Compact 5G terminal MIMO antenna based on shared radiator technology

Abstract

The invention provides a compact 5G terminal M IMO antenna based on a shared radiator technology, relates to the technical field of microwave and millimeter wave communication, and solves the technical problems that in the prior art, although an MIMO antenna realizes effective space saving, the MIMO antenna still has limitation, for example, the MIMO antenna is limited to two units, low in isolation degree, high in height and not suitable for a mobile terminal. According to the technical scheme, the antenna is composed of four patches with I grooves, and each patch is connected to a feed port; for a single patch, the slot controls and combines a TM10 mode and a TM01 mode to realize dual-mode operation; then, coupling between the patches is utilized by using a shared radiator technology; according to the invention, the broadband is realized, the 5G N79 frequency band is comprehensively covered, and the highly compact size is maintained.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of microwave communication, in particular to a compact 5G terminal MIMO antenna based on shared radiator technology. BACKGROUND

[0002] The commercialization of the fifth generation (5G) network highlights the urgent need for wider spectrum allocation and the improvement of mobile device data processing capabilities. Improving the channel capacity of wireless systems has become a key goal, which can be effectively achieved by deploying a large number of antennas. Therefore, the multiple-input multiple-output (MIMO) technology has attracted widespread attention because it uses spatial multiplexing to improve system capacity without increasing additional bandwidth or transmit power.

[0003] In mobile terminals, MIMO antennas can be installed on the side frame or the back cover of the body. There are many MIMO designs for side frame installation at present. However, with a significant increase in the number of antennas, the available space on the frame becomes increasingly limited. Therefore, the back cover of the body becomes a promising location for MIMO deployment, which has recently attracted increasing research interest. However, most units still exist independently, and due to the small unit spacing, the isolation between units is relatively low, which still has the potential to further reduce the size. The MIMO configuration of the shared radiator more effectively improves the space utilization. Although these designs achieve effective space saving, they still have limitations, such as being limited to two units, low isolation, and high height not suitable for mobile terminals.

[0004] It is still a major challenge to achieve low profile and wideband MIMO at a compact size. Therefore, it will have good research significance and application value to design a compact 5G terminal MIMO antenna system based on shared radiator technology. SUMMARY

[0005] Therefore, the compact 5G terminal MIMO antenna based on shared radiator technology solves the above problems; the compact 5G terminal MIMO antenna based on shared radiator technology provided by the present application is designed for integration into a mobile terminal supporting 5G. The MIMO system is composed of four patches with I-shaped slots, and each patch is connected to a feed port. For a single patch, the slot controls and combines the TM10 mode and the TM01 mode to achieve dual-mode operation. Subsequently, the shared radiator technology is used to utilize the coupling between the patches. When one patch is activated, it will cause the adjacent patch to be excited as well, resulting in a multi-patch operation mode, which improves the impedance matching. In order to ensure the isolation, metal vias are used to control the coupling between the units, achieving an isolation of more than 15 dB.

[0006] The application provides a compact 5G terminal MIMO antenna based on a shared radiator technology, which comprises an antenna substrate, a metal ground arranged below the antenna substrate, a metal patch arranged on the upper surface of the antenna substrate for radiation, and a probe structure arranged on the lower surface of the metal ground.

[0007] Further, the four groups of metal patches are arranged in a 2x2 matrix, and adjacent metal patches are sequentially rotated by 90 degrees along the center of the antenna substrate.

[0008] Further, a second metalized via hole is arranged in the region corresponding to each group of metal patches on the antenna substrate, and each group of the second metalized via hole passes through the corresponding metal patch.

[0009] Further, the lower surface of the metal ground is provided with four groups of probe structures.

[0010] Compared with the prior art, the application has the following advantages:

[0011] 1. The compact 5G terminal MIMO antenna based on the shared radiator technology uses the shared radiator technology and utilizes the coupling between the metal patches.

[0012] 2. The compact 5G terminal MIMO antenna based on the shared radiator technology adopts the feed point offset feed structure, realizes the multi-mode working mode, enhances the bandwidth, is composed of only one substrate, has no air layer, has high integration, simple structure and low cost. BRIEF DESCRIPTION OF DRAWINGS

[0013] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0015] Figure 2 This is a top view of the present invention;

[0016] Figure 3 The figure shows the simulation results of the impedance bandwidth and isolation of the microwave band antenna of the present invention.

[0017] Figure 4 The simulation results are shown for (a) the envelope coefficient and (b) the efficiency of the microwave band antenna of the present invention.

[0018] Figure 5 The simulation radiation pattern of the microwave unit of the present invention is shown; Unit 1 (a) 4.5 GHz in the xoz plane, (b) yoz plane; (c) 4.9 GHz in the xoz plane, (d) yoz plane.

[0019] Explanation of reference numerals in the attached figures:

[0020] 1. Metal patch; 2. Antenna substrate; 3. First metallized via; 4. Second metallized via; 5. Gap; 6. Metal ground; 7. Probe structure. Detailed Implementation

[0021] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] In the description of this invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0023] Example 1

[0024] Figure 1This is a schematic diagram of the overall structure of a compact 5G terminal MIMO antenna based on shared radiator technology provided in this embodiment. It includes: an antenna substrate 2, a metal ground plane 6 below the antenna substrate 2, metal patches 1 for radiation on the upper surface of the antenna substrate 2, and probe structures 7 on the lower surface of the metal ground plane 6. Four groups of metal patches 1 are provided, each group having an I-shaped slot 5. The I-shaped slot 5 is used to control the TM01 mode. The four groups of metal patches 1 are arranged in a 2x2 matrix, with adjacent metal patches 1 rotated 90 degrees sequentially along the center of the antenna substrate 2. A gap is left between adjacent metal patches 1, and a first metallized via 3 is provided in the area of ​​the antenna substrate 2 within this gap. The first metallized via 3 is used to adjust the isolation between antenna elements. A second metallized via 4 is provided on the antenna substrate 2 corresponding to each group of metal patches 1, and each group of second metallized via 4 passes through the corresponding metal patch 1. The second metallized via 4 is used to adjust the antenna element feed. Four sets of probe structures 7 are provided on the lower surface of the metal ground plane 6. The four sets of probe structures 7 correspond to the four sets of metal patches 1, respectively. The probe structures 7 are used to feed the four patches of the antenna. This not only achieves wide bandwidth, fully covering the 5G N79 band, but also maintains a highly compact size, making it ideal for modern 5G mobile terminal applications.

[0025] This application is specifically designed for integration into 5G-enabled mobile terminals. The MIMO system consists of four metal patches 1 with I-type slots, each connected to a feed port. For a single metal patch 1, slot 5 controls and merges TM10 and TM01 modes to achieve dual-mode operation. Subsequently, a shared radiator technique is used to leverage the coupling between the patches. When one patch is activated, it also activates adjacent patches, resulting in a multi-patch operation mode and improved impedance matching. To ensure isolation, metal vias are used to control the coupling between the control units, achieving isolation exceeding 15 dB. Shared radiating structure: By activating a metal patch, surrounding patches are driven to radiate in tandem, forming a "shared radiator" MIMO system; Dual-mode excitation method: A slotted structure is used to achieve dual-mode synthesis of TM10 and TM01, improving bandwidth; Isolation enhancement technology: Metallized vias are introduced to precisely adjust the coupling between adjacent antennas; Low profile compact structure: A single-layer FR4 substrate enables a 4-antenna configuration, facilitating deployment on mobile terminal chassis; Overall coverage of the N79 frequency band: Bandwidth of 4.34–5.06 GHz, meeting the requirements of 5G communication.

[0026] Example 2

[0027] In this embodiment, the antenna substrate 2 has a dielectric constant of 4.4, a loss angle of 0.02, and a thickness of 1.5 mm. The overall cross-sectional height is 1.5 mm (~0.023λ0@4.7GHz). The antenna's impedance bandwidth and inter-element isolation are as follows... Figure 3As shown, for S11 ≤ -10dB, the bandwidth range is 4.34–5.06GHz, demonstrating excellent coverage of the Sub-6 GHz band (4.4–5GHz). The isolation between antenna ports is greater than 15dB in the microwave band. The overall efficiency and envelope coefficient of the microwave antenna are as follows... Figure 4 As shown, the overall efficiency of each antenna element is higher than 40%, and the envelope coefficient ECC is lower than 0.3, indicating good performance. Figure 5 The radiation patterns of microwave element 1 at 4.5 GHz and 4.9 GHz in the xoz and yoz planes are shown. Based on the symmetry of the antenna elements, it can be seen that these complementary radiation modes indicate strong diversity performance, confirming the comprehensive spatial coverage capability of the MIMO system.

[0028] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A compact 5G terminal MIMO antenna based on shared radiator technology, characterized in that, include: Antenna substrate (2), a metal ground (6) is provided below the antenna substrate (2), a metal patch (1) for radiation is provided on the upper surface of the antenna substrate (2), and a probe structure (7) is provided on the lower surface of the metal ground (6).

2. The compact 5G terminal MIMO antenna based on shared radiator technology according to claim 1, characterized in that, The metal patch (1) is provided in four groups, and each group of metal patches (1) has an I-shaped slit (5).

3. The compact 5G terminal MIMO antenna based on shared radiator technology according to claim 2, characterized in that, The four groups of metal patches (1) are arranged in a 2x2 matrix, and adjacent metal patches (1) are rotated 90 degrees sequentially along the center of the antenna substrate (2).

4. The compact 5G terminal MIMO antenna based on shared radiator technology according to claim 3, characterized in that, A gap is left between adjacent metal patches (1), and a first metallized through hole (3) is provided in the area of ​​the antenna substrate (2) in the gap.

5. The compact 5G terminal MIMO antenna based on shared radiator technology according to claim 4, characterized in that, The antenna substrate (2) has a second metallized through hole (4) in the area corresponding to each group of metal patches (1), and each group of second metallized through holes (4) passes through the corresponding metal patch (1).

6. The compact 5G terminal MIMO antenna based on shared radiator technology according to claim 5, characterized in that, Four sets of probe structures (7) are provided on the lower surface of the metal ground (6).

7. The compact 5G terminal MIMO antenna based on shared radiator technology according to claim 6, characterized in that, The four sets of probe structures (7) correspond to the four sets of metal patches (1) respectively.

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