Dual-polarized antenna

Abstract

The invention belongs to the technical field of antennas, and relates to a dual-polarized antenna, which comprises a first dielectric layer, a second dielectric layer and a floor layer which are sequentially arranged at intervals from top to bottom, parasitic patches are arranged on the upper surface of the first dielectric layer and are distributed in an axial symmetry mode and a central symmetry mode at the same time. The upper surface of the second dielectric layer is provided with a radiation patch and three auxiliary patches, and the lower surface of the second dielectric layer is provided with three radiation patches and one auxiliary patch; the four radiation patches are respectively positioned in four quadrants and are distributed in a central symmetry manner; the four auxiliary patches are in one-to-one correspondence with the four radiation patches respectively; and the two opposite radiation patches are connected with one feed structure to form a dipole, and the two dipoles are crossed and perpendicular to each other. According to the invention, dual polarization can be realized, the structure is simple, and the reliability is good.

Description

Technical Field

[0001] This application relates to the field of antenna technology, and particularly to a dual-polarized antenna. Background Art

[0002] An antenna, as an indispensable part of a wireless communication system, plays a key role in converting electromagnetic signals and electrical signals into each other, and is a bridge connecting the information world and the physical world. Its importance lies not only in being the starting and ending points of signal transmission, but also in that the optimization of its performance has a decisive impact on improving the overall performance of the wireless communication system. Characteristics such as the gain, directivity, and polarization mode of the antenna directly determine key indicators such as the signal transmission distance, coverage range, anti-interference ability, and system capacity of the signal. By precisely designing and adjusting the antenna parameters, the signal transmission efficiency can be significantly enhanced, the coverage range can be expanded, and the stability and reliability of the system can be improved.

[0003] With the rapid development of wireless communication technology, antenna technology is also constantly innovating. The application of advanced technologies such as multi-antenna technology and beamforming has further improved the spectral efficiency, data transmission rate, and coverage range of the communication system, providing strong support for building a more efficient, intelligent, and secure wireless communication network. Therefore, the research and application of antennas are of great significance for promoting the development of wireless communication technology and improving system performance.

[0004] A dual-polarized antenna is a new type of antenna technology. It combines two antennas with orthogonal polarization directions of +45° and -45°, and works in a transceiver duplex mode at the same time, significantly saving the number of antennas of a single directional base station, improving the isolation degree, reducing the call loss and interference, increasing the polarization diversity gain, and effectively improving the stability and reliability of the communication system.

[0005] In the prior art, the implementation form of the dual-polarized antenna is relatively complex, with high cost and poor reliability. Summary of the Invention

[0006] Based on this, in view of the above technical problems, it is necessary to provide a dual-polarized antenna that can achieve dual polarization, has a simple structure, good reliability, can effectively reduce the mutual influence between two dipoles, reduce the isolation degree between two ports, ensure that the two ports can work independently, and have less mutual interference.

[0007] A dual-polarized antenna includes: a first dielectric layer, a second dielectric layer, and a floor layer that are sequentially arranged at intervals from top to bottom; A parasitic patch is provided on the upper surface of the first dielectric layer, and the parasitic patch is simultaneously axially symmetrically distributed and centrosymmetrically distributed; On the upper surface of the second dielectric layer, there is a radiation patch and three auxiliary patches, and on the lower surface of the second dielectric layer, there are three radiation patches and one auxiliary patch; the four radiation patches are respectively located in four quadrants and are centrosymmetrically distributed; the four auxiliary patches respectively correspond to the four radiation patches one by one; two opposite radiation patches are connected to a feeding structure to form a dipole, and the two dipoles cross perpendicularly.

[0008] In one embodiment, the parasitic patch includes: a first part, a plurality of second parts, and a plurality of third parts, and the plurality of second parts correspond to the plurality of third parts one by one; The first part is a circular structure and is arranged at the center of the first dielectric layer; The second part is a strip structure and connects the first part and the corresponding third part; The third part is an arc structure, and all the third parts form a discontinuous circular ring structure.

[0009] In one embodiment, a rectangular parasitic slot is arranged at the position on the first part corresponding to between two second parts.

[0010] In one embodiment, the second part includes a first section and a second section; The first section is connected to the first part, and the second section is connected to the third part; The length of the first section is greater than the length of the second section, and the width of the first section is less than the width of the second section.

[0011] In one embodiment, the radiation patch is an axisymmetric structure and includes: a first component, a second component, and a third component; The first component is an isosceles trapezoid structure, and the upper base of the isosceles trapezoid structure is connected to the opposite radiation patch; The second component is a rectangular structure, one long side is collinear with the lower base of the first component, and the other long side coincides with the longest side of the third component; The third component is a hexagonal structure.

[0012] In one embodiment, the auxiliary patch is an axisymmetric triangular structure and includes: a first side, a second side, and a third side; The first side is a straight line structure and is perpendicular to a diagonal of the second dielectric layer; both the second side and the third side are wavy line structures, and the corner formed by the second side and the third side faces the center of the second dielectric layer.

[0013] In one embodiment, two first grooves are arranged on the auxiliary patch in an axially symmetric and spaced manner, and the length direction of the first groove is parallel to the direction of the first side.

[0014] In one embodiment, two second grooves are symmetrically arranged at intervals on the auxiliary patch. The length direction of the second grooves is parallel to the direction of the first side. The length of the second grooves is less than the length of the first groove, so that the first groove is arranged between the first side and the second grooves.

[0015] In one embodiment, a first microstrip line and a second microstrip line are further provided on the second dielectric layer; One end of the first microstrip line is connected to the radiation patch on the upper surface of the second dielectric layer, and the other end is connected to the inner conductor of the first feeding structure. The outer conductor of the first feeding structure is connected to the first radiation patch on the lower surface of the second dielectric layer; One end of the second microstrip line is connected to the second radiation patch on the lower surface of the second dielectric layer, and the other end is connected to the inner conductor of the second feeding structure. The outer conductor of the second feeding structure is connected to the third radiation patch on the lower surface of the second dielectric layer.

[0016] In one embodiment, the feeding structure includes: two coaxial cables, which are respectively connected to two dipoles.

[0017] The above-mentioned dual-polarized antenna realizes ±45° dual polarization. Compared with a single-polarized antenna, it can transmit and receive signals in two polarization forms, effectively improving the utilization rate of the antenna; at the same time, it improves the isolation degree between the two ports of the antenna, reduces the mutual interference between the two ports, reduces the mutual influence between the two polarizations, enables the two ports of the antenna to work independently, and is beneficial to the stability of the communication system operation; it also improves the impedance matching of the antenna and expands the bandwidth, and can receive and transmit a variety of signals; in addition, the antenna structure is simple, light in weight, small in size, convenient for transportation and carrying, reduces the processing cost, and can be widely applied to fields such as wireless communication, base stations, and the Internet of Things. Description of the Drawings

[0018] Figure 1 Is a perspective view of a dual-polarized antenna in one embodiment; Figure 2 Is a front view of a dual-polarized antenna in one embodiment; Figure 3 Is a top view of the first dielectric layer of a dual-polarized antenna in one embodiment; Figure 4 Is a perspective view of the second dielectric layer of a dual-polarized antenna in one embodiment; Figure 5 Is a top view of the second dielectric layer of a dual-polarized antenna in one embodiment; Figure 6 Is a bottom view of the second dielectric layer of a dual-polarized antenna in one embodiment; Figure 7 The bottom view of the ground plane of a dual-polarized antenna in one embodiment; Figure 8 The feeding schematic diagram of a dual-polarized antenna in one embodiment; Figure 9 For the S of a dual-polarized antenna in one embodiment 11 Schematic diagram of parameter curve; Figure 10 For the S of a dual-polarized antenna in one embodiment 22 Schematic diagram of parameter curve; Figure 11 For the S of a dual-polarized antenna in one embodiment 12 Schematic diagram of parameter curve; Figure 12 Schematic diagram of the gain curve of port 1 of a dual-polarized antenna in one embodiment; Figure 13 Schematic diagram of the gain curve of port 2 of a dual-polarized antenna in one embodiment; Figure 14 The planar radiation pattern of port 1 of a dual-polarized antenna at 1.3 GHz in one embodiment; Figure 15 The planar radiation pattern of port 1 of a dual-polarized antenna at 1.4 GHz in one embodiment; Figure 16 The planar radiation pattern of port 1 of a dual-polarized antenna at 1.5 GHz in one embodiment; Figure 17 The planar radiation pattern of port 2 of a dual-polarized antenna at 1.3 GHz in one embodiment; Figure 18 The planar radiation pattern of port 2 of a dual-polarized antenna at 1.4 GHz in one embodiment; Figure 19 The planar radiation pattern of port 2 of a dual-polarized antenna at 1.5 GHz in one embodiment.

[0019] Reference numerals: The first dielectric layer 1; parasitic patch 2, the first part 21, the second part 22, the third part 23, parasitic slot 24; the second dielectric layer 3; radiation patch 4, the first component 41, the second component 42, the third component 43; auxiliary patch 5, the first side 51, the second side 52, the third side 53, the first groove 54, the second groove 55; ground plane 6; the first microstrip line 71, the second microstrip line 72, metal via 73, coaxial cable 74, feeding point 75. Detailed implementation manners

[0020] In order to make the objectives, technical solutions and advantages of the present application more clear and understandable, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the protection scope of the present application.

[0021] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present application are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0022] In addition, in the present application, descriptions such as "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, the meaning of "multiple groups" is at least two groups, such as two groups, three groups, etc., unless otherwise specifically and clearly defined.

[0023] In the present application, unless otherwise clearly specified and limited, terms such as "connection" and "fixation" shall be understood in a broad sense. For example, "fixation" may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, a physical connection or a wireless communication connection; it may be directly connected or indirectly connected through an intermediate medium, and may be the internal connection of two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0024] In addition, the technical solutions between various embodiments of the present application can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present application.

[0025] The present application provides a dual-polarized antenna. As Figures 1 to 7 shown, in one embodiment, it includes: a first dielectric layer, a second dielectric layer, and a floor layer. The first dielectric layer, the second dielectric layer, and the floor layer are sequentially arranged at intervals and parallel to each other from top to bottom. It should be noted that the specific manner of arranging at intervals and parallel to each other belongs to the prior art.

[0026] A parasitic patch is provided on the upper surface of the first dielectric layer, and the parasitic patch is simultaneously axially symmetrically distributed and centrally symmetrically distributed.

[0027] On the upper surface of the second dielectric layer, there is a radiation patch and three auxiliary patches, and on the lower surface of the second dielectric layer, there are three radiation patches and one auxiliary patch; the four radiation patches are located in four quadrants respectively and are centrosymmetrically distributed; the four auxiliary patches correspond to the four radiation patches one by one; two opposite radiation patches are connected to a feeding structure to form a dipole, and the four radiation patches form two dipoles, and the two dipoles cross perpendicularly. The above settings can effectively reduce the mutual influence between the two dipoles, reduce the isolation between the two ports, ensure that the two ports can work independently with less mutual interference; the antenna realizes ±45° polarization, and can transmit and receive signals in two polarization forms compared with a single-polarization antenna, effectively improving the utilization efficiency of the antenna.

[0028] The floor layer is used for grounding.

[0029] Preferably, the parasitic patch includes: a first part, a plurality of second parts and a plurality of third parts, and the plurality of second parts correspond to the plurality of third parts one by one; the first part is a circular structure and is arranged at the center of the first dielectric layer; the second part is a strip structure connecting the first part and the corresponding third part; the third part is an arc structure, and all the third parts form a discontinuous circular ring structure. The above settings of the parasitic patch can effectively improve the gain of the antenna, enhance the ability of the antenna to transmit signals, and improve the communication quality of the communication system.

[0030] Further preferably, a rectangular parasitic slot is arranged at the position between two corresponding second parts on the first part to change the current flow path on the parasitic patch, so that the current is more concentrated in the radiation area of the antenna, thereby optimizing the energy distribution and reducing unnecessary losses. At the same time, by destroying the propagation path of surface waves and reducing the generation of parasitic resonance, the energy loss is significantly reduced, and the antenna gain is further improved.

[0031] Even more preferably, the second part includes a first section and a second section; one end of the first section is connected to one end of the second section, the other end of the first section is connected to the first part, and the other end of the second section is connected to the third part; the length of the first section is greater than the length of the second section, and the width of the first section is less than the width of the second section. The above settings reduce the generation of scattering and interference through the transitional shape, thereby improving the net radiation efficiency of the antenna and further improving the antenna gain.

[0032] Even more preferably, the number of the parasitic slots, the second parts and the third parts is six, and the six second parts are evenly spaced on the edge of the first part to further improve the antenna gain.

[0033] In one embodiment, the radiation patch is an axisymmetric structure, including: a first component, a second component, and a third component; the first component is an isosceles trapezoid structure, and the upper base of the isosceles trapezoid structure is connected to the opposite radiation patch; the second component is a rectangular structure, one long side of which is collinear with the lower base of the first component and the length of the long side is less than the length of the lower base of the first component, and the other long side coincides with the longest side of the third component; the third component is a hexagonal structure with unequal side lengths. The above settings can generate additional resonant frequencies, and the multiple resonant frequencies are superimposed, thereby expanding the bandwidth of the antenna.

[0034] In one embodiment, the auxiliary patch is an axisymmetric triangular structure, including: a first side, a second side, and a third side; the first side is a straight line structure and is perpendicular to a diagonal of the second dielectric layer; both the second side and the third side are wavy line structures, and the angular ends formed by the second side and the third side face the center of the second dielectric layer. With the above settings of the auxiliary patch, it can act together with the parasitic patch to change the current distribution on the radiation patch of the antenna and the electric field direction at different phases, effectively improving the impedance matching of the antenna, further expanding the bandwidth of the antenna, receiving and transmitting more signals, and improving the antenna utilization rate.

[0035] Preferably, two first grooves are symmetrically arranged at intervals on the auxiliary patch, and the length direction of the first grooves is parallel to the direction of the first side, so that stronger radiation is formed at the edges of the first grooves by the current, enabling better matching of the characteristic impedance of the antenna, thereby reducing signal reflection and energy loss, improving the energy transmission efficiency, and further expanding the bandwidth of the antenna.

[0036] Further preferably, two second grooves are also symmetrically arranged at intervals on the auxiliary patch, and the length direction of the second grooves is parallel to the direction of the first side, and the length of the second grooves is less than the length of the first grooves, so that the first grooves are arranged between the first side and the second grooves, causing the current density to change, thereby optimizing the original resonant characteristics and further improving the impedance matching.

[0037] Even more preferably, the first grooves and the second grooves are rectangular strip structures with equal widths, and convex parts are provided at both ends of the first grooves and the second grooves. The convex parts are right trapezoid structures, and one right angle of the convex parts is provided on the right angle of the first groove or the second groove close to the first side, and the lower base of the convex parts coincides with the short side of the first groove or the second groove, so as to further expand the bandwidth of the antenna.

[0038] In one embodiment, a first microstrip line and a second microstrip line are further provided on the second dielectric layer. The first microstrip line and the second microstrip line are perpendicularly arranged and are respectively connected to a dipole. Specifically: one end of the first microstrip line is connected to the radiation patch on the upper surface of the second dielectric layer, and the other end is connected to the inner conductor of the first feeding structure. The outer conductor of the first feeding structure is connected to the first radiation patch on the lower surface of the second dielectric layer. One end of the second microstrip line is connected to the second radiation patch on the lower surface of the second dielectric layer, and the other end is connected to the inner conductor of the second feeding structure. The outer conductor of the second feeding structure is connected to the third radiation patch on the lower surface of the second dielectric layer. Among them, the first microstrip line is arranged on the upper surface of the second dielectric layer. The second microstrip line includes: a first line and a second line. The first line is arranged on the lower surface of the second dielectric layer, and the second line is arranged on the upper surface of the second dielectric layer. One end of the first line is connected to one end of the second line through a metal via perpendicular to the second dielectric layer. The other end of the first line is connected to the second radiation patch on the lower surface of the second dielectric layer, and the other end of the second line is connected to the third radiation patch on the lower surface of the second dielectric layer. The above settings make the feeding of the two dipoles not coincide, effectively isolate the two mutually perpendicular dipoles, and thus optimize the dual-polarization characteristics.

[0039] In one embodiment, the feeding structure includes: two coaxial cables, which are respectively connected to the two dipoles. Specifically: the inner conductors of the two coaxial cables are respectively connected to the first microstrip line and the second microstrip line on the upper surface of the second dielectric layer, and the outer conductors are respectively connected to the first radiation patch and the third radiation patch on the lower surface of the second dielectric layer.

[0040] In this embodiment, the antenna uses microstrip lines to feed the two dipoles respectively (the feeding points are as Figure 8 shown), achieving ±45° polarization. The input impedance of the feeding port is 50 ohms, which is matched with the SMA interface, facilitating connection with test equipment for antenna testing.

[0041] The above dual-polarization antenna realizes ±45° dual polarization. Compared with a single-polarization antenna, it can transmit and receive signals in two polarization forms, effectively improving the utilization rate of the antenna. At the same time, it improves the isolation degree between the two ports of the antenna, reduces the mutual interference between the two ports, reduces the mutual influence between the two polarizations, enables the two ports of the antenna to work independently, and is beneficial to the stability of the communication system operation. It also improves the impedance matching of the antenna and expands the bandwidth, and can receive and transmit various signals. In addition, the antenna structure is simple, with light weight, small volume, convenient for transportation and carrying, reduces the processing cost, and can be widely applied in the fields of wireless communication, base stations, Internet of Things, etc.

[0042] In a specific embodiment, the sizes of the two dielectric layers are both 270*120mm 2, both the first dielectric layer and the second dielectric layer are made of PCB material, with a dielectric constant of 4, a loss tangent tanδ = 0.005, and a thickness of 0.8 mm.

[0043] The electromagnetic full-wave simulation software CST is used to simulate, analyze, and optimize the above antenna. The structural parameters, S 11 parameters, S 22 parameters, S 12 parameters, gain, and radiation pattern are studied.

[0044] As Figure 9 shows the schematic diagram of the S 11 parameters curve of the antenna. The S 11 parameters are all below -10 dB in the range of 1.29 GHz - 1.59 GHz. The relative bandwidth of the antenna is 20.8%, which proves that the antenna has a relatively wide frequency band. Compared with ordinary narrow-band antennas, it can receive and transmit signals in more frequency bands, has a wide application range, and a high utilization rate.

[0045] As Figure 10 shows the schematic diagram of the S 22 parameters curve of the antenna. The S 22 parameters are all below -10 dB in the range of 1.23 GHz - 1.70 GHz. The relative bandwidth of the antenna is 35.3%, which proves that the antenna has a relatively wide frequency band and the bandwidth difference from S 11 is not significant, indicating that the mutual influence between the two ports of the antenna is small.

[0046] As Figure 11 shows the schematic diagram of the S 12 parameters curve of the antenna. The S 12 parameters are all below -20 dB in the range of 1.20 GHz - 1.72 GHz, which proves that the antenna has good isolation and the two ports can work independently.

[0047] Figure 12 shows the schematic diagram of the gain curve of antenna port 1. It can be seen that the gain of the antenna remains above 5 dBi between 1.2 GHz and 1.7 GHz, and can reach up to about 7.9 dBi at most, which proves that the antenna has good radiation performance and can receive signals from a long distance.

[0048] Figure 13 shows the schematic diagram of the gain curve of antenna port 2. It can be seen that the gain of the antenna remains above 6 dBi between 1.2 GHz and 1.7 GHz, and can reach up to about 7.8 dBi at most, which proves that the antenna has good radiation performance and can be well applied in base station communication.

[0049] Figures 14 to 16The planar radiation pattern of antenna port 1 at different frequencies within the operating frequency band is given. It can be seen that the radiation pattern of the antenna exhibits directional radiation characteristics, and the antenna radiates in the +Z-axis direction.

[0050] Figures 17 to 19 The planar radiation pattern of antenna port 2 at different frequencies within the operating frequency band is given. It can be seen that the radiation pattern of the antenna exhibits directional radiation characteristics, demonstrating that the antenna radiates in the +Z-axis direction.

[0051] The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0052] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as within the scope described in this specification.

[0053] The above-described embodiments merely represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A dual-polarized antenna, characterized in that: include: A first medium layer, a second medium layer and a floor layer are arranged in sequence from top to bottom; A parasitic patch is provided on the upper surface of the first dielectric layer, and the parasitic patch is distributed in both axisymmetric and center-symmetrical distribution; A radiation patch and three auxiliary patches are provided on the upper surface of the second dielectric layer, and three radiation patches and one auxiliary patch are provided on the lower surface of the second dielectric layer; the four radiation patches are respectively located in four quadrants and are centrally symmetrically distributed; the four auxiliary patches correspond one to one with the four radiation patches respectively; the two opposite radiation patches are connected to a feeding structure to form a dipole, and the two dipoles are crossed and perpendicular.

2. A dual-polarized antenna according to claim 1, characterized in that: The parasitic patch includes: a first portion, a plurality of second portions, and a plurality of third portions, wherein the plurality of second portions correspond to the plurality of third portions one by one; The first part is a circular structure and is located at the center of the first dielectric layer; The second part is a strip-shaped structure, connecting the first part and corresponding to the third part; The third part is an arc-shaped structure, and all the third parts form a discontinuous circular ring structure.

3. A dual-polarized antenna according to claim 2, characterized in that: A rectangular parasitic groove is provided on the first part at a position corresponding to the position between the two second parts.

4. A dual-polarized antenna according to claim 3, characterized in that: The second part includes a first paragraph and a second paragraph; The first section is connected to the first portion, and the second section is connected to the third portion; The length of the first segment is greater than the length of the second segment, and the width of the first segment is smaller than the width of the second segment.

5. A dual-polarized antenna according to any one of claims 1 to 4, characterized in that: The radiation patch is an axisymmetric structure, comprising: a first component, a second component and a third component; The first component is an isosceles trapezoidal structure, and the upper base of the isosceles trapezoidal structure is connected to the opposite radiation patch; The second component is a rectangular structure, one long side of which is collinear with the lower base of the first component, and the other long side of which coincides with the longest side of the third component; The third component is a hexagonal structure.

6. A dual-polarized antenna according to any one of claims 1 to 4, characterized in that: The auxiliary patch is an axisymmetric triangular structure, including: a first side, a second side and a third side; The first side is a straight line structure and is perpendicular to a diagonal line of the second dielectric layer; the second side and the third side are both wavy line structures, and the corner formed by the second side and the third side faces the center of the second dielectric layer.

7. A dual-polarized antenna according to claim 6, characterized in that: The auxiliary patch is provided with two first grooves which are symmetrically arranged with an axis of separation, and the length direction of the first groove is parallel to the direction of the first side.

8. A dual-polarized antenna according to claim 7, characterized in that: The auxiliary patch is also provided with two second grooves symmetrically arranged at intervals, the length direction of the second groove is parallel to the direction of the first edge, and the length of the second groove is smaller than the length of the first groove, so that the first groove is arranged between the first edge and the second groove.

9. A dual-polarized antenna according to any one of claims 1 to 4, characterized in that: The second dielectric layer is also provided with a first microstrip line and a second microstrip line; One end of the first microstrip line is connected to the radiation patch on the upper surface of the second dielectric layer, and the other end is connected to the inner conductor of the first feeding structure, and the outer conductor of the first feeding structure is connected to the first radiation patch on the lower surface of the second dielectric layer; One end of the second microstrip line is connected to the second radiation patch on the lower surface of the second dielectric layer, and the other end is connected to the inner conductor of the second feeding structure. The outer conductor of the second feeding structure is connected to the third radiation patch on the lower surface of the second dielectric layer.

10. A dual-polarized antenna according to any one of claims 1 to 4, characterized in that: The feeding structure includes: two coaxial cables, which are respectively connected to two dipoles.

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