Antenna array and wireless device

Abstract

Disclosed are an antenna array and a wireless device. The antenna array includes N antenna elements and N branches, where N is an integer and N is greater than or equal to 2. In the antenna array, the N antenna elements are arranged rotationally symmetrically. One of the N branches is located between every two adjacent antenna elements in the N antenna elements. One end of each of the N branches is located at the geometric center of the N antenna elements. The N antenna elements are arranged rotationally symmetrically.

Description

[0001] This application claims priority to Chinese patent application No. 202110521298.0, filed on May 12, 2021, and entitled “An Array Antenna,” the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of antenna technology, and in particular to an antenna array and a wireless device. Background Art

[0003] In scenarios such as indoor environments, ceiling antennas are usually used, that is, signal coverage is achieved by distributing multiple antennas at different locations on the floor of the wireless access point (AP). In order to achieve coverage in all directions without dead angles, the ceiling antenna is required to have a small out-of-roundness (radiation pattern un-roundness), that is, the gain in each direction on the horizontal plane covered by the ceiling antenna is close to uniform. Alternatively, out-of-roundness can be understood as the gain difference between the maximum gain and the minimum gain of the antenna array on the horizontal plane corresponding to the same pitch angle. The larger the difference, the more out-of-round it is. Generally, the antenna located at the center of the floor has a smaller out-of-roundness, while the antenna located at a non-center position of the floor has a more dispersed distribution of current on the floor due to the asymmetric structure of the floor, which in turn leads to a larger out-of-roundness of the antenna located at a non-center position of the floor. Summary of the Invention

[0004] The present application provides an antenna array and a wireless device for improving the out-of-roundness of the antenna array.

[0005] In a first aspect, an antenna array is provided, comprising N antenna elements and N branches, where N ≥ 2 and N is an integer. In the antenna array, the N antenna elements are arranged rotationally symmetrically, and one of the N branches is located between every two adjacent antenna elements in the N antenna elements. Furthermore, one end of each of the N branches is located at the geometric center of the N antenna elements, and the N antenna elements are arranged rotationally symmetrically.

[0006] These N branches can adjust the distribution of the current generated by the antenna array on the floor, so that the floor current gradually shrinks and is evenly distributed around the antenna array.

[0007] In some optional examples, the length of each of the N branches is equal, and the length of each branch is between 0.25λ and 0.75λ, where λ is the wavelength of the electromagnetic wave corresponding to the working frequency band of the antenna array. It should be noted that the described range of 0.25λ to 0.75λ can be understood to include both the values ​​of the two endpoints and any value between the two endpoints. For example, the length of each branch can be 0.25λ, or 0.45λ, 0.5λ, 0.6λ, or 0.75λ, etc., which are not limited here. In the above manner, by setting the length of each branch to be equal, the current in the floor can be gradually evenly distributed around the antenna array.

[0008] In some optional examples, the antenna array may further include a dielectric substrate, and the N antenna units may be arranged on the dielectric substrate.

[0009] In some optional examples, each branch includes only one segment.

[0010] In some optional examples, each branch may include at least two unconnected segments, the sum of the lengths of the at least two unconnected segments meeting the aforementioned length range.

[0011] In some optional examples, the antenna array may further include a floor, and the distance between the plane where the N antenna units are located and the floor is greater than 0. For example, if the antenna units are disposed on a dielectric substrate, the distance between the dielectric substrate and the floor is also greater than or equal to zero.

[0012] In some optional examples, the antenna array may further include a power distribution network, wherein one end of each of the N antenna elements is connected to one end of the power distribution network, and the other end of the power distribution network is connected to each other at the geometric center of the N antenna elements.

[0013] In some optional examples, the antenna array is a horizontally polarized antenna array. The N branches hardly affect the distribution of radiation currents of the N antenna units, thus maintaining horizontally polarized radiation.

[0014] In some optional examples, each of the N antenna units mentioned above is a dipole antenna unit or a loop antenna unit.

[0015] In some optional examples, the antenna array further includes a radome, and the radome covers the antenna array.

[0016] In a second aspect, an embodiment of the present application provides a wireless device, comprising a radio frequency circuit and an antenna array as described in the first aspect and any possible implementation of the first aspect. The radio frequency circuit uses the antenna array to transmit and receive wireless signals. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1A A schematic diagram of a signal coverage scenario provided by this embodiment;

[0019] Figure 1B A schematic diagram of the center and non-center positions of the floor;

[0020] Figure 1C A schematic diagram of a structure of a horizontally polarized antenna array in an existing solution;

[0021] Figure 1D is a schematic diagram of the distribution of floor current when using an existing horizontally polarized antenna array;

[0022] Figure 2 A schematic diagram of the structure of an antenna array provided in an embodiment of the present application;

[0023] Figure 3 Another structural diagram of the antenna array provided in an embodiment of the present application;

[0024] Figure 4 Another structural diagram of the antenna array provided in an embodiment of the present application;

[0025] Figure 5 Another structural diagram of the antenna array provided in an embodiment of the present application;

[0026] Figure 6 Another structural diagram of the antenna array provided in an embodiment of the present application;

[0027] Figure 7 Another structural diagram of the antenna array provided in an embodiment of the present application;

[0028] Figure 8 Another structural diagram of the antenna array provided in an embodiment of the present application;

[0029] Figure 9A Schematic diagram comparing the out-of-roundness of an existing antenna array and the out-of-roundness of the antenna array of the present application;

[0030] Figure 9B A schematic diagram showing changes in the distribution of current on the floor when using the existing antenna array and the antenna array of the present application;

[0031] Figure 9C Schematic diagram of the non-circularity of the antenna array of this application. DETAILED DESCRIPTION

[0032] Embodiments of the present application provide an antenna array and a wireless device for improving the out-of-roundness of the antenna array.

[0033] In indoor environments, a ceiling antenna array is usually used, that is, multiple antennas are distributed at different locations on the floor 103 (ground plane) of the wireless access point to achieve signal coverage. Figure 1A , is a schematic diagram of a signal coverage scenario provided by this embodiment. Figure 1A As shown, in order to achieve coverage in all directions without blind spots, the gain in each direction on the horizontal plane covered by the ceiling antenna array (such as the elliptical part shown in gray) needs to be close to uniform, so that the ceiling antenna array will have a smaller out-of-roundness (radiation pattern un-roundness), thereby ensuring that terminal devices located at different positions of the ceiling antenna array can receive stable signals. The described out-of-roundness can be understood as the gain difference between the maximum gain and the minimum gain of the antenna array on the horizontal plane corresponding to the same pitch angle. The smaller the difference, the smaller the out-of-roundness of the antenna array, and further the more round it is.

[0034] However, the antenna array is set at different positions on the floor 103, and its out-of-roundness will vary. For details, please refer to the following Table 1:

[0035] Table 1

[0036] Antenna array type Central location Edge Location Corner location Corner limit position Jump amplitude AP7052DE 2.9dB 5.1dB 6.5dB 10.3dB 7.4dB AirEngine8760-X1-PRO 2.0dB 5.8dB 6.5dB 8.0dB 6.0dB

[0037] The antenna arrays mentioned above are the AP7052DE and AirEngine8760-X1-PRO, two different models from Huawei. Table 1 shows that the non-circularity of the AP7052DE antenna array varies significantly when it is located at the center and non-center locations of floor 103. For example, the non-circularity of the antenna array located at the center is 2.9 dB, while that of the antenna array located at the edge is 5.1 dB, a difference of 2.2 dB. Furthermore, the non-circularity of the antenna array located at the corner is 6.5 dB, a 3.6 dB difference from the non-circularity of the antenna array located at the center, representing a significant variation. The non-circularity of the antenna array located at the extreme corner is 10.3 dB, and the difference between the non-circularity of the antenna array located at the center, or the jump amplitude shown in the last column, is 7.4 dB, representing a significant variation. Similarly, the AirEngine8760-X1-PRO can also be understood by referring to the existing AP7052DE antenna array mentioned above, and is not further explained here.

[0038] It is obvious that when the antenna arrays of the above two types are set at non-center positions on the floor, the non-circularity is larger.

[0039] The center position can be understood as the geometric center of the floor 103. The non-center position can be understood as other positions other than the center position of the floor 103, such as the edge position, corner position, corner extreme position, etc., which are not limited here. Figure 1B Understand. Figure 1B As shown, if the floor 103 is square, it can be divided into nine squares. The center of the nine squares is considered the center of the floor 103, and the squares on each side are considered the edges of the floor 103. The four corners of the nine squares are considered the corners of the floor 103. Furthermore, the extreme edge positions of the four corner squares are called the extreme corner positions of the floor 103.

[0040] It should be noted that in actual application, the center position and non-center position of the floor 103 are not limited to the above-mentioned nine-square grid division method, and no limitation is given here.

[0041] To further understand the formation and variation principle of the non-circularity of the antenna array, we can understand it through the distribution of current in the floor 103. Figure 1C A schematic diagram of the structure of an existing horizontally polarized antenna array is shown, and Figure 1D FIG1 shows a schematic diagram of the change in the current amplitude of the floor 103 when using the existing horizontally polarized antenna array. Figure 1CIt can be seen that the existing horizontally polarized antenna array only includes an antenna element 101 and a power distribution network 102. Figure 1C When the antenna array is placed at a non-central position of the floor 103, Figure 1D It can be seen that the distribution of the current in the floor 103 is relatively dispersed and not uniformly distributed around the antenna array. Therefore, it can be understood that the antenna array has a large degree of non-circularity.

[0042] In order to improve the out-of-roundness of the horizontally polarized antenna array placed at a non-center position of the floor 103, an embodiment of the present application provides an antenna array. The antenna array can be applied to a wireless device, which also includes a radio frequency circuit, and the radio frequency circuit uses the antenna array to transmit and receive wireless signals. For example, the wireless device can be a terminal device, a wireless access network device, etc., which is not specifically limited in this application. The wireless access network device described can be a base station, a wireless access point (AP), etc. The terminal device can be a user equipment (UE), a mobile station (MS), a mobile terminal (mobile terminal), a computer, etc. For example, the terminal device can be a mobile phone (or so-called "cellular" phone), a mobile computer, a computer with a mobile terminal, a smart watch, a mobile device mounted on a vehicle, etc.

[0043] The structure of the antenna array provided in the embodiment of the present application is described below.

[0044] Figure 2 This is a structural diagram of the antenna array provided in an embodiment of the present application.

[0045] See also Figure 2 The antenna array provided in the embodiment of the present application includes N antenna units 101 and N branches 104, where N ≥ 2 and N is an integer. The N antenna units 101 are arranged rotationally symmetrically, one of the N branches 104 is located between every two adjacent antenna units 101, and one end of each of the N branches 104 is located at the geometric center of the N antenna units 101. The N branches 104 are arranged rotationally symmetrically.

[0046] From the aforementioned Figure 1C and Figure 1DIt can be seen that when the existing horizontally polarized antenna array is placed at a non-center position of the floor 103, the process of the current in the floor 103 diffusing outward from the central electric field tends to gradually weaken, and the rate of weakening is relatively slow. The slower the outward diffusion rate, the more dispersed the current in the floor 103 is, and it cannot be concentrated around the antenna array, resulting in a large out-of-roundness of the existing horizontally polarized antenna array. Therefore, it is necessary to add an additional branch 104 to the existing horizontally polarized antenna array, while the branch 104 does not affect the normal operation of the original antenna unit 101. In other words, in order to improve the out-of-roundness of the horizontally polarized antenna array at a non-center position of the floor 103, a branch 104 can be added to the existing horizontally polarized antenna array so that the branch 104 can adjust the distribution of the current generated by the antenna array on the floor 103. In this way, as the current of the adjusted floor 103 diffuses outward from the central electric field, it not only tends to gradually weaken, but also weakens faster, gradually concentrating the current of the floor 103 and evenly distributing it around the antenna array, thereby improving the roundness.

[0047] Specifically, the antenna array includes N antenna units 101 and N branches 104. The number of branches 104 is the same as the number of antenna units 101. The specific number is not limited, as long as N is an integer greater than or equal to 2. For example, if the antenna array has 3 antenna units 101, then 3 new branches 104 are added; similarly, if the antenna array has 4 antenna units 101, then 4 new branches 104 are added. The specific number is not limited here. In addition, the N antenna units 101 are arranged rotationally symmetrically, and one of the N branches 104 is located between every two adjacent antenna units 101, and one end of each branch 104 is at the geometric center of the N antenna units 101. The N branches 104 are arranged rotationally symmetrically. In other words, by arranging N antenna units 101 in a rotationally symmetrical ring and loading each antenna unit 101 rotationally symmetrically, a branch 104 will be added at the geometric center of these N antenna units 101, thereby making these N branches 104 also present a rotationally symmetrical arrangement.

[0048] Since the out-of-roundness of the antenna array is affected by the current of the floor 103, the newly added N branches 104 for adjusting the distribution of the current of the floor 103 cannot affect the distribution of the radiation current of the N antenna units 101. Figure 2As shown, N branches 104 can be added between the N antenna units 101. At any time, since the current direction a on the N branches 104 and the direction b of the radiation current on the N antenna units 101 are almost perpendicular to each other, the radiation current of the N antenna units 101 is not affected. At the same time, the newly added N branches 104 can adjust the distribution of the current generated by the antenna array on the floor 103, and further adjust the out-of-roundness of the antenna array to a smaller value. In addition, as long as the length of the N branches 104 meets the numerical range shown in this application (refer to the subsequent content), the current of the floor 103 can be spread outward in a concentric circle at a faster speed, and very concentratedly adjusted to be distributed directly below the geometric center of the N antenna units 101.

[0049] In some optional examples, each antenna unit 101 in the N antenna units 101 may be a dipole antenna unit or a loop antenna unit. Figure 2 The following description is based on the example of each antenna unit 101 being a dipole antenna unit. In practical applications, other types of antenna units may also be included, which are not specifically limited in this application. In addition, the antenna array may be a horizontally polarized antenna array.

[0050] It should be noted that the aforementioned Figure 2 Taking N=4 as an example, a structure of an antenna array provided in this application is described. This structure is merely a schematic description. In practical applications, an antenna array consisting of three antenna units 101 and three branches 104, or another antenna array consisting of five antenna units 101 and five branches 104, may also be included, and the specific details are not limited in this application.

[0051] For example, see also Figure 3 , is another structural diagram of the antenna array provided in this application. Figure 3 As can be seen, the antenna array may include three antenna elements 101 and three branches 104, and these three antenna elements 101 and the three branches 104 are arranged rotationally symmetrically. Moreover, one of the three branches 104 is located between every two adjacent antenna elements 101, and one end of each of the three branches 104 is located at the geometric center of the three antenna elements 101.

[0052] In some optional embodiments, the length of each branch 104 in the N branches 104 is equal, and the length of each branch 104 is between 0.25λ and 0.75λ, where λ is the wavelength of the electromagnetic wave corresponding to the operating frequency band of the antenna array.

[0053] Whether the current of the floor 103 is evenly distributed around the antenna array is related to the length of each of the N branches 104. Therefore, to ensure that the current of the floor 103 is evenly distributed when each branch 104 is enabled, each of the N branches 104 can be set to have an equal length.

[0054] The length of each branch 104 is between 0.25λ and 0.75λ. For example, the length of each branch 104 can be 0.25λ, 0.35λ, 0.5λ, or 0.75λ, etc. λ is the wavelength of the electromagnetic wave corresponding to the operating frequency band of the antenna array.

[0055] See Figure 4 , is another structural schematic diagram of the antenna array provided in an embodiment of the present application.

[0056] like Figure 4 As shown in the aforementioned Figure 2 or Figure 3 Based on the illustrated embodiment, the antenna array further includes a dielectric substrate 105 , and N antenna units 101 are disposed on the dielectric substrate 105 .

[0057] In this example, the dielectric substrate 105 can be used to support N antenna units 101. The shape of the dielectric substrate 105 can be circular, rectangular, etc. In this application, only the dielectric substrate 105 with a circular shape is used as an example for description. The N antenna units 101 described can refer to the aforementioned Figure 2 The content described above is understood and will not be elaborated here.

[0058] Furthermore, when the antenna array also includes a dielectric substrate 105, λ can be the wavelength of electromagnetic waves corresponding to the antenna array's operating frequency band in the dielectric substrate 105. For example, the length of each branch 104 can be 0.5λ. By setting the length of each branch 104 to half the wavelength of electromagnetic waves corresponding to the antenna array's operating frequency band in the dielectric substrate 105, the antenna array can be reduced in size and cost, while also achieving improved performance.

[0059] In other embodiments, each of the N branches 104 mentioned above may have a different structure. Generally, there are two situations:

[0060] (1) Each branch 104 only includes one section. In other words, each branch 104 in the N branches 104 is composed of only one section of unbroken branches, and the shape of this section of unbroken branches can be rectangular, etc. For details, please refer to the aforementioned Figure 2-Figure 4The structure shown in FIG is understood for simplicity and will not be described in detail here.

[0061] (2) Each branch 104 includes at least two unconnected segments.

[0062] For details, please refer to Figure 5 , is another structural diagram of the antenna array provided in this application. Figure 5 As shown, each branch 104 includes a segment a branch 1041 and a segment b branch 1041 that are not connected, wherein the segment a branch 1041 and the segment b branch 1041 are not connected. In other words, the segment a branch 1041 and the segment b branch 1041 are spaced a certain distance apart.

[0063] It should be noted that, in the above-mentioned at least two unconnected segments, the sum of the lengths of the at least two unconnected segments should also satisfy the above-mentioned Figure 2 and Figure 4 The length range of the branch 104 described in . For example, the sum of the lengths of the branch 1041 of segment a and the branch 1041 of segment b should be between 0.25λ and 0.75λ, or should be 0.5λ.

[0064] in addition, Figure 5 The structure of each of the N branches 104 is described using only two unconnected branches 1041 (i.e., branch a 1041 and branch b 1041) as an example. In practical applications, each branch 104 may also be composed of three unconnected branches 1041, or four unconnected branches 1041, etc., which is not limited in this application.

[0065] It should be understood that, in addition to the two structures mentioned above, each branch 104 may have other structures in actual applications, which are not limited here.

[0066] See Figure 6 , is another structural schematic diagram of the antenna array provided in an embodiment of the present application.

[0067] like Figure 6 As shown in the aforementioned Figure 2-Figure 5 Based on the illustrated embodiment, the antenna array further includes a floor 103 , and the distance between the plane where the N antenna units 101 are located and the floor 103 is greater than zero.

[0068] Preferably, the distance may include but is not limited to 15 mm. In addition, when N antenna units 101 are arranged Figure 4In the case of the dielectric substrate 105 shown, the distance between the dielectric substrate 105 and the floor 103 can also be greater than or equal to zero. For example, the N antenna elements 101 are arranged on one side of the dielectric substrate 105, and the floor 103 is arranged on the other side of the dielectric substrate 105. In this way, the distance between the dielectric substrate 105 and the floor 103 is zero, while the distance between the plane where the N antenna elements 101 are located and the floor 103 is greater than zero. Furthermore, the floor 103 mentioned here can be understood to be a floor 103 made of metal materials, a floor 103 made of metamaterials, etc., and this is not limited here.

[0069] In some optional embodiments, in the aforementioned Figure 2-Figure 6 Based on the antenna array described above, the antenna array may further include a power distribution network 102 for transmitting the signals radiated by the N antenna units 101. Figure 7 , is another structural diagram of the antenna array provided in this application. Figure 7 It can be seen that the antenna array also includes a power distribution network 102, wherein one end of each antenna unit 101 in the N antenna units 101 is connected to one end of the power distribution network 102, and the other end of the power distribution network 102 is connected to each other at the geometric center of the N antenna units 101.

[0070] In some other optional embodiments, in the aforementioned Figure 2-Figure 7 Based on the antenna array described above, the antenna array may further include: Figure 8 The antenna cover 106 shown can cover the antenna array and prevent foreign matter such as dust particles from entering the antenna array.

[0071] above Figure 2-Figure 8 The structural diagram of the antenna array loaded with N branches 104 is mainly described in order to more intuitively understand the out-of-roundness of the antenna array before and after the addition of N branches 104 . Figure 9A A schematic diagram comparing the non-circularity of an existing antenna array and the non-circularity of the antenna array of the present application is shown.

[0072] from Figure 9A It can be seen that curve 1 is not centrally symmetrical, indicating that the antenna array without the N branches 104 has a larger non-circularity. Curve 2, on the other hand, is approximately centrally symmetrical, indicating that the antenna array with the N branches 104 has a smaller non-circularity than the antenna array without the N branches 104.

[0073] In addition, the difference in the out-of-roundness before and after adding N branches 104 to the antenna array can be understood by combining the aforementioned Table 1 with the following Table 2. The described Table 2 is as follows:

[0074] Table 2

[0075] Antenna array type Central location Edge Location Corner location Corner limit position Jump amplitude AP7052DE 2.9dB 5.1dB 6.5dB 10.3dB 7.4dB AirEngine8760-X1-PRO 2.0dB 5.8dB 6.5dB 8.0dB 6.0dB Antenna array of this application 2.2dB 3.5dB 4.4dB 4.8dB 2.6dB

[0076] As can be seen from Table 2 above, there is no significant difference in the non-circularity between the antenna array of the present application being located at the center and non-center locations of floor 103. For example, the non-circularity of the antenna array of the present application located at the center is 2.2 dB, while the non-circularity of the antenna array of the present application located at the edge is 3.5 dB, a difference of 1.3 dB. Furthermore, the non-circularity of the antenna array located at the corner is 4.4 dB, which is only 2.2 dB different from the non-circularity of the antenna array located at the center. The non-circularity of the antenna array located at the extreme corner is 4.8 dB, which is only 2.6 dB different from the non-circularity of the antenna array located at the center.

[0077] In other words, after the antenna array is increased with N branches 104, the difference between the out-of-roundness of the antenna array when it is placed at the center of the floor 103 and when it is placed at a non-center position is greatly reduced. Figure 9A Schematic diagram shown for understanding.

[0078] Furthermore, in order to more intuitively understand the above Figure 9A The reasons for the differences in the non-circularity shown are explained below based on the current distribution angles of the corresponding floor panels 103 when N branches 104 are not added and when N branches 104 are added.

[0079] See Figure 9B , is a schematic diagram showing the change in current distribution on the floor 103 when using the existing antenna array and the antenna array of the present application.

[0080] from Figure 9B It can be seen that the current distribution of the floor 103 shown in part (a) is generated when N branches 104 are not added to the existing antenna array. Obviously, from the current distribution of the floor 103 shown in part (a), it can be seen that the current distribution of the floor 103 shows a concentric circle trend. However, when the phases are consistent, it can be seen from the spacing between the dotted circle 90, the dotted circle 60, and the dotted circle 30 that it takes a long time for the current to diffuse from the position of the dotted circle 90 to the position of the dotted circle 60 and the position of the dotted circle 30, reflecting that the current of the floor 103 diffuses outward from the central electric field at a slow speed. This further illustrates that when N branches 104 are not added, the distribution of the current of the floor 103 is more dispersed and is not concentrated around the antenna array, resulting in a large non-circularity.

[0081] Then, the antenna array is increased to meet the above Figure 2 or Figure 4After adding N branches 104 within the described range, the current distribution of floor 103 shown in part (b) shows that while the current in floor 103 gradually converges around the antenna array, the current in floor 103 does not exhibit a uniform distribution similar to concentric circles, as can be seen from dashed circles 90, 60, and 30. This indicates that the out-of-roundness of the antenna array is still quite large. However, it can be demonstrated that the addition of N branches 104 can gradually reduce the out-of-roundness of the antenna array by adjusting the current distribution in floor 103.

[0082] Therefore, based on the current distribution shown in part (b), when the lengths of the N branches 104 are further adjusted to a target value (e.g., 0.5λ), the current distribution of the corresponding floor 103 can be understood by referring to part (c). The current distribution of floor 103 shown in part (c) shows that it exhibits a concentric circular pattern. Furthermore, compared to the current distribution shown in part (a), the spacing between the dotted circles 90, 60, and 30 in part (c) indicates that, when the phases are aligned, the current takes less time to diffuse from dotted circle 90 to dotted circle 60 and 30, indicating that the current in floor 103 diffuses outward from the central electric field more quickly. Furthermore, the faster the diffusion rate, the more concentrated the current in floor 103 is, distributed directly below the geometric center of the antenna array, resulting in a smaller out-of-roundness. Therefore, when N branches 104 with a target length are added, the out-of-roundness of the antenna array is minimized.

[0083] Also, see Figure 9C , is a schematic diagram of the non-circularity of the antenna array of this application. Figure 9C It can be seen that after adding N branches 104 to the antenna array, the main polarization of the antenna array is still horizontal (as shown by curve a), and the cross-polarization ratio remains good (as shown by curve b). In short, the addition of N branches 104 does not affect the normal operation of the N antenna units 101 while adjusting the current distribution of the floor 103 to improve the out-of-roundness of the antenna array.

[0084] In summary, compared to an antenna array without the additional N branches 104, the antenna array provided in the embodiment of the present application includes N branches 104. These N branches 104 can adjust the distribution of the current generated by the antenna array on the floor 103 without affecting the distribution of the radiation current of the N antenna units 101. This allows the current distribution on the floor 103 to spread outward in a concentric circle at a relatively fast rate and gradually converge to be distributed directly below the geometric center of the antenna array, ultimately improving the out-of-roundness of the antenna array when placed in a non-central position on the floor 103. At the same time, the antenna array does not experience a change in cross-polarization isolation and always maintains horizontally polarized radiation.

[0085] The antenna array and wireless device provided in the embodiments of the present application are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for those skilled in the art, according to the ideas of the present application, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present application.

Claims

1. An antenna array, characterized in that: The antenna array includes N antenna units, N branches and a floor, where N is greater than or equal to 2 and N is an integer; The N antenna units are arranged rotationally symmetrically, one of the N branches is located between every two adjacent antenna units among the N antenna units, one end of each of the N branches is located at the geometric center of the N antenna units, the N branches are arranged rotationally symmetrically, and the N branches are used to adjust the current distribution generated by the N antenna units on the floor.

2. The antenna array according to claim 1, wherein the length of each of the N branches is equal, and the length of each branch is between 0.25λ and 0.75λ, wherein: λ is the wavelength of the electromagnetic wave corresponding to the operating frequency band of the antenna array.

3. The antenna array according to claim 2, wherein the length of each branch is 0.5λ.

4. The antenna array according to claim 2 or 3, further comprising a dielectric substrate, the N antenna units being arranged on the dielectric substrate, and λ being a wavelength of electromagnetic waves corresponding to an operating frequency band of the antenna array in the dielectric substrate. 5 . The antenna array according to claim 1 , wherein each of the branches comprises at least two unconnected segments. 6 . The antenna array according to claim 1 , wherein the distance between the plane where the N antenna units are located and the floor is greater than zero.

7. The antenna array according to any one of claims 1 to 3, further comprising a power distribution network, wherein one end of each of the N antenna units is connected to one end of the power distribution network, and the other end of the power distribution network is connected to each other at the geometric center of the N antenna units.

8. The antenna array according to any one of claims 1 to 3, wherein the antenna array is a horizontally polarized antenna array. 9 . The antenna array according to claim 1 , wherein each of the N antenna units is a dipole antenna unit or a loop antenna unit. 10 . The antenna array according to claim 1 , further comprising a radome covering the antenna array.

11. A wireless device, characterized in that: The invention comprises a radio frequency circuit and an antenna array according to any one of claims 1 to 10, wherein the radio frequency circuit uses the antenna array to transmit and receive wireless signals.

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