figure 10 , Figure 9 Schematic diagram of antenna isolation in the prior art. Figure 10 This is a schematic diagram of the isolation of the high isolation antenna in this application. Figure 9 and Figure 10This is the isolation between two 2.4GHz antennas on the same electronic device, operating in the 2.4GHz to 2.5GHz frequency band. The prior art shows an isolation of approximately -20dB between two antennas. In this application, the isolation is approximately -27dB to -29dB, improving the isolation by 8-9dB.

[0076] In summary, the high isolation antenna in the present application can reduce the overlap of the directional patterns of the two antennas, that is, it can reduce the radiation crossover of the two antennas, thereby improving the isolation between the two antennas.

[0077] In order to solve the above technical problems, the present application also provides an electronic device, including the high isolation antenna as described above.

[0078] For an introduction to the electronic device, please refer to the above embodiments, and this application will not go into details here.

[0079] It should also be noted that, in this specification, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus comprising the element.

[0080] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present application. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A high isolation antenna, characterized in that: include: PCB board, including ground plane; a first antenna, disposed on a first side of the PCB and spaced a preset distance from an edge of the PCB, the first antenna comprising a first positive branch and a first negative branch; a first transmission line, comprising a feeder and a ground wire, wherein one end of the feeder is connected to the positive electrode of the signal source, and the other end of the feeder is connected to the first positive electrode branch; one end of the ground wire is connected to the negative electrode of the signal source, and the other end of the ground wire is connected to the first negative electrode branch; A second antenna is provided on the PCB or at an edge of the PCB, and includes a second positive branch connected to the positive electrode of the signal source, and the ground plane of the PCB serves as a second negative branch of the second antenna; Under the feeding excitation of the signal source, the directional pattern of the first antenna is perpendicular to the directional pattern of the second antenna in the horizontal direction.

2. The high isolation antenna according to claim 1, wherein: The area of the ground plane is not less than 1 / N of the wavelength of the working frequency band, and N is not greater than 4.

3. The high isolation antenna according to claim 1, wherein: The first antenna and the second antenna are both dipole antennas.

4. The high isolation antenna according to claim 1, wherein: The first transmission line is a coaxial feeder, the transmission line is the inner core of the coaxial feeder, and the ground line is the outer skin of the coaxial feeder.

5. The high isolation antenna according to claim 1, wherein: The first positive electrode branch and the first negative electrode branch are respectively located on two sides of the first transmission line.

6. The high isolation antenna according to any one of claims 1 to 5, characterized in that: Also includes: a third antenna disposed on a second side of the PCB and spaced a predetermined distance from an edge of the PCB, the third antenna comprising a third positive branch and a third negative branch, the second side being opposite to the first side; a second transmission line, comprising a feeder and a ground line, wherein one end of the feeder is connected to the positive electrode of the signal source, and the other end of the feeder is connected to the third positive branch; one end of the ground line is connected to the negative electrode of the signal source, and the other end of the ground line is connected to the third negative branch; Under the feeding excitation of the signal source, the directional pattern of the third antenna is opposite to the directional pattern of the first antenna in the horizontal direction.

7. The high isolation antenna according to claim 6, wherein: There are multiple first antennas or multiple third antennas, and the degree of overlap between the directional patterns of every two adjacent first antennas or the third antennas is no greater than a preset value.

8. The high isolation antenna according to claim 6, wherein: There are multiple second antennas, and the overlap between the directional patterns of two adjacent second antennas is no greater than a preset value.

9. An electronic device, characterized in that: The invention comprises the high isolation antenna according to any one of claims 1 to 8.

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