Same-frequency and pilot-frequency decoupling surface with single-layer structure and dual-polarized dual-band base station antenna

Abstract

The invention discloses a same-frequency and different-frequency decoupling surface with a single-layer structure and a dual-polarization dual-band base station antenna, and relates to the field of antennas, and the same-frequency and different-frequency decoupling surface comprises a dual-function decoupling surface, a low-frequency antenna assembly, a high-frequency antenna assembly, and a feed assembly. The dual-function decoupling surface is printed on the upper surface of the first dielectric plate and comprises a plurality of cross-shaped structure units in a central area, a plurality of Jerusalem cross-shaped structures in a peripheral area and a plurality of H-shaped structures on the outermost layer, and the central cross-shaped structure units are combined with the low-frequency antenna assembly, so that high-frequency band radiation waves can normally penetrate through the dual-function decoupling surface; distortion of a high-frequency antenna pattern is repaired, extra coupling paths are introduced into the Jerusalem cross-shaped structure and the H-shaped structure on the periphery, and the isolation degree of a high-frequency antenna port is improved; the low-frequency antenna assembly is located above the high-frequency antenna assembly, and the low-frequency antenna assembly utilizes the high-frequency antenna assembly to change the phase of a low-frequency reflected wave so as to reduce the profile height of the low-frequency antenna assembly; the isolation degree of different-frequency ports of the antenna is larger than 21.9 dB, and the isolation degree of same-frequency ports of the antenna is larger than 20.2 dB.

Description

Technical Field

[0001] The present invention relates to the technical field of antennas, and in particular to a single-layer structure for co-frequency and cross-frequency decoupling surfaces and a dual-polarization dual-band base station antenna. Background Art

[0002] In the practical application of 5G, on the one hand, since the wavelength of 5G antennas is relatively short, more 5G antennas need to be deployed to improve the coverage of 5G signals; on the other hand, the commercialization of 5G will not cause the 2G / 3G / 4G technologies to stop being used in a short time. Therefore, in order to ensure the coverage of 5G signals and the effective utilization of resources, base station antennas supporting different standards such as 4G / 5G need to be installed in a limited radome.

[0003] For the above problems, one solution is to layout antennas of different frequency bands within the same aperture to form a multi-band co-aperture antenna. Common layout methods include side-by-side layout, embedded layout, and stacked layout. To save space cost, a stacked layout method with low-frequency antennas on top can be adopted. However, due to the occlusion of low-frequency antennas, this layout method will cause distortion of the high-frequency antenna pattern. In addition, with the development of 5G technology, traditional antenna arrays have been replaced by multiple-input multiple-output (MIMO) arrays. The antenna element spacing is reduced from 0.7~0.9 λ 0 to 0.5 λ 0 . On the one hand, the reduction of the spacing will enhance the in-band coupling of the antenna array and reduce the antenna port isolation. On the other hand, a more compact layout will cause more serious occlusion of high-frequency antennas by low-frequency antennas, making it more difficult to repair the high-frequency antenna pattern.

[0004] Currently, in response to these problems, some scholars have proposed methods such as using filters and partially reflecting surfaces (PRS) to achieve pattern repair, and using metal baffles and array decoupling surfaces (ADS) to improve the co-frequency port isolation of antennas. However, these methods often require adding an additional dielectric layer, increasing the antenna profile height. At the same time, in MIMO arrays, less available space and stronger coupling pose challenges to the above methods. Summary of the Invention

[0005] The object of the present invention is to solve the above problems in the prior art, and to provide a single-layer structure for co-frequency and cross-frequency decoupling surface and a dual-polarization dual-band base station antenna, including 1 low-frequency antenna and 9 high-frequency antennas. The working frequency band of the low-frequency antenna is 1.7 - 2.3 GHz, and the working frequency band of the high-frequency antenna is 4.4 - 5 GHz. The pattern repair and improvement of the co-frequency isolation degree are simultaneously achieved through a layer of dual-functional decoupling surface. The dual-functional decoupling surface is printed directly on the upper surface of the low-frequency antenna dielectric board. The frequency selective surface unit at the center of the dual-functional decoupling surface enables the radiation wave of the high-frequency antenna to pass through normally, thereby repairing problems such as pattern distortion of the high-frequency antenna caused by the occlusion of the low-frequency antenna; the periphery of the dual-functional decoupling surface adds an additional coupling path in the high-frequency band, thereby improving the isolation degree between high-frequency antennas. The cross-frequency port isolation degree of the antenna is greater than 21.9 dB, and the co-frequency port isolation degree is greater than 20.2 dB. The low-frequency antenna of the present invention uses the high-frequency antenna to change the phase of the low-frequency reflected wave, effectively reducing the overall profile height of the antenna.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A single-layer structure for co-frequency and cross-frequency decoupling surface and a dual-polarization dual-band base station antenna, including a dual-functional decoupling surface, a low-frequency antenna assembly, a high-frequency antenna assembly, a feeding assembly, and a supporting assembly; the dual-functional decoupling surface is printed on the upper surface of the first dielectric board in the low-frequency antenna assembly, including a plurality of cross-shaped structure units in the central region, a plurality of Jerusalem cross structures in the peripheral region, and a plurality of H-shaped structures in the outermost layer. The cross-shaped structure unit in the center is combined with the low-frequency antenna assembly to enable the radiation wave in the high-frequency band to pass through normally, repairing the pattern distortion of the high-frequency antenna. The peripheral Jerusalem cross structures and H-shaped structures introduce additional coupling paths to improve the isolation degree of the high-frequency antenna ports; 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; the feeding assembly includes a low-frequency feeding coaxial cable and a high-frequency feeding coaxial cable, which respectively provide feeding for the low-frequency antenna assembly and the high-frequency antenna assembly; the supporting 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-functional decoupling surface printed on the low-frequency antenna assembly includes 24 cross-shaped structure units in the central region, 8 Jerusalem cross structures in the peripheral 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 feeding structure. The low-frequency antenna radiator is printed on the lower surface of the first dielectric board, and the low-frequency antenna Y-shaped feeding structure is printed on the upper surface of the first dielectric board.

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

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

[0012] The high-frequency antenna assembly includes a plurality of high-frequency antenna radiators arranged in an array and corresponding high-frequency antenna Г-shaped feeding structures. Each high-frequency antenna radiator is printed on the lower surface of the second dielectric plate, and the corresponding high-frequency antenna Г-shaped feeding structure is printed on the upper surface of the second dielectric plate.

[0013] The support assembly includes a third dielectric plate and copper posts. The upper surface of the third dielectric plate is provided with a metal layer and is provided with a plurality of vias, and the copper posts are installed on the third dielectric plate.

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

[0015] The isolation degree between different-frequency ports of the antenna is greater than 21.9 dB, and the isolation degree between the same-frequency ports is 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-polarization dual-band base station antenna is applied to the 5G MIMO base station antenna array

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

[0018] (1) For the single-layer structure of the same-frequency and different-frequency decoupling surface and the dual-polarization dual-band base station antenna involved in the present invention, the low-frequency antenna uses the high-frequency antenna array to change the phase of the low-frequency reflected wave, reducing the profile height of the low-frequency antenna;

[0019] (2) For the single-layer structure of the same-frequency and different-frequency decoupling surface and the dual-polarization dual-band base station antenna involved in the present invention, its profile height is the profile height of the low-frequency antenna, and the overall antenna height is low;

[0020] (3) A co-frequency and cross-frequency decoupling surface and a dual-polarization dual-band base station antenna with a single-layer structure according to the present invention use a dual-functional decoupling surface to repair the shielding effect of a low-frequency antenna on a high-frequency antenna, and achieve the conformal radiation pattern of the high-frequency antenna.

[0021] (4) A co-frequency and cross-frequency decoupling surface and a dual-polarization dual-band base station antenna with a single-layer structure according to the present invention use a dual-functional decoupling surface to reduce the coupling between high-frequency antennas and improve the port isolation.

[0022] (5) A co-frequency and cross-frequency decoupling surface and a dual-polarization dual-band base station antenna with a single-layer structure according to the present invention achieve radiation pattern repair and co-frequency port isolation improvement without increasing the profile and dielectric layer. The cross-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 the 5G MIMO base station antenna array. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic exploded view of the present invention;

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

[0025] Figure 3 is a schematic diagram of the metal structures etched on the upper and lower surfaces of the first dielectric plate; wherein, Figure 3 the left side in is a schematic diagram of the metal structure etched on the upper surface of the first dielectric plate, Figure 3 the right side in is a schematic diagram of the metal structure etched on the lower surface of the first dielectric plate;

[0026] Figure 4 is a schematic diagram of the metal structures etched on the upper and lower surfaces of the second dielectric plate; wherein, Figure 4 the left side in is a schematic diagram of the metal structure etched on the upper surface of the second dielectric plate, Figure 4 the right side in is a schematic diagram of the metal structure etched on the lower surface of the second dielectric plate;

[0027] Figure 5 is a schematic diagram of the metal structures etched on the upper and lower surfaces of the third dielectric plate; wherein, Figure 5 the left side in is a schematic diagram of the metal structure etched on the upper surface of the third dielectric plate, Figure 5 the right side in is a schematic diagram of the metal structure etched on the lower surface of the third dielectric plate;

[0028] Figure 6 is a schematic diagram of the metal structures etched on the upper and lower surfaces of the fourth dielectric plate; wherein, Figure 6 the left side in is a schematic diagram of the metal structure etched on the upper surface of the fourth dielectric plate, Figure 6 the right side in is a schematic diagram of the metal structure etched on the lower surface of the fourth dielectric plate;

[0029] Figure 7 Simulation and test result diagrams of S-parameters and gain of the low-frequency antenna varying with frequency;

[0030] Figure 8 Simulation and test result diagrams of S-parameters and gain of the high-frequency antenna varying with frequency;

[0031] Figure 9 Simulation and test result diagrams of the port isolation of the low-frequency antenna and the high-frequency antenna varying with frequency in the low-frequency band;

[0032] Figure 10 Simulation and test result diagrams of the port isolation of the low-frequency antenna and the high-frequency antenna varying with frequency in the high-frequency band;

[0033] Figure 11 Simulation and test result diagrams of the co-polarization isolation of the high-frequency antenna port varying with frequency;

[0034] Figure 12 Simulation and test result diagrams of the cross-polarization isolation of the high-frequency antenna port varying with frequency;

[0035] Figure 13 For the low-frequency antenna at port L 1 Simulation and test result diagrams of the E-plane and H-plane radiation patterns at the 2.2 GHz frequency point during feeding;

[0036] Figure 14 For the high-frequency antenna at port H 3 Simulation and test result diagrams of the E-plane and H-plane radiation patterns at the 4.6 GHz frequency point during feeding;

[0037] Figure 15 For the high-frequency antenna at port H 11 Simulation and test result diagrams of the E-plane and H-plane radiation patterns at the 4.6 GHz frequency point during feeding;

[0038] Figure 16 For the high-frequency antenna at port H 15 Simulation and test result diagrams of the E-plane and H-plane radiation patterns at the 4.6 GHz frequency point during feeding. Detailed implementation manners

[0039] In order to make the technical problems, technical solutions and beneficial effects to be solved by 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] As Figures 1 - 6 shown, the embodiment of the present invention includes a dual-functional decoupling surface, a low-frequency antenna assembly, a high-frequency antenna assembly, a feeding assembly and a support assembly. Among them, port L 1 and L 2 are the feeding ports of the low-frequency antenna, and port H3 ~H 20 is the feeding port of 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 plate 1, a low-frequency antenna Y-shaped feeding structure 5, and a low-frequency antenna radiator 9. Specifically, the dual-functional decoupling surface and the low-frequency antenna Y-shaped feeding structure 5 are printed on the upper surface of the first dielectric plate 1. To avoid crossovers, jumpers are used for the low-frequency antenna Y-shaped feeding structure. The low-frequency antenna radiator 9 is printed on the lower surface of the first dielectric plate 1, and the low-frequency antenna radiator 9 is a loop dipole antenna;

[0042] The dual-functional 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, the radiation wave in the high-frequency band can pass through normally, repairing the distortion of the high-frequency antenna pattern. The Jerusalem cross structures and H-shaped structures on the periphery introduce additional coupling paths, improving the port isolation of the high-frequency antenna;

[0043] The high-frequency antenna assembly includes 9 second dielectric plates 2, a high-frequency antenna Γ-shaped feeding structure 11, and a high-frequency antenna radiator 12 of the patch antenna; specifically, 4 high-frequency antenna Γ-shaped feeding structures 11 are printed on the upper surface of each second dielectric plate 2, and the high-frequency antenna radiator 12 is printed on the lower surface of the second dielectric plate 2; specifically, the high-frequency antenna radiator of the present invention is 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 components, including a third dielectric plate 3 and 4 copper posts 21 installed on the third dielectric plate 3. A metal layer 15 is printed on the upper surface of the third dielectric plate 3;

[0045] The feeding assembly includes a low-frequency feeding coaxial cable 25, a high-frequency feeding coaxial cable 26, and 9 fourth dielectric plates 4; a metal ground 22 is printed on the upper surface of each fourth dielectric plate 4, and a non-metallized via 23 for installing the high-frequency feeding coaxial cable is provided on the metal ground 22; 2 one-to-two differential feeding power dividers 24 are printed on the lower surface of the fourth dielectric plate 4;

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

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

[0048] Four non-metallized vias 10 for installing and supporting nylon posts are provided on the periphery of the first dielectric plate 1; four non-metallized vias 13 for installing and supporting nylon posts are provided on the periphery of the second dielectric plate 2; one non-metallized via 14 for installing the low-frequency antenna Y-shaped feeding structure is provided at the center of the second dielectric plate 2; four non-metallized vias 16 for installing the supporting nylon posts of the first dielectric plate are provided on the third dielectric plate 3; thirty-six non-metallized vias 17 for installing the supporting nylon posts of the second dielectric plate are provided on the third dielectric plate 3; two non-metallized vias 18 for the low-frequency antenna feeding coaxial cable to pass through are provided on the third dielectric plate 3; thirty-six non-metallized vias 19 for the high-frequency antenna feeding coaxial cable to pass through are provided on the third dielectric plate 3; four non-metallized vias 20 for installing copper posts are provided on the third dielectric plate 3.

[0049] As Figure 7 shown, it is the simulation and test result diagram of the S-parameters and gain of the low-frequency antenna in the embodiment of the present invention changing with frequency. The working frequency band of the low-frequency antenna is 1.7~2.3 GHz. The return loss in the working bandwidth of simulation and test is lower than -10 dB, the measured port isolation is lower than -25 dB, and the measured average gain is 7.8 dBi;

[0050] As Figure 8 shown, it is the simulation and test result diagram of the S-parameters and gain of the high-frequency antenna in the embodiment of the present invention changing with frequency. The working frequency band of the high-frequency antenna is 4.4~5 GHz. The return loss in the working bandwidth of simulation and test is lower than -10 dB, the measured port isolation is lower than -25 dB, port H 3 、port H 11 and port H 15 The measured average gains are 5.1 dBi, 5.8 dBi and 6.2 dBi respectively;

[0051] As Figure 9 shown, it is the 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 changing with frequency in the low-frequency band. The measured port isolation values are all lower than -25.5 dB;

[0052] As Figure 10As shown, it is a graph of the simulation and test results of the port isolation of the low-frequency antenna and the high-frequency antenna in the high-frequency band varying with frequency in the embodiments of the present invention. The measured port isolation values are all lower than -21.9 dB;

[0053] As Figure 11 shown, it is a graph of the simulation and test results of the co-polarization isolation of the high-frequency antenna port varying with frequency in the embodiments of the present invention. The measured port isolation values are all lower than -21.8 dB;

[0054] As Figure 12 shown, it is a graph of the simulation and test results of the cross-polarization isolation of the high-frequency antenna port varying with frequency in the embodiments of the present invention. The measured port isolation values are all lower than -20.2 dB;

[0055] As Figure 13 shown, it is a graph of the simulation and test results of the E-plane and H-plane patterns of the low-frequency antenna at 2.2 GHz in the embodiments of the present invention. The low-frequency antenna pattern shows a directional radiation pattern, and the simulated and measured cross-polarization is less than -19 dB;

[0056] As Figure 14 shown, it is a graph of the simulation and test results of the E-plane and H-plane patterns of the high-frequency antenna at the 4.6 GHz frequency point when fed at port H 3 in the embodiments of the present invention. The low-frequency antenna pattern shows a directional radiation pattern, and the simulated and measured cross-polarization is less than -15.3 dB;

[0057] As Figure 15 shown, it is a graph of the simulation and test results of the E-plane and H-plane patterns of the high-frequency antenna at the 4.6 GHz frequency point when fed at port H 11 in the embodiments of the present invention. The low-frequency antenna pattern shows a directional radiation pattern, and the simulated and measured cross-polarization is less than -12.6 dB;

[0058] As Figure 16 shown, it is a graph of the simulation and test results of the E-plane and H-plane patterns of the high-frequency antenna at the 4.6 GHz frequency point when fed at port H 15 in the embodiments of the present invention. The low-frequency antenna pattern shows a directional radiation pattern, and the simulated and measured cross-polarization is less than -12.9 dB;

[0059] Experiments show that a co-frequency and cross-frequency decoupling surface with a single-layer structure and a dual-polarization dual-band base station antenna involved in the present invention utilize a high-frequency antenna array to change the phase of the low-frequency reflected wave, reducing the profile height of the low-frequency antenna; the antenna profile height of the present invention is the profile height of the low-frequency antenna, and the profile height is relatively low; the antenna of the present invention uses a dual-functional decoupling surface to repair the shielding effect of the low-frequency antenna on the high-frequency antenna, realizing the conformal pattern of the high-frequency antenna; the antenna of the present invention uses a dual-functional decoupling surface to reduce the coupling between high-frequency antenna elements and improve the port isolation; the cross-frequency port isolation of the antenna of the present invention is greater than 21.9 dB, and the co-frequency port isolation is greater than 20.2 dB, achieving a good decoupling effect and can be applied to the 5G MIMO base station antenna array.

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

Claims

1. A single-layer structured same-frequency and different-frequency decoupling surface and a dual-polarization dual-band base station antenna, characterized in that: It includes a dual-function decoupling surface, a low-frequency antenna component, a high-frequency antenna component, a feeding component and a supporting component; the dual-function decoupling surface is printed on the upper surface of the first dielectric plate in the low-frequency antenna component, including a plurality of cross-shaped structural units in the central area, a plurality of Jerusalem cross structures in the peripheral area and a plurality of H-shaped structures in the outermost layer; the central cross-shaped structural unit is combined with the low-frequency antenna component to allow the high-frequency band radiation wave to pass normally and repair the distortion of the high-frequency antenna pattern; the Jerusalem cross structure and the H-shaped structure in the periphery introduce additional coupling paths to improve the isolation of the high-frequency antenna port; the low-frequency antenna component is located above the high-frequency antenna component, and the low-frequency antenna component uses the high-frequency antenna component to change the phase of the low-frequency reflected wave to reduce its own cross-sectional height; the feeding component includes a low-frequency feeding coaxial line and a high-frequency feeding coaxial line, which provide feeding for the low-frequency antenna component and the high-frequency antenna component 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 structured same-frequency and different-frequency decoupling surface and dual-polarization dual-band base station antenna according to claim 1, characterized in that: The dual-function decoupling surface printed on the low-frequency antenna component includes 24 cross-shaped structural units in the central area, 8 Jerusalem cross structures in the peripheral area and 12 H-shaped structures in the outermost layer.

3. The single-layer structured same-frequency and different-frequency decoupling surface and dual-polarization dual-band base station antenna according to claim 1, characterized in that: The low-frequency antenna assembly comprises a low-frequency antenna radiator and a low-frequency antenna Y-shaped feeding structure. The low-frequency antenna radiator is printed on the lower surface of the first dielectric plate, and the low-frequency antenna Y-shaped feeding structure is printed on the upper surface of the first dielectric plate.

4. The single-layer structured same-frequency and different-frequency decoupling surface and dual-polarization dual-band base station antenna according to 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 feeding structure in the low-frequency antenna assembly; the lower outer conductor and inner conductor 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 metal layer of the third dielectric plate in the supporting assembly.

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

6. The single-layer structured same-frequency and different-frequency decoupling surface and dual-polarization dual-band base station antenna according to claim 1, characterized in that: The high-frequency antenna assembly includes a plurality of high-frequency antenna radiators arranged in an array and a corresponding high-frequency antenna G-shaped feeding structure. Each high-frequency antenna radiator is printed on the lower surface of a second dielectric plate, and the corresponding high-frequency antenna G-shaped feeding structure is printed on the upper surface of the second dielectric plate.

7. The single-layer structured same-frequency and different-frequency decoupling surface and dual-polarization dual-band base station antenna according to claim 1, characterized in that: The support assembly comprises a third dielectric plate and a copper column. The upper surface of the third dielectric plate is provided with a metal layer and has a plurality of via holes. The copper column is mounted on the third dielectric plate.

8. The single-layer structured same-frequency and different-frequency decoupling surface and dual-polarization dual-band base station antenna according to claim 1, characterized in that: The feeding assembly further comprises a fourth dielectric plate, the upper surface of the fourth dielectric plate is printed with a metal ground, and the lower surface of the fourth dielectric plate is printed with a one-to-two differential feeding power divider.

9. The single-layer structured same-frequency and different-frequency decoupling surface and dual-polarization dual-band base station antenna according to claim 1, characterized in that: The antenna has an isolation degree of greater than 21.9 dB for different frequency ports and greater than 20.2 dB for the same frequency ports.

10. Application of a single-layer structured same-frequency and different-frequency decoupling surface and a dual-polarization dual-band base station antenna as claimed in any one of claims 1 to 9, characterized in that: Applied to 5G MIMO base station antenna arrays.

Images