Dual polarization antenna

Abstract

A dual-polarized antenna comprises a radiation unit consisting of four conductive elements, four supporting elements, a feeding unit and a reflecting plate; a cross opening groove at the center of the radiation unit separates the four conductive elements from each other, the top ends of the four supporting elements are connected to the conductive elements, and the four supporting elements are fixed on the reflecting plate; the feeding unit comprises a printed circuit board placed in the center area of ​​the radiation unit and two coaxial cables placed along the supporting elements, connected to a conductive layer covering the lower surface of the printed circuit board through an outer conductor, and connected to the first ends of two strip lines located on the upper surface of the printed circuit board through an inner conductor, the conductive layer on the printed circuit board and the two strip lines and the two coaxial cables form two matching circuits matching the radiation unit; the conductive layer covering the lower surface of the printed circuit board comprises a cross opening groove, dividing the conductive layer into four parts, which are placed corresponding to the four conductive elements; the strip line passes through the cross opening groove, and the second end is connected to a coupling element.

Description

Field of the Invention

[0001] The present invention relates to a dual-polarization antenna, and in particular, to an antenna capable of transmitting / receiving two orthogonal polarizations in vertical and horizontal directions or at an inclination angle of + / -45 degrees. Background Art

[0002] Today, when smartphones are widely used, the market needs a large number of dual-polarized antennas. Therefore, a lot of manpower and material resources have been invested in this field to develop antennas with specified beam width, good cross-polarization discrimination, and good matching with feed cables through wide bandwidth, and these antennas are easy to produce.

[0003] Because crossed dipoles produce beams that are too wide in the horizontal plane, more complex radiators were invented to reduce the beamwidth. U.S. Patent US5940044 describes a dual slant polarized antenna with a half-power beamwidth of approximately 65 degrees in the horizontal plane. The antenna includes multiple arrays of dipoles, each subarray including four dipoles arranged in a rhombus (diamond shape). U.S. Patents US6333720B1, US6529172B2, and US2010 / 0309084A1 contain diagrams of other radiators with dipole square shapes. The balun of the dipole is tilted to the center of the dipole square array to simplify manufacturing, but despite this new shape, these devices are still complex to make.

[0004] US Patent US6313809B1 describes a dual polarization radiator (dual polarization radiator) comprising four dipoles, which are evenly arranged above the reflector and are a dipole square array type from a top view. Such dipoles are described in US6940465B2, US7688271B2, CN202423543U, CN202268481U, CN101916910A, CN102097677A, CN102694237A, CN710714, and CN717214. Most known dual polarization radiators of dipole square arrays are excited by four coaxial cables, which are welded to the radiator through their inner and outer conductors, such as the dual polarization antenna described in patent CN102013560A.

[0005] The first drawback of the known dual-polarized antenna is the complicated feeding network, which includes four cables connecting four dipoles and a beam forming network, which is usually placed on the other side of the reflector. Most of these cables are connected in parallel with another cable connected to the beam forming network. The second drawback is that since the feeding cables are directly connected to the dipoles, the operating band is limited, resulting in this antenna having no matching circuit between the dipole and the feeding cable. In addition, the aluminum radiator must be covered with a tin film to solder the cables. The need to use a tinning process is the third drawback, because tinning of large radiators increases the manufacturing cost. Summary of the invention

[0006] The object of the present invention is to overcome the shortcomings of the prior art and other known dual-polarized antennas.

[0007] Based on the prior art mentioned above, the first purpose of the present invention is to develop a broadband dual-polarized antenna that is simply connected to a beamforming network. The second purpose is to reduce the manufacturing cost of large antennas operating at frequencies below 1 GHz. The third purpose is to reduce the back radiation of the dual-polarized antenna.

[0008] The present invention provides a dual-polarized antenna, comprising a radiation unit consisting of four conductive elements, four supporting elements, a feeding unit and a reflecting plate; wherein a cross-opening groove at the center of the radiation unit separates the four conductive elements from each other, the tops of the four supporting elements are directly connected to the conductive elements one by one, and the bottoms of the four supporting elements are fixed to the reflecting plate; wherein the feeding unit comprises a printed circuit board and two coaxial cables placed in the central area of ​​the radiation unit on the upper surface of the conductive element, the two coaxial cables are placed along the supporting element, and are connected to a conductive layer covering the lower surface of the printed circuit board through an outer conductor, and are connected to the first ends of two strip lines located on the upper surface of the printed circuit board through their inner conductors, the conductive layer on the printed circuit board and the two strip lines and the two coaxial cables form two matching circuits matching the radiation unit; wherein the conductive layer covering the lower surface of the printed circuit board comprises a cross-opening groove, the cross-opening groove divides the conductive layer into four parts, which are placed corresponding to the four conductive elements of the radiation unit; wherein the strip line passes through the cross-opening groove at the center of the cross-opening groove, and the second end of the strip line is connected to a coupling element.

[0009] The reflective plate includes a cross-shaped open slot disposed between the bottom ends of the support elements.

[0010] Figure 1-15 Some embodiments of a dual-polarized antenna are shown.

[0011] Compared with conventional solutions, the dual-polarized antenna according to the present invention provides a wider frequency band, as a result of which the feeding element includes a matching circuit connected between the radiating device and the feeding coaxial cable. Therefore, by adjusting the size of the stripline forming the matching circuit, the dual-polarized antenna can be better matched with the feeding coaxial cable over a wide frequency band.

[0012] Compared with conventional solutions, the dual-polarized antenna according to the present invention can have the advantage of less back radiation, as a result of which the cross-opening slots in the reflective plate between the bottom ends of the support elements generate additional radiation in the back direction, thereby suppressing the back radiation generated by the radiating unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a side view of a first embodiment of a dual-polarized antenna according to the present invention, wherein the radiating element is composed of two crossed dipoles, and the two crossed dipoles are excited by a feeding unit on a dipole arm located on the surface of a supporting element above a reflecting plate.

[0014] Figure 2 yes Figure 1 A diagrammatic side view of a portion of a dual polarized antenna shown in FIG.

[0015] Figure 3 is a side view of another dipole arm and support element.

[0016] Figures 4a-4f The top and bottom views of the printed circuit board include strip lines forming the matching circuit and coupling elements of different forms.

[0017] Figure 5 1 is a side view of another embodiment of a dual-polarized antenna, wherein each arm of the cross dipole comprises two side metal pieces and a middle metal piece connecting the side metal pieces, and the reflector comprises a cross-shaped open slot between the supporting elements.

[0018] Figure 6 It is a side view of another embodiment of a dual-polarized antenna, wherein each cross dipole arm comprises two side metal pieces connected to a supporting element, and an additional metal piece is connected to the two side metal pieces and separated by a dielectric film.

[0019] Figure 7 is a side view of another embodiment of a dual-polarized antenna, wherein the radiating unit comprises four dipoles arranged in a dipole square array, excited by a feeding unit and connected to a symmetry line formed by a conductor and an adjacent conductive support element.

[0020] Figure 8 It is a side view of another embodiment of a dual-polarized antenna, in which the dipole arms are arranged in a dipole array and are bent from the plane where the symmetry line is located to point to the direction of the reflector.

[0021] Fig. 9 This is a side view of another example of a dual-polarized antenna. The dipole arms are arranged in a dipole array and are bent from the plane of the symmetry line, away from the reflector.

[0022] Fig.10 is a side view of another embodiment of a dual-polarized antenna, wherein the arms of each dipole are fed by a symmetry line, and the arms are bent toward the center of the radiating element and away from the direction of the reflector.

[0023] Fig.11 yes Fig.10 A side view of a portion of a radiating element is shown, made from a piece of metal plate.

[0024] Fig.12 It is a side view of another embodiment of a dual-polarized antenna, wherein the radiating unit comprises four folded dipoles arranged in a dipole square array, connected to a symmetry line, and excited by a feeding unit.

[0025] Fig.13 This is another side view of the dual-polarized antenna. The conductor at the end of the folded dipole arm is bent from the plane where the symmetry line is located and is directed toward the reflector.

[0026] Fig.14 It is a side view of another embodiment of a dual-polarized antenna, wherein the folded dipole includes a dielectric element and is bent from the plane where the symmetry line is located and away from the direction of the reflector.

[0027] Fig.15 is a side view of another embodiment of a dual-polarized antenna, wherein the support element and the radiating element including four folded dipoles are made of a metal plate. DETAILED DESCRIPTION

[0028] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the general description of the invention given below, serve to explain the principles of the invention.

[0029] Figure 1It is a side view of the first embodiment of the dual-polarized antenna of the present invention. The present invention provides a dual-polarized antenna including a radiating unit, the radiating unit including four conductive elements 1-4, which are independently separated by a cross-opening slot 5 at the center of the radiating unit, the top ends of four supporting elements 6a-6d are directly connected to the conductive elements, and the bottom ends are connected to and fixed on the reflector 7, and also includes a feeding unit. The feeding unit includes a printed circuit board 8 placed in the middle of the radiating unit and located on the upper surface of the conductive elements 1-4, and two coaxial cables 9a and 9b placed along the supporting elements 6a and 6b, and the coaxial cables 9a and 9b are connected to the conductive layer covering the bottom surface of the printed circuit board 8 through the outer conductor. The inner conductors 10a and 10b of the coaxial cables 9a and 9b are connected to the first ends 11a and 11b of the strip conductors 12a and 12b placed on the upper surface of the printed circuit board 8, and the conductive layer on the printed circuit board 8 and the strip conductors 12a and 12b form two matching circuits matching the radiating unit with the coaxial cables 9a and 9b. The coupling elements 13a and 13b generate capacitive coupling between the second ends of the strip conductors 12a and 12b and the conductive element 3, so when the coaxial cable 9a is excited, the first radiation unit formed by the conductive elements 1 and 3 radiates electromagnetic waves. The E vector of the radiated first electromagnetic wave points along the arrow Ea. When the coaxial cable 9b is excited, the second radiation unit formed by the conductive elements 2 and 4 radiates electromagnetic waves. The E vector of the radiated second electromagnetic wave points along the arrow Eb and is perpendicular to the arrow Ea. Therefore, the dual-polarization antenna according to the present invention radiates two electromagnetic waves with orthogonal polarizations.

[0030] The shape of the radiation beam depends on the shape of the radiating element.The provided dual polarized antenna may comprise different kinds of radiating elements. Figure 1 The conductive elements 1-4 shown form two crossed dipoles. The support elements 6a-6d form two crossed dipoles of these dipoles. The support element 6a is Figure 2 A portion of a conductive element 1 (dipole arm) is shown, and the conductive element 1 (dipole arm) comprises two side metal pieces 14a and 14b.

[0031] Another configuration of the dipole arms and support elements is Figure 3 As shown, its side metal pieces 15a and 15b have a straight shape. The metal parts 16a and 16b at its edges are bent downward to increase the coupling between the cross-dipole arms. The metal parts 17a and 17b at the edge of the support element 18 are bent to increase the coupling with the coaxial cable arranged along the support element 18 and to increase the suppression of the leakage wave propagating along the outer conductor of the coaxial cable. The cross dipole having arms of this shape can be used as a low-band radiating element of a dual-band antenna because a space is provided between the low-band and high-band radiating elements.

[0032] Figure 4a and4b They are Figure 1 The printed circuit board 8 is shown in top and bottom views. The strip conductors 12a and 12b placed on the upper surface of the printed circuit board 8 form coupling elements 13a and 13b in the shape of rectangular plates and two matching circuits. The metallized hole 19 connects the strip conductor 12b to the strip conductor 20 arranged at the bottom surface of the printed circuit board 8. The metallized hole 21 connects the strip conductor 20 to the coupling element 13b. The conductive layer covering the bottom of the printed circuit board includes a cross-shaped opening groove 22, which divides the conductive layer into four parts 23a-23d, which are respectively placed on the opposite sides of the four conductive elements 1-4. The strip conductor 20 is arranged in the center of the cross-shaped opening groove 22. The branches of the cross-shaped opening groove 22 are arranged on the opposite sides of the branches of the cross-shaped opening groove 5. The printed circuit board 8 is fixed to the conductive elements 1-4 arranged in the holes 24 by plastic screws or rivets (not shown).

[0033] The impedance of a radiating element depends on its shape and operating frequency band, so the strip conductors forming the matching circuit and the coupling elements of different radiating elements have different configurations and may include different components.

[0034] Figure 4c and 4d 2 are respectively a top view and a bottom view of another embodiment of the present invention, wherein the printed circuit board 25 includes coupling elements 26a and 26b of open-circuit branches, which produce a short circuit near the cross-opening slot 22. The coupling elements 26a and 26b connect the strip conductors 27a and 27b to the portions 23d and 23c of the conductive layer covering the bottom surface of the printed circuit board 25, respectively. This frequency-dependent connection produces an attenuation pole at a higher frequency. The short-circuit branches 28a and 28b act as matching elements within the operating frequency band and produce an attenuation pole at a higher frequency. Therefore, the coupling elements 26a and 26b and the short-circuit branches 28a and 28b can form a filter that suppresses the electromagnetic wave radiation of a frequency band that is about twice higher than the operating frequency band. Therefore, this configuration of the matching circuit can be used for the low-band radiator of the dual-band antenna.

[0035] Figure 4e and 4f 1 is a top view and a bottom view of another embodiment of the present invention, wherein a printed circuit board 30 wherein strip conductors 31a and 31b form a matching circuit including short-circuited stubs 32a and 32b. A cross-opening slot 34 divides the conductive layer into four portions 35a-35d. Metallized holes 33a and 33b connect the ends of stubs 32a and 32b to portions 35a and 35b, respectively. An inner conductor of a coaxial cable is connected to a first end of the strip conductors 31a and 31b. Coupling elements in the shape of metallized holes 36a and 36b connect the second ends of the strip conductors to portions 35c and 35d, respectively. An outer conductor of the coaxial cable is connected to portions 35a and 35b.

[0036] The matching circuit may also contain other components to match different radiating elements to the feed coaxial cable. The provided dual polarized antenna is well matched to the feed coaxial cable and can therefore be directly connected to a printed circuit board containing power dividers, filters and other components of the matching circuit. In order to be able to add more components to the matching circuit, the size of the dielectric substrate can be increased.

[0037] Figure 5 FIG. 1 is a diagrammatic side view of another embodiment of a dual polarized antenna, in which each arm of the cross dipole is composed of two side metal pieces 37a and 37b connected to a support element 38 and an intermediate metal piece 39 connected to the side metal pieces 37a and 37b. The matching of the dipole with the intermediate metal piece 39 to the coaxial cable is better than that shown in FIG. Figure 1-3 The matching of the dipole without intermediate metal parts and the coaxial cable shown in the figure. The printed circuit board 40 is larger in size than the printed circuit board 8, and its corners are arranged at the branches opposite to the cross-opening slot 41. The coupling elements 42a and 42b have a triangular shape. The dielectric film 43 is arranged between the bottom end of the support element 38 and the reflector to prevent the generation of passive intermodulation products. The reflector 44 includes a cross-opening slot 45 arranged between the bottom ends of the support elements. The cross-opening slot 45 excited by the support element generates additional radiation at the back. Compared with the radiation from the radiating element, this radiation has a different phase, and the radiating element diffuses backward around the reflector 44, so the radiation from the cross-opening slot 45 partially suppresses the back radiation generated by the radiating element and improves the front-to-back ratio of the described dual-polarization antenna.

[0038] Figure 6 1 is a side view of another embodiment of a dual-polarized antenna, wherein the arms of the cross dipoles include side metal pieces 46a and 46b, which are connected to a support element 47. The additional metal piece 48 is an independent element separated from the side metal piece by a dielectric film 49. Figure 5 Compared to the intermediate metal piece 39 shown, this shape of the intermediate metal piece 48 does not limit the length of the support element 47. Figure 6 The support element 47 in the embodiment can be longer. The cross dipole placed above the reflector provides a wider beam width and better matching with the feed coaxial cable.

[0039] Figure 71 is a side view of another embodiment of a dual polarized antenna, in which a printed circuit board 50 is disposed in the middle of the radiating element, and is composed of four dipoles 51a-51d arranged in a dipole array shape and connected to symmetry lines 52a-52d, which are formed by metal conductors connected to adjacent support elements 53a-53d. The symmetry lines 52a-52d are part of the matching circuit on the printed circuit board 50. A feeding coaxial cable (not shown) is connected to strip conductors 54a and 54b disposed on the upper surface of the printed circuit board 50. The radiating element of the dipole square array type provides a narrower beam width, so this antenna provides more gain compared to the crossed dipole.

[0040] Figure 8 1 is a side view of another embodiment of a dual polarized antenna, wherein the arms of the dipoles 55a-55d arranged in a dipole array are tilted from the plane where the symmetry lines 56a-56d are arranged, and are oriented toward the reflector. This tilting of the dipoles 55a-55d increases the gain and improves the front-to-back value of the dual polarized antenna.

[0041] Fig. 9 1 is a side view of another embodiment of a dual-polarized antenna, in which the arms of the dipoles 57a-57d arranged in a dipole array are bent 90 degrees from the plane where the symmetry lines 58a-58d are located and are directed toward the reflector. This shape increases the length of the symmetry lines 58a-58d and the distance between the dipoles 57a-57d and the reflector, improving the matching of the dual-polarized antenna with the coaxial cable (not shown) connected to the strip conductors 59a and 59b.

[0042] Fig.10 1 is a side view of another embodiment of a dual-polarized antenna, in which the arms of the dipoles 60a-60d are bent 90 degrees from the plane where the symmetry lines 61a-61d are located, away from the direction of the reflector, and toward the center of the radiating element. The outer contour of this radiating element looks like an octagon. This shape increases the length of the symmetry lines 61a-61d and the distance between the dipoles 60a-60d and the reflector, improving the matching of the dual-polarized antenna with the coaxial cable (not shown) connected to the strip conductors 62a and 62b.

[0043] Fig.11 yes Fig.10 A side view of a portion of a radiating element is shown, which is stamped from a piece of metal sheet, making the antenna very cheap to manufacture.

[0044] Fig.12FIG. 1 is a side view of another embodiment of a dual-polarized antenna, wherein the radiating element is composed of four folded dipoles 63a-63d arranged in a dipole formation and connected to the symmetry line excited by the feed element. The strip conductors 64a-64d connecting the ends of the folded dipoles increase the impedance of the dipoles, so that the symmetry lines 65a-65d of the feed folded dipoles are aligned with the symmetry lines 65a-65d of the feed folded dipoles. Figure 7-10 The strip conductors 66a and 66b have a greater impedance than the symmetry lines of the conventional dipoles shown in FIG. The gap between their conductors is larger, so the impedance is less dependent on production tolerances. Coaxial cables (not shown) are connected to the strip conductors 66a and 66b, which together with the symmetry lines 65a-65d form a matching circuit.

[0045] Fig.13 FIG. 1 is a side view of another embodiment of a dual-polarized antenna, in which the strip conductors 67a-67d connecting the ends of the folded dipoles are tilted from the plane where the symmetry lines 68a-68d and the dipoles 69a-69d lie, and point in the direction of the reflector. The radiating element with the tilted strips 67a-67d is more robust than Fig.12 The radiating element shown is of smaller size.

[0046] Fig.14 is a side view of another embodiment of a dual-polarized antenna, in which the folded dipoles 71a-71d are bent from the plane where the symmetry line is located and away from the direction of the reflector. The dielectric element 72 is arranged between the arms of the folded dipoles 71a-71d, and the dielectric element 73 is arranged between the ends of adjacent folded dipoles to maintain the size of the symmetry line and increase the durability of the radiating element.

[0047] Fig.15 is a diagrammatic side view of another embodiment of a dual polarized antenna, wherein the support element and the radiating element including four folded dipoles are stamped from a piece of metal. The folded dipoles are bent from the plane where the symmetry line lies and point in the direction of the reflector to improve the front-to-back ratio and increase the gain.

[0048] Radiating elements with different shapes provide different radiation patterns, so the dual-polarized antenna according to the present invention can be used to create different antenna arrays.

[0049] Compared with conventional solutions, the dual-polarized antenna according to the present invention provides a wider frequency band, and the feeding element includes a matching circuit connected between the radiating element and the feeding coaxial cable. Therefore, by adjusting the size of the strip line forming the matching circuit, the dual-polarized antenna can be well matched with the feeding coaxial cable through a wide frequency band.

[0050] The manufacturing cost of the dual-polarized antenna according to the invention is lower than that of conventional solutions, since all elements of the radiating element and the supporting element do not need to be tinned and can be made from aluminum sheets by stamping.

[0051] Compared with conventional solutions, the dual-polarized antenna according to the present invention provides less back radiation, and the cross-open slots in the reflective plate between the bottom ends of the support elements generate additional radiation in the back direction, thereby suppressing the back radiation generated by the radiating unit.

[0052] Although the present invention has been illustrated by the description of its embodiments, and although the embodiments have been described in detail, it is not the intention of the applicant to limit or in any way restrict the scope of the appended claims to such details. The additional advantages of the present invention and some modifications made will be more easily understood by those skilled in the art. Therefore, the present invention description is more broadly not limited to the specific details, representative devices and illustrative examples shown and described. Therefore, these details may be deviated from without departing from the spirit or scope of the applicant's overall inventive concept.

Claims

1. A dual-polarized antenna, characterized in that: It comprises a radiation unit consisting of four conductive elements, four supporting elements, a feeding unit and a reflecting plate; The cross opening slot at the center of the radiation unit separates the four conductive elements from each other, the tops of the four supporting elements are directly connected to the conductive elements one by one, and the bottoms of the four supporting elements are fixed on the reflecting plate; The feeding unit comprises a printed circuit board placed in the central area of ​​the radiation unit on the upper surface of the conductive element and two coaxial cables, the two coaxial cables are placed along the supporting element, and are connected to the conductive layer covering the lower surface of the printed circuit board through the outer conductor, and are connected to the first ends of two strip lines located on the upper surface of the printed circuit board through the inner conductor, and the conductive layer and the two strip lines on the printed circuit board and the two coaxial cables form two matching circuits matching the radiation unit; The conductive layer on the lower surface of the printed circuit board includes a cross-shaped opening groove, which divides the conductive layer into four parts and is placed corresponding to the four conductive elements of the radiation unit; wherein the stripline on the printed circuit board passes through the cross opening slot at the center of the cross opening slot, and the second end of the stripline is connected to the coupling element; The dielectric film is placed between the reflector and the bottom of the support element; The reflector plate includes a cross-shaped opening slot located between the bottoms of the support elements.

2. The dual-polarized antenna according to claim 1, wherein: The matching circuit includes an open stub line.

3. The dual-polarized antenna according to claim 1, wherein: The matching circuit includes a short-circuited stub line.

4. The dual-polarized antenna according to claim 1, wherein: A portion of the stripline passing through the cross-opening slot of the conductive layer is located on the lower surface of the printed circuit board and is connected to the stripline through a metallized hole on the printed circuit board.

5. The dual-polarized antenna according to claim 1, wherein: The coupling element disposed on the upper surface of the printed circuit board is in the form of a conductive plate.

6. The dual-polarized antenna according to claim 1, characterized in that: The coupling element has the form of a stripline with open ends.

7. The dual-polarized antenna according to claim 1, characterized in that: The coupling element on the printed circuit board has the form of a metallized hole.

8. The dual-polarized antenna according to claim 1, wherein: The radiating element consists of two crossed dipoles.

9. The dual-polarized antenna according to claim 8, characterized in that: Each arm of the crossed dipole comprises two side metal pieces connected to a support element.

10. The dual-polarized antenna according to claim 8, characterized in that: Each arm of the crossed dipole comprises two side metal pieces connecting the support element and an intermediate metal piece connecting the side metal pieces.

11. The dual-polarized antenna according to claim 10, characterized in that: The dielectric film is placed between the middle metal piece and the side metal pieces.

12. The dual-polarized antenna according to claim 1, wherein: The radiating element comprises four dipoles placed above a reflector and arranged in a dipole array.

13. The dual-polarized antenna according to claim 12, characterized in that: Each dipole is connected to a line of symmetry formed by conductors connected to adjacent support elements.

14. The dual-polarized antenna according to claim 13, characterized in that: The dipole is in the same plane as the line of symmetry.

15. The dual-polarized antenna according to claim 13, characterized in that: The dipole is bent 30-90 degrees from the plane of the symmetry line and faces the direction of the reflector.

16. The dual-polarized antenna according to claim 13, characterized in that: The dipole is bent 30-90 degrees from the plane of the symmetry line and away from the direction of the reflector.

17. The dual-polarized antenna according to any one of claims 12 to 16, characterized in that: The arms of each dipole bend toward the center of the radiating element.

18. The dual-polarized antenna according to any one of claims 8 to 16, characterized in that: All parts of the support element and the radiating element to which it is connected are stamped from a single piece of metal sheet.

19. The dual-polarized antenna according to claim 1, wherein: The radiation unit includes four folded dipoles placed above the reflector and arranged in a dipole array.

20. The dual-polarized antenna according to claim 19, characterized in that: Each folded dipole is connected to a symmetry line formed by two conductors connected to two adjacent support elements.

21. The dual-polarized antenna according to claim 20, characterized in that: Each folded dipole is in the same plane as the line of symmetry.

22. The dual-polarized antenna according to claim 20, characterized in that: The terminal conductor of the folded dipole is bent from the plane where the symmetry line is located and is directed toward the reflector.

23. The dual-polarized antenna according to claim 20, characterized in that: The folded dipole is bent 30-90 degrees from the plane where the symmetry line is located and faces the direction of the reflector.

24. The dual-polarized antenna according to claim 20, characterized in that: The folded dipole is bent 30-90 degrees from the plane where the symmetry line is located and away from the direction of the reflector.

25. The dual-polarized antenna according to any one of claims 19 to 24, characterized in that: The support element and the radiating element are stamped from the same metal plate.

26. The dual-polarized antenna according to any one of claims 19 to 24, wherein the dielectric element is placed between adjacent gaps at the ends of the dipole.

27. A dual-polarization antenna array, comprising at least two dual-polarization antennas according to claim 1.

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