Common-aperture filtering dual-polarization array antenna

Abstract

The invention relates to the field of electronic information and communication, and provides a common-caliber filtering dual-polarization array antenna which comprises a low-frequency antenna unit and a high-frequency antenna unit, the low-frequency antenna unit comprises a plurality of low-frequency radiators and a PCB floor, a feed substrate is arranged between each low-frequency radiator and the PCB floor, and the high-frequency antenna unit comprises a plurality of low-frequency radiators and a plurality of high-frequency radiators. One side of the feed substrate is provided with a split-ring resonator and a feed branch line, and the other side of the feed substrate is provided with a back C-shaped feed metal plate and a first coupling slot; each low-frequency radiator is provided with a high-frequency antenna unit, the high-frequency antenna unit comprises a dielectric plate, a first metal floor and a coaxial feed strut, the upper surface and the lower surface of the dielectric plate are provided with the high-frequency radiators and gamma-shaped coupling feed branches respectively, and the high-frequency radiators are provided with second coupling gaps; one end of the coaxial feed pillar inner core and one end of the coaxial feed pillar outer core are respectively connected with the inverted L-shaped coupling feed branch knot and the high-frequency radiator, and the other end is respectively connected with the power distribution network and the first metal floor. The array is small in size, light in weight, good in performance and capable of reducing mutual coupling between array units.

Description

Technical Field

[0001] The present invention relates to the fields of electronic information and communication, and particularly to an antenna, especially a common-aperture filtering dual-polarized array antenna. Background Art

[0002] With the rapid development of modern communication technologies, especially the continuous evolution of 5G and even future 6G communication systems, the electromagnetic environment faced by communication devices has become increasingly complex, and the demand for multi-band signal transmission has been increasing day by day. In a multiple-input multiple-output (MIMO) system, to improve the data transmission rate and system capacity, multiple antenna elements are usually highly integrated in a limited space. However, this integration method will cause a series of problems. Since the spacing between antenna elements is reduced, the electromagnetic coupling between them is significantly enhanced, which in turn has a negative impact on the system performance, specifically manifested as a decrease in signal-to-noise ratio, a reduction in antenna gain and efficiency, and a decrease in channel capacity. Therefore, how to improve the isolation between antenna elements has become a key problem that needs to be solved urgently.

[0003] At the same time, modern communication systems have put forward higher requirements for the support capabilities of frequency bands and services. 5G and even future 6G communication systems not only need to achieve high-speed data transmission, but also need to meet the specific requirements of signal transmission in different frequency bands under diverse application scenarios such as the Internet of Things and intelligent transportation. This requires the antenna to be able to process signals in multiple frequency bands within a limited space. In addition, as communication devices continue to develop in the direction of miniaturization, the limitation on the antenna volume has become more and more strict. Traditional multi-band and dual-polarized antennas use discrete radiation elements and feeding networks, resulting in a large volume and being difficult to meet the requirements of the compact design of modern communication devices. Moreover, the base station antennas mostly adopt an independent station-building mode, which makes the base station antennas face many dilemmas, such as tight site availability, limited antenna erection space, and increasingly serious electromagnetic interference problems. These problems will not only exacerbate the tension of base station resources, cause a large amount of waste of resources, but also lead to a significant increase in operating costs. In view of this, the common-aperture design of multi-frequency integration has become the mainstream form of modern base station communication antennas.

[0004] In addition, when designing a dual-band or multi-band base station array antenna, especially a wide-band dual-band or multi-band antenna, clutter often occurs outside the operating frequency band of the antenna. These out-of-band clutters will cause serious coupling between different frequency bands, interfere with the antenna pattern, and reduce the overall performance of the communication system. Traditional dual-band dual-polarized base station antennas mostly adopt the scheme of cascaded filters or combiners / duplexers to achieve good isolation, but this will bring additional losses, increase the volume of the antenna, and at the same time increase the product cost. Therefore, an antenna array structure with the characteristics of multi-frequency integration, common-aperture, dual-polarization, high isolation, and filtering function is needed. Summary of the Invention

[0005] To solve the problems in the background art, the present invention proposes a common-aperture, multi-band, high-isolation, filtering dual-polarized array antenna. This antenna combines small size, light weight, excellent performance and high reliability, effectively reducing the back lobe, enhancing the gain, while reducing the mutual coupling between array elements and comprehensively improving the overall performance of the antenna array. The technical solution is as follows: A common-aperture filtering dual-polarized array antenna, comprising a low-frequency antenna unit and a high-frequency antenna unit. The low-frequency antenna unit includes a plurality of low-frequency radiators and a PCB floor. The plurality of low-frequency radiators are arranged in a rectangular array. Two cross-shaped feed substrates are correspondingly provided between each low-frequency radiator and the PCB floor. An open resonator and a feed branch are provided on one side of the feed substrate, and a back C-shaped feed metal plate and a first coupling slot are provided on the other side of the feed substrate. Part of the line body of the feed branch covers the first coupling slot, and the feed branch is connected to a first power distribution network; Four high-frequency antenna units arranged in a rectangular array are provided on each low-frequency radiator. The high-frequency antenna unit includes a dielectric plate, a first metal floor and a coaxial feed post. A high-frequency radiator is provided on the upper surface of the dielectric plate, and four Γ-shaped coupling feed stubs uniformly arranged in the circumferential direction are provided on the lower surface of the dielectric plate. A second coupling slot is provided on the high-frequency radiator. The coaxial feed post corresponds to the Γ-shaped coupling feed stub in terms of quantity and position. The inner core and the outer core at one end of the coaxial feed post are respectively connected to the Γ-shaped coupling feed stub and the high-frequency radiator, and the inner core and the outer core at the other end of the coaxial feed post are respectively connected to a second power distribution network and the first metal floor. Preferably, the open resonator includes a large open resonator and a small open resonator. The small open resonator is located inside the large open resonator, and the opening directions of the small open resonator and the large open resonator are the same; Two groups of open resonators are provided on one side of each feed substrate. The two groups of open resonators are symmetric in position, and the opening directions of the two groups of open resonators are opposite.

[0006] Preferably, two symmetric first coupling slots are provided on each feed substrate, and the two first coupling slots are respectively located on the opposite sides of the two groups of open resonators.

[0007] Preferably, the feed branch on each feed substrate is arranged in an S shape. The feed branch is provided on the circumferential side of each group of open resonators except the opening side, and the two ends of the feed branch respectively pass through the two first coupling slots.

[0008] Preferably, the second coupling slot corresponds to the Γ-shaped coupling feed stub in terms of quantity and position.

[0009] Preferably, both the low-frequency radiator and the feeding substrate are made of F4B high-frequency dielectric plates with a dielectric constant ɛ = 2.0 to 4.0, and the thickness T of the low-frequency radiator and the feeding substrate is 1.0 to 4.0 mm.

[0010] Preferably, the center-to-center spacing dr between two adjacent low-frequency radiators is 135 to 265 mm.

[0011] Preferably, the PCB floor includes a dielectric layer, a second metal floor and metal patches respectively disposed on both sides of the dielectric layer. There are N (N≥81) metal patches, and the multiple metal patches are arranged in a rectangular array. Four pairs of equal-length slits are provided along the circumferential side of the metal patch, and the positions of the second metal floor and the metal patches correspond to each other.

[0012] Preferably, a metal shorting post is connected to the center position of each metal patch, and the end of the metal shorting post away from the metal patch penetrates the dielectric layer and is electrically connected to the second metal floor.

[0013] Preferably, the center-to-center spacing between two adjacent metal patches is ds = 14 to 28 mm, and the side length dm of each metal patch is 15 to 25 mm.

[0014] The beneficial effects of the present invention are as follows: Through the co-aperture layout method, the present invention integrates low-frequency antenna units and high-frequency antenna units of multiple frequency bands in a limited space, greatly reducing the volume and occupied space of the entire antenna system. Compared with traditional combinations of multiple independent antennas, the space utilization efficiency is significantly improved, especially suitable for application scenarios with strict restrictions on device size, such as portable communication devices, aerospace devices, etc., which can effectively reduce the device weight and improve the portability and installation convenience of the system.

[0015] At the same time, the present invention can operate in multiple different frequency bands and can receive and transmit signals of multiple frequency bands simultaneously. This characteristic enables the device to flexibly switch frequency bands in a complex communication environment to adapt to the requirements of different communication protocols and services, greatly expanding the functions and application scope of the communication system. For example, in a communication base station, it can support signal transmission of multiple communication standards such as 2G, 3G, 4G, and 5G simultaneously, without the need to set up antennas separately for each frequency band, reducing the construction and maintenance costs of the base station.

[0016] In addition, the notch characteristic of the present invention can effectively suppress interference signals in specific frequency bands. In the actual electromagnetic environment, there are often interference signals of specific frequencies generated by various interference sources, and these interferences may seriously affect the communication quality. Through the precisely designed notch structure, the antenna can attenuate the signals in these interference frequency bands, ensuring that the signal transmission quality in other useful frequency bands is not affected, significantly improving the anti-interference ability of the antenna system, and enhancing the stability and reliability of communication.

[0017] Through innovative design and optimization, the present invention greatly reduces the coupling effect between low-frequency antenna elements. Especially in scenarios where antennas are densely deployed, such as large-scale MIMO communication systems or base station arrays, the low-coupling characteristic of the present invention can effectively avoid signal crosstalk, ensure the efficient operation of each antenna element, and improve the overall performance and reliability of the system. Brief Description of the Drawings

[0018] Figure 1 Schematic diagram of the array antenna structure of the present invention; Figure 2 Top view of the array antenna of the present invention; Figure 3 Schematic diagram of the split structure of the antenna element of the present invention; Figure 4 Side view of the array antenna of the present invention; Figure 5 Schematic diagram of the back C-shaped feeding metal plate structure of the present invention; Figure 6 S-parameter diagram of the low-frequency antenna element of the present invention; Figure 7 S-parameter diagram of the high-frequency antenna element of the present invention; Figure 8 Normalized far-field radiation pattern of the low-frequency antenna element of the present invention; Figure 9 Normalized far-field radiation pattern of the high-frequency antenna element of the present invention; Figure 10 Isolation S-parameter diagram between low-frequency antenna elements of the present invention.

[0019] Reference numerals in the figures: 1, low-frequency antenna element; 11, low-frequency radiator; 12, feeding substrate; 13, PCB floor; 14, large opening resonant ring; 15, small opening resonant ring; 16, feeding branch; 161, feeding point; 17, back C-shaped feeding metal plate; 18, first coupling slot; 2, high-frequency antenna element; 21, high-frequency radiator; 22, Γ-shaped coupling feeding stub; 23, second coupling slot; 24, coaxial feeding pillar; 25, second metal floor; 3, periodic metasurface structure; 31, metal patch. Detailed Embodiments

[0020] To make the present invention clearer and more understandable, the technical solutions of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the embodiments given are only one of the implementation manners and do not represent all embodiments.

[0021] In this article, terms such as "inner, outer, upper, lower" are established based on the positional relationship shown in the accompanying drawings. Depending on the different accompanying drawings, the corresponding positional relationship may also change accordingly. Therefore, it cannot be understood as an absolute limitation of the protection scope.

[0022] Combined with the attached Figure 1 - attached Figure 10 , a common-aperture filtered dual-polarized array antenna, comprising a low-frequency antenna unit 1 and a high-frequency antenna unit 2. The low-frequency antenna unit 1 includes a plurality of low-frequency radiators 11 and a PCB floor 13. The plurality of low-frequency radiators 11 are arranged in a rectangular array. Two cross-shaped feed substrates 12 are correspondingly provided between each low-frequency radiator 11 and the PCB floor 13. The feed substrates 12 play a role of support and feeding. An open resonator ring and a feed branch 16 are provided on one side of the feed substrate 12, and a back C-shaped feed metal plate 17 and a first coupling slot 18 are provided on the other side of the feed substrate 12. Part of the line body of the feed branch 16 covers the first coupling slot 18, that is, part of the line body of the feed branch 16 passes through the first coupling slot 18. The feed branch 16 is connected to a first power distribution network, and a feed point 161 for connecting to the first power distribution network is provided on the feed branch 16. The feed branch 16 differentially feeds the low-frequency radiator 11 through the first coupling slot 18; Four of the high-frequency antenna units 2 are provided on each low-frequency radiator 11 and are arranged in a rectangular array. The high-frequency antenna unit 2 includes a dielectric plate, a first metal floor, and a coaxial feed post 24. A high-frequency radiator 21 is provided on the upper surface of the dielectric plate, and four Γ-shaped coupling feed stubs 22 are evenly arranged along the circumferential direction on the lower surface of the dielectric plate. A second coupling slot 23 is provided on the high-frequency radiator 21 to provide radiation energy for the antenna. Specifically, the second coupling slot 23 corresponds to the Γ-shaped coupling feed stub 22 in terms of position and quantity, and the length direction of each second coupling slot 23 is perpendicular to the side of the corresponding high-frequency radiator 21, realizing signal transmission, impedance matching, and excitation of the tuning open slot; The coaxial feeding posts 24 correspond to the Γ-shaped coupling feeding branches 22 in terms of quantity and position. The inner core and the outer core at one end of the coaxial feeding post 24 are respectively connected to the Γ-shaped coupling feeding branch 22 and the high-frequency radiator 21. The inner core and the outer core at the other end of the coaxial feeding post 24 are respectively connected to the second power distribution network and the first metal floor. The coaxial feeding post 24 is arranged between the high-frequency radiator 21 and the metal bottom plate to form a stable dual-polarization radiation communication mode. Specifically, the inner core at one end of the coaxial feeding post 24 passes through the high-frequency radiator 21 and is connected to the Γ-shaped coupling feeding branch 22, and the inner core at the other end of the coaxial feeding post 24 passes through the first metal floor and is connected to the second power distribution network. The first power distribution network is the same as the second power distribution network.

[0023] When external electromagnetic waves irradiate on the second coupling slot 23, induced currents will be generated in the second coupling slot 23, and then a transmission mode will be formed in the Γ-shaped coupling feeding branch 22, and the signal will be transmitted to the feeder port connected to the second power distribution network through the coaxial feeding post 24; when transmitting signals, the high-frequency current input at the feeder port forms a specific electromagnetic field distribution in the Γ-shaped feeding branch, and the second coupling slot 23 will generate an equivalent magnetic current source, thereby exciting an electromagnetic field around the second coupling slot 23, so as to realize the radiation or reception of electromagnetic waves.

[0024] When transmitting signals, the two power distribution networks distribute the feeding signals to each low-frequency antenna unit 1 and high-frequency antenna unit 2 according to the pre-designed power distribution ratio and phase relationship. Under the excitation of the feeding signals, each antenna unit converts the radio frequency signal into electromagnetic waves and radiates them into space. When receiving signals, the electromagnetic waves in space are received by each antenna unit, converted into radio frequency electrical signals, and these electrical signals are synthesized through the power distribution network and then transmitted to the receiver for subsequent processing such as amplification and demodulation.

[0025] Specifically, there are eight low-frequency radiators 11, and the eight low-frequency radiators 11 form a 2×4 antenna array in the low-frequency band; the dielectric plates of the high-frequency antenna units 2 are embedded on the low-frequency radiators 11, and the four Γ-shaped coupling feeding branches 22 on each dielectric plate are distributed in sequence by rotating 90° around the center of the low-frequency radiator 11. The high-frequency radiator 21 and the low-frequency radiator 11 are in the same plane, and are differentially fed by the coaxial feeding post 24 to realize the dual polarization of the high-frequency radiator 21; the high-frequency antenna units 2 located on the low-frequency radiators 11 are placed within the low-frequency antenna aperture to form a 4×8 antenna array in order to avoid the radiation occlusion of the low-frequency antenna units 1.

[0026] The back C-shaped feeding metal plate 17 is a metal plate provided with two symmetrically distributed hollow parts, and openings are provided on the opposite sides of the two hollow parts.

[0027] Specifically, the split ring resonator includes a large split ring resonator 14 and a small split ring resonator 15. The small split ring resonator 15 is located inside the large split ring resonator 14, and the opening directions of the small split ring resonator 15 and the large split ring resonator 14 are the same. On one side of each feeding substrate 12, there are two groups of split ring resonators. The two groups of split ring resonators are symmetrically located, and the opening directions of the two groups of split ring resonators are opposite. More specifically, the split ring resonators are correspondingly located at the positions of the hollow parts of the back C-shaped feeding metal plate 17. The inductance (L) and capacitance (C) of the large split ring resonator 14 and the small split ring resonator 15 themselves and between each other form a resonant circuit. When the resonant frequency of the circuit is equal to the frequency to be notch-filtered, the LC circuit will resonate. At this time, the circuit presents a very high impedance to the signal of this frequency, which is equivalent to forming an "open circuit" in the transmission path of the antenna, preventing the signal of this frequency from being transmitted or received through the antenna, so as to achieve the filtering function. The nested large and small split ring resonators 15 interact with each other to form coupled resonance, forming an out-of-band suppression effect on the non-working frequency band. The two fit together to form a stable combination for realizing the dual-mode filtering characteristics of the antenna.

[0028] Specifically, the large split ring resonator 14 is a ring structure with an opening on one side, and the small split ring resonator 15 is also a ring structure with an opening on one side. The two ends of the opening of the small split ring resonator 15 extend into the ring structure, forming a concave opening.

[0029] Specifically, two symmetric first coupling slits 18 are provided on each feeding substrate 12, and the two first coupling slits 18 are respectively located on the opposite sides of the two groups of split ring resonators.

[0030] Specifically, the feeding branch line 16 on each feeding substrate 12 is arranged in an S shape. The feeding branch line 16 is provided on the circumferential side of each group of split ring resonators except the opening side, and the two ends of the feeding branch line 16 respectively pass through the two first coupling slits 18.

[0031] Specifically, both the low-frequency radiator 11 and the feeding substrate 12 adopt F4B high-frequency dielectric plates with a dielectric constant ɛ = 2.0 - 4.0, and the thickness T of the low-frequency radiator 11 and the feeding substrate 12 is 1.0 - 4.0 mm.

[0032] The center distance dr between two adjacent low-frequency radiators 11 is 135 - 265 mm.

[0033] Specifically, the PCB floor 13 includes a dielectric layer, and a second metal floor 25 and metal patches 31 disposed on both sides of the dielectric layer respectively. There are N (N≥81) metal patches 31, and the multiple metal patches 31 are arranged in a rectangular array. Four pairs of equi-length slits are provided along the circumferential side of the metal patch 31, and the part of the metal patch 31 between two slits is the stub of the metal patch 31. The positions of the second metal floor 25 correspond to those of the metal patches 31 in terms of quantity.

[0034] More specifically, a metal shorting post is connected to the center position of each metal patch 31, and the end of the metal shorting post far from the metal patch 31 penetrates through the dielectric layer and is electrically connected to the second metal floor 25.

[0035] The multiple metal patches 31 are printed on the upper surface of the dielectric layer to form a periodic metasurface structure 3. One metal patch 31 and the second metal floor 25 are connected to form a metasurface unit. The metasurface unit is equivalent to a circuit element with a specific reactance value. The reactances of these circuit elements can interact with the coupling reactance between the low-frequency antenna elements 1. By reasonably designing the reactance value of the metasurface unit, a cancellation or compensation relationship can be formed with the coupling reactance. Therefore, when there is capacitive coupling between the antenna elements, the metasurface unit can provide inductive reactance, and the two cancel each other out, reducing the coupling degree, thereby realizing the miniaturization of the antenna.

[0036] The periodic repetition of the metasurface units forms a spatial periodic modulation. By spatially encoding the metasurface units, multi-dimensional regulation of electromagnetic waves such as phase, amplitude, polarization, and dispersion can be achieved. Spatial encoding means adjusting parameters such as the metasurface unit structure, unit size, and unit spacing. Therefore, in the present invention, by adjusting the symmetric and uniform arrangement of the metasurface units, the coupling path can be disrupted, and the energy leakage can be reduced, thereby achieving a low-coupling effect between the array antennas.

[0037] The slits etched around the metal patch 31 can couple with the slits of adjacent metasurface units, effectively restricting the transmission path of the surface wave, and thus significantly improving the isolation performance between the antenna elements of the array antenna.

[0038] Inserting a metasurface unit layer into the array of low-frequency antenna elements 1, using the Bragg scattering or photonic crystal bandgap effect of the periodic metasurface structure 3 to suppress the propagation of electromagnetic waves in a specific frequency band, forming an isolation band, reducing the mutual coupling between the low-frequency antenna elements 1, and improving the array gain and directivity.

[0039] More specifically, the center-to-center spacing ds between two adjacent metal patches 31 is 14 to 28 mm, and the side length dm of each metal patch 31 is 15 to 25 mm. By adjusting key variables such as the size parameters of the metal patches 31 (the dm range is set to 15.0 to 25.0 mm) and the element spacing (the ds range is set to 14.0 to 28.0 mm), specific scattering and interference phenomena of electromagnetic waves occur on the metasurface elements. This can reduce the scattering of electromagnetic waves in other unwanted directions, effectively suppress the propagation of electromagnetic waves within the specified frequency band, thereby reducing the coupling effect caused by electromagnetic wave scattering between different components or systems, achieving electromagnetic isolation between different units or modes, and achieving a decoupling effect. The periodic metasurface structure 3 is used to concentrate the electromagnetic waves radiated by the antenna in a specific direction, reducing interference with other surrounding electronic components and achieving low coupling.

[0040] The simulation software ANSYS HFSS is used to perform simulation calculations on the array antenna of the present invention. Figure 6 This is the simulation calculation of the S parameters of the low-frequency antenna unit 1 of the present invention. Taking the active return loss less than -10 dB as the standard, it provides the impedance characteristics and filtering characteristics of the antenna's operating frequency band. It can be seen from the figure that the low-frequency antenna unit 1 of the present invention has a good operating bandwidth and a filtering mode for suppressing out-of-band signals in the range of 0.85 GHz to 1.0 GHz. Figure 7 This is the simulation calculation of the S parameters of the high-frequency antenna unit 2 of the present invention. It can be seen from the figure that the high-frequency antenna of the present invention has a good operating bandwidth in the 5G frequency band.

[0041] Figures 8 - 9 This is the normalized two-dimensional radiation pattern of the array antenna of the present invention at each resonant point. The directions at each resonant point are shown in the figure, indicating that the present invention has good radiation characteristics and directional radiation characteristics. By comparing the simulation results in the figure, it can be seen that the low-frequency antenna unit 1 and the high-frequency antenna unit 2 of the present invention have stable gain, radiation pattern, and a small cross-polarization level, and can achieve multi-directional, long-distance, and large-data communication.

[0042] Figure 10 ​​It is the isolation S-parameter diagram between the low-frequency antenna elements 1. It can be seen that the isolation degree within the working frequency band is less than -30 dB, which can effectively reduce the crosstalk between antenna elements, ensure that the radiation characteristics and directions of each element are not significantly affected by other elements, and thus improve the performance indicators such as the pointing accuracy, gain stability, and signal resolution ability of the array antenna. According to the working mechanism that the metasurface is composed of periodic or non-periodic arrangements of structural units at the sub-wavelength scale (less than the wavelength), a high-impedance surface (periodic metasurface unit structure) is set on the PCB floor 13 of the low-frequency antenna element 1 to block the surface wave coupling in a specific frequency band, which can block the electromagnetic coupling path between the low-frequency antenna elements 1, effectively improve the radiation characteristics of the antenna, and increase the gain of the antenna.

[0043] Although the embodiments of the present invention have been shown and described, various changes, modifications, substitutions, and variations can be made to these embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A common aperture filtering dual-polarization array antenna, characterized in that: The invention comprises a low-frequency antenna unit (1) and a high-frequency antenna unit (2), wherein the low-frequency antenna unit (1) comprises a plurality of low-frequency radiators (11) and a PCB floor (13), wherein the plurality of low-frequency radiators (11) are arranged in a rectangular array, and two feeding substrates (12) arranged in a cross pattern are provided between each low-frequency radiator (11) and the PCB floor (13), wherein one side of the feeding substrate (12) is provided with an open resonant ring and a feeding branch line (16), and the other side of the feeding substrate (12) is provided with a back C-shaped feeding metal plate (17) and a first coupling slot (18), wherein a part of the line of the feeding branch line (16) covers the first coupling slot (18), and the feeding branch line (16) is connected to a first power distribution network; Each low-frequency radiator (11) is provided with four high-frequency antenna units (2) arranged in a rectangular array. The high-frequency antenna unit (2) comprises a dielectric plate, a first metal floor and a coaxial feeding pillar (24). The upper surface of the dielectric plate is provided with a high-frequency radiator (21), and the lower surface of the dielectric plate is provided with four Γ-shaped coupling feeding branches (22) evenly arranged along the circumferential direction. The high-frequency radiator (21) is provided with a second coupling slot (23). The number and position of the coaxial feeding pillars (24) correspond to those of the Γ-shaped coupling feeding branches (22). The inner core and the outer core at one end of the coaxial feeding pillar (24) are respectively connected to the Γ-shaped coupling feeding branches (22) and the high-frequency radiator (21), and the inner core and the outer core at the other end of the coaxial feeding pillar (24) are respectively connected to the second power distribution network feed and the first metal floor.

2. The common aperture filtering dual-polarization array antenna according to claim 1, characterized in that: The open resonant ring comprises a large open resonant ring (14) and a small open resonant ring (15), wherein the small open resonant ring (15) is located inside the large open resonant ring (14), and the opening directions of the small open resonant ring (15) and the large open resonant ring (14) are the same; Two groups of open resonant rings are provided on one side of each of the feed substrates (12); the two groups of open resonant rings are symmetrically positioned, and the opening directions of the two groups of open resonant rings are opposite.

3. The common aperture filtering dual-polarization array antenna according to claim 2, characterized in that: Two symmetrical first coupling slots (18) are provided on each of the feed substrates (12), and the two first coupling slots (18) are respectively located on opposite sides of two groups of open resonant rings.

4. The common aperture filtering dual-polarization array antenna according to claim 2, characterized in that: The feed branch line (16) on each feed substrate (12) is arranged in an S shape, and each group of open resonant rings is provided with the feed branch line (16) on the periphery except the open side, and both ends of the feed branch line (16) pass through two first coupling slots (18) respectively.

5. The common aperture filtering dual-polarization array antenna according to claim 1, characterized in that: The number of the second coupling slots (23) corresponds to the number of the positions of the Γ-shaped coupling feeding branches (22).

6. The common aperture filtering dual-polarization array antenna according to claim 1, characterized in that: The low-frequency radiator (11) and the feed substrate (12) both adopt an F4B high-frequency dielectric plate with a dielectric constant ɛ=2.0-4.0, and the low-frequency radiator (11) and the feed substrate (12) have a thickness T=1.0-4.0 mm.

7. The common aperture filtering dual-polarization array antenna according to claim 1, characterized in that: The center distance between two adjacent low-frequency radiators (11) is dr=135-265 mm.

8. The common aperture filtering dual-polarization array antenna according to claim 1, characterized in that: The PCB floor (13) comprises a dielectric layer and a second metal floor (25) and metal patches (31) respectively arranged on both sides of the dielectric layer. The metal patches (31) are N (N≥81) in number. The plurality of metal patches (31) are arranged in a rectangular array. Four pairs of equal-length slits are arranged on the circumference of the upper edge of the metal patches (31). The second metal floor (25) corresponds in number and position to the metal patches (31).

9. The common aperture filtering dual-polarization array antenna according to claim 8, characterized in that: A metal short-circuit column is connected to the center of each metal patch (31), and one end of the metal short-circuit column away from the metal patch (31) penetrates the dielectric layer and is electrically connected to the second metal floor (25).

10. The common aperture filtering dual-polarization array antenna according to claim 8, characterized in that: The center distance between two adjacent metal patches (31) is ds=14-28 mm, and the side length of each metal patch (31) is dm=15-25 mm.

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