Radiating elements and base station antennas

Abstract

The present application relates to the field of antenna technology, and in particular to a radiation unit and a base station antenna. The radiation unit includes a radiation component, a feed balun and a feed core, wherein the radiation component is supported on the feed balun and electrically connected to the feed balun, and the feed balun has a first feed hole; the feed core is inserted into the first feed hole, and one end of the feed core is electrically connected to the feed balun, and the other end passes through the first feed hole and is bent to form a first connection portion, and the first connection portion is used to electrically connect to the strip line circuit in the phase shifter. By setting the bending direction and bending angle of the first connection portion, the spacing between the positive feed core and the negative feed core can be adjusted to adapt to the connection of cavities of different widths, and by adjusting the bending direction and bending angle of the first connection portion, the angle between the first connection portion and the strip line in the cavity can be reduced, thereby reducing the difficulty of electrical connection and improving the connection quality.

Description

Technical Field

[0001] The present application relates to the field of antenna technology, and in particular to a radiation unit and a base station antenna. Background Art

[0002] Green and environmental protection is an important development direction for base station antennas. Cable-free feeding technology has become the mainstream solution in the industry by replacing coaxial lines with strip lines to reduce losses and improve radiation efficiency. One of the technical approaches is to electrically connect the feed core of the radiating unit with the strip line in the cavity, but this solution has certain technical defects in implementation.

[0003] The industry's high-frequency (1710-2170MHz or 1710-2690MHz) dual-polarization radiating units use conventional technology to use feed core coupling feeding. The positive polarization feed core and the negative polarization feed core are set in a pair of feed holes, and the center distance of the feed holes is 8-15mm. The phase shifter is a dual-cavity design, and each sub-cavity is fed by a polarization unit.

[0004] First, when the cavity is designed as a vertical cavity, that is, the plane where the strip line in the cavity is located is perpendicular to the reflector, the spacing between the positive and negative polarization output ports of the phase shifter often exceeds 15mm, and there is a mismatch between the spacing between the two feed cores of the radiating unit and the port spacing of the phase shifter. Secondly, the feed core is generally designed as a sheet metal part. Through stamping, there is an angle between the end of the feed core and the strip line, and the electrical connection between the feed core and the strip line in the cavity is not easy to achieve. Summary of the invention

[0005] In order to solve the above technical problem or at least partially solve the above technical problem, the present application provides a radiation unit and a base station antenna.

[0006] A first aspect of the present application provides a radiation unit, including a radiation component, a feed balun and a feed core, wherein the radiation component is supported on and electrically connected to the feed balun, and the feed balun has a first feeding hole; the feed core is inserted into the first feeding hole, and one end of the feed core is electrically connected to the feed balun, and the other end passes through the first feeding hole and is bent to form a first connecting portion, and the first connecting portion is used to be electrically connected to a stripline circuit in a phase shifter.

[0007] In some embodiments, the feed core includes a first feed segment, a second feed segment, a third feed segment and a first connecting portion which are arranged in sequence, the first feed segment and the third feed segment are respectively connected to two ends of the second feed segment, the first connecting portion is arranged at an end of the third feed segment away from the second feed segment, and the first connecting portion includes a fourth feed segment and a fifth feed segment, the fourth feed segment is bent relative to the third feed segment, and the fifth feed segment is bent relative to the fourth feed segment.

[0008] In some embodiments, a plane where the fifth feeding segment is located is arranged at an angle to a plane where the fourth feeding segment is located.

[0009] In some embodiments, the feeding balun includes a first outer cylinder and a second outer cylinder, the first outer cylinder forms the first feeding hole inside, and the second outer cylinder forms the second feeding hole inside; the first outer cylinder and the second outer cylinder are arranged adjacent to each other, and a connecting groove is provided on the side wall of the first outer cylinder, the connecting groove connects the first feeding hole and the second feeding hole, and the first connecting portion penetrates from the connecting groove into the second feeding hole.

[0010] In some embodiments, the communicating groove is arranged along the axial direction of the first outer cylinder and extends from one end of the first outer cylinder to the other end of the first outer cylinder.

[0011] In some embodiments, the second outer cylinder is connected to a side wall of an end of the first outer cylinder away from the radiation component.

[0012] In some embodiments, the radiating component includes a first dipole and a second dipole arranged orthogonally, the first dipole includes two first radiating arms, and the second dipole includes two second radiating arms; the feed balun includes two first feed baluns and two second feed baluns, the two first feed baluns are respectively connected to the first radiating arms, and the two second feed baluns are respectively connected to the two second radiating arms;

[0013] There are two feed cores, namely a first feed core and a second feed core. One end of the first feed core is connected to a corresponding feed of the first feed balun, and the other end of the first feed core is inserted into the first feed hole and the second feed hole of another first feed balun; one end of the second feed core is connected to a corresponding feed of the second feed balun, and the other end of the second feed core is inserted into the first feed hole and the second feed hole of another second feed balun.

[0014] In some embodiments, the cross-sectional shape of the first feeding hole is one of circular, elliptical, rectangular or oval; and / or the cross-sectional shape of the second feeding hole is one of circular, elliptical, rectangular or oval.

[0015] The second aspect of the present application also provides a base station antenna, comprising a reflector, a phase shifter and a radiation unit as described in any one of the above items, wherein the radiation unit and the phase shifter are respectively arranged on both sides of the reflector; the phase shifter comprises a cavity and a stripline circuit arranged in the cavity, the stripline circuit has a second connecting part, a through hole is provided at a position on the cavity corresponding to the second connecting part, the first connecting part extends into the cavity from the through hole and is electrically connected to the second connecting part, and the position where the first connecting part is connected to the second connecting part is arranged parallel to the second connecting part.

[0016] In some embodiments, the first connection portion is in the shape of a sheet, the second connection portion is in the shape of a sheet, and the first connection portion is parallel to and closely attached to the second connection portion.

[0017] Compared with the prior art, the technical solution provided by the embodiments of the present application has the following advantages:

[0018] In the radiation unit provided in the embodiment of the present application, one end of the feed core is bent to form a first connection portion, and the first connection portion is located outside the first feed hole. Therefore, when the structure and size of the radiation component remain unchanged, by setting the bending direction and bending angle of the first connection portion, the spacing between the positive feed core and the negative feed core can be adjusted to adapt to the connection of cavities of different widths, and by adjusting the bending direction and bending angle of the first connection portion, the angle between the first connection portion and the strip line in the cavity can be reduced, thereby reducing the difficulty of electrical connection and improving the connection quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0021] Figure 1 It is a schematic diagram of the structure of a traditional base station antenna;

[0022] Figure 2 It is a schematic diagram of the connection structure between the feed core and the strip line in a traditional base station antenna;

[0023] Figure 3 This is a schematic diagram of the structure of the base station antenna described in some embodiments of the present application;

[0024] Figure 4A schematic diagram of the structure of the radiation part and the feeding balun described in some embodiments of the present application;

[0025] Figure 5 A top view of the radiation part and the feeding balun described in some embodiments of the present application;

[0026] Figure 6 This is a schematic diagram of the structure of the feed core described in some embodiments of the present application;

[0027] Figure 7 This is a schematic diagram of the structure of the base station antenna described in some embodiments of the present application;

[0028] Figure 8 This is a schematic diagram of the structure of the base station antenna described in some embodiments of the present application;

[0029] Fig. 9 This is a schematic diagram of the structure of the base station antenna described in some embodiments of the present application;

[0030] Fig.10 This is a schematic diagram of the structure of the base station antenna described in some embodiments of the present application.

[0031] Among them, 1, radiation component; 1a, first dipole; 1b, second dipole; 2, cavity; 11, first radiation arm; 12, second radiation arm; 13, first outer cylinder; 131, first feeding hole; 132, connecting slot; 14, second outer cylinder; 1314, feeding balun; 1314a, first feeding balun; 1314b, second feeding balun; 141, second feeding hole; 201, strip line circuit; 2011, second connecting part; 202, first cavity; 203, second cavity; 204, common top plate; 205, through hole; 3, feed core; 3a, second feed core; 3b, first feed core; 31, first feed section; 32, second feed section; 33, third feed section; 34, fourth feed section; 35, fifth feed section; 36, first connecting part; 100, radiation unit; 200, phase shifter. DETAILED DESCRIPTION

[0032] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the scheme of the present application will be further described below. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0033] In the following description, many specific details are set forth to facilitate a full understanding of the present application, but the present application may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only part of the embodiments of the present application, rather than all of the embodiments.

[0034] like Figure 1 and Figure 2As shown, it is a feeding structure of a vertical cavity, that is, the plane where the stripline circuit 201 in the cavity 2 is located is perpendicular to the bottom surface of the radiation unit.

[0035] Figure 1 Schematic diagram of the connection between the feed core 3 of the radiation unit and the strip line circuit 201 in the cavity 2. The plane where the strip line circuit 201 is located is in the vertical direction. The plane where the feed core 3 is located and the plane where the strip line circuit is located are at an angle β (angle setting: 0°<β<180°), so in practical applications, the electrical connection between the two is difficult to achieve.

[0036] In addition, the distance between the two feed cores of the high-frequency radiation unit in the industry is 8mm-15mm. When the radiation unit is fastened by screws and other parts, screw holes need to be set on the cavity 2. The screw holes will penetrate the common side walls of the left and right sub-cavities and affect the performance and layout of the strip line circuit 201 in the cavity 2. Therefore, it is necessary to increase the width of the cavity 2 in the horizontal direction, that is, Figure 1 The spacing in the AA direction shown in FIG. As the spacing between the two sub-cavities 2 increases, the spacing between the feed cores of the radiation unit needs to be increased accordingly. This is not only not conducive to miniaturization design, but also requires substantial modification and optimization of the radiation unit.

[0037] To this end, an embodiment of the present application provides a radiation unit and a base station antenna, which forms a first connection portion by bending the end of the feed core, thereby changing the spacing between the two feed cores in the radiation unit and being able to adapt to the connection with a wider cavity. At the same time, the angle between the first connection portion and the strip line in the cavity can be reduced, thereby reducing the difficulty of electrical connection between the two and improving the connection quality.

[0038] Specifically, Figures 3 to 9 As shown, the radiation unit 100 provided in the embodiment of the present application includes a radiation component 1, a feed balun 1314 and a feed core 3. The radiation component 1 is supported on the feed balun and electrically connected to the feed balun 1314. The feed balun 1314 has a first feeding hole 131. The feed core 3 is inserted into the first feeding hole 131, and one end of the feed core 3 is electrically connected to the feed balun 1314, and the other end passes through the first feeding hole 131 and is bent to form a first connecting portion 36. The first connecting portion 36 is used to be electrically connected to the strip line circuit 201 in the phase shifter 200.

[0039] In some embodiments, the feed balun 1314 is arranged along a direction perpendicular to the plane where the radiation component 1 is located, and the first feed hole 131 is arranged along a direction perpendicular to the plane where the radiation component 1 is located, and the first connection portion 36 passes through an end of the first feed hole 131 away from the radiation component 1, so that the first connection portion 36 is located outside the first feed hole 131. Therefore, when the structure and size of the radiation component 1 remain unchanged, by setting the bending direction and bending angle of the first connection portion 36, the spacing between the positive electrode feed core 3 and the negative electrode feed core 3 can be adjusted to adapt to the connection of cavities 2 of different widths, and by adjusting the bending direction and bending angle of the first connection portion 36, the angle between the first connection portion 36 and the strip line in the cavity 2 can be reduced, thereby reducing the difficulty of electrical connection and improving the connection quality.

[0040] In some embodiments of the present application, the radiating component 1 includes a first dipole 1a and a second dipole 1b arranged orthogonally, wherein the first dipole 1a includes two first radiating arms 11, and the second dipole 1b includes two second radiating arms 12, that is, the first dipole 1a corresponds to one pair of diagonally arranged two first radiating arms 11, responsible for electromagnetic signals in one polarization direction (for example, +45°); the second dipole 1b corresponds to another pair of diagonally arranged two second radiating arms 12, responsible for electromagnetic signals in another polarization direction (for example, -45°).

[0041] The feeding balun 1314 includes two first feeding baluns 1314a and two second feeding baluns 1314b. The two first feeding baluns 1314a are respectively supported under the two first radiating arms 11 and are respectively connected to the two first radiating arms 11 for feeding; the two second feeding baluns 1314b are respectively supported under the two second radiating arms 12 and are respectively connected to the two second radiating arms 12 for feeding.

[0042] The number of the feed cores 3 is two, namely, the first feed core 3b and the second feed core 3a, the first feed core 3b is arranged in a first feed hole 131 of a first feed balun 1314a, wherein one end of the first feed core 3b is bent to form a connecting portion and passes through the first feed hole 131, and the other end of the first feed core 3b is electrically connected to another first feed balun feed 1314a; specifically, in some embodiments of the present application, the upper end of the first feed core 3b passes through the first feed hole 131 and spans the two The first feed balun 1314a is feed-connected to another first feed balun 1314a. The first feed core 3b is feed-connected to the first feed balun 1314a by the first feed core 3b penetrating into the first feed balun 1314a and connecting to the first feed balun 1314a, or by not penetrating into the first feed balun 1314a and directly connected to the first feed balun 1314a by direct current. The lower end of the first feed core 3b is bent to form a first connecting portion 36 and passes through the first feeding hole 131.

[0043] The second feed core 3a has the same structure as the first feed core 3b, and the connection structure between the first feed core 3b and the first feed balun 1314a is the same as the connection structure between the second feed core 3a and the second feed balun 1314b, so they are not described in detail. In the following, the first feed core 3b and the first feed balun 1341a will be taken as an example for explanation.

[0044] In some embodiments of the present application, the first feed core 3b includes a first feed segment 31, a second feed segment 32, a third feed segment 33 and a first connecting portion 36 which are arranged in sequence, the first feed segment 31 and the third feed segment 33 are respectively connected to the two ends of the second feed segment 32, the first connecting portion 36 is arranged at one end of the third feed segment 33 away from the second feed segment 32, and the first connecting portion 36 includes a fourth feed segment 34 and a fifth feed segment 35, the fourth feed segment 34 is bent relative to the third feed segment 33, and the fifth feed segment 35 is bent relative to the fourth feed segment 34.

[0045] For example, Figure 4 As described, in some embodiments of the present application, the second feeding segment 32 spans over two first feeding baluns 1314a, the first feeding segment 31 is electrically connected to one of the first feeding baluns 1314a, the third feeding segment 33 is arranged in the first feeding hole 131 of the other first feeding balun, the fourth feeding segment 34 is bent relative to the third feeding segment 33 and extends from the first feeding hole 131, and the fifth feeding segment 35 is bent relative to the fourth feeding segment 34 and is used to be electrically connected to the stripline circuit 201 in the cavity 2.

[0046] like Figure 6As shown, the first feeding section 31, the second feeding section 32, the third feeding section 33 and the fourth feeding section 34 are in the first plane, and the fifth feeding section 35 is in the second plane, wherein an angle β2 is formed between the first plane and the second plane, 0°<β2<180°.

[0047] In some embodiments of the present application, the feeding balun 1314 includes a first outer cylinder 13 and a second outer cylinder 14, a first feeding hole 131 is formed inside the first outer cylinder 13, and a second feeding hole 141 is formed inside the second outer cylinder 14, the first outer cylinder 13 and the second outer cylinder 14 are arranged adjacent to each other, and a connecting groove 132 is provided on the side wall of the first outer cylinder 13, the connecting groove 132 connects the first feeding hole 131 and the second feeding hole 141, and the first connecting portion 36 penetrates from the connecting groove 132 into the second feeding hole 141.

[0048] The axial direction of the first outer cylinder 13 is parallel to the axial direction of the second outer cylinder 14, the third feeding segment 33 is inserted into the first feeding hole 131, the fourth feeding segment 34 and the fifth feeding segment 35 are inserted into the second feeding hole 141 from the connecting groove, wherein the fifth feeding segment 35 extends along the axial direction of the second feeding hole 141, and the lower end of the fifth feeding segment 35 passes through the second feeding hole 141 and is exposed outside the second outer cylinder 14, so as to facilitate electrical connection with the strip line circuit 201 in the cavity 2.

[0049] Specifically, in some embodiments of the present application, the connecting groove 132 is arranged along the axial direction of the first outer cylinder 13, and extends from one end of the first outer cylinder 13 to the other end of the first outer cylinder 13, that is, the connecting groove 132 is opened in the entire length direction of the first outer cylinder 13, so that the feeding core 3 can be inserted into the feeding balun from above the radiation component 1 for installation.

[0050] The feed balun 1314 is coaxially arranged with the feed core 3, and the two together constitute a transmission structure similar to a coaxial line. The first feed hole 131 and the second feed hole 141 are arranged in a through manner. The first outer cylinder 13 and the second outer cylinder 14 are integrally formed by processes such as die casting. Exemplarily, the connecting groove 132 is realized by grooving or slitting. Preferably, the width of the groove is between 1mm-2mm. The connecting groove 132 is set to a uniform width. Alternatively, the gap width is increased only near the gap through which the feed core 3 passes.

[0051] The first feed hole 131 and the second feed hole 141 are connected through the connecting slot 132. Exemplarily, the connecting slot 132 is a slit or a slot. Therefore, when assembling the radiation unit 100 assembly, the feed core 3 can be passed from the top of the radiation component 1 downward, and after the feed core 3 passes through the first feed hole 131 and the second feed hole 141, it is fastened in the feed balun through a plastic clip (not shown in the figure).

[0052] Further, in some embodiments of the present application, the second outer cylinder 14 is connected to the side wall of the end of the first outer cylinder 13 away from the radiation component 1. The length of the second outer cylinder 14 is greater than or equal to the width of the fourth feeding segment 34, and less than the length of the fifth feeding segment 35, so that the fourth feeding segment 34 is always located in the feeding balun, and the lower end of the fifth feeding segment 35 can extend out of the feeding balun to connect with the strip line circuit 201 in the cavity 2.

[0053] In some embodiments of the present application, the cross-sectional shape of the first feeding hole 131 is one of a circle, an ellipse, a rectangle or an oval. Figure 4 and Figure 5 As shown, the cross-sectional shape of the first feeding hole 131 is circular. Figure 8 and Fig. 9 As shown, the cross-sectional shape of the first feeding hole 131 is a rectangle.

[0054] In some embodiments of the present application, the cross-sectional shape of the second feeding hole 141 is one of a circle, an ellipse, a rectangle or an oval. Figure 4 and Figure 5 As mentioned above, the cross-sectional shape of the second feeding hole 141 is circular. Figure 8 and Fig. 9 As shown, the cross-sectional shape of the second feeding hole 141 is a rectangle.

[0055] like Fig.10 As shown, in some embodiments of the present application, the base station antenna provided in the embodiments of the present application includes a reflector, a phase shifter 200 and a radiation unit 100 as described in any of the above embodiments, the radiation unit 100 and the phase shifter 200 are respectively arranged on both sides of the reflector, the phase shifter 200 includes a cavity 2 and a stripline circuit 201 arranged in the cavity 2, the stripline circuit 201 has a second connection portion 2011, the second connection portion 2011 is arranged perpendicular to the reflector, a through hole is provided at a position on the cavity 2 corresponding to the second connection portion 2011, the first connection portion 36 extends from the through hole into the cavity 2 and is electrically connected to the second connection portion, and the position where the first connection portion 36 is connected to the second connection portion 2011 is arranged parallel to the second connection portion 2011.

[0056] Exemplarily, the cavity 2 of the phase shifter 200 has two independent chambers, namely the first chamber 202 and the second chamber 203. In order to avoid the provision of screw holes on the cavity 2 affecting the performance and layout of the stripline circuit 201 in the cavity 2, the horizontal width of the cavity 2 is increased. Specifically, in some embodiments of the present application, the phase shifter 200 has two cavities, and the two cavities are connected by a common top plate 204. In actual engineering applications, the radiation unit can be fastened to the common top plate by fasteners such as screws and / or plastic clips, or the radiation unit can be fixed to the common top plate by a laser welding process.

[0057] A through hole 205 is provided at a position of the upper wall of the cavity 2 corresponding to the second connection part 2011, for allowing the first connection part 36 to pass through, or the second outer cylinder 14 to pass through. The bottom of the second outer cylinder 14 can be inserted into the cavity 2, leaving a gap with the side wall of the cavity 2. Alternatively, the bottom of the second outer cylinder 14 is located above the upper surface of the cavity 2, and does not contact the upper surface of the cavity 2.

[0058] In some embodiments of the present application, the first connection portion 36 is in the shape of a sheet, and the second connection portion is in the shape of a sheet. The first connection portion 36 and the second connection portion are arranged parallel and in close contact with each other so that the two can be stably electrically connected.

[0059] It should be noted that, in some embodiments of the present application, the stripline circuit 201 may be at least one of a phase shift circuit, a filter circuit or a power division circuit.

[0060] When assembling the base station antenna, the stripline circuit 201 can be first inserted into the phase shifter cavity 2, the radiation component 1, the feed balun and the cavity 2 are connected by screws, and finally the feed core 3 is assembled. The electrical connection between the feed core 3 and the stripline circuit 201 can be welding or coupling connection, and the connection method is not limited.

[0061] In some embodiments of the present application, a welding operation hole is provided on the side of the cavity 2 for welding the first connection part 36 and the second connection part 2011. The welding operation hole can be connected to the through hole 205 to form a hole with an L-shaped cross-section, or it can be disconnected.

[0062] The base station antenna in the embodiment of the present application can be a single-frequency antenna, and the cavity can be used as a reflector, or a reflector can be set separately. Exemplarily, the cavity is set on the back side of the reflector, and the radiation unit is set on the front side of the reflector. The base station antenna of the present application can also be applied to multi-frequency or MIMO antenna arrays.

[0063] The feed core of the radiating unit is directly electrically connected to the strip line circuit in the cavity, reducing the use of cables in the antenna array. Moreover, the cavity does not require electroplating. The strip line circuit and the feed core use a laser welding process and do not require electroplating. Therefore, the base station antenna provided in the embodiment of the present application complies with the national green and low-carbon environmental protection strategy. Moreover, the feed core of the radiating unit and the strip line in the cavity form a stacked flat structure, which simplifies the electrical connection process, brings convenience to welding, and improves manufacturability.

[0064] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0065] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments described herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A radiation unit, characterized in that: The invention comprises a radiation component (1), a feeding balun (1314) and a feeding core (3); the radiation component (1) is supported on the feeding balun (1314) and electrically connected to the feeding balun (1314); the feeding balun (1314) has a first feeding hole (131); the feeding core (3) is inserted into the first feeding hole (131), one end of the feeding core (3) is electrically connected to the feeding balun (1314), and the other end is inserted from the first feeding hole (131) and bent to form a first connecting portion (36); the first connecting portion (36) is used to be electrically connected to a strip line circuit (201) in a phase shifter.

2. The radiation unit according to claim 1, characterized in that: The feed core (3) comprises a first feed segment (31), a second feed segment (32), a third feed segment (33) and a first connecting portion (36) which are arranged in sequence; the first feed segment (31) and the third feed segment (33) are respectively connected to two ends of the second feed segment (32); the first connecting portion (36) is arranged at an end of the third feed segment (33) away from the second feed segment (32); and the first connecting portion (36) comprises a fourth feed segment (34) and a fifth feed segment (35); the fourth feed segment (34) is bent relative to the third feed segment (33); and the fifth feed segment (35) is bent relative to the fourth feed segment (34).

3. The radiation unit according to claim 2, characterized in that: The plane where the fifth feeding section (35) is located and the plane where the fourth feeding section (34) is located are arranged at an angle.

4. The radiation unit according to claim 2, characterized in that: The feeding balun (1314) comprises a first outer cylinder (13) and a second outer cylinder (14); the first outer cylinder (13) forms the first feeding hole (131) inside, and the second outer cylinder (14) forms the second feeding hole (141) inside; the first outer cylinder (13) and the second outer cylinder (14) are arranged adjacent to each other, and a connecting groove (132) is provided on the side wall of the first outer cylinder (13); the connecting groove (132) connects the first feeding hole (131) and the second feeding hole (141); and the first connecting portion (36) penetrates from the connecting groove (132) into the second feeding hole (141).

5. The radiation unit according to claim 4, characterized in that: The communicating groove (132) is arranged along the axial direction of the first outer cylinder (13), and extends from one end of the first outer cylinder (13) to the other end of the first outer cylinder (13).

6. The radiation unit according to claim 4, characterized in that: The second outer cylinder (14) is connected to a side wall of the first outer cylinder (13) at an end away from the radiation component (1).

7. The radiation unit according to claim 4, characterized in that: The radiating component (1) comprises a first dipole (1a) and a second dipole (1b) arranged orthogonally, the first dipole (1a) comprises two first radiating arms (11), and the second dipole (1b) comprises two second radiating arms (12); the feeding balun (1314) comprises two first feeding baluns (1314a) and two second feeding baluns (1314b), the two first feeding baluns (1314a) are respectively connected to the first radiating arms (11), and the two second feeding baluns (1314b) are respectively connected to the two second radiating arms (12); The number of the feed cores (3) is two, namely a first feed core (3b) and a second feed core (3a); one end of the first feed core (3b) is connected to a first feed balun (1314a) for feeding, and the other end of the first feed core (3b) is inserted into the first feed hole (131) and the second feed hole (141) of another first feed balun (1314a); one end of the second feed core (3a) is connected to a second feed balun (1314b) for feeding, and the other end of the second feed core (3a) is inserted into the first feed hole (131) and the second feed hole (141) of another second feed balun (1314b).

8. The radiation unit according to claim 4, characterized in that: The cross-sectional shape of the first feeding hole (131) is one of circular, elliptical, rectangular or oval; and / or the cross-sectional shape of the second feeding hole (141) is one of circular, elliptical, rectangular or oval.

9. A base station antenna, characterized in that: The invention comprises a reflecting plate, a phase shifter and a radiation unit according to any one of claims 1 to 7, wherein the radiation unit and the phase shifter are arranged on both sides of the reflecting plate; the phase shifter comprises a cavity (2) and a stripline circuit (201) arranged in the cavity (2), the stripline circuit (201) having a second connecting portion (2011), a through hole (205) is provided on the cavity (2) at a position corresponding to the second connecting portion (2011), the first connecting portion (36) extends from the through hole (205) into the cavity (2) to be electrically connected to the second connecting portion (2011), and the position where the first connecting portion (36) is connected to the second connecting portion (2011) is arranged parallel to the second connecting portion (2011).

10. The base station antenna according to claim 8, characterized in that: The first connecting portion (36) is in the shape of a sheet, the second connecting portion (2011) is in the shape of a sheet, and the first connecting portion (36) and the second connecting portion (2011) are arranged parallel to and in close contact with each other.

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