Antenna array structure, antenna and base station

Abstract

The present invention provides an antenna array structure, an antenna and a base station. The antenna array structure includes a low-frequency array, a medium-frequency array and a high-frequency array arranged on the same reflector. Each array includes a plurality of linearly arranged radiation units corresponding to its frequency band. In the transverse direction of the reflector, a plurality of high-frequency arrays are centrally arranged side by side, two low-frequency arrays are collinearly arranged with two high-frequency arrays on the sides thereof, and two medium-frequency arrays are arranged outside the high-frequency arrays on the sides. In the transverse direction of the reflector, the reflector is provided with a central highest support surface and non-highest support surfaces symmetrically distributed on both sides of the highest support surface, and the high-frequency array between the two columns of the collinear arrangement is arranged on the highest support surface. The present invention adopts spatial multiplexing technology to arrange a plurality of arrays of different frequency bands on the highest support surface and the non-highest support surface, so that the arrays will not interfere with each other and the radiation performance is better.

Description

Technical Field

[0001] The present invention belongs to the technical field of mobile communications, and in particular relates to an antenna array structure, an antenna configured with the antenna array structure, and a base station configured with the antenna. Background Art

[0002] TDD antennas are usually called smart antennas, which are composed of several sub-arrays and can accurately track multiple mobile devices by adaptively adding weights. Smart antennas have symmetry in uplink and downlink, which can effectively reduce multipath interference and improve the reliability of communication systems and spectrum utilization efficiency. Based on the above advantages, smart antennas are widely used and promoted in the industry. At the same time, smart antennas need to receive accurate amplitudes and phases of each sub-array for accurate positioning and broadcast beamforming of mobile devices. Generally speaking, in the design, each sub-array must be an equi-horizontal plane in order to obtain a good equi-phase plane. With the continuous development of communication technology and the differences in application scenarios, 4G / 5G networks will coexist for a long time, and 4G networks will still be the main bearer network for some time in the future, which has given rise to the birth of 4G / 5G multi-frequency fusion antennas.

[0003] The radio and television 700M (703-798MHz) is the golden frequency band for mobile communication services and is also the FDD frequency band in 5G NR. 5G NR supports 256QAM high-order modulation, which places higher requirements on the downlink carrier-to-interference ratio and requires reducing the mutual interference between the three-sector vertex excitation site layouts, which inevitably places higher requirements on antenna performance. Due to its low frequency band and long wavelength, 700MHz requires the antenna radiation unit aperture to become larger, and the boundary conditions required for the low-frequency radiation unit become more stringent. In the application of 700MHz, the traditional 4G / 5G fusion antenna FDD array coaxial nested boundary solution has encountered great challenges. However, larger radiating units will not only reduce the spatial reuse rate between arrays in the traditional layout scheme, but also require a wider bottom plate boundary adjustment. The low-frequency radiating unit cannot be too close to the edge of the bottom plate, otherwise it will inevitably cause the projections of the low-frequency and other frequency bands to interfere with each other, the maximum radiation directions will block each other, and the mutual coupling and reflection between the frequency bands will increase dramatically, causing the indicators of each frequency band to deteriorate rapidly, seriously affecting the system performance and failing to meet the usage requirements. Summary of the invention

[0004] The first object of the present invention is to provide an antenna array structure suitable for fusion and nesting of radiation element arrays.

[0005] Another object of the present invention is to provide an antenna.

[0006] Another object of the present invention is to provide a base station.

[0007] An antenna array structure is provided for the first purpose of the present invention, including a low-frequency array, a medium-frequency array and a high-frequency array arranged on the same reflector, each array including a plurality of linearly arranged radiation units corresponding to its frequency band,

[0008] In the transverse direction of the reflector, the plurality of high-frequency arrays are arranged side by side in the center, the two low-frequency arrays are arranged in line with the two high-frequency arrays on the sides thereof, and the two medium-frequency arrays are arranged outside the high-frequency arrays on the sides;

[0009] In the transverse direction of the reflector, the reflector is provided with a central highest support surface and non-highest support surfaces symmetrically distributed on both sides of the highest support surface, and the high-frequency array between the two columns arranged in the same line is arranged on the highest support surface.

[0010] Furthermore, the non-highest supporting surface only provides a supporting surface at one height, which is an inherent reference supporting surface of the reflector.

[0011] Furthermore, the non-highest supporting surface includes a reference supporting surface inherent to the reflector and a lowest supporting surface whose height is lower than the reference supporting surface, the collinearly arranged high-frequency array and low-frequency array are arranged on the reference supporting surface, and the intermediate frequency array is arranged on the lowest supporting surface.

[0012] Preferably, the plurality of high-frequency arrays are used to radiate the same antenna beam, and each of the low-frequency array and the medium-frequency array is used to radiate a separate antenna beam.

[0013] Furthermore, an isolation plate is provided in the middle of the highest supporting surface of the reflection plate and parallel to the high-frequency array.

[0014] Preferably, the height of the isolation plate is 0.3-0.4 times the wavelength of the working frequency of the high-frequency array.

[0015] Specifically, a separation wall is formed between two adjacent support surfaces at different heights.

[0016] Preferably, the height difference between two adjacent support surfaces at different heights is 0.1-0.2 times the wavelength of the working frequency of the high-frequency array.

[0017] Furthermore, the highest supporting surface includes at least two high-frequency arrays.

[0018] Specifically, the projections of the radiation units of the low-frequency array and the radiation units of the high-frequency array on the reflection plate do not interfere with each other.

[0019] Furthermore, the high frequency array is used to pass TDD high frequency signals, the intermediate frequency array is used to pass FDD intermediate frequency signals, and the low frequency array is used to pass FDD low frequency signals.

[0020] An antenna is provided for the second purpose of the present invention, wherein the antenna has the antenna array structure described in the first purpose.

[0021] A base station is provided for another purpose of the present invention, wherein the base station has the antenna described in the second purpose.

[0022] Compared with the prior art, the advantages of the present invention are as follows:

[0023] First, the antenna array structure of the present invention arranges the low-frequency array, the medium-frequency array and the high-frequency array on the highest supporting surface and the non-highest supporting surface of the reflector in a spatial multiplexing manner, so that the arrays between different frequency bands will not affect the signal transmission of each other.

[0024] Secondly, the highest supporting surface of the antenna array structure of the present invention is used to set the high-frequency array, so as to prevent the high-frequency radiating units of the high-frequency array from interfering with the signal radiation of the low-frequency radiating units of the low-frequency array and the intermediate-frequency radiating units of the intermediate-frequency array.

[0025] Additional aspects and advantages of the present invention will be given in part in the following description, which will become obvious from the following description, or may be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0027] Figure 1 The figure is a schematic diagram of the structure of an antenna array according to an embodiment of the present invention.

[0028] Figure 2 The figure is a schematic diagram of an antenna array structure according to an embodiment of the present invention.

[0029] Figure 3 FIG. 4 is a top view of an antenna array structure according to an embodiment of the present invention.

[0030] Figure 4 The figure is a schematic diagram of the structure of an antenna array according to an embodiment of the present invention.

[0031] Figure 5 The figure is a schematic diagram of an antenna array structure according to an embodiment of the present invention. DETAILED DESCRIPTION

[0032] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention and cannot be interpreted as limiting the present invention.

[0033] It will be understood by those skilled in the art that, unless expressly stated, the singular forms "one", "said", and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present invention refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. It should be understood that when we refer to an element as being "connected" or "coupled" to another element, it may be directly connected or coupled to the other element, or there may be an intermediate element. In addition, the "connection" or "coupling" used herein may include wireless connection or wireless coupling. The term "and / or" used herein includes all or any unit and all combinations of one or more associated listed items.

[0034] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as generally understood by those skilled in the art in the art to which the present invention belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless specifically defined as herein.

[0035] The present invention provides an antenna array structure, which is used to reasonably arrange radiation unit arrays of different high, medium and low frequency bands, and the radiation unit arrays can be fused and nested with each other without causing signal interference.

[0036] In an exemplary embodiment of the present invention, Figure 1 The antenna array structure 10 includes a reflector 15, a low frequency array, a medium frequency array and a high frequency array.

[0037] The low-frequency array includes a plurality of low-frequency radiation units 121, which are coaxially arranged in a row; the intermediate frequency array includes a plurality of intermediate frequency radiation units 131, which are coaxially arranged in a row; the high-frequency array includes a plurality of high-frequency radiation units 141, which are coaxially arranged in a row.

[0038] The reflector 15 includes a highest support surface 151 and at least two non-highest support surfaces, and the at least two non-highest support surfaces are symmetrically distributed on both sides of the highest support surface 151. The highest support surface 151 and the non-highest support surfaces are both used to set the low frequency array and / or the intermediate frequency array and / or the high frequency array.

[0039] In the present invention, at least two rows of high-frequency arrays are disposed on the highest supporting surface 151 . These high-frequency arrays are parallel to each other and arranged side by side. The high-frequency arrays are arranged along the length direction of the highest supporting surface 151 .

[0040] In an exemplary embodiment of the present invention, Figure 2 Two rows of high-frequency arrays are arranged on the highest support surface 151. The two rows of high-frequency arrays are evenly distributed on both sides of the first central axis with the central axis in the longitudinal direction of the highest support surface 151 (the central axis is called the first central axis). The two rows of high-frequency arrays are called the first high-frequency array and the second high-frequency array. The first high-frequency array and the second high-frequency array are parallel to each other and symmetrical along the first central axis.

[0041] There is also an isolation plate (the isolation plate is referred to as the first isolation plate 153) for separating the first high frequency array and the second high frequency array on the highest support surface 151. The first isolation plate 153 is used to isolate the signal interference between the first high frequency array and the second high frequency array. The first isolation plate 153 is arranged on the first central axis, and the first isolation plate 153 is parallel to the first high frequency array and the second high frequency array.

[0042] In some embodiments of the present invention that have achieved better performance through actual measurements, the height of the first isolation plate 153 in the vertical direction (the thickness direction of the highest supporting surface 151) is 0.3-0.4 times the wavelength of the working frequency of the high-frequency radiation unit 141, which can effectively isolate the mutual interference between the first high-frequency array and the second high-frequency array.

[0043] In a typical embodiment of the present invention, in order to facilitate the description of the present invention, a fictitious reference horizontal plane is set, and the highest support surface 151 and the non-highest support surface are both located directly above the reference horizontal plane in the vertical direction; the height of the highest support surface 151 relative to the reference horizontal plane is greater than the height of the non-highest support surface relative to the reference horizontal plane.

[0044] The non-highest support surface includes a reference support surface 152 inherent to the reflector 15. The height of the reference support surface 152 relative to the reference horizontal plane is less than the height of the highest support surface 151 relative to the reference horizontal plane, that is, the highest support surface 151 is located above the reference support surface 152. The reference support surface 152 is arranged on one side of the length direction of the highest support surface 151, and the reference support surface 152 is parallel to the highest support surface 151.

[0045] Since the reference support surface 152 and the highest support surface 151 are located at different heights relative to the reference horizontal plane, in order to connect the reflector 15 into a whole, the reference support surface 152 and the side edges of the highest support surface 151 that are close to each other are connected by a partition wall (the partition wall is called the first partition wall 155), so that the reflector 15 is formed into a whole. Since the projections of the sides of the reference support surface 152 and the highest support surface 151 that are close to each other in the vertical direction coincide with each other, the first partition wall 155 is respectively perpendicular to the reference support surface 152 and the highest support surface 151. In actual production, the partition wall of the present invention can be directly bent and formed by the reflector 15.

[0046] In some embodiments of the present invention that have achieved better performance through actual measurements, the height of the first isolation wall 155 is 0.1-0.2 times the wavelength of the working frequency of the high-frequency radiation unit 141, which can more effectively isolate the high-frequency radiation unit 141 disposed on the highest support surface 151 from interfering with the radiation unit on the reference support surface 152.

[0047] At least one column of high-frequency arrays, at least one column of low-frequency arrays and at least one column of medium-frequency arrays are arranged on the reference support surface 152. The at least three columns of arrays are arranged parallel to each other, and one column of low-frequency arrays and one column of high-frequency arrays are coaxially arranged on the same axis. On the same axis, the low-frequency radiation units 121 of the low-frequency array and the high-frequency radiation units 141 of the high-frequency array can be arranged at intervals.

[0048] In an exemplary embodiment of the present invention, Figure 2 and Figure 3 , a high frequency array, a medium frequency array, and a low frequency array are arranged on the reference support surface 152. The three arrays are arranged along the length direction of the reference support surface 152 and are parallel to each other. The low frequency array and the high frequency array are arranged on the same axis, and the low frequency radiation units 121 of the low frequency array and the high frequency radiation units 141 of the high frequency array are arranged at intervals, and one low frequency radiation unit 121 can be arranged at intervals of one or two high frequency radiation units 141.

[0049] Combination Figure 2 Therefore, the vertical height of the low-frequency radiation unit 121 is greater than the vertical height of the high-frequency radiation unit 141 and the vertical height of the intermediate-frequency radiation unit 131. When the low-frequency array, the high-frequency array, and the intermediate-frequency array are all arranged on the horizontal reference support surface 152, the height of the low-frequency radiation unit 121 relative to the reference support surface 152 is greater than the height of the high-frequency radiation unit 141 relative to the reference support surface 152 and the height of the intermediate-frequency radiation unit 131 relative to the reference support surface 152.

[0050] Moreover, the vertical height of the low-frequency radiation unit 121 is greater than the sum of the vertical height of the first isolation wall 155 and the vertical height of the high-frequency radiation unit 141, so that the highest point of the low-frequency radiation unit 121 set on the reference support surface 152 will be higher than the highest point of the high-frequency radiation unit 141 set on the highest support surface 151.

[0051] Since the four radiation arms of the low-frequency radiation unit 121 have a relatively large length, the length of the radiation arm of the low-frequency radiation unit 121 is greater than the distance between the adjacent low-frequency radiation units 121 and the high-frequency radiation unit 141 arranged on the coaxial line, so that the radiation arm of the higher low-frequency radiation unit 121 can cover the high-frequency radiation unit 141, that is, the projection of the radiation arm of the low-frequency radiation unit 121 (hereinafter referred to as the projection refers to the projection in the vertical direction) will intersect with the projection of the high-frequency radiation unit 141, and the low-frequency radiation unit 121 thus affects the signal radiation of the high-frequency radiation unit 141. At the same time, the length of the radiation arm of the low-frequency radiation unit 121 is also greater than the distance between the low-frequency radiation unit 121 and the adjacent high-frequency radiation unit 141 on the highest supporting surface 151, so that the radiation arm of the low-frequency radiation unit 121 can cover the high-frequency radiation unit 141.

[0052] In order to avoid the problem of the low-frequency radiation unit 121 covering the high-frequency radiation unit 141, the projection of the radiation arm of the low-frequency radiation unit 121 arranged on the reference support surface 152 does not intersect or overlap with the projection of the high-frequency radiation unit 141 coaxially arranged on the reference support surface 152 and the projection of the high-frequency radiation unit 141 arranged on the highest support surface 151 close to the reference support surface 152, so that the low-frequency radiation unit 121 will not affect the external radiation signal of the high-frequency radiation unit 141. Figure 3 The low-frequency radiation unit 121 and the high-frequency radiation unit 141 are arranged relative to each other as follows: the high-frequency radiation unit 141 coaxially arranged with the low-frequency radiation unit 121 and the high-frequency radiation unit 141 arranged on the highest supporting surface 151 are arranged in the space area between two adjacent radiation arms of the low-frequency radiation unit 121, and the projection of two adjacent radiation arms of the low-frequency radiation arm does not intersect with the projection of the high-frequency radiation arm arranged between the two radiation arms, thereby avoiding the low-frequency radiation unit 121 affecting the external radiation signal of the high-frequency radiation unit 141.

[0053] The intermediate frequency array is arranged away from the first isolation wall 155 relative to the high frequency array and the low frequency array. In order to prevent the low frequency radiation unit 121 from affecting the external radiation signal of the intermediate frequency radiation unit 131, the intermediate frequency array is arranged outside the coverage of the projection of the low frequency radiation unit 121 of the low frequency array. The intermediate frequency array is arranged parallel to and in parallel with the high frequency array and the low frequency array on the same reference support surface 152.

[0054] An isolation plate (referred to as a second isolation plate 154) is also provided between the intermediate frequency array and the high frequency array on the same reference support surface 152. The second isolation plate 154 extends along the length direction of the reference support surface 152 and is used to isolate the intermediate frequency array and the high frequency array to avoid mutual interference between the radiation units. The second isolation plate 154 is consistent in structure and height with the first isolation plate 153 provided on the highest support surface 151 as described above, and will not be described again here to save space.

[0055] The reflector 15 includes two reference support surfaces 152, which are respectively arranged on both sides of the length direction of the highest support surface 151, and the two reference support surfaces 152 can be symmetrical to each other along the first central axis. The reference support surface 152 arranged on the left side of the highest support surface 151 is called the first reference support surface 157, and the reference support surface 152 arranged on the right side of the highest support surface 151 is called the second reference support surface 158. Preferably, the first reference support surface 157 and the second reference support surface 158 are symmetrical with respect to the first central axis.

[0056] In one embodiment, in combination Figure 4 and Figure 5 In addition to the two reference support surfaces 152, the non-highest support surface also includes two lowest support surfaces 159. The two lowest support surfaces 159 are respectively arranged on the side of the two reference support surfaces 152 that is farther away from the highest support surface 151.

[0057] The height of the lowest support surface 159 relative to the reference horizontal plane is lower than the height of the reference support surface 152 relative to the reference horizontal plane. The lowest support surface 159 is parallel to the reference support surface 152 and the highest support surface 151, and the projection of the lowest support surface 159 does not intersect with the projection of the reference support surface 152 and the projection of the highest support surface 151.

[0058] Since the lowest support surface 159 and the reference support surface 152 are at different heights relative to the reference horizontal plane, in order to make the reflector 15 as a whole, the side surfaces of the lowest support surface 159 and the reference support surface 152 close to each other are connected by a partition wall (the partition wall is called the second partition wall 156), so that the reflector 15 is a whole. Therefore, the projections of the sides of the lowest support surface 159 and the reference support surface 152 close to each other overlap, so that the second partition wall is perpendicular to the reference support surface 152 and the highest support surface 151 respectively.

[0059] In some embodiments of the present invention that have achieved better performance through actual measurements, the height of the second isolation wall 156 is 0.15-0.25 times the operating frequency wavelength of the high-frequency radiation unit 141, which will more effectively isolate the radiation unit disposed on the reference support surface 152 from causing signal interference to the radiation unit disposed on the lowest support surface 159.

[0060] In this embodiment, the intermediate frequency array disposed on the reference support surface 152 in the previous embodiment can be disposed on the lowest support surface 159, the intermediate frequency array is arranged along the length direction of the lowest support surface 159, and the projection of the low frequency radiation unit 121 of the low frequency array disposed on the reference support surface 152 does not intersect or overlap with the projection of the intermediate frequency radiation unit 131 on the intermediate frequency array. The second isolation plate 154 is no longer disposed on the reference support surface 152.

[0061] The reflector 15 has two lowest support surfaces 159, which are respectively a first lowest support surface 160 and a second lowest support surface 161. The first lowest support surface 160 is disposed on a side of the first reference support surface 157 away from the highest support surface 151; the second lowest support surface 161 is disposed on a side of the second support surface away from the highest support surface 151. Preferably, the first lowest support surface 160 and the second lowest support surface 161 may be symmetrical relative to the first central axis.

[0062] In one embodiment, the high frequency radiation unit 141 of the high frequency array is used to pass TDD high frequency signals; the intermediate frequency radiation unit 131 of the intermediate frequency array is used to pass FDD intermediate frequency signals; and the low frequency radiation unit 121 of the low frequency array is used to pass FDD low frequency signals.

[0063] In a preferred embodiment of the present invention, the multiple high-frequency arrays are used to radiate the same antenna beam to free space through antenna adaptive technology, and the low-frequency array and the intermediate-frequency array play a role with their own power division and phase shifting structures, and each independently forms an independent beam, thereby making the array structure of the present invention constitute an intelligent antenna array structure. Since the application of antenna adaptive technology allows the beams formed by multiple high-frequency arrays to be adjusted through intelligent algorithms, the signal interference between the high-frequency array and the low-frequency array and the intermediate-frequency array is further greatly reduced.

[0064] The present invention also provides an antenna having an antenna array structure 10 implemented in each embodiment of the present application, and feeding a TDD high-frequency signal, an FDD intermediate-frequency signal, and an FDD low-frequency signal into a high-frequency radiation unit 141 of a high-frequency array, an intermediate-frequency radiation unit 131 of an intermediate-frequency array, and a low-frequency radiation unit 121 of a low-frequency array, respectively, so as to radiate the TDD high-frequency signal through the high-frequency radiation unit 141, radiate the FDD intermediate-frequency signal through the intermediate-frequency radiation unit 131, and radiate the FDD low-frequency signal through the low-frequency radiation unit 121.

[0065] In a preferred embodiment, the antenna utilizes antenna adaptive technology, and under the control of an intelligent algorithm, utilizes multiple high-frequency arrays to jointly shape the same antenna beam, while for each of the low-frequency arrays and intermediate-frequency arrays, no intelligent algorithm intervention is added, so that each low-frequency array and each intermediate-frequency array are suitable for radiating a separate antenna beam.

[0066] After combining the high-frequency array with the intelligent antenna technology to jointly shape the same beam, the beneficial effects of the array structure of the present invention will be more clearly highlighted, and the low-frequency radiation signal, high-frequency signal and intermediate-frequency signal will work in parallel with each other, and mutual interference will be significantly reduced.

[0067] The present invention also provides a base station, which has the antenna implemented in each embodiment of the present application.

[0068] In summary, the antenna array structure of the present invention is provided with a highest supporting surface and a non-highest supporting surface at different heights, and a low-frequency array, a medium-frequency array and a high-frequency array are arranged on the highest supporting surface and the non-highest supporting surface using spatial multiplexing technology, so that there is no signal interference between the arrays, and the radiation performance is better.

[0069] The above description is only a preferred embodiment of the present invention and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present invention is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above inventive concept. For example, the above features are replaced with the technical features with similar functions invented in the present invention (but not limited to) to form a technical solution.

[0070] Although the subject matter has been described in language specific to structural features and / or methodological logical actions, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or actions described above. On the contrary, the specific features and actions described above are merely example forms of implementing the claims.

Claims

1. An antenna array structure, comprising a low frequency array, a medium frequency array and a high frequency array arranged on the same reflector, each array comprising a plurality of linearly arranged radiation units corresponding to its frequency band, characterized in that: In the transverse direction of the reflector, the plurality of high-frequency arrays are arranged side by side in the center, the two low-frequency arrays are arranged in line with the two high-frequency arrays on the sides thereof, and the two medium-frequency arrays are arranged outside the high-frequency arrays on the sides; In the transverse direction of the reflector, the reflector is provided with a central highest support surface and non-highest support surfaces symmetrically distributed on both sides of the highest support surface, and the high-frequency array between the two columns arranged in the same line is arranged on the highest support surface; The non-highest supporting surface includes a reference supporting surface and a lowest supporting surface whose height is lower than the reference supporting surface, the low-frequency array is arranged on the reference supporting surface, the intermediate-frequency array is arranged on the lowest supporting surface, and the lowest supporting surface is arranged on a side of the reference supporting surface away from the highest supporting surface.

2. The antenna array structure according to claim 1, characterized in that: The plurality of high-frequency arrays are used to radiate the same antenna beam, and each of the low-frequency array and the medium-frequency array is used to radiate a separate antenna beam.

3. The antenna array structure according to claim 1, characterized in that: An isolation plate is provided at the center of the highest supporting surface of the reflection plate and parallel to the high-frequency array.

4. The antenna array structure according to claim 3, characterized in that: The height of the isolation plate is 0.3-0.4 times the wavelength of the working frequency of the high-frequency array.

5. The antenna array structure according to claim 3, characterized in that: A separation wall is formed between two adjacent support surfaces of different heights.

6. The antenna array structure according to claim 5, characterized in that: The height difference between two adjacent support surfaces at different heights is 0.1-0.2 times the wavelength of the working frequency of the high-frequency array.

7. The antenna array structure according to claim 1, characterized in that: The highest supporting surface includes at least two high-frequency arrays.

8. The antenna array structure according to claim 1, characterized in that: The projections of the radiation units of the low-frequency array and the radiation units of the high-frequency array on the reflection plate do not interfere with each other.

9. The antenna array structure according to claim 1, characterized in that: The high frequency array is used for passing TDD high frequency signals, the intermediate frequency array is used for passing FDD intermediate frequency signals, and the low frequency array is used for passing FDD low frequency signals.

10. An antenna, characterized in that: The antenna has the antenna array structure as claimed in any one of claims 1 to 9.

11. A base station, characterized in that: The base station has the antenna as claimed in claim 10 .

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