Cross dipole antenna

Abstract

The invention belongs to the technical field of antennas, and relates to a cross dipole antenna, which comprises a metasurface layer, a radiation layer and a floor layer, the metasurface layer is connected with the floor layer, and an accommodating space is formed between the metasurface layer and the floor layer; the radiation layer is arranged in the accommodating space and connected with the floor layer, and the radiation layer and the metasurface layer are arranged at intervals; the radiation layer comprises two pairs of crossed dipoles; two feed structures are arranged on the floor layer and are respectively connected with the two pairs of crossed dipoles; the radiation layer comprises a dielectric plate and four radiation patches which are symmetrically distributed at intervals about the center of the dielectric plate; the dielectric plate and the radiation patch are both of a square structure, and one side of the radiation patch is parallel to one side of the dielectric plate; the two radiation patches are adjacently arranged on the top surface of the dielectric plate, and the other two radiation patches are adjacently arranged on the bottom surface of the dielectric plate; and the two opposite radiation patches are connected to serve as a dipole. The profile of the antenna can be reduced.

Description

Technical Field

[0001] The present application relates to the field of antenna technology, and in particular to a cross-dipole antenna. Background Art

[0002] In modern wireless communication systems, dual-polarization antennas can provide polarization diversity to reduce the side effects of multipath fading and increase channel capacity, and are therefore widely used in base stations and other scenarios.

[0003] There are many different researches on dual-polarized base station antennas, which can be roughly divided into: patch antennas, conventional dipole antennas, magneto-electric dipole antennas and cross-dipole antennas. Among them, cross-dipole antennas are widely designed and applied due to their simple structure, high working bandwidth and good radiation performance.

[0004] In the prior art, the structure of the traditional cross-dipole antenna uses a metal ground plane as a reflector; due to the reflective characteristics of the metal surface, the height of the antenna is usually around 0.25λ, where λ is the wavelength of the center operating frequency. Base station antennas mainly operate in two frequency bands, namely the lower frequency band (0.69-0.96 GHz) and the higher frequency band (1.7-2.7 GHz). Therefore, it can be seen that the normal height of a base station antenna operating at 690MHz-960MHz is about 90mm.

[0005] However, with the rapid development of mobile communication systems today, this height is too cumbersome in many cases and cannot meet the strict requirements for a low profile of base stations. Summary of the invention

[0006] Based on this, it is necessary to provide a cross-dipole antenna to reduce the cross-section of the antenna in order to solve the above technical problems.

[0007] A cross dipole antenna, comprising: a super surface layer, a radiation layer and a floor layer; The super surface layer is connected to the floor layer, and a containing space is formed between the super surface layer and the floor layer; The radiation layer is arranged in the accommodation space, connected to the floor layer, and spaced apart from the super surface layer; the radiation layer includes: two pairs of crossed dipoles; Two feeding structures are arranged on the floor layer and are respectively connected to two pairs of cross dipoles.

[0008] In one embodiment, the radiation layer includes: a dielectric plate and four radiation patches that are symmetrically distributed with respect to the center of the dielectric plate; The dielectric plate and the radiation patch are both square structures, and one side of the radiation patch is parallel to one side of the dielectric plate; Two radiation patches are adjacently arranged on the top surface of the dielectric plate, and another two radiation patches are adjacently arranged on the bottom surface of the dielectric plate; the two opposite radiation patches are connected to form a dipole.

[0009] In one embodiment, a group of diagonal portions of the radiation patch are symmetrically provided with isosceles right triangle-shaped grooves, so that the radiation patch forms a hexagonal structure, and all the radiation patches form a "cross" structure.

[0010] In one embodiment, the ratio of the right-angle side length of the slot, the side length of the radiation patch, and the side length of the dielectric plate is 1:3:9. In one embodiment, the radiation layer further comprises: four metal pillars serving as radiation arms; The metal column is a regular quadrangular prism structure, one corresponding end of which is connected to the dielectric plate and has a gap with the radiation patch, and the other corresponding end of which is connected to the floor layer.

[0011] In one embodiment, the height of the metal column is 3.5 to 4 times the distance between the radiation layer and the super surface layer.

[0012] In one embodiment, the radiation layer further comprises: a first connecting member and a second connecting member corresponding to the two dipoles respectively; The first connecting member comprises: a first connecting patch of a strip structure; the first connecting patch is arranged on the top surface of the dielectric plate, one end of the first connecting patch is directly connected to a radiation patch of the corresponding dipole, and the other end is connected to another radiation patch of the corresponding dipole through a feeding structure; The second connecting member includes: a second connecting patch, a third connecting patch and a fourth connecting patch of a strip structure; the second connecting patch is arranged on the top surface of the dielectric plate, one end of which is directly connected to a radiation patch of the corresponding dipole, and the other end is connected to the fourth connecting patch through a connecting tube; the third connecting patch is arranged on the top surface of the dielectric plate, one end of which is connected to another radiation patch of the corresponding dipole through another feeding structure, and the other end is connected to the fourth connecting patch through a connecting tube; the fourth connecting patch is arranged on the bottom surface of the dielectric plate, and both ends are connected to the other end of the second connecting patch and the other end of the third connecting patch through connecting tubes respectively.

[0013] In one embodiment, the length directions of the second connection patch, the third connection patch and the fourth connection patch are the same, and the length direction of the second connection patch is used as the length direction of the second connector; The length direction of the second connecting member is perpendicular to the length direction of the first connecting member and intersects at the center of the dielectric plate.

[0014] In one embodiment, the supersurface layer comprises: a substrate and a plurality of supersurface units with square structures; A plurality of the super-surface units are arranged at intervals on the top surface of the substrate to form a square array.

[0015] In one embodiment, the feeding structure comprises: an outer conductor and an inner conductor, wherein a separator is provided between the outer conductor and the inner conductor; One end of the outer conductor and one end of the inner conductor are connected to an external feeding end, the other end of the outer conductor is connected to a radiation patch arranged on the bottom surface of the dielectric plate, and the other end of the inner conductor is connected to a radiation patch arranged on the top surface of the dielectric plate.

[0016] The above-mentioned cross-dipole antenna is a dual-polarized cross-dipole antenna based on a metasurface. It overcomes the problem of deterioration of the radiation pattern after lowering the antenna height in the prior art. It has the characteristics of low profile and high performance. It does not reduce the profile at the cost of performance, but ensures high performance while reducing the profile, so that the antenna has superior performance and ensures good and stable antenna radiation performance. It is widely used in base station communications, base station antennas, broadband antennas, dual-polarized antennas, wireless communication systems, Internet of Things, Internet of Vehicles and other fields, especially scenarios involving low-profile base station communication environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a three-dimensional structural diagram of a cross-dipole antenna in one embodiment; Figure 2 is a side view of a cross-dipole antenna in one embodiment; Figure 3 A schematic diagram of a super surface layer structure of a cross dipole antenna in one embodiment; Figure 4 is a schematic diagram of a radiation layer structure of a cross-dipole antenna in one embodiment; Figure 5 A schematic diagram of a connection structure of a cross-dipole antenna in an embodiment; Figure 6 is an S-parameter curve diagram of a cross-dipole antenna in one embodiment; Figure 7 is a gain curve diagram of a cross-dipole antenna in one embodiment; Figure 8 is a radiation pattern of a port 1 of a cross-dipole antenna in a horizontal plane at 690 MHz in one embodiment; Fig. 9 is a radiation pattern of a vertical plane of port 1 of a cross-dipole antenna at 690 MHz in one embodiment; Fig.10is a radiation pattern of port 1 of a cross-dipole antenna in a horizontal plane at 800 MHz in one embodiment; Fig.11 is a radiation pattern of a port 1 of a cross-dipole antenna in a vertical plane at 800 MHz in one embodiment; Fig.12 is a radiation pattern of a port 1 of a cross-dipole antenna in a horizontal plane at 960 MHz in one embodiment; Fig.13 is a radiation pattern of a port 1 of a cross-dipole antenna in a vertical plane at 960 MHz in one embodiment; Fig.14 is a radiation pattern of a port 2 of a cross-dipole antenna in a horizontal plane at 690 MHz in one embodiment; Fig.15 is a radiation pattern of a port 2 of a cross-dipole antenna in a vertical plane at 690 MHz in one embodiment; Fig.16 is a radiation pattern of port 2 of a cross-dipole antenna in a horizontal plane at 800 MHz in one embodiment; Fig.17 is a radiation pattern of a port 2 of a cross-dipole antenna in a vertical plane at 800 MHz in one embodiment; Fig.18 is a radiation pattern of a port 2 of a cross-dipole antenna in a horizontal plane at 960 MHz in one embodiment; Fig.19 is a radiation pattern of a port 2 of a cross-dipole antenna in a vertical plane at 960 MHz in one embodiment; Fig. 20 is a surface current diagram of port 1 of a cross-dipole antenna radiated at 690 MHz in one embodiment; Fig.21 is a surface current diagram of port 2 of a cross-dipole antenna radiated at 690 MHz in one embodiment; Fig. 22 is a surface current diagram of port 1 of a cross-dipole antenna radiated at 800 MHz in one embodiment; Fig.23 is a surface current diagram of port 2 of a cross-dipole antenna radiated at 800 MHz in one embodiment; Fig.24 is a surface current diagram of port 1 of a cross-dipole antenna radiated at 960 MHz in one embodiment; Fig.25 FIG. 1 is a surface current diagram of port 2 of a cross-dipole antenna radiating at 960 MHz in one embodiment.

[0018] Reference numerals: Super surface layer 1, substrate 11, super surface unit 12, non-metallic column 13; Radiation layer 2, dielectric plate 21, radiation patch 22, metal column 23; Floor layer 3, first probe 31, second probe 32, connecting pipe 33; The first connection patch A, the second connection patch B, the third connection patch C, and the fourth connection patch D. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with 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 intended to limit the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0020] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0021] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "multiple groups" means at least two groups, such as two groups, three groups, etc., unless otherwise clearly and specifically defined.

[0022] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, a physical connection, or a wireless communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0023] In addition, the technical solutions between the various embodiments of the present application can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0024] The present application provides a cross-dipole antenna, such as Figures 1 to 5 As shown, in one embodiment, it includes: a super surface layer, a radiation layer and a floor layer.

[0025] Among them, the super surface layer, the radiation layer and the floor layer are arranged in sequence from top to bottom.

[0026] The super surface layer is arranged above the floor layer in parallel and is connected to the floor layer through four non-metallic columns; a containing space is formed between the super surface layer and the floor layer, so that a radiation layer is arranged in the containing space.

[0027] Preferably, the supersurface layer includes: a substrate and a plurality of supersurface units; the supersurface units are of a square structure, and the plurality of supersurface units are arranged at intervals on the top surface of the substrate to form a square array, so as to reduce the antenna profile while ensuring performance.

[0028] The radiation layer is arranged in parallel above the floor layer and in parallel below the super surface layer, that is, the radiation layer is arranged in parallel between the super surface layer and the floor layer and is connected to the floor layer; the radiation layer includes: two pairs of crossed dipoles.

[0029] The floor layer is a plate-like structure, on which two feeding structures (one feeding structure is a first probe, and the other feeding structure is a second probe) are arranged, which are respectively connected to two pairs of cross dipoles to generate dual-linear polarization by coaxial feeding.

[0030] Preferably, the feeding structure includes: an outer conductor, an inner conductor and a separator; the outer conductor is sleeved on the outside of the inner conductor, and the separator is arranged between the outer conductor and the inner conductor; one end of the outer conductor and one end of the inner conductor are flush and both are connected to an external feeding end (the external feeding end is arranged below the floor layer, with an impedance of 50 ohms, matching the SMA interface), the other end of the outer conductor is connected to a radiation patch arranged on the bottom surface of the dielectric plate, and the other end of the inner conductor is connected to a radiation patch arranged on the top surface of the dielectric plate.

[0031] In the embodiment, the provision of the super surface layer, the radiation layer and the floor layer reduces the cross-section of the antenna, improves the reflection effect, the front-to-back ratio and the gain, and improves the cross-polarization ratio and the isolation of the antenna, thereby ensuring the frequency matching effect and preventing leakage waves.

[0032] In one embodiment, the radiation layer includes: a dielectric plate and four radiation patches as the main radiation structure; the dielectric plate and the radiation patch are both square structures, and one side of any radiation patch is parallel to one side of the dielectric plate, and the side length of the square structure is the side length of the dielectric plate or the radiation patch; the four radiation patches are arranged on the dielectric plate at intervals and are centrally symmetrically distributed about the center of the dielectric plate; two radiation patches are adjacently arranged on the top surface of the dielectric plate, and the other two radiation patches are adjacently arranged on the bottom surface of the dielectric plate; two opposite radiation patches are connected to form a dipole; the two dipoles are arranged crosswise to form a cross dipole. The above arrangement further improves the cross-polarization ratio and isolation of the antenna.

[0033] Preferably, a group of diagonal portions of the radiation patch are symmetrically provided with isosceles right triangle structured grooves, so that each radiation patch forms a hexagonal structure, and all radiation patches form a "cross" structure, so as to expand the bandwidth of the antenna.

[0034] Further preferably, the ratio of the right-angle side length of the slot, the side length of the radiation patch and the side length of the dielectric plate is 1:3:9, so as to further expand the bandwidth of the antenna and improve the gain stability.

[0035] Further preferably, the radiation patch is a square structure, and each corner is provided with a rounded corner to further expand the bandwidth of the antenna.

[0036] In one embodiment, the radiation layer further includes: four metal columns to serve as the radiation arms of the dipole; that is, the radiation layer includes: a dielectric plate, four radiation patches and four metal columns; the metal columns are regular quadrangular prism structures, one corresponding end of the four metal columns is vertically connected to the dielectric plate, and there is a gap between the four metal columns and the radiation patches, and the other corresponding end is vertically connected to the floor layer. The above arrangement combined with the metasurface layer further reduces the cross-section of the antenna, further improves the reflection effect, front-to-back ratio and gain, and as an extension of the dipole radiation arm, improves the antenna's beam width, cross-polarization ratio and isolation, and ensures the stability of the radiation direction.

[0037] Preferably, the height of the metal column is 3.5 to 4 times the distance between the radiation layer and the metasurface layer to increase the beam width and further reduce the cross-section of the antenna, further improving the reflection effect, front-to-back ratio and gain.

[0038] In one embodiment, the radiation layer further includes: a connection structure to serve as a microstrip feed line; that is, the radiation layer includes: a dielectric plate, four radiation patches, four metal columns and a connection structure; the connection structure includes: a first connection member and a second connection member, which are respectively connected to the two dipoles. Specifically: the first connector includes: a first probe and a first connecting patch, the first connecting patch is a strip structure; the first connecting patch is arranged on the top surface of the dielectric plate, one end of which is directly connected to a radiation patch of the corresponding dipole, and the other end of which is connected to another radiation patch of the corresponding dipole through the first probe; the second connector includes: a second probe, a second connecting patch, a third connecting patch and a fourth connecting patch, the second connecting patch, the third connecting patch and the fourth connecting patch are all strip structures; the second connecting patch is arranged on the top surface of the dielectric plate, one end of which is directly connected to a radiation patch of the corresponding dipole, and the other end of which is connected to the fourth connecting patch through a connecting tube (a vertically arranged metal through hole); the third connecting patch is arranged on the top surface of the dielectric plate, one end of which is connected to another radiation patch of the corresponding dipole through the second probe, and the other end of which is connected to the fourth connecting patch through a connecting tube; the fourth connecting patch is arranged on the bottom surface of the dielectric plate, and two ends of which are respectively connected to the other end of the second connecting patch and the other end of the third connecting patch through a connecting tube. The above arrangement avoids mutual influence between the two dipoles, ensures the dual-polarization effect, and further improves the cross-polarization ratio and isolation of the antenna.

[0039] Preferably, the length directions of the second connecting patch, the third connecting patch and the fourth connecting patch are the same, and the length direction of the second connecting patch is used as the length direction of the second connecting member; the length direction of the second connecting member intersects the length direction of the first connecting member perpendicularly at the center of the dielectric plate to produce +45°, -45° polarization.

[0040] In the present application, the substrate, the dielectric plate and the non-metallic column are all made of non-metallic materials, and the other components are all made of metallic materials.

[0041] The above-mentioned cross-dipole antenna is a dual-linear polarized cross-dipole antenna based on a metasurface, which overcomes the problem of deterioration of the radiation pattern after lowering the antenna height in the prior art (because the distance from the radiator to the reflector is less than a quarter of the wavelength, the reflected wave and the wave directly radiated axially will not be added in phase, and impedance matching over a wide bandwidth is difficult to achieve), and has the characteristics of low profile and high performance. The profile is not reduced at the cost of performance, but high performance is guaranteed while reducing the profile, so that the antenna has superior performance and ensures good and stable antenna radiation performance. It is widely used in base station communications, base station antennas, broadband antennas, dual-polarized antennas, wireless communication systems, the Internet of Things, the Internet of Vehicles and other fields, especially scenarios involving low-profile base station communication environments.

[0042] Compared with the prior art, this application has the following technical effects: 1. This application has an extremely low profile. The profile of the antenna is 34.762mm, and the profile height is 0.09λ, which is only 36% of the profile height of the traditional antenna (0.25λ), which can meet the needs of low posture.

[0043] 2. This application has broadband characteristics. The impedance bandwidth of the antenna is 685MHz-1070MHz, and the relative bandwidth is 43.9%, which can cover the base station communication frequency band.

[0044] 3. The cross-polarization ratio of the present application is high. The average cross-polarization ratio of the antenna is over 30 dB, which is much greater than 20 dB. The polarization performance is good, which can better suppress various interferences and is conducive to the stable transmission of signals.

[0045] 4. The beam width of this application is relatively wide, and the 3dB beam width of the antenna exceeds 80°, ensuring that the system has sufficient communication connection.

[0046] 5. The isolation of this application is high, and the isolation of the antenna in the entire working frequency band is greater than 20dB, which can ensure that each port works independently without affecting each other.

[0047] 6. The front-to-back ratio of the present application is high. The front-to-back ratio of the antenna in the entire working frequency band is greater than 20dB, which ensures the stability of radiation and can remain stable in complex and changeable communication environments. It has broad application prospects.

[0048] 7. The present application has a simple structure, is easy to process and manufacture, and has low cost, and can be used in complex and changeable modern wireless mobile communication systems to work reliably.

[0049] In a specific embodiment, the coaxial feeding port connected to the first probe is port 1, and the coaxial feeding port connected to the second probe is port 2; the substrate and the dielectric plate are both made of FR4 material (dielectric constant is 4, loss tangent is 0.005), the thickness is 0.762mm, the thickness of the floor layer is 0.5mm, the height of the antenna is H=34.762mm, and the overall size of the antenna is 220*220*34.762mm 3 , specific dimensions such as Figures 2 to 4As shown, where: the length L of the super surface layer is 220mm, and the width W is 220mm; the super surface unit is a square structure with a side length W2=39mm; the distance between two adjacent super surface units is 1mm; the substrate position where the super surface unit is located is a square structure with a side length W1=40mm; the sum of the distance between the super surface layer and the radiation layer and the thickness of the dielectric plate H2=7mm; the length Lp=180mm and the width Wp=180mm of the dielectric plate 21; the side length W3=60mm of the radiation patch, which is the side length of the radiation patch minus the cut groove The length W2=40mm, the radius of the chamfer on the radiation patch R=5mm; the distance between two adjacent radiation patches is 1mm; the height H1=26.5mm of the metal column, the cross-sectional side length Wm=27mm of the metal column; the inner conductor diameters of the first probe and the second probe are 1mm, and the diameter of the connecting tube is 1mm; the length L1=13.6mm and the width W5=5mm of the first connecting patch; the width of the second connecting patch is 5mm; the length L2=6mm and the width W5=5mm of the third connecting patch.

[0050] The electromagnetic full-wave simulation software CST is used to simulate and analyze the above antenna, and its structural parameters, S parameters, gain and radiation pattern are studied. The results are as follows Figures 6 to 25 shown.

[0051] like Figure 6 As shown, the S11 and S22 parameters of the antenna are both less than -10dB in the range of 685MHz-1070MHz, the relative bandwidth is 43.9%, and the isolation of the antenna is greater than 20 dB. It can be seen that the antenna has broadband characteristics, excellent impedance bandwidth and excellent isolation.

[0052] like Figure 7 As shown, the minimum gain of the antenna is above 7.5dBi, and the peak gain can reach 8.15dBi. It can be seen that the antenna gain is high and the gain fluctuation is not large, so the signal can be transmitted effectively and stably.

[0053] like Figures 8 to 19 As shown, from the radiation patterns of port 1 and port 2 at different frequencies in the horizontal and vertical planes within the working frequency band, it can be seen that the front-to-back ratio of the antenna is large, the cross-polarization ratio is greater than 20 dB, and the beam width is wide.

[0054] like Figure 20 to Figure 25 As shown, from the surface current diagrams of port 1 and port 2 at different frequencies within the working frequency band, it can be seen that the antenna produces good dual-linear polarization within the working frequency band, proving the stability and reliability of the antenna operation.

[0055] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0056] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, 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, they should be considered to be within the scope of this specification.

[0057] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A cross-dipole antenna, characterized in that: include: Super surface layer, radiant layer and floor layer; The super surface layer is connected to the floor layer, and a containing space is formed between the super surface layer and the floor layer. ； The radiation layer is arranged in the accommodating space, connected to the floor layer, and spaced apart from the super surface layer; The radiation layer includes: two pairs of crossed dipoles; Two feeding structures are arranged on the floor layer and are respectively connected to two pairs of cross dipoles.

2. A cross-dipole antenna according to claim 1, characterized in that: The radiation layer includes: a dielectric plate and four radiation patches that are distributed symmetrically with respect to the center of the dielectric plate; The dielectric plate and the radiation patch are both square structures, and one side of the radiation patch is parallel to one side of the dielectric plate; Two radiation patches are adjacently arranged on the top surface of the dielectric plate, and another two radiation patches are adjacently arranged on the bottom surface of the dielectric plate; the two opposite radiation patches are connected to serve as a dipole.

3. A cross-dipole antenna according to claim 2, characterized in that: A group of diagonal portions of the radiation patch are symmetrically provided with isosceles right triangle structured grooves, so that the radiation patch forms a hexagonal structure, and all the radiation patches form a "cross" structure.

4. A cross-dipole antenna according to claim 3, characterized in that: The ratio of the right-angle side length of the groove, the side length of the radiation patch and the side length of the dielectric plate is 1:3:

9.

5. A cross-dipole antenna according to any one of claims 2 to 4, characterized in that: The radiation layer further includes: four metal pillars serving as radiation arms; The metal column is a regular quadrangular prism structure, one corresponding end of which is connected to the dielectric plate and has a gap with the radiation patch, and the other corresponding end of which is connected to the floor layer.

6. A cross-dipole antenna according to claim 5, characterized in that: The height of the metal column is 3.5 to 4 times the distance between the radiation layer and the super surface layer.

7. A cross-dipole antenna according to any one of claims 2 to 4, characterized in that: The radiation layer further includes: a first connecting member and a second connecting member corresponding to the two dipoles respectively; The first connecting member comprises: a first connecting patch of a strip structure; the first connecting patch is arranged on the top surface of the dielectric plate, one end of the first connecting patch is directly connected to a radiation patch of the corresponding dipole, and the other end is connected to another radiation patch of the corresponding dipole through a feeding structure; The second connecting member includes: a second connecting patch, a third connecting patch and a fourth connecting patch of a strip structure; the second connecting patch is arranged on the top surface of the dielectric plate, one end of which is directly connected to a radiation patch of the corresponding dipole, and the other end is connected to the fourth connecting patch through a connecting tube; the third connecting patch is arranged on the top surface of the dielectric plate, one end of which is connected to another radiation patch of the corresponding dipole through another feeding structure, and the other end is connected to the fourth connecting patch through a connecting tube; the fourth connecting patch is arranged on the bottom surface of the dielectric plate, and both ends are connected to the other end of the second connecting patch and the other end of the third connecting patch through connecting tubes respectively.

8. A cross-dipole antenna according to claim 7, characterized in that: The second connection patch, the third connection patch and the fourth connection patch have the same length direction, and the length direction of the second connection patch is used as the length direction of the second connector; The length direction of the second connecting member is perpendicular to the length direction of the first connecting member and intersects at the center of the dielectric plate.

9. A cross-dipole antenna according to any one of claims 1 to 4, characterized in that: The super surface layer comprises: a substrate and a plurality of super surface units with square structures; A plurality of the super-surface units are arranged at intervals on the top surface of the substrate to form a square array.

10. A cross-dipole antenna according to any one of claims 2 to 4, characterized in that: The feeding structure comprises: an outer conductor and an inner conductor, wherein a separator is provided between the outer conductor and the inner conductor; One end of the outer conductor and one end of the inner conductor are connected to an external feeding end, the other end of the outer conductor is connected to a radiation patch arranged on the bottom surface of the dielectric plate, and the other end of the inner conductor is connected to a radiation patch arranged on the top surface of the dielectric plate.

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