An antenna system

Abstract

The embodiment of the present application discloses an antenna system for improving the isolation between two antenna arrays. It comprises a first antenna array and a second antenna array. The interval between two adjacent rows of antenna elements in the target direction of the first antenna array is determined according to the phase difference and wavelength of the feeding phase of the two adjacent rows of antenna elements in the target direction of the first antenna array. The interval between two adjacent rows of antenna elements in the target direction of the second antenna array is determined according to the phase difference and wavelength of the feeding phase of the two adjacent rows of antenna elements in the target direction of the second antenna array.

Description

Technical Field

[0001] This application relates to the field of communications, and more particularly to an antenna system. Background Technology

[0002] With the large-scale commercialization of multi-input multi-output (MIMO) technology, the integrated access backhaul (IAB) node solution has been proposed. This solution is used to extend the coverage of macro base stations and fill blind spots, maximizing the capacity potential and spectrum value of MIMO. An IAB node consists of a mobile termination (MT) antenna and a distributed unit (DU) antenna. The MT antenna communicates with the macro base station, while the DU antenna communicates with the user equipment (UE). Traditional IAB nodes operate in frequency division duplex (FDM) or time division duplex (TDM) modes due to the low isolation between the MT and DU antennas, resulting in wasted spectrum or time slot resources. To ensure that the IAB node operates within the same frequency band, with the MT antenna receiving signals from the macro base station while the DU antenna transmits signals to the UE, and vice versa, interference between the two antennas must be reduced.

[0003] In existing technologies, interference between antennas is reduced by setting up two metal fences to enclose the MT antenna and the DU antenna respectively, and by placing a metal bar array between the two metal fences. However, the aforementioned metal fences are often quite tall, and the metal bar array also occupies a lot of space, affecting the design of other parts of the IAB node. Summary of the Invention

[0004] This application provides an antenna system for improving the isolation between an MT antenna and a DU antenna.

[0005] The first aspect of this application provides an antenna system:

[0006] The system includes a first antenna array and a second antenna array, with the first antenna array positioned on a first side and the second antenna array positioned on a second side. The spacing between two adjacent rows of antenna elements in the first antenna array along the target direction is determined based on the phase difference and wavelength of the feed to these two adjacent rows of antenna elements in the first antenna array along the target direction. Similarly, the spacing between two adjacent rows of antenna elements in the second antenna array along the target direction is determined based on the phase difference and wavelength of the feed to these two adjacent rows of antenna elements in the second antenna array along the target direction. The target direction points from the first side to the second side, and the wavelength corresponds to the operating frequency band of both the first and second antenna arrays.

[0007] In this application, by setting the spacing between two adjacent rows of antenna elements in the target direction of the first antenna array and the second antenna array in the above manner, interference signals transmitted from the first antenna to the second antenna array and interference signals transmitted from the second antenna to the first antenna array can be suppressed. Thus, there is no need to set up additional metal fences and metal strip arrays, and good isolation between the first antenna array and the second antenna array can be obtained.

[0008] In one possible implementation, if the main beam generated by the first antenna array does not deflect relative to the direction of the vertical array surface, the spacing between two adjacent rows of antenna elements in the target direction of the first antenna array is half a wavelength.

[0009] In one possible implementation, if the main beam generated by the first antenna array is deflected to a first side relative to the direction perpendicular to the array face, then the spacing between two adjacent rows of antenna elements in the target direction is less than half a wavelength. Alternatively, if the main beam generated by the first antenna array is deflected to a second side relative to the direction perpendicular to the array face, then the spacing between two adjacent rows of antenna elements in the target direction is greater than half a wavelength.

[0010] In one possible implementation, if the main beam generated by the first antenna array is biased towards the first side relative to the direction perpendicular to the array surface, then the spacing d between two adjacent rows of antenna elements in the target direction of the first antenna array... a satisfy Where δ a Let λ be the phase difference between the feeds of two adjacent rows of antenna elements in the first antenna array along the target direction, and λ be the wavelength. Alternatively, if the main beam generated by the first antenna array is deflected to the second side, then d... a satisfy

[0011] In one possible implementation, if the main beam generated by the second linear array does not deflect relative to the direction of the vertical array surface, then the spacing between two adjacent rows of antenna elements in the target direction of the second linear array is half a wavelength.

[0012] In one possible implementation, if the main beam generated by the second linear array is biased towards the first side relative to the direction perpendicular to the array face, then the spacing between two adjacent rows of antenna elements in the target direction of the second linear array is greater than half a wavelength. Alternatively, if the main beam generated by the second linear array is biased towards the second side relative to the direction perpendicular to the array face, then the spacing between two adjacent rows of antenna elements in the target direction of the second linear array is less than half a wavelength.

[0013] In one possible implementation, if the main beam generated by the second linear array is biased towards the first side relative to the direction perpendicular to the array surface, then the spacing d between two adjacent rows of antenna elements of the second linear array in the target direction is... b satisfy Where δ b The phase difference between the feeds of two adjacent rows of antenna elements in the second linear array in the target direction. Alternatively, if the main beam generated by the second linear array is offset to the second side relative to the direction perpendicular to the array surface, then the spacing d between two adjacent rows of antenna elements in the target direction of the second linear array is... b satisfy

[0014] In one possible implementation, if the first antenna array includes M rows of antenna elements in the target direction, the excitation voltage amplitude of the M rows of antenna elements first increases and then decreases in the target direction; if the second antenna array includes N rows of antenna elements in the target direction, the excitation voltage amplitude of the N rows of antenna elements first increases and then decreases in the target direction.

[0015] In one possible implementation, the ratio of the excitation voltage amplitudes of the M rows of antenna elements in the first antenna array is, in the target direction, successively: The ratio of the excitation voltage amplitudes of the N rows of antenna elements in the second antenna array is as follows in the target direction:

[0016] In one possible implementation, if the first antenna array includes M rows of antenna elements in the target direction, then the sum of the excitation voltage amplitudes of the odd-numbered rows of antenna elements in the M rows is equal to the sum of the excitation voltage amplitudes of the even-numbered rows of antenna elements in the M rows. If the second antenna array includes N rows of antenna elements in the target direction, then the sum of the excitation voltage amplitudes of the odd-numbered rows of antenna elements in the N rows is equal to the sum of the excitation voltage amplitudes of the even-numbered rows of antenna elements in the N rows.

[0017] In one possible implementation, the first side is the top side and the second side is the bottom side. Alternatively, the first side is the left side and the second side is the right side.

[0018] A second aspect of this application provides an antenna system:

[0019] The system includes a first antenna array and a second antenna array, which are respectively located on a first side and a second side. The first antenna array includes one row of antenna elements in the target direction. The spacing between two adjacent rows of antenna elements in the second antenna array in the target direction is determined based on the phase difference and wavelength of the feed to the two adjacent rows of antenna elements in the second antenna array in the target direction. The target direction points from the first side to the second side, and the wavelength corresponds to the operating frequency band of the first antenna array and the second antenna array.

[0020] In this application, by setting the spacing between two adjacent rows of antenna elements in the target direction of the second antenna array in the above manner, interference signals transmitted in the direction of the second antenna array and the direction of the first antenna array can be suppressed, so that there is no need to set up additional metal fences and metal strip arrays, and good isolation between the first antenna array and the second antenna array can be obtained.

[0021] In one possible implementation, if the main beam generated by the second linear array does not deflect relative to the direction of the vertical array surface, then the spacing between two adjacent rows of antenna elements in the target direction of the second linear array is half a wavelength.

[0022] In one possible implementation, if the second antenna array is positioned on the first side, and the main beam generated by the second antenna array is biased towards the first side relative to the direction perpendicular to the array surface, then the spacing between two adjacent rows of antenna elements in the second antenna array in the target direction is less than half a wavelength. Alternatively, if the second antenna array is positioned on the first side, and the main beam generated by the second antenna array is biased towards the second side relative to the direction perpendicular to the array surface, then the spacing between two adjacent rows of antenna elements in the target direction is greater than half a wavelength.

[0023] In one possible implementation, if the second antenna array is positioned on the second side, and the main beam generated by the second antenna array is biased towards the first side relative to the direction perpendicular to the array surface, then the spacing between two adjacent rows of antenna elements in the second antenna array in the target direction is greater than half the wavelength. Alternatively, if the second antenna array is positioned on the second side, and the main beam generated by the second antenna array is biased towards the second side relative to the direction perpendicular to the array surface, then the spacing between two adjacent rows of antenna elements in the target direction is less than half the wavelength.

[0024] In one possible implementation, if the second linear array is positioned on the first side, and the main beam generated by the second linear array is biased towards the first side relative to the direction perpendicular to the array surface, then the spacing d between two adjacent rows of antenna elements of the second linear array in the target direction is... a satisfy Where δ a λ is the phase difference fed by the two adjacent rows of antenna elements in the second antenna array in the target direction, where λ is the wavelength;

[0025] or,

[0026] If the second linear array is positioned on the first side, and the main beam generated by the second linear array is deflected towards the second side, then d a satisfy

[0027] In one possible implementation, if the second antenna array is positioned on the second side, and the main beam generated by the second antenna array is biased towards the first side relative to the direction perpendicular to the array surface, then the spacing d between two adjacent rows of antenna elements of the second antenna array in the target direction is... b satisfy Where δ b Let d be the phase difference fed to two adjacent rows of antenna elements in the second second linear array in the target direction. Alternatively, if the second second linear array is positioned on the second side, and the main beam generated by the second second linear array is biased towards the second side relative to the direction perpendicular to the array surface, then the spacing d between two adjacent rows of antenna elements in the second second linear array in the target direction is... b satisfy

[0028] In one possible implementation, if the second antenna array includes N rows of antenna elements in the target direction, the excitation voltage amplitude of the N rows of antenna elements first increases and then decreases in the target direction.

[0029] In one possible implementation, if the second antenna array includes M rows of antenna elements in the target direction, then the ratio of the excitation voltage amplitudes of the M rows of antenna elements in the target direction is as follows:

[0030] In one possible implementation, the sum of the excitation voltage amplitudes of the odd-numbered rows of antenna elements in the N rows of the second antenna array is equal to the sum of the excitation voltage amplitudes of the even-numbered rows of antenna elements in the N rows of the antenna array.

[0031] In one possible implementation, the first side is the top side and the second side is the bottom side. Alternatively, the first side is the left side and the second side is the right side.

[0032] In one possible implementation, the second linear array includes at least three rows of antenna elements in the target direction.

[0033] A third aspect of this application provides an antenna pole station:

[0034] It includes a mast, a mounting bracket, a baffle, and an antenna module, wherein the antenna module houses the antenna system as described in the first or second aspect. The mounting bracket is fixedly connected to the mast, and the baffle and antenna module are fixedly connected to the mounting bracket, with the baffle positioned between the mast and the antenna module.

[0035] In this application, by setting a baffle between the antenna module and the mast, the electromagnetic waves generated by the MT antenna and DU antenna in the antenna system can be scattered or adjusted, thereby ensuring that the isolation between the MT antenna and DU antenna is not affected by the mast and mounting components.

[0036] In one possible implementation, the baffle is rectangular or curved. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the structure of the IAB node in this application;

[0038] Figure 2 This is a schematic diagram of an application scenario in this application;

[0039] Figure 3 This is another schematic diagram illustrating the application scenario in this application;

[0040] Figure 4 This is a schematic diagram of an existing antenna system;

[0041] Figure 5 This is a schematic diagram of the antenna system in this application;

[0042] Figure 6 This is another schematic diagram of the antenna system in this application;

[0043] Figure 7 This is a schematic diagram illustrating the principle by which this application achieves a high degree of isolation;

[0044] Figure 8 This is a schematic diagram illustrating the difference in isolation between the antenna system of this application and existing antenna systems;

[0045] Figure 9a This is a gain diagram of the antenna system in this application;

[0046] Figure 9b This is another gain diagram of the antenna system in this application;

[0047] Figure 9c This refers to the isolation degree corresponding to the ratio of different excitation voltage amplitudes in this application;

[0048] Figure 10 This is another schematic diagram of the antenna system in this application;

[0049] Figure 11 This is another schematic diagram illustrating the principle by which this application achieves a high degree of isolation;

[0050] Figure 12 This is another schematic diagram illustrating the difference in isolation between the antenna system of this application and existing antenna systems;

[0051] Figure 13a This is a gain diagram of the antenna system in this application;

[0052] Figure 13b This is another gain diagram of the antenna system in this application;

[0053] Figure 14 This is another schematic diagram of the antenna system in this application;

[0054] Figure 15 This is another schematic diagram illustrating the principle by which this application achieves a high degree of isolation;

[0055] Figure 16 This is another schematic diagram illustrating the difference in isolation between the antenna system of this application and existing antenna systems;

[0056] Figure 17a This is a gain diagram of the antenna system in this application;

[0057] Figure 17b This is another gain diagram of the antenna system in this application;

[0058] Figure 18 This is another schematic diagram of the antenna system in this application;

[0059] Figure 19 This is another schematic diagram illustrating the principle by which this application achieves a high degree of isolation;

[0060] Figure 20 This is another schematic diagram illustrating the difference in isolation between the antenna system of this application and existing antenna systems;

[0061] Figure 21a This is a gain diagram of the antenna system in this application;

[0062] Figure 21b This is another gain diagram of the antenna system in this application;

[0063] Figure 22 This is a structural schematic diagram of the antenna pole station in this application;

[0064] Figure 23 This is another structural schematic diagram of the antenna mast station in this application. Detailed Implementation

[0065] The embodiments of this application are described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. As those skilled in the art will understand, with the development of technology and the emergence of new scenarios, the technical solutions provided by the embodiments of this application are also applicable to similar technical problems.

[0066] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments described herein can be implemented in a sequence other than that illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0067] Please see Figure 1 The IAB node's antenna consists of two parts: a MU antenna and a DU antenna. These two antennas perform different functions, thereby extending the coverage of the macro base station and filling blind spots, maximizing the capacity potential and spectrum value of MIMO. Please refer to [link / reference]. Figure 2 In a typical application scenario for an IAB node, there are backhaul links and access links. The DU antenna of the IAB node provides radio access services to the UE through the access link, while the MT antenna of the IAB node connects to the macro base station through the backhaul link and transmits service data from the UE to the macro base station. It should be noted that... Figure 2 This is just a simplified illustration of an application scenario; the application scenario for an IAB node can also include multiple IAB nodes and multiple UEs. For example, please refer to... Figure 3 This application scenario includes IAB node 1, IAB node 2, and a macro base station. The macro base station can access the core network. The MT antenna of IAB node 1 is connected to the macro base station via an upstream backhaul link, and the MT antenna of IAB node 2 is connected to IAB node 1 via a downstream backhaul link. In addition, the DU antennas of IAB node 1, IAB node 2, and the macro base station provide access services to the UE via access links.

[0068] In current technology, due to the low isolation between the MT antenna and DU antenna, IAB nodes often operate in frequency division duplex (FDM) or time division duplex (TDM) mode, making it impossible to simultaneously transmit and receive signals within the same frequency band. This means that it's not possible for the MT antenna to receive signals from the macro base station while the DU antenna is transmitting signals to the UE, or for the MT antenna to transmit signals to the macro base station while the DU antenna is receiving signals from the UE. To improve the isolation between the MT and DU antennas, please refer to [link to relevant documentation]. Figure 4In existing technologies, metal fences are used to surround the MT and DU antennas, reducing interference between them by reflecting electromagnetic waves. Furthermore, a metal bar array is placed between the MT and DU antennas to further improve isolation by suppressing surface waves. However, these metal fences and arrays occupy a significant amount of space, impacting the design of other parts of the IAB node.

[0069] This application provides an antenna system for improving the isolation between an MT antenna and a DU antenna.

[0070] The antenna array in the embodiments of this application can be used as an IAB node, applied to, for example... Figure 2 or Figure 3 In the application scenarios shown.

[0071] Please see Figure 5 The antenna system in this embodiment includes a first antenna array and a second antenna array. The first antenna array is disposed on a first side, and the second antenna array is disposed on a second side. The first antenna array and the second antenna array are respectively used as a medium-mass antenna (MT antenna) and a dual-mass antenna (DU antenna). For example, the first antenna array can be used as an MT antenna or as a DU antenna. In one case, the first side is, for example, the upper side, and the second side is, for example, the lower side; or in another case, the first side is the left side, and the second side is the right side. Of course, the first side and the second side are not limited to the above situations. In one case, the first antenna array and the second antenna array can be used to simultaneously transmit and receive signals in the same frequency band. That is, when the DU antenna transmits a signal to the UE in the same frequency band, the MT antenna can also receive signals from the macro base station, and when the DU antenna receives signals from the UE, the MT antenna can also transmit signals to the macro base station.

[0072] The spacing between two adjacent rows of antenna elements in the first antenna array along the target direction is determined by the phase difference and wavelength of the feed to those two adjacent rows of antenna elements. Similarly, the spacing between two adjacent rows of antenna elements in the second antenna array along the target direction is determined by the phase difference and wavelength of the feed to those two adjacent rows of antenna elements. The target direction is the direction from the first side to the second side. The first and second antenna arrays use the same operating frequency band. The wavelength is the wavelength corresponding to that operating frequency band, such as the wavelength corresponding to the center frequency, a high-frequency frequency, or a low-frequency frequency within that operating frequency band. In a preferred embodiment, the wavelength can be the wavelength corresponding to the center frequency within the operating frequency band.

[0073] In one specific implementation, if the main beam generated by the first antenna array is biased towards the first side relative to the direction perpendicular to the array surface, then the spacing d between two adjacent rows of antenna elements in the target direction of the first antenna array...a1 It satisfies the following formula (1):

[0074]

[0075] δ a1 The phase difference between the feeds of the two adjacent rows of antenna elements is given by λ, where λ is the wavelength.

[0076] If the main beam generated by the first antenna array is deflected to the second side relative to the direction of the vertical array, then the spacing d between two adjacent rows of antenna elements in the target direction of the first antenna array... a2 The following formula (2) is satisfied:

[0077]

[0078] δ a2 The phase difference between the feeds of the two adjacent rows of antenna elements.

[0079] If the main beam generated by the second linear array is biased towards the first side relative to the direction of the vertical array, then the spacing d between two adjacent rows of antenna elements in the target direction of the second linear array... b1 The following formula (3) is satisfied:

[0080]

[0081] δ b1 The phase difference between the feeds of the two adjacent rows of antenna elements.

[0082] Alternatively, if the main beam generated by the second linear array is offset to the second side relative to the direction of the vertical array, then the spacing d between two adjacent rows of antenna elements in the target direction of the second linear array... b2 The following formula (4) is satisfied:

[0083]

[0084] δ b2 The phase difference between the feeds of the two adjacent rows of antenna elements.

[0085] If there is an antenna array in the first antenna array and the second antenna array whose main beam does not deflect, that is, the main beam generated by the antenna array is perpendicular to the array surface, since the phase difference fed by the two adjacent rows of antenna elements in the target direction of the antenna array is zero, it can be deduced that the spacing between the two adjacent rows of antenna elements in the target direction of the antenna array is half a wavelength. Of course, in actual implementation, the above spacing can also be selected with appropriate values ​​in the range of greater than half a wavelength or less than half a wavelength.

[0086] In another specific implementation, if the main beam generated by the first antenna array is biased towards the first side relative to the direction of the vertical array, the spacing between the two adjacent rows of antenna elements in the target direction of the first antenna array may not be set completely according to formula (1), but may be selected in an appropriate range of less than half a wavelength.

[0087] If the main beam generated by the first antenna array is biased to the second side relative to the direction of the vertical array, the spacing between the two adjacent rows of antenna elements in the target direction of the first antenna array does not have to be set exactly according to formula (2), but can be selected in a range greater than half a wavelength.

[0088] If the main beam generated by the second linear array is biased towards the first side relative to the direction of the vertical array, the spacing between the two adjacent rows of antenna elements in the target direction of the second linear array does not have to be set exactly according to formula (3), but can be selected in a range greater than half a wavelength.

[0089] If the main beam generated by the second linear array is biased to the second side relative to the direction of the vertical array, the spacing between the two adjacent rows of antenna elements in the target direction of the second linear array does not have to be set exactly according to formula (4), but can be selected in an appropriate range of less than half a wavelength.

[0090] It should be noted that the excitation voltage amplitudes of each antenna element in a row of antenna elements in both the first and second antenna arrays are the same in the target direction. Based on the above, if the first antenna array includes M rows of antenna elements in the target direction, the excitation voltage amplitude of the M rows of antenna elements first increases and then decreases in the target direction; similarly, if the second antenna array includes N rows of antenna elements in the target direction, the excitation voltage amplitude of the N rows of antenna elements first increases and then decreases in the target direction, thus satisfying a tapered distribution. For example, in a preferred embodiment, if the first antenna array includes M rows of antenna elements in the target direction, the ratio of the excitation voltage amplitudes of these M rows of antenna elements in the target direction is as follows: If the second antenna array includes N rows of antenna elements in the target direction, then the ratio of the excitation voltage amplitudes of these N rows of antenna elements in the target direction is as follows:

[0091] Alternatively, in another scenario, if the first antenna array comprises M rows of antenna elements in the target direction, then the sum of the excitation voltage amplitudes of the odd-numbered rows of antenna elements in the M rows is equal to the sum of the excitation voltage amplitudes of the even-numbered rows of antenna elements in the M rows. Similarly, if the second antenna array comprises N rows of antenna elements in the target direction, then the sum of the excitation voltage amplitudes of the odd-numbered rows of antenna elements in the N rows is equal to the sum of the excitation voltage amplitudes of the even-numbered rows of antenna elements in the N rows. For example, if the first antenna array comprises 4 rows of antenna elements in the target direction, then the sum of the excitation voltage amplitudes of the first and third rows of antenna elements in the target direction is equal to the sum of the excitation voltage amplitudes of the second and fourth rows of antenna elements in the target direction.

[0092] The antenna arrays in the embodiments of this application have been generally described above. In actual implementation, at least one of the first and second antenna arrays has three or more rows of antenna elements in the target direction. In a special case, one of the first and second antenna arrays has only one row of antenna elements in the target direction, while the other antenna array is configured as described above.

[0093] The antenna system in the embodiments of this application will now be described in more detail:

[0094] Please see Figure 6 In one possible design, the first antenna array is positioned on the upper side, and the second antenna array is positioned on the lower side. Both the first and second antenna arrays include three rows of antenna elements in the target direction. Furthermore, the main beam generated by the first and second antenna arrays does not deflect. Based on the foregoing description, the spacing between two adjacent rows of antenna elements in the first antenna array in the target direction is half a wavelength, and the spacing between two adjacent rows of antenna elements in the second antenna array in the target direction is also half a wavelength. The distance between the upper edge of the first antenna array and the lower edge of the second antenna array is 5.3 wavelengths. In an optional implementation, the ratio of the excitation voltage amplitudes of the rows of antenna elements in the first antenna array from top to bottom can be set to 1:2:1, and the ratio of the excitation voltage amplitudes of the rows of antenna elements in the second antenna array from top to bottom is also 1:2:1. It should be noted that the above ratio of excitation voltage amplitudes can be achieved by adjusting the feed line width of each row of antenna elements in the power divider network; details will not be elaborated here.

[0095] Please see Figure 7 The following section discusses the principles involved. Figure 6The isolation of the antenna system shown is analyzed. In this embodiment, the antenna array improves isolation based on the principle of interference signal suppression. Taking the first antenna array as an example, each row of antenna elements in the first antenna array mainly radiates a feed signal perpendicular to the array surface. This feed signal does not affect the second antenna array located below. However, each row of antenna elements also generates an interference signal, which propagates perpendicular to the feed signal to the second antenna array below, leading to a deterioration in the isolation between the two antenna arrays. Figure 6 The first antenna array has three rows of antenna elements from top to bottom, denoted as Antenna Element Row I, Antenna Element Row II, and Antenna Element Row III. The interference signal generated by Antenna Element Row I is denoted as c1, the interference signal generated by Antenna Element Row II as c2, and the interference signal generated by Antenna Element Row III as c3. Taking a reference plane below the first antenna array, assuming the phase of interference signal c3 is 0, it is easy to see that interference signal c1, after propagating a distance of one wavelength longer than interference signal c3, has a phase difference of 360° with interference signal c3, and is exactly in phase with interference signal c3, thus superimposing on it. Interference signal c2, after propagating a distance of half a wavelength longer than interference signal c3, has a phase difference of 180° with interference signal c3, and is exactly out of phase with interference signals c1 and c3, thus canceling them out. Based on this, when the excitation voltage amplitudes of interference signals c1, c2, and c3 satisfy c1 + c3 = c2, the first antenna array can achieve good interference signal suppression, preventing the interference signals from affecting the second antenna array, thereby obtaining good isolation between the first and second antenna arrays. Based on the above description, the excitation voltage amplitude ratio of interference signal c1:interference signal c2:interference signal c3 can be selected as 1:2:1. The principle for the second antenna array to achieve good interference signal suppression is similar to that described above and will not be repeated here.

[0096] Please see Figure 8 The following schematic diagram illustrates the improvement in isolation of the antenna system of this application compared to the antenna system of the prior art. Figure 8 The vertical axis represents isolation, and the horizontal axis represents the operating frequency of the antenna array. Lines labeled "Ori" indicate the isolation between the MT and DU antennas in existing antenna systems, while lines labeled "Opt" indicate... Figure 6 The isolation between the MT antenna and the DU antenna in the antenna system shown. Figure 8 The identifier "PP" indicates that both the MT and DU antennas are +45° polarized; the identifiers "PN" and "NP" indicate that one of the MT and DU antennas is +45° polarized and the other is -45° polarized; the identifier "NN" indicates that both the MT and DU antennas are -45° polarized. Based on the above description, for example... Figure 8 The line marked "Ori-PP" indicates the isolation in prior art antenna systems where both the MT and DU antennas are +45° polarized; the line marked "Opt-PP" indicates... Figure 6 The antenna system shown demonstrates the isolation when both the MT and DU antennas are +45° polarized. It is readily apparent that, using the line marked "Ori" as the baseline, the average isolation between the MT and DU antennas in this application's antenna system is improved by 20 dB.

[0097] Please see Figure 9a , Figure 9a The vertical axis represents Figure 6 The gain corresponding to the first antenna array is shown on the x-axis as angle, where 0 degrees corresponds to the direction perpendicular to the array surface, 0 degrees to 180 degrees represent clockwise deflections relative to the perpendicular direction, and 0 degrees to -180 degrees represent counterclockwise deflections relative to the perpendicular direction. The region with approximately 90 degrees clockwise deflection relative to the perpendicular direction can be considered the interference region that will affect the second antenna array. Similarly, please refer to [link to relevant documentation]. Figure 9b , Figure 9b The vertical axis represents Figure 6 The gain corresponding to the second antenna array is defined as follows: 0 degrees corresponds to the direction perpendicular to the array surface; 0 degrees to 180 degrees represent clockwise deflections relative to the perpendicular array surface; and 0 degrees to -180 degrees represent counterclockwise deflections relative to the perpendicular array surface. The region with approximately 90 degrees counterclockwise deflection relative to the perpendicular array surface can be considered the interference region that will affect the first antenna array. In the above... Figure 9a as well as Figure 9b In the middle, the gain corresponding to the interference region is relatively low, therefore Figure 6 The antenna system shown demonstrates that the MT antenna and DU antenna achieve good isolation.

[0098] certainly, Figure 6 In the antenna system described, the ratio of the excitation voltage amplitudes of the antenna elements in each row of the first antenna array and the second antenna array from top to bottom can also be other values. Please refer to [link / reference]. Figure 9c , Figure 9c The vertical axis represents the isolation degree, and the horizontal axis represents the ratio of the excitation voltage amplitudes. It is easy to see that the optimal isolation degree can be obtained when the ratio of the excitation voltage amplitudes is 1:2:1.

[0099] In this embodiment, the antenna system does not require additional metal fences or metal bar arrays. Good isolation can be achieved simply by adjusting the spacing between adjacent rows of antenna elements and the ratio of the excitation voltage amplitude of each row of antenna elements, thereby saving a lot of space.

[0100] Please see Figure 10 In another specific design, the first antenna array is positioned on the upper side, and the second antenna array is positioned on the lower side. Both the first and second antenna arrays include three rows of antenna elements in the target direction. The distance between the upper edge of the first antenna array and the lower edge of the second antenna array is 5.3 wavelengths. The spacing between the three rows of antenna elements in the first antenna array in the target direction is d1 and d2, respectively, and the spacing between the three rows of antenna elements in the second antenna array in the target direction is d3 and d4, respectively. Furthermore, the main beam generated by the first antenna array is deflected upwards by 5 degrees relative to the vertical array surface, and the main beam generated by the second antenna array is deflected downwards by 5 degrees relative to the vertical array surface. It should be noted that the deflection of the main beams of the first and second antenna arrays can be achieved by adjusting the feed line length of each row of antenna elements in the power divider network; details will not be elaborated here. In one optional implementation, the ratio of the excitation voltage amplitudes of the antenna elements in each row of the first antenna array from top to bottom can be set to 1:2:1, and the ratio of the excitation voltage amplitudes of the antenna elements in each row of the second antenna array from top to bottom is also 1:2:1. It should be noted that... Figure 10 The first antenna array in the array is used as the MT antenna, and the second antenna array is used as the DU antenna.

[0101] Please see Figure 11 , Figure 10 The six rows of antenna elements from top to bottom in the middle Figure 11 The antenna elements are sequentially denoted as antenna row I, antenna row II, antenna row III, antenna row IV, antenna row V, and antenna row VI. The interference signal generated by antenna row I is denoted as c1, the interference signal generated by antenna row II as c2, the interference signal generated by antenna row III as c3, the interference signal generated by antenna row IV as c6, the interference signal generated by antenna row V as c5, and the interference signal generated by antenna row VI as c4.

[0102] With the feed signal of antenna element row III as the reference, the phase lags of the feed signals of antenna element rows I and II are δ1 and δ2, respectively (δ1 > δ2 > 0). With the feed signal of antenna element row IV as the reference, the phase lags of the feed signals of antenna element rows V and VI are δ3 and δ4, respectively (δ4 > δ3 > 0).

[0103] Taking a reference plane between the first antenna array and the second antenna array, the phase difference between interference signal c1 and interference signal c3 is... The following formula (5) is satisfied:

[0104]

[0105] Phase difference between interference signal c2 and interference signal c3 The following formula (6) is satisfied:

[0106]

[0107] Based on the above formulas (5) and (6), if we want the interference signal c1 to be superimposed in phase with the interference signal c3 and canceled out in the opposite direction with the interference signal c2, we can deduce that d1 satisfies the following condition. And d2 satisfies

[0108] Based on a similar derivation method, we can obtain that d3 satisfies And d4 satisfies

[0109] Based on the above introduction, the specific values ​​of d1, d2, d3, and d4 can be obtained, thereby achieving interference signal suppression.

[0110] Please see Figure 12 It is not difficult to see that Figure 10 In the antenna system shown, good isolation can also be achieved between the MT antenna and the DU antenna.

[0111] Please see Figure 13a , Figure 13a The vertical axis represents Figure 10 The gain corresponding to the first antenna array is shown in the diagram. 0 degrees corresponds to the direction perpendicular to the array surface, and -5 degrees represents the maximum directionality of the main beam generated by the first antenna array. The region deflected approximately 90 degrees clockwise relative to the direction perpendicular to the array surface can be considered the interference region that will affect the second antenna array. Similarly, please refer to [link to relevant documentation]. Figure 13b , Figure 13b The vertical axis represents Figure 10 The gain corresponding to the second antenna array is shown in the diagram. 0 degrees indicates the direction perpendicular to the array face, and +5 degrees represents the maximum directionality of the main beam generated by the second antenna array. The region approximately 90 degrees counterclockwise from the vertical array face can be considered the interference region that will affect the first antenna array. In the above... Figure 13a as well as Figure 13b In the middle, the gain corresponding to the interference region is relatively low, therefore Figure 10 In the antenna system shown, good isolation can be achieved between the MT antenna and the DU antenna.

[0112] Please see Figure 14In another specific design, the first antenna array is positioned on the upper side, and the second antenna array is positioned on the lower side. Both the first and second antenna arrays include three rows of antenna elements in the target direction. The distance between the upper edge of the first antenna array and the lower edge of the second antenna array is 5.3 wavelengths. The spacing between the three rows of antenna elements in the first antenna array in the target direction is d1 and d2, respectively, and the spacing between the three rows of antenna elements in the second antenna array in the target direction is d3 and d4, respectively. Furthermore, the main beam generated by the first antenna array is deflected downwards by 5 degrees relative to the vertical array surface, and the main beam generated by the second antenna array is deflected upwards by 5 degrees relative to the vertical array surface. In an optional implementation, the ratio of the excitation voltage amplitudes of the rows of antenna elements in the first antenna array from top to bottom can be set to 1:2:1, and the ratio of the excitation voltage amplitudes of the rows of antenna elements in the second antenna array from top to bottom is also 1:2:1. It should be noted that... Figure 14 The first antenna array in the array is used as a DU antenna, and the second antenna array is used as a MT antenna.

[0113] Please see Figure 15 , Figure 14 The six rows of antenna elements from top to bottom in the middle Figure 15 The antenna elements are sequentially denoted as antenna row I, antenna row II, antenna row III, antenna row IV, antenna row V, and antenna row VI. The interference signal generated by antenna row I is denoted as c1, the interference signal generated by antenna row II as c2, the interference signal generated by antenna row III as c3, the interference signal generated by antenna row IV as c6, the interference signal generated by antenna row V as c5, and the interference signal generated by antenna row VI as c4.

[0114] With the feed signal of antenna element row III as the reference, the phase lead of the feed signals of antenna element rows I and II is δ1 and δ2, respectively (δ1 > δ2 > 0). With the feed signal of antenna element row IV as the reference, the phase lead of the feed signals of antenna element rows V and VI is δ3 and δ4, respectively (δ4 > δ3 > 0).

[0115] Taking a reference plane between the first antenna array and the second antenna array, the phase difference between interference signal c1 and interference signal c3 is... It satisfies the following formula (7):

[0116]

[0117] Phase difference between interference signal c2 and interference signal c3 The following formula (8) is satisfied:

[0118]

[0119] Based on the above formulas (7) and (8), if we want the interference signal c1 to be superimposed in phase with the interference signal c3 and canceled out in the opposite direction with the interference signal c2, we can deduce that d1 satisfies the following condition. And d2 satisfies

[0120] Based on a similar derivation method, we can obtain that d3 satisfies And d4 satisfies

[0121] Please see Figure 16 It is not difficult to see that Figure 14 In the antenna system shown, good isolation can also be achieved between the MT antenna and the DU antenna.

[0122] Please see Figure 17a , Figure 17a The vertical axis represents Figure 14 The gain corresponding to the first antenna array is shown in the diagram. 0 degrees corresponds to the direction perpendicular to the array surface, and +5 degrees represents the maximum directionality of the main beam generated by the first antenna array. The region approximately 90 degrees clockwise relative to the direction perpendicular to the array surface can be considered the interference region that will affect the second antenna array. Similarly, please refer to [link to relevant documentation]. Figure 17b , Figure 17b The vertical axis represents Figure 14 The gain corresponding to the second antenna array is shown in the diagram. 0 degrees indicates the direction perpendicular to the array surface, and -5 degrees represents the maximum directionality of the main beam generated by the second antenna array. The region approximately 90 degrees counterclockwise from the vertical array surface can be considered the interference region that will affect the first antenna array. In the above... Figure 17a as well as Figure 17b In the middle, the gain corresponding to the interference region is relatively low, therefore Figure 14 In the antenna system shown, good isolation can be achieved between the MT antenna and the DU antenna.

[0123] Please see Figure 18In another specific design, the first antenna array is positioned on the upper side, and the second antenna array is positioned on the lower side. Both the first and second antenna arrays include three rows of antenna elements in the target direction. The distance between the upper edge of the first antenna array and the lower edge of the second antenna array is 5.3 wavelengths. The spacing between the three rows of antenna elements in the first antenna array in the target direction is d1 and d2, respectively, and the spacing between the three rows of antenna elements in the second antenna array in the target direction is d3 and d4, respectively. Furthermore, the main beam generated by the first antenna array is deflected downwards by 5 degrees relative to the direction of the vertical array, and the main beam generated by the second antenna array is also deflected downwards by 5 degrees relative to the direction of the vertical array. In an optional implementation, the ratio of the excitation voltage amplitudes of the rows of antenna elements in the first antenna array from top to bottom can be set to 1:2:1, and the ratio of the excitation voltage amplitudes of the rows of antenna elements in the second antenna array from top to bottom is also 1:2:1.

[0124] Please see Figure 19 , Figure 18 The six rows of antenna elements from top to bottom in the middle Figure 19 The antenna elements are sequentially denoted as antenna row I, antenna row II, antenna row III, antenna row IV, antenna row V, and antenna row VI. The interference signal generated by antenna row I is denoted as c1, the interference signal generated by antenna row II as c2, the interference signal generated by antenna row III as c3, the interference signal generated by antenna row IV as c6, the interference signal generated by antenna row V as c5, and the interference signal generated by antenna row VI as c4.

[0125] With the feed signal of antenna element row III as the reference, the phase lead of the feed signals of antenna element rows I and II is δ1 and δ2, respectively (δ1 > δ2 > 0). With the feed signal of antenna element row IV as the reference, the phase lag of the feed signals of antenna element rows V and VI is δ3 and δ4, respectively (δ4 > δ3 > 0).

[0126] Taking a reference plane between the first antenna array and the second antenna array, the phase difference between interference signal c1 and interference signal c3 is... Satisfies formula (7):

[0127]

[0128] Phase difference between interference signal c2 and interference signal c3 Satisfies formula (8):

[0129]

[0130] Based on the above formulas (7) and (8), if we want the interference signal c1 to be superimposed in phase with the interference signal c3 and canceled out in the opposite direction with the interference signal c2, we can deduce that d1 satisfies the following condition. And d2 satisfies

[0131] Based on a similar derivation method, we can obtain that d3 satisfies And d4 satisfies

[0132] Please see Figure 20 It is not difficult to see that Figure 18 In the antenna system shown, good isolation can also be achieved between the MT antenna and the DU antenna.

[0133] Please see Figure 21a , Figure 21a The vertical axis represents Figure 18 The gain corresponding to the first antenna array is shown in the diagram. 0 degrees corresponds to the direction perpendicular to the array surface, and +5 degrees represents the maximum directionality of the main beam generated by the first antenna array. The region approximately 90 degrees clockwise relative to the direction perpendicular to the array surface can be considered the interference region that will affect the second antenna array. Similarly, please refer to [link to relevant documentation]. Figure 21b , Figure 21b The vertical axis represents Figure 18 The gain corresponding to the second antenna array is shown in the diagram. 0 degrees indicates the direction perpendicular to the array face, and +5 degrees represents the maximum directionality of the main beam generated by the second antenna array. The region approximately 90 degrees counterclockwise from the vertical array face can be considered the interference region that will affect the first antenna array. In the above... Figure 21a as well as Figure 21b In the middle, the gain corresponding to the interference region is relatively low, therefore Figure 18 In the antenna system shown, good isolation can be achieved between the MT antenna and the DU antenna.

[0134] This application also provides an antenna pole station; please refer to [link / reference]. Figure 22The antenna mast includes a mast 2201, a mounting component 2202, a baffle 2203, and an antenna module 2204. The mast 2201 is fixedly connected to the mounting component 2202, which in turn is fixedly connected to the baffle 2203 and the antenna module 2204. The baffle 2203 is positioned between the mast 2201 and the antenna module 2204. The antenna module 2204 houses the aforementioned antenna system. In practical applications, the mast 2201 and mounting component 2202 reflect electromagnetic waves, for example, reflecting electromagnetic waves generated by the MT antenna to the DU antenna, thus reducing isolation. By using the baffle 2203, the electromagnetic waves generated by the MT and DU antennas are scattered or adjusted, and the constructed reflection path matches the reflection range with the null point range, thereby solving the aforementioned problem and improving isolation. (See also...) Figure 23 To facilitate understanding of the relative positional relationships between the aforementioned support pole 2201, baffle 2203, and antenna system, Figure 23 The three-dimensional relationship between the mast 2301, the baffle 2302, and the antenna system 2303 is shown.

[0135] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0136] In the several embodiments provided in this application, it should be understood that the disclosed systems and devices can be implemented in other ways. For example, the device embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0137] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

Claims

1. An antenna system, characterized in that, It includes a first antenna array and a second antenna array, with the first antenna array disposed on a first side and the second antenna array disposed on a second side; The spacing between two adjacent rows of antenna elements in the first antenna array in the target direction is determined based on the phase difference and wavelength of the feed of the two adjacent rows of antenna elements in the first antenna array in the target direction. The spacing between two adjacent rows of antenna elements in the second antenna array in the target direction is determined based on the phase difference and wavelength of the feed of the two adjacent rows of antenna elements in the second antenna array in the target direction. The target direction points from the first side to the second side, and the wavelength is the wavelength corresponding to the operating frequency band of the first antenna array and the second antenna array.

2. The antenna system according to claim 1, characterized in that, If the main beam generated by the first antenna array does not deflect relative to the direction of the vertical array surface, then the spacing between the two adjacent rows of antenna elements in the target direction of the first antenna array is half a wavelength.

3. The antenna system according to claim 1, characterized in that, If the main beam generated by the first antenna array is biased towards the first side relative to the direction of the vertical array, then the spacing between the two adjacent rows of antenna elements in the first antenna array in the target direction is less than half the wavelength. or, If the main beam generated by the first antenna array is biased towards the second side relative to the direction of the vertical array surface, then the spacing between the two adjacent rows of antenna elements in the target direction of the first antenna array is greater than half a wavelength.

4. The antenna system according to claim 3, characterized in that, If the main beam generated by the first antenna array is biased towards the first side relative to the direction perpendicular to the array surface, then the spacing d between the two adjacent rows of antenna elements of the first antenna array in the target direction... a satisfy Where δ a λ is the phase difference fed by the two adjacent rows of antenna elements of the first antenna array in the target direction, and λ is the wavelength; or, If the main beam generated by the first antenna array is deflected towards the second side, then the d a satisfy 5. The antenna system according to any one of claims 1 to 4, characterized in that, If the main beam generated by the second antenna array does not deflect relative to the direction of the vertical array surface, then the spacing between the two adjacent rows of antenna elements in the target direction of the second antenna array is half the wavelength.

6. The antenna system according to any one of claims 1 to 4, characterized in that, If the main beam generated by the second antenna array is biased towards the first side relative to the direction of the vertical array, then the spacing between the two adjacent rows of antenna elements in the target direction of the second antenna array is greater than half of the wavelength. or, If the main beam generated by the second antenna array is biased towards the second side relative to the direction of the vertical array surface, then the spacing between the two adjacent rows of antenna elements in the target direction of the second antenna array is less than half the wavelength.

7. The antenna system according to claim 6, characterized in that, If the main beam generated by the second antenna array is biased towards the first side relative to the direction perpendicular to the array surface, then the spacing d between the two adjacent rows of antenna elements in the target direction of the second antenna array... b satisfy Where δ b The phase difference fed by the two adjacent rows of antenna elements of the second antenna array in the target direction; or, If the main beam generated by the second antenna array is biased towards the second side relative to the direction perpendicular to the array surface, then the spacing d between the two adjacent rows of antenna elements in the target direction of the second antenna array... b satisfy 8. The antenna system according to any one of claims 1 to 4, characterized in that, If the first antenna array includes M rows of antenna elements in the target direction, the excitation voltage amplitude of the M rows of antenna elements first increases and then decreases in the target direction. If the second antenna array includes N rows of antenna elements in the target direction, the excitation voltage amplitude of the N rows of antenna elements first increases and then decreases in the target direction.

9. The antenna system according to claim 8, characterized in that, The ratio of the excitation voltage amplitudes of the M rows of antenna elements in the first antenna array is, in order, along the target direction: The ratio of the excitation voltage amplitudes of the N rows of antenna elements in the second antenna array is, in order, along the target direction:

10. The antenna system according to any one of claims 1 to 4, characterized in that, If the first antenna array includes M rows of antenna elements in the target direction, then the sum of the excitation voltage amplitudes of the odd-numbered rows of antenna elements in the M rows is equal to the sum of the excitation voltage amplitudes of the even-numbered rows of antenna elements in the M rows. If the second antenna array includes N rows of antenna elements in the target direction, then the sum of the excitation voltage amplitudes of the odd-numbered rows of antenna elements in the N rows is equal to the sum of the excitation voltage amplitudes of the even-numbered rows of antenna elements in the N rows.

11. The antenna system according to any one of claims 1 to 4, characterized in that, The first side is the upper side, and the second side is the lower side; Alternatively, the first side is the left side, and the second side is the right side.

12. The antenna system according to any one of claims 1 to 4, characterized in that, At least one of the first antenna array and the second antenna array is a target antenna array, and the target antenna array includes at least three rows of antenna elements in the target direction.

13. An antenna system, characterized in that, It includes a first antenna array and a second antenna array, with the first antenna array and the second antenna array respectively disposed on a first side and a second side; The first antenna array includes a row of antenna elements in the target direction. The spacing between two adjacent rows of antenna elements in the second antenna array in the target direction is determined based on the phase difference and wavelength of the feed of the two adjacent rows of antenna elements in the target direction. The target direction points from the first side to the second side. The wavelength is the wavelength corresponding to the operating frequency band of the first antenna array and the second antenna array.

14. The antenna system according to claim 13, characterized in that, If the main beam generated by the second antenna array does not deflect relative to the direction of the vertical array surface, then the spacing between the two adjacent rows of antenna elements in the target direction of the second antenna array is half the wavelength.

15. The antenna system according to claim 13, characterized in that, If the second antenna array is disposed on the first side, and the main beam generated by the second antenna array is biased towards the first side relative to the direction of the vertical array, then the spacing between the two adjacent rows of antenna elements of the second antenna array in the target direction is less than half the wavelength. or, If the second antenna array is disposed on the first side, and the main beam generated by the second antenna array is biased towards the second side relative to the direction of the vertical array, then the spacing between the two adjacent rows of antenna elements of the second antenna array in the target direction is greater than half a wavelength.

16. The antenna system according to claim 13, characterized in that, If the second antenna array is disposed on the second side, and the main beam generated by the second antenna array is biased towards the first side relative to the direction of the vertical array, then the spacing between the two adjacent rows of antenna elements of the second antenna array in the target direction is greater than half of the wavelength. or, If the second antenna array is disposed on the second side, and the main beam generated by the second antenna array is biased towards the second side relative to the direction of the vertical array, then the spacing between the two adjacent rows of antenna elements of the second antenna array in the target direction is less than half the wavelength.

17. The antenna system according to claim 15, characterized in that, If the second antenna array is positioned on the first side, and the main beam generated by the second antenna array is biased towards the first side relative to the direction perpendicular to the array surface, then the spacing d between the two adjacent rows of antenna elements of the second antenna array in the target direction... a satisfy Where δ a λ is the phase difference fed by the two adjacent rows of antenna elements of the second antenna array in the target direction, and λ is the wavelength; or, If the second antenna array is positioned on the first side, and the main beam generated by the second antenna array is biased towards the second side, then the d a satisfy 18. The antenna system according to claim 16, characterized in that, If the second antenna array is positioned on the second side, and the main beam generated by the second antenna array is biased towards the first side relative to the direction perpendicular to the array surface, then the spacing d between the two adjacent rows of antenna elements of the second antenna array in the target direction... b satisfy Where δ b The phase difference fed by the two adjacent rows of antenna elements of the second antenna array in the target direction; or, If the second antenna array is positioned on the second side, and the main beam generated by the second antenna array is biased towards the second side relative to the direction perpendicular to the array surface, then the spacing d between the two adjacent rows of antenna elements of the second antenna array in the target direction... b satisfy 19. The antenna system according to any one of claims 13 to 18, characterized in that, If the second antenna array includes M rows of antenna elements in the target direction, the excitation voltage amplitude of the M rows of antenna elements first increases and then decreases in the target direction.

20. The antenna system according to claim 19, characterized in that, The ratio of the excitation voltage amplitudes of the M rows of antenna elements in the second antenna array in the target direction is as follows:

21. The antenna system according to any one of claims 13 to 18, characterized in that, If the second antenna array includes M rows of antenna elements in the target direction, then the sum of the excitation voltage amplitudes of the odd-numbered rows of antenna elements in the M rows is equal to the sum of the excitation voltage amplitudes of the even-numbered rows of antenna elements in the M rows.

22. The antenna system according to any one of claims 13 to 18, characterized in that, The first side is the upper side, and the second side is the lower side; Alternatively, the first side is the left side, and the second side is the right side.

23. The antenna system according to any one of claims 13 to 18, characterized in that, The second antenna array includes at least three rows of antenna elements in the target direction.

24. An antenna mast station, characterized in that, It includes a mast, mounting components, a baffle, and an antenna module, wherein the antenna module is provided with an antenna system as described in any one of claims 1 to 23; The mounting component is fixedly connected to the pole. The baffle and the antenna module are fixedly connected to the mounting component, and the baffle is disposed between the mast and the antenna module.

25. The antenna mast station according to claim 24, characterized in that, The baffle is rectangular or curved.

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