A radiation unit and an antenna

Abstract

The application discloses a radiation unit and an antenna, and relates to the technical field of antennas. The radiation unit comprises a base and four diagonally arranged dipoles. A raised platform is arranged above the base, and the raised platform is used for supporting a high-frequency radiation unit. The four diagonally arranged dipoles are arranged around the base. The dipole comprises two radiation arms and two balun arms. The balun arms are used for supporting the radiation arms. A metal wall is arranged between the balun arms of every two adjacent dipoles. The ends of the radiation arms of every two adjacent dipoles are connected through a first structural member. The radiation arm comprises a square frame, a first panel and a folding panel. The folding panel is connected with the outer long side and the short side close to the end of the square frame respectively. The first panel is connected with the inner long side of the square frame and the folding panel respectively. The application can effectively reduce the debugging cost.

Description

Technical Field

[0001] This application relates to the field of antenna technology, and in particular to a radiating element and an antenna. Background Technology

[0002] With the continuous development of antenna technology, ultra-wideband, multi-band, and miniaturization have gradually become important development directions for antennas. Nested high-frequency and low-frequency elements are crucial technologies for achieving ultra-wideband, multi-band, and miniaturized antennas. The radiating element is the core unit for transmitting and receiving electromagnetic waves in a base station antenna; it is the decisive component for the normal operation of the base station antenna, and its design directly determines the radiation performance of the base station antenna.

[0003] When antenna elements are assembled into an array, performance testing and debugging are usually carried out after assembly to improve production efficiency. However, in mass production, some vibrators inevitably have manufacturing deviations, which increases debugging costs.

[0004] Therefore, there is an urgent need to design a radiation unit that can effectively reduce debugging costs. Summary of the Invention

[0005] The main objective of this application is to at least solve one of the technical problems existing in the prior art, and to propose a radiating element and antenna that can effectively reduce debugging costs.

[0006] To achieve the above objectives, in a first aspect, embodiments of this application propose a radiation unit, comprising: a base and four diagonally arranged dipoles; a raised platform is provided above the base for supporting a high-frequency radiation unit; the four diagonally arranged dipoles are arranged around the base, each dipole comprising two radiation arms and two balun arms, the balun arms supporting the radiation arms, and a metal wall is provided between each pair of adjacent balun arms of the dipoles; wherein the ends of the radiation arms of each pair of adjacent dipoles are connected by a first structural member, each radiation arm comprising a square frame, a first panel, and a folding panel, the folding panel being connected to the outer long side and the short side near the end of the square frame respectively, and the first panel being connected to the inner long side of the square frame and the folding panel respectively. In some embodiments, a filter stub is also provided on each balun arm, the filter stub being parallel to the upper edge of the metal wall.

[0007] In some embodiments, the first structural member includes a second panel, a third panel, a positioning plate, and four first snap-fit ​​members. The third panel is vertically connected to the outer long side of the second panel. The positioning plate is connected to both the second panel and the third panel. Two of the first snap-fit ​​members are disposed on the outer long side of the second panel, and the other two of the first snap-fit ​​members are disposed on the inner long side of the second panel.

[0008] In some embodiments, the system further includes four first parasitic units, each having a first receiving groove in the first structural member, and the first parasitic units snapping into the first receiving groove.

[0009] In some embodiments, four second parasitic units are also included, which are disposed on the two balun arms of each dipole via a second structural member.

[0010] In some embodiments, the second structural member includes a fourth panel and a plurality of second snap-fit ​​members, the plurality of second snap-fit ​​members being disposed on the fourth panel, the second snap-fit ​​members being used to snap onto the two balun arms of each dipole, a second receiving groove being provided on the outer side of the fourth panel, the second parasitic unit being snapped into the second receiving groove.

[0011] In some embodiments, a groove is provided in the middle of one balun arm of each dipole for accommodating a coaxial cable, and a welding area is provided in the other balun arm, the inner conductor of the coaxial cable being connected to the welding area.

[0012] In some embodiments, the two balun arms in each dipole are both inclined at 45 degrees on the base.

[0013] In some embodiments, a hollow area is provided between the metal wall and the radiating arms of every two adjacent dipoles.

[0014] In a second aspect, embodiments of this application provide an antenna comprising a radiating element as described in any one of the embodiments of the first aspect.

[0015] According to an embodiment of the present invention, a radiating element and antenna have at least the following beneficial effects: four diagonally deployed dipoles form a bowl-shaped radiating element with a ±45 degree dual polarization. The ends of the radiating arms of every two adjacent dipoles are connected by a first structural member. When the antenna vibrates, the first structural member enhances the strength of the radiating arms, preventing deformation and thus improving signal quality. The radiating arm includes a square frame, a first panel, and a folded panel. The square frame is formed by two different electrical length paths (one long and one short), with each electrical path in the frame corresponding to the operating frequency of the radiating element. The antenna operates at a frequency within a certain range, and the frame has a square hole in the middle. The square hole design not only matches the impedance but also expands the frequency range. On the other hand, the folded panel is connected to the outer long side and the short side near the end of the square frame, respectively. Compared with the scheme of setting a point coupling structure by extending downward at the connection point of the long and short sides in the square frame, the surface coupling structure of the folded panel can increase the effective radiation distance and make the impedance change smoother. This not only allows for accurate and detailed control of the antenna's resonance characteristics and effectively expands the antenna's operating frequency range but also increases the error capacity, thereby reducing the need for debugging. Attached Figure Description

[0016] The accompanying drawings are provided to further understand the technical solutions of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the technical solutions of the present invention, and do not constitute a limitation on the technical solutions of the present invention.

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments; Figure 1 This is a schematic diagram of the structure of a radiating unit at a first angle provided by the present invention; Figure 2 This is a schematic diagram of the structure of a second angle of a radiating unit provided by the present invention; Figure 3 This is a schematic diagram of the structure of a radiating unit at the third angle provided by the present invention; Figure 4 This is a schematic diagram of the structure of the first structural component and the second structural component in a radiating unit provided by the present invention; Figure 5 This is a diagram showing the arrangement of coaxial cables on the balun arm in a radiating unit provided by the present invention; Figure 6 This is an S-parameter diagram of a two-port radiating element provided by the present invention. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0019] It should be noted that the terms "first," "second," etc., in the specification, claims, and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.

[0021] When antenna elements are assembled into an array, performance testing and debugging are usually carried out after assembly to improve production efficiency. However, in mass production, some vibrators inevitably have manufacturing deviations, which increases debugging costs.

[0022] Based on this, embodiments of the present invention provide a radiating element and antenna that can effectively reduce debugging costs.

[0023] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0024] Firstly, referring to Figure 1-5 This invention application proposes a radiation unit, including: a base 100 and four diagonally arranged dipoles; a raised platform 110 is provided above the base 100 for supporting the high-frequency radiation unit; the four diagonally arranged dipoles are arranged around the base 100, and each dipole includes two radiation arms 210 and two balun arms 220, which support the radiation arms 210. A metal wall 300 is provided between each pair of adjacent dipole balun arms 220; wherein, the ends of each pair of adjacent dipole radiating arms 210 are connected through a first structural member 400, and the radiation arm 210 includes a square frame 211, a first panel 212 and a folded panel 213, the folded panel 213 is connected to the outer long side 11 and the short side 12 near the end of the square frame 211 respectively, and the first panel 212 is connected to the inner long side 13 of the square frame 211 and the folded panel 213 respectively. It should be noted that in the traditional technology, the radiating arm 210 is a square panel shape, and most of the current will act at the shortest length position of the radiating arm 210, resulting in poor impedance matching. However, this application uses a square frame 211 to form the radiating arm 210, and the square hole in the middle can not only match the impedance, but also expand the frequency range of the radiating unit.

[0025] It should be noted that, referring to Figure 3The first panel 212 is connected to the inner long side 13 of the square frame 211 and the folded panel 213 respectively. Specifically, the first panel 212 is connected to the inner long side 13 of the square frame 211 and extends downward to connect with the folded panel 213. When the antenna vibrates, the strength of the radiating arm 210 can be further improved through the first panel 212 to prevent the radiating arm 210 from deforming, thereby improving the signal quality.

[0026] It should be noted that, referring to Figure 2 A metal wall 300 is provided between the balun arms 220 of every two adjacent dipoles. The metal wall 300 can be used to adjust the impedance matching of the radiating unit in the operating frequency band.

[0027] Preferably, refer to Figure 3 A protrusion 14 is provided in the radiating arm 210 of each dipole near the balun arm 220, which is beneficial for adjusting impedance matching.

[0028] In some embodiments, the base 100 is connected to four diagonally deployed dipoles and a metal wall 300, and the base 100, the four diagonally deployed dipoles and the metal wall 300 are integrally die-cast.

[0029] In some embodiments, the two balun arms 220 in each dipole are both inclined at 45 degrees on the base 100.

[0030] Understandably, on the one hand, the balun arm 220's mechanical structure is simpler and more rigid through its linear tilt design, which can reduce performance deviations caused by deformation or vibration; on the other hand, the symmetrical 45-degree tilt helps to achieve balanced feeding, reduce common-mode current, and improve the antenna's cross-polarization ratio and front-to-back ratio.

[0031] In some embodiments, refer to Figure 2 Each balun arm 220 is also provided with a filter stub 500, which is parallel to the upper edge of the metal wall 300.

[0032] It should be noted that existing sheet metal nested antennas can only solve the high-low frequency coupling problem by designing high-frequency reflectors, raising the nested high-frequency units, or increasing the aperture of low-frequency units to ensure that the performance of each frequency band does not deteriorate. This not only increases production costs but also increases debugging difficulty. Based on this, this application uses the principle of microstrip circuits to set a stub as a filter stub 500 on each balun arm 220. Through the coupling between the filter stub 500 and the balun arm 220, the current scattered by the embedded high-frequency radiating unit to the bowl-shaped radiating unit can be suppressed to reduce high-low frequency coupling, thereby improving the S-parameter convergence and radiation pattern performance of the radiating unit.

[0033] In some embodiments, a hollow area is provided between the metal wall 300 and the radiating arm 210 of each pair of adjacent dipoles.

[0034] Understandably, the hollowed-out area reduces the obstruction of the high-frequency radiating unit, allowing the electromagnetic waves radiated by the high-frequency radiating unit to radiate along the original path, thereby further reducing the high- and low-frequency coupling of the high-frequency radiating unit and further improving the convergence of the S-parameters and the radiation pattern index of the radiating unit.

[0035] In some embodiments, refer to Figure 2 as well as Figure 4 The first structural component 400 includes a second panel 410, a third panel 420, a positioning plate 430, and four first snap-fit ​​pieces 440. The third panel 420 is vertically connected to the outer long side of the second panel 410. The positioning plate 430 is connected to both the second panel 410 and the third panel 420. Two first snap-fit ​​pieces 440 are disposed on the outer long side of the second panel 410, and the other two first snap-fit ​​pieces 440 are disposed on the inner long side of the second panel 410.

[0036] It should be noted that when the first structural member 400 is used to connect the ends of the radiating arms 210 of every two adjacent dipoles, the second panel 410 in the first structural member 400 covers the top of the square frame 211; the third panel 420 covers the front of the folded panel 213 connected to the outer long side 11 in the square frame 211; the positioning plate 430 is snapped into the gap between the ends of the radiating arms 210 of every two adjacent dipoles. During assembly, the connection can be completed simply by aligning the positioning plate 430 with the gap and pressing it down, which helps to improve assembly efficiency; the two first snap-fit ​​pieces 440 are snapped to the outside of the outer long side 11 of the square frame 211 of the two adjacent dipoles, and the other two first snap-fit ​​pieces 440 are snapped to the inside of the outer long side 11 of the square frame 211 of the two adjacent dipoles.

[0037] Preferably, the positioning plate 430 is disposed in the middle of the second panel 410 and the third panel 420, ensuring that when the positioning plate 430 is snapped into the gap between the ends of the radiating arms 210 of each two adjacent dipoles, sufficient distance can be reserved at both ends of the second panel 410 so that the first snap-fit ​​member 440 disposed on the second panel 410 can be snapped into the outer long side 11 of the square frame 211 of the two adjacent dipoles respectively.

[0038] Preferably, the second panel 410 is provided with a sun-shaped opening, which helps to reduce the overall weight of the radiating unit, reduce production costs, and facilitate subsequent processing.

[0039] Preferably, the end of the first snap-fit ​​member 440 is provided with a barb. When the first structural member 400 is used to connect the ends of the radiating arms 210 of every two adjacent dipoles, the positioning plate 430 is aligned with the gap and pressed down. The barb at the end of the first snap-fit ​​member 440 is engaged with the outer long side 11 of the square frame 211 of the two adjacent dipoles. Under the coordinated action of the first snap-fit ​​member 440 and the positioning plate 430, the installation efficiency of the first structural member 400 is effectively improved.

[0040] In some embodiments, refer to Figure 4 It also includes four first parasitic units 600, and a first receiving groove 450 is provided in the first structural member 400, and the first parasitic unit 600 is snapped into the first receiving groove 450.

[0041] Preferably, the first parasitic unit 600 has a hexagonal structure, and correspondingly, the first receiving groove 450 also has a hexagonal structure.

[0042] It should be noted that when the first structural member 400 is used to connect the ends of the radiating arms 210 of every two adjacent dipoles, the first parasitic unit 600 is correspondingly set at the ends of the two adjacent radiating arms 210, which can play the role of extending the radiation path. Since the length of a radiating arm 210 is much smaller than half the wavelength of the operating frequency band, the ends of the radiating arms 210 of two adjacent dipoles can be made to appear as one radiating arm 210 through the enhanced coupling of the hexagonal parasitic unit. In some embodiments, refer to Figure 4 A first receiving groove 450 is provided on the outer surface of the third panel 420, and the first parasitic unit 600 is snapped into the first receiving groove 450.

[0043] It is understandable that by adjusting the distance between the first parasitic unit 600 and the ends of the radiating arms 210 of every two adjacent dipoles, impedance matching can be effectively controlled and the performance of the radiating unit can be improved.

[0044] Furthermore, if the distance between the first parasitic unit 600 and the ends of the radiating arms 210 of each pair of adjacent dipoles is to be adjusted, it can be achieved by replacing the first structural component 400 with a different model, so that the distance between the third panel 420 in the first structural component 400 and the ends of the radiating arms 210 of the two adjacent dipoles changes. This is simple to operate and reduces debugging costs.

[0045] In some embodiments, refer to Figure 4 It also includes four second parasitic units 700, which are disposed on the two balun arms 220 of each dipole via second structural members 800.

[0046] Understandably, during commissioning, the second structural member 800 used to fix the second parasitic unit 700 can slide along the two balun arms 220 of each dipole in order to find the best coupling point and reduce commissioning costs.

[0047] In some embodiments, refer to Figure 4 The second structural member 800 includes a fourth panel 810 and a plurality of second snap-fit ​​members 820. The plurality of second snap-fit ​​members 820 are disposed on the fourth panel 810. The second snap-fit ​​members 820 are used to snap onto the two balun arms 220 of each dipole. A second receiving groove 830 is provided on the outer side of the fourth panel 810. The second parasitic unit 700 is snapped into the second receiving groove 830.

[0048] Preferably, the second parasitic unit 700 has a quadrilateral structure, and correspondingly, the second receiving groove 830 is also set as a quadrilateral structure.

[0049] Preferably, the fourth panel 810 is provided with multiple openings, which helps to reduce the overall weight of the radiation unit, reduce production costs, and facilitate subsequent processing.

[0050] It should be noted that, referring to Figure 4 The second structural component 800 also includes a positioning component 840, which is located in the middle of the fourth panel 810. When the second structural component 800 is set on the two balun arms 220 of each dipole, the positioning component 840 is engaged in the gap between the two balun arms 220. Under the action of the positioning component 840, during assembly, it is only necessary to align the positioning component 840 with the gap between the two balun arms 220 and press it down to complete the connection, which helps to improve assembly efficiency.

[0051] Preferably, the end of the second snap-fit ​​member 820 is provided with a barb. When the second structural member 800 is installed on the two balun arms 220 of each dipole, the positioning member 840 on the fourth panel 810 is aligned with the gap between the two balun arms 220 and pressed down. The barb at the end of the second snap-fit ​​member 820 is engaged with the outer side of the two balun arms 220. Under the coordinated action of the second snap-fit ​​member 820 and the positioning member 840, the installation efficiency of the second structural member 800 is effectively improved.

[0052] Understandably, the second parasitic unit 700 is snapped into the second receiving slot 830. By adjusting the distance between the second parasitic unit 700 and the two balun arms 220, impedance matching can be effectively controlled, thereby improving the performance of the radiating unit.

[0053] Furthermore, if the distance between the second parasitic unit 700 and the two balun arms 220 is to be adjusted, it can be achieved by replacing the second structural component 800 with a different model, so that the distance between the fourth panel 810 in the second structural component 800 and the two balun arms 220 changes. This is simple to operate and reduces debugging costs.

[0054] In some embodiments, refer to Figure 2 Each balun arm 220 is also provided with a filter stub 500, which is parallel to the upper edge of the metal wall 300. It also includes four second parasitic units 700. The second parasitic units 700 are provided on the two balun arms 220 of each dipole through a second structural member 800. The second structural member 800 includes a fourth panel 810 and a plurality of second snap-fit ​​members 820. The plurality of second snap-fit ​​members 820 are provided on the fourth panel 810 and are used to snap onto the two balun arms 220 of each dipole. A second receiving groove 830 is provided on the outer side of the fourth panel 810, and the second parasitic units 700 are snapped into the second receiving groove 830.

[0055] Preferably, there are four second snap-fit ​​pieces 820, which are evenly distributed at the four corners of the fourth panel 810.

[0056] It should be noted that the second structural component 800 is disposed on the two balun arms 220 of each dipole, and the filter stub 500 is snapped below the two second snap-fit ​​components 820 located at the upper end of the fourth panel 810. On the one hand, the filter stub 500 can suppress the current scattered by the embedded high-frequency radiation unit to the bowl-shaped radiation unit to solve the high-low frequency coupling problem, thereby improving the convergence of the radiation unit's S-parameters and the radiation pattern index; on the other hand, under the support of the filter stub 500, the second structural component 800 is more stably disposed on the two balun arms 220.

[0057] In some embodiments, refer to Figure 5 A groove 221 is provided in the middle of one balun arm 220 of each dipole to accommodate the coaxial cable 900. A welding area 222 is provided in the other balun arm 220, and the inner conductor 910 of the coaxial cable 900 is connected to the welding area 222.

[0058] Understandably, the coaxial cable 900 is positioned in the groove 221 in the middle of the balun arm 220, which can eliminate the high-order modes generated by the coaxial cable 900 feed, ensuring that only the TEM mode is transmitted, avoiding energy efficiency reduction and signal distortion, thereby improving the antenna gain.

[0059] Preferably, the resistance of the coaxial cable 900 is 75 ohms. Additionally, refer to... Figure 2The base 100 has a hole 120 for the coaxial cable 900 to pass through. Using the principle of a power divider, a 75-ohm coaxial cable 900 (with impedance matched to 100 ohms) is soldered to the balun arm 220 for power supply. At the same time, the 75-ohm coaxial cable 900 passes through the hole 120 to the back of the base 100 and is connected to a 50-ohm cable using a two-in-one interface. This allows the 50-ohm cable to output the same signal to the two 75-ohm coaxial cables 900 with the same polarization, and then transmit it to the radiation arm 210 with the same polarization.

[0060] In some embodiments, four second parasitic units 700 are also included, which are disposed on the two balun arms 220 of each dipole via a second structural member 800; a groove 221 is provided in the middle of one balun arm 220 of each dipole for accommodating a coaxial cable 900, and a welding area 222 is provided in the other balun arm 220, wherein the inner conductor 910 of the coaxial cable 900 is connected to the welding area 222.

[0061] Understandably, the coaxial cable 900 is placed in the groove 221 in the middle of the balun arm 220. In conjunction with the second parasitic unit 700, it can make the actual debugging process more flexible and easier to obtain a good standing wave ratio.

[0062] In a second aspect, embodiments of this application provide an antenna comprising a radiating element as described in any one of the embodiments of the first aspect.

[0063] It should be noted that by using the first and second structural components in appropriate positions, the operating frequency band of the radiating element can reach 690-960MHz. Each electrical path in the square frame 211 corresponds to a frequency point within the operating frequency range of the radiating element. The frequency point corresponding to the long side 11 of the square frame 211 is 155MHz, and the frequency point corresponding to the short side 12 of the square frame 211 is 920MHz. Furthermore, within the required frequency band, the antenna's S11 and S22 values ​​are both less than -15dB, and the S21 value is less than -25dB, indicating that the antenna has low reflection and good isolation effect. (Refer to...) Figure 6 As shown.

[0064] According to an embodiment of the present invention, a radiating element and antenna are provided. Four diagonally deployed dipoles form a bowl-shaped radiating element with a ±45 degree dual polarization. The ends of the radiating arms 210 of every two adjacent dipoles are connected by a first structural member 400. When the antenna vibrates, the first structural member 400 increases the strength of the radiating arms 210, preventing deformation and thus improving signal quality. The radiating arms 210 include a square frame 211, a first panel 212, and a folded panel 213. On one hand, the square frame 211 is formed by two different electrical length paths, one long and one short. Each electrical path in the frame corresponds to the operation of the radiating element. The antenna has a single frequency point within the range, and the frame has a square hole in the middle. The square hole design can not only match the impedance but also expand the frequency range. On the other hand, the folded panel 213 is connected to the outer long side 11 and the short side 12 near the end of the square frame 211, respectively. Compared with the scheme of setting a point coupling structure by extending downward at the connection point of the long side and the short side 12 in the square frame 211, the surface coupling structure of the folded panel 213 can increase the effective radiation distance and make the impedance change smoother. It can not only accurately and meticulously control the resonance characteristics of the antenna and effectively expand the operating frequency range of the antenna, but also increase the error capacity and achieve the effect of reducing debugging.

[0065] Obviously, the embodiments described above are merely some embodiments of this application, not all embodiments. The accompanying drawings show preferred embodiments of this application, but do not limit the scope of protection of this application. This application can be implemented in many different forms; rather, the purpose of providing these embodiments is to provide a more thorough and comprehensive understanding of the disclosure of this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this application's specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the scope of patent protection of this application.

Claims

1. A radiating unit, characterized in that, include: A base, with a raised platform on top of the base, the raised platform being used to support the high-frequency radiation unit; Four diagonally deployed dipoles are arranged around the base. Each dipole includes two radial arms and two balun arms, which support the radial arms. A metal wall is provided between the balun arms of each pair of adjacent dipoles. The ends of the radiating arms of each pair of adjacent dipoles are connected by a first structural member. The radiating arm includes a square frame, a first panel, and a folding panel. The folding panel is connected to the outer long side and the short side near the end of the square frame, respectively. The first panel is connected to the inner long side of the square frame and the folding panel, respectively. In addition, a filter stub is provided on each balun arm, the filter stub being parallel to the upper edge of the metal wall.

2. The radiating unit according to claim 1, characterized in that, The first structural component includes a second panel, a third panel, a positioning plate, and four first snap-fit ​​pieces. The third panel is vertically connected to the outer long side of the second panel. The positioning plate is connected to both the second panel and the third panel. Two first snap-fit ​​pieces are disposed on the outer long side of the second panel, and the other two first snap-fit ​​pieces are disposed on the inner long side of the second panel.

3. The radiating element according to claim 1, characterized in that, It also includes four first parasitic units, and a first receiving groove is provided in the first structural member, in which the first parasitic units are snapped into the first receiving groove.

4. The radiating unit according to claim 1, characterized in that, It also includes four second parasitic units, which are disposed on the two balun arms of each dipole via a second structural member.

5. The radiating unit according to claim 4, characterized in that, The second structural component includes a fourth panel and a plurality of second snap-fit ​​members. The plurality of second snap-fit ​​members are disposed on the fourth panel. The second snap-fit ​​members are used to snap onto the two balun arms of each dipole. A second receiving groove is provided on the outer side of the fourth panel, and the second parasitic unit snaps into the second receiving groove.

6. The radiating element according to claim 1, characterized in that, A groove is provided in the middle of one balun arm of each dipole to accommodate a coaxial cable, and a welding area is provided in the other balun arm, to which the inner conductor of the coaxial cable is connected.

7. The radiating element according to claim 1, characterized in that, The two balun arms in each dipole are set on the base at a 45-degree angle.

8. The radiating element according to claim 1, characterized in that, A hollow area is provided between the metal wall and the radiating arms of every two adjacent dipoles.

9. An antenna, characterized in that, Includes the radiating unit as described in any one of claims 1-8.

Images