Multi-frequency antenna and its radiation structure

Abstract

The present invention discloses a multi-frequency antenna and its radiation structure, the radiation structure includes: a low-frequency radiation unit, the low-frequency radiation unit includes four groups of first radiators, each group of the first radiators includes two radiation arms arranged at an angle; a high-frequency radiation unit, the high-frequency radiation unit is four, and the four high-frequency radiation units are arranged one-to-one between two radiation arms of a group of the first radiators; and an auxiliary coupling element, the auxiliary coupling element is four, the four auxiliary coupling elements are arranged one-to-one above the four high-frequency radiation units, and the auxiliary coupling element is electromagnetically coupled with the correspondingly arranged radiation arms. The radiation structure can improve the radiation aperture of the low-frequency radiation unit, and the radiation efficiency is high; thus, the radiation index of the multi-frequency antenna using the radiation structure is excellent.

Description

Technical Field

[0001] The present invention relates to the field of communication technology, and in particular to a multi-frequency antenna and a radiation structure thereof. Background Art

[0002] With the rapid development of wireless communication technology, multi-frequency antennas have become a development trend. In order to meet the needs of each operator or multiple operators, multiple frequency bands need to be integrated into one antenna. In order to meet the needs of miniaturization and high performance of multi-frequency antennas, the low-frequency radiating unit in the multi-frequency antenna usually includes four pairs of radiators and two feeding plates, each pair of the radiators includes two radiating arms, the two radiating arms in each radiator are perpendicular to each other, and the two adjacent radiating arms of two adjacent radiators are arranged in parallel; the two feeding plates feed the four pairs of radiators accordingly. In order to reduce the impact on the high-frequency band indicators of the multi-frequency antenna, the four groups of radiators of the low-frequency radiating unit are linear structures, resulting in an open structure of the radiating arms of the low-frequency radiating unit, a small effective aperture, and low radiation efficiency. Summary of the invention

[0003] Based on this, a multi-frequency antenna and a radiation structure thereof are proposed. The radiation structure can improve the radiation aperture of the low-frequency radiation unit and has high radiation efficiency. Thus, the radiation index of the multi-frequency antenna using the radiation structure is excellent.

[0004] The technical solution is as follows:

[0005] On the one hand, a radiation structure is provided, including: a low-frequency radiation unit, the low-frequency radiation unit including four groups of first radiators, each group of the first radiators including two radiation arms arranged at an angle; a high-frequency radiation unit, the number of the four high-frequency radiation units being respectively arranged between two radiation arms of a group of the first radiators; and an auxiliary coupling element, the number of the four auxiliary coupling elements being respectively arranged above the four high-frequency radiation units, and the auxiliary coupling element being electromagnetically coupled to the correspondingly arranged radiation arms.

[0006] In the radiation structure of the above-mentioned embodiment, each group of the first radiator of the low-frequency radiation unit includes two radiation arms arranged at an angle. The four high-frequency radiation units are arranged one by one between the two radiation arms of the first radiator of each group, that is, a high-frequency radiation unit is correspondingly arranged between the two radiation arms arranged at an angle of each group of the first radiator. An auxiliary coupling element is arranged above each high-frequency radiation unit, so that the auxiliary coupling element is electromagnetically coupled with the corresponding two radiation arms. By using the auxiliary coupling element to be electromagnetically coupled with the two radiation arms of a group of first radiators, the open structure design of the radiation arm of the low-frequency radiation unit can be realized to suppress the influence of the low-frequency radiation unit on the performance of the high-frequency radiation unit; and the radiation aperture and design bandwidth of the low-frequency radiation unit can be improved, and the gain and beam convergence can also be improved, and the radiation efficiency is high. At the same time, the auxiliary coupling element has a certain parasitic effect on the high-frequency radiation unit, which can improve the radiation index of the high-frequency radiation unit and improve the bandwidth design.

[0007] The technical solution is further described below:

[0008] In one embodiment, the auxiliary coupling element is configured as a square closed structure having a first through hole, and the side length of the square closed structure is greater than 0.5λ1 and less than 0.8λ1, wherein λ1 is the wavelength corresponding to the center frequency of the working frequency band of the high-frequency radiation unit.

[0009] In one of the embodiments, the auxiliary coupling element is configured as a circular ring structure, and the outer diameter of the circular ring structure is greater than 0.5λ1 and less than 0.8λ1, wherein λ1 is the wavelength corresponding to the center frequency of the working frequency band of the high-frequency radiation unit.

[0010] In one of the embodiments, the radiation structure further includes a non-metallic dielectric substrate, the dielectric substrate is provided with a second through hole corresponding to the high-frequency radiation unit, and the auxiliary coupling element is arranged on the dielectric substrate.

[0011] In one of the embodiments, the radiation structure further includes a support member for supporting the auxiliary coupling element, and the support member is made of insulating material.

[0012] In one embodiment, the support member includes a telescopic column, one end of the telescopic column is fixed on the reflective plate, and the other end of the telescopic column is connected to the auxiliary coupling element.

[0013] In one of the embodiments, the distance between the auxiliary coupling element and the reflector is greater than 0.5λ1 and less than 0.75λ1, wherein λ1 is the wavelength corresponding to the center frequency of the working frequency band of the high-frequency radiation unit.

[0014] In one embodiment, the radiation structure also includes a parasitic loader, which is connected to the second radiator of the high-frequency radiation unit, and the distance between the parasitic loader and the second radiator is 0.125λ1~0.25λ1, wherein λ1 is the wavelength corresponding to the center frequency of the working frequency band of the high-frequency radiation unit.

[0015] On the other hand, a multi-frequency antenna is provided, including a reflector and the radiation structure, wherein the low-frequency radiation unit and the high-frequency radiation unit are both connected to the reflector.

[0016] In the multi-frequency antenna of the above-mentioned embodiment, each group of the first radiator of the low-frequency radiating unit includes two radiating arms arranged at an angle. The four high-frequency radiating units are arranged one by one between the two radiating arms of the first radiator of each group, that is, a high-frequency radiating unit is correspondingly arranged between the two radiating arms arranged at an angle of each group of the first radiator. An auxiliary coupling element is arranged above each high-frequency radiating unit, so that the auxiliary coupling element is electromagnetically coupled with the corresponding two radiating arms. By using the auxiliary coupling element to be electromagnetically coupled with the two radiating arms of a group of first radiators, the open structure design of the low-frequency radiating unit can be realized to suppress the influence of the low-frequency radiating unit on the performance of the high-frequency radiating unit; and the radiation aperture and design bandwidth of the low-frequency radiating unit can be improved, and the gain and beam convergence can be improved, and the radiation efficiency is high. At the same time, the projection area of ​​the radiating arm of the low-frequency radiating unit on the reflector can be minimized, and the multi-frequency antenna structure can be made compact and the size of the multi-frequency antenna can be reduced.

[0017] In one embodiment, there are at least two radiation structures, and the low-frequency radiation unit, the high-frequency radiation unit and the auxiliary coupling element are all arranged in an array.

[0018] In one embodiment, the distance between two adjacent low-frequency radiation units is twice the distance between two adjacent high-frequency radiation units. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of a multi-frequency antenna according to an embodiment;

[0020] Figure 2 for Figure 1 A top view of a multi-frequency antenna;

[0021] Figure 3 for Figure 1 A diagram showing the coordination between the high frequency radiation unit and the auxiliary coupling element of the multi-frequency antenna;

[0022] Figure 4 for Figure 1 A schematic diagram of the structure of a low-frequency radiation unit of a multi-frequency antenna;

[0023] Figure 5 A top view of a multi-frequency antenna according to another embodiment;

[0024] Figure 6 for Figure 5 A diagram showing the coordination between the high frequency radiation unit and the auxiliary coupling element of the multi-frequency antenna;

[0025] Figure 7 A top view of a multi-frequency antenna according to yet another embodiment;

[0026] Figure 8 for Figure 7 Diagram of the coordination between the high-frequency radiation unit and the auxiliary coupling element of the multi-frequency antenna.

[0027] Description of reference numerals:

[0028] 10. Multi-frequency antenna, 100. Low-frequency radiation unit, 110. First radiator, 111. Radiation arm, 120. First balun seat, 200. High-frequency radiation unit, 210. Second radiator, 220. Second balun seat, 230. Parasitic loader, 300. Auxiliary coupling element, 310. Coupling block, 311. First through hole, 320. Coupling ring, 330. Coupling substrate, 331. Second through hole, 400. Support member, 500. Reflection plate. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described herein are only used to explain the present invention and do not limit the scope of protection of the present invention.

[0030] It should be noted that when an element is referred to as being "disposed on" or "fixed on" another element, it may be directly on the other element or there may be a central element. When an element is referred to as being "fixed on" another element, or being "fixedly connected" to another element, they may be fixed in a detachable manner or in a non-detachable manner. When an element is considered to be "connected" or "rotatably connected" to another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right", "upper", "lower" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to restrict the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0032] The terms "first", "second", "third" and the like in the present invention do not represent specific quantities and orders, but are merely used to distinguish names.

[0033] It should also be understood that when interpreting an element, even if not explicitly described, the element is interpreted as including a range of error, which should be within the acceptable deviation range of the specific value determined by those skilled in the art. For example, "approximately", "approximately" or "substantially" can mean within one or more standard deviations, which are not limited here.

[0034] like Figures 1 to 4 As shown, in one embodiment, a radiation structure is provided, including a low-frequency radiation unit 100, a high-frequency radiation unit 200 and an auxiliary coupling element 300. The low-frequency radiation unit 100 includes four groups of first radiation bodies 110, each group of first radiation bodies 110 includes two radiation arms 111 arranged at an angle; there are four high-frequency radiation units 200, and the four high-frequency radiation units 200 are arranged one-to-one between the two radiation arms 111 of a group of first radiation bodies 110; there are four auxiliary coupling elements 300, and the four auxiliary coupling elements 300 are arranged one-to-one above the four high-frequency radiation units 200, and the auxiliary coupling elements 300 are electromagnetically coupled with the correspondingly arranged radiation arms 111.

[0035] In the radiation structure of the above embodiment, the four groups of first radiators 110 of the low-frequency radiation unit 100 are arranged on the reflection plate 500 through the first balun seat 120, and the four groups of first radiators 110 are fed by the first feeding assembly (not shown). Each group of first radiators 110 includes two radiating arms 111 arranged at an angle. Four high-frequency radiation units 200 are arranged one by one between the two radiating arms 111 of each group of first radiators 110, that is, one high-frequency radiation unit 200 is correspondingly arranged between the two radiating arms 111 arranged at an angle of each group of first radiators 110. An auxiliary coupling element 300 is arranged above each high-frequency radiation unit 200, so that the auxiliary coupling element 300 is electromagnetically coupled with the corresponding two radiating arms 111. By utilizing the electromagnetic coupling between the auxiliary coupling element 300 and the two radiating arms 111 of a group of first radiators 110, the open structure design of the radiating arm 111 of the low-frequency radiating unit 100 can be realized to suppress the influence of the low-frequency radiating unit 100 on the performance of the high-frequency radiating unit 200; and the radiation aperture and design bandwidth of the low-frequency radiating unit 100 can be improved, and the gain and beam convergence can also be improved, and the radiation efficiency is high. At the same time, the auxiliary coupling element 300 has a certain parasitic effect on the high-frequency radiating unit 200, which can improve the radiation index of the high-frequency radiating unit 200 and improve the bandwidth design.

[0036] It should be noted that the first balun seat 120 can be fixed on the reflector 500 by riveting or clamping. The high-frequency radiation unit 200 can be an existing structure. For example, the high-frequency radiation unit 200 includes two groups of orthogonal polarization second radiators 210. The second balun seat 220 is used to support the second radiator 210 and is fixed on the reflector 500 by riveting or clamping. The second radiator 210 is fed by a second feeding assembly (not shown). The auxiliary coupling element 300 is electromagnetically coupled with the corresponding radiating arm 111, which means that an auxiliary coupling element 300 is correspondingly arranged in the area surrounded by the two radiating arms 111 of a group of first radiators 110, and the auxiliary coupling element 300 is electromagnetically coupled with the corresponding two radiating arms 111. The two radiating arms 111 in each group of first radiators 110 are preferably arranged approximately vertically or approximately in parallel, and preferably, in two adjacent groups of first radiators 110, the adjacent two radiating arms 111 are arranged in parallel or approximately in parallel, so that the radiating arms 111 of the low-frequency radiating unit 100 are in a "cross" shape, so that the open structure design of the radiating arms 111 of the low-frequency radiating unit 100 is more reasonable, so as to better suppress the influence of the low-frequency radiating unit 100 on the performance of the high-frequency radiating unit 200. Among them, the approximately vertical and approximately parallel are considered to be vertical or parallel within the allowable error range. For example, when the angle between the two radiating arms 111 is 89° to 91°, the two radiating arms 111 can be considered to be vertically arranged, and when the angle between the two radiating arms 111 is 0° to 1°, the two radiating arms 111 can be considered to be parallelly arranged. The auxiliary coupling element 300 can be made of metal and formed by sheet metal stamping, which is convenient for processing.

[0037] The contour shape of the auxiliary coupling element 300 can be flexibly selected according to actual use requirements, as long as it can be electromagnetically coupled with the corresponding radiation arm 111 and does not affect the radiation performance of the high-frequency radiation unit 200.

[0038] like Figure 2 and Figure 3As shown, in one embodiment, the auxiliary coupling element 300 is configured as a square closed structure 310 provided with a first through hole 311. The side length of the square closed structure 310 is greater than 0.5λ1 and less than 0.8λ1, wherein λ1 is the wavelength corresponding to the central frequency point of the working frequency band of the high-frequency radiation unit 200. In this way, the square closed structure 310 with the first through hole 311 can be enclosed by a metal strip with a width less than 10mm, which will not affect the radiation performance of the high-frequency radiation unit 200 below. In addition, there is a proportional relationship between the side length of the square closed structure 310 and the wavelength corresponding to the central frequency point of the working frequency band of the high-frequency radiation unit 200, which also ensures that the low-frequency radiation unit 100 can achieve a broadband design; at the same time, the spacing between the array composed of the high-frequency radiation unit 200 and the array composed of the low-frequency radiation unit 100 will not be increased, and the antenna size will be reduced. The square closed structure 310 can be a square, a rectangle, a pentagon, etc., and the length of each side of the square closed structure 310 is greater than 0.5λ1 and less than 0.8λ1. The metal strip may be an existing strip line, strip bar or other element.

[0039] like Figure 5 and Figure 6 As shown, in one embodiment, the auxiliary coupling element 300 is configured as a circular ring structure 320, and the outer diameter of the circular ring structure 320 (eg Figure 6 As shown in D), it is greater than 0.5λ1 and less than 0.8λ1, where λ1 is the wavelength corresponding to the center frequency of the working frequency band of the high-frequency radiation unit 200. In this way, the circular ring structure 320 is easy to process and can be formed by stamping of sheet metal. And there is a proportional relationship between the outer diameter of the circular ring structure 320 and the wavelength corresponding to the center frequency of the working frequency band of the high-frequency radiation unit 200, which ensures that the circular ring structure 320 will not affect the radiation performance of the high-frequency radiation unit 200 and ensures that the low-frequency radiation unit 100 can achieve a broadband design; at the same time, it will not increase the spacing between the array composed of the high-frequency radiation unit 200 and the array composed of the low-frequency radiation unit 100, thereby reducing the size of the antenna. The circular ring structure 320 can also be enclosed by a metal strip with a width of less than 10 mm.

[0040] like Figure 7 and Figure 8As shown, in one embodiment, the radiation structure also includes a dielectric substrate 330 made of non-metallic material, the dielectric substrate 330 is provided with a second through hole 331 corresponding to the high-frequency radiation unit 200, and the auxiliary coupling element 300 is arranged on the dielectric substrate 330. In this way, the second through hole 331 makes the dielectric substrate 330 not affect the radiation performance of the high-frequency radiation unit 200. The directional closure structure 310 or the circular ring structure 320 can be arranged around the circumference of the second through hole 331, and can also ensure that the auxiliary coupling element 300 and the corresponding radiation arm 111 achieve good electromagnetic coupling correlation, and ensure that the low-frequency radiation unit 100 can achieve a wide-band design. Among them, the dielectric substrate 330 can be a PCB (Printed Circuit Board) board.

[0041] The sizes of the first through hole 311 and the second through hole 331 and the size of the annular structure 320 can be flexibly adjusted according to the size of the second radiator 210 of the high-frequency radiation unit 200 , as long as they do not affect the radiation performance of the high-frequency radiation unit 200 .

[0042] like Figure 1 Figure 3 , Figure 6 and Figure 8 As shown, based on any of the above embodiments, the radiation structure further includes a support member 400 for supporting the auxiliary coupling element 300, and the support member 400 is made of insulating material. In this way, the support member 400 is fixed on the reflector 500 by riveting or clamping, so that the auxiliary coupling element 300 is stably fixed on the reflector 500 and the auxiliary coupling element 300 is spaced from the reflector 500, so that the support is stable and the connection is reliable. The support member 400 can be made of insulating materials such as plastic.

[0043] The support member 400 can be configured in a columnar, strip, or other shape, as long as it can support the auxiliary coupling element 300 .

[0044] In one embodiment, the support member 400 includes a telescopic column (not shown), one end of which is fixed to the reflector 500 by riveting or clamping, and the other end of which is connected to the auxiliary coupling element 300 by clamping. In this way, the distance between the auxiliary coupling element 300 and the reflector 500 can be flexibly adjusted according to actual use needs, and the use needs of high-frequency radiation units 200 and low-frequency radiation units 100 of different heights can be met, ensuring that the broadband design of the low-frequency radiation unit 100 can be realized, and the radiation performance of the high-frequency radiation unit 200 will not be affected.

[0045] Based on any of the above embodiments, the distance between the auxiliary coupling element 300 and the reflector 500 (eg Figure 1H) is greater than 0.5λ1 and less than 0.75λ1, where λ1 is the wavelength corresponding to the center frequency of the working frequency band of the high-frequency radiation unit 200. In this way, it is ensured that the auxiliary coupling element 300 can achieve electromagnetic coupling with the radiation arm 111 of the low-frequency radiation unit 100, thereby ensuring the broadband design of the low-frequency radiation unit 100 and preventing the low-frequency radiation unit 100 from affecting the radiation performance of the high-frequency radiation unit 200.

[0046] like Figure 2 , Figure 3 , Figures 5 to 8 As shown, on the basis of any of the above embodiments, the radiation structure also includes a parasitic loader 230. The parasitic loader 230 is connected to the second radiator 210 of the high-frequency radiation unit 200 by riveting or clamping. In this way, the use of the parasitic loader 230 can further improve the radiation performance of the high-frequency radiation unit 200 and improve the bandwidth of the high-frequency radiation unit 200. The distance between the parasitic loader 230 and the second radiator 210 is 0.125λ1~0.25λ1, wherein λ1 is the wavelength corresponding to the center frequency of the working frequency band of the high-frequency radiation unit 200. In this way, the parasitic loader 230 and the auxiliary coupling element 300 will not affect each other, thereby ensuring the reliability of the work.

[0047] like Figures 1 to 3 As shown, in one embodiment, a multi-frequency antenna 10 is also provided, including a reflector 500 and a radiation structure of any of the above embodiments, and the low-frequency radiation unit 100, the high-frequency radiation unit 200 and the auxiliary coupling element 300 are all connected to the reflector 500.

[0048] In the multi-frequency antenna 10 of the above embodiment, each group of the first radiator 110 of the low-frequency radiating unit 100 includes two radiating arms 111 arranged at an angle. Four high-frequency radiating units 200 are arranged one by one between the two radiating arms 111 of each group of the first radiator 110, that is, one high-frequency radiating unit 200 is correspondingly arranged between the two radiating arms 111 arranged at an angle of each group of the first radiator 110. An auxiliary coupling element 300 is arranged above each high-frequency radiating unit 200, so that the auxiliary coupling element 300 is electromagnetically coupled with the corresponding two radiating arms 111. By using the electromagnetic coupling between the auxiliary coupling element 300 and the two radiating arms 111 of a group of the first radiator 110, the open structure design of the radiating arm 111 of the low-frequency radiating unit 100 can be realized to suppress the low-frequency radiating unit 100 from affecting the performance of the high-frequency radiating unit 200; and the radiation aperture and design bandwidth of the low-frequency radiating unit 100 can be improved, and the gain and beam convergence can also be improved, and the radiation efficiency is high. At the same time, the projection area of ​​the radiation arm 111 of the low-frequency radiation unit 100 on the reflector 500 can be minimized, which can also make the multi-frequency antenna 10 compact and reduce the size of the multi-frequency antenna 10.

[0049] In one embodiment, there are at least two radiation structures, and the low-frequency radiation unit 100, the high-frequency radiation unit 200 and the auxiliary coupling element 300 are all arranged in an array. In this way, the low-frequency radiation units 100 on the antenna are arranged in an array, the high-frequency radiation units 200 are arranged in an array, and the auxiliary coupling elements 300 are also arranged in an array, so that the high-frequency radiation units 200 and the low-frequency radiation units 100 do not affect each other, ensuring the radiation performance of the multi-frequency antenna 10; it also makes the internal structure of the multi-frequency antenna 10 compact and reduces the size of the multi-frequency antenna 10.

[0050] Furthermore, the distance between two adjacent low-frequency radiation units 100 is twice the distance between two adjacent high-frequency radiation units 200. In this way, the distance between the array composed of high-frequency radiation units 200 and the array composed of low-frequency radiation units 100 can be minimized, making the internal structure of the multi-frequency antenna 10 more compact and reducing the size of the multi-frequency antenna 10.

[0051] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0052] The above embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as restrictions on the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A radiation structure, characterized in that: include: A low-frequency radiation unit, the low-frequency radiation unit comprising four groups of first radiation bodies, each group of the first radiation bodies comprising two radiation arms arranged at an angle, and in two adjacent groups of the first radiation bodies, two adjacent radiation arms are arranged in parallel or approximately in parallel, so that the radiation arms of the low-frequency radiation unit are in a cross shape; A high-frequency radiation unit, wherein there are four high-frequency radiation units, and the four high-frequency radiation units are arranged one by one between two radiation arms of a group of the first radiators; and Auxiliary coupling elements, the number of the auxiliary coupling elements being four, the four auxiliary coupling elements being arranged one by one above the four high-frequency radiation units, and the auxiliary coupling elements being electromagnetically coupled to the correspondingly arranged radiation arms; Wherein, the auxiliary coupling element is configured as a square closed structure with a first through hole, the side length of the square closed structure is greater than 0.5λ1 and less than 0.8λ1, λ1 is the wavelength corresponding to the central frequency point of the working frequency band of the high-frequency radiation unit; or, The auxiliary coupling element is configured as a circular ring structure, the outer diameter of which is greater than 0.5λ1 and less than 0.8λ1, where λ1 is the wavelength corresponding to the center frequency point of the working frequency band of the high-frequency radiation unit.

2. The radiation structure according to claim 1, characterized in that The length of each side of the square closed structure is greater than 0.5λ1 and less than 0.8λ1.

3. The radiation structure according to claim 1, characterized in that: The circular ring structure is surrounded by a metal belt with a width less than 10 mm.

4. The radiation structure according to claim 1, characterized in that: It also includes a non-metallic dielectric substrate, the dielectric substrate is provided with a second through hole corresponding to the high-frequency radiation unit, and the auxiliary coupling element is arranged on the dielectric substrate.

5. The radiation structure according to claim 1, characterized in that: It also includes a supporting member for supporting the auxiliary coupling element, and the supporting member is made of insulating material.

6. The radiation structure according to claim 5, characterized in that The support member comprises a telescopic column, one end of which is fixed on the reflective plate, and the other end of which is connected to the auxiliary coupling element.

7. The radiation structure according to any one of claims 1 to 6, characterized in that: The distance between the auxiliary coupling element and the reflector is greater than 0.5λ1 and less than 0.75λ1, wherein λ1 is the wavelength corresponding to the center frequency point of the working frequency band of the high-frequency radiation unit.

8. The radiation structure according to any one of claims 1 to 6, characterized in that: It also includes a parasitic loader, which is connected to the second radiator of the high-frequency radiation unit, and the distance between the parasitic loader and the second radiator is 0.125λ1~0.25λ1, wherein λ1 is the wavelength corresponding to the center frequency of the working frequency band of the high-frequency radiation unit.

9. A multi-frequency antenna, characterized in that: It comprises a reflection plate and the radiation structure according to any one of claims 1 to 8, wherein the low-frequency radiation unit and the high-frequency radiation unit are both connected to the reflection plate.

10. The multi-frequency antenna according to claim 9, characterized in that: There are at least two radiation structures, and the low-frequency radiation unit, the high-frequency radiation unit and the auxiliary coupling element are all arranged in an array.

11. The multi-frequency antenna according to claim 10, characterized in that: The distance between two adjacent low-frequency radiation units is twice the distance between two adjacent high-frequency radiation units.

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