High cross-polarization ratio patch antenna and communication base station

Abstract

The present application discloses a high cross-polarization ratio patch antenna and a communication base station, wherein the patch antenna comprises: a substrate, a metal reflective surface, a main radiating surface and a parasitic radiating surface; the main radiating surface is arranged on the upper surface of the substrate, and the main radiating surface is provided with a main radiating plate and a feeding port; a convex structure is arranged at one end of the main radiating surface, and the convex structure is in the shape of a convex letter, and its convex direction is the direction of the feeding port, and is parallel to the feeding port, and both sides of the convex structure are connected to the feeding port; the metal reflective surface is located on the lower surface of the substrate, and is integrally formed by laser engraving or selective electroplating technology; the parasitic radiating surface comprises a parasitic radiating plate, and the parasitic radiating plate is arranged parallel to the main radiating plate, and the parasitic radiating plate is fixed to the substrate by a support column. The aforementioned structure is adopted, and by arranging a convex structure on the main radiating plate, the polarization purity of the main radiating surface is improved, thereby improving the cross-polarization ratio of the patch antenna. In addition, the structure of the present application adopts two-point feeding, which makes the patch antenna wiring simple.

Description

Technical Field

[0001] The present application relates to the technical field of mobile communication base stations, and in particular to a high cross-polarization ratio patch antenna and a communication base station. Background Art

[0002] Traditional communication base station antennas mostly use dipole antennas with ±45-degree cross-arrangement as oscillators, which have the advantages of wideband, high isolation, and high cross-polarization ratio. However, in order to ensure the good reflection characteristics of the dipole antenna, the height of the dipole antenna is usually required to be about a quarter of a wavelength away from the ground. Reducing the height of the antenna array is a major trend in the 5G communication base station technology era. Therefore, in the strict restrictions on the height of the antenna array of 5G communication base stations, the oscillator type of the dipole antenna does not have an advantage in reducing the height of the antenna array.

[0003] In the design of low-profile oscillators, patch antennas are a good choice. Patch antennas can greatly reduce the height of the oscillator and meet the requirements of 5G communication base stations. Therefore, more and more 5G communication base stations use patch antennas. However, patch antennas have the problem of relatively low cross-polarization, and the cross-polarization ratio is an important indicator to measure the radiation performance and coverage effect of the antenna. It specifically refers to the ratio of the main polarization component of the antenna to the cross-polarization component, which reflects the polarization purity of the base station antenna. Therefore, a low cross-polarization ratio will affect the network coverage effect and the uplink communication quality. In order to improve the cross-polarization ratio of the patch antenna, the traditional method is to use four-probe differential feeding to improve the polarization purity. For example, the probes in a group of two are set with equal amplitude and inverse phase (i.e., the phase difference is 180 degrees) to achieve the effect of improving the polarization purity, thereby improving the cross-polarization ratio of the patch antenna. However, the above-mentioned patch antenna has the problem of complex network wiring. Therefore, how to obtain a patch antenna with a high cross-polarization ratio and simple wiring is an urgent problem to be solved. Summary of the invention

[0004] The present application provides a high cross-polarization ratio patch antenna and a communication base station to obtain a patch antenna with a high cross-polarization ratio and simple wiring.

[0005] In a first aspect, an embodiment of the present application provides a high cross-polarization ratio patch antenna, comprising: a substrate, a metal reflective surface, a main radiating surface, and a parasitic radiating surface;

[0006] The main radiation surface is arranged on the upper surface of the substrate, and the main radiation surface is provided with a main radiation sheet and a feeding port;

[0007] The main radiation surface is formed on the upper surface of the substrate by copper coating, laser engraving or selective electroplating;

[0008] A convex structure is provided at one end of the main radiation surface, the shape of the convex structure is a convex shape, the convex direction of the convex structure is the direction of the feeding port and is parallel to the feeding port, and both sides of the convex structure are connected to the feeding port;

[0009] The metal reflective surface is located on the lower surface of the substrate, and the metal reflective surface is integrally formed by laser engraving or selective electroplating technology, so that it and the main radiation sheet on the upper surface of the substrate finally form a microstrip antenna that radiates electromagnetic waves outward;

[0010] The parasitic radiation surface comprises a parasitic radiation plate, which is arranged in parallel and directly above the main radiation plate, and the parasitic radiation plate is fixed on the substrate through a supporting column.

[0011] In combination with the first aspect, in one implementation, the high cross-polarization ratio patch antenna further includes: a separation wall;

[0012] The isolation wall is a metal isolation wall, which is vertically arranged on both sides of the substrate. There are two isolation walls, and the two isolation walls are arranged in parallel.

[0013] In combination with the first aspect, in an implementation manner, the other end of the main radiation piece relative to the convex structure is set to a trapezoidal structure, and the main radiation piece is an integrally formed structure.

[0014] In combination with the first aspect, in one implementation, a gap is provided between the convex structure and the feeding port, the length of the feeding port is greater than the protruding length of the convex structure, and the outer edge of the feeding port is flush with the outer edge of the convex structure; wherein the outer edge of the feeding port is the side away from the convex structure.

[0015] In combination with the first aspect, in one implementation, the substrate is made of modified plastic.

[0016] In combination with the first aspect, in one implementation, the support columns are four plastic support columns, and the parasitic radiation sheet is fixed to the four plastic support columns by using a metal sheet.

[0017] In combination with the first aspect, in an implementation manner, a plurality of high cross-polarization ratio patch antennas are further provided between the substrate and the main radiating surface, and are connected by transmission lines to form a multi-unit antenna array.

[0018] In combination with the first aspect, in an implementation manner, the main radiation plate is smaller than the parasitic radiation plate, and the main radiation plate and the parasitic radiation plate are placed opposite to each other.

[0019] In a second aspect, some embodiments of the present application provide a communication base station, which includes a high cross-polarization ratio patch antenna as described in any implementation method of the first aspect.

[0020] The present application discloses a high cross-polarization ratio patch antenna and a communication base station, the patch antenna comprising: a substrate, a main radiating surface, a metal reflective surface and a parasitic radiating surface; the main radiating surface is arranged on the upper surface of the substrate, and the main radiating surface is formed on the upper surface of the substrate by copper cladding, laser engraving or selective electroplating; the main radiating surface is provided with a main radiating plate and a feeding port; a convex structure is arranged at one end of the main radiating surface, the convex structure is in the shape of a convex letter, the convex direction of the convex structure is the direction of the feeding port, and is parallel to the feeding port, and both sides of the convex structure are connected to the feeding port; the metal reflective surface is located on the lower surface of the substrate, and the metal reflective surface is integrally formed by laser engraving or selective electroplating technology, so that it and the main radiating plate on the upper surface of the substrate finally form a microstrip antenna that radiates electromagnetic waves outward; the parasitic radiating surface comprises a parasitic radiating plate, the parasitic radiating plate is arranged parallel to the upper side of the main radiating plate, and the parasitic radiating plate is fixed to the substrate by a supporting column. By adopting the aforementioned structure, a convex structure is set on the main radiating plate to concentrate the current distribution on a single feeding port, thereby improving the polarization purity of the main radiating surface and thereby improving the cross-polarization ratio of the patch antenna. In addition, the structure of the present application adopts two-point feeding to simplify the wiring of the patch antenna. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the embodiments are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0022] Figure 1 It is a schematic diagram of the overall structure of a high cross-polarization ratio patch antenna provided in an embodiment of the present application;

[0023] Figure 2 is a top view of a high cross-polarization ratio patch antenna provided in an embodiment of the present application;

[0024] Figure 3 This is a current distribution diagram of the main radiation sheet in an embodiment provided by the embodiment of the present application;

[0025] Figure 4 is the radiation pattern of the patch antenna unit in the prior art;

[0026] Figure 5 It is a high cross-polarization ratio patch antenna radiation pattern disclosed in an embodiment of the present application.

[0027] Among them, 1-substrate, 11-support column; 2-main radiation surface, 21-main radiation plate, 211-convex structure, 22-feeding port; 3-parasitic radiation surface, 31-parasitic radiation plate; 4-isolation wall; 5-metal reflector. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0029] From the description of the background technology, it can be known that the cross-polarization ratio specifically refers to the ratio of the main polarization component of the antenna to the cross-polarization component, which is used to reflect the polarization purity of the antenna; the larger the cross-polarization ratio, the stronger the orthogonality of the signal that can be obtained from the antenna, and the smaller the correlation between the two signals, thereby bringing good network coverage and excellent uplink communication quality. Therefore, finding a method that can improve the cross-polarization ratio of patch antennas is of great significance in the field of 5G base station technology. The embodiment of the present application takes the Massive MIMO patch antenna as the research object, analyzes the current distribution on the surface of the radiating antenna through simulation, and then optimizes the structural form of the main radiating plate of the patch antenna, thereby greatly improving the cross-polarization ratio characteristics of the antenna, and obtaining a high cross-polarization ratio patch antenna.

[0030] To solve the above problems, the present application is based on the design of the patch antenna itself. Since the two polarizations of the main radiating surface are directly physically connected and relatively easy to interfere with each other, conventional designs easily lead to a chaotic distribution of the surface current, and then problems such as the cross-polarization ratio occur. Therefore, without changing the basic form of the radiating unit, the present application uses simulation methods to analyze the current distribution on the main radiating piece and finds that the electromagnetic wave of the feeding signal presents a transmission mode in the feeding network, and when it enters the main radiating piece from the feeding network, the electromagnetic wave will change from the transmission mode to the radiation mode. Therefore, at the connection between the feeding network and the main radiating piece, the surface electromagnetic wave has a large mutation, and then a high-order mode is formed there, which eventually leads to a chaotic distribution of the current entering the radiating piece, which deteriorates the overall radiation effect of the antenna, and it is difficult for various radiation performance indicators to meet the expected target requirements. Therefore, in order not to change the design form of the antenna unit and not to increase additional design and processing difficulties. The present application discloses the following schemes:

[0031] See also Figure 1 and Figure 2 , the embodiment of the present application provides a high cross-polarization ratio patch antenna, Figure 1 is a schematic diagram of the overall structure of the high cross-polarization ratio patch antenna, Figure 2 It is a top view cross-sectional view of a high cross-polarization ratio patch antenna, which includes: a substrate 1, a metal reflection surface (not marked in the figure), a main radiation surface 2 and a parasitic radiation surface 3.

[0032] Optionally, the metal reflective surface is located on the lower surface of the substrate 1, and the metal reflective surface is integrally formed by laser engraving or selective electroplating technology, so that it and the main radiation plate 21 on the upper surface of the substrate 1 finally form a microstrip antenna that radiates electromagnetic waves outward.

[0033] The substrate 1 is made of modified plastic and is processed by injection molding. The substrate 1 includes a plastic retaining wall, reinforcing ribs, and a plastic support column 11 .

[0034] The relative dielectric constant of the modified plastic is 4 and the tangent loss is 0.005. The modified plastic can be added with corresponding filling materials or its processing technology can be changed according to the needs of the actual environment to improve its flame retardancy, strength, impact resistance, toughness and other properties to make it adapt to the use environment.

[0035] A large metal reflector 5 is also arranged directly below the substrate 1. The metal reflector 5 is used to install and fix the antenna body, and also has the function of reflecting electromagnetic waves, so that the antenna obtains a higher radiation gain.

[0036] The main radiation surface 2 is disposed on the upper surface of the substrate 1 , and the main radiation surface 2 is provided with a main radiation plate 21 and a feeding port 22 .

[0037] The main radiation piece 21 is connected to the feeding port 22 . There are two feeding ports 22 , which are arranged at one end of the main radiation piece 21 and are arranged opposite to each other.

[0038] A convex structure 211 is provided at one end of the main radiating surface 2, that is, a convex structure 211 is provided at one end of the main radiating plate 21, and the shape of the convex structure 211 is a convex shape. The protruding direction of the convex structure 211 is the direction of the feeding port 22 and is parallel to the feeding port 22. Both sides of the convex structure 211 are connected to the feeding port 22.

[0039] The main radiation plate 21 is made by laser engraving and chemical plating, which can make the antenna have better signal transmission and reception capabilities.

[0040] In this embodiment, the convex structure 211 is a convex structure formed by a protrusion in the middle of one end of the main radiation plate 21 close to the feeding port 22. The inner angle of the protruding portion is 90 degrees. The protruding portion of the convex structure 211 is parallel to the feeding port 22. The two feeding ports 22 are respectively arranged on both sides of the convex structure 211, that is, a boss structure is added between the two feeding ports to improve the current distribution, thereby improving the cross-polarization ratio of the antenna. The structure can also be designed by extending branches or cutting grooves at the feeding port. Ultimately, it is sufficient to achieve current balance on the antenna surface.

[0041] The convex structure 211 can correct the path of the current flowing on the surface of the main radiating surface 2 (i.e., flow in the direction of ±45 degrees), so that the current distribution is concentrated on the single feeding port 22, thereby improving the polarization purity of the main radiating surface 2 and further improving the cross-polarization ratio of the patch antenna; Figure 3 As shown, Figure 3 The middle figure (a) is the current distribution diagram of the main radiation surface 2 without the convex structure 211. Figure 3 Figure (b) shows the current distribution diagram of the main radiation surface 2 with the convex structure 211. Figure 3 As can be seen in Figure (a), from the current distribution of the main radiation surface 2, the current distribution is very scattered and chaotic, which greatly affects the purity of polarization and reduces the cross-polarization ratio characteristics; however, from the Figure 3 From the current distribution of the main radiating surface 2 in Figure (b), due to the addition of the convex structure 211, the current distribution begins to concentrate on the single feeding port 22, which greatly improves the polarization purity and thus greatly improves the cross-polarization ratio characteristics of the antenna.

[0042] The high cross-polarization ratio patch antenna disclosed in the present application has an axial cross-polarization ratio that is at least 10dB higher than that of existing structures. For example, in the 3.8GHz frequency band, the axial cross-polarization ratio is 26.02dB, in the 3.7GHz frequency band, the axial cross-polarization ratio is 25.22dB, and in the 3.3GHz frequency band, the axial cross-polarization ratio is 21.64dB.

[0043] The parasitic radiation surface 3 includes a parasitic radiation plate 31 . The parasitic radiation plate 31 is arranged in parallel and directly above the main radiation plate 21 . The parasitic radiation plate 31 is fixed on the substrate 1 through a support column 11 .

[0044] The parasitic radiation surface 3 is a parasitic structure of the main radiation surface 2. The parasitic radiation surface 3 is provided with a parasitic radiation plate 31, and its main function is to increase the antenna bandwidth. The parasitic radiation plate 31 is in the shape of a square structure. The parasitic radiation plate 31 is arranged parallel to the main radiation plate 21 through the support column 11.

[0045] Furthermore, if there are multiple high cross-polarization ratio patch antennas, the multiple high cross-polarization ratio patch antennas are connected through transmission lines to form a multi-unit antenna array.

[0046] In this embodiment, since the structure of the present application adopts two-point feeding and there is no four-probe differential feeding, the patch antenna wiring of the present application is simpler than that of the prior art.

[0047] The high cross-polarization ratio patch antenna of the present application is a double-layer structure, that is, the first layer on the upper surface of the substrate 1 is a feed port and a main radiating surface 2, and the second layer (i.e., the top layer) is a parasitic structure of the main radiating surface 2, which obtains better radiation directivity through electromagnetic coupling, and can also improve the bandwidth characteristics of the antenna unit. The present application adds a convex structure 211 to the first layer of the main radiating surface 2, that is, only adds a convex structure at the two polarized feed ports of the main radiating plate 21, so as to correct the path of the current flowing on the surface of the main radiating surface 2 (i.e., flowing in the direction of ±45 degrees), so that the current distribution of the antenna tends to be more uniform, thereby improving the cross-polarization ratio of the patch antenna.

[0048] The present application discloses a high cross-polarization ratio patch antenna, which includes: a substrate 1, a main radiating surface 2, a metal reflective surface and a parasitic radiating surface 3; the main radiating surface 2 is arranged on the upper surface of the substrate 1, and the main radiating surface is formed on the upper surface of the substrate 1 by copper cladding, laser laser engraving or selective electroplating; the main radiating surface 2 is provided with a main radiating plate 21 and a feeding port 22; a convex structure 211 is provided at one end of the main radiating surface 21, and the shape of the convex structure 211 is a convex shape, and the convex direction of the convex structure 211 is the feeding port. The convex structure 211 is in the direction of the feed port 22 and is parallel to the feed port 22, and both sides of the convex structure 211 are connected to the feed port 22; the metal reflective surface is located on the lower surface of the substrate 1, and the metal reflective surface is integrally formed by laser engraving or selective electroplating technology, so that it and the main radiation plate 21 on the upper surface of the substrate 1 finally form a microstrip antenna that radiates electromagnetic waves outward; the parasitic radiation surface 3 includes a parasitic radiation plate 31, and the parasitic radiation plate 31 is arranged in parallel and directly above the main radiation plate 21, and the parasitic radiation plate 31 is fixed to the substrate 1 through a support column 11. By adopting the aforementioned structure, a convex structure 211 is set on the main radiating plate 21, so that the current distribution is concentrated to a single feeding port 22, thereby improving the polarization purity of the main radiating surface 2, and then improving the cross-polarization ratio of the patch antenna. Similarly, the convex structure 211 will also concentrate the current of the other feeding port to the other end, so that the currents of the two polarizations can be evenly distributed, obtaining better directivity and ultimately obtaining better polarization purity. In addition, the structure of the present application adopts two-point feeding, which makes the patch antenna wiring simple.

[0049] It can be seen from the above scheme that the present application cleverly changes the structural form of the radiating plate feeding port, thereby eliminating the high-order modes generated there due to the mutation of the current. Compared with changing the form of the radiating unit to a complex differential feeding or dipole form, it has a simpler design form and can greatly improve the cross-polarization ratio of the patch antenna to meet the application of 5G communication base stations.

[0050] Furthermore, the high cross-polarization ratio patch antenna further comprises: a separation wall 4;

[0051] The isolation wall 4 is a metal isolation wall 4, which is vertically arranged on both sides of the substrate 1. There are two isolation walls 4, and the two isolation walls 4 are arranged in parallel. The isolation wall 4 can be integrally formed with the metal reflective plate through in-mold forming or laser cutting, thereby increasing the overall reliability.

[0052] In this embodiment, the metal isolation walls 4 are arranged in pairs on both sides of the substrate 1. The structure of the isolation walls 4 is similar to a concave structure. The groove of the concave structure is deeper and almost close to the bottom edge, and the width of the groove is greater than the width of the raised parts on both sides.

[0053] Optionally, the other end of the main radiation piece 21 relative to the convex structure 211 is set to a trapezoidal structure, and the main radiation piece 21 is an integrally formed structure.

[0054] The current shown in the figure is concentrated from the hypotenuse of the trapezoid toward the feeding port 22 .

[0055] Optionally, a gap is provided between the convex structure 211 and the feeding port 22 , the length of the feeding port 22 is greater than the protruding length of the convex structure 211 , and the outer edge of the feeding port 22 is flush with the outer edge of the convex structure 211 ; wherein the outer edge of the feeding port 22 is the side away from the convex structure 211 .

[0056] Optionally, the support columns 11 are four plastic support columns 11 , and the parasitic radiation sheet 31 is fixed to the four plastic support columns 11 by using a metal sheet.

[0057] The parasitic radiation sheet 31 is fixed to the four plastic support columns 11 by hot-melting a metal sheet.

[0058] Optionally, the main radiation plate 21 and the parasitic radiation plate 31 are flush with each other at one end close to the feeding port 22 .

[0059] Since the high cross-polarization ratio patch antenna of the present application utilizes plastic gold plating and metal sheet hot-melt processes, the antenna of the present application has obvious advantages in terms of consistency over the traditional PCB assembly process.

[0060] In order to make the beneficial effects of the patch antenna more clear, the embodiment of the present application also discloses a comparison of the effects of the high polarization ratio patch antenna and the patch antenna in the prior art, as follows:

[0061] See also Figure 4 , Figure 4The radiation pattern of the traditional patch antenna unit in the prior art, the horizontal axis Theta (deg) in the figure is the angle, and the vertical axis Y1 represents the normalized level of the main polarization and cross-polarization radiation fields. It can be seen from the figure that the convergence of the main polarization pattern of the antenna unit is relatively poor, especially near the rear area, the pattern also diverges in the region, and the cross-polarization component has a higher arch component in the axial direction. The result of this pattern is different from Figure 3 The current divergence in Figure (a) also responds well, which ultimately leads to a relatively poor cross-polarization ratio, especially the axial component, which is as bad as 12dB, which is worse than the 15dB required in general engineering.

[0062] Figure 5 The cross-polarization ratio radiation pattern of the antenna disclosed in the embodiment of the present application, in which the horizontal axis Theta (deg) is the angle, and the vertical axis Y1 represents the normalized level of the main polarization and cross-polarization radiation fields. Figure 4 In comparison, the structure of the antenna disclosed in the present application has a greatly improved cross-polarization ratio characteristic. The lowest point of the axial cross-polarization ratio can reach more than 21dB. Compared with the prior art, the axial cross-polarization ratio of the antenna unit of the present application is improved by about 10dB. Therefore, the method of adding a convex structure proposed in the present application can greatly improve the cross-polarization ratio characteristic by correcting the current path of the main radiation surface. It can be seen that the method of improving the antenna cross-polarization ratio by adding a boss at the patch feeding port in the present application is essentially to optimize the structural form at the feeding port that is prone to generate high-order modes, thereby balancing the surface current on the radiating piece, and finally eliminating the influence of high-order modes. Therefore, this method of improving the antenna cross-polarization ratio is not limited to designing the antenna structure by adding a boss, and the structure can also be designed by extending branches or cutting slots at the feeding port. In the end, it is only necessary to achieve surface current balance of the antenna.

[0063] As can be seen from the above, the structural improvement of the patch antenna of the present application has significantly improved the cross-polarization ratio characteristics of the antenna. Therefore, the present application is applicable to various double-layer patch antenna structures similar to the one used as an example in this application, and is widely used for the problem of improving the cross-polarization ratio of low-height patch antennas in the 5G era. At the same time, the present application is not limited to the double-layer patch antenna form, but can also be designed for single-layer patch antennas. In addition, the present application shows a direct feed design, and can also be used for a coupled probe feed design antenna structure. This application does not make specific limitations.

[0064] Based on the high cross-polarization ratio patch antenna disclosed above, the embodiments of the present application also provide a communication base station, which includes the high cross-polarization ratio patch antenna as described in any of the above implementations.

[0065] The present application is described in detail above in conjunction with specific implementation methods and exemplary examples, but these descriptions cannot be understood as limiting the present application. Those skilled in the art understand that, without departing from the spirit and scope of the present application, a variety of equivalent replacements, modifications or improvements can be made to the technical solution of the present application and its implementation methods, all of which fall within the scope of the present application. The scope of protection of the present application shall be subject to the attached claims.

Claims

1. A high cross-polarization ratio patch antenna, characterized in that: include: Substrate, metal reflective surface, main radiating surface and parasitic radiating surface; The main radiation surface is arranged on the upper surface of the substrate, and the main radiation surface is provided with a main radiation sheet and a feeding port; The main radiation surface is formed on the upper surface of the substrate by copper coating, laser engraving or selective electroplating; The material of the substrate is modified plastic; A convex structure is provided at one end of the main radiation surface, the shape of the convex structure is a convex shape, the convex direction of the convex structure is the direction of the feeding port and is parallel to the feeding port, and both sides of the convex structure are connected to the feeding port; A gap is provided between the convex structure and the feed port, the length of the feed port is greater than the protruding length of the convex structure, and the outer edge of the feed port is flush with the outer edge of the convex structure; wherein the outer edge of the feed port is the side away from the convex structure; The other end of the main radiation piece relative to the convex structure is set to a trapezoidal structure, and the main radiation piece is an integrally formed structure; The metal reflective surface is located on the lower surface of the substrate, and the metal reflective surface is integrally formed by laser engraving or selective electroplating technology, so that it and the main radiation sheet on the upper surface of the substrate finally form a microstrip antenna that radiates electromagnetic waves outward; The parasitic radiation surface comprises a parasitic radiation sheet, the parasitic radiation sheet is arranged in parallel and directly above the main radiation sheet, and the parasitic radiation sheet is fixed on the substrate through a support column; The high cross-polarization ratio patch antenna further includes: a separation wall; The isolation wall is a metal isolation wall, which is vertically arranged on both sides of the substrate. There are two isolation walls, and the two isolation walls are arranged in parallel.

2. The high cross-polarization ratio patch antenna according to claim 1, characterized in that: The support columns are four plastic support columns, and the parasitic radiation sheet is fixed to the four plastic support columns by using metal sheets.

3. The high cross-polarization ratio patch antenna according to claim 1, characterized in that: Multiple high cross-polarization ratio patch antennas are connected through transmission lines to form a multi-unit antenna array.

4. The high cross-polarization ratio patch antenna according to claim 1, characterized in that: The main radiation plate is smaller than the parasitic radiation plate, and the main radiation plate and the parasitic radiation plate are placed opposite to each other.

5. A communication base station, characterized in that: The base station comprises the high cross-polarization ratio patch antenna as described in any one of claims 1-4.

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