Reflection device for base station antenna and base station antenna

Abstract

The invention provides a reflection device and a corresponding base station antenna, and the reflection device comprises a bottom plate, one side of the bottom plate is used for arranging a radiation unit, and the other side of the bottom plate is used for arranging a feed network; the first side plate and the second side plate are respectively connected with the bottom plate and are oppositely arranged; the first side plate and the second side plate respectively extend towards one side for arranging the feed network relative to the bottom plate; a first return plate connected with the first side plate, wherein the first return plate extends towards the direction of the feed network relative to the first side plate; and the second return plate is connected with the second side plate, and the second return plate extends towards the direction of the feed network relative to the second side plate. Through the design of the reflection device, the radiation performance of the base station antenna can be effectively improved.

Description

[0001] This application is a divisional application. The application number of the original application is 202010483822.5, and the original application date is June 1, 2020. The entire contents of the original application are incorporated into this application by reference. Technical Field

[0002] The present invention relates to the technical field of radio communications, and in particular to a reflection device of a base station antenna. Background Art

[0003] The base station antenna is an important part of the base station and is used to transmit or receive electromagnetic waves. The base station antenna mainly includes: a reflector, a radiation unit and a feed network. The reflector is a platform that carries the radiation unit and the feed network. The size and shape of the reflector have a significant impact on various performance indicators of the base station antenna, such as radiation performance.

[0004] Therefore, how to design a reflection device to improve the performance indicators of the base station antenna is an urgent problem to be solved. Summary of the invention

[0005] The present application provides a reflection device and a base station antenna, which can effectively improve the radiation performance of the antenna.

[0006] In a first aspect, an embodiment of the present application provides a reflection device for a base station antenna, comprising: a base plate, one side of the base plate is used to set a radiation unit, and the other side of the base plate is used to set a feeding network; a first side plate and a second side plate respectively connected to and opposite to each other in the base plate, the first side plate and the second side plate respectively extending relative to the base plate toward a side for setting the feeding network; a first return plate connected to the first side plate, the first return plate extending relative to the first side plate toward the feeding network; and a second return plate connected to the second side plate, the second return plate extending relative to the second side plate toward the feeding network.

[0007] The design of this reflection device can effectively improve the front-to-back ratio and the reliability of the reflection performance in the radiation performance of the base station antenna.

[0008] In one possible design, the first side panel has a through hole along the longitudinal direction of the first side panel; and / or the second side panel has a through hole along the longitudinal direction of the second side panel; wherein the longitudinal direction of the first side panel and the second side panel is consistent with the setting direction of the radiation unit.

[0009] A through hole is provided on the first side plate and / or the second side plate, thereby further improving the front-to-back ratio performance of the base station antenna.

[0010] In a possible design, the first return plate has a through hole along the longitudinal direction of the first return plate; and / or the second return plate has a through hole along the longitudinal direction of the second return plate; wherein the longitudinal directions of the first return plate and the second return plate are consistent with the direction in which the radiation unit is set.

[0011] A through hole is provided on the first return plate and / or the second return plate, thereby further improving the front-to-back ratio performance of the base station antenna.

[0012] In a possible design, the reflecting device also includes: a third side plate and a fourth side plate respectively connected to the base plate and arranged opposite to each other, and the third side plate and the fourth side plate respectively extend relative to the base plate toward a side for setting the radiation unit.

[0013] The provision of the third side panel and the fourth side panel can further improve the front-to-back ratio performance of the base station antenna.

[0014] In a possible design, a through hole may be provided along the longitudinal direction of the third side plate and / or the fourth side plate, wherein the longitudinal direction of the third side plate and the fourth side plate is consistent with the direction in which the radiation unit is arranged. This can further improve the front-to-back ratio performance of the base station antenna.

[0015] In a possible design, the angle θ1 between the first side plate and the bottom plate toward the feed network is in the range of 0°<θ1≤90°, and the angle θ2 between the second side plate and the bottom plate toward the feed network is in the range of 0°<θ2≤90°. This ensures that the width of the bottom plate (the length of the side perpendicular to the setting direction of the radiation unit) will not increase, while improving the reflection performance of the base station antenna, taking into account the convenience of installing the base station antenna and the weight of the base station antenna.

[0016] In a possible design, the angle β1 between the first side panel and the first return panel toward the feed network is in the range of 0°<β1<180°; the angle β2 between the second side panel and the second return panel toward the feed network is in the range of 0°<β2<180°.

[0017] The above design improves the flexibility of the design of the reflection device.

[0018] In a possible design, the through holes on the first side panel are multiple rectangular through holes, one side of the rectangular through holes along the longitudinal direction of the first side panel is L1, the side perpendicular to L1 is w1, and the distance between the multiple rectangular through holes is k1, wherein 0.3λ≤L1≤0.8λ, 0.01λ≤w1≤λ, 0.3λ≤k1≤0.8λ, λ is the operating wavelength of the center frequency point in the operating frequency band of the radiation unit; or, the through holes on the first side panel are multiple serpentine line through holes.

[0019] In one possible design, the through holes on the second side panel are multiple rectangular through holes, one side of the rectangular through holes along the longitudinal direction of the second side panel is L2, one side perpendicular to L1 is w2, and the distance between the multiple rectangular through holes is k2, wherein 0.3λ≤L2≤0.8λ, 0.01λ≤w2≤λ, 0.3λ≤k2≤0.8λ, λ is the operating wavelength of the center frequency point in the operating frequency band of the radiation unit; or, the through holes on the second side panel are multiple serpentine line through holes.

[0020] In a possible design, the through holes on the first return plate are multiple rectangular through holes, one side of the rectangular through holes along the longitudinal direction of the first return plate is L3, one side perpendicular to L3 is w3, and the distance between the multiple rectangular through holes is k3, wherein 0.3λ≤L3≤0.8λ, 0.01λ≤w3≤λ, 0.3λ≤k3≤0.8λ, λ is the operating wavelength of the center frequency point in the operating frequency band of the radiation unit; or, the through holes on the first return plate are multiple serpentine line through holes.

[0021] In a possible design, the through holes on the second return plate are multiple rectangular through holes, one side of the rectangular through holes along the longitudinal direction of the second return plate is L4, one side perpendicular to L2 is w4, and the distance between the multiple rectangular through holes is k4, wherein 0.3λ≤L2≤0.8λ, 0.01λ≤w4≤λ, 0.3λ≤k4≤0.8λ, λ is the operating wavelength of the center frequency point in the operating frequency band of the radiation unit; or, the through holes on the second return plate are multiple serpentine line through holes.

[0022] The through hole can be designed in different ways. When the through hole is designed as a serpentine through hole, the resonant size can be equivalently extended and a wider frequency band range can be obtained compared with a rectangular through hole.

[0023] In a possible design, the connection between the bottom plate and the first side plate, the bottom plate and the second side plate, the first side plate and the first return plate, and the second side plate and the second return plate can be one of the following: integral molding or coupled connection. The coupled connection includes non-metallic contact and metal contact.

[0024] In a second aspect, an embodiment of the present application provides a base station antenna, including a radiating unit, a feeding network and the first aspect of the present application, as well as a reflection device in various possible designs of the first aspect.

[0025] It should be understood that the beneficial effects achieved by the feasible implementation schemes corresponding to the possible designs in the second aspect of the present application are similar and will not be described in detail. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 An architecture diagram of a communication system provided in an embodiment of the present application;

[0027] Figure 2 A schematic diagram of the structure of a base station antenna provided in an embodiment of the present application;

[0028] Figure 3 This is a three-dimensional schematic diagram of a base station antenna according to an embodiment of the present application;

[0029] Figure 4 This is a front view of a base station antenna according to an embodiment of the present application;

[0030] Figure 5 A front view of a side panel provided in an embodiment of the present application;

[0031] Figure 6 A front view of a return plate provided in an embodiment of the present application;

[0032] Figure 7 A schematic diagram of a snake linear through hole provided for an application embodiment;

[0033] Figure 8 A schematic diagram of the structure of a base station antenna provided for an embodiment of the application;

[0034] Fig. 9 A before-and-after ratio comparison diagram provided in an embodiment of the present application. DETAILED DESCRIPTION

[0035] The present application provides a wireless communication system. Figure 1 This is a schematic diagram of the architecture of the wireless communication system in the embodiment of the present application, see Figure 1 As shown, the wireless communication system 10 may include a base station 11 and a terminal device 12. The base station 11 may communicate with the terminal device 12. Figure 1 The base station and terminal device included in the wireless communication system are only an example. In the embodiment of the present application, the type and quantity of network elements further included in the wireless communication system, and the connection relationship between the network elements are not limited thereto.

[0036] The above-mentioned wireless communication system can be a fourth generation (4G) communication system, such as a long term evolution (LTE) system, a 4.5G communication system, such as an advanced LTE (LTE advanced) system, a 5G communication system, such as a new radio (NR) system, a system integrating multiple communication systems, or a future evolved communication system.

[0037] Figure 1 The base station 11 in the figure can be a device on the access network side used to support terminal devices to access the wireless communication system, for example, it can be an evolved base station (evolved NodeB, eNB) in a 4G access technology communication system, a next generation base station (next generation NodeB, gNB) in a 5G access technology communication system, a transmission reception point (TRP, Transmission Reception Point), a relay node (Relay Node), an access point (Access Point, AP), etc.

[0038] Figure 1 The terminal device 12 in the embodiment can be a device that provides voice or data connectivity to the user, for example, it can also be called user equipment (UE), mobile station, subscriber unit, station or terminal equipment (TE), etc. The terminal device can be a cellular phone, a personal digital assistant (PDA), a wireless modem, a handheld device (handheld), a laptop computer, a cordless phone, a wireless local loop (WLL) station or a tablet computer (pad), etc. With the development of wireless communication technology, devices that can access a wireless communication system, can communicate with the network side of a wireless communication system, or can communicate with other devices through a wireless communication system can be terminal devices in the embodiment of the present application, for example, terminals and cars in intelligent transportation, household appliances in smart homes, power meter reading instruments in smart grids, voltage monitoring instruments, environmental monitoring instruments, video monitoring instruments in intelligent security networks, cash registers, etc. In the embodiment of the present application, the terminal device can communicate with the base station. The terminal device can be statically fixed or mobile.

[0039] Among the radiation performance indicators of base station antennas, the front-to-back ratio (FBR) is a very important indicator. FRB is defined as: the ratio of the power density in the forward maximum radiation direction of the base station antenna to the power density in the maximum radiation direction within the backward range of ±30 degrees (°), or the ratio of the maximum level of the front lobe to the maximum level of the back lobe in the radiation pattern of the base station antenna. FRB reflects the forward radiation capability of the base station, in other words, the ability to suppress backward interference. The size of the FRB ratio determines the directional radiation and / or reception performance of the base station antenna. For example, the larger the front-to-back ratio, the smaller the backward radiation of the base station antenna, that is, the higher the forward radiation performance of the base station antenna. The design of the reflector has a significant impact on the FRB of the base station antenna and can help improve the FBR of the base station antenna to a certain extent.

[0040] Figure 2 The figure is a schematic diagram of the structure of a base station antenna in the prior art. Figure 2 In the embodiment, the base station antenna 20 includes a radiation unit 21, a feed network 22 and a reflector 23, wherein the reflector includes a bottom plate 231 and a side plate 232 connected to the bottom plate 231 and extending toward one side of the radiation unit 21. The design of the reflector 23 controls the direction of the radiation energy of the radiation unit 21 to a certain extent, and reduces the backward radiation. However, with the development of wireless communication technology, in order to obtain better cell signal coverage, higher requirements are put forward for the front-to-back ratio, which prompts the improvement of the reflector.

[0041] The embodiment of the present application proposes a reflection device and a base station antenna including the reflection device, which can effectively help the base station antenna improve the performance index of the front-to-back ratio.

[0042] like Figure 3 The figure is a three-dimensional schematic diagram of a base station antenna according to an embodiment of the present application, and the base station antenna includes a radiation unit 31, a feeding network 32, and a reflection device 33. The reflection device 33 further includes: a bottom plate 331, a side plate 332 connected to the bottom plate 331, and a return plate 333 connected to the side plate 332.

[0043] The side plate 332 extends relative to the bottom plate 331 toward the feeding network 32. In one implementation, there may be two side plates 332, which are arranged opposite to each other (i.e., face to face) along the longitudinal direction of the bottom plate 331 and form angles θ1 and θ2 with the side of the bottom plate 331 facing the feeding network 32, respectively. The longitudinal direction of the bottom plate 331 is the direction in which the radiation unit 31 is arranged. Figure 3The x-axis direction in the graph. The value ranges of θ1 and θ2 are 0°<θ1≤90°, 0°<θ2≤90°, respectively. The bottom plate 331 and the side plate 332 can be connected by integral molding, that is, the bottom plate 331 and the side plate 332 are formed by stamping a metal plate. The bottom plate 331 and the side plate 332 can also be connected by coupling, for example, the bottom plate 331 and the side plate 332 are connected by setting a non-metallic component to form a gap S, optionally, 0.5 mm ≤ S ≤ 0.8 mm, or the return plate 331 and the side plate 332 are connected by riveting.

[0044] The return plate 333 extends relative to the side plate 332 toward the feed network 32. In one implementation, there may be two return plates 333, which are connected to the two side plates 332 along the longitudinal direction of the two side plates 332. The included angles of the return plate 333 and the side plates 332 toward the feed network 32 are β1 and β2, respectively. The longitudinal direction of the side plate 332 is the longitudinal direction of the bottom plate 331, which is also the setting direction of the radiation unit 31. Figure 3 The x-axis direction in the graph. The value ranges of β1 and β2 are 0°<β1<180°, 0°<β2<180° respectively. The return plate 333 and the side plate 332 can be connected by integral molding or by coupling. For example, the return plate 333 and the side plate 332 are connected by providing a non-metallic component to form a gap S, 0.5 mm ≤ S ≤ 0.8 mm, or the return plate 333 and the side plate 332 are connected by riveting.

[0045] In one implementation, the side plate 332 is provided with through holes 335 along its longitudinal direction, that is, the x-axis direction. There may be multiple through holes.

[0046] In one implementation, the return plate 333 has a through hole 336 along its longitudinal direction, that is, the x-axis direction. There may be multiple through holes.

[0047] By opening through holes on the side plate 332 and / or the back plate 333 , the FBR of the base station antenna can be further increased, thereby improving the radiation performance of the antenna.

[0048] The reflection device provided in the embodiment of the present application is not required to extend outward on one width side of the base plate (i.e., the side perpendicular to the longitudinal direction of the base plate) compared to the reflection device in the prior art, thereby effectively improving the reliability of the FBR performance and reflection performance of the base station antenna. This improves the radiation performance of the base station antenna while taking into account the convenience of installation of the base station antenna.

[0049] In one implementation, the width P of the bottom plate 331 (based on the y-axis direction) is 0.05λ≤P≤0.5λ, where λ is the working wavelength of the center frequency point in the working frequency band of the radiation unit 31 .

[0050] In one implementation, the reflecting device 33 also includes a side panel 334 connected to the bottom panel 331, and the side panel 334 extends relative to the bottom panel 331 toward the direction for setting the radiation unit 31. There are two side panels 334, which are arranged opposite to each other along the two sides of the longitudinal direction of the bottom panel 331. For example, the two side panels 334 form an angle of 90° with the bottom panel 331 respectively.

[0051] The provision of the side panels 334 can further improve the FBR of the base station.

[0052] In one implementation, the length of the side plate 331 along its longitudinal direction (x-axis direction) is consistent with the length of the bottom plate 332 along its longitudinal direction (x-axis direction), and the length of the return plate 333 along its longitudinal direction (x-axis direction) is consistent with the length of the side plate 332 along its longitudinal direction (x-axis direction).

[0053] It should be noted that the device composed of the bottom plate 331, the side plate 332 and the return plate 333 can be called a meandering choke plate. The through holes opened on the side plate 332 and / or the return plate 333 can also be called choke slots.

[0054] Figure 4 is a front view of a base station antenna according to an embodiment of the present application. This embodiment can be based on Figure 3 Embodiment. Further, it can be seen that at this time, θ1=θ2=90°, that is, a right angle is formed between the bottom plate 431 and the side plate 432; β1=β2=90°, that is, a right angle is formed between the side plate 432 and the return plate 433. The length of the side plate 432 along the y-axis direction (which can be called the height of the side plate 432) is w1. Optionally, the value range of w1 is 0.01λ≤w1≤λ. The length of the return plate 433 along the x-axis direction (which can be called the width of the return plate 433) is w4. Optionally, the value range of w4 can be 0.01λ≤w4≤λ.

[0055] Figure 5 The present application provides a front view of the side panel 332 and / or the side panel 432 described in the above embodiment. This embodiment can be based on one or more of the above embodiments, in order to introduce the side panel 332 and / or the side panel 432 involved in the above embodiment in more detail. Figure 5 The x-axis direction (the longitudinal direction of the side plate 50) is Figure 3 The bottom plate 331 (or the side plate 332 ) described in the embodiment has a longitudinal direction, and the radiation unit 51 is arranged along the longitudinal direction. Figure 5 The number of through holes 52 is 4. Figure 5The number of through holes is only for illustration and does not constitute any limitation on the number of through holes on the side plate of the embodiment of the present application. Optionally, the number of through holes on the side plate 50 is the same as the number of radiation units 51 included in the base station antenna, and the center line of the through hole 52 and the center line of the radiation unit 51 can be as follows Figure 5 The through hole 52 may be a rectangular through hole, one side along the longitudinal direction of the side plate 50 is L1, one side perpendicular to L1 is w1, and the distance between two adjacent through holes (i.e., the distance between the center lines of the two through holes) is k1, wherein L1, w1, and k1 may be set to 0.3λ≤L1≤0.8λ, 0.01λ≤w1≤λ, and 0.3λ≤k1≤0.8λ. Optionally, the arrangement direction of the through holes 52 is consistent with the x-axis direction (the longitudinal direction of the side plate 50), or in other words, parallel to one side of the side plate 50 along the longitudinal direction (x-axis direction).

[0056] Figure 6 This is a front view of a return plate described in the above embodiment provided in the present application. This embodiment can be based on one or more of the above embodiments, in order to introduce the return plate 333 and / or the return plate 433 involved in the above embodiments in more detail. Figure 6 The x-axis direction is Figure 3 In the longitudinal direction of the bottom plate 331 (or the side plate 332) described in the embodiment, the return plate 60 is provided with a through hole 61. Figure 6 The number of the through holes 62 is 4. Figure 6 The number of through holes in the side plate is only for illustration and does not constitute any limitation on the number of through holes in the side plate of the embodiment of the present application. Figure 5 The number of through holes included in the side plate 50 of the embodiment is consistent, the through hole 61 can be a rectangular through hole, and the center line (extension line) of the through hole 61 can be the same as Figure 5 In the embodiment, the center line (extension line) of the through hole 52 intersects, the value range of the size of the through hole 61 and the value range of the distance between two adjacent through holes 61 can be respectively Figure 5 The size of the through hole 52 of the embodiment and the distance between two adjacent through holes 52 are in the same range. In one implementation, the size of the through hole 61 and the distance between two adjacent through holes 61 are respectively Figure 5 The size of the through holes 52 and the distance between two adjacent through holes 52 are consistent. Optionally, the arrangement direction of the through holes 62 is consistent with the x-axis direction (the longitudinal direction of the return plate 60), or in other words, parallel to one side of the return plate 60 along the longitudinal direction (x-axis direction).

[0057] Figure 5 and Figure 6The through holes involved in the embodiments are all exemplified as rectangular through holes. Optionally, they can also be serpentine through holes. For example, Figure 7 As shown, a serpentine through hole is implemented. It should be noted that those skilled in the art can understand the meaning of the serpentine line, which is not limited to the implementation methods given in the embodiments of the present application. When a serpentine through hole is used, the resonant size can be equivalently extended, and a wider frequency band range can be obtained compared to a rectangular through hole.

[0058] based on Figures 5 to 7 An embodiment of Figure 8 The embodiment of the present application provides a front view of a base station antenna 80 including the above-mentioned reflection device, wherein the base station antenna includes a radiation unit 81, a feed network 82 and a reflection device 83, wherein the reflection device 83 includes a bottom plate 831, a pair of side plates 832 connected to the bottom plate 831, extending relative to the bottom plate 831 toward the feed network 82 and forming a 90° angle with the bottom plate 831, and a pair of return plates 833 respectively connected to the pair of side plates 832, respectively extending relative to the side plates 832 toward the feed network 82 and respectively forming a 90° angle with the side plates 832. The reflection device 83 also includes a pair of side plates 834 connected to the bottom plate 831, extending relative to the bottom plate 831 toward the radiation unit 81 and forming a 90° angle with the bottom plate 831.

[0059] Optionally, the base station antenna in each of the above embodiments operates in a frequency band of 1695 to 2690 MHz.

[0060] like Fig. 9 As shown, the antenna far-field test system is used to Figure 2 The antenna base station and Figure 8 The shown diagram is a comparison of FBR values ​​obtained by performing FBR index tests on antenna base stations. Fig. 9 In the figure, the horizontal axis represents the operating frequency band of the base station antenna, and the vertical axis represents the FBR value. Figure 2 The FBR value of the base station antenna is shown in the figure, and the solid line is Figure 8 As shown in the figure, the FBR value of the base station antenna designed by the reflector device of the embodiment of the present application is generally higher than the base station antenna used in the prior art in different frequency bands. In particular, in the working frequency band of 1695 to 2690 MHz, the front-to-back ratio can be improved by more than 3 decibels (dB).

[0061] In the above embodiments, the description of each embodiment has different emphases. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0062] It should be noted that in the embodiments of the present application, "at least one" refers to one or more, and "plurality" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b or c can represent: a, b, c, a and b, a and c, b and c, or a, b and c, where each of a, b, c can be an element itself, or a set containing one or more elements.

[0063] In the embodiments of the present application, "exemplary", "in some embodiments", "in another embodiment", "as an implementation method", etc. are used to indicate examples, illustrations or explanations. Any embodiment or design described as "example" in the present application should not be interpreted as being more preferred or more advantageous than other embodiments or design schemes. Specifically, the use of the word "example" is intended to present concepts in a concrete way. The words "first", "second", etc. involved in the embodiments of the present application are only used for the purpose of distinguishing descriptions, and cannot be understood as indicating or implying relative importance, nor can they be understood as indicating or implying order. The equal to involved in the embodiments of the present application can be used in conjunction with greater than, and is applicable to the technical solution adopted when greater than, and can also be used in conjunction with less than, and is applicable to the technical solution adopted when less than. It should be noted that when equal to is used in conjunction with greater than, it is not used in conjunction with less than; when equal to is used in conjunction with less than, it is not used in conjunction with greater than.

[0064] Those skilled in the art involved in the embodiments of the present application may clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described systems, devices and units may refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0065] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A reflection device for a base station antenna, characterized in that: include: A bottom plate, one side of the bottom plate is used to set the radiation unit, and the other side of the bottom plate is used to set the feeding network; A first side plate and a second side plate respectively connected to the bottom plate and arranged opposite to each other, the first side plate and the second side plate respectively extending relative to the bottom plate toward a side for arranging the feed network; A first return plate connected to the first side plate, the first return plate extending toward the feed network relative to the first side plate; as well as, A second return plate connected to the second side plate, wherein the second return plate extends relative to the second side plate toward the feeding network.

2. The reflecting device according to claim 1, characterized in that The first side plate has a through hole along the longitudinal direction of the first side plate; and / or, The second side plate is provided with a through hole along the longitudinal direction of the second side plate; Wherein, the longitudinal directions of the first side plate and the second side plate are consistent with the setting direction of the radiation unit.

3. The reflecting device according to claim 1 or 2, characterized in that: The first return plate is provided with a through hole along the longitudinal direction of the first return plate; and / or, The second return plate is provided with a through hole along the longitudinal direction of the second return plate; Wherein, the longitudinal directions of the first return plate and the second return plate are consistent with the direction in which the radiation unit is arranged.

4. The reflecting device according to any one of claims 1 to 3, characterized in that: The reflecting device further includes: a third side plate and a fourth side plate respectively connected to the bottom plate and arranged opposite to each other, and the third side plate and the fourth side plate respectively extend relative to the bottom plate toward a side for arranging the radiation unit.

5. The reflecting device according to any one of claims 1 to 4, characterized in that: The value range of the angle θ1 between the first side plate and the bottom plate toward the feed network is 0°<θ1≤90°, and the value range of the angle θ2 between the second side plate and the bottom plate toward the feed network is 0°<θ2≤90°.

6. The reflecting device according to any one of claims 1 to 5, characterized in that: The value range of the angle β1 between the first side plate and the first return plate toward the feed network is 0°<β1<180°; the value range of the angle β2 between the second side plate and the second return plate toward the feed network is 0°<β2<180°.

7. The reflecting device according to any one of claims 2 to 6, characterized in that: The through holes on the first side plate are a plurality of rectangular through holes, one side of the rectangular through holes along the longitudinal direction of the first side plate is L1, one side perpendicular to L1 is w1, and a distance between the plurality of rectangular through holes is k1, wherein 0.3λ≤L1≤0.8λ, 0.01λ≤w1≤λ, 0.3λ≤k1≤0.8λ, and λ is the working wavelength of the center frequency point in the working frequency band of the radiation unit; or, The through holes on the first side plate are a plurality of serpentine line through holes.

8. The reflecting device according to any one of claims 2 to 7, characterized in that: The through holes on the second side plate are a plurality of rectangular through holes, one side of the rectangular through holes along the longitudinal direction of the second side plate is L2, one side perpendicular to L1 is w2, and a distance between the plurality of rectangular through holes is k2, wherein 0.3λ≤L2≤0.8λ, 0.01λ≤w2≤λ, 0.3λ≤k2≤0.8λ, and λ is the working wavelength of the center frequency point in the working frequency band of the radiation unit; or, The through holes on the second side plate are a plurality of serpentine line through holes.

9. The reflecting device according to any one of claims 3 to 8, characterized in that: The through holes on the first return plate are a plurality of rectangular through holes, one side of the rectangular through holes along the longitudinal direction of the first return plate is L3, one side perpendicular to L3 is w3, and the distance between the plurality of rectangular through holes is k3, wherein 0.3λ≤L3≤0.8λ, 0.01λ≤w3≤λ, 0.3λ≤k3≤0.8λ, λ is the working wavelength of the center frequency point in the working frequency band of the radiation unit; or, The through holes on the first return plate are a plurality of serpentine line through holes.

10. The reflecting device according to any one of claims 3 to 9, characterized in that: The through holes on the second return plate are a plurality of rectangular through holes, one side of the rectangular through holes along the longitudinal direction of the second return plate is L4, one side perpendicular to L2 is w4, and the distance between the plurality of rectangular through holes is k4, wherein 0.3λ≤L2≤0.8λ, 0.01λ≤w4≤λ, 0.3λ≤k4≤0.8λ, λ is the working wavelength of the center frequency point in the working frequency band of the radiation unit; or, The through holes on the second return plate are a plurality of serpentine line through holes.

11. The reflecting device according to any one of claims 1 to 10, characterized in that: The bottom plate and the first side plate are integrally formed, or the bottom plate and the first side plate are coupled and connected; the first side plate and the first back plate are integrally formed, or the first side plate and the back plate are coupled and connected.

12. The reflecting device according to any one of claims 1 to 11, characterized in that: The bottom plate and the second side plate are integrally formed, or the bottom plate and the second side plate are coupled and connected; the second side plate and the second return plate are integrally formed, or the second side plate and the second return plate are coupled and connected.

13. The reflecting device according to claim 11 or 12, characterized in that: The coupling connection includes a non-metallic contact or a metallic contact.

14. A base station antenna, characterized in that: The invention comprises a radiation unit, a feeding network and a reflecting device as claimed in any one of claims 1 to 13.

Images