阅读说明：本技术 柱状波束赋型天线及通信设备 (Columnar beamforming antenna and communication equipment ) 是由 唐炜坤 曾进荣 韦河 安涛 王立强 于 2020-11-17 设计创作，主要内容包括：本发明提供了一种柱状波束赋型天线及通信设备,涉及天线技术领域,该柱状波束赋型天线包括：主反射板,以及,设置在主反射板上的多个辐射单元,辐射单元用于进行信号辐射；其中,辐射单元包括组成第一阵列的第一辐射单元和组成第二阵列的第二辐射单元；第一阵列包括的第一辐射单元在主反射板上按照方形阵列排布,以组成方形阵列；第二阵列包括的第二辐射单元按照预设的分布方式设置在第一阵列的外围。本发明提供的柱状波束赋型天线及通信设备,通过上述灵活的阵列布局,可以采用较少的辐射单元数量,有效减少了天线体积,同时也可以灵活匹配组阵当中的辐射单元的幅度和相位,实现不同波束宽度的快速跌落,具有良好柱状矩形赋型效果。(The invention provides a columnar beam forming antenna and communication equipment, relating to the technical field of antennas, wherein the columnar beam forming antenna comprises: the radiation unit is used for carrying out signal radiation; the radiation units comprise a first radiation unit forming a first array and a second radiation unit forming a second array; the first radiating units included in the first array are arranged on the main reflecting plate according to a square array to form the square array; the second radiating elements included in the second array are arranged on the periphery of the first array according to a preset distribution mode. According to the columnar beamforming antenna and the communication equipment, the number of the radiation units can be reduced by the flexible array layout, the size of the antenna is effectively reduced, the amplitude and the phase of the radiation units in the array can be flexibly matched, the rapid falling of different beam widths is realized, and a good columnar rectangular beamforming effect is achieved.)

1. A cylindrical beamforming antenna, comprising: the radiation unit comprises a main reflecting plate and a plurality of radiation units arranged on the main reflecting plate, wherein the radiation units are used for signal radiation;

the radiation units comprise a first radiation unit forming a first array and a second radiation unit forming a second array;

the first radiating units included in the first array are arranged on the main reflecting plate according to a square array to form a square array;

the second radiating elements included in the second array are arranged on the periphery of the first array according to a preset distribution mode.

2. The cylindrical beamforming antenna of claim 1, wherein the first array comprises four of the first radiating elements;

the first radiating elements form a2 x 2 square array.

3. The cylindrical beamforming antenna according to claim 2, wherein the second radiating elements are uniformly distributed in an epitaxial direction of the square array;

and two second radiation units are arranged in the extension direction corresponding to each side of the square array.

4. The cylindrical beamforming antenna according to claim 1, wherein the excitation amplitudes of the first radiating elements are equal; the excitation amplitudes of the second radiation units are equal;

the phases of a plurality of the radiation units included in the first array and the second array are equal.

5. The cylindrical beamforming antenna according to claim 1, wherein the first radiation elements form the square array with equal spacing therebetween, and the spacing ranges from 0.6 λ to 0.8 λ, where λ is a central operating frequency of the cylindrical beamforming antenna.

6. The cylindrical beamforming antenna according to claim 3, wherein, in the second array, a distance between two second radiation elements disposed in the extension direction corresponding to each side of the square array is 1 λ -1.4 λ, and a distance between the two second radiation elements and the first radiation element in the corresponding direction is 0.85 λ -1.6 λ, where λ is a central operating frequency of the cylindrical beamforming antenna.

7. The cylindrical beamforming antenna according to any one of claims 1 to 6, further comprising a spacer disposed on the main reflection plate for isolating the first radiation element and/or the second radiation element.

8. The pillar beamforming antenna of claim 1, further comprising a connector assembly disposed on the main reflector.

9. The cylinder beamforming antenna according to claim 8, further comprising a housing, wherein the cylinder beamforming antenna is disposed in the housing, and wherein one of the outer surfaces of the housing is further provided with a through hole matching with the connector assembly.

10. A communication device, characterized in that the communication device is provided with the column beamforming antenna according to any of claims 1 to 9.

Technical Field

The invention relates to the technical field of antennas, in particular to a columnar beamforming antenna and communication equipment.

Background

At present, the wireless coverage demand of large-scale stadiums at home and abroad is increased sharply, and the coverage of conventional antenna signals cannot meet the use of high-density people.

In order to improve the signal coverage efficiency and the communication capacity, accurate coverage needs to be performed in different areas for venue signal coverage, so that the interference of adjacent areas is reduced, and the frequency reuse efficiency is improved. For this reason, special requirements are required for the antenna beam, which generally requires that the radiation beam be approximately cylindrical, approximately rectangular in cross-section, and that the 3dB beamwidth to 20dB beamwidth fall off quickly. Conventional patch antennas tend to implement beamforming by weighting the amplitude and phase of the elements by a rectangular array. However, the actual shaping effect is not ideal, the number of units is large, the overall size is too large, and the like, so that the design requirement is difficult to meet.

Disclosure of Invention

It is therefore an object of the present invention to provide a column beamforming antenna and a communication device, so as to alleviate the above technical problems.

In a first aspect, an embodiment of the present invention provides a column beamforming antenna, including: the radiation unit comprises a main reflecting plate and a plurality of radiation units arranged on the main reflecting plate, wherein the radiation units are used for signal radiation; the radiation units comprise a first radiation unit forming a first array and a second radiation unit forming a second array; the first radiating units included in the first array are arranged on the main reflecting plate according to a square array to form a square array; the second radiating elements included in the second array are arranged on the periphery of the first array according to a preset distribution mode.

With reference to the first aspect, an embodiment of the present invention provides a first possible implementation manner of the first aspect, where the first array includes four first radiation units; the first radiating elements form a2 x 2 square array.

With reference to the first possible implementation manner of the first aspect, an embodiment of the present invention provides a second possible implementation manner of the first aspect, wherein the second radiation units are uniformly distributed in an epitaxial direction of the square array; and two second radiation units are arranged in the extension direction corresponding to each side of the square array.

With reference to the first aspect, an embodiment of the present invention provides a third possible implementation manner of the first aspect, wherein excitation amplitudes of the plurality of first radiation elements are equal; the excitation amplitudes of the second radiation units are equal; the phases of a plurality of the radiation units included in the first array and the second array are equal.

With reference to the first aspect, an embodiment of the present invention provides a fourth possible implementation manner of the first aspect, where when the first radiation units form the square array, pitches between the first radiation units are equal, and a range of the pitches is 0.6 λ to 0.8 λ, where λ is a central operating frequency of the columnar beamforming antenna.

With reference to the second possible implementation manner of the first aspect, an embodiment of the present invention provides a fifth possible implementation manner of the first aspect, where in the second array, a distance between two second radiation units arranged in the epitaxial direction corresponding to each side of the square array is 1 λ -1.4 λ, and a distance between the two second radiation units and the first radiation unit in the corresponding direction is 0.85 λ -1.6 λ, where λ is a central operating frequency of the column beamforming antenna.

With reference to the first aspect and the first to fifth possible implementation manners of the first aspect, an embodiment of the present invention provides a sixth possible implementation manner of the first aspect, wherein the column beamforming antenna further includes a spacer, and the spacer is disposed on the main reflection plate and is used for isolating the first radiation unit and/or the second radiation unit.

With reference to the first aspect, an embodiment of the present invention provides a seventh possible implementation manner of the first aspect, where the column beamforming antenna further includes a joint component disposed on the main reflection plate.

With reference to the seventh possible implementation manner of the first aspect, an embodiment of the present invention provides an eighth possible implementation manner of the first aspect, where the pillar-shaped beamforming antenna further includes a housing, the pillar-shaped beamforming antenna is disposed in the housing, and one of outer surfaces of the housing is further provided with a through hole matching with the connector assembly.

In a second aspect, an embodiment of the present invention further provides a communication device, where the communication device is configured with the column beamforming antenna described in the first aspect.

The embodiment of the invention has the following beneficial effects:

the columnar beamforming antenna and the communication equipment provided by the embodiment of the invention comprise a main reflecting plate and a plurality of radiating units arranged on the main reflecting plate, wherein each radiating unit comprises a first radiating unit forming a first array and a second radiating unit forming a second array; the first radiating units included in the first array are arranged on the main reflecting plate according to a square array to form the square array; the second radiating element that the second array includes sets up the periphery at first array according to predetermined distribution mode, through above-mentioned nimble array layout, can adopt less radiating element quantity, the antenna volume has effectively been reduced, therefore, compare in prior art product and possess great advantage, and also have apparent advantage in the aspect of building the tower and maintaining the cost in the future, and simultaneously, also can nimble matching through above-mentioned array layout and organize radiating element's in the middle of the array amplitude and phase place, realize falling fast of different beam width, good column rectangle shaping effect has, and the coverage effect, the multiplexing efficiency of frequency has effectively been promoted.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic structural diagram of a column beamforming antenna according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of another column-shaped beamforming antenna according to an embodiment of the present invention;

fig. 3 is a schematic radiation diagram of a cylindrical beamforming antenna according to an embodiment of the present invention;

fig. 4 is a schematic radiation diagram of another cylindrical beamforming antenna according to an embodiment of the present invention;

FIG. 5 is a radiation pattern waveform provided by an embodiment of the present invention;

fig. 6 is a schematic structural diagram of another column-shaped beamforming antenna according to an embodiment of the present invention;

fig. 7 is a schematic perspective view of a cylindrical beamforming antenna according to an embodiment of the present invention;

fig. 8 is an exploded view of a cylindrical beamforming antenna according to an embodiment of the present invention;

fig. 9 is an assembly diagram of a column beamforming antenna according to an embodiment of the present invention.

Reference numerals: 10-a main reflector; 20-a radiating element; 201-a first radiating element; 202-a second radiating element; 203-a joint assembly; 204-a first spacer; 205-a second spacer; 701-an outer cover; 702-an upper end cap; 703-lower end cap; 704-a housing support; 705-clamp mount; 706-power divider; 707-split support.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Currently, conventional plate antennas often implement beamforming by weighting the amplitude and phase of the elements by a rectangular array. However, the method has the disadvantages of unsatisfactory actual forming effect, large number of units, overlarge overall size and the like. Therefore, a new cylindrical rectangular antenna needs to be researched and optimized, and the good 3dB to 20dB beam width fast drop roll-off degree can be ensured while the number of units is reduced and the size of the whole machine is reduced. The method has important significance for improving the communication coverage efficiency.

Based on this, the columnar beamforming antenna and the communication device provided by the embodiment of the invention can effectively meet the current market demand and have important significance for improving the communication coverage efficiency.

For the convenience of understanding the present embodiment, a detailed description will be given to a cylindrical beamforming antenna disclosed in the present embodiment.

In a possible implementation manner, an embodiment of the present invention provides a column beamforming antenna, where fig. 1 illustrates a schematic structural diagram of a column beamforming antenna, as shown in fig. 1, including a main reflection plate 10, and a plurality of radiation units disposed on the main reflection plate, where the radiation units are configured to perform signal radiation.

Wherein the radiation units comprise a first radiation unit 201 constituting a first array and a second radiation unit 202 constituting a second array;

specifically, as shown in fig. 1, the first array includes first radiation units 201 arranged in a square array on the main reflection plate to form a square array;

the second array includes second radiating elements 202 arranged in a predetermined distribution around the first array.

For convenience of illustration, fig. 1 shows only a limited number of radiation units, and a limited number of first and second arrays, and the first array is illustrated by taking a minimum square array as an example. In practical use, the number of the radiation units and the size of the main reflective plate may be set according to practical design requirements, which is not limited in the embodiment of the present invention.

The columnar beamforming antenna provided by the embodiment of the invention comprises a main reflecting plate and a plurality of radiation units arranged on the main reflecting plate, wherein each radiation unit comprises a first radiation unit forming a first array and a second radiation unit forming a second array; the first radiating units included in the first array are arranged on the main reflecting plate according to a square array to form the square array; the second radiating element that the second array includes sets up the periphery at first array according to predetermined distribution mode, through above-mentioned nimble array layout, can adopt less radiating element quantity, the antenna volume has effectively been reduced, therefore, compare in prior art product and possess great advantage, and also have apparent advantage in the aspect of building the tower and maintaining the cost in the future, and simultaneously, also can nimble matching through above-mentioned array layout and organize radiating element's in the middle of the array amplitude and phase place, realize falling fast of different beam width, good column rectangle shaping effect has, and the coverage effect, the multiplexing efficiency of frequency has effectively been promoted.

In practical use, the main reflection plate is usually provided with a fixing member for fixing the first radiation unit and the second radiation unit, so as to realize the fixed and detachable connection between the first radiation unit and the second radiation unit and the main reflection plate, and realize the array arrangement of the first radiation unit and the second radiation unit on the main reflection plate.

Further, by the array arrangement of the radiation units shown in fig. 1, the coverage requirement of the antenna can be realized by using a small number of radiation units, and the first array of the commonly used columnar beamforming antenna generally only includes four first radiation units; and, the first radiation units constitute a2 × 2 square array. Specifically, fig. 2 shows a schematic structural diagram of another column beamforming antenna, where the column beamforming antenna shown in fig. 2 is a common column beamforming antenna, and generally includes only two first arrays, and a second array disposed on the periphery of the first arrays.

In the column beamforming antenna shown in fig. 2, the main reflector 10, the first radiation elements 201 forming a2 × 2 square array, and the second radiation elements 202 forming a second array at the periphery of the first array are included, and the second radiation elements 202 are uniformly distributed in the extension direction of the square array; and two second radiation units are arranged in the extension direction corresponding to each edge of the square array.

Specifically, the column beamforming antenna shown in fig. 2 includes two arrays: the array comprises a first array and a second array, wherein the first array is a square array of 2 multiplied by 2 units; the second array is formed by respectively adding two second radiating units on the upper, lower, left and right sides of the first array to form an approximate octagonal arrangement mode, and the volume of the whole columnar beam forming antenna is smaller by adopting a small number of radiating units through the special array layout shown in figure 2.

Further, the excitation amplitudes of the plurality of first radiation units are equal; the excitation amplitudes of the plurality of second radiation units are equal; and the phases of a plurality of radiation units included in the first array and the second array are equal.

Specifically, taking the column beamforming antenna shown in fig. 2 as an example, the excitation amplitude of each radiation element in the corresponding arrays of the first array and the second array is the same, and the phases between the radiation elements of the first array and the second array are equal; specifically, in the first array, the excitation amplitude of each radiation unit is equal; in the second array, the excitation amplitude of each radiation unit is equal; the excitation amplitudes of the radiation elements of the first array and the radiation elements of the second array may be equal or different, and may be specifically set according to actual conditions.

Furthermore, the phases of the first array and the second array are consistent, and different 3dB beam widths and different level roll-off degrees of 3dB to 20dB beam widths can be obtained by giving different excitation amplitudes to the first array and the second array, and meanwhile, better side lobe suppression and front-to-back ratio can be obtained. Therefore, the column-shaped beamforming antenna provided by the embodiment of the invention is a column-shaped beamforming antenna with a 3dB beam width to 20dB beam width falling off rapidly.

In practical use, the radiation elements in the first array and the second array may be half-wave arrays polarized at ± 45 °, or patch radiation elements, which may be specifically set according to practical use conditions, and the embodiment of the present invention is not limited thereto.

Further, when the first radiating elements form a square array, the distances between the first radiating elements are equal, and the range of the distances is 0.6 λ -0.8 λ, where λ is the central operating frequency of the cylindrical beamforming antenna.

Further, in the second array, a distance between two second radiation units arranged in the epitaxial direction corresponding to each side of the square array is 1 λ -1.4 λ, and a distance between the two second radiation units and the first radiation unit in the corresponding direction is 0.85 λ -1.6 λ, where λ is a central operating frequency of the columnar beamforming antenna.

Specifically, taking the column beamforming antenna shown in fig. 2 as an example, in the first array, the horizontal cell pitch and the vertical cell pitch are required to be equal, and the pitch is 0.6 λ -0.8 λ, in the second array, the pitch between two radiation cells in the up, down, left and right directions corresponding to the first array is 1 λ -1.4 λ, and the horizontal or vertical pitch corresponding to the radiation cell in the first array is 0.85 λ -1.6 λ, where λ is the central operating frequency of the antenna.

Based on the above setting manner, the working frequency range of the columnar beamforming antenna can reach 1710MHz to 2170MHz, taking a half-wave array with a polarization manner of ± 45 ° as an example of a radiation unit, the position of each radiation unit can be represented by xoy coordinates in the overall array layout, and taking the center of a first array as an origin of coordinates, the coordinates of the center position of each radiation unit included in the first array are as follows: a first array: a1(-37.5, 37.5), a2(37.5 ), a3(-37.5 ), a4(37.5, -37.5), with the unit being mm, wherein a 1-a 4 are the central positions of the four first radiation elements included in the first array.

Further, based on the coordinates of the center positions of the respective radiation elements of the first array, the coordinates of the center positions of the second radiation elements included in the second array disposed at the periphery of the first array may be set to: b1(-117.5, 127.5), b2(117.5, 127.5), b3(127.5, 117.5), b4(127.5, -117.5), b5(117.5, -127.5), b6(-117.5, -127.5), b7(-127.5, -117.5), b8(-127.5, 117.5, in mm, wherein b 1-b 8 is the central position of eight second radiation units included in the second array.

In actual use, the position of each of the first radiation element and the second radiation element on the main reflection plate may be set in accordance with the position shown by the center position coordinates shown in fig. 2 of the pillar-shaped beamforming antenna. Specifically, the excitation amplitude of the first array can be maximized, the excitation given to each radiation element of the first array is set to be 0dB, the excitation given to each radiation element of the second array is set to be-3 dB, and the phases of the first array and the second array are equal, so that fig. 3 and 4 respectively show the radiation diagrams of the pillar beamforming antenna, and specifically respectively show the H-plane and V-plane sectional 2D patterns representing the working frequency band of 1710 and 2170 MHz.

Further, fig. 5 shows a radiation pattern waveform, specifically, fig. 5 is a 3-dimensional radiation pattern waveform taken at 1940MHz, it can be seen that the cross section of the top of the beam radiation is approximately rectangular, and the side surfaces H and V are also similar to cylindrical, so that the cylindrical beamforming antenna provided by the above embodiment of the present invention can achieve a fast fall of the 3dB wave width to 20dB wave width after fewer radiation units are adopted, the beamforming is better, and the suppression of the side lobe of the total radiation space is less than or equal to-25 dB.

Further, in order to facilitate use and assembly of the pillar-shaped beamforming antenna, the pillar-shaped beamforming antenna further includes a connector assembly disposed on the main reflection plate. Specifically, on the basis of fig. 2, fig. 6 shows a schematic structural diagram of another cylindrical beamforming antenna, which includes a connector assembly 203 in addition to the structure shown in fig. 2.

Further, the above-mentioned column-shaped beamforming antenna further includes a spacer, and the spacer is disposed on the main reflection plate and used for isolating the first radiation unit and/or the second radiation unit, so as to reduce interference of neighboring cells and improve frequency reuse efficiency.

Specifically, the above-mentioned separator includes a first separator for separating between the first radiation units and a second separator for separating between the second radiation units, which can not only separate the interference between the first radiation units and the first radiation units, but also separate the interference between the second radiation units and the second radiation units, and the interference between the first radiation units and the second radiation units. For example, based on fig. 6, fig. 7 shows a schematic perspective structure of a column-shaped beamforming antenna, and in addition to the structure shown in fig. 3, a first spacer 204 and a second spacer 205 are further shown for isolating the first radiation unit and/or the second radiation unit to reduce interference in the neighboring area.

In practical use, in order to facilitate installation and setting of the column-shaped beamforming antenna and implement signal coverage of a large venue, a matching housing is usually provided for the column-shaped beamforming antenna, and therefore, the column-shaped beamforming antenna provided by the embodiment of the present invention further includes a housing, the column-shaped beamforming antenna is provided in the housing, and one of outer surfaces of the housing is further provided with a through hole matching with the connector assembly.

Specifically, the housing generally includes an outer cover, and an upper end cover and a lower end cover, where the outer cover, the upper end cover and the lower end cover enclose a cavity for placing the pillar-shaped beamforming antenna, and on a main reflection plate of the pillar-shaped beamforming antenna, the housing may further include an outer cover support, a clamp mount, and other split supports, etc. for mounting and fixing the pillar-shaped beamforming antenna.

In addition, in order to implement the signal radiation function of the column beamforming antenna, the column beamforming antenna further includes a power divider and the like. For easy understanding, on the basis of fig. 7, fig. 8 further illustrates an exploded view of a pillar-shaped beamforming antenna, which includes a main reflection plate 10, a radiation unit 20, a connector assembly 203, an outer cover 701, an upper end cover 702, a lower end cover 703, an outer cover support 704, a clamp mount 705, a power divider 706, a split-type support 707, and the like, and after assembling the respective structures, the pillar-shaped beamforming antenna according to the embodiment of the present invention is formed, specifically, fig. 9 further illustrates an assembly diagram of the pillar-shaped beamforming antenna, and further illustrates a first spacer 204 and a second spacer 205 in addition to the structure illustrated in fig. 8.

Based on the above-mentioned column beamforming antenna, the column beamforming antenna according to the embodiment of the present invention has the following advantages compared with the prior art:

(1) the columnar beamforming antenna disclosed by the embodiment of the invention adopts flexible array arrangement and unequal-interval combination, can flexibly match amplitude and phase in an array, realizes different 3dB beam widths and 3dB to 20dB beam width fast drop, has good columnar rectangular beamforming effect and covering effect, can effectively reduce adjacent interval signal interference, and improves frequency multiplexing efficiency.

(2) The columnar beamforming antenna disclosed by the embodiment of the invention adopts a small number of radiation units, has a great advantage in the whole volume compared with the product in the prior art, has a remarkable advantage in the aspects of building a station tower and maintaining cost in the future, and is smaller in volume and higher in concealment compared with the existing rectangular beamforming antenna.

(3) According to the columnar beam forming antenna disclosed by the embodiment of the invention, the feed network can be used by one or a combination of a micro-strip microwave network, a Wilkinson power divider or a micro-strip directional coupler, the feed mode is simpler, and the engineering realization degree is high.

Therefore, the columnar beamforming antenna provided by the embodiment of the invention can solve the problem that the wireless coverage requirement rapidly rises when a large-scale activity is carried out in a large-scale venue at present, the signal coverage of a conventional antenna often cannot meet the use condition of high-density people, the signal coverage efficiency and the communication capacity are improved, the signal coverage of the venue can be divided into regions and accurately covered, the interference of adjacent regions is reduced, the frequency reuse efficiency is improved, the cost is lower, the requirement of the current low-cost market is met, and the columnar beamforming antenna has a wide market prospect in important significance for improving the communication coverage efficiency.

Further, on the basis of the above embodiments, embodiments of the present invention also provide a communication apparatus configured with the column beamforming antenna provided by the above embodiments.

The communication device provided by the embodiment of the present invention has the same technical features as the column-shaped beamforming antenna provided by the above embodiment, so that the same technical problems can be solved, and the same technical effects can be achieved.

It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working process of the communication device described above may refer to the corresponding process in the foregoing embodiment, and is not described herein again.

In addition, in the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases for those skilled in the art.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that the following embodiments are merely illustrative of the present invention, and not restrictive, and the scope of the present invention is not limited thereto: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.