A recessed radiation element and antenna

Abstract

This invention discloses a recessed radiating element and antenna in the field of mobile communication antennas. It addresses the problem that existing methods, which increase the size of the radiating element or employ complex external structures to solve the mutual coupling problem when array spacing is reduced, easily lead to increased mutual coupling between different frequency bands and deterioration of other key radiation indicators. The invention includes a low-frequency radiating element, within which a recessed radiating element is installed. The recessed radiating element comprises four radiating arm portions and four radiating arm portions two in a L-shape, and the radiating arm portions one and two in different planes. This invention reduces the aperture of the radiating element by indenting the radiating arms inward along the polarization direction, effectively reducing mutual coupling between arrays and polarizations in multi-frequency arrays.

Description

Technical Field

[0001] This invention relates to the field of mobile communication antennas, and more particularly to a recessed radiating element and antenna. Background Technology

[0002] With the continuous advancement of mobile communication technology, the integration of multiple systems and standards has become a major trend in antenna design. To meet this demand, multiple arrays are usually integrated on the same antenna, while ensuring that the antenna cross-section is as small as possible to adapt to the limited windward area. Such requirements make the internal structure of the antenna more compact, and the spacing between arrays is forced to decrease, resulting in serious mutual coupling. This not only affects the radiation performance of the antenna, but also reduces the quality of network coverage.

[0003] To address the mutual coupling problem that arises when array spacing is reduced, existing methods typically achieve wideband operation by increasing the size of the radiating elements or employing complex external loading structures. However, this approach can easily lead to increased mutual coupling between different frequency bands and may worsen other key radiation parameters, such as beam directivity and cross-polarization ratio, ultimately resulting in a decrease in the overall radiation efficiency of the antenna. Summary of the Invention

[0004] To overcome the shortcomings of existing methods that increase the size of the radiating element or adopt complex external structures to solve the mutual coupling problem when the array spacing is reduced, which easily leads to increased mutual coupling between different frequency bands and deterioration of other key radiation indicators, this invention provides a recessed radiating element and antenna.

[0005] The technical implementation of the present invention is as follows: a recessed radiation unit, comprising: a low-frequency radiation unit, wherein a recessed radiation unit is installed inside the low-frequency radiation unit, and the recessed radiation unit comprises four radiation arm part one and four radiation arm part two, wherein the radiation arm part one and the radiation arm part two are both L-shaped structures, and the radiation arm part one and the radiation arm part two belong to different planes.

[0006] Furthermore, it also includes: an inverted U-shaped loading arm, twice the number of the first part of the radiation arm, disposed on the recessed radiation unit, wherein the end of the first part of the radiation arm is connected to the end of the adjacent second part of the radiation arm via the inverted U-shaped loading arm.

[0007] An antenna employing the aforementioned recessed radiating element, the antenna comprising: an antenna housing, wherein two main mounting seats are fixedly connected to the antenna housing, a rear mounting seat is rotatably connected to the lower main mounting seat, and a rear fixing seat is bolted to the rear mounting seat; a support arm disposed on the upper main mounting seat, a swing arm rotatably connected to the support arm, a pre-mounting seat rotatably connected to the swing arm, and a pre-fixing seat bolted to the pre-mounting seat; a movable block slidably connected to the swing arm, an adjusting member rotatably connected to the swing arm, the adjusting member being threadedly connected to the movable block, and a connecting member rotatably connected to the support arm, the connecting member being hinged to the movable block.

[0008] Furthermore, the connector is triangular in shape to increase the stability between the support arm and the adjacent swing arm.

[0009] Furthermore, it also includes: two supporting arc blocks, wherein the supporting arm is provided with a mounting groove at the position where it contacts the adjacent main mounting base, and the supporting arc block is fixed to the side of the supporting arm near the mounting groove; a supporting plate, rotatably connected in the mounting groove, the supporting plate is slidably connected to the supporting arc block, and the supporting plate is fixedly connected with an elastic plate fixed to the supporting arm.

[0010] Furthermore, it also includes: a limiting piece, fixed to the side of the support arm near the support piece, the support piece being provided with a limiting groove, the limiting piece limiting the support piece through the limiting groove.

[0011] Furthermore, the rear mounting base, the rear fixing base, the pre-mounting base, and the pre-fixing base are all provided with multiple folding parts, and there are gaps between adjacent folding parts.

[0012] Furthermore, it also includes: four extrusion arc blocks, which are slidably connected to the rear mounting base, the rear fixing base, the pre-mounting base and the pre-fixing base respectively. Each extrusion arc block is provided with an extrusion part, which is used to limit the deformation direction of adjacent folding parts. Each extrusion arc block is fixedly connected to multiple connecting pieces. The rear mounting base, the rear fixing base, the pre-mounting base and the pre-fixing base are respectively fixedly connected to adjacent connecting pieces.

[0013] Furthermore, it also includes: two plug-in plates, both fixedly connected to the pre-fixed base; two pre-installed pieces, respectively fixedly connected to adjacent connecting pieces in the pre-installed base, wherein the plug-in plate is provided with multiple pre-installed slots on the side near the adjacent connecting piece, and the pre-installed piece unidirectionally limits the adjacent plug-in plate through the adjacent pre-installed slots.

[0014] Furthermore, the length of the plug plate in the vertical direction is equal to the length of the inner side of the pre-installation seat in the vertical direction, and the plug plate is used to limit the position of the pre-installation seat.

[0015] The beneficial effects of the above technical solution are as follows: The present invention reduces the aperture of the radiating element by indenting the radiating arm inward along the polarization direction, effectively reducing the mutual coupling between arrays and polarizations in multi-frequency arrays; the use of a threaded drive connector to move and change the angle between the swing arm and the support arm simplifies the antenna tilt adjustment process and ensures the stability of the antenna during use; the support arm, swing arm, and connector form a triangular structure, and the connector itself is also triangular, so that during antenna use, the support arm, swing arm, and connector work together to effectively disperse and balance external forces, allowing the antenna to withstand greater loads; the use of a compression arc block guides the end of the folded part to remain in contact with the tower base mast, which not only accommodates tower base masts of different diameters but also increases the compression area of ​​the folded part on the tower base mast, increasing the force-bearing area between the antenna and the tower base mast, thus ensuring the stability of the antenna during use. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0017] Figure 2 This is a three-dimensional structural diagram of the antenna housing and the recessed radiating element of the present invention;

[0018] Figure 3 This is a three-dimensional structural diagram of the low-frequency radiation unit and the recessed radiation unit of the present invention.

[0019] Figure 4 This is a three-dimensional structural diagram of the recessed radiation unit and the inverted U-shaped loading arm of the present invention;

[0020] Figure 5 This is a three-dimensional structural diagram of the first and second radiation arms of the present invention;

[0021] Figure 6 This is a three-dimensional structural diagram of the main mounting base, rear mounting base, and rear fixing base of the present invention;

[0022] Figure 7 This is a three-dimensional structural diagram of the main mounting base, rear mounting base, and folding part of the present invention.

[0023] Figure 8 This is a three-dimensional structural diagram of the support arm, swing arm, and pre-installation base of the present invention;

[0024] Figure 9 This is a three-dimensional structural diagram of the movable block, adjusting member, and connecting member of the present invention;

[0025] Figure 10 This is an exploded view of the support arm, swing arm, and pre-installation base of the present invention;

[0026] Figure 11 This is a three-dimensional structural diagram of the support arm, support arc block, and support plate of the present invention;

[0027] Figure 12 This is a three-dimensional structural diagram of the support sheet, elastic sheet, and limiting sheet of the present invention;

[0028] Figure 13 This is a three-dimensional structural diagram of the folded part, connecting piece, and extrusion arc block of the present invention;

[0029] Figure 14 This is a three-dimensional structural cross-sectional view of the pre-installation base, pre-fixing base, and plug-in plate of the present invention.

[0030] In the attached diagrams: 100-Low-frequency radiating element, 200-Indented radiating element, 201-Radiating arm part 1, 202-Radiating arm part 2, 203-Inverted U-shaped loading arm, 1-Antenna housing, 2-Main mounting base, 3-Rear mounting base, 4-Rear fixing base, 5-Support arm, 501-Mounting slot, 6-Swing arm, 7-Pre-mounting base, 8-Pre-fixing base, 9-Moving block, 10-Adjusting component, 11-Connector, 12-Support arc block, 13-Support piece, 14-Elastic piece, 15-Limiting piece, 151-Limiting slot, 16-Folding part, 17-Connecting piece, 18-Extrusion arc block, 181-Extrusion part, 19-Plug-in plate, 191-Pre-installation slot, 20-Pre-installation piece. Detailed Implementation

[0031] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description and drawings.

[0032] See Figures 1-5 In one embodiment of the present invention, a recessed radiation unit is proposed, comprising: a low-frequency radiation unit 100, wherein a recessed radiation unit 200 is installed within the low-frequency radiation unit 100, the recessed radiation unit 200 comprising four radiation arm first parts 201 and four radiation arm second parts 202, both of which are L-shaped structures and belong to different planes; and further comprising: twice the number of inverted U-shaped loading arms 203, which are disposed on the recessed radiation unit 200, wherein the ends of the radiation arm first parts 201 and the ends of the adjacent radiation arm second parts 202 are connected by the inverted U-shaped loading arms 203.

[0033] The above solution aims to address the problem that existing methods, such as increasing the size of the radiating element or using complex external structures to solve the mutual coupling problem when the array spacing is reduced, easily lead to increased mutual coupling between different frequency bands and deterioration of other key radiation indicators. This solution reduces the aperture of the radiating element by indenting the radiating arm of the recessed radiating element 200 inward along the polarization direction, effectively reducing mutual coupling between multi-frequency arrays and between polarizations. The inverted U-shaped loading arms 203 are disposed on both sides of the radiating arm of the recessed radiating element 200 along the polarization direction, which can extend the current path and thus achieve broadband operation. The inverted U-shaped loading arm 203 is set upward at the end of the radiating arm to concentrate the current, thereby achieving a more convergent beamwidth and lower cross-polarization. The radiating arm, consisting of radiating arm part 201 and radiating arm part 202, is recessed inward along the polarization direction, reducing the aperture of the recessed radiating element 200. This results in less mutual coupling and better radiation performance, especially higher radiation efficiency, for antennas using the recessed radiating element 200. The outer contour length of the inverted U-shaped loading arm 203 is less than or equal to 0.2 times the wavelength of the center frequency of the operating frequency band of the recessed radiating element 200.

[0034] See Figures 6-10 In one embodiment of the present invention, an antenna is proposed, which applies the aforementioned recessed radiating element. The antenna includes: an antenna housing 1, with two main mounting seats 2 fixedly connected to the antenna housing 1. A rear mounting seat 3 is rotatably connected to the lower main mounting seat 2, and a rear fixing seat 4 is bolted to the rear mounting seat 3; a support arm 5, disposed on the upper main mounting seat 2, with a swing arm 6 rotatably connected to the support arm 5, a pre-mounting seat 7 rotatably connected to the swing arm 6, and a pre-fixing seat 8 bolted to the pre-mounting seat 7; a moving block 9, which is slidably connected to the swing arm 6, with an adjusting member 10 rotatably connected to the swing arm 6. The adjusting member 10 is threadedly connected to the moving block 9, and a connecting member 11 is rotatably connected to the support arm 5. The connecting member 11 is generally triangular and is used to increase the stability between the support arm 5 and the adjacent swing arm 6.

[0035] To optimize the signal coverage of base station antennas and reduce co-channel interference, precise adjustment of the antenna tilt angle is required during installation. Currently, there are two main antenna tilt angle adjustment structures. The first structure consists of two hinged connecting rods and a connecting rod. These two connecting rods are connected to the antenna and the tower base support, respectively. The antenna tilt angle is controlled by adjusting the angle between these two connecting rods. After adjustment, the connecting rod is used to fix the two connecting rods together, thus locking the antenna tilt angle. However, since the optimal antenna tilt angle may need to be adjusted multiple times based on actual conditions, operators are required to repeatedly disassemble and reassemble the connecting rod to change the tilt angle. The process of adjusting the angle between the connecting rods is rather cumbersome. The second structure uses two hinged connecting plates and a bolt. One connecting plate has an arc-shaped groove, and the bolt on the other connecting plate can move within the groove. When the angle between the two connecting plates is adjusted to the desired position, tightening the bolt uses the friction between it and the groove to lock the angle. Although this method simplifies the tilt adjustment process, relying on the friction between the parts to maintain the tilt stability has certain limitations, because external factors such as wind may cause the tilt to change, thus affecting the antenna's performance.

[0036] The above solution aims to address the limitations of existing antenna tilt adjustment structures in practical use. This solution utilizes the rotation of the threaded drive connector 11 to change the angle between the swing arm 6 and the support arm 5. This method simplifies the antenna tilt adjustment process and ensures the stability of the antenna during use. The lower main mounting base 2 and the rear mounting base 3, the support arm 5 and the upper main mounting base 2, the support arm 5 and the swing arm 6, and the swing arm 6 and the pre-mounted base 7 are all connected by bolts. After the final antenna tilt adjustment is completed, the bolts between the main mounting base 2 and the rear mounting base 3, the support arm 5 and the main mounting base 2, the support arm 5 and the swing arm 6, and the swing arm 6 and the pre-mounted base 7 are tightened to secure the main mounting base 2. The rear mounting base 3, the support arm 5 and the main mounting base 2, the support arm 5 and the swing arm 6, and the swing arm 6 and the pre-mounting base 7 are fixed together by the pre-tightening force of the bolts, which increases the stability of the antenna during use. A nut can be threaded onto the adjusting component 10. After the final tilt angle of the antenna is determined, the nut is rotated to press against the moving block 9, locking the relative position between the moving block 9 and the adjusting component 10, further increasing the stability of the antenna during use. The support arm 5, the swing arm 6 and the connecting component 11 are in a triangular structure. The connecting component 11 is also in a triangular structure. In this way, during the use of the antenna, the support arm 5, the swing arm 6 and the connecting component 11 can effectively disperse and balance external forces, so that the antenna can withstand greater loads.

[0037] See Figures 10-12It also includes: two supporting arc blocks 12, with a mounting groove 501 provided at the position where the supporting arm 5 contacts the adjacent main mounting seat 2, and the supporting arc blocks 12 fixed to the side of the supporting arm 5 near the mounting groove 501; a supporting plate 13, rotatably connected in the mounting groove 501, the supporting plate 13 and the supporting arc blocks 12 are slidably connected, and the supporting plate 13 is fixedly connected to an elastic plate 14 fixedly connected to the supporting arm 5; it also includes: a limiting plate 15, fixedly connected to the side of the supporting arm 5 near the supporting plate 13, the supporting plate 13 is provided with a limiting groove 151, and the limiting plate 15 limits the supporting plate 13 through the limiting groove 151.

[0038] Currently, when installing tower-based antennas, the limited space for installers to stand on the tower base means that only one person can install the antenna. Furthermore, the existing antenna and antenna support (i.e., the upper and lower clamps fixed to the tower base pole and the antenna tilt adjustment structure hinged to the upper clamp) are a single unit. During installation, the antenna support clamps must first be temporarily pressed against the tower base pole, and then the antenna must be swung horizontally to adjust its orientation. Only after the antenna is in the designated position can the antenna support clamps be fixed to the tower base pole. Due to the large size and weight of the antenna, adjusting its orientation is difficult for installers. This solution separates the antenna tilt adjustment structure (i.e., support arm 5, swing arm 6, pre-installation seat 7, and pre-fixing seat 8) from the antenna. The orientation of the antenna tilt adjustment structure (i.e., the orientation of the antenna after installation) is adjusted first. Then, the antenna and antenna tilt adjustment structure are installed as a single unit via the mounting slot 501, facilitating installation and adjustment of the antenna's orientation.

[0039] See Figure 13 The rear mounting base 3, the rear fixing base 4, the pre-mounting base 7, and the pre-fixing base 8 are each provided with multiple folding parts 16, and there are gaps between adjacent folding parts 16.

[0040] In the above scheme, the purpose is to use the folding part 16 to enable the rear mounting seat 3, rear fixing seat 4, pre-mounting seat 7, and pre-fixing seat 8 to adapt to tower base masts of different diameters; during the process of fixing the rear mounting seat 3, rear fixing seat 4, pre-mounting seat 7, and pre-fixing seat 8 to the tower base mast, the gap between adjacent folding parts 16 can cause the surface of the tower base mast to undergo slight deformation (similar to the teeth set at the contact position between the existing rear mounting seat 3, rear fixing seat 4, pre-mounting seat 7, and pre-fixing seat 8 and the tower base mast), so that the folding part 16 is "embedded" in the tower base mast, thereby enabling the rear mounting seat 3, rear fixing seat 4, pre-mounting seat 7, and pre-fixing seat 8 to withstand greater circumferential forces without deflection.

[0041] See Figure 13 and Figure 14It also includes: four extrusion arc blocks 18, which are slidably connected in the rear mounting seat 3, the rear fixing seat 4, the pre-mounting seat 7 and the pre-fixing seat 8 respectively. The extrusion arc blocks 18 are provided with extrusion parts 181, which are used to limit the deformation direction of adjacent folding parts 16. Multiple connecting pieces 17 are fixedly connected to the extrusion arc blocks 18. The rear mounting seat 3, the rear fixing seat 4, the pre-mounting seat 7 and the pre-fixing seat 8 are fixedly connected to the adjacent connecting pieces 17 respectively.

[0042] The above solution aims to address the problem that after the folding part 16 is bent to accommodate tower base masts of different diameters, the end of the folding part 16 shifts away from the tower base mast, resulting in a reduced contact area between the folding part 16 and the tower base mast, leading to low antenna stability. This solution utilizes the compression block 18 to guide the end of the folding part 16 to remain in contact with the tower base mast, increasing the contact area between the folding part 16 and the tower base mast. A slope is provided on the side of the end of the folding part 16 away from the tower base mast, and this slope initially contacts the compression part 181, and then... As the folding part 16 bends, the inclined surface of the folding part 16 moves along the extrusion part 181, causing the force of the folding part 16 extruding the tower base mast to gradually increase until the extrusion force exceeds the elastic force and plastic deformation resistance of the connecting piece 17. At this point, the folding part 16 extrudes and drives the extrusion arc block 18 to move. The extrusion arc block 18 extrudes the connecting piece 17 and bends it. This not only adapts to tower base masts of different diameters, but also increases the extrusion area of ​​the folding part 16 on the tower base mast, increasing the force-bearing area between the antenna and the tower base mast, thereby ensuring the stability of the antenna during use.

[0043] See Figure 13 and Figure 14 It also includes: two plug-in plates 19, both fixedly connected to the pre-fixed base 8; two pre-installed pieces 20, respectively fixedly connected to adjacent connecting pieces 17 in the pre-installed base 7; the plug-in plate 19 is provided with a plurality of pre-installed slots 191 on the side near the adjacent connecting piece 17; the pre-installed piece 20 limits the adjacent plug-in plate 19 in one direction through the adjacent pre-installed slots 191; the length of the plug-in plate 19 in the vertical direction is equal to the length of the inner side of the pre-installed base 7 in the vertical direction; the plug-in plate 19 is used to limit the pre-installed base 7.

[0044] The above solution aims to address the following issues: When the existing pre-installation base 7 and pre-fixed base 8 are connected by bolts, the holes for the bolts to pass through are larger than the bolt diameter, causing the pre-installation base 7 and pre-fixed base 8 to be at different horizontal levels during installation. This leads to the pre-installation base 7 and pre-fixed base 8 being prone to detachment when the antenna is subjected to vibration. Furthermore, when pre-installing the antenna tilt adjustment structure onto the tower base mast and adjusting its orientation, multiple adjustments are required, necessitating repeated tightening and loosening of the bolts on the pre-installation base 7 and pre-fixed base 8 by the installers on the tower base, resulting in a cumbersome overall adjustment process. This solution addresses these issues by embedding a connector plate 19 into the pre-installation base 7, utilizing the contact between the upper and lower sides of the connector plate 19 and the inner side of the pre-installation base 7 to ensure the pre-fixed base... Pre-mounting base 8 and pre-installation base 7 are located on the same plane. The pre-installation plate 20 and the plug-in plate 19 are used to temporarily fix the pre-fixing base 8 and the pre-installation base 7, so as to achieve quick fixing and quick loosening adjustment (to loosen, simply move the two plug-in plates 19 in a direction away from each other). After adjustment, the pre-installation base 7 and the pre-fixing base 8 are fixed to the tower base mast with bolts. The plug-in plate 19 and the pre-installation plate 20 are both made of elastic material. The upper and lower parts of the plug-in plate 19 on the side away from the pre-fixing base 8 can be provided with inclined surfaces to guide the plug-in plate 19 into the pre-installation base 7. The plug-in plate 19 and the pre-installation plate 20 can also be provided on the rear mounting base 3 and the rear fixing base 4 so that the rear mounting base 3 and the rear fixing base 4 can be located on the same plane after installation, which increases the stability of the rear mounting base 3 and the rear fixing base 4 after installation.

[0045] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating this application and are not intended to limit the implementation. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this application.

Claims

1. An antenna employing a recessed radiating element, characterized in that the recessed radiating element... The recessed radiating element includes: A low-frequency radiation unit (100) is provided, and an indented radiation unit (200) is installed inside the low-frequency radiation unit (100). The indented radiation unit (200) includes four radiation arm part one (201) and four radiation arm part two (202). The radiation arm part one (201) and the radiation arm part two (202) are both L-shaped structures, and the radiation arm part one (201) and the radiation arm part two (202) belong to different planes. Also includes: The number of inverted U-shaped loading arms (203) is twice that of the first part of the radiation arm (201), and is disposed on the recessed radiation unit (200). The end of the first part of the radiation arm (201) is connected to the end of the adjacent second part of the radiation arm (202) through the inverted U-shaped loading arms (203). The antenna includes: The antenna housing (1) is fixedly connected to two main mounting seats (2). The lower main mounting seat (2) is rotatably connected to a rear mounting seat (3). The rear mounting seat (3) is connected to a rear fixing seat (4) by bolts. The support arm (5) is provided on the upper side of the main mounting base (2). The support arm (5) is rotatably connected to the swing arm (6). The swing arm (6) is rotatably connected to the pre-mounting base (7). The pre-mounting base (7) is connected to the pre-fixing base (8) by bolts. The movable block (9) is slidably connected to the swing arm (6), the swing arm (6) is rotatably connected to the adjusting member (10), the adjusting member (10) is threadedly connected to the movable block (9), the support arm (5) is rotatably connected to the connecting member (11), and the connecting member (11) is hinged to the movable block (9). Also includes: Two supporting arc blocks (12), the supporting arm (5) is provided with a mounting groove (501) at the position where it contacts the adjacent main mounting base (2), and the supporting arc block (12) is fixed to the side of the supporting arm (5) near the mounting groove (501); The support plate (13) is rotatably connected in the mounting groove (501), the support plate (13) is slidably connected to the support arc block (12), and the support plate (13) is fixedly connected to an elastic plate (14) that is fixedly connected to the support arm (5). Also includes: A limiting piece (15) is fixed to the side of the support arm (5) near the support piece (13). The support piece (13) is provided with a limiting groove (151). The limiting piece (15) limits the support piece (13) through the limiting groove (151).

2. An antenna according to claim 1, characterized in that, The connector (11) is triangular in shape and is used to increase the stability between the support arm (5) and the adjacent swing arm (6).

3. An antenna according to claim 1, characterized in that, The rear mounting base (3), the rear fixing base (4), the pre-mounting base (7) and the pre-fixing base (8) are each provided with a plurality of folding parts (16), and there are gaps between adjacent folding parts (16).

4. An antenna according to claim 3, characterized in that, it further... include: Four extrusion arc blocks (18) are slidably connected to the rear mounting base (3), the rear fixing base (4), the pre-mounting base (7) and the pre-fixing base (8), respectively. Each extrusion arc block (18) is provided with an extrusion part (181), which is used to limit the deformation direction of the adjacent folding part (16). The extrusion arc block (18) is fixedly connected to a plurality of connecting pieces (17). The rear mounting base (3), the rear fixing base (4), the pre-mounting base (7) and the pre-fixing base (8) are respectively fixedly connected to the adjacent connecting pieces (17).

5. An antenna according to claim 4, characterized in that, it further... include: Both plug-in plates (19) are fixedly connected to the pre-fixed base (8); Two pre-installed pieces (20) are respectively fixed to the adjacent connecting pieces (17) in the pre-installation base (7). The plug plate (19) is provided with a plurality of pre-installed slots (191) on the side near the adjacent connecting piece (17). The pre-installed piece (20) limits the adjacent plug plate (19) in one direction through the adjacent pre-installed slots (191).

6. An antenna according to claim 5, characterized in that, The length of the plug plate (19) in the vertical direction is equal to the length of the inner side of the pre-installation seat (7) in the vertical direction. The plug plate (19) is used to limit the position of the pre-installation seat (7).

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