A terminal MIMO antenna

Abstract

This invention provides a terminal MIMO antenna, characterized by comprising a rectangular dielectric substrate, a ground plane assembly, a first antenna assembly, a second antenna assembly, and a decoupling assembly; the ground plane assembly is located on the upper layer of the dielectric substrate; the antenna assembly is suspended above the ground plane assembly and connected to it; the decoupling assembly is located on the upper layer of the dielectric substrate; the antenna assembly has feed points on the short and long sides of the radiating structure, and feeds the two feed points respectively to realize a shared MIMO antenna and achieve cross-polarized radiation, improving the isolation of the shared antenna; two antenna assemblies are arranged above the dielectric substrate to realize a terminal 4MIMO antenna; the entire antenna system is small in size, occupies less space, has a lower cost, and good isolation, thus forming a multi-MIMO antenna system and achieving good antenna radiation efficiency and good radiation direction characteristics.

Description

Technical Field

[0001] This invention relates to the field of wireless communication, and in particular to the design of a terminal shared multi-MIMO antenna. Background Technology

[0002] MIMO Antenna: The definition of MIMO is very simple: any wireless communication system that uses multiple antennas for data transmission at both the receiver and transmitter can be called a MIMO wireless communication system. MIMO systems typically use distributed antennas with large spacing between antenna elements, allowing signals on the antennas to be considered independent. MIMO technology effectively utilizes random fading and multipath propagation to improve transmission rate and quality, and its advantages are fully demonstrated in environments with abundant scattering objects.

[0003] Using two or more antennas at both the transmitting and receiving ends of a wireless communication system creates a Multiple-Input Multiple-Output (MIMO) system. MIMO systems fully utilize transmit and receive diversity techniques, increasing antenna diversity gain. The multiplexing gain obtained by transmitting independent data through different antennas is the primary means of increasing channel capacity. Under certain conditions, each transmit signal at the transmitting end uses different antennas to transmit multiple signals within the same frequency band. The receiving end also employs multiple antennas and corresponding processing techniques to receive the incoming signals. Because these signals are transmitted in the same time and frequency band, the spectral efficiency is particularly high, and the signal capacity increases linearly with the number of antennas.

[0004] Shared antenna: In MIMO terminal antenna design, two or more antennas sharing a radiator can be called a shared antenna. Generally speaking, the most common design is a shared antenna composed of two antennas. The core idea of ​​a shared antenna is to reduce the overall size of the entire antenna system by sharing a radiator.

[0005] The 5G sub-6GHz band includes 3.4-3.6GHz and 4.8-5.0GHz, so wide-bandwidth antennas need to be designed to cover these bands. The conventional solution is to use different antennas to cover different bands. However, considering that the terminal antenna also needs to be designed with MIMO antennas, the number of antennas will increase exponentially. Therefore, a wide-bandwidth antenna solution is needed that can cover the sub-6GHz band while ensuring a small antenna size. Summary of the Invention

[0006] The purpose of this invention is to provide a terminal MIMO antenna that solves the problem that the current multi-band requirements of 5G necessitate a large number of antennas, resulting in a large antenna system size, large space occupation, and high cost.

[0007] To address the aforementioned problems, the present invention provides a terminal MIMO antenna, comprising a rectangular dielectric substrate, a ground plane assembly, a first antenna assembly, a second antenna assembly, and a decoupling assembly; the ground plane assembly is located on the upper layer of the dielectric substrate; the first antenna assembly and the second antenna assembly are suspended above the ground plane assembly and connected to the ground plane assembly; the decoupling assembly is located on the upper layer of the dielectric substrate.

[0008] The floor assembly includes a rectangular first floor structure, a second floor structure, a third floor structure, and a fourth floor structure;

[0009] The decoupling assembly includes metal decoupling structures arranged sequentially along the long side of the dielectric substrate;

[0010] The first antenna assembly includes a rectangular first radiating structure, a first feeding structure, a second feeding structure, and a first metal connection structure; the first feeding structure is connected to the short side of the first radiating structure; the second feeding structure is connected to the long side of the first radiating structure; the first metal connection structure is connected to the first ground plane structure; the first feeding structure is electrically connected to the first ground plane structure; and the second feeding structure is electrically connected to the second ground plane structure.

[0011] The second antenna assembly includes a rectangular second radiating structure, a third feeding structure, a fourth feeding structure, and a second metal connection structure; the third feeding structure is connected to the short side of the second radiating structure; the fourth feeding structure is connected to the long side of the second radiating structure; the second metal connection structure is connected to the third ground plane structure; the third feeding structure is electrically connected to the third ground plane structure; and the fourth feeding structure is electrically connected to the fourth ground plane structure.

[0012] Optionally, in one type of terminal MIMO antenna, the length of the dielectric substrate is 120±12mm or 80±8mm.

[0013] Optionally, in one type of terminal MIMO antenna, the first ground plane structure and the third ground plane structure are the same size and are symmetrically arranged with respect to the center line of the short side of the dielectric substrate.

[0014] Optionally, in one type of terminal MIMO antenna, the length of the first ground plane structure and the third ground plane structure is 36±3.6mm, and the width is 4.5±0.45mm.

[0015] Optionally, in one type of terminal MIMO antenna, the second ground plane structure and the fourth ground plane structure are the same size and are symmetrically arranged with respect to the center line of the short side of the dielectric substrate.

[0016] Optionally, in one type of terminal MIMO antenna, the length of the second ground structure and the fourth ground structure is 91±9.1mm and the width is 36±3.6mm.

[0017] Optionally, in one type of terminal MIMO antenna, the distance between the first ground plane structure and the second ground plane structure is 24.5±4mm, and the distance between the third ground plane structure 23 and the fourth ground plane structure 24 is 24.5±4mm.

[0018] Optionally, in one type of terminal MIMO antenna, the first antenna assembly and the second antenna assembly are arranged in a mirror-symmetrical manner with respect to the center line of the short side of the dielectric substrate.

[0019] Optionally, in one type of terminal MIMO antenna, the first radiating structure and the second radiating structure are 3±0.3mm away from the dielectric substrate.

[0020] Optionally, in one type of terminal MIMO antenna, the first radiating structure and the second radiating structure have the same dimensions, with a length of 30.5±3mm and a width of 13.2±1mm.

[0021] Optionally, in one type of terminal MIMO antenna, the metal decoupling structure is a rectangular structure, a circular structure, or an "I"-shaped structure.

[0022] Optionally, in one type of terminal MIMO antenna, the metal decoupling structures are arranged sequentially and uniformly along the centerline of the short side of the dielectric substrate.

[0023] The beneficial effects of this invention are:

[0024] This invention achieves miniaturized antenna design by using a shared radiator to form a multi-MIMO antenna. The antenna assembly has feed points on both the short and long sides of the radiating structure, feeding the two feed points separately to realize a shared MIMO antenna and achieve cross-polarized radiation, improving the isolation of the shared antenna. Two antenna assemblies are placed above the dielectric substrate to realize a terminal 4-MIMO antenna. With a small overall antenna system size, occupying less space, and operating at low cost, while maintaining good isolation, a multi-MIMO antenna system is constructed, achieving good antenna radiation efficiency and good radiation direction characteristics. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a structural diagram of a terminal MIMO antenna provided in this embodiment;

[0027] Figure 2 This embodiment provides simulation results of the S-parameters and simulation graph of the antenna efficiency for a terminal MIMO antenna.

[0028] Figure 3 This embodiment provides a terminal MIMO antenna radiation pattern and gain simulation diagram;

[0029] The labels in the attached figures are explained as follows:

[0030] 1 – Dielectric substrate; 2 – Ground plane assembly; 3 – First antenna assembly; 4 – Second antenna assembly; 5 – Decoupling assembly; 21 – First ground plane structure; 22 – Second ground plane structure; 23 – Third ground plane structure; 24 – Fourth ground plane structure; 31 – First radiating structure; 32 – First feed structure; 33 – Second feed structure; 34 – First metal connection structure; 41 – Second radiating structure; 42 – Third feed structure; 43 – Fourth feed structure; 44 – Second metal connection structure. Detailed Implementation

[0031] The following detailed description, in conjunction with the accompanying drawings and specific embodiments, provides a further detailed description of a terminal MIMO antenna and terminal proposed in this invention. It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects in order to describe embodiments of the invention, and are not intended to describe a specific order or sequence. It should be understood that such uses of these terms can be interchanged where appropriate. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or devices.

[0032] This invention provides a scheme for forming a multi-MIMO antenna using a shared radiator, achieving miniaturized antenna design. The antenna assembly has feed points set on the short and long sides of the radiating structure, and feeds the two feed points separately to realize a shared MIMO antenna and achieve cross-polarized radiation, improving the isolation of the shared antenna. Two antenna assemblies are set above the dielectric substrate to realize a terminal 4MIMO antenna.

[0033] Figure 1 This is a structural diagram of a terminal MIMO antenna provided in this embodiment. The terminal MIMO antenna includes a rectangular dielectric substrate 1, a ground plane assembly 2, a first antenna assembly 3, a second antenna assembly 4, and a decoupling assembly 5.

[0034] More preferably, the length of the dielectric plate 1 is 120±12mm or 80±8mm.

[0035] The floor assembly 2 is located on the upper layer of the medium plate 1; the floor assembly 2 includes a rectangular first floor structure 21, a second floor structure 22, a third floor structure 23 and a fourth floor structure 24.

[0036] The first antenna assembly 3 and the second antenna assembly 4 are suspended above and connected to the floor assembly 2. Specifically, the first antenna assembly 3 and the second antenna assembly 4 can be supported by a plastic bracket. The first antenna assembly 3 and the second antenna assembly 4 are arranged in a mirror-symmetrical manner with respect to the center line of the short side of the dielectric substrate 1. The first antenna assembly 3 includes a rectangular first radiating structure 31, a first feeding structure 32, a second feeding structure 33, and a first metal connection structure 34. The first feeding structure 32 is connected to the short side of the first radiating structure 31. The second feeding structure 33 is connected to the long side of the first radiating structure 31. The first metal connection structure 34 is connected to the first floor assembly 2. Structure 21 is connected; the first feed structure 32 is electrically connected to the first ground plane structure 21; the second feed structure 33 is electrically connected to the second ground plane structure 22; the second antenna assembly 4 includes a rectangular second radiating structure 41, the third feed structure 42, the fourth feed structure 43, and the second metal connection structure 44; the third feed structure 42 is connected to the short side of the second radiating structure 41; the fourth feed structure 43 is connected to the long side of the second radiating structure 41; the second metal connection structure 44 is connected to the third ground plane structure 23; the third feed structure 42 is electrically connected to the third ground plane structure 23; the fourth feed structure 44 is electrically connected to the fourth ground plane structure 24.

[0037] More preferably, the first floor structure 21 and the third floor structure 23 are the same size and symmetrically arranged with respect to the center line of the short side of the medium plate 1 (a dashed line passing through the midpoint of the short side of the rectangle and perpendicular to the short side of the rectangle is the center line of the short side of the rectangle). The length of the first floor structure 21 and the third floor structure 23 is 36±3.6mm and the width is 4.5±0.45mm. The second floor structure 22 and the fourth floor structure 24 are the same size and symmetrically arranged with respect to the center line of the short side of the medium plate 1. The length of the second floor structure 22 and the fourth floor structure 24 is 91±9.1mm and the width is 36±3.6mm. Thus, the floor assembly 2 forms a small floor group consisting of the first floor structure 21 and the third floor structure 23, and a large floor group consisting of the second floor structure 22 and the fourth floor 24; the two feed points of the first antenna assembly 3 and the second antenna assembly 4 are respectively connected to a small floor structure and a large floor structure, respectively feeding the two feed points, so that the first antenna assembly 3 and the second antenna assembly 4 can each form a dual MIMO antenna, and the grounding area of ​​each antenna is different, which can better adjust different antenna frequency bands, thereby better covering various frequency points of 5G.

[0038] More preferably, the distance between the first radiating structure 31 and the second radiating structure 41 and the dielectric substrate 1 is 3±0.3mm; the first radiating structure 31 and the second radiating structure 32 are of equal size, with a length of 30.5±3mm and a width of 13.2±1mm. The radiating structures of the antenna of the present invention are all rectangular structures, symmetrically arranged, without branches extending out, relatively regular, occupying less space, and not affecting the design of other terminal components.

[0039] More preferably, the distance between the first ground plane structure 21 and the second ground plane structure 22 is 24.5±4mm, and the distance between the third ground plane structure 23 and the fourth ground plane structure 24 is 24.5±4mm, which can initially ensure good isolation between the antennas at the feed end.

[0040] The decoupling component 5 is located on the upper layer of the dielectric substrate. The decoupling component 5 includes metal decoupling structures arranged sequentially along the long side of the dielectric substrate. The metal decoupling structure is a rectangular structure, a circular structure, or an "I"-shaped structure. In this embodiment, a rectangular decoupling structure is selected, and the metal decoupling structures are arranged sequentially and evenly along the center line of the short side of the dielectric substrate. Due to the limited size of the terminal, even if a large distance is maintained between the ground plane structures, mutual coupling of the antenna structures is still inevitable. The addition of the decoupling component 5 can effectively achieve the decoupling effect and further improve the isolation between the multi-MIMO antennas.

[0041] Figure 2 The simulation results of the S-parameters and the simulation diagram of the antenna efficiency of a terminal MIMO antenna provided in this embodiment show that the isolation between the shared antennas is greater than 10dB in the range of 3.4-3.6GHz, and the radiation efficiency of the antennas is greater than 60%. An isolation of 10dB is a very good isolation performance for shared antennas. Furthermore, the isolation between the first antenna component 3 and the second antenna component 4 is greater than 20dB, indicating good isolation performance.

[0042] Figure 3 This embodiment provides a simulation diagram of the radiation pattern and gain of a terminal MIMO antenna. As can be seen from the diagram, the main radiation direction of the MIMO antenna near 3.5GHz is along the z-direction, achieving good half-space omnidirectional radiation characteristics.

[0043] In summary, this embodiment provides a terminal MIMO antenna, characterized by comprising a rectangular dielectric substrate, a ground plane assembly, a first antenna assembly, a second antenna assembly, and a decoupling assembly; the ground plane assembly is located on the upper layer of the dielectric substrate; the first antenna assembly and the second antenna assembly are suspended above the ground plane assembly and connected to it; the decoupling assembly is located on the upper layer of the dielectric substrate; a scheme of forming a multi-MIMO antenna using a shared radiator is adopted, achieving miniaturized antenna design; the antenna assembly has feed points set on the short and long sides of the radiating structure, and feeds the two feed points respectively to realize a shared MIMO antenna, and achieves cross-polarized radiation, improving the isolation of the shared antenna; two antenna assemblies are set above the dielectric substrate to realize a terminal 4MIMO antenna; under the premise of small overall antenna system size, occupying less space, using lower cost, and good isolation, a multi-MIMO antenna system is constructed, achieving good antenna radiation efficiency and good radiation direction characteristics.

[0044] The above description is merely a description of preferred embodiments of the present invention and is not intended to limit the scope of the present invention in any way. Any changes or modifications made by those skilled in the art based on the above disclosure shall fall within the protection scope of the claims.

Claims

1. A terminal MIMO antenna, characterized in that, The device includes a dielectric substrate, a ground plane assembly, an antenna assembly, and a decoupling assembly; the ground plane assembly is located on the upper layer of the dielectric substrate; the antenna assembly includes a first antenna assembly and a second antenna assembly; the first antenna assembly and the second antenna assembly are suspended above the ground plane assembly and connected to the ground plane assembly; the decoupling assembly is located on the upper layer of the dielectric substrate. The floor assembly includes a rectangular first floor structure, a second floor structure, a third floor structure, and a fourth floor structure; the decoupling assembly includes sequentially arranged metal decoupling structures. The first antenna assembly includes a rectangular first radiating structure, a first feeding structure, and a second feeding structure; the first feeding structure is connected to the short side of the first radiating structure. The second power supply structure is connected to the long side of the first radiation structure; the first power supply structure is electrically connected to the first floor structure; the second power supply structure is electrically connected to the second floor structure. The second antenna assembly includes a rectangular second radiating structure, a third feeding structure, and a fourth feeding structure; the third feeding structure is connected to the short side of the second radiating structure; the fourth feeding structure is connected to the long side of the second radiating structure; the third feeding structure is electrically connected to the third ground plane structure; and the fourth feeding structure is electrically connected to the fourth ground plane structure. The first floor structure and the third floor structure form a small floor group, and the second floor structure and the fourth floor structure form a large floor group; The two feed points of the first antenna assembly are connected to the first ground plane structure and the second ground plane structure, and the two feed points of the second antenna assembly are connected to the third ground plane structure and the fourth ground plane structure, so that the first antenna assembly and the second antenna assembly each form a dual MIMO antenna.

2. A terminal MIMO antenna according to claim 1, characterized in that, The dielectric substrate has a rectangular structure, with a length of 120±12mm and a width of 80±8mm.

3. A terminal MIMO antenna according to claim 1, characterized in that, The first floor structure and the third floor structure have the same dimensions and are symmetrically arranged with respect to the center line of the short side of the medium plate. The length of the first floor structure and the third floor structure is 36±3.6mm and the width is 4.5±0.45mm.

4. A terminal MIMO antenna according to claim 1, characterized in that, The second floor structure and the fourth floor structure have the same dimensions and are symmetrically arranged with respect to the center line of the short side of the medium plate. The length of the second floor structure and the fourth floor structure is 91±9.1mm and the width is 36±3.6mm.

5. A terminal MIMO antenna according to claim 1, characterized in that, The distance between the first floor structure and the second floor structure is 24.5±4mm, and the distance between the third floor structure and the fourth floor structure is 24.5±4mm.

6. A terminal MIMO antenna according to claim 1, characterized in that, The first antenna assembly and the second antenna assembly are arranged in a mirror-symmetrical manner with respect to the center line of the short side of the dielectric substrate.

7. A terminal MIMO antenna according to claim 1, characterized in that, The first radiating structure and the second radiating structure are 3 ± 0.3 mm away from the dielectric plate.

8. A terminal MIMO antenna according to claim 1, characterized in that, The first radiating structure and the second radiating structure have the same dimensions, with a length of 30.5±3mm and a width of 13.2±1mm.

9. A terminal MIMO antenna according to claim 1, characterized in that, The first antenna assembly further includes a first metal connection structure, through which the first radiating structure is connected to the first ground structure, so that the first radiating structure is suspended above the first ground structure and the grounding effect is enhanced.

10. A terminal MIMO antenna according to claim 1, characterized in that, The second antenna assembly further includes a second metal connection structure, through which the second radiating structure is connected to the third ground plane structure, so that the second radiating structure is suspended above the third ground plane structure and the grounding effect is enhanced.

11. A terminal MIMO antenna according to claim 1, characterized in that, The metal decoupling structure is a rectangular structure, a circular structure, or an "I"-shaped structure.

12. A terminal MIMO antenna according to claim 1, characterized in that, The metal decoupling structures are arranged uniformly along the centerline of the short side of the dielectric substrate.

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