Concave type radiation unit and antenna

Abstract

The invention discloses a recessed radiation unit and an antenna, and relates to the field of mobile communication antennas. The invention aims to solve the problems that the mutual coupling between different frequency bands is easily increased and other key radiation indexes are deteriorated in the existing mode of solving the mutual coupling problem when the array spacing is reduced by increasing the size of a radiation unit or adopting a complex external structure. Comprising a low-frequency radiation unit, the low-frequency radiation unit is internally provided with a recessed radiation unit, the recessed radiation unit comprises four first radiation arm parts and four second radiation arm parts, the first radiation arm parts and the second radiation arm parts are of L-shaped structures, and the first radiation arm parts and the second radiation arm parts belong to different planes. According to the invention, the radiation arms of the recessed radiation unit are recessed inwards along the polarization direction, so that the aperture of the radiation unit is reduced, and mutual coupling between arrays and polarization of the multi-frequency array is effectively reduced.

Description

Technical Field

[0001] The present invention relates to the field of mobile communication antennas, and in particular to a recessed radiation unit and an antenna. Background Art

[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, it is usually necessary to integrate multiple arrays on the same antenna, while ensuring that the antenna cross-section is as small as possible to accommodate the limited frontal area. This requirement makes the internal structure of the antenna more compact, forcing the spacing between arrays to decrease, resulting in severe mutual coupling, which not only affects the antenna's radiation performance 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 adopting complex external loading structures. However, this approach can easily lead to increased mutual coupling between different frequency bands and may deteriorate other key radiation indicators, such as beam directivity and cross-polarization ratio, ultimately causing a decrease in the overall radiation efficiency of the antenna. Summary of the Invention

[0004] In order to overcome the shortcomings of the existing method of increasing the size of the radiating element or adopting a complex external structure 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, the present invention provides a recessed radiating element and antenna.

[0005] The technical implementation scheme of the present invention is: a recessed radiation unit, including: a low-frequency radiation unit, a recessed radiation unit installed in the low-frequency radiation unit, the recessed radiation unit including four radiation arm parts and four radiation arm parts, the radiation arm parts and the radiation arm parts are both L-shaped structures, and the radiation arm parts and the radiation arm parts belong to different planes.

[0006] Furthermore, it also includes: an inverted U-shaped loading arm whose number is twice that of the first radiation arm, which is arranged on the recessed radiation unit, and the end of the first radiation arm is connected to the end of the adjacent second radiation arm through the inverted U-shaped loading arm.

[0007] An antenna, using one of the above-mentioned recessed radiating units, the antenna includes: an antenna shell, the antenna shell is fixedly connected to two main mounting seats, the main mounting seat on the lower side is rotatably connected to the rear mounting seat, and the rear mounting seat is connected to the rear fixing seat by bolts; a support arm, arranged on the main mounting seat on the upper side, the support arm is rotatably connected to the swing arm, the swing arm is rotatably connected to the pre-mounting seat, and the pre-mounting seat is connected to the pre-fixing seat by bolts; a moving block, limitedly slidably connected to the swing arm, the swing arm is rotatably connected to an adjusting member, the adjusting member is threadedly connected to the moving block, the support arm is rotatably connected to a connecting member, and the connecting member is hinged to the moving block.

[0008] Furthermore, the connecting member is triangular in shape as a whole, so as to increase the stability between the supporting arm and the adjacent swing arm.

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

[0010] Furthermore, it also includes: a limiting plate, which is fixed to a side of the support arm close to the support plate, and the support plate is provided with a limiting groove, and the limiting plate limits the support plate through the limiting groove.

[0011] Furthermore, the rear mounting seat, the rear fixing seat, the pre-mounting seat and the pre-fixing seat are all provided with a plurality of folding portions, and gaps exist between adjacent folding portions.

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

[0013] Furthermore, it also includes: two plug-in boards, both fixed in the pre-fixed seat; two pre-installed pieces, respectively fixed on the adjacent connecting pieces in the pre-installed seat, and a plurality of pre-installed grooves are provided on one side of the plug-in board close to the adjacent connecting piece, and the pre-installed piece performs one-way limiting on the adjacent plug-in board through the adjacent pre-installed grooves.

[0014] Furthermore, the length of the plug-in 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-in plate is used to limit the pre-installation seat.

[0015] The beneficial effects of the above technical solution are as follows: the present invention reduces the aperture of the radiation unit by recessing the radiation arm of the inward radiation unit in the polarization direction, thereby effectively reducing the mutual coupling between arrays and polarizations of the multi-frequency array; the threaded transmission connector is moved to change the size of the angle between the swing arm and the support arm. This method not only simplifies the steps of adjusting the antenna tilt angle, but also ensures the stability of the subsequent antenna during use; the support arm, swing arm and connector are overall triangular in structure, and the connector is overall triangular. In this way, during the use of the antenna, the support arm, swing arm and connector can cooperate to effectively disperse and balance external forces, so that the antenna can withstand a greater load; the extrusion arc block is used to guide the end of the folded part to remain in contact with the tower base pole. In this way, it can not only adapt to tower base poles of different diameters, but also increase the extrusion area of ​​the folded part on the tower base pole, increase the force-bearing area between the antenna and the tower base pole, and thus ensure the stability of the antenna during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the three-dimensional structure of the antenna housing and the recessed radiation unit of the present invention; Figure 3 Schematic diagram of the three-dimensional structure of the low-frequency radiation unit and the recessed radiation unit of the present invention; Figure 4 Schematic diagram of the three-dimensional structure of the recessed radiation unit and the inverted U-shaped loading arm of the present invention; Figure 5 It is a schematic diagram of the three-dimensional structure of the radiation arm part one and the radiation arm part two of the present invention; Figure 6 It is a schematic diagram of the three-dimensional structure of the main mounting seat, the rear mounting seat and the rear fixing seat of the present invention; Figure 7 This is a schematic diagram of the three-dimensional structure of the main mounting seat, the rear mounting seat and the folding portion of the present invention; Figure 8 Schematic diagram of the three-dimensional structure of the support arm, swing arm and pre-installation seat of the present invention; Figure 9 It is a schematic diagram of the three-dimensional structure of the moving block, the adjusting member and the connecting member of the present invention; Figure 10 An exploded view of the support arm, swing arm and pre-installation seat of the present invention; Figure 11 Schematic diagram of the three-dimensional structure of the support arm, support arc block and support sheet of the present invention; Figure 12 Schematic diagram of the three-dimensional structure of the support sheet, elastic sheet and limiting sheet of the present invention; Figure 13 It is a schematic diagram of the three-dimensional structure of the folding portion, the connecting piece and the extruded arc block of the present invention; Figure 14 It is a three-dimensional structural cross-sectional view of the pre-installation seat, pre-fixation seat and plug-in board of the present invention.

[0017] In the above drawings: 100-low-frequency radiation unit, 200-recessed radiation unit, 201-radiation arm part 1, 202-radiation arm part 2, 203-inverted U-shaped loading arm, 1-antenna shell, 2-main mounting seat, 3-rear mounting seat, 4-rear fixing seat, 5-support arm, 501-mounting slot, 6-swing arm, 7-pre-mounting seat, 8-pre-fixed seat, 9-moving block, 10-adjusting part, 11-connecting part, 12-support arc block, 13-support plate, 14-elastic plate, 15-limiting plate, 151-limiting slot, 16-folding part, 17-connecting plate, 18-extruded arc block, 181-extruded part, 19-plug-in board, 191-pre-installed slot, 20-pre-installed plate. DETAILED DESCRIPTION

[0018] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description and the drawings.

[0019] See also Figure 1-Figure 5 , is an embodiment of the present invention, and proposes a recessed radiation unit, including: a low-frequency radiation unit 100, in which a recessed radiation unit 200 is installed, the recessed radiation unit 200 includes four radiation arm parts 201 and four radiation arm parts 202, the radiation arm parts 201 and the radiation arm parts 202 are both L-shaped structures, and the radiation arm parts 201 and the radiation arm parts 202 belong to different planes; it also includes: an inverted U-shaped loading arm 203, the number of which is twice that of the radiation arm parts 201, which is arranged on the recessed radiation unit 200, and the end of the radiation arm part 201 is connected to the end of the adjacent radiation arm part 202 through the inverted U-shaped loading arm 203.

[0020] The above scheme aims to solve the problem of mutual coupling that occurs when the array spacing is reduced by increasing the size of the radiation unit or adopting a complex external structure. This method easily leads to increased mutual coupling between different frequency bands and deterioration of other key radiation indicators. In this scheme, the radiation arm of the recessed radiation unit 200 is recessed inward along the polarization direction to reduce the diameter of the radiation unit, effectively reducing the mutual coupling between arrays and between polarizations of the multi-frequency array. The inverted U-shaped loading arm 203 is provided on both sides of the radiation arm of the recessed radiation unit 200 along the polarization direction, which can expand the current path to achieve broadband. band, and at the same time, an inverted U-shaped loading arm 203 is arranged upward at the end of the radiation arm to make the current more concentrated, so as to achieve a more convergent beam width and lower cross-polarization effect; the radiation arm composed of the first radiation arm 201 and the second radiation arm 202 is recessed inwardly along the polarization direction as a whole, reducing the diameter of the recessed radiation unit 200, so that the antenna using the recessed radiation unit 200 has smaller mutual coupling, better radiation indicators, and especially higher radiation efficiency; 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 working frequency band of the recessed radiation unit 200.

[0021] See also Figures 6-10 , is an embodiment of the present invention, an antenna is proposed, which uses the above-mentioned recessed radiation unit, and the antenna includes: an antenna shell 1, the antenna shell 1 is fixedly connected to two main mounting seats 2, the main mounting seat 2 on the lower side is rotatably connected to the rear mounting seat 3, and the rear mounting seat 3 is connected to the rear fixing seat 4 by bolts; a support arm 5, which is arranged on the main mounting seat 2 on the upper side, the support arm 5 is rotatably connected to the swing arm 6, the swing arm 6 is rotatably connected to the pre-mounting seat 7, and the pre-mounting seat 7 is connected to the pre-fixing seat 8 by bolts; a moving block 9, which is limitedly 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 moving block 9, the support arm 5 is rotatably connected to the connecting member 11, and the connecting member 11 is hinged to the moving block 9; the connecting member 11 is triangular as a whole, and is used to increase the stability between the support arm 5 and the adjacent swing arm 6.

[0022] In order to optimize the signal coverage of the base station antenna and reduce co-channel interference, the antenna's tilt angle needs to be precisely adjusted during installation. Currently, there are two main antenna tilt adjustment structures. The first structure consists of two mutually hinged connecting rods and a connecting rod. The two connecting rods are connected to the antenna and the tower base pole respectively. The tilt angle of the antenna is controlled by adjusting the angle between the two connecting rods. After the adjustment is completed, the connecting rod is used to fix the two connecting rods together to lock the antenna's tilt angle. However, since the optimal antenna tilt angle may need to be adjusted multiple times according to actual conditions, this requires the operator to repeatedly disassemble and assemble the connecting rod to change the optimal antenna tilt angle. The angle between the connecting rods, this process seems more cumbersome; the second structure uses two mutually hinged connecting plates and a bolt; one of the connecting plates is provided with an arc-shaped slide groove, and the bolt on the other connecting plate can move in the slide groove. When the angle of the two connecting plates is adjusted to the required position, tighten the bolt and use the friction between it and the slide groove to lock the angle; although this method simplifies the tilt adjustment process, the method of relying on the friction between parts to maintain the stability of the tilt angle has certain limitations, because external factors such as wind force may cause the tilt angle to change, which in turn affects the working performance of the antenna.

[0023] The above scheme aims to solve the problem that the two existing structures for adjusting the antenna tilt angle have limitations in actual use; in this scheme, the threaded transmission connection 11 is rotated to change the size of the angle between the swing arm 6 and the support arm 5. This method not only simplifies the steps of adjusting the antenna tilt angle, but also ensures the stability of the subsequent antenna during use; the lower main mounting seat 2 and the rear mounting seat 3, the support arm 5 and the upper main mounting seat 2, the support arm 5 and the swing arm 6, and the swing arm 6 and the pre-mounting seat 7 are all connected by bolts. After the final antenna tilt angle adjustment is completed, the bolts between the main mounting seat 2 and the rear mounting seat 3, the support arm 5 and the main mounting seat 2, the support arm 5 and the swing arm 6, and the swing arm 6 and the pre-mounting seat 7 are tightened to make the main mounting seat 2 The pre-tightening force provided by the bolts forms a fixed connection state between the rear mounting seat 3, the support arm 5 and the main mounting seat 2, the support arm 5 and the swing arm 6, and the swing arm 6 and the pre-mounting seat 7, thereby increasing the stability of the antenna during use; a nut can be threaded on the adjustment member 10, and after the final inclination angle of the antenna is determined, the nut is rotated to a state of squeezing with the moving block 9, locking the relative position between the moving block 9 and the adjustment member 10, further increasing the stability of the antenna during use; the support arm 5, the swing arm 6 and the connecting member 11 are triangular in structure as a whole, and the connecting member 11 is triangular in shape as a whole, so that during the use of the antenna, the support arm 5, the swing arm 6 and the connecting member 11 can cooperate to effectively disperse and balance external forces, so that the antenna can withstand a larger load.

[0024] See also Figure 10-12, also includes: two support arc blocks 12, a mounting groove 501 is provided at the position where the support arm 5 contacts the adjacent main mounting seat 2, the support arc block 12 is fixedly connected to the side of the support arm 5 close to the mounting groove 501; a support piece 13, rotatably connected in the mounting groove 501, the support piece 13 is slidingly connected to the support arc block 12, and the support piece 13 is fixedly connected to an elastic piece 14 fixed to the support arm 5; also includes: a limiting piece 15, fixedly connected to the side of the support arm 5 close to the support piece 13, the support piece 13 is provided with a limiting groove 151, and the limiting piece 15 limits the support piece 13 through the limiting groove 151.

[0025] When installing a tower-based antenna, due to the limited standing space for the installer on the tower base, the antenna can only be installed by a single person. Furthermore, the existing antenna and antenna bracket (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 integrated into one unit. When installing the antenna, the clamp of the antenna bracket must first be temporarily placed against the tower base pole, and then the antenna is swung horizontally to adjust its orientation. Once the antenna is oriented toward a desired position, the clamp of the antenna bracket can be fixed to the tower base pole. Due to the large size and weight of the antenna, adjusting the antenna's orientation is difficult for the installer. In this solution, the antenna tilt adjustment structure (i.e., the support arm 5, swing arm 6, pre-installation seat 7, and pre-fixing seat 8) is installed separately from the antenna. The orientation of the antenna tilt adjustment structure (i.e., the orientation of the antenna after installation) is first adjusted, and then the antenna and the antenna tilt adjustment structure are integrated into one unit via the mounting slot 501. This facilitates installation and adjustment of the antenna's orientation.

[0026] See also Figure 13 A plurality of folding portions 16 are provided on the rear mounting seat 3 , the rear fixing seat 4 , the pre-mounting seat 7 and the pre-fixing seat 8 , and there are gaps between adjacent folding portions 16 .

[0027] In the above scheme, the folding portion 16 is intended to enable the rear mounting seat 3, the rear fixing seat 4, the pre-mounting seat 7 and the pre-mounting seat 8 to adapt to tower base poles of different diameters; the gaps between adjacent folding portions 16 can cause the surface of the tower base pole to be slightly deformed during the process of fixing the rear mounting seat 3, the rear fixing seat 4, the pre-mounting seat 7 and the pre-mounting seat 8 to the tower base pole (similar to the existing arrangement of teeth at the positions where the rear mounting seat 3, the rear fixing seat 4, the pre-mounting seat 7 and the pre-mounting seat 8 contact the tower base pole), so that the folding portion 16 is "embedded" in the tower base pole, thereby enabling the rear mounting seat 3, the rear fixing seat 4, the pre-mounting seat 7 and the pre-mounting seat 8 to withstand greater circumferential forces without deflection.

[0028] See also Figure 13 and Figure 14, and also includes: four extrusion arc blocks 18, which are respectively slidably connected to the rear mounting seat 3, the rear fixing seat 4, the pre-mounting seat 7 and the pre-fixing seat 8, and the extrusion arc block 18 is provided with an extrusion portion 181, which is used to limit the deformation direction of the adjacent folding portion 16. The extrusion arc block 18 is fixed with multiple connecting pieces 17, and the rear mounting seat 3, the rear fixing seat 4, the pre-mounting seat 7 and the pre-fixing seat 8 are respectively fixed with adjacent connecting pieces 17.

[0029] In the above scheme, it is intended to solve the problem that after the folding portion 16 is bent to adapt to tower base poles of different diameters, the end of the folding portion 16 will deviate in the direction away from the tower base pole, resulting in a reduction in the contact area between the folding portion 16 and the tower base pole, resulting in low antenna stability; this scheme uses the extrusion arc block 18 to guide the end of the folding portion 16 to remain in contact with the tower base pole, thereby increasing the contact area between the folding portion 16 and the tower base pole; the end of the folding portion 16 is provided with an inclined surface on the side away from the tower base pole, and the inclined surface is initially in contact with the extrusion portion 181, and then When the folding portion 16 is bent, the inclined surface of the folding portion 16 moves along the extrusion portion 181, so that the force of the folding portion 16 to squeeze the tower base pole gradually increases until the extrusion force exceeds the elastic force of the connecting piece 17 and the resistance to plastic deformation. The folding portion 16 squeezes and drives the extrusion arc block 18 to move, and the extrusion arc block 18 squeezes the connecting piece 17 and bends it. This not only can adapt to tower base poles of different diameters, but also increases the extrusion area of ​​the folding portion 16 on the tower base pole, increases the force-bearing area between the antenna and the tower base pole, and thus ensures the stability of the antenna during use.

[0030] See also Figure 13 and Figure 14 , also includes: two plug-in boards 19, both of which are fixedly connected to the pre-fixed seat 8; two pre-installed pieces 20, respectively fixedly connected to the adjacent connecting pieces 17 in the pre-installed seat 7, and a plurality of pre-installed grooves 191 are provided on the side of the plug-in board 19 close to the adjacent connecting piece 17. The pre-installed piece 20 limits the adjacent plug-in boards 19 in one direction through the adjacent pre-installed grooves 191; the length of the plug-in board 19 in the vertical direction is equal to the length of the inner side of the pre-installed seat 7 in the vertical direction, and the plug-in board 19 is used to limit the pre-installed seat 7.

[0031] The above scheme aims to solve the following problems: when the existing pre-installation seat 7 and the pre-fixing seat 8 are connected by bolts, since the holes for the bolts to pass through on the pre-installation seat 7 and the pre-fixing seat 8 are larger than the diameter of the bolts, the pre-installation seat 7 and the pre-fixing seat 8 will not be at the same level during installation, resulting in the problem that the pre-installation seat 7 and the pre-fixing seat 8 are prone to falling off when the subsequent antenna is subjected to vibration; when the antenna tilt adjustment structure is pre-installed on the tower base holding pole and the direction is adjusted, multiple adjustments are required, which requires the installation workers on the tower base to repeatedly loosen and tighten the bolts on the pre-installation seat 7 and the pre-fixing seat 8, resulting in cumbersome overall adjustment steps; this scheme embeds the plug plate 19 into the pre-installation seat 7, and uses the upper and lower sides of the plug plate 19 to contact the inner side of the pre-installation seat 7, so that the pre-fixing seat 8 and the pre-installed seat 7 are located in the same plane, and the pre-installed piece 20 and the plug-in plate 19 are used to temporarily fix the pre-fixed seat 8 and the pre-installed seat 7 to achieve quick fixation and quick loosening adjustment (to loosen, just move the two plug-in plates 19 in the direction away from each other). After the adjustment is completed, the pre-installed seat 7 and the pre-fixed seat 8 are fixed to the tower base holding pole with bolts; the plug-in plate 19 and the pre-installed piece 20 are both made of elastic material, and the upper and lower parts of the plug-in plate 19 away from the pre-fixed seat 8 can be provided with inclined surfaces to guide the plug-in plate 19 to be inserted into the pre-installed seat 7; the plug-in plate 19 and the pre-installed piece 20 can also be provided on the rear mounting seat 3 and the rear fixing seat 4, so that the rear mounting seat 3 and the rear fixing seat 4 can be located in the same plane after installation, thereby increasing the stability of the rear mounting seat 3 and the rear fixing seat 4 after installation.

[0032] Finally, it should be noted that the above embodiments are merely examples for the purpose of clarifying this application and are not intended to limit the embodiments. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to provide an exhaustive list of all embodiments. Obvious variations or modifications arising therefrom remain within the scope of protection of this application.

Claims

1. A recessed radiation unit, characterized in that: include: A low-frequency radiation unit (100), wherein a recessed radiation unit (200) is installed in the low-frequency radiation unit (100), wherein the recessed radiation unit (200) comprises four radiation arm portions (201) and four radiation arm portions (202), wherein the radiation arm portions (201) and the radiation arm portions (202) are both L-shaped structures, and the radiation arm portions (201) and the radiation arm portions (202) belong to different planes; Also includes: The inverted U-shaped loading arms (203) are twice as many as the first radiation arm (201) and are arranged on the indented radiation unit (200). The end of the first radiation arm (201) and the end of the adjacent second radiation arm (202) are connected via the inverted U-shaped loading arms (203).

2. An antenna, characterized in that: The antenna uses the recessed radiation unit described in claim 1, and includes: The antenna housing (1) is fixedly connected to two main mounting seats (2), the main mounting seat (2) on the lower side is rotatably connected to a rear mounting seat (3), and the rear mounting seat (3) is connected to a rear fixing seat (4) via bolts; A support arm (5) is arranged on the upper side of the main mounting seat (2), the support arm (5) is rotatably connected to a swing arm (6), the swing arm (6) is rotatably connected to a pre-mounting seat (7), and the pre-mounting seat (7) is connected to a pre-fixing seat (8) via bolts; The moving block (9) is slidably connected to the swing arm (6), the swing arm (6) is rotatably connected to an adjusting member (10), the adjusting member (10) is threadedly connected to the moving block (9), the support arm (5) is rotatably connected to a connecting member (11), and the connecting member (11) is hinged to the moving block (9).

3. The antenna according to claim 2, wherein: The connecting member (11) is triangular in shape as a whole and is used to increase the stability between the support arm (5) and the adjacent swing arm (6).

4. The antenna according to claim 3, further comprising: include: Two supporting arc blocks (12), a mounting groove (501) being provided at a position where the supporting arm (5) contacts the adjacent main mounting seat (2), and the supporting arc block (12) being fixed to a side of the supporting arm (5) close to the mounting groove (501); The support piece (13) is rotatably connected in the mounting groove (501), the support piece (13) is slidably connected to the support arc block (12), and the support piece (13) is fixedly connected to an elastic piece (14) fixedly connected to the support arm (5).

5. The antenna according to claim 4, further comprising: include: A limiting piece (15) is fixedly connected to a side of the support arm (5) close to the support piece (13); the support piece (13) is provided with a limiting groove (151); and the limiting piece (15) limits the support piece (13) through the limiting groove (151).

6. The antenna according to claim 5, wherein: The rear mounting seat (3), the rear fixing seat (4), the pre-mounting seat (7) and the pre-fixing seat (8) are all provided with a plurality of folding portions (16), and gaps exist between adjacent folding portions (16).

7. The antenna according to claim 6, further comprising: include: Four extrusion arc blocks (18) are respectively slidably connected to the rear mounting seat (3), the rear fixing seat (4), the pre-mounting seat (7) and the pre-fixing seat (8); an extrusion portion (181) is provided on the extrusion arc block (18); the extrusion portion (181) is used to limit the deformation direction of the adjacent folding portion (16); the extrusion arc block (18) is fixed with a plurality of connecting pieces (17); the rear mounting seat (3), the rear fixing seat (4), the pre-mounting seat (7) and the pre-fixing seat (8) are respectively fixed with adjacent connecting pieces (17).

8. The antenna according to claim 7, further comprising: include: Two plug-in boards (19) are both fixedly connected in the pre-fixed seat (8); Two pre-installed pieces (20) are respectively fixed to the adjacent connecting pieces (17) in the pre-installed seat (7); a plurality of pre-installed grooves (191) are provided on one side of the plug-in board (19) close to the adjacent connecting piece (17); the pre-installed piece (20) performs one-way positioning of the adjacent plug-in board (19) through the adjacent pre-installed grooves (191).

9. The antenna according to claim 8, wherein: The length of the plug-in 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, and the plug-in plate (19) is used to limit the pre-installation seat (7).

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