A beam tilting antenna

Abstract

The application provides a beam tilting antenna, and relates to the technical field of antennas.The beam tilting antenna comprises a cavity, a cover plate, a radiator and a coaxial line, the top of the cavity is provided with an opening, the cover plate is arranged at the top opening of the cavity and closes the cavity, the radiator is arranged in the cavity and is electrically connected with the cavity, the first hollow area is arranged on the radiator, the first bevel and the second bevel are arranged on the radiator, the first bevel is inclined relative to the second bevel, the second hollow area is formed between the first bevel and the second bevel, the first hollow area and the second hollow area are communicated and form a feed gap, the outer conductor of the coaxial line is connected to one side of the feed gap, and the inner conductor of the coaxial line is connected to the other side of the feed gap, the beam tilting antenna can form an inclined beam, has a simple structure and a large bandwidth.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of antennas, in particular to a beam tilting antenna. BACKGROUND

[0002] Due to the need for measurement and control during the flight or descent of an airborne carrier, the carrier will be equipped with an antenna with a tilting beam on its surface, and the included angle between the beam and the axis of the flying carrier is between 0°-90°.

[0003] In the application of communication base station antennas, a beam tilting antenna can be used to construct a single-sided large-angle scanning antenna array, which can effectively solve the problem of down-view coverage of wireless communication. The pattern reconfigurable technology can effectively realize beam tilting, but a complex bias network is needed in the design. The resonant cavity or dielectric resonant antenna can realize beam tilting by adjusting the amplitude and phase distribution of the antenna aperture field, but the antenna profile is large and the bandwidth is narrow. The quasi-Yagi antenna structure combined with a reflecting ground can effectively realize beam tilting, but the antenna structure is complex and the performance is greatly affected by structural parameters such as profile depth. In summary, in the application scenarios of telemetry, fuze, base station communication, etc., the antennas capable of forming a tilting beam mostly have the shortcomings of complex structure, narrow bandwidth, etc. SUMMARY

[0004] The purpose of the present application includes, for example, providing a beam tilting antenna capable of forming a tilting beam and having a simple structure and a large bandwidth.

[0005] The present application can be implemented as follows:

[0006] The present application provides a beam tilting antenna, which comprises:

[0007] a cavity, the top opening of the cavity is provided;

[0008] a cover plate, which is arranged at the top opening of the cavity and closes the cavity;

[0009] a radiator, which is arranged in the cavity and electrically connected to the cavity, the radiator is provided with a first hollow area, the radiator is provided with a first bevel and a second bevel, the first bevel is inclined relative to the second bevel, the first bevel and the second bevel form a second hollow area, the first hollow area and the second hollow area are connected and form a feed gap;

[0010] a coaxial line, the outer conductor of the coaxial line is connected to one side of the feed gap, and the inner conductor of the coaxial line is connected to the other side of the feed gap.

[0011] Optionally, the profile of the radiator in the vertical plane is rectangular, the first hollowed-out region is circular, and the distance between the center of the first hollowed-out region and the long side of the radiator is equal to the distance between the center of the first hollowed-out region and the high side of the radiator.

[0012] Optionally, the length of the radiator is 40-44 mm, and the height of the radiator is 8-12 mm.

[0013] Optionally, the radius of the first hollowed-out region is 2.3-2.7 mm, and the distance between the center of the first hollowed-out region and the long side of the radiator or the distance between the center of the first hollowed-out region and the high side of the radiator is 2.8-3.2 mm.

[0014] Optionally, the angle between the straight line passing through the center of the first hollowed-out region in the direction of the high side of the radiator and the line connecting the center of the first hollowed-out region to the center of the feed gap is 30-60°.

[0015] Optionally, the minimum distance between the intersection point of the first inclined side and the long side of the radiator and the high side of the radiator is 8-12 mm, and the intersection point of the second inclined side and the edge of the radiator is one of the vertices of the radiator.

[0016] Optionally, the width of the feed gap is 0.5-1 mm.

[0017] Optionally, the two opposite surfaces of the cover plate in the vertical direction are planar, or the two opposite surfaces of the cover plate in the vertical direction are cylindrical.

[0018] Optionally, when the two opposite surfaces of the cover plate in the vertical direction are cylindrical, the top surface of the cavity is also cylindrical, the maximum distance between the top surface and the bottom surface of the cavity is 8-12 mm, and the minimum distance between the top surface and the bottom surface of the cavity is 3-5.4 mm.

[0019] Optionally, the distance between the two opposite surfaces of the cover plate in the vertical direction is 3-4 mm.

[0020] The beneficial effects of the beam tilting antenna of the present application include, for example: in order to form a tilted beam and simplify the structure, increase the bandwidth, a beam tilting antenna is designed, which comprises a cavity, a cover plate, a radiator and a coaxial line, the top of the cavity is provided with an opening, the cover plate is arranged at the top opening of the cavity and closes the cavity, the radiator is arranged in the cavity and is electrically connected with the cavity, the first hollow area is arranged on the radiator, the first bevel and the second bevel on the radiator form the second hollow area, the first hollow area and the second hollow area are communicated and form a feed gap, the outer conductor of the coaxial line is connected to one side of the feed gap, and the inner conductor of the coaxial line is connected to the other side of the feed gap, since the feed gap is formed between the first hollow area and the second hollow area, and the first bevel is inclined relative to the second bevel, a tilted beam is formed through the feed gap, the antenna structure is relatively simple, and the bandwidth is relatively wide. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced below, and it should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0022] Figure 1 The structure diagram of the beam tilting antenna in the embodiments of the present application is shown in the figure.

[0023] Figure 2 The structure diagram of the radiator in the embodiments of the present application is shown in the figure.

[0024] Figure 3 The diagram for showing the size of the radiator in the embodiments of the present application is shown in the figure.

[0025] Figure 4 The structure diagram of the cavity with a flat top surface in the embodiments of the present application is shown in the figure.

[0026] Figure 5 The structure diagram of the cavity with a cylindrical top surface in the embodiments of the present application is shown in the figure.

[0027] Figure 6 The structure diagram of the planar cover plate in the embodiments of the present application is shown in the figure.

[0028] Figure 7 The structure diagram of the cylindrical cover plate in the embodiments of the present application is shown in the figure.

[0029] Figure 8 The diagram for showing the relationship between the antenna port standing wave ratio and frequency in the embodiments of the present application is shown in the figure.

[0030] Figure 9Yoz plane antenna gain pattern under the cavity structure with a flat top surface in the embodiment of the present application;

[0031] Figure 10 Xoz plane antenna gain pattern under the cavity structure with a flat top surface in the embodiment of the present application;

[0032] Figure 11 Yoz plane first antenna gain pattern under the cavity structure with a cylindrical top surface in the embodiment of the present application;

[0033] Figure 12 Yoz plane second antenna gain pattern under the cavity structure with a cylindrical top surface in the embodiment of the present application;

[0034] Figure 13 Xoz plane first antenna gain pattern under the cavity structure with a cylindrical top surface in the embodiment of the present application;

[0035] Figure 14 Xoz plane second antenna gain pattern under the cavity structure with a cylindrical top surface in the embodiment of the present application.

[0036] Figure legend: 1-cavity; 2-cover plate; 3-radiator; 31-first hollowed-out area; 32-first bevel; 33-second bevel; 34-feeding gap; 35-second hollowed-out area; 4-coaxial line; 41-outer conductor; 42-inner conductor. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present application.

[0039] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0040] In the description of the present application, it should be noted that if the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, or the orientation or positional relationship of the product in use, only for the convenience of describing the present application and simplifying the description, and cannot be understood as indicating or implying that the device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as limiting the present application.

[0041] In addition, if the terms "first", "second" and the like appear, they are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0042] It should be noted that the features in the embodiments of the present application can be combined with each other without conflict.

[0043] The inventors of the present application found that in telemetry, fuze, base station communication and other application scenarios, most of the antennas capable of forming a tilted beam have the shortcomings of complex structure, narrow bandwidth, etc. The embodiments of the present application provide a beam tilting antenna which can form a tilted beam and has a simple structure and a large bandwidth.

[0044] Please refer to Figures 1-7 The beam tilting antenna provided by the embodiments of the present application includes a cavity 1, a cover plate 2, a radiator 3 and a coaxial line 4. The top of the cavity 1 is open. The cover plate 2 is arranged at the top opening of the cavity 1 and closes the cavity 1. The radiator 3 is arranged in the cavity 1 and is electrically connected with the cavity 1. The first hollow area 31 is arranged on the radiator 3. The first bevel 32 and the second bevel 33 are arranged on the radiator 3. The first bevel 32 is inclined relative to the second bevel 33. The second hollow area 35 is formed between the first bevel 32 and the second bevel 33. The first hollow area 31 and the second hollow area 35 are communicated and form a feed gap 34. The outer conductor 41 of the coaxial line 4 is connected to one side of the feed gap 34. The inner conductor 42 of the coaxial line 4 is connected to the other side of the feed gap 34.

[0045] In the embodiment, the cavity 1 is placed in a three-dimensional coordinate system for illustration, the cavity 1 is in the shape of a rectangular body, the long side and the wide side of the cavity 1 are equal, the long side of the cavity 1 extends along the y-axis direction, the wide side of the cavity 1 extends along the x-axis direction, and the high side of the cavity 1 extends along the z-axis direction; the top of the cavity 1 is open, the inner side and the inner bottom of the cavity 1 are metal surfaces, the radiator 3 is arranged in the cavity 1 and is in contact with and electrically connected to the inner side and the inner bottom of the cavity 1; the radiator 3 is generally in the shape of a sheet, and the radiator 3 is located in the yoz plane, the included angle between the first inclined side 32 and the z-axis is smaller than the included angle between the second inclined side 33 and the z-axis; the coaxial line 4 is used for feeding the radiator 3, the coaxial line 4 extends from the bottom of the radiator 3 to the feeding gap 34 in an upward and inclined manner, one end of the outer conductor 41 of the coaxial line 4 is welded to one side of the feeding gap 34, and the inner conductor 42 of the coaxial line 4 crosses the feeding gap 34 and is welded to the other side of the feeding gap 34.

[0046] The feeding gap 34 is formed between the first hollow area 31 and the second hollow area 35 and communicates the first hollow area 31 and the second hollow area 35, the first inclined side 32 is inclined relative to the second inclined side 33, the inclined beam is formed in the feeding gap 34 and extends upward and inclined in the second hollow area 35, and the antenna structure is relatively simple and has a large bandwidth.

[0047] In other embodiments, the first inclined side 32 and the second inclined side 33 can adopt an exponential line or other curves, and the feeding gap 34 is formed between the first hollow area 31 and the second hollow area 35 formed by the two curves.

[0048] In actual engineering operations, the beam tilting antenna is arranged on a carrier such as an aircraft, and the aircraft is provided with a groove with a size consistent with that of the cavity 1, and the cover plate 2 is coplanar with the surface of the carrier, so that the application of the carrier to the antenna can be ensured without affecting the aerodynamic shape of the carrier.

[0049] The profile of the radiator 3 in the vertical plane is rectangular, the first hollow area 31 is circular, and the distance between the center of the first hollow area 31 and the long side of the radiator 3 is equal to the distance between the center of the first hollow area 31 and the high side of the radiator 3.

[0050] In the embodiment, the origin o of the three-dimensional coordinate system coincides with the midpoint of one of the wide sides of the cavity 1, and the radiator 3 is located in the yoz plane, so that the radiator 3 is located in the middle of the cavity 1, the long side of the radiator 3 extends along the y-axis direction, and the high side of the radiator 3 extends along the z-axis direction; the first hollow area 31 is close to the origin o of the three-dimensional coordinate system, the center of the first hollow area 31 is the center of the circle, and the distance between the center of the first hollow area 31 and the long side and the high side of the radiator 3 is equal; the radiator 3 can be prepared by cutting a thin metal plate, or a desired metal structure can be etched on one side of a dielectric plate by using printed circuit board technology.

[0051] In other embodiments, the radiator 3 can deviate from the middle of the cavity 1, i.e. the distance between the radiator 3 and the two long sides of the cavity 1 is not equal; the first hollow area 31 is rectangular or square, and the profile of the radiator 3 in the vertical plane is trapezoidal, regular polygon, etc.

[0052] In this embodiment, the length of the radiator 3 is 40-44 mm, and the height of the radiator 3 is 8-12 mm.

[0053] It should be noted that the length of the radiator 3, i.e. the size of the radiator 3 in the y-axis direction, is equal to the size of the inner bottom wall of the cavity 1 in the y-axis direction, and the length can be 40 mm, 42 mm or 44 mm; the height of the radiator 3, i.e. the size of the radiator 3 in the z-axis direction, is equal to the size of the inner side wall of the cavity 1 in the z-axis direction, and the height can be 8 mm, 10 mm or 12 mm.

[0054] In this embodiment, the radius of the first hollow area 31 is 2.3-2.7 mm, and the distance between the center of the first hollow area 31 and the long side of the radiator 3 or the distance between the center of the first hollow area 31 and the high side of the radiator 3 is 2.8-3.2 mm.

[0055] In the case where the first hollow area 31 is circular, the radius of the first hollow area 31 is 2.3-2.7 mm, which can be 2.3 mm, 2.5 mm or 2.7 mm; the distance between the center of the first hollow area 31 and the long side of the radiator 3 is equal to the distance between the center of the first hollow area 31 and the high side of the radiator 3, which is slightly larger than the radius of the first hollow area 31, and can be 2.8 mm, 3 mm or 3.2 mm.

[0056] In this embodiment, the angle between the straight line passing through the center of the first hollow area 31 in the high side direction of the radiator 3 and the line connecting the center of the first hollow area 31 to the center of the feed gap 34 is 30-60°.

[0057] It should be noted that the high side direction of the radiator 3 is the z-axis direction, and the angle between the straight line passing through the center of the first hollow area 31 in the z-axis direction and the line connecting the center of the first hollow area 31 to the center of the feed gap 34 is 30-60°, for example, the angle is 30°, 45° or 60°.

[0058] In this embodiment, the minimum distance between the intersection point of the first bevel 32 and the long side of the radiator 3 and the high side of the radiator 3 is 8-12 mm, and the intersection point of the second bevel 33 and the radiator 3 is one of the vertices of the radiator 3.

[0059] It should be noted that the minimum distance between the intersection point of the first inclined side 32 and the long side of the radiator 3 and the high side of the radiator 3 refers to the distance between the intersection point of the first inclined side 32 and the top long side of the radiator 3 and the high side of the radiator 3 closest to the intersection point, which is 8-12 mm, and the distance can be 8 mm, 10 mm or 12 mm; the intersection point of the second inclined side 33 and the edge of the radiator 3 is the top point of the upper right of the radiator 3.

[0060] In this embodiment, the width of the feed gap 34 is 0.5-1 mm.

[0061] It should be noted that the width of the feed gap 34 is the distance between the intersection point of the first inclined side 32 and the edge of the first hollow area 31 and the intersection point of the second inclined side 33 and the edge of the first hollow area 31, which can be 0.5 mm, 0.75 mm or 1 mm.

[0062] In this embodiment, the two surfaces of the cover plate 2 in the vertical direction are planar, or the two surfaces of the cover plate 2 in the vertical direction are cylindrical.

[0063] In fact, the shape of the cover plate 2 matches the shape of the carrier surface to conform to the carrier surface, when the carrier surface is planar, the two surfaces of the cover plate 2 in the vertical direction are planar; when the carrier surface is cylindrical, the two surfaces of the cover plate 2 in the vertical direction are cylindrical; the shape of the two surfaces of the cover plate 2 in the vertical direction, i.e., the z-axis direction, matches the shape of the top surface of the cavity 1 to seal the cavity 1.

[0064] In the case where the two surfaces of the cover plate 2 in the z-axis direction are planar, the height of the cavity 1 is 8-12 mm; in the case where the two surfaces of the cover plate 2 in the z-axis direction are cylindrical, the top surface of the cavity 1 is cylindrical, the radiator 3 is arranged at the maximum height in the middle of the cavity 1, the maximum distance between the top surface and the bottom surface of the cavity 1 is 8-12 mm, and the minimum distance between the top surface and the bottom surface of the cavity 1 is 3-5.4 mm.

[0065] For example, in the case where the two surfaces of the cover plate 2 in the z-axis direction are planar, the height of the cavity 1 is 8 mm, 10 mm or 12 mm.

[0066] In the case where the two surfaces of the cover plate 2 in the z-axis direction are cylindrical, the maximum distance between the top surface and the bottom surface of the cavity 1 is 8 mm, 10 mm or 12 mm, and the minimum distance between the top surface and the bottom surface of the cavity 1 is 3 mm, 4 mm or 5.4 mm.

[0067] In fact, the cavity 1 can be varied with the shape of the carrier to meet the needs of different application scenarios. When the size of the cavity 1 is limited and the antenna needs to have a lower operating frequency, the cavity 1 can be filled with a dielectric material.

[0068] In this embodiment, the distance between the two opposite surfaces of the cover plate 2 in the vertical direction is 3-4 mm.

[0069] The distance between the two opposite surfaces of the cover plate 2 in the z-axis direction is the thickness of the cover plate 2, which is 3 mm, 3.5 mm or 4 mm; the length and width of the cover plate 2 are equal to the length and width of the cavity 1 respectively; the cover plate 2 can be processed by using materials such as polytetrafluoroethylene, and the processing can be performed by using a mold or a machine tool milling method, and the cover plate 2 has a certain influence on the working frequency of the antenna, and with the increase of the dielectric constant, the working frequency will move to a low frequency with a small amplitude.

[0070] As a performance description, this embodiment takes an antenna example as a sample, and the specific parameter values of the antenna are as follows: for the cavity 1 with a planar top surface, the length L of the cavity 1 is equal to the width W of the cavity 1, that is, L=W=42 mm, the height H of the cavity 1 is 10 mm, the minimum distance L1 between the intersection of the first bevel 32 and the long side of the radiator 3 and the high side of the radiator 3 is 10 mm, the radius r of the first hollow area 31 is 2.5 mm, the distance d between the center of the first hollow area 31 and the long side of the radiator 3 or the distance d between the center of the first hollow area 31 and the high side of the radiator 3 is 3 mm, the angle θ between the straight line passing through the center of the first hollow area 31 in the direction of the high side of the radiator 3 and the line connecting the center of the first hollow area 31 to the center of the feed gap 34 is 45°, the width g of the feed gap 34 is 0.75 mm, and the thickness t1 of the cover plate 2 is 3.5 mm; for the cavity 1 with a cylindrical top surface, the maximum distance H between the top surface and the bottom surface of the cavity 1 is 10 mm, the minimum distance H1 between the top surface and the bottom surface of the cavity 1 is 5.4 mm or 3 mm, and the height H2 of the cover plate 2 is H-H1.

[0071] Figure 8 The port standing wave ratios of the antenna under the cavity structure with a planar top surface and the port standing wave ratios of the antenna under the cavity structure with a cylindrical top surface and two values of H1 are given. It can be seen that when the standing wave ratio is less than or equal to two, the working frequency range of the antenna in the cavity structure with a planar top surface is 3.31-3.86 GHz, at this time the absolute bandwidth is 550 MHz, and the relative bandwidth is 15.34%; the working frequency range of the antenna in the cavity structure with a cylindrical top surface changes little with the value of H1, that is, the working frequency ranges when H1=5.4 mm and H1=3 mm change little, the absolute bandwidth is more than 450 MHz, and the relative bandwidth is more than 12.44%. This shows that from the perspective of the working bandwidth, the embodiment can meet the needs of practical applications such as fuzes and telemetry.

[0072] Figures 9-10The yoz plane and xoz plane gain patterns of the antenna under the cavity structure with a planar top surface at 3.31 GHz, 3.58 GHz and 3.86 GHz are given. It can be seen from the yoz plane that the antenna gain pattern has an obvious forward tilt, and it can be seen from the xoz plane that the antenna gain pattern has a left-right symmetry. The maximum radiation gains of the three frequency points of 3.31 GHz, 3.58 GHz and 3.86 GHz are 6.32 dBi, 6.66 dBi and 7.09 dBi respectively. It can be seen from the yoz plane pattern that the 3dB angle range of the beam tilt of the three frequency points is -22°-77°, -15°-81° and -4°-88° respectively with the z-axis as the starting 0°. As the frequency increases, the beam tilt angle increases, and the beam width is more than 90°, which can fully meet the engineering application requirements. The beam width of the xoz plane gain pattern is 90°, 86° and 82° respectively.

[0073] Figures 11-14 The yoz plane and xoz plane gain patterns of the antenna under the cavity structure with a cylindrical top surface when H1=5.4 mm or 3 mm at 3.39 GHz, 3.62 GHz and 3.84 GHz are given. When H1=5.4 mm, the maximum radiation gains of the three frequency points of 3.39 GHz, 3.62 GHz and 3.84 GHz are 6.21 dBi, 6.48 dBi and 7.00 dBi respectively. When H1=3 mm, the maximum radiation gains of the three frequency points of 3.39 GHz, 3.62 GHz and 3.84 GHz are 6.02 dBi, 6.42 dBi and 6.75 dBi respectively.

[0074] When H1=5.4 mm, the 3dB angle range of the beam tilt of the three frequency points in the yoz plane pattern is -18°-78°, -9°-83° and 2°-87° respectively. When H1=3 mm, the 3dB angle range of the beam tilt of the three frequency points in the yoz plane pattern is -15°-80°, -7°-83° and 4°-87° respectively. When H1=5.4 mm, the beam width of the xoz plane gain pattern is 98°, 102° and 108° respectively. When H1=3 mm, the beam width of the xoz plane gain pattern is 104°, 108° and 134° respectively.

[0075] From the above data, the characteristics of the antenna radiation pattern can be summarized as follows: 1. The antenna gain pattern has the same forward tilt and left-right symmetry characteristics under the two cavity structures, and the antenna forward tilt under the cavity structure with a columnar top surface is more obvious; 2. Compared with the cavity structure with a planar top surface, the yoz plane beam under the cavity structure with a columnar top surface is narrower, the xoz plane beam is wider, and the gain is slightly lower; 3. Under the cavity structure with a columnar top surface, the xoz plane pattern of the antenna gradually narrows as the frequency increases, while under the cavity structure with a columnar top surface, the xoz plane pattern gradually widens as the frequency increases; 4. Under the cavity structure with a columnar top surface, the smaller the H1, the larger the xoz plane pattern of the antenna, and the smaller the gain. From these characteristics, the beam forward tilt characteristics of the antenna remain unchanged under different cavity top surface structures, which can meet the application requirements of different carriers, and adaptive adjustment can be made according to the provided characteristic law in specific applications.

[0076] The above merely provides a specific implementation of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A beam tilting antenna, characterized by, The application relates to a cavity antenna. The cavity antenna comprises: a cavity with a top opening; a cover plate arranged at the top opening of the cavity and sealing the cavity; a radiator arranged in the cavity and electrically connected with the cavity, the radiator being provided with a first hollow area, a first bevel and a second bevel, the first bevel being inclined relative to the second bevel, the first bevel and the second bevel forming a second hollow area, the first hollow area and the second hollow area being connected and forming a feed gap; a coaxial line, the outer conductor of the coaxial line being connected to one side of the feed gap, and the inner conductor of the coaxial line being connected to the other side of the feed gap; the radiator is in a sheet shape, and an inclined beam can be formed in the feed gap and extend upward in the second hollow area; the profile of the radiator in a vertical plane is rectangular, the first hollow area is circular, and the distance between the center of the first hollow area and the long side of the radiator is equal to the distance between the center of the first hollow area and the high side of the radiator; the coaxial line extends upward from the bottom of the radiator to the feed gap, one end of the outer conductor of the coaxial line is welded to one side of the feed gap, and the inner conductor of the coaxial line crosses the feed gap and is welded to the other side of the feed gap; 2. The beam tilting antenna of claim 1, wherein, the inner side and the inner bottom of the cavity are metal surfaces, the radiator is in contact with and electrically connected with the inner side and the inner bottom of the cavity, and the radiator is prepared by cutting a metal plate.

3. The beam tilting antenna of claim 1, wherein, The length of the radiator is 40-44 mm, and the height of the radiator is 8-12 mm.

4. The beam tilting antenna of claim 1, wherein, The radius of the first hollow area is 2.3-2.7 mm, and the distance between the center of the first hollow area and the long side of the radiator or the distance between the center of the first hollow area and the high side of the radiator is 2.8-3.2 mm.

5. The beam tilting antenna of claim 1, wherein, The angle between the straight line passing through the center of the first hollow area in the direction of the high side of the radiator and the line connecting the center of the first hollow area to the center of the feed gap is 30-60 degrees.

6. The beam tilting antenna of claim 1, wherein, The minimum distance between the intersection point of the first bevel and the long side of the radiator and the high side of the radiator is 8-12 mm, and the intersection point of the second bevel and the edge of the radiator is one of the vertices of the radiator.

7. The beam tilting antenna of claim 1, wherein, The width of the feed gap is 0.5-1 mm.

8. The beam tilting antenna of claim 7, wherein, The two opposite surfaces of the cover plate in the vertical direction are flat surfaces, or the two opposite surfaces of the cover plate in the vertical direction are cylindrical surfaces.

9. The beam tilting antenna of claim 7, wherein, When the two opposite surfaces of the cover plate in the vertical direction are cylindrical surfaces, the top surface of the cavity is a cylindrical surface, the maximum distance between the top surface and the bottom surface of the cavity is 8-12 mm, and the minimum distance between the top surface and the bottom surface of the cavity is 3-5.4 mm. The distance between the two opposite surfaces of the cover plate in the vertical direction is 3-4 mm.

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