A structure for reducing the layout area of a mobile communication base station antenna

Abstract

The present invention relates to the technical field of base station antenna layout, and in particular to a structure for reducing the layout area of mobile communication base station antennas. The structure for reducing the layout area of mobile communication base station antennas includes: two radiation units and a high-frequency radiation unit; the two radiation units are orthogonally symmetrically distributed at 90°, and the radiation units are located above the high-frequency radiation unit. By making the FSS periodic module into an antenna radiation unit and utilizing the spatial filtering characteristics of the FSS, the present invention reduces the mutual interference between the high- and low-frequency radiation units, thereby further reducing the overall volume of the base station antenna while ensuring the technical indicators of each radiation unit and the overall base station antenna.

Description

Technical Field

[0001] The present invention relates to the technical field of base station antenna layouts, and in particular to a structure for reducing the layout area of mobile communication base station antennas. Background Art

[0002] With the continuous increase in the number of beamforming of 5G Massive MIMO antenna arrays, and the large-scale popularization of multi-beam antennas truly fed by Rotman and Luneburg lenses in the future for sub6, 6G, 7G, etc., the miniaturization of base station antennas will surely become a rigid demand for the development of such antennas. For current traditional base station antennas, the main layout method is to use a dipole layout with high and low frequencies combined, that is, the high-frequency antenna is below and the low-frequency antenna is above, with layout methods such as side-by-side misalignment or nested misalignment. Under this layout method, the bottleneck of the layout area has been reached. If only reducing the layout area from a physical perspective blindly, antenna occlusion will inevitably occur, resulting in mutual interference between the two-band antennas, directly affecting the passing of hard indicators such as the radiation pattern, isolation, and standing wave. Therefore, it is very difficult to further reduce the volume of the entire base station antenna under the existing traditional technical system. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a structure for reducing the layout area of mobile communication base station antennas.

[0004] To solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A structure for reducing the layout area of mobile communication base station antennas includes two radiation units and a high-frequency radiation unit; the two radiation units are orthogonally symmetrically distributed at 90°, and the radiation units are located above the high-frequency radiation unit.

[0006] A further technical solution of it is that the distance between the two radiation units is 2 mm - 10 mm.

[0007] A further technical solution of it is that the two radiation units and the high-frequency radiation unit are connected through a balun structure.

[0008] A further technical solution of it is that the operating frequency of the radiation unit is 698 MHz - 960 MHz.

[0009] A further technical solution of it is that the radiation unit includes two identical oscillator arms, and the two oscillator arms are arranged diagonally.

[0010] A further technical solution of it is that the oscillator arm is composed of 4 FSS periodic modules.

[0011] A further technical solution of it is that the operating frequency of the FSS periodic module is 1.7 GHz - 2.7 GHz.

[0012] Its further technical solution is that: the FSS periodic module is a square PCB board.

[0013] Its further technical solution is that: the relative dielectric constant of the PCB board is 3 or 5.

[0014] Its further technical solution is that: the PCB board is further provided with an inner square patch and a peripheral border. The side length of the PCB board is 40 mm - 44 mm, the side length of the inner square patch is 22 mm - 26 mm, and the width of the peripheral border is 0.3 mm - 0.5 mm.

[0015] The beneficial effect of the present invention compared with the prior art is that: by making the FSS periodic module into an antenna radiation unit and utilizing the spatial filtering characteristic of the FSS, the mutual interference between the high and low frequency radiation units is reduced, so that the overall volume of the base station antenna can be further reduced, while ensuring the technical indicators of each radiation unit and the overall base station antenna.

[0016] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 Schematic diagram of the structure for reducing the layout area of a mobile communication base station antenna provided by the present invention Figure 1 ;

[0019] Figure 2 Schematic diagram of the structure for reducing the layout area of a mobile communication base station antenna provided by the present invention Figure 2 ;

[0020] Figure 3 Schematic diagram of the FSS periodic module provided by the present invention. Detailed Embodiments

[0021] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present invention.

[0023] In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

[0024] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality of" means two or more unless otherwise specifically defined.

[0025] In the present invention, unless otherwise clearly defined and limited, the terms "mounted", "connected", "connected with", "fixed" and the like should be construed in a broad sense. For example, it may be a connection, a detachable connection, or an integral body; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath" and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely means that the horizontal height of the first feature is lower than that of the second feature.

[0027] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms should not be understood as necessarily referring to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.

[0028] As Figures 1 to 3 shown, a specific embodiment of a structure for reducing the layout area of a mobile communication base station antenna is disclosed, including two radiation units 10 and a high-frequency radiation unit 20; the two radiation units 10 are orthogonally symmetrically distributed at 90°, and the radiation unit 10 is located above the high-frequency radiation unit 20. In this way, two radiation units 10 with ±45° dual polarization are formed.

[0029] Among them, FSS: that is, Frequency Selective Surface, is a two-dimensional or three-dimensional artificial metal periodic array structure; it exhibits obvious band-pass or band-stop filtering characteristics through interaction with electromagnetic waves to achieve the function of spatial filtering.

[0030] Antenna radiation unit: refers to the array element in an array antenna. Usually, an array antenna is composed of several radiation units arranged in a certain pattern in space.

[0031] Among them, in this embodiment, the radiation unit 10 is a low-frequency radiation unit.

[0032] Among them, as Figures 1 to 2 shown, the distance between the two radiation units 10 is 2 mm - 10 mm, and in actual application, it can be adjusted and determined according to the input impedance of the radiation unit 10 and the specific form of the balun structure 30.

[0033] Among them, as Figures 1 to 2 shown, the two radiation units 10 and the high-frequency radiation unit 20 are connected through a balun structure 30, and the balun structure 30 also serves as a support structure for the radiation unit 10 and is fixed to the bottom reflector 40.

[0034] Among them, in this embodiment, the operating frequency of the radiation unit 10 is 698 MHz - 960 MHz, and the communication effect is good.

[0035] In other embodiments, the operating frequency of the radiation unit 10 is not limited to the frequency band described in the present invention, and can be designed into other frequency bands according to design requirements; for example, 500 MHz or 1000 MHz, etc.

[0036] Among them, as Figures 1 to 2 shown, the radiation unit 10 includes two identical oscillator arms 11, the two oscillator arms 11 are arranged diagonally, each oscillator arm 11 is composed of FSS periodic modules 111 combined in a two-dimensional plane, and every 2×2 = 4 FSS periodic modules 111 form an oscillator arm 11 of the radiation unit 10. The two identical oscillator arms 11 arranged diagonally form a radiation unit 10, sharing 8 FSS periodic modules 111; and another radiation unit 10 is obtained in the same way and is orthogonally symmetric with the previous radiation unit 10 at 90°.

[0037] Among them, the oscillator arm 11 is composed of 4 FSS periodic modules 111, and the communication effect is good.

[0038] In other embodiments, the number of FSS periodic modules 111 used in the oscillator arm 11 is not limited to 4 in the present invention, and can be designed according to actual needs, for example: 6 or 8, etc., to adapt to different application scenarios.

[0039] Among them, in this embodiment, the operating frequency of the FSS periodic module 111 is 1.7 GHz - 2.7 GHz. Within this frequency band, S12 is all above -0.5 dB, and S11 is all below -10 dB, and the communication effect is good; and the insertion loss is all less than 0.5 dB, and the relative bandwidth reaches 45.4%, belonging to broadband FSS. This is relatively excellent in the single-layer FSS structure. In other words, the present invention objectively also provides a design product of a single-layer broadband FSS.

[0040] In other embodiments, the operating frequency of the FSS periodic module 111 is not limited to the frequency band described in the present invention, and the required passband can be designed according to actual needs.

[0041] Among them, as Figures 1 to 3 shown, the FSS periodic module 111 is a square PCB board, using a single layer, and the thickness of the PCB board is 0.76 mm - 0.80 mm.

[0042] In other embodiments, in order to increase the operating bandwidth of the FSS itself, a double-layer or multi-layer structure can also be adopted.

[0043] Among them, the relative dielectric constant of the PCB board is 3 or 5, and other relative dielectric constants can also be adopted according to needs.

[0044] Among them, as Figures 1 to 3As shown, the PCB board is also provided with an inner square patch 1111 and a peripheral frame 1112. The side length of the PCB board is 40 mm - 44 mm, the side length of the inner square patch 1111 is 22 mm - 26 mm, and the width of the peripheral frame 1112 is 0.3 mm - 0.5 mm, which can enable the low-frequency band to resonate fully.

[0045] In other embodiments, the inner square patch 1111 can also adopt structures such as hexagon, circle, triangle, etc. to adapt to different application scenarios.

[0046] Aiming at the bottleneck encountered in the miniaturized layout of current base station antennas, the present invention breaks new ground and proposes a unique solution idea, which is an innovation in thinking. The FSS surface structure is made into an antenna radiation unit, and by utilizing the spatial filtering characteristics of the FSS, the interference between the radiation units in the high and low frequency bands is overcome, and the radiation unit in the low frequency band is equivalent to a spatial band-pass filter for the high frequency band. Thus, the overall volume of the base station antenna can be further reduced, and at the same time, the technical indicators of each radiation unit and the overall base station antenna are ensured.

[0047] The above embodiments are the preferred implementation solutions of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the present technical solution is within the protection scope of the present invention.

Claims

1. A structure for reducing the layout area of a mobile communication base station antenna, characterized in that It includes two radiation units and a high-frequency radiation unit; the two radiation units are orthogonally symmetrically distributed at 90°, and the radiation units are located above the high-frequency radiation unit; each radiation unit includes two identical oscillator arms, the two oscillator arms are arranged diagonally, each oscillator arm is composed of FSS periodic modules combined in a two-dimensional plane, and every 2×2 = 4 FSS periodic modules form an oscillator arm of a radiation unit. The two identical oscillator arms arranged diagonally form a radiation unit, sharing 8 FSS periodic modules; and the other radiation unit is orthogonally symmetric with the previous radiation unit at 90°; the working frequency of the FSS periodic module is 1.7 GHz - 2.7 GHz.

2. The structure for reducing the layout area of a mobile communication base station antenna according to claim 1, characterized in that, The distance between the two radiation units is 2 mm - 10 mm.

3. A structure for reducing the layout area of a mobile communication base station antenna according to claim 1, characterized in that, The two radiation units and the high-frequency radiation unit are connected through a balun structure.

4. A structure for reducing the layout area of a mobile communication base station antenna according to claim 1, characterized in that, The working frequency of the radiation unit is 698 MHz - 960 MHz.

5. A structure for reducing the layout area of a mobile communication base station antenna according to claim 1, characterized in that, The FSS periodic module is a square PCB board.

6. The structure for reducing the layout area of a mobile communication base station antenna according to claim 5, wherein, The relative dielectric constant of the PCB board is 3 or 5.

7. A structure for reducing the layout area of a mobile communication base station antenna according to claim 5, characterized in that The PCB board is also provided with an inner square patch and a peripheral border. The side length of the PCB board is 40 mm - 44 mm, the side length of the inner square patch is 22 mm - 26 mm, and the width of the peripheral border is 0.3 mm - 0.5 mm.

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