Base station antenna

Abstract

The invention relates to the technical field of antennas, in particular to a base station antenna. Comprising a radiation unit, the radiation unit comprises a radiation body, a supporting piece and two feed pieces, the radiation body is provided with a balun cavity, the supporting piece is arranged in the balun cavity, the bottom of the radiation body is provided with a first connecting hole and a second connecting hole, the first end of each feed piece is in coupling connection with the radiation body, the second end of each feed piece is provided with a welding part, and the welding parts penetrate out of the second connecting holes; the reflecting plate is provided with a first through hole and a second through hole, and the first through hole is configured to allow the feed sheet to pass through; the phase shifter comprises a phase shifter cavity and a phase shifting network arranged in the phase shifter cavity, a third through hole and an avoiding hole are formed in the phase shifter cavity, and the conductive connecting piece sequentially penetrates through the first connecting hole, the second through hole and the third through hole; and the welding part sequentially passes through the bottom of the radiator, the first through hole and the avoiding hole and then is electrically connected with the phase shift network. Various functions of the antenna can be realized in a limited space, and deployment in a limited space environment such as a base station is facilitated.

Description

Technical Field

[0001] This application relates to the field of antenna technology, and more particularly to a base station antenna. Background Technology

[0002] The design of base station antennas increasingly needs to consider carbon emissions and energy loss in production and application. Green and low-carbon development has become a key focus of base station antenna technology development and a crucial issue for both manufacturers and operators. Therefore, research is needed in multiple areas, including antenna design, production, and application evaluation, to guide green technology innovation, accelerate the pace of carbon emission reduction in the base station antenna industry, and maintain the global market competitiveness of my country's base station antenna products.

[0003] The radiating element is the core component of a base station antenna. Most base station antennas are now electrically tunable antennas. The radiating element, together with the electrically tunable phase-shifting network or power divider feed network, constitutes the main source of internal antenna loss. In order to reduce the overall loss of the base station antenna and improve its efficiency, a lot of modifications have been made to the feed network, resulting in a large number of low-cable and wireless technologies. However, how the radiating element is connected to the feed network is an important research point in the low-cable and wireless technologies of the radiating element.

[0004] Related technologies include solutions that use relay components and fasteners to connect the phase-shifting network and the radiator. However, the metal relay components and numerous fasteners result in complex installation structures, low assembly efficiency, and significant intermodulation risks. Another solution integrates the balun and phase shifter cavity into a single unit, but this is difficult to manufacture and costly. Yet another solution uses a PCB substrate for the phase-shifting network that extends out of the phase shifter cavity and is inserted into the PCB radiating unit base plate. This solution uses numerous solder joints on the PCB radiating unit, resulting in complex assembly processes. Furthermore, the planar structure of the PCB radiating unit restricts current distribution, limiting its bandwidth performance. Therefore, there is an urgent need for an antenna with a simple assembly structure, minimal cabling, and that does not compromise intermodulation characteristics. Summary of the Invention

[0005] In order to solve the above-mentioned technical problems, or at least partially solve the above-mentioned technical problems, this application provides a base station antenna.

[0006] This application provides a base station antenna, including:

[0007] A radiating unit includes a radiator, a support member, and two feed plates. The radiator has a balun cavity. The support member is disposed within the balun cavity and is snapped into the radiator. The two feed plates are crosswise disposed within the support member. The bottom of the radiator is provided with a first connecting hole and a second connecting hole. The first connecting hole is used to fix the radiator. A first end of each feed plate is coupled to the radiator. A second end of each feed plate is provided with a welding part, which protrudes from the second connecting hole.

[0008] The reflector has a first through hole and a second through hole. The first through hole is configured to allow the feed plate to pass through, and the second through hole is correspondingly provided to the first connecting hole.

[0009] A phase shifter is disposed on both sides of the reflector along its thickness direction, separate from the radiating unit. The phase shifter includes a phase shifter cavity and a phase shifting network disposed within the phase shifter cavity. The phase shifter cavity has a third through hole and a clearance hole. The third through hole corresponds to the second through hole and the first connecting hole. A conductive connector passes through the first connecting hole, the second through hole, and the third through hole in sequence to electrically connect the radiator and the phase shifter cavity. The clearance hole corresponds to the first through hole. The welding part passes through the bottom of the radiator, the first through hole, and the clearance hole in sequence and is electrically connected to the phase shifting network.

[0010] Optionally, the radiator includes a base, balun arms, and a radiating wall. The number of balun arms is four, and the four balun arms are arranged in pairs opposite each other along the circumference of the base. The balun arms and the base together enclose the balun cavity. The end of the balun cavity away from the base is open, and a balun slit is formed between adjacent balun arms. The radiating wall is located at the end of the balun arm away from the base.

[0011] Optionally, the radiator is a sheet metal part that is bent as a single piece.

[0012] Optionally, the support member includes a support plate, four support arms and four limiting arms, the four support arms and the four limiting arms being staggered along the circumference of the support plate and all connected to the lower surface of the support plate.

[0013] The support arm and the balun arm are arranged in a one-to-one correspondence, and the support plate is provided with a first buckle at the position corresponding to the support arm. The support arm is provided with a first abutting part, and the balun arm is provided with a first snap-fit ​​hole at the corresponding position. The first buckle is snapped into the first snap-fit ​​hole, and the first abutting part abuts against the inner wall of the balun arm.

[0014] The limiting arms are embedded in the balun seam one by one, and the lower end of the limiting arm protrudes to both sides along the width direction to form two limiting protrusions. The two limiting protrusions abut against the outer wall of the balun arm on both sides of the balun seam.

[0015] Optionally, the lower end of the support arm is provided with a second abutment on the outer side opposite to the balun arm. The second abutment abuts against the inner wall of the balun arm, and the second abutment is provided with a first through hole. The support plate is provided with a second through hole at the corresponding position, and the power supply plate passes through the first through hole and the second through hole.

[0016] Optionally, the support plate is annular in shape, and the support arm is connected to the inner side of the support plate, while the limiting arm is connected to the outer side of the support plate; the upper end of the support arm is provided with an avoidance notch, the power feed piece is locked in the avoidance notch, and the inner side of the support arm is provided with a second buckle, and the two second buckles on the inner sides of the two opposing support arms respectively abut against the upper surfaces of the corresponding power feed pieces on both sides in the width direction.

[0017] Optionally, an isolation cover is provided at the lower end of the support arm that cooperates with the welding part. The isolation cover is coaxially arranged with the first through hole, and the isolation cover is inserted into the second connecting hole to isolate the welding part passing through the isolation cover from the radiator.

[0018] Optionally, the feed plate includes a first connecting segment, a second connecting segment, and a third connecting segment arranged sequentially along the length direction. The first connecting segment is coupled to the radiator, the third connecting segment is disposed opposite to the first connecting segment, the second connecting segment is connected between the upper end of the first connecting segment and the upper end of the third connecting segment, the lower end of the first connecting segment forms the first end, and the lower end of the third connecting segment forms the welding part.

[0019] The welded part is cylindrical or sheet-shaped. When the welded part is sheet-shaped, the welded part is twisted 45° relative to the upper part of the third connecting section so that the welded part can be attached and connected to the phase-shifting network.

[0020] Optionally, the base extends radially outward to form a first mounting foot, the first mounting foot having a protruding structure with the bottom surface of the protruding structure protruding downward, and the first connecting hole penetrating the protruding structure.

[0021] Optionally, the number of the first mounting feet is four.

[0022] The four first mounting feet are arranged in the same manner as the balun seam. The inner wall of the side wall of the phase shifter cavity and the bottom of the radiator protrudes inward along the thickness direction to form a second connecting part. The second connecting part is provided with two third through holes. The two first mounting feet arranged opposite to each other are arranged in the same manner as the two third through holes to electrically connect the radiator and the phase shifter cavity. The other two first mounting feet arranged opposite to each other are fixedly connected to the reflector.

[0023] Alternatively, the four first mounting feet are arranged one-to-one with the balun arm, and the side wall of the phase shifter cavity and the bottom of the radiator are arranged to extend outward along the width direction to form a first connecting part. The first mounting feet are arranged corresponding to the first connecting part, and the third through hole is provided on the first connecting part.

[0024] The technical solution provided in this application has the following advantages compared with the prior art:

[0025] The base station antenna provided in this embodiment uses a support member set within the balun cavity and snapped into the radiator. This effectively disperses external forces from different directions, such as wind and vibration, improving the overall stability of the radiating element and ensuring it will not deform or be damaged during use. Simultaneously, the support member provides a stable mounting position for the feed plates, ensuring that the two feed plates maintain the correct cross angle and relative position, thereby ensuring the stability and consistency of signal transmission. The support member facilitates the installation and positioning of the feed plates. During assembly, workers can more easily place the feed plates within the support member and then snap the support member into the radiator, improving assembly efficiency and quality. Furthermore, the base station antenna in this embodiment adopts a cable-free direct-connect architecture. The radiator is electrically connected to the phase-shifting network through a clearance hole, reducing energy loss along the transmission path and improving signal transmission efficiency. The overall structure is compact, with a reasonable layout of the radiating element, reflector, and phase shifter, enabling the antenna to perform all functions within a limited space, which is beneficial for deployment in space-constrained environments such as base stations. Attached Figure Description

[0026] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0027] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1This is a schematic diagram of the base station antenna structure described in an embodiment of this application;

[0029] Figure 2 for Figure 1 A magnified view of part A in the image;

[0030] Figure 3 This is a side view of the base station antenna described in an embodiment of this application;

[0031] Figure 4 This is a schematic diagram of the structure of the radiating unit described in the embodiment of this application;

[0032] Figure 5 This is an exploded view of the radiation unit described in the embodiments of this application;

[0033] Figure 6 This is a schematic diagram of the structure of the radiator described in the embodiments of this application;

[0034] Figure 7 This is a schematic diagram of the bottom structure of the radiator described in the embodiments of this application;

[0035] Figure 8 This is a schematic diagram of the structure of the support member described in the embodiment of this application;

[0036] Figure 9 This is a schematic diagram of the structure of two of the power supply components described in the embodiments of this application;

[0037] Figure 10 This is a schematic diagram of the structure of two power supply components in other embodiments of this application;

[0038] Figure 11 This is a schematic diagram of the base station antenna structure described in other embodiments of this application;

[0039] Figure 12 for Figure 11 A magnified view of part B in the image;

[0040] Figure 13 This is a schematic diagram of the phase shifter cavity described in the embodiments of this application;

[0041] Figure 14 This is a side view of the phase shifter cavity described in the embodiment of this application;

[0042] Figure 15 This is an exploded view of the radiator described in an embodiment of this application from another perspective;

[0043] Figure 16 This is a schematic diagram of the structure of a base station antenna according to other embodiments of this application;

[0044] Figure 17 This is a side view of a base station antenna described in some other embodiments of this application;

[0045] Figure 18 This is a schematic diagram of the structure of the phase shifter cavity described in some other embodiments of this application;

[0046] Figure 19 This is a schematic diagram of the structure of the radiator described in some other embodiments of this application;

[0047] Figure 20 This is a top view of the radiator described in some other embodiments of this application;

[0048] Figure 21 This is a schematic diagram of the base station antenna structure in some embodiments of this application.

[0049] The components include: 1. Radiation unit; 11. Radiator; 12. Support; 13. Feed plate; 1101. First mounting foot; 1102. Protruding structure; 1103. Balun arm; 1104. Radiation wall; 1105. Bending part; 1106. First snap-fit ​​hole; 1107. Base; 1108. Second connecting hole; 1109. First connecting hole; 1110. Balun seam; 1201. Second buckle; 1202. Clearance notch; 1203. Limiting arm; 1204. Limiting protrusion; 1205. Support arm; 1206. Second abutment part; 1207. First abutment part; 1208. Isolation cover; 1209. First through hole; 1210. First buckle; 1211. Second through hole; 131. First connecting section; 132. Second connecting section; 133. Third connecting section; 1331. Welding part.

[0050] 2. Conductive connectors;

[0051] 3. Reflector;

[0052] 4. Phase shifter; 41. Phase shifter cavity; 42. Phase shifting network; 4101. Second connecting part; 4102. Slot; 4103. Third through hole; 4104. Clearance hole; 4105. First connecting part; 4106. Partition plate; 4201. Welding plate. Detailed Implementation

[0053] To better understand the above-mentioned objectives, features, and advantages of this application, the solution of this application will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0054] Many specific details are set forth in the following description in order to provide a full understanding of this application, but this application may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of this application, and not all embodiments.

[0055] Related technologies disclose base station antennas with no or few cables. For example, patent CN116031615A discloses a base station antenna including a radiating element, a reflector, a phase shifter, and a relay component. The radiating element's feed port includes an outer conductor and an inner conductor, with the inner conductor electrically connected to the phase shifter circuit. A metal relay component is used, with one end electrically connected to the outer conductor using fasteners and the other end electrically connected to the cavity using fasteners, thus grounding the cavity and the outer conductor of the radiating element. However, this solution introduces a metal relay component, and the metal relay component is electrically connected to the outer conductor using fasteners. The metal relay component and numerous fasteners result in a complex installation structure, low assembly efficiency, and a significant risk of intermodulation issues.

[0056] Patent CN117293524A discloses a balun structure radiating element phase-shifting cavity assembly and an antenna assembly. Specifically, it discloses an integrated molding of the radiating element balun and the phase-shifting cavity. The integrated balun passes through a reflector, and the radiating component is fixed to the balun on the other side of the reflector via an insulating component. This solution, using an integrated balun and cavity, is difficult to manufacture and therefore costly.

[0057] Patent CN116487888A discloses a low-loss integrated phase shifter and antenna, including a phase shifter metal cavity, a phase shifter network, and a phase shifter medium. Both the phase shifter network and the phase shifter medium are located inside the phase shifter metal cavity. The phase shifter network includes a transmission line and a first PCB substrate. The transmission line is placed on the first PCB substrate. The phase shifter medium includes a dielectric sheet, which comprises a sliding dielectric sheet and a fixed dielectric sheet. The sliding dielectric sheet passes through the phase shifter metal cavity, and the sliding dielectric sheet and the fixed dielectric sheet are respectively fixed to both sides of the first PCB substrate. A feed network is provided at the bottom of the radiating element, and a second PCB substrate is provided on the feed network. The protrusion of the first PCB substrate is inserted into and soldered to the second PCB substrate of the feed network. The second PCB substrate is fixed to the phase shifter metal cavity by riveting. The phase shifter can be placed directly above a reflector plate of the radiating element or staggered on the reflector plate. The radiating elements can form an array, and the array can be of different spacing, thus the antenna can meet the requirements of multi-element antennas with different gains. This scheme uses a PCB board as the radiating unit, which has many solder joints and a complex assembly process. In addition, because the PCB board is a planar structure, it will constrain the distribution of current, resulting in inherent limitations in its bandwidth performance.

[0058] While the antennas disclosed in the aforementioned patents achieve wireless or minimal wiring, they also introduce other problems, such as complex assembly or impact on the antenna's intermodulation characteristics.

[0059] To solve the above technical problems, such as Figures 1 to 21 As shown, this application embodiment provides a base station antenna, including a radiating element 1, a reflector 3, and a phase shifter 4, with the radiating element 1 and the phase shifter 4 respectively disposed on both sides of the reflector 3.

[0060] The radiating unit 1 includes a radiator 11, a support member 12, and two feed plates 13. The radiator 11 has a balun cavity. The support member 12 is disposed in the balun cavity and is snapped into the radiator 11. The two feed plates 13 are arranged crosswise in the support member 12. The bottom of the radiator 11 is provided with a first connecting hole 1109 and a second connecting hole 1108. The first end of the feed plate 13 is coupled to the radiator 11. The second end of the feed plate 13 is provided with a welding part 1331. The welding part 1331 extends out from the second connecting hole 1108. The first connecting hole 1109 is used to fix the radiator 11.

[0061] The reflector 3 is provided with a first through hole and a second through hole. The first through hole is configured to allow the feed plate 13 to pass through, and the second through hole is provided in correspondence with the first connecting hole 1109.

[0062] The phase shifter 4 includes a phase shifter cavity 41 and a phase shifting network 42 disposed within the phase shifter cavity 41. The phase shifter cavity 41 is provided with a third through hole 4103 and a clearance hole 4104. The third through hole 4103 is correspondingly disposed with the second through hole and the first connecting hole 1109. The conductive connector 2 passes through the first connecting hole 1109, the second through hole and the third through hole 4103 in sequence to electrically connect the radiator 11 to the phase shifter cavity 41. The clearance hole 4104 is correspondingly disposed with the first through hole. The welding part 1331 passes through the bottom of the radiator 11, the first through hole and the clearance hole 4104 in sequence and is electrically connected to the phase shifting network 42.

[0063] Specifically, the support member 12 is made of insulating material, and its outer contour matches the inner wall of the balun cavity. The support member 12 has a cross-shaped receiving groove inside for positioning the two feed plates 13. The two feed plates 13 are arranged at a 90° angle and are insulated at the intersection. The first end of the feed plate 13 is located inside the balun cavity and coupled to the radiator 11. The welding part 1331 passes through the second connecting hole 1108 and through the reflector 3 to be welded to the phase shifting network 42, realizing the electrical connection between the welding part 1331 and the phase shifting network 42.

[0064] like Figure 13 and Figure 14As shown, a partition 4106 is provided inside the phase shifter cavity 41, dividing the interior of the phase shifter cavity 41 into two independent chambers. Each chamber is equipped with a phase shifting network 42, which includes a PCB substrate and microstrip lines disposed on the PCB substrate. The PCB substrate is fixed within its respective chamber, and the end of the microstrip line is provided with a solder pad 4201 adapted to the soldering part 1331. The two soldering parts 1331 are respectively soldered to the PCB substrates in the two chambers, thereby achieving electrical connection between the radiator 11, the feed plate 13, and the phase shifting network 42.

[0065] During use, the radiator 11 receives electromagnetic waves from electronic devices such as mobile phones, converts them into electrical signals, and transmits the electrical signals to the first end of the feed plate 13 through coupling. The electrical signals are transmitted along the feed plate 13 and enter the phase shifting network 42 of the phase shifter 4 through the welding part 1331. The phase shifting network 42 performs phase compensation and amplitude adjustment on the signals from different radiating units 1, and then efficiently combines them into one signal. The combined signal is output from the phase shifter 4 and transmitted back to the RRU of the base station via the feeder for further processing.

[0066] After the conductive connector 2 electrically connects the radiator 11 to the phase shifter cavity 41, the radiator 11 and the phase shifter cavity 41 are at the same potential, forming a Laday cage-like shielding structure. This effectively "short-circuits" internal electromagnetic interference (EMI) and external stray signals to ground, preventing them from leaking or entering the signal path, thereby improving the isolation between the antenna channels and ensuring the accuracy of beamforming.

[0067] The conductive connector 2 is not only an electrical conductor but also a mechanical fastener. It firmly anchors the three main components—radiation unit 1, reflector 3, and phase shifter cavity 41—to form a more rigid whole. This is crucial for resisting strong winds, vibrations, and thermal expansion and contraction caused by temperature changes outdoors.

[0068] The conductive connector 2 made of metal and the connecting surface also form a heat conduction channel, which helps to conduct the heat on the phase shifter 4 and the radiator 11 to the larger reflector 3, and then radiate it into the air through the reflector 3, which plays an auxiliary role in heat dissipation and improves the long-term reliability of the equipment.

[0069] The base station antenna provided in this embodiment is mounted inside the balun cavity by a support member 12 and snapped into the radiator 11. This effectively disperses external forces from different directions, such as wind and vibration, improving the overall stability of the radiating element 1 and ensuring that it will not deform or be damaged during use. Simultaneously, the support member 12 provides a stable mounting position for the feed piece 13, ensuring that the two feed pieces 13 maintain the correct cross angle and relative position, thereby ensuring the stability and consistency of signal transmission. The presence of the support member 12 makes the installation and positioning of the feed piece 13 more convenient. During assembly, workers can more easily place the feed piece 13 inside the support member 12 and then snap the support member 12 into the radiator 11, improving assembly efficiency and quality. Furthermore, the base station antenna in this embodiment adopts a cable-free direct-connect architecture. The radiator 11 is electrically connected to the phase-shifting network 42 through a clearance hole 4104, reducing energy loss of the signal on the transmission path and improving signal transmission efficiency. The overall structure is compact, and the layout of the radiating element 1, reflector 3 and phase shifter 4 is reasonable. It can realize the various functions of the antenna in a limited space, which is conducive to deployment in environments with limited space, such as base stations.

[0070] Furthermore, such as Figures 4 to 7 As shown, in some embodiments of this application, the radiator 11 includes a base 1107, balun arms 1103, and a radiation wall 1104. There are four balun arms 1103, which are arranged in pairs opposite each other along the circumference of the base 1107. The balun arms 1103 and the base 1107 together enclose a balun cavity. The end of the balun cavity away from the base 1107 is open. A balun slit 1110 is formed between adjacent balun arms 1103. The radiation wall 1104 is located at the end of the balun arm 1103 away from the base 1107. Two feed plates 13 are respectively arranged corresponding to the two pairs of oppositely arranged balun arms 1103.

[0071] Specifically, four balun arms 1103 are arranged in pairs around the base 1107, forming a balun cavity together with the base 1107, thus creating a typical balun structure. The core function of the balun is to convert between unbalanced and balanced circuits.

[0072] The signal transmitted by the feed plate 13 is usually an unbalanced signal (with the phase shifter cavity 41 as the ground reference), while the radiating wall 1104, as a symmetrical radiating structure, requires balanced excitation.

[0073] The cooperation between the balun arm 1103 and the balun slot 1110 (the gap between adjacent balun arms 1103) suppresses common-mode current, ensuring that the feed energy is radiated into space only through the radiating wall 1104, preventing energy leakage from the base 1107 or the reflector 3, and improving antenna efficiency. The radiating wall 1104 is located at the end of the balun arm 1103 away from the base 1107, forming a radiating structure similar to a "horn". The two feed plates 13 correspond to the two pairs of opposing balun arms 1103, forming an orthogonal polarization feed system. The two pairs of opposing balun arms 1103 correspond to horizontal polarization (H) and vertical polarization (V), respectively. The feed plates 13, through coupling with the balun arms 1103, inject signals into two orthogonal directions, enabling the antenna to simultaneously transmit / receive horizontally and vertically polarized electromagnetic waves.

[0074] The support 12 fixes the feed plate 13 in the balun cavity to ensure that its relative position with the corresponding balun arm 1103 is stable. The phase shifter 4 injects a phase-adjustable signal into the two pairs of balun arms 1103 through the feed plate 13. Combined with the directional characteristics of the radiation wall 1104, the beam pointing in the two polarization directions can be precisely controlled to achieve independent electric adjustment of dual polarization and meet the coverage optimization requirements in complex scenarios.

[0075] In some embodiments of this application, the base 1107 extends radially outward to form a first mounting foot 1101. The first mounting foot 1101 is provided with a protruding structure 1102, the bottom surface of which protrudes downward. A first connecting hole 1109 passes through the protruding structure 1102. The bottom surface of the protruding structure 1102 protrudes downward, forming point contact or partial surface contact with the surface of the reflector 3. The connecting surfaces can be tightly fitted by a pre-tightening force, reducing loosening caused by vibration (such as strong wind or resonance from passing vehicles).

[0076] The height and profile of the protruding structure 1102 can be matched with the peripheral structure of the second through hole of the reflector 3 (such as an annular step) to achieve rapid alignment of the radiating unit 1 and the reflector 3. Compared with planar contact, the protruding structure 1102 can reduce the assembly tilt caused by unevenness (such as slight warping) of the base 1107 or the surface of the reflector 3, ensure the parallel relationship between the radiating wall 1104 and the reflector 3, and maintain the stability of the beam pointing.

[0077] The core design objective of this protrusion structure 1102 is to improve third-order intermodulation (PIM) performance by optimizing contact characteristics, while ensuring connection stability. Its specific function and principle are as follows:

[0078] The generation of third-order intermodulation (PIM) is directly related to device nonlinearity, among which contact nonlinearity is one of the core influencing factors. Parameters such as the roughness, cleanliness, pressure stability, area, and shape of the contact surface directly determine the severity of contact nonlinearity. The protrusion structure 1102 of this application optimizes contact nonlinearity through the following design:

[0079] First, the raised bottom surface of the raised structure 1102 forms a small planar contact or annular surface contact with the surface of the reflector 3. By precisely matching the diameter of the raised structure 1102 with the diameter of the fastener pan head (or adapting the connection surface size), the area and shape of the contact surface are strictly controlled, avoiding the problem of uneven contact state caused by large-area contact. This ensures that the axial pressure line passes precisely through the effective conductor contact surface, so that the contact surface only bears axial pressure without additional bending moment interference, thereby reducing the nonlinear risk from the contact form.

[0080] Secondly, the local contact characteristics of the protruding structure 1102 can improve the stability of contact pressure: on the one hand, the small-area contact under the action of pre-tightening force can form a more concentrated pressure distribution and reduce the contact gap; on the other hand, the local fitting design of the protruding structure 1102 and the reflector 3 can reduce the loosening of the connection caused by strong winds, vehicle resonance and other vibrations, and avoid the axial pressure drop caused by torque decay. The insufficient pressure caused by torque decay will directly deteriorate the contact nonlinearity, thereby causing the PIM index to deteriorate. Therefore, the protruding structure 1102 can further suppress nonlinearity by ensuring the stability of contact pressure.

[0081] In summary, the raised structure 1102 reduces contact nonlinearity at the core influencing factor level by optimizing the area, shape, and contact pressure stability of the contact surface, ultimately improving the third-order intermodulation (PIM) performance of the radiating unit, while also taking into account the vibration resistance and anti-loosening capability of the connection structure, ensuring performance stability during long-term use.

[0082] In some embodiments of this application, the radiator 11 is a sheet metal part that is bent as a single piece.

[0083] Specifically, the bottom of the radiator 11 is a square base 1107. A bent arm extends upwards along the base 1107, forming a balun arm 1103. The four balun arms 1103 and the base 1107 together form a balun cavity. The gaps between adjacent balun cavities form balun seams 1110. The upper ends of the balun arms 1103 bend outwards to form radiating walls 1104. The ends of the radiating walls 1104 bend downwards to form bent portions 1105. The four radiating walls 1104 form the radiating surface of the radiator 11. Figure 6 and Figure 7 As shown, the base 1107 extends outward from the diagonal position to form the first mounting foot 1101. The first mounting foot 1101 has a protruding structure 1102 and a first connecting hole 1109 formed by stamping.

[0084] In this embodiment, the radiator 11 is formed by bending a single sheet metal piece. In the absence of the support member 12, it is difficult to ensure that the dimensions such as the distance between the relatively arranged balun arms 1103, the distance between the ends of the two relatively arranged balun arms 1103 away from the base 1107, and the perpendicularity between the end of the balun arm 1103 away from the base 1107 and the base 1107 are within the required dimensional tolerance range.

[0085] The support member 12 is positioned within the balun cavity and engages with the radiator 11, directly providing a rigid constraint on the balun arm 1103 of the radiator 11, thus limiting its displacement space. This effectively prevents deformation of the balun arm 1103 during processing, assembly, or use, ensuring stable dimensional accuracy. It ensures that all critical dimensions consistently meet design tolerance requirements, thereby guaranteeing the signal transmission efficiency and structural stability of the radiating unit.

[0086] The integral bending structure has no weak points and its torsional strength is higher than that of spliced ​​structures. Under the temperature cycling and vibration impact of outdoor environments, it can effectively suppress the deformation of the balun arm 1103 or the radial wall 1104.

[0087] Sheet metal parts can be electrically connected to the feed plate 13 by coupling, without the need for welding or electroplating, thus reducing costs.

[0088] In 5G high-frequency band applications (such as 26GHz and 28GHz), the dimensional accuracy of the radiator 11 has a significant impact on signal radiation efficiency: the integrated bent sharp edge structure (such as the edge of the balun arm 1103) can reduce the diffraction loss of high-frequency signals and improve radiation efficiency; the absence of splicing gaps avoids the reflection and attenuation of high-frequency signals at the seams, enabling the antenna to maintain good impedance matching in a wide frequency band.

[0089] Furthermore, such as Figure 8 As shown, in some embodiments of this application, the support member 12 includes a support plate, four support arms 1205, and four limiting arms 1203. The four support arms 1205 and four limiting arms 1203 are staggered along the circumference of the support plate and are all connected to the lower surface of the support plate. The support arms 1205 and the baron arms 1103 are arranged one-to-one, and the support plate is provided with a first buckle 1201 at the position corresponding to the support arm 1205. The support arm 1205 is provided with a first abutment portion 1207. The corresponding position of the arm 1103 is provided with a first snap hole 1106, and the first buckle 1210 is correspondingly snapped into the first snap hole 1106. The first abutting part 1207 abuts against the inner wall of the arm 1103. The limiting arms 1203 are correspondingly embedded in the balun seam 1110, and the lower end of the limiting arm 1203 protrudes to both sides along the width direction to form two limiting protrusions 1204. The two limiting protrusions 1204 abut against the outer walls of the arm 1103 on both sides of the balun seam 1110.

[0090] Specifically, the first latch 1210 engages with the first latching hole 1106 of the balun arm 1103, forming a mechanical lock similar to a tenon and mortise, preventing the support member 12 from loosening or falling off along the axial (vertical) direction of the balun cavity. Combined with the supporting plate, it can withstand significant axial tensile force. The first abutting part 1207 abuts tightly against the inner wall of the balun arm 1103, eliminating the radial gap between the support member 12 and the balun cavity, ensuring the stability of the support member 12's central position within the radiator 11, and preventing displacement due to vibration. The limiting arm 1203 is embedded in the balun 1110 and supports the balun 1103 on both sides. The limiting protrusion 1204 at its lower end extends to both sides and abuts against the outer wall of the balun 1103, thereby locking the outer side of the balun 1103 and engaging with the inner side of the first abutment 1207 to achieve mutual fixation with the radiator 11 and maintain the shape of the radiator 11.

[0091] The support member 12 forms a rigid "internal skeleton" inside the radiator 11, which evenly distributes externally applied loads (such as vibration, wind pressure, and assembly stress) across the entire structure, thereby resisting and suppressing the deformation of the radiator 11 and ensuring that it maintains its designed geometry under various operating conditions. This conformal function is the fundamental guarantee for maintaining the long-term stable electrical performance of the antenna.

[0092] The support member 12 forms a rigid frame through the support plate, support arm 1205 and limiting arm 1203, and the cross-shaped receiving groove formed inside it significantly improves the fixing accuracy of the feed plate 13.

[0093] The buckle and abutment of the support 12 and the snap-fit ​​hole and balun 1110 of the radiator 11 form a uniquely matched positioning structure, eliminating the need for complex calibration during assembly: the operator can determine that the installation is in place by the tactile feedback of the buckle entering the hole and the limit arm 1203 entering the seam.

[0094] Furthermore, the first abutment portion 1207 and the limiting protrusion 1204 cooperate with the balun arm 1103 at its upper and lower ends, and the support arms 1205 clamp the balun arm 1103 on both sides of its width direction. For example, the first abutment portion 1207 abuts against the inner wall of the upper end of the balun arm 1103, the limiting protrusion 1204 abuts against the outer wall of the lower end of the balun arm 1103, and the support arms 1205 are respectively provided on both sides of the balun arm 1103 in its width direction to clamp it. Therefore, the formed balun arm 1103 is supported and limited in both its width and thickness directions, further improving the structural stability of the balun arm 1103 and preventing deformation.

[0095] The limiting protrusion 1204 is designed with an arc shape so as to abut against the outer wall of the two balun arms 1103 which are set at 90 degrees.

[0096] In some embodiments of this application, the lower end of the support arm 1205 is provided with a second abutment portion 1206 on the outer side opposite to the balun arm 1103. The second abutment portion 1206 abuts against the inner wall of the balun arm 1103, and a first through hole 1209 is provided on the second abutment portion 1206. A second through hole 1211 is provided at the corresponding position of the support plate, and the power supply plate 13 passes through the first through hole 1209 and the second through hole 1211.

[0097] Specifically, the second abutment portion 1206 is a structure protruding from the outer wall of the support arm 1205. The end of the second abutment portion 1206 away from the support arm 1205 abuts against the inner wall of the balun arm 1103. A first through hole 1209 is formed on the second abutment portion 1206 in the vertical direction. The feed plate 13 needs to pass through the first through hole 1209 of the second abutment portion 1206 at the lower end of the support arm 1205 and the second through hole 1211 of the support plate in sequence to form a two-point positioning, thus preventing the position of the feed plate 13 from shifting.

[0098] The second abutment portion 1206 abuts against the inner wall of the balun arm 1103, forming a two-point support with the first abutment portion 1207 at the upper end of the support arm 1205. This creates uniformly distributed support points along the height (axial) direction of the balun arm 1103, transforming single-point force into multi-point distributed force, resulting in a more uniform distribution of thermal expansion and contraction stress in the balun arm 1103 during temperature changes, and a smaller amount of bending deformation.

[0099] Furthermore, the support plate is ring-shaped, and the support arm 1205 is connected to the inner side of the support plate, the limiting arm 1203 is connected to the outer side of the support plate, the upper end of the support arm 1205 is provided with an avoidance notch 1202, the feed plate 13 is locked in the avoidance notch 1202, the second buckle 1201 on the inner side of the support arm 1205, the two second buckles 1201 on the inner side of the two opposing support arms 1205 respectively abut against the upper surfaces on both sides of the width direction of the corresponding feed plate 13.

[0100] Specifically, such as Figure 9 and Figure 10As shown, the power supply plate 13 includes a first connecting segment 131, a second connecting segment 132, and a third connecting segment 133 arranged sequentially along the length direction. The first connecting segment 131 and the third connecting segment 133 are respectively arranged corresponding to two balun arms 1103 arranged opposite to each other. The two ends of the second connecting segment 132 are respectively connected to the upper ends of the first connecting segment 131 and the upper ends of the third connecting segment 133. The first connecting segment 131 is coupled to one of the balun arms 1103. The length of the support arm 1205 arranged corresponding to the first connecting segment 131 is less than the length of the support arm 1205 arranged corresponding to the third connecting segment 133.

[0101] During the installation of the feed plate 13, both ends of the second connecting segment 132 are respectively placed into the clearance notches 1202 at the upper end of the support arm 1205. The clearance notches 1202 engage with the second connecting segment 132, preventing the second connecting segment 132 from moving along its width or downward. The upper surfaces of both ends of the second connecting segment 132 are pressed together by two second latches 1201. The two second latches 1201 on the support arm 1205, like two "fingers," press down on the upper surface of the feed plate 13 from both sides along its width. The second latches 1201 restrict the upward movement and the movement along its width of the second connecting segment 132.

[0102] The first perforation 1209 and the second perforation 1211 restrict the offset of the first connecting segment 131 along the width and thickness directions. The first perforation 1209, the second perforation 1211, the third perforation on the base 1107 of the radiator 11, and the first through hole on the reflector 3 restrict the offset of the third connecting segment 133 along the width and thickness directions.

[0103] The support plate is designed as a ring, and the hole left in the middle of the ring design can provide space for the bending of the feed plate 13 or other internal structures, making the overall design more compact.

[0104] The above structure improves the stability of the feed plate 13 mounting structure and prevents the feed plate 13 from shifting or deviating after installation or when subjected to external forces, thus affecting the intermodulation characteristics of the antenna.

[0105] Furthermore, such as Figure 15 As shown, in some embodiments of this application, the lower end of the support arm 1205 that cooperates with the welding part 1331 is provided with an isolation cover 1208. The isolation cover 1208 is coaxially arranged with the first through hole 1209, and the isolation cover 1208 is inserted into the second connection hole 1108 to isolate the welding part 1331 from the radiator 11.

[0106] The welding part 1331 (that is, the pin connected to the phase-shifting network 42) needs to pass through the second connection hole 1108 of the radiator 11. If it is directly close to the radiator 11 (especially in the high-frequency band), parasitic capacitance will be formed due to the gap between the metals, causing the feed signal to leak to the radiator 11, resulting in energy loss. Stray currents on the radiator 11 are reverse-coupled to the feed plate 13, introducing interference signals (such as intermodulation products). The isolation cover 1208 (usually made of a low dielectric constant insulating material such as polytetrafluoroethylene) is sleeved on the outside of the feed plate 13 and inserted into the second connection hole 1108 to form a physical isolation barrier, which can reduce parasitic capacitance, suppress signal leakage, and ensure the purity of the feed path.

[0107] Meanwhile, the isolation cover 1208 is coaxial with the first through hole 1209 and inserted into the second connecting hole 1108, forming a dual guiding structure: providing precise path guidance for the welding part 1331 during assembly, ensuring that it is precisely aligned with the avoidance hole 4104 of the phase shifter 4 and the welding pad 4201 of the phase shifting network 42, reducing the risk of pin bending or poor soldering; limiting the radial sway of the feed plate 13 at the through hole, and maintaining a stable coupling distance between it and the balun arm 1103.

[0108] Furthermore, in some embodiments of this application, the welded portion 1331 is cylindrical or sheet-like, such as... Figure 1 , Figure 2 and Figure 9 As shown, when the third connecting segment 133 is cylindrical, since the width and length dimensions of the cross-section of the third connecting segment 133 are close, the welding effect is not much different regardless of which side of the third connecting segment 133 contacts the welding disk 4201 on the phase shifting network 42 for welding.

[0109] like Figures 10 to 12 As shown, when the third connecting section 133 is sheet-like, the width and length of the welding part 1331 differ significantly. The welding part 1331 has two large surfaces and two small surfaces arranged opposite each other. The third connecting sections 133 of the two feed plates 13 are arranged adjacent to each other. At this time, if the direction of the welding part 1331 is not changed, the welding part 1331 will have an angle with the welding disk 4201 of the phase shifting network 42 after it extends into the phase shifter cavity 41. That is to say, the large surface of the welding part 1331 cannot fit with the welding disk 4201 of the phase shifting network 42. In order to improve the stability of the welding structure, the welding part 1331 is twisted by 45° relative to the upper part of the third connecting section 133 so that the welding part 1331 can fit with the welding disk 4201 of the phase shifting network 42. The feed plate 13 itself is a planar structure, and its current distribution is also planar. By twisting its end and directly welding it to the welding pad 4201, a smooth transition of the electromagnetic field pattern can be achieved, minimizing signal reflection and loss at the connection point, thereby ensuring good impedance matching.

[0110] For a dual-polarization unit, the two feed plates 13 need to maintain a strict 90° orthogonal relationship to achieve high polarization isolation. Twisting the welded portions 1331 of the two feed plates 13 by 45° ensures that they maintain the correct electrical phase relationship when connected to the phase-shifting network 42, and does not introduce crosstalk due to the change in connection direction.

[0111] In some embodiments of this application, such as Figures 16 to 20 As shown, when the first mounting foot 1101 is correspondingly set with the balun arm 1103, that is, the first mounting foot 1101 is formed by cutting and bending on the balun arm 1103. The first mounting foot 1101 is flush with the base 1107. The side wall of the phase shifter cavity 41 and the bottom of the radiator 11 is correspondingly set and extends outward along the width direction to form the first connecting part 4105. The first mounting foot 1101 and the first connecting part 4105 are correspondingly set, and the third through hole 4103 is provided on the first connecting part 4105.

[0112] Specifically, the side wall of the phase shifter cavity 41 corresponding to the bottom of the radiator 11 extends outward along the width direction to form two first connecting portions 4105. When the bottom of the radiator 11 is connected to the reflector 3 and the phase shifter cavity 41, since the first mounting foot 1101 is carved out of the balun arm 1103, the first mounting foot 1101 will extend to the upper part of the outer side of the phase shifter cavity 41, that is, the position corresponding to the first connecting portion 4105. Therefore, the third through hole 4103 is set in the first connecting portion 4105 to facilitate connection with the first mounting foot 1101.

[0113] For example, there are four first mounting feet 1101, with one first connecting part 4105 corresponding to two first mounting feet 1101. The conductive connector 2 includes a conductive screw, and the third through hole 4103 is configured as a threaded hole. The conductive screw passes through the first connecting hole 1109 and the second through hole and then engages with the third through hole 4103 through a thread, thereby realizing the electrical connection between the radiator 11 and the phase shifter cavity 41. At the same time, the conductive screw can also fix the radiator 11. In some embodiments of this application, there are two conductive screws, with two first mounting feet 1101 connected to the phase shifter cavity 41 by conductive screws, and the remaining two first mounting feet 1101 fixed to the reflector 3 and the phase shifter cavity 41 by rivets.

[0114] like Figures 1 to 4As shown, when the first mounting foot 1101 is correspondingly set with the balun slit 1110, the inner wall of the side wall of the phase shifter cavity 41 corresponding to the bottom wall of the radiator 11 protrudes inward along the thickness direction to form a second connecting part 4101. The second connecting part 4101 is provided with two third through holes 4103. The two oppositely set first mounting feet 1101 are correspondingly set with the two third through holes 4103 for electrically connecting the radiator 11 and the phase shifter cavity 41. The other two oppositely set first mounting feet 1101 are fixedly connected to the reflector.

[0115] Specifically, when the first mounting foot 1101 is correspondingly set with the balun slot 1110, when the radiator 11 is installed with the reflector 3 and the phase shifter 4, in order to realize the corresponding connection between the feed plate 13 and the phase shifting network 42, a pair of oppositely set first mounting feet 1101 are located in the middle of the width direction of the phase shifter cavity 41, that is, directly above the partition plate 4106 of the phase shifter cavity 41, and the other two oppositely set first mounting feet 1101 are located on the outside of the two chambers of the phase shifter cavity 41 respectively. The upper sidewall of the phase shifter cavity 41 protrudes inward to form a second connecting part 4101. The upper end of the partition plate 4106 is correspondingly connected to the second connecting part 4101. The third through hole 4103 is correspondingly provided on the second connecting part 4101. The setting of the second connecting part 4101 provides the basis for the setting of the third through hole 4103. Compared with the planar sidewall, the second connecting part 4101 of the protruding structure 1102 has stronger shear resistance and can withstand the pre-tightening force of the conductive connector 2 (such as a conductive bolt) without easily deforming. The stress concentration area at the connection point is transferred from the thin wall of the cavity to the protruding second connecting part 4101, avoiding fatigue damage to the cavity caused by long-term stress and extending its service life.

[0116] The second connecting part 4101 is provided with two third through holes 4103, which correspond to and are electrically connected to the two opposite first mounting feet 1101, forming a two-point conductive path of "radiator 11-reflector 3-phase shifter cavity 41". The conductive connection point corresponds to the position of the balun slot 1110, which can more directly guide the stray current on the balun arm 1103 into the grounding path, further suppressing electromagnetic interference.

[0117] The other two opposing first mounting feet 1101 are only fixed to the reflector plate 3 (not electrically connected to the phase shifter cavity 41), forming a differentiated layout of "two-point conductivity + two-point fixation". The mechanical fixing point is separated from the conductive connection point, avoiding all mounting feet bearing the preload of the conductive connection, making the fixation of the radiator 11 and the reflector plate 3 more balanced, and reducing the deformation of the radiator 11 caused by excessive local stress.

[0118] In this embodiment, two rivets and two conductive screws, or four conductive screws, are used to connect the radiator 11, the reflector 3, and the phase shifter cavity 41. The number of fasteners is reduced, thus lowering the risk of intermodulation.

[0119] It should be noted that in some embodiments of this application, the radiating wall 1104 can be a rectangle with a width close to that of the balun arm 1103, or it can be a sector or a square. When the radiating wall 1104 is a rectangle with a width close to that of the balun arm 1103, a large space is formed between adjacent radiating walls 1104, which does not affect the installation of conductive screws or rivets; when the radiating wall 1104 is a sector or a square, and the distance between adjacent radiating walls 1104 is small, it is necessary to leave operating holes on the radiating wall 1104 to facilitate the installation of conductive screws or rivets.

[0120] The inner wall of the phase shifter cavity 41 is provided with a slot 4102 for snapping and fixing the PCB board of the phase shifter network 42.

[0121] like Figure 21 As shown, multiple radiating elements can be installed on the reflector 3, and the operating frequency bands of the multiple radiating elements can be equal or unequal.

[0122] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0123] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A base station antenna, characterized by, The application relates to a radiation unit (1) comprising a radiator (11), a support (12) and two feed sheets (13), the radiator (11) has a balun cavity, the support (12) is arranged in the balun cavity and is clamped with the radiator (11), the two feed sheets (13) are arranged in the support (12) in a cross shape, the bottom of the radiator (11) is provided with a first connecting hole (1109) and a second connecting hole (1108), the first connecting hole (1109) is used for fixing the radiator (11), the first end of the feed sheet (13) is coupled with the radiator (11), the second end of the feed sheet (13) is provided with a welding part (1331), the welding part (1331) passes out from the second connecting hole (1108). The application further relates to a reflection plate (3) provided with a first through hole and a second through hole, the first through hole is configured to pass through the feed sheet (13), the second through hole is arranged in correspondence with the first connecting hole (1109). The application further relates to a phase shifter (4) arranged on both sides of the reflection plate (3) in the thickness direction of the reflection plate (3) and comprising a phase shifter cavity (41) and a phase shift network (42) arranged in the phase shifter cavity (41), the phase shifter cavity (41) is provided with a third through hole (4103) and a relief hole (4104), the third through hole (4103) is arranged in correspondence with the second through hole and the first connecting hole (1109), a conductive connecting piece (2) passes through the first connecting hole (1109), the second through hole and the third through hole (4103) in sequence to conductively connect the radiator (11) and the phase shifter cavity (41), the relief hole (4104) is arranged in correspondence with the first through hole, the welding part (1331) passes through the bottom of the radiator (11), the first through hole and the relief hole (4104) in sequence and is electrically connected with the phase shift network (42). The radiator (11) comprises a base (1107), four balun arms (1103) and a radiation wall (1104), the four balun arms (1103) are arranged in pairs opposite to each other along the circumference of the base (1107), the balun arms (1103) and the base (1107) jointly enclose the balun cavity, one end of the balun cavity away from the base (1107) is open, and a balun gap (1110) is formed between adjacent balun arms (1103), and the radiation wall (1104) is arranged at one end of the balun arms (1103) away from the base (1107).

2. The base station antenna of Claim 1, wherein, The radiator (11) is a metal plate part integrally bent.

3. The base station antenna of Claim 1, wherein, The support (12) comprises a support disc, four support arms (1205) and four limiting arms (1203), the four support arms (1205) and the four limiting arms (1203) are arranged in an interlaced manner along the circumference of the support disc and are connected with the lower surface of the support disc.

4. The base station antenna of Claim 2, wherein, ​ The support arm (1205) is arranged one-to-one corresponding to the balun arm (1103), and a first buckle (1210) is arranged at a position corresponding to the support arm (1205), a first abutting portion (1207) is arranged on the support arm, a first clamping hole (1106) is arranged at a corresponding position of the balun arm (1103), the first buckle (1210) is clamped in the first clamping hole (1106) in correspondence, and the first abutting portion (1207) abuts against the inner wall of the balun arm (1103). The limiting arm (1203) is embedded one-to-one corresponding in the balun slot (1110), and the lower end of the limiting arm (1203) is protruded to form two limiting protrusions (1204) along the width direction, and the two limiting protrusions (1204) abut against the outer walls of the balun arms (1103) on both sides of the balun slot (1110) respectively.

5. The base station antenna of Claim 4, wherein, The lower end of the support arm (1205) is provided with a second abutting portion (1206) on the outer side opposite to the balun arm (1103), the second abutting portion (1206) abuts against the inner wall of the balun arm (1103), and a first perforation (1209) is arranged on the second abutting portion (1206), a second perforation (1211) is arranged at a corresponding position of the support disc, and the feed sheet (13) is arranged in the first perforation (1209) and the second perforation (1211).

6. The base station antenna of Claim 5, wherein, The support disc is annular, the support arm (1205) is connected to the inner side of the support disc, and the limiting arm (1203) is connected to the outer side of the support disc; the upper end of the support arm (1205) is provided with an avoiding gap (1202), the feed sheet (13) is clamped in the avoiding gap (1202), and the inner side of the support arm (1205) is provided with a second buckle (1201), and the two second buckles (1201) on the inner sides of the two support arms (1205) abut against the upper surfaces on both sides of the corresponding feed sheet (13) in the width direction respectively.

7. The base station antenna of Claim 4, wherein, The lower end of the support arm (1205) matched with the welding portion (1331) is provided with an isolation cover (1208), the isolation cover (1208) is coaxially arranged with the first perforation (1209), and the isolation cover (1208) is inserted in the second connecting hole (1108) to isolate the welding portion (1331) arranged in the isolation cover (1208) from the radiator (11).

8. The base station antenna of Claim 1, further characterized by, The feeding piece (13) comprises a first connecting section (131), a second connecting section (132) and a third connecting section (133) arranged in sequence along the length direction, the first connecting section (131) is coupled with the radiator (11), the third connecting section (133) is arranged opposite to the first connecting section (131), the second connecting section (132) is connected between the upper end of the first connecting section (131) and the upper end of the third connecting section (133), the lower end of the first connecting section (131) forms the first end, and the lower end of the third connecting section (133) forms the welding part (1331); The welding part (1331) is columnar or sheet-shaped, when the welding part (1331) is sheet-shaped, the welding part (1331) is twisted by 45° with respect to the upper part of the third connecting section (133), so that the welding part (1331) can be connected with the phase shift network (42) in close contact.

9. The base station antenna of Claim 2, wherein, The base (1107) extends radially outward to form a first mounting leg (1101), the first mounting leg (1101) is provided with a protruding structure (1102), the bottom surface of the protruding structure (1102) is protruded downward, and the first connecting hole (1109) penetrates the protruding structure (1102).

10. The base station antenna of Claim 9, wherein, The number of the first mounting leg (1101) is four, The four first mounting legs (1101) are arranged one by one with the balun seam (1110), the inner wall of the side wall of the phase shifter cavity (41) corresponding to the bottom of the radiator (11) is protruded inward along the thickness direction to form a second connecting part (4101), the second connecting part (4101) is provided with two third through holes (4103), the two first mounting legs (1101) arranged oppositely are arranged corresponding to the two third through holes (4103), for electrically connecting the radiator (11) and the phase shifter cavity (41), and the remaining two first mounting legs (1101) arranged oppositely are fixedly connected with the reflector plate (3); Or, the four first mounting legs (1101) are arranged one by one with the balun arm (1103), the side wall of the phase shifter cavity (41) corresponding to the bottom of the radiator (11) is extended outward along the width direction to form a first connecting part (4105), the first mounting leg (1101) is arranged corresponding to the first connecting part (4105), and the third through hole (4103) is arranged on the first connecting part (4105).

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