A single-layer structure same-frequency and different-frequency decoupling surface and a dual-polarized dual-band base station antenna

Abstract

A single-layer structure same-frequency and different-frequency decoupling surface and a dual-polarization dual-band base station antenna, which relates to the field of antennas, comprises a dual-function decoupling surface, a low-frequency antenna assembly, a high-frequency antenna assembly, and a feeding assembly; the dual-function decoupling surface is printed on the upper surface of a first dielectric plate and comprises a plurality of cross-shaped structure units in a central region, a plurality of Jerusalem cross structures in a peripheral region, and a plurality of H-shaped structures in an outermost layer; the cross-shaped structure units in the center are combined with the low-frequency antenna assembly to make the high-frequency band radiation wave normally penetrate and repair the high-frequency antenna pattern distortion; the Jerusalem cross structures in the periphery and the H-shaped structures introduce additional coupling paths to improve the high-frequency antenna port isolation; the low-frequency antenna assembly is located above the high-frequency antenna assembly, and the low-frequency antenna assembly changes the low-frequency reflected wave phase by using the high-frequency antenna assembly to reduce the profile height thereof; the antenna different-frequency port isolation is greater than 21.9 dB, and the same-frequency port isolation is greater than 20.2 dB.

Description

Technical Field

[0001] This invention relates to the field of antenna technology, and in particular to a single-layer structure for decoupling surfaces of the same and different frequencies and a dual-polarized dual-band base station antenna. Background Technology

[0002] In practical applications of 5G, on the one hand, due to the relatively short wavelength of 5G antennas, more 5G antennas need to be deployed to improve 5G signal coverage; on the other hand, the commercialization of 5G will not lead to the discontinuation of 2G / 3G / 4G technologies in the short term. Therefore, in order to ensure 5G signal coverage and effective resource utilization, base station antennas supporting different standards such as 4G / 5G need to be installed within limited antenna covers.

[0003] To address these issues, one solution is to arrange antennas of different frequency bands within the same aperture, forming a multi-band common-aperture antenna. Common layout methods include side-by-side, embedded, and stacked layouts. To save space and costs, a stacked layout with low-frequency antennas on top can be used. However, due to the obstruction of low-frequency antennas, this layout can lead to distortion of the high-frequency antenna pattern. Furthermore, with the development of 5G technology, traditional antenna arrays are being replaced by multiple-input multiple-output (MIMO) arrays. The antenna element spacing has decreased from 0.7~0.9 λ0 to 0.5 λ0. On the one hand, the reduced spacing will enhance the in-band coupling of the antenna array and reduce antenna port isolation. On the other hand, the denser layout will cause the low-frequency antennas to obstruct the high-frequency antennas more severely, making high-frequency antenna pattern restoration more difficult.

[0004] To address these issues, some scholars have proposed methods such as filters and partial reflective surfaces (PRS) for pattern restoration, and metal baffles and array decoupling surfaces (ADS) for improving antenna port isolation. However, these methods often require additional dielectric layers, increasing the antenna profile height. Furthermore, in MIMO arrays, the limited available space and stronger coupling pose challenges to these methods. Summary of the Invention

[0005] The purpose of this invention is to solve the aforementioned problems in the prior art and provide a single-layer co-frequency and inter-frequency decoupling surface and a dual-polarized dual-band base station antenna, including one low-frequency antenna and nine high-frequency antennas. The low-frequency antenna operates in the 1.7~2.3GHz frequency band, and the high-frequency antennas operate in the 4.4~5GHz frequency band. A single dual-function decoupling surface simultaneously achieves pattern repair and improved co-frequency isolation. The dual-function decoupling surface is printed directly on the surface of the low-frequency antenna dielectric substrate. The frequency-selective surface element at the center of the dual-function decoupling surface allows the high-frequency antenna radiated waves to pass through normally, thereby repairing problems such as pattern distortion caused by low-frequency antenna blockage. The periphery of the dual-function decoupling surface adds additional coupling paths in the high-frequency band, thereby improving the isolation between high-frequency antennas. The inter-frequency port isolation is greater than 21.9 dB, and the co-frequency port isolation is greater than 20.2 dB. This invention's low-frequency antenna utilizes the high-frequency antenna to change the phase of the low-frequency reflected wave, effectively reducing the overall antenna profile height.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A single-layer co-frequency and co-frequency decoupling surface and a dual-polarized dual-band base station antenna are disclosed, comprising a dual-function decoupling surface, a low-frequency antenna assembly, a high-frequency antenna assembly, a feeding assembly, and a support assembly. The dual-function decoupling surface is printed on the upper surface of a first dielectric substrate in the low-frequency antenna assembly, including multiple cross-shaped structural units in the central region, multiple Jerusalem cross structures in the peripheral region, and multiple H-shaped structures in the outermost layer. The central cross-shaped structural units are combined with the low-frequency antenna assembly to allow normal transmission of high-frequency radiated waves and correct high-frequency antenna pattern distortion. The peripheral Jerusalem cross structures and H-shaped structures introduce additional coupling paths to improve the isolation of the high-frequency antenna port. The low-frequency antenna assembly is located above the high-frequency antenna assembly and utilizes the high-frequency antenna assembly to change the phase of the low-frequency reflected wave to reduce its own profile height. The feeding assembly includes a low-frequency feeding coaxial line and a high-frequency feeding coaxial line, which provide power to the low-frequency antenna assembly and the high-frequency antenna assembly, respectively. The support assembly is located between the low-frequency antenna assembly and the high-frequency antenna assembly and is used to support and fix the above components.

[0008] The dual-function decoupling surface printed on the low-frequency antenna assembly includes 24 cross-shaped structural units in the central region, 8 Jerusalem cross structures in the outer region, and 12 H-shaped structures in the outermost layer.

[0009] The low-frequency antenna assembly includes a low-frequency antenna radiator and a low-frequency antenna Y-shaped feed structure. The low-frequency antenna radiator is printed on the lower surface of the first dielectric substrate, and the low-frequency antenna Y-shaped feed structure is printed on the upper surface of the first dielectric substrate.

[0010] The upper outer conductor of the low-frequency feed coaxial line is connected to the low-frequency antenna radiator in the low-frequency antenna assembly, and the inner conductor is connected to the low-frequency antenna Y-shaped feed structure in the low-frequency antenna assembly; the lower outer and inner conductors of the low-frequency feed coaxial line are connected to an external feed source; the middle part of the outer conductor of the low-frequency antenna feed coaxial line is connected to the third dielectric metal layer in the support assembly.

[0011] The outer conductor of the high-frequency feeding coaxial line connects the high-frequency antenna radiator in the high-frequency antenna assembly and the fourth dielectric metal ground in the feeding assembly. The inner conductor of the high-frequency feeding coaxial line connects the high-frequency antenna U-shaped feeding structure in the high-frequency antenna assembly and the one-to-two differential power divider in the feeding assembly. The outer conductor of the high-frequency feeding coaxial line is not connected to the third dielectric metal layer in the support assembly.

[0012] The high-frequency antenna assembly includes multiple arrayed high-frequency antenna radiators and corresponding high-frequency antenna U-shaped feed structures. Each high-frequency antenna radiator is printed on the lower surface of the second dielectric substrate, and the corresponding high-frequency antenna U-shaped feed structure is printed on the upper surface of the second dielectric substrate.

[0013] The support assembly includes a third dielectric plate and copper pillars. The upper surface of the third dielectric plate is provided with a metal layer and has multiple through holes. The copper pillars are installed on the third dielectric plate.

[0014] The power supply assembly also includes a fourth dielectric board, the upper surface of which is printed with a metal ground, and the lower surface of which is printed with a one-to-two differential power divider.

[0015] The antenna has an inter-frequency port isolation greater than 21.9 dB and an intra-frequency port isolation greater than 20.2 dB.

[0016] The application of the single-layer structure of the same-frequency and different-frequency decoupling surface and the dual-polarized dual-band base station antenna described above is applied to 5G MIMO base station antenna arrays.

[0017] Compared with the prior art, the beneficial effects achieved by the technical solution of this invention are:

[0018] (1) The present invention relates to a single-layer structure of a decoupling surface for the same frequency and different frequency and a dual-polarized dual-band base station antenna, wherein the low-frequency antenna uses a high-frequency antenna array to change the phase of the low-frequency reflected wave and reduces the profile height of the low-frequency antenna.

[0019] (2) The present invention relates to a single-layer structure of a decoupling surface for the same frequency and different frequency and a dual-polarized dual-band base station antenna, the profile height of which is the profile height of a low-frequency antenna and the overall antenna height is low;

[0020] (3) The present invention relates to a single-layer structure of same-frequency and different-frequency decoupling surface and a dual-polarized dual-band base station antenna, which uses a dual-function decoupling surface to repair the blocking effect of low-frequency antenna on high-frequency antenna and realize the conformal protection of high-frequency antenna pattern;

[0021] (4) The present invention relates to a single-layer structure of same-frequency and different-frequency decoupling surface and a dual-polarized dual-band base station antenna, which uses a dual-function decoupling surface to reduce coupling between high-frequency antennas and improve port isolation.

[0022] (5) The present invention relates to a single-layer structure of co-frequency and inter-frequency decoupling surface and dual-polarized dual-band base station antenna, which achieves pattern repair and co-frequency port isolation improvement without adding profile and dielectric layer. The inter-frequency port isolation of the antenna is greater than 21.9 dB and the co-frequency port isolation is greater than 20.2 dB, which can be applied to 5G MIMO base station antenna array. Attached Figure Description

[0023] Figure 1 This is an exploded structural diagram of the present invention;

[0024] Figure 2 This is a schematic diagram of the port of the present invention;

[0025] Figure 3 This is a schematic diagram of the etched metal structure on the upper and lower surfaces of the first dielectric substrate; where, Figure 3 The left side of the middle section shows a schematic diagram of the etched metal structure on the upper surface of the first dielectric substrate. Figure 3 The diagram on the right shows the etched metal structure on the lower surface of the first dielectric substrate;

[0026] Figure 4 This is a schematic diagram of the etched metal structure on the upper and lower surfaces of the second dielectric substrate; where, Figure 4 The left side of the middle section shows a schematic diagram of the etched metal structure on the upper surface of the second dielectric substrate. Figure 4 The diagram on the right shows the etched metal structure on the lower surface of the second dielectric substrate;

[0027] Figure 5 This is a schematic diagram of the etched metal structure on the upper and lower surfaces of the third dielectric substrate; where, Figure 5 The left side of the middle section shows a schematic diagram of the etched metal structure on the upper surface of the third dielectric substrate. Figure 5 The diagram on the right shows the etched metal structure on the lower surface of the third dielectric substrate;

[0028] Figure 6 This is a schematic diagram of the etched metal structure on the upper and lower surfaces of the fourth dielectric substrate; where, Figure 6 The left side of the middle section shows a schematic diagram of the etched metal structure on the upper surface of the fourth dielectric substrate. Figure 6 The diagram on the right shows the etched metal structure on the lower surface of the fourth dielectric substrate;

[0029] Figure 7 The figure shows the simulation and test results of the S-parameters and gain of the low-frequency antenna as a function of frequency.

[0030] Figure 8 The figures show the simulation and test results of the S-parameters and gain of the high-frequency antenna as a function of frequency.

[0031] Figure 9 The figure shows the simulation and test results of the port isolation of low-frequency and high-frequency antennas as a function of frequency in the low-frequency band.

[0032] Figure 10 The figure shows the simulation and test results of the port isolation of low-frequency and high-frequency antennas as a function of frequency in the high-frequency band.

[0033] Figure 11 The figure shows the simulation and test results of the co-polarization isolation of the high-frequency antenna port as a function of frequency.

[0034] Figure 12 The figure shows the simulation and test results of the heteropolarization isolation of the high-frequency antenna port as a function of frequency.

[0035] Figure 13 Simulation and test results of the E-plane and H-plane radiation patterns of a low-frequency antenna at 2.2 GHz when fed by port L1;

[0036] Figure 14 Simulation and test results of the E-plane and H-plane radiation patterns of the high-frequency antenna at 4.6 GHz when fed by port H3;

[0037] Figure 15 For high-frequency antennas at port H 11 Simulation and test results of E-plane and H-plane radiation patterns at 4.6 GHz frequency when powered;

[0038] Figure 16 For high-frequency antennas at port H 15 Simulation and test results of the E-plane and H-plane radiation patterns at 4.6 GHz frequency when powered. Detailed Implementation

[0039] To make the technical problems, technical solutions and beneficial effects of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0040] like Figures 1 to 6 As shown, this embodiment of the invention includes a dual-function decoupling surface, a low-frequency antenna assembly, a high-frequency antenna assembly, a feed assembly, and a support assembly. Ports L1 and L2 are low-frequency antenna feed ports, and ports H3~H... 20This is the feed port for the high-frequency antenna; the low-frequency antenna assembly is located above the high-frequency antenna assembly, and the low-frequency antenna assembly uses the high-frequency antenna assembly to change the phase of the low-frequency reflected wave to reduce its own profile height.

[0041] The low-frequency antenna assembly includes a first dielectric substrate 1, a low-frequency antenna Y-shaped feed structure 5, and a low-frequency antenna radiator 9. Specifically, the dual-function decoupling surface and the low-frequency antenna Y-shaped feed structure 5 are printed on the upper surface of the first dielectric substrate 1. To avoid using jumpers at the intersection of the low-frequency antenna Y-shaped feed structure, the low-frequency antenna radiator 9 is printed on the lower surface of the first dielectric substrate 1. The low-frequency antenna radiator 9 is a ring dipole antenna.

[0042] The dual-function decoupling surface includes 24 cross-shaped structural units 6 at the center, 8 Jerusalem cross structures 7 on the periphery, and 12 H-shaped structures 8 on the outermost layer. In this way, high-frequency band radiation waves can pass through normally, and the distortion of the high-frequency antenna pattern is repaired. The Jerusalem cross structures and H-shaped structures on the periphery introduce additional coupling paths and improve the isolation of the high-frequency antenna port.

[0043] The high-frequency antenna assembly includes nine second dielectric substrates 2, a high-frequency antenna U-shaped feed structure 11, and a high-frequency antenna radiator 12 for a patch antenna; specifically, four high-frequency antenna U-shaped feed structures 11 are printed on the upper surface of each second dielectric substrate 2, and the high-frequency antenna radiator 12 is printed on the lower surface of the second dielectric substrate 2; specifically, the high-frequency antenna radiators of the present invention are arranged in an array.

[0044] The support assembly is located between the low-frequency antenna assembly and the high-frequency antenna assembly, and is used to support and fix the above-mentioned components. It includes a third dielectric plate 3 and four copper pillars 21 installed on the third dielectric plate 3. The upper surface of the third dielectric plate 3 is printed with a metal layer 15.

[0045] The power supply assembly includes a low-frequency power supply coaxial line 25, a high-frequency power supply coaxial line 26, and nine fourth dielectric plates 4; the upper surface of each fourth dielectric plate 4 is printed with a metal ground 22, and the metal ground 22 is provided with non-metallized vias 23 for mounting the high-frequency power supply coaxial line; the lower surface of the fourth dielectric plate 4 is printed with two 1-to-2 differential power supply dividers 24.

[0046] The upper outer conductor of the low-frequency antenna feed coaxial line 25 is connected to the low-frequency antenna radiator 9, and the inner conductor is connected to the low-frequency antenna Y-shaped feed structure 5; the lower outer conductor and inner conductor of the low-frequency antenna feed coaxial line 25 are connected to an external feed source; the middle part of the outer conductor of the low-frequency antenna feed coaxial line 25 is connected to the metal layer 15 of the third dielectric substrate 3.

[0047] The outer conductor of the high-frequency antenna feed coaxial line 26 is connected to the high-frequency antenna radiator 12 and the metal ground 22 of the fourth dielectric substrate 4. The inner conductor of the high-frequency antenna feed coaxial line 26 is connected to the high-frequency antenna U-shaped feed structure 11 and the one-to-two differential feed power divider 24. The outer conductor of the high-frequency antenna feed coaxial line 26 is not connected to the metal layer 15 of the third dielectric substrate 3.

[0048] The first dielectric substrate 1 has four non-metallic vias 10 for mounting supporting nylon pillars on its periphery; the second dielectric substrate 2 has four non-metallic vias 13 for mounting supporting nylon pillars on its periphery; the second dielectric substrate 2 has a non-metallic via 14 at its center for mounting a Y-shaped feed structure for a low-frequency antenna; the third dielectric substrate 3 has four non-metallic vias 16 for mounting supporting nylon pillars of the first dielectric substrate; the third dielectric substrate 3 has 36 non-metallic vias 17 for mounting supporting nylon pillars of the second dielectric substrate; the third dielectric substrate 3 has two non-metallic vias 18 for the low-frequency antenna feed coaxial line to pass through; the third dielectric substrate 3 has 36 non-metallic vias 19 for the high-frequency antenna feed coaxial line to pass through; and the third dielectric substrate 3 has four non-metallic vias 20 for mounting copper pillars.

[0049] like Figure 7 The figure shown is a simulation and test result of the S-parameters and gain of the low-frequency antenna as a function of frequency according to an embodiment of the present invention. The operating frequency band of the low-frequency antenna is 1.7~2.3GHz. The return loss in the simulation and test within the operating bandwidth is less than -10dB, the port isolation in the test is less than -25dB, and the average gain in the test is 7.8dBi.

[0050] like Figure 8 The figure shown is a simulation and test result graph of the S-parameters and gain of the high-frequency antenna as a function of frequency according to an embodiment of the present invention. The high-frequency antenna operates in the frequency band of 4.4~5GHz. The return loss in both simulation and test within the operating bandwidth is less than -10dB, and the tested port isolation is less than -25dB. Port H3 and port H 11 and port H 15 The average gains tested were 5.1 dBi, 5.8 dBi, and 6.2 dBi, respectively.

[0051] like Figure 9 The figure shown is a simulation and test result diagram of the port isolation of the low-frequency antenna and the high-frequency antenna in the embodiment of the present invention as a function of frequency in the low-frequency band. The tested port isolation values ​​are all below -25.5dB.

[0052] like Figure 10The figure shown is a simulation and test result diagram of the port isolation of the low-frequency antenna and the high-frequency antenna in the embodiment of the present invention as a function of frequency in the high-frequency band. The tested port isolation values ​​are all lower than -21.9dB.

[0053] like Figure 11 The figure shown is a simulation and test result diagram of the co-polarization isolation of the high-frequency antenna port as a function of frequency according to an embodiment of the present invention. The tested port isolation values ​​are all below -21.8dB.

[0054] like Figure 12 The figure shown is a simulation and test result diagram of the high-frequency antenna port polarization isolation degree as a function of frequency according to an embodiment of the present invention. The tested port isolation degree values ​​are all lower than -20.2dB.

[0055] like Figure 13 The figure shown is a simulation and test result diagram of the low-frequency antenna at 2.2GHz E-plane and H-plane radiation patterns according to an embodiment of the present invention. The low-frequency antenna radiation pattern shows a directional radiation mode, and the cross-polarization in the simulation and measurement is less than -19dB.

[0056] like Figure 14 The figure shown is a simulation and test result diagram of the E-plane and H-plane radiation patterns of the high-frequency antenna at 4.6 GHz when fed by port H3 according to an embodiment of the present invention. The low-frequency antenna radiation pattern shows a directional radiation mode, and the cross-polarization in the simulation and measurement is less than -15.3 dB.

[0057] like Figure 15 As shown, this is a high-frequency antenna at port H according to an embodiment of the present invention. 11 Simulation and test results of E-plane and H-plane radiation patterns at 4.6 GHz frequency when powered. The low-frequency antenna radiation pattern shows a directional radiation mode, and the cross-polarization in simulation and measurement is less than -12.6 dB.

[0058] like Figure 16 As shown, this is a high-frequency antenna at port H according to an embodiment of the present invention. 15 Simulation and test results of E-plane and H-plane radiation patterns at 4.6 GHz frequency when powered. The low-frequency antenna radiation pattern shows a directional radiation mode, and the cross-polarization in simulation and measurement is less than -12.9 dB.

[0059] Experiments show that the single-layer structure of the same-frequency and different-frequency decoupling surface and the dual-polarized dual-band base station antenna of the present invention utilize a high-frequency antenna array to change the phase of the low-frequency reflected wave, thereby reducing the profile height of the low-frequency antenna. The profile height of the antenna of the present invention is the same as that of the low-frequency antenna, and the profile height is relatively low. The antenna of the present invention uses a dual-function decoupling surface to repair the obstruction effect of the low-frequency antenna on the high-frequency antenna, thereby achieving conformal protection of the high-frequency antenna pattern. The antenna of the present invention uses a dual-function decoupling surface to reduce the coupling between high-frequency antenna elements and improve port isolation. The antenna of the present invention has a different-frequency port isolation greater than 21.9 dB and a same-frequency port isolation greater than 20.2 dB, achieving a good decoupling effect and can be applied to 5G MIMO base station antenna arrays.

[0060] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to these embodiments. Any modifications, combinations and simplifications made without departing from the principles and essence of the present invention are included within the protection scope of the present invention.

Claims

1. A single-layer structure for decoupling co-frequency and hetero-frequency signals and a dual-polarized dual-band base station antenna, characterized in that: The system includes a dual-functional decoupling surface, a low-frequency antenna assembly, a high-frequency antenna assembly, a feeding assembly, and a support assembly. The dual-functional decoupling surface is printed on the upper surface of the first dielectric substrate in the low-frequency antenna assembly. It includes multiple cross-shaped structural units in the central region, multiple Jerusalem cross structures in the peripheral region, and multiple H-shaped structures in the outermost layer. The central cross-shaped structural units are combined with the low-frequency antenna assembly to allow high-frequency radiated waves to pass through normally and to correct the high-frequency antenna pattern distortion. The peripheral Jerusalem cross structures and H-shaped structures introduce additional coupling paths to improve the isolation of the high-frequency antenna port. The low-frequency antenna assembly is located above the high-frequency antenna assembly. The low-frequency antenna assembly uses the high-frequency antenna assembly to change the phase of the low-frequency reflected wave to reduce its own profile height. The feeding assembly includes a low-frequency feeding coaxial line and a high-frequency feeding coaxial line, which provide power to the low-frequency antenna assembly and the high-frequency antenna assembly, respectively. The support component is located between the low-frequency antenna component and the high-frequency antenna component, and is used to support and fix the above components.

2. The single-layer structure of the same-frequency and different-frequency decoupling surface and the dual-polarized dual-band base station antenna as described in claim 1, characterized in that: The dual-function decoupling surface printed on the low-frequency antenna assembly includes 24 cross-shaped structural units in the central region, 8 Jerusalem cross structures in the outer region, and 12 H-shaped structures in the outermost layer.

3. The single-layer structure of the same-frequency and different-frequency decoupling surface and the dual-polarized dual-band base station antenna as described in claim 1, characterized in that: The low-frequency antenna assembly includes a low-frequency antenna radiator and a low-frequency antenna Y-shaped feed structure. The low-frequency antenna radiator is printed on the lower surface of the first dielectric substrate, and the low-frequency antenna Y-shaped feed structure is printed on the upper surface of the first dielectric substrate.

4. The single-layer structure of the same-frequency and different-frequency decoupling surface and the dual-polarized dual-band base station antenna as described in claim 1, characterized in that: The upper outer conductor of the low-frequency feed coaxial line is connected to the low-frequency antenna radiator in the low-frequency antenna assembly, and the inner conductor is connected to the low-frequency antenna Y-shaped feed structure in the low-frequency antenna assembly; the lower outer and inner conductors of the low-frequency feed coaxial line are connected to an external feed source; the middle part of the outer conductor of the low-frequency feed coaxial line is connected to the third dielectric metal layer in the support assembly.

5. The single-layer structure of the same-frequency and different-frequency decoupling surface and the dual-polarized dual-band base station antenna as described in claim 1, characterized in that: The outer conductor of the high-frequency feeding coaxial line connects the high-frequency antenna radiator in the high-frequency antenna assembly and the fourth dielectric metal ground in the feeding assembly. The inner conductor of the high-frequency feeding coaxial line connects the high-frequency antenna U-shaped feeding structure in the high-frequency antenna assembly and the one-to-two differential power divider in the feeding assembly. The outer conductor of the high-frequency feeding coaxial line is not connected to the third dielectric metal layer in the support assembly.

6. The single-layer structure of the same-frequency and different-frequency decoupling surface and the dual-polarized dual-band base station antenna as described in claim 1, characterized in that: The high-frequency antenna assembly includes multiple arrayed high-frequency antenna radiators and corresponding high-frequency antenna U-shaped feed structures. Each high-frequency antenna radiator is printed on the lower surface of the second dielectric substrate, and the corresponding high-frequency antenna U-shaped feed structure is printed on the upper surface of the second dielectric substrate.

7. The single-layer structure of the same-frequency and different-frequency decoupling surface and the dual-polarized dual-band base station antenna as described in claim 1, characterized in that: The support assembly includes a third dielectric plate and copper pillars. The upper surface of the third dielectric plate is provided with a metal layer and has multiple through holes. The copper pillars are installed on the third dielectric plate.

8. The single-layer structure of the same-frequency and different-frequency decoupling surface and the dual-polarized dual-band base station antenna as described in claim 1, characterized in that: The power supply assembly also includes a fourth dielectric board, the upper surface of which is printed with a metal ground, and the lower surface of which is printed with a one-to-two differential power divider.

9. The single-layer structure of the same-frequency and different-frequency decoupling surface and the dual-polarized dual-band base station antenna as described in claim 1, characterized in that: The antenna has an inter-frequency port isolation greater than 21.9 dB and an intra-frequency port isolation greater than 20.2 dB.

10. The application of a single-layer structure co-frequency and hetero-frequency decoupling surface and a dual-polarized dual-band base station antenna according to any one of claims 1 to 9, characterized in that: It is used in 5G MIMO base station antenna arrays.

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