A compact broadband 5G MIMO array antenna

Abstract

The present invention relates to a compact broadband 5G MIMO array antenna, comprising a planar dielectric substrate, wherein a first feed unit and a second feed unit are printed on the upper surface of the planar dielectric substrate; a metal floor is printed on the lower surface of the planar dielectric substrate; a side dielectric substrate is arranged upward along the two long edges of the planar dielectric substrate, and the plate surface of the side dielectric substrate is perpendicular to the plate surface of the planar dielectric substrate; and a first radiation unit, a second radiation unit, a third radiation unit, a fourth radiation unit, a fifth radiation unit, a sixth radiation unit, and a radiation decoupling unit are printed on the inner surface of the side dielectric substrate. The present invention achieves decoupling of the dual antenna module by symmetrically placing the first radiation unit and the second radiation unit side by side and inserting the radiation decoupling unit, thereby participating in the radiation of the antenna; the operating frequency band is 4.4 to 6 GHz, and the isolation is 14 dB; the antenna has the characteristics of small size, compactness, broadband, and multiple antennas, and can be used in 5G mobile terminal MIMO communication applications such as 5G smartphones.

Description

Technical Field

[0001] The present invention relates to the technical field of MIMO array antennas, and in particular to a compact broadband 5G MIMO array antenna. Background Art

[0002] China's Ministry of Industry and Information Technology has designated 3.4 to 3.6 GHz (LTE band 42) and 4.8 to 5 GHz as the operating frequency bands for 5G communications. Furthermore, different countries and operators use different frequency bands for 5G communications. For example, Japan has authorized the 3.6 to 4.2 GHz and 4.2 to 4.9 GHz 5G bands; the 5170 to 5835 MHz band is designated for 5G WLAN (wireless local area network) operation.

[0003] Massive Multiple-Input Multiple-Output (MIMO) has been proven to be a fundamental technology for fifth-generation (5G) communication systems. Once mobile terminals have a large number of antennas, 5G channel capacity can be increased. Generally speaking, to increase channel capacity in mobile devices such as mobile phones, it is often necessary to integrate four, six, or even more antenna elements into the terminal. However, with the latest trend toward full-screen smartphones, the area and clearance reserved for 5G terminals are shrinking, significantly squeezing the space and ground clearance reserved for antenna design. Therefore, integrating so many antenna elements into the limited space of a smartphone while achieving good isolation and avoiding severe coupling that could affect antenna radiation performance is a significant challenge.

[0004] Patent announcement number CN110112559A proposes a miniaturized dual-band eight-unit MIMO terminal antenna design suitable for 5G. However, the antenna bandwidth of this solution can only cover the two 5G operating frequency bands of 3.4-3.8 GHz and 4.8-5.1 GHz. The number of MIMO antenna units is 8, and the antenna units are non-integrated, which increases the overall complexity of the system and the space occupied by the antenna. Summary of the Invention

[0005] In order to improve the throughput of mobile communication systems, the purpose of the present invention is to provide a compact broadband 5G MIMO array antenna that is small in size, compact, has a wide operating frequency band, multiple antennas, and integrated multiple antennas. The antenna eliminates the coupling between compact antenna units through a T-shaped radiation decoupling unit, and can be used in 5G mobile terminal MIMO communication applications such as 5G smartphones.

[0006] To achieve the above objectives, the present invention adopts the following technical solutions: a compact broadband 5G MIMO array antenna, comprising a planar dielectric substrate and a side dielectric substrate, wherein a first feeding unit and a second feeding unit are printed on the upper surface of the planar dielectric substrate, and the lower ends of the first feeding unit and the second feeding unit are connected to an SMA feeding structure; a metal floor is printed on the lower surface of the planar dielectric substrate; the side dielectric substrate is arranged upward along the two long edges of the planar dielectric substrate, and the board surface of the side dielectric substrate is perpendicular to the board surface of the planar dielectric substrate; the inner surface of the side dielectric substrate is printed with a first radiating unit, a second radiating unit, a third radiating unit, a fourth radiating unit, a fifth radiating unit, a sixth radiating unit and a radiation decoupling unit; the first feeding unit, the SMA feeding structure, the first radiating unit, the second radiating unit and the third radiating unit constitute a first antenna unit; the second feeding unit, the SMA feeding structure, the fourth radiating unit, the fifth radiating unit and the sixth radiating unit constitute a second antenna unit; the first antenna unit and the second antenna unit are symmetrically arranged on both sides of the radiation decoupling unit, the first antenna unit, the second antenna unit and the radiation decoupling unit constitute a dual antenna module, and multiple dual antenna modules are symmetrically arranged on the side dielectric substrate.

[0007] The first feeding unit and the second feeding unit are both rectangular and symmetrically arranged; the upper end of the first feeding unit is connected to the lower end of the first radiating unit, the upper end of the second feeding unit is connected to the lower end of the fourth radiating unit, and the SMA feeding structure passes through the planar dielectric substrate and the metal floor.

[0008] The first radiation unit and the fourth radiation unit are arranged symmetrically, the second radiation unit and the fifth radiation unit are arranged symmetrically, and the third radiation unit and the sixth radiation unit are arranged symmetrically; the first radiation unit, the second radiation unit, and the third radiation unit are all L-shaped, and the radiation decoupling unit is T-shaped. The first radiation unit is located below the radiation decoupling unit and to the right of the third radiation unit; the lower end of the second radiation unit is connected to the metal floor, the second radiation unit is located to the lower right of the first radiation unit and is smaller than the first radiation unit; the third radiation unit is located to the lower left of the radiation decoupling unit, the lower end of the third radiation unit is connected to the metal floor, and the right end of the third radiation unit is connected to the first radiation unit; the fourth radiation unit, the fifth radiation unit, and the sixth radiation unit are all L-shaped, the fourth radiation unit is located below the radiation decoupling unit and to the left of the sixth radiation unit; the lower end of the fifth radiation unit is connected to the metal floor, the fifth radiation unit is located to the lower left of the fourth radiation unit and is smaller than the fourth radiation unit; the sixth radiation unit is located to the lower right of the fourth radiation unit, the lower end of the sixth radiation unit is connected to the metal floor, and the left end of the sixth radiation unit is connected to the fourth radiation unit.

[0009] The left and right ends of the radiation decoupling unit are respectively located above the first radiation unit and the fourth radiation unit.

[0010] The horizontal length of the first radiation unit is greater than that of the second radiation unit, the horizontal length of the third radiation unit is less than that of the second radiation unit, the vertical height of the first radiation unit is greater than that of the third radiation unit, and the vertical height of the third radiation unit is greater than that of the second radiation unit; the patch width of the first radiation unit is greater than the patch widths of the second radiation unit and the third radiation unit; the fourth radiation unit has the same shape as the first radiation unit, the fifth radiation unit has the same shape as the second radiation unit, and the sixth radiation unit has the same shape as the third radiation unit.

[0011] Four dual-antenna modules are arranged on one side of the side dielectric substrate, and four dual-antenna modules are symmetrically arranged on the other side of the side dielectric substrate. A decoupling unit is set between two adjacent dual-antenna modules. The decoupling unit is rectangular in shape. The decoupling unit is located above the third radiating unit and the sixth radiating unit of the two adjacent dual-antenna modules. The two ends of the decoupling unit are respectively connected to the first radiating unit and the fourth radiating unit of the two adjacent dual-antenna modules.

[0012] It can be seen from the above technical solution that the beneficial effects of the present invention are: First, the present invention not only realizes the decoupling of the dual antenna module but also participates in the radiation of the antenna by placing the first radiation unit and the second radiation unit side by side symmetrically and inserting the first radiation decoupling structure; Second, the working frequency band of the present invention is 4.4 to 6 GHz, and the isolation is 14 dB; Third, the present invention has the characteristics of small size, compactness, broadband, multiple antennas, etc., and can be used in 5G mobile terminal MIMO communication applications such as 5G smartphones. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 Schematic diagram of the structure of the dual antenna module in the present invention;

[0014] Figure 2 This is a schematic structural diagram of Example 1 of the present invention;

[0015] Figure 3 This is a structural schematic diagram of the first feeding unit, the second feeding unit, the SMA feeding structure, the planar dielectric substrate, and the side dielectric substrate in Example 1 of the present invention;

[0016] Figure 4 Schematic diagram of the metal floor and SMA feeding structure of Example 1 of the present invention;

[0017] Figure 5 This is a schematic structural diagram of two dual-antenna modules in Example 1 of the present invention;

[0018] Figure 6 is a reflection coefficient curve diagram of the dual-antenna module according to the first embodiment of the present invention;

[0019] Figure 7 is a transmission coefficient curve diagram of the dual-antenna module according to the first embodiment of the present invention;

[0020] Figure 8 is a radiation efficiency curve diagram of the dual-antenna module according to the first embodiment of the present invention;

[0021] Figure 9 is a graph showing envelope correlation coefficients between adjacent dual-antenna module ports in Example 1 of the present invention;

[0022] Figure 10 This is a schematic structural diagram of Example 2 of the present invention;

[0023] Figure 11 This is a structural schematic diagram of the first feeding unit, the second feeding unit, the SMA feeding structure, the planar dielectric substrate, and the side dielectric substrate in Example 2 of the present invention;

[0024] Figure 12 Schematic diagram of the metal floor and SMA feeding structure of Example 2 of the present invention;

[0025] Figure 13 Schematic diagram of the structure of four dual-antenna modules in Example 2 of the present invention;

[0026] Figure 14 This is a schematic structural diagram of two dual-antenna modules in Example 2 of the present invention;

[0027] Figure 15 is a reflection coefficient curve diagram of two dual-antenna modules in Example 2 of the present invention;

[0028] Figure 16 is a transmission coefficient curve diagram between dual antenna modules in Example 2 of the present invention;

[0029] Figure 17 This is a radiation efficiency curve diagram of two dual-antenna modules in Example 2 of the present invention;

[0030] Figure 18 FIG. 4 is a graph showing the envelope correlation coefficient between the dual antenna modules in the second embodiment of the present invention. DETAILED DESCRIPTION

[0031] like Figure 1As shown, a compact broadband 5G MIMO array antenna includes a planar dielectric substrate 11 and a side dielectric substrate 12. The upper surface of the planar dielectric substrate 11 is printed with a first feed unit 2 and a second feed unit 6. The lower ends of the first feed unit 2 and the second feed unit 6 are connected to the SMA feeding structure 1; the lower surface of the planar dielectric substrate 11 is printed with a metal floor 13; the side dielectric substrate 12 is arranged upward along the two long edges of the planar dielectric substrate 11, and the board surface of the side dielectric substrate 12 is perpendicular to the board surface of the planar dielectric substrate 11. The inner surface of the side dielectric substrate 12 is printed with a first radiation unit 3, a second radiation unit 4, a third radiation unit 5, and a fourth radiation unit 7, the fifth radiation unit 8, the sixth radiation unit 9 and the radiation decoupling unit 10; the first feeding unit 2, the SMA feeding structure 1, the first radiation unit 3, the second radiation unit 4 and the third radiation unit 5 constitute the first antenna unit; the second feeding unit 6, the SMA feeding structure 1, the fourth radiation unit 7, the fifth radiation unit 8 and the sixth radiation unit 9 constitute the second antenna unit; the first antenna unit and the second antenna unit are symmetrically arranged on both sides of the radiation decoupling unit 10, the first antenna unit, the second antenna unit and the radiation decoupling unit 10 constitute a dual antenna module, and multiple dual antenna modules are symmetrically arranged on the left and right sides of the side dielectric substrate 12.

[0032] The first feeding unit 2 and the second feeding unit 6 are both rectangular and symmetrically arranged; the upper end of the first feeding unit 2 is connected to the lower end of the first radiating unit 3, and the upper end of the second feeding unit 6 is connected to the lower end of the fourth radiating unit 7. The SMA feeding structure 1 passes through the planar dielectric substrate 11 and the metal floor 13.

[0033] The first radiation unit 3 and the fourth radiation unit 7 are symmetrically arranged, the second radiation unit 4 and the fifth radiation unit 8 are symmetrically arranged, and the third radiation unit 5 and the sixth radiation unit 9 are symmetrically arranged; the first radiation unit 3, the second radiation unit 4, and the third radiation unit 5 are all L-shaped, and the radiation decoupling unit 10 is T-shaped. The first radiation unit 3 is located below the radiation decoupling unit 10 and to the right of the third radiation unit 5; the lower end of the second radiation unit 4 is connected to the metal floor 13, and the second radiation unit 4 is located to the lower right of the first radiation unit 3 and is smaller than the first radiation unit 3; the third radiation unit 5 is located to the lower left of the radiation decoupling unit 10. The lower end of the third radiation unit 5 is connected to the metal floor 13, and the right end of the third radiation unit 5 is connected to the first radiation unit 3; the fourth radiation unit 7, the fifth radiation unit 8, and the sixth radiation unit 9 are all L-shaped, and the fourth radiation unit 7 is located below the radiation decoupling unit 10 and on the left side of the sixth radiation unit 9; the lower end of the fifth radiation unit 8 is connected to the metal floor 13, and the fifth radiation unit 8 is located at the lower left of the fourth radiation unit 7 and is smaller than the fourth radiation unit 7; the sixth radiation unit 9 is located at the lower right of the fourth radiation unit 7, the lower end of the sixth radiation unit 9 is connected to the metal floor 13, and the left end of the sixth radiation unit 9 is connected to the fourth radiation unit 7.

[0034] The left and right ends of the radiation decoupling unit 10 are respectively located above the first radiation unit 3 and the fourth radiation unit 7 .

[0035] The horizontal length of the first radiation unit 3 is greater than the horizontal length of the second radiation unit 4, the horizontal length of the third radiation unit 5 is smaller than the horizontal length of the second radiation unit 4, the vertical height of the first radiation unit 3 is greater than the vertical height of the third radiation unit 5, and the vertical height of the third radiation unit 5 is greater than the vertical height of the second radiation unit 4; the patch width of the first radiation unit 3 is greater than the patch widths of the second radiation unit 4 and the third radiation unit 5; the fourth radiation unit 7 has the same shape as the first radiation unit 3, the shape of the fifth radiation unit 8 is the same as the shape of the second radiation unit 4, and the shape of the sixth radiation unit 9 is the same as the shape of the third radiation unit 5.

[0036] Four dual antenna modules are arranged on one side of the side dielectric substrate 12, and four dual antenna modules are symmetrically arranged on the other side of the side dielectric substrate 12. A decoupling unit 14 is set between two adjacent dual antenna modules. The decoupling unit 14 is rectangular in shape. The decoupling unit 14 is located above the third radiation unit 5 and the sixth radiation unit 9 of the two adjacent dual antenna modules. The two ends of the decoupling unit 14 are respectively connected to the first radiation unit 3 and the fourth radiation unit 7 of the two adjacent dual antenna modules.

[0037] Example 1

[0038] like Figure 2 、 3 As shown in Figures 4 and 5, the first embodiment is an 8-unit broadband 5G MIMO array antenna. The 8-unit MIMO antenna array system is applied to mobile terminal devices and includes 4 dual-antenna modules. It can cover the 4.4-6 GHz frequency band including the 5G communication operating frequency bands of n79 and 5G WLAN. The first antenna unit and the second antenna unit in the dual antenna module of the 2*N (N=4) unit MIMO array have an isolation of more than 14 dB. A T-shaped radiation decoupling unit 10 is used. The radiation decoupling unit 10 can not only be used to reduce the coupling between the antenna units in the dual antenna module, but also participate in the radiation of the antenna units. By symmetrically placing N (N=4) dual antenna modules in four areas of the mobile terminal, 5G 8 8 MIMO systems will greatly improve space utilization within mobile terminals. Table 1 below provides the performance parameters of the designed wideband 2*N (N=4) unit 5G MIMO array antenna for your understanding.

[0039] Table 1

[0040] parameter The 2*N (N=4) unit MIMO array antenna proposed by the present invention Operating frequency band of 2*N (N=4) element MIMO array antenna 4.4-6 GHz Isolation of 2*N (N=4) element MIMO array antenna 14dB Number of antennas in a MIMO array antenna 8 Radiation efficiency More than 52% Envelope correlation coefficient between ports Less than 0.13

[0041] As shown in Table 2 below, combined with the above description of the broadband 2*N (N=4) unit MIMO array antenna, the following is obtained: Figures 6 to 9 Conditions for simulation performance shown.

[0042] Table 2

[0043] Parameters (mm) The dual antenna module proposed by the present invention The width W1 of the first feeding unit 2 1～2 The width W2 of the second feeding unit 6 1～2 The length L1 of the first feeding unit 2 8～15 The length L2 of the second feeding unit 6 8～15 The distance L between the first feeding unit 2 and the second feeding unit 6 25～36

[0044] As shown in Table 3 below, combined with the description of the dual antenna module above, the following are obtained: Figures 6 to 9 Conditions for simulation performance shown.

[0045] Table 3

[0046] Parameters (mm) The dual antenna module proposed by the present invention The length L3 of the first radiation unit 3 10～15 The height W3 of the first radiation unit 3 6～7 The length L4 of the second radiation unit 4 5～8 The height W4 of the second radiation unit 4 1～3 The length L5 of the third radiation unit 5 3～4 The height W5 of the third radiation unit 5 3～4 The length L6 of the fourth radiation unit 7 10～15 Height W6 of the fourth radiation unit 7 6～7 The length L7 of the fifth radiation unit 8 5～8 The height W7 of the fifth radiation unit 8 1～3 The length L8 of the sixth radiation unit 9 3～4 The height W8 of the sixth radiation unit 9 3～4

[0047] As shown in Table 4 below, specific dimensions of the radiation decoupling unit 10 are given to achieve good performance.

[0048] Table 4

[0049] Parameters (mm) Radiation decoupling unit 10 Bottom length H1 of the radiation decoupling unit 10 14～20 Height D1 of the radiation decoupling unit 10 7 Top length H2 of the radiation decoupling unit 10 32～40 The top width D2 of the radiation decoupling unit 10 0.5～2

[0050] like Figure 6 and Figure 7As shown, the -6dB impedance bandwidth of both the first and second antenna units covers 4.4 to 6 GHz. The dual-antenna module achieves greater than 14 dB isolation between the first and second antenna units within the 4.4 to 6 GHz wide frequency band. Therefore, the effective bandwidth in this embodiment is 4.4 to 6 GHz, covering 5G communication frequency bands such as n79 (4.4 to 5 GHz) and 5G WLAN (5.15 to 5.925 GHz).

[0051] like Figure 8 As shown, the radiation efficiency of the first antenna unit and the second antenna unit in the effective bandwidth of 4.4 to 5.925 GHz is greater than 52%, and has very good radiation performance.

[0052] like Figure 9 As shown, due to the symmetrical deployment of N (N=4) dual-antenna modules, Figure 9 Only simulated ECC curves for two adjacent dual-antenna modules within the effective operating frequency band are presented. Simulation results show that the inter-port ECC of the first and second antenna elements is less than 0.13, and the inter-port ECC of the second and third antenna elements is less than 0.02, both below the MIMO antenna operating standard of less than 0.5. Therefore, the proposed broadband 2*N (N=4) element 5G MIMO array of dual-antenna modules exhibits excellent diversity performance. Here, the third antenna element refers to the first antenna element of a dual-antenna module adjacent to the second antenna element of the same dual-antenna module.

[0053] Example 2

[0054] like Figure 10 、 11 , 12, 13, and 14, the second embodiment is a 16-unit broadband 5G MIMO array antenna, as shown in FIG. Figure 14 As shown, the decoupling unit 14 realizes the decoupling between the antenna modules to obtain good isolation between the two dual antenna modules.

[0055] As shown in Table 5 below, the performance parameters of the 2*N (N=8) unit broadband 5G MIMO array antenna of Example 2 are given:

[0056] Table 5

[0057] parameter The present invention proposes a 2*N (N=8) unit broadband MIMO array antenna Operating frequency band of 2*N (N=8) MIMO array antenna 4.4-6 GHz Isolation of 2*N (N=8) MIMO array antenna 10.5 dB Number of antennas in a MIMO array antenna 16 Radiation efficiency More than 52% Envelope correlation coefficient between ports Less than 0.39

[0058] As shown in Table 6 below, the following table gives the Figures 15 to 18 Conditions for simulation performance shown.

[0059] Table 6

[0060] Parameters (mm) The dual antenna module proposed by the present invention Length M1 of the decoupling unit 14 6～12 Height H3 of the decoupling unit 14 4 Width H4 of the decoupling unit 14 0.1～0.9 The distance between the dual antenna modules is M2 4

[0061] like Figure 15 and Figure 16 As shown, the -6dB impedance bandwidth of the N (N=4) first antenna units and the N (N=4) second antenna units can both cover 4.4 to 6 GHz, and the isolation of the dual-antenna module within the 4.4 to 6 GHz wide frequency band is greater than 10.5 dB. Therefore, the effective bandwidth in this embodiment is 4.4 to 6 GHz, covering 5G communication frequency bands including n79 (4.4 to 5 GHz) and 5G WLAN (5.15 to 5.925 GHz).

[0062] like Figure 17 As shown, the radiation efficiency of the first antenna unit and the second antenna unit in the effective bandwidth of 4.4 to 5.925 GHz is greater than 52.5%, and has good radiation performance.

[0063] like Figure 18 As shown in the figure, simulation results show that the inter-port ECC of antenna elements is less than 0.39, which is lower than the working standard of MIMO antenna below 0.5. Therefore, the proposed compact integrated 16-element broadband 5G MIMO array antenna has good diversity performance.

[0064] In summary, the present invention proposes a 5G MIMO array dual-antenna module that combines the characteristics of small size, extreme compactness, broadband, and multiple antennas. It can cover the global 5G communication operating frequency bands such as n79 (4.4-5 GHz) in sub-6 GHz and 5G WLAN (5.15-5.925 GHz), and can be well used in antenna applications of 5G mobile terminal devices.

Claims

1. A compact broadband 5G MIMO array antenna, characterized by: The invention comprises a planar dielectric substrate (11) and a side dielectric substrate (12), wherein the upper surface of the planar dielectric substrate (11) is printed with a first feeding unit (2) and a second feeding unit (6), and the lower ends of the first feeding unit (2) and the second feeding unit (6) are connected to the SMA feeding structure (1); the lower surface of the planar dielectric substrate (11) is printed with a metal floor (13); the side dielectric substrate (12) is arranged upward along the two long edges of the planar dielectric substrate (11), and the plate surface of the side dielectric substrate (12) is perpendicular to the plate surface of the planar dielectric substrate (11); the inner surface of the side dielectric substrate (12) is printed with a first radiating unit (3), a second radiating unit (4), a third radiating unit (5), a fourth radiating unit (7), A fifth radiating unit (8), a sixth radiating unit (9) and a radiating decoupling unit (10); the first feeding unit (2), the SMA feeding structure (1), the first radiating unit (3), the second radiating unit (4) and the third radiating unit (5) constitute a first antenna unit; the second feeding unit (6), the SMA feeding structure (1), the fourth radiating unit (7), the fifth radiating unit (8) and the sixth radiating unit (9) constitute a second antenna unit; the first antenna unit and the second antenna unit are symmetrically arranged on both sides of the radiating decoupling unit (10); the first antenna unit, the second antenna unit and the radiating decoupling unit (10) constitute a dual antenna module, and a plurality of dual antenna modules are symmetrically arranged on the left and right sides of the side dielectric substrate (12); The first feeding unit (2) and the second feeding unit (6) are both rectangular, and the first feeding unit (2) and the second feeding unit (6) are symmetrically arranged; the upper end of the first feeding unit (2) is connected to the lower end of the first radiating unit (3), the upper end of the second feeding unit (6) is connected to the lower end of the fourth radiating unit (7), and the SMA feeding structure (1) passes through the planar dielectric substrate (11) and the metal floor (13); The first radiation unit (3) and the fourth radiation unit (7) are symmetrically arranged, the second radiation unit (4) and the fifth radiation unit (8) are symmetrically arranged, and the third radiation unit (5) and the sixth radiation unit (9) are symmetrically arranged; the first radiation unit (3), the second radiation unit (4), and the third radiation unit (5) are all L-shaped, and the radiation decoupling unit (10) is T-shaped. The first radiation unit (3) is located below the radiation decoupling unit (10) and to the right of the third radiation unit (5); the lower end of the second radiation unit (4) is connected to the metal floor (13), and the second radiation unit (4) is located to the lower right of the first radiation unit (3) and is smaller in size than the first radiation unit (3); the third radiation unit (5) is located to the lower left of the radiation decoupling unit (10), and the first radiation unit (3) is located to the lower right of the radiation decoupling unit (10). The lower ends of the three radiation units (5) are connected to the metal floor (13), and the right end of the third radiation unit (5) is connected to the first radiation unit (3); the fourth radiation unit (7), the fifth radiation unit (8), and the sixth radiation unit (9) are all L-shaped, and the fourth radiation unit (7) is located below the radiation decoupling unit (10) and on the left side of the sixth radiation unit (9); the lower end of the fifth radiation unit (8) is connected to the metal floor (13), and the fifth radiation unit (8) is located at the lower left of the fourth radiation unit (7) and is smaller in size than the fourth radiation unit (7); the sixth radiation unit (9) is located at the lower right of the fourth radiation unit (7), the lower end of the sixth radiation unit (9) is connected to the metal floor (13), and the left end of the sixth radiation unit (9) is connected to the fourth radiation unit (7).

2. The compact broadband 5G MIMO array antenna according to claim 1, characterized in that: The left and right ends of the radiation decoupling unit (10) are respectively located above the first radiation unit (3) and the fourth radiation unit (7).

3. The compact broadband 5G MIMO array antenna according to claim 1, wherein: The horizontal length of the first radiation unit (3) is greater than the horizontal length of the second radiation unit (4), the horizontal length of the third radiation unit (5) is less than the horizontal length of the second radiation unit (4), the vertical height of the first radiation unit (3) is greater than the vertical height of the third radiation unit (5), and the vertical height of the third radiation unit (5) is greater than the vertical height of the second radiation unit (4); the patch width of the first radiation unit (3) is greater than the patch widths of the second radiation unit (4) and the third radiation unit (5); the fourth radiation unit (7) has the same shape as the first radiation unit (3), the fifth radiation unit (8) has the same shape as the second radiation unit (4), and the sixth radiation unit (9) has the same shape as the third radiation unit (5).

4. The compact broadband 5G MIMO array antenna according to claim 1, wherein: Four dual antenna modules are arranged on one side of the side dielectric substrate (12), and four dual antenna modules are symmetrically arranged on the other side of the side dielectric substrate (12). A decoupling unit (14) is provided between two adjacent dual antenna modules. The decoupling unit (14) is rectangular in shape. The decoupling unit (14) is located above the third radiation unit (5) and the sixth radiation unit (9) of the two adjacent dual antenna modules. Two ends of the decoupling unit (14) are respectively connected to the first radiation unit (3) and the fourth radiation unit (7) of the two adjacent dual antenna modules.

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