Radiation assembly and antenna

By nesting a high-frequency oscillator within a low-frequency oscillator in the radiating assembly, and by setting up an installation space and a power supply channel within the low-frequency oscillator, the structural instability and complex assembly problems of the high- and low-frequency coaxial nested radiating unit are solved, achieving efficient and stable signal transmission and a simplified production process.

CN224264265UActive Publication Date: 2026-05-19COMBA TELECOM TECH (GUANGZHOU) CO LTD +3
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
COMBA TELECOM TECH (GUANGZHOU) CO LTD
Filing Date
2025-04-30
Publication Date
2026-05-19

AI Technical Summary

Technical Problem

Existing high- and low-frequency coaxial nested radiating units present numerous challenges in structural design, assembly processes, and automated production, leading to increased signal transmission loss, structural instability, and difficulty in achieving large-scale production.

Method used

Design a radiating component in which a high-frequency vibrator is embedded in the installation space of a low-frequency vibrator, a support member passes through the installation channel, and a power supply core passes through the power supply channel to be led out to the outside of the low-frequency vibrator and electrically connected to a coaxial cable, so as to prevent the coaxial cable from entering the interior of the low-frequency vibrator, and a mounting platform is set in the installation space to stabilize the high-frequency vibrator.

Benefits of technology

The electrical performance of the radiating components was optimized, improving signal transmission stability and power feeding efficiency, simplifying the assembly process, reducing production costs, and enhancing the overall reliability and production efficiency of the antenna.

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Abstract

The utility model provides a radiation assembly and an antenna, the radiation assembly comprises a low-frequency oscillator and a high-frequency oscillator, an installation space is formed in the low-frequency oscillator, an installation table is arranged in the installation space, a through installation channel is formed in the installation table, the high-frequency oscillator is embedded in the installation space, and the high-frequency oscillator is embedded in the installation space. The high-frequency oscillator comprises a high-frequency radiation arm, a supporting piece and a feed core, the high-frequency radiation arm is connected with the supporting piece, the supporting piece penetrates through the mounting channel, a through feed channel is formed in the supporting piece, and the feed core penetrates through the feed channel to feed the high-frequency radiation arm. The radiation assembly is provided with the supporting piece led out of the low-frequency oscillator, so that the feed core of the high-frequency oscillator is led out of the low-frequency oscillator through the feed channel in the supporting piece, the feed core is electrically connected with a coaxial cable conveniently, the coaxial cable does not need to be led into the low-frequency oscillator, and the electrical performance of the radiation assembly is improved.
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Description

Technical Field

[0001] This utility model belongs to the field of mobile communication technology, specifically relating to a radiating component and an antenna configured with the radiating component. Background Technology

[0002] In the rapid development of wireless communication technology, antennas, as crucial components for signal transmission and reception, directly impact the overall performance of communication systems through their performance and structural design. Especially in communication scenarios requiring simultaneous coverage of high and low frequency bands, high- and low-frequency coaxial nested radiating elements have become a research hotspot in antenna design due to their compact structure and high spectral efficiency. However, existing high- and low-frequency coaxial nested radiating elements still face numerous challenges in structural design, assembly processes, and automated production.

[0003] Taking a traditional high- and low-frequency coaxial nested radiating element as an example, such as the structure disclosed in patent CN218385759U, its design aims to integrate high and low frequency bands through nesting. Specifically, this structure sets a high-frequency vibrator mounting post at the center of the low-frequency vibrator base. This mounting post stands vertically on the low-frequency vibrator base and is hollow along its axis, thus forming a mounting channel that runs through its axis. This design aims to provide space for the installation of high-frequency components and attempts to improve the overall performance of the antenna through structural compactness.

[0004] Furthermore, a small high-frequency reflector is mounted on the high-frequency vibrator mounting post, and the high-frequency vibrator is fixed on top of the small high-frequency reflector. This layout allows the high-frequency vibrator to be suspended above the front of the antenna base plate, thereby optimizing the antenna's radiation characteristics to some extent. However, this design also brings a series of problems. Because the high-frequency vibrator needs to pass through the antenna base plate via a long coaxial cable and then be connected to the phase shifter on the back of the base plate via terminals, this not only increases signal transmission loss but also makes the entire structure relatively complex and fragile.

[0005] Specifically, the introduction of long coaxial cables not only increases the difficulty and time required for assembly, but also significantly compromises the mechanical stability of the entire structure due to the cable's flexibility and fragility. During antenna operation, even minor vibrations or external impacts can cause the cable to loosen or be damaged, thus affecting antenna performance. Furthermore, the complexity of the assembly process significantly increases the difficulty of automating antenna production. Under existing manufacturing processes, it is difficult to achieve efficient and precise automated assembly, thereby limiting the large-scale production and application of antennas. Utility Model Content

[0006] The primary objective of this invention is to solve at least one of the aforementioned problems by providing a radiating component and antenna.

[0007] To achieve the various objectives of this utility model, the following technical solution is adopted:

[0008] To achieve one of the objectives of this utility model, a radiating component is provided, comprising a low-frequency vibrator and a high-frequency vibrator. The low-frequency vibrator has an installation space, and an installation platform is provided within the installation space. A through installation channel is formed in the installation platform. The high-frequency vibrator is embedded in the installation space. The high-frequency vibrator includes a high-frequency radiating arm, a support member, and a feed core. The high-frequency radiating arm is connected to the support member, and the support member extends through the installation channel. A through feed channel is provided in the support member, and the feed core passes through the feed channel to feed power to the high-frequency radiating arm.

[0009] In one embodiment, the support includes a balun and a support column. One end of the balun is connected to a corresponding high-frequency radiating arm, and the other end is connected to the support column. A balun channel is formed in the balun, and a support channel is formed in the support column. The balun channel and the support channel are connected to form the power supply channel.

[0010] In one embodiment, the support column passes through the mounting channel, and the end of the support column not connected to the balun protrudes beyond the low-frequency oscillator.

[0011] In one embodiment, an air medium is formed in the support channel.

[0012] In one embodiment, the length of the support channel is greater than one-eighth of the wavelength of the high-frequency oscillator's operating frequency band.

[0013] In one embodiment, the radiation component further includes a high-frequency reflector plate, which is mounted on the mounting platform and has clearance holes corresponding to the support member.

[0014] In one embodiment, the high-frequency radiation arm has a cantilever at one end away from the polarization center along the polarization axis.

[0015] In one embodiment, the low-frequency oscillator includes a base and multiple pairs of low-frequency radiating arms, the multiple pairs of low-frequency radiating arms are disposed on the base, the multiple pairs of low-frequency radiating arms and the base surround to form the installation space, and the mounting platform is disposed on the base.

[0016] In one embodiment, the radiating component further includes a low-frequency reflector, the low-frequency vibrator is mounted on the reflector, and the reflector has clearance holes corresponding to the support member.

[0017] An antenna is provided to meet one of the purposes of this utility model, comprising a low-frequency reflector and a plurality of radiating components as described in any one of the preceding purposes, wherein the plurality of radiating components are disposed on the same low-frequency reflector and are arranged in an array.

[0018] Compared with the prior art, this utility model has many advantages, including but not limited to:

[0019] Firstly, in this invention, the high-frequency vibrator of the radiating component is embedded within the mounting space of the low-frequency vibrator, and a support member extends through the mounting channel. A through-feed channel is provided in the support member, through which the feed core passes to the outside of the low-frequency vibrator for electrical connection with a coaxial cable. This avoids the electrical interference problems caused by inserting a coaxial cable into the low-frequency vibrator for electrical connection with the high-frequency vibrator in existing technologies, thus optimizing the electrical performance of the radiating component and improving the feed efficiency and signal transmission stability of the high-frequency vibrator. Furthermore, the feed channel in the support member provides excellent electrical insulation and protection for the feed core, further reducing circuit losses and improving the transmission efficiency of the high-frequency vibrator, thereby enhancing the overall radiation performance of the radiating component.

[0020] Secondly, the radiating component forms an installation space in the low-frequency vibrator and sets up an installation platform in the installation space. A through installation channel is formed in the installation platform, and the support of the high-frequency vibrator passes through the installation channel, so that the high-frequency vibrator can be stably installed inside the low-frequency vibrator. This makes the structure of the radiating component more stable and less prone to loosening due to vibration, collision or other factors, thereby improving the overall reliability and performance of the antenna.

[0021] Furthermore, the radiating component has a simple and reasonable structure and a convenient assembly process, which can effectively reduce production costs. It simplifies the assembly process, reduces manual operation time and error rates, improves production efficiency, and thus lowers manufacturing costs. Attached Figure Description

[0022] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, in which:

[0023] Figure 1 This is a schematic diagram of the structure of the radiation component in a typical embodiment of the present invention.

[0024] Figure 2 This is a schematic diagram of the assembly of the radiation component according to a typical embodiment of the present invention.

[0025] Figure 3 This is a schematic diagram of the structure of the low-frequency oscillator of the radiation component in a typical embodiment of this utility model.

[0026] Figure 4This is a schematic diagram of the structure of the high-frequency oscillator of the radiation component in a typical embodiment of this utility model.

[0027] Figure 5 This is a schematic diagram from a first-view perspective of the assembly of a high-frequency vibrator and a high-frequency reflector in a typical embodiment of the present invention.

[0028] Figure 6 This is a schematic diagram from a second perspective showing the assembly of a high-frequency vibrator and a high-frequency reflector in a typical embodiment of the present invention.

[0029] Figure 7 This is a schematic diagram of the structure of the high-frequency oscillator of the radiation component according to another embodiment of the present invention. Detailed Implementation

[0030] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model and should not be construed as limiting this utility model.

[0031] Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms “a,” “an,” “the,” and “the” used herein may also include the plural forms. It should be further understood that the term “comprising” as used in this specification means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, and / or components, nor does it exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It should be understood that when we say an element is “connected” or “coupled” to another element, it can be directly connected or coupled to the other element, or there may be intermediate elements. Furthermore, “connected” or “coupled” as used herein can include wireless connections or wireless coupling. The term “and / or” as used herein includes all or any units and all combinations of one or more associated listed items.

[0032] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless specifically defined as herein.

[0033] This utility model provides a radiating component in which a high-frequency vibrator is nested within a low-frequency vibrator. The feed core of the high-frequency vibrator extends out of the low-frequency vibrator and is electrically connected to a coaxial cable to avoid extending the coaxial cable into the low-frequency vibrator and connecting it to the feed core. The feed core is installed in the feed channel to avoid electrical interference between the feed core and the low-frequency vibrator.

[0034] In a typical embodiment of this utility model, combined with Figure 1 and Figure 2 The radiation component 10 includes a high-frequency oscillator 100 and a low-frequency oscillator 200, with the high-frequency oscillator 100 nested within the low-frequency oscillator 200.

[0035] Combination Figure 3 The low-frequency oscillator 200 includes a base 210, multiple pairs of radiating arms 220 (referred to as low-frequency radiating arms 220), and multiple baluns 230 (referred to as low-frequency baluns 230). The multiple pairs of low-frequency radiating arms 220 are located above the base 210 and are arranged along the same annular path, forming a ring structure. Each pair of low-frequency radiating arms 220 is equipped with a low-frequency balun 230. One end of the low-frequency balun 230 is connected to the base 210, and the other end is connected to the corresponding pair of low-frequency radiating arms 220. That is, the low-frequency radiating arms 220 are supported on the base 210 by the low-frequency baluns 230. In this embodiment, the base 210, the multiple pairs of low-frequency radiating arms 220, and the multiple baluns together form an installation space 240.

[0036] The installation space 240 includes a mounting platform 250, which sits on the base 210 and extends along its height, protruding towards the low-frequency radiating arm 220. The mounting platform 250 has a mounting channel 251 that extends along its height and penetrates the mounting platform 250, making it a through-hole structure. In one embodiment, the mounting platform 250 and the base 210 are integrally formed. In a further embodiment, the mounting platform 250 and the low-frequency vibrator 200 are integrally formed from sheet metal to improve production efficiency.

[0037] Combination Figure 4 The high-frequency oscillator 100 includes a radiating arm 110 (referred to as the high-frequency radiating arm 110), a support member 120, and a power supply core 130. The support member 120 is used to support the high-frequency radiating arm 110, and the power supply core 130 is used to power the corresponding high-frequency radiating arm 110.

[0038] In this embodiment, the high-frequency oscillator 100 is a dual-polarized oscillator as an example to describe the present invention, but it should not be construed as a limitation of the present invention. The high-frequency oscillator 100 includes two pairs of high-frequency radiating arms 110 with orthogonal polarization, and each pair of high-frequency radiating arms 110 is equipped with a support member 120 and a feed core 130.

[0039] Combination Figure 1 and Figure 2 The high-frequency radiating arm 110 is disposed within the mounting space 240, and the high-frequency radiating arm 110 is positioned above the mounting platform 250 along the height direction. The support member 120 extends along the height direction from outside the low-frequency vibrator 200 through the mounting channel 251 to enter the mounting space 240. One end of the support member 120 entering the mounting space 240 is connected to the corresponding high-frequency radiating arm 110 to support the high-frequency radiating arm 110.

[0040] A power supply channel is provided in the support member 120. The power supply channel is arranged along the height direction and penetrates the support member 120, that is, the power supply channel is a through-hole structure. The power supply core 130 extends from outside the low-frequency vibrator 200, passes through the power supply channel, and enters the installation space 240, combined with... Figure 4 One end of the feed core 130 that enters the mounting space 240 (referred to as the feed section 131) is electrically connected to a corresponding pair of high-frequency radiating arms 110, and feeds the corresponding pair of high-frequency radiating arms 110. In this embodiment, the feed section 131 is coupled to the corresponding pair of high-frequency radiating arms 110 for power supply.

[0041] In this embodiment, the power supply core 130 extends beyond the low-frequency vibrator 200 via the power supply channel, allowing the power supply core 130 to be electrically connected to the coaxial cable outside the low-frequency vibrator 200 without having to introduce the coaxial cable into the installation space 240 of the low-frequency vibrator 200. This optimizes the electrical performance of the radiating component 10, makes the structure of the radiating component 10 more robust, simplifies assembly, improves intermodulation stability, and reduces production costs.

[0042] In a typical embodiment of this utility model, combined with Figure 4 The support member 120 includes a balun 122 (referred to as a high-frequency balun 122) and a support column 123. One end of the high-frequency balun 122 is connected to a corresponding high-frequency radiation arm 110, and the other end is connected to a corresponding support column 123. In conjunction with... Figure 1 and Figure 2The high-frequency balun 122 is disposed within the installation space 240 and is located on the mounting platform 250; the support column 123 passes through the installation channel 251 of the mounting platform 250, and one end of the support column 123 extends through the installation channel 251 to the outside of the low-frequency vibrator 200.

[0043] Combination Figure 4 The high-frequency balun 122 has a through balun channel 1221, combined with Figure 6 The support column 123 has a through support channel 1231. The high-frequency balun 122 is connected to the support column 123, so that the balun channel 1221 and the support channel 1231 are connected to each other to form the power supply channel. It can be understood that the power supply core 130 passes through the balun channel 1221 and the support channel 1231 in sequence within the installation space 240 and extends beyond the low-frequency oscillator 200.

[0044] In this embodiment, the support channel 1231 is filled with air. Compared to the method of introducing a coaxial cable into the mounting space 240 of the low-frequency vibrator 200 and then electrically connecting it to the feed core 130, the feed core 130 extends through the support channel 1231 to the outside of the low-frequency vibrator 200, which can significantly reduce circuit loss, improve the transmission efficiency of the high-frequency vibrator 100, and thus improve the overall radiation performance of the radiating component 10. In this embodiment, it is recommended that the length of the support channel 1231 be greater than one-eighth of the wavelength of the operating frequency band of the high-frequency vibrator 100.

[0045] Combination Figure 4 The high-frequency balun 122 of the support member 120 is used to support one of the pair of high-frequency radiating arms 110 (referred to as the first high-frequency radiating arm 111), while the other high-frequency radiating arm 112 (referred to as the second high-frequency radiating arm 112) is separately equipped with another balun (referred to as the support balun 140). That is to say, each high-frequency radiating arm 110 is equipped with a balun to maintain the structural stability of the high-frequency oscillator 100 by providing good support for the corresponding high-frequency radiating arm 110. The support balun 140 is also provided with a balun hole. The feed core 130 extends from the balun channel 1221 of the high-frequency balun 122 and then enters the balun hole of the support balun 140, so that the feed core 130 simultaneously feeds the first high-frequency radiating arm 111 and the second high-frequency radiating arm 112, which are operating in the same polarization. In another embodiment, the high-frequency balun 122 of the support 120 can simultaneously support a pair of high-frequency radiating arms 110.

[0046] In a typical embodiment of this utility model, combined with Figure 1 , Figure 2 , Figure 3 and Figure 5 The radiating component 10 also includes a reflector (referred to as high-frequency reflector 150) for the high-frequency vibrator 100. The high-frequency reflector 150 is installed in the mounting space 240 of the low-frequency vibrator 200, and is positioned on the top surface 252 of the mounting platform 250 in the height direction, and is fixedly mounted on the top surface 252 of the mounting platform 250. The high-frequency balun 122 and the supporting balun 140 are both fixedly mounted on the high-frequency reflector 150, ensuring that the high-frequency vibrator 100 can be stably positioned in the mounting space 240 of the low-frequency vibrator 200, thereby improving the structural stability of the radiating component 10.

[0047] In this embodiment, it is recommended that the high-frequency reflector 150 be threadedly connected to the mounting platform 250 by screws or bolts, and that the screws or bolts be made of a dielectric material, but this should not be construed as a limitation of the present invention. Additionally, it is recommended that both the high-frequency balun 122 and the supporting balun 140 be threadedly connected to the high-frequency reflector 150 by screws or bolts, and that the screws or bolts be made of a dielectric material, but this should not be construed as a limitation of the present invention.

[0048] Combination Figure 2 The high-frequency reflector 150 has a through hole (referred to as the first clearance hole 151), and the support member 120 passes through the first clearance hole 151. Specifically, the high-frequency balun 122 corresponding to the first radiating arm and the support balun 140 corresponding to the second high-frequency radiating arm 112 are both located above the high-frequency reflector 150, and the support column 123 passes through the first clearance hole 151 to connect with the corresponding high-frequency balun 122.

[0049] The radiating component 10 also provides a reflector (referred to as a low-frequency reflector, not shown) for the low-frequency vibrator 200, with the low-frequency vibrator 200 situated on the low-frequency reflector. The high-frequency vibrator 100 is situated on the high-frequency reflector 150, and the low-frequency vibrator 200 is situated on the low-frequency reflector, ensuring that the high-frequency vibrator 100 and the low-frequency vibrator 200 do not share the same reflector. This effectively reduces the coupling between the high-frequency vibrator 100 and the low-frequency vibrator 200, improving high- and low-frequency radiation performance and the isolation between high and low frequencies.

[0050] The low-frequency radiating plate has a through hole (referred to as the second clearance hole). The support member 120 passes through the mounting channel 251 and the second clearance hole in sequence to extend to the bottom of the low-frequency radiating plate, so that the feed core 130 of the high-frequency vibrator 100 can also extend to the bottom of the low-frequency radiating plate through the feed channel of the support member 120, so that the feed core 130 can be electrically connected to an external coaxial cable.

[0051] In one embodiment, combined Figure 7 The high-frequency radiating arm 110 of the high-frequency oscillator 100 is further provided with a cantilever 160, which is disposed at one end of the high-frequency radiating arm 110, located along the polarization axis of the high-frequency radiating arm 110 and away from the polarization center of the high-frequency oscillator 100. By providing the cantilever 160 on the high-frequency radiating arm 110, the effective electrical length of the high-frequency oscillator 100 can be effectively extended, the bandwidth can be expanded, and the radiation performance of the radiation component 10 can be optimized.

[0052] This utility model also provides an antenna, which includes the radiating components 10 described above. The plurality of radiating components 10 share the same low-frequency reflector, and the plurality of radiating components 10 are arranged in an array so that a high-frequency array and a low-frequency array are formed on the antenna.

[0053] In one embodiment, the radiating component 10 is disposed on the front side of the low-frequency reflector, and a phase shifter is disposed on the back side of the low-frequency reflector. The feed core 130 of the high-frequency vibrator 100 can pass through the low-frequency reflector and be electrically connected to the phase shifter, so as to shorten the length of the electrical transmission path between the high-frequency vibrator 100 and the phase shifter and improve the radiation performance of the antenna.

[0054] In summary, the radiating assembly of this utility model nests a high-frequency vibrator within a low-frequency vibrator and provides a support member extending to the outside of the low-frequency vibrator. This allows the feed core of the high-frequency vibrator to be installed in the feed channel of the support member, thus extending to the outside of the low-frequency vibrator. This enables the feed core to be easily electrically connected to a coaxial cable without needing to introduce the coaxial cable into the low-frequency vibrator, thereby improving the electrical performance, structural stability, and ease of assembly of the radiating assembly, while reducing production costs.

[0055] The above description is merely a preferred embodiment of this utility model and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of this utility model is not limited to the specific combination of the above-described technical features, but also includes other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above-described features with (but not limited to) technical features of this utility model that have similar functions.

[0056] Although the subject matter has been described using language specific to structural features and / or methodological logic, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or actions described above. Rather, the specific features and actions described above are merely illustrative examples of implementing the claims.

Claims

1. A radiating component, characterized in that, The device includes a low-frequency oscillator and a high-frequency oscillator. The low-frequency oscillator has an installation space, and an installation platform is provided within the installation space. A through installation channel is formed in the installation platform. The high-frequency oscillator is embedded in the installation space. The high-frequency oscillator includes a high-frequency radiating arm, a support member, and a feed core. The high-frequency radiating arm is connected to the support member, and the support member extends through the installation channel. A through feed channel is provided in the support member, and the feed core passes through the feed channel to feed power to the high-frequency radiating arm.

2. The radiating component as described in claim 1, characterized in that, The support includes a balun and a support column. One end of the balun is connected to a corresponding high-frequency radiation arm, and the other end is connected to the support column. A balun channel is formed in the balun, and a support channel is formed in the support column. The balun channel and the support channel are connected to form the power supply channel.

3. The radiating component as described in claim 2, characterized in that, The support column passes through the installation channel, and the end of the support column that is not connected to the balun protrudes beyond the low-frequency vibrator.

4. The radiating component as described in claim 2 or 3, characterized in that, An air medium is formed in the support channel.

5. The radiating component as described in claim 2 or 3, characterized in that, The length of the support channel is greater than one-eighth of the wavelength of the high-frequency oscillator's operating frequency band.

6. The radiating component as claimed in claim 1, characterized in that, The radiation component also includes a high-frequency reflector plate, which is mounted on the mounting platform and has clearance holes corresponding to the support member.

7. The radiating component as claimed in claim 1, characterized in that, The high-frequency radiation arm has a cantilever at the end away from the polarization center along the polarization axis.

8. The radiating component as claimed in claim 1, characterized in that, The low-frequency oscillator includes a base and multiple pairs of low-frequency radiating arms. The multiple pairs of low-frequency radiating arms are disposed on the base, and the multiple pairs of low-frequency radiating arms and the base enclose the installation space. The mounting platform is disposed on the base.

9. The radiating component as described in claim 8, characterized in that, The radiation component also includes a low-frequency reflector, the low-frequency vibrator is mounted on the reflector, and the reflector is provided with clearance holes corresponding to the support member.

10. An antenna, characterized in that, It includes a low-frequency reflector and a plurality of radiating components as described in any one of claims 1 to 9, wherein the plurality of radiating components are disposed on the same low-frequency reflector and are arranged in an array.