A terminal ultra-wideband MIMO antenna and multi-MIMO antenna system

Abstract

This invention provides a terminal ultra-wideband MIMO antenna and a multi-MIMO antenna system, including a ground plane, a side plate, a radiating element, a feeding element, and a grounding element; the side plate is disposed on the side of the ground plane; the back of the ground plane is covered with copper foil; the radiating element includes a rectangular first radiating structure, an inverted "L"-shaped second radiating structure, and a third radiating structure; the first radiating structure is located on the side plate; the second radiating structure is located on the upper layer of the ground plane; a slot structure is provided on the copper foil to form the third radiating structure; wherein, the first radiating structure is an inductive antenna, and the third radiating structure is a slot antenna, which is capacitive, forming a neutralization, thereby achieving a wider bandwidth; in addition, the second and third radiating structures are located on opposite sides of the ground plane, which can save internal space in the terminal; furthermore, multiple MIMO antennas can be set to form a terminal multi-MIMO antenna system.

Description

Technical Field

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

[0002] Coupling: When two or more radiating units are arranged in free space, a radiating unit is affected not only by the electromagnetic effect generated by its own current, but also by the electromagnetic effect generated by the current of other radiating units. Especially when the radiating units are close to each other, they will have complex interactions, which are called mutual coupling.

[0003] MIMO antenna: MIMO stands for Multiple-Input Multiple-Output. It is commonly used in IEEE 802.11n, but can also be used in other 802.11 technologies. MIMO technology can be broadly divided into two categories: transmit / receive diversity and spatial multiplexing. MIMO antennas are sometimes called spatial diversity because they use multiple spatial channels to transmit and receive data. MIMO technology can improve channel capacity.

[0004] With the rapid development of the wireless communication industry, especially the widespread adoption of 5G multi-band technology, supporting multiple 5G bands alone may require several antennas. This necessitates integrating more antennas into the limited internal space of mobile terminals. Therefore, terminal antenna manufacturers need to improve antenna structures to reduce their space occupancy. Existing technologies typically use a single-sided dielectric substrate for antenna design, which limits bandwidth due to size constraints, making it difficult to achieve wide-bandwidth radiation. For example, if coverage needs to encompass the N77, N78, and N79 bands, the reflection coefficient bandwidth must cover at least 3.2-5.0 GHz, a bandwidth design that traditional terminal antenna types cannot achieve.

[0005] In addition, the existing 5G Sub-6GHz band rarely covers WLAN-5GHz. Moreover, existing antennas often use stub radiation, making it difficult to design antennas using the metal frame of actual terminals.

[0006] In view of this, there is an urgent need to design a new type of wiring system to address the current requirements for antenna size and bandwidth. Summary of the Invention

[0007] The purpose of this invention is to provide a terminal ultra-wideband MIMO antenna that solves the problem that Sub-6GHz antennas often cannot simultaneously achieve good bandwidth and radiation efficiency.

[0008] To address the aforementioned problems, this invention provides a terminal ultra-wideband MIMO antenna, comprising a ground plane, a side plate, a radiating element, a feeding element, and a grounding element; the side plate is disposed on the side of the ground plane; the radiating element is electrically connected to the feeding element; the radiating element is electrically connected to the grounding element; the back of the ground plane is covered with copper foil; the radiating element includes a rectangular first radiating structure, an inverted "L"-shaped second radiating structure, and a third radiating structure; the first radiating structure is located on the side plate; the second radiating structure is located on the upper layer of the ground plane; a slot structure is provided on the copper foil to form the third radiating structure.

[0009] Optionally, in one type of terminal ultra-wideband MIMO antenna, the side plate is perpendicular to the ground.

[0010] Optionally, in one type of terminal ultra-wideband MIMO antenna, the ground plane further includes a perforated structure, and the grounding unit is located on the upper layer of the ground plane and connected to the copper foil on the back of the ground plane through the perforated structure.

[0011] Optionally, in one type of terminal ultra-wideband MIMO antenna, the grounding unit further includes a grounding strip and a grounding point, wherein the grounding point is located at the center of the hollow structure and is electrically connected to the grounding point.

[0012] Optionally, in one type of terminal ultra-wideband MIMO antenna, the feeding unit further includes a first feeding strip, a second feeding strip in the shape of an inverted "L", and a feeding point; the first feeding strip is located on the side plate and is electrically connected to both the first radiating structure and the second feeding strip; the second feeding strip is electrically connected to the feeding point.

[0013] Optionally, in one type of terminal ultra-wideband MIMO antenna, the second feed strip, which is inverted "L" shape, includes a long side and a short side that are perpendicular to each other, and the long side of the second feed strip, which is inverted "L" shape, is perpendicular to the side plate.

[0014] Optionally, in one type of terminal ultra-wideband MIMO antenna, the second radiating structure, which is inverted "L" shape, includes a long side and a short side that are perpendicular to each other. The long side of the second radiating structure, which is inverted "L" shape, is parallel to the side plate and electrically connected to the long side of the second feed strip.

[0015] Optionally, in one type of terminal ultra-wideband MIMO antenna, the third radiating structure is an inverted "L"-shaped slot structure, the inverted "L"-shaped slot structure includes a long side and a short side that are perpendicular to each other, and the long side of the inverted "L"-shaped slot structure is parallel to the side plate.

[0016] Optionally, in one type of terminal ultra-wideband MIMO antenna, the long side of the inverted "L"-shaped slot structure overlaps with the long side of the inverted "L"-shaped second radiating structure.

[0017] Optionally, in one type of terminal ultra-wideband MIMO antenna, the dielectric constant and thickness of the dielectric substrate of the ground plane and the side plate are the same.

[0018] Optionally, in one type of terminal ultra-wideband MIMO antenna, the length of the first radiating structure is 9±0.9mm and the width is 7.4±0.74mm.

[0019] Optionally, in the terminal ultra-wideband MIMO antenna, the length of the long side of the second radiating structure is 13.4±1.34mm and the width is 0.4±0.04mm, and the length of the short side of the second radiating structure is 1.9±0.19mm and the width is 0.7±0.07mm.

[0020] Optionally, in the terminal ultra-wideband MIMO antenna, the length of the long side of the third radiating structure is 8±8mm and the width is 1±0.1mm, and the length of the short side of the third radiating structure is 1±0.1mm and the width is 1±0.1mm.

[0021] The present invention also provides a multi-MIMO antenna system, wherein the multi-MIMO antenna system comprises at least two of the aforementioned terminal ultra-wideband MIMO antennas.

[0022] The beneficial effects of this invention are:

[0023] A terminal ultra-wideband MIMO antenna system is provided, comprising a floor, side panels, radiating elements, a feeding element, and a grounding element. The side panels are disposed beside the floor. The radiating elements are electrically connected to the feeding element and the grounding element. The back of the floor is covered with copper foil. The radiating elements include a rectangular first radiating structure, an inverted "L"-shaped second radiating structure, and a third radiating structure. The first radiating structure is located on the side panel. The second radiating structure is located on the upper layer of the floor. The third radiating structure is a slot antenna structure disposed on the back of the floor. The first radiating structure is an inductive antenna, and the third radiating structure is a slot antenna, which is capacitive and can form a neutralization (Booker's principle), thereby achieving a wider bandwidth. Furthermore, the second and third radiating structures are located on opposite sides of the floor, which can save internal space in the terminal. In addition, multiple MIMO antennas can be set to form a terminal multi-MIMO antenna system, which can further increase the bandwidth of the terminal antenna system and improve the user experience. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. 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.

[0025] Figure 1 This is a structural diagram of a terminal ultra-wideband MIMO antenna provided in this embodiment;

[0026] Figure 2 This is a partial structural diagram of a terminal ultra-wideband MIMO antenna provided in this embodiment;

[0027] Figure 3 This is a structural diagram of a terminal ultra-wideband 4MIMO antenna system provided in this embodiment;

[0028] Figure 4 This is a structural diagram of a terminal ultra-wideband 8MIMO antenna system provided in this embodiment;

[0029] Figure 5 This is a simulation diagram of the S-parameters of a terminal ultra-wideband 8MIMO antenna system provided in this embodiment;

[0030] Figure 6 This is a simulation diagram of the S-parameters of a single MIMO antenna in a terminal ultra-wideband 8MIMO antenna system provided in this embodiment;

[0031] Figure 7 This is a simulation diagram of the worst-case isolation of a terminal ultra-wideband 8MIMO antenna system provided in this embodiment;

[0032] Figure 8 This is a simulation diagram of the imaginary and real parts of a terminal ultra-wideband MIMO antenna system provided in this embodiment;

[0033] Figure 9 This is a simulation diagram of the antenna radiation efficiency of a terminal ultra-wideband 8MIMO antenna system provided in this embodiment;

[0034] The labels in the accompanying drawings are explained as follows:

[0035] 1 – Floor; 2 – Side panel; 3 – Radiation unit; 4 – Feeding unit; 5 – Grounding unit; 11 – Hollow structure; 31 – First radiation structure; 32 – Second radiation structure; 33 – Third radiation structure; 41 – First feeding strip; 42 – Second feeding strip; 43 – Feeding point; 51 – Grounding strip; 52 – Grounding point. Detailed Implementation

[0036] The following detailed description, in conjunction with the accompanying drawings, tables, and specific embodiments, provides a further detailed description of the terminal ultra-wideband 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.

[0037] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," 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.

[0038] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0039] Sub-6GHz: Fifth-generation mobile communication is mainly divided into two parts: millimeter wave and Sub-6GHz. Sub-6GHz refers to 5G frequencies below 6GHz. According to my country's Ministry of Industry and Information Technology (MIIT), this mainly includes the N1, N28, N41, N77, N78, and N79 bands. However, currently, the MIIT's network access requirements for 5G terminals only require support for the N77 and N78 bands; other bands are not yet mandatory. But with the continuous development of 5G base station construction, future 5G terminals will likely support all of the above bands, which is a major trend in my country's 5G development. Generally, a Sub-6GHz antenna needs to cover the 3.3-5GHz band to fully cover the N77 / 78 / 79 bands.

[0040] The WLAN-5GHz band, ranging from 5.18 to 5.825 GHz, is the frequency band responsible for Wi-Fi transmission.

[0041] Currently, most antenna designs employ a same-side dielectric substrate distribution for antenna routing. However, due to limited terminal space, achieving high bandwidth is difficult. If coverage is required for the N77, N78, and N79 frequency bands, the reflection coefficient bandwidth must cover at least 3.2-5.0 GHz, a bandwidth that traditional terminal antennas struggle to achieve. Furthermore, existing antenna designs primarily utilize more antenna stubs to increase bandwidth, without addressing side bezel routing or slot antennas. Additionally, current 5G Sub-6GHz bands rarely cover WLAN-5GHz.

[0042] This invention provides a terminal ultra-wideband MIMO antenna comprising a floor, side plates, radiating elements, a feeding element, and a grounding element. The side plates are disposed beside the floor. The back of the floor is covered with copper foil. The radiating elements include a rectangular first radiating structure, an inverted "L"-shaped second radiating structure, and a third radiating structure. The first radiating structure is located on the side plate. The second radiating structure is located on the upper layer of the floor. The third radiating structure is a slot antenna structure disposed on the back of the floor. The first radiating structure is an inductive antenna, and the third radiating structure is a slot antenna, exhibiting capacitive behavior, which can achieve neutralization (Booker's principle), thereby achieving a wider bandwidth. Furthermore, the second and third radiating structures are located on opposite sides of the floor, saving internal space in the terminal. In addition, multiple MIMO antennas can be configured to form a terminal multi-MIMO antenna system, further increasing the bandwidth of the terminal antenna system and improving the user experience.

[0043] Please see Figure 1 The terminal ultra-wideband MIMO antenna provided by the present invention includes a ground plate 1, a side plate 2, a radiating element 3, a feeding element 4, and a grounding element 5; the side plate 2 is vertically connected to the ground plate 1; the radiating element 3 is electrically connected to the feeding element 4; the radiating element 3 is electrically connected to the grounding element 5, wherein the back of the ground plate 1 is covered with copper foil.

[0044] Please see Figure 2 , Figure 2The diagram shows the antenna structure of a terminal ultra-wideband MIMO antenna with the floor hidden. The radiating element 3 includes a rectangular first radiating structure 31, an inverted "L"-shaped second radiating structure 32, and a third radiating structure 33. The first radiating structure 31 is located on the side plate 2. The second radiating structure 32 is located on the upper layer of the floor. The third radiating structure 33 is a slot antenna structure disposed on the back of the floor 1. It can be seen that the second radiating structure 32 and the third radiating structure 33 are located on opposite sides of the floor 1. The feeding unit 4 also includes a first feeding strip 41, an inverted "L"-shaped second feeding strip 42, and a feeding point 43. The first feeding strip 41 is located on the side plate 2 and is electrically connected to both the first radiating structure 31 and the second feeding strip 42. The second feeding strip 42 is electrically connected to the feeding point 43. The second feeding strip 42 includes a long side and a short side that are perpendicular to each other, and the long side of the second feeding strip 42 is perpendicular to the side plate 2.

[0045] The inverted "L"-shaped second feed strip includes mutually perpendicular long and short sides, with the long side perpendicular to the side plate. The inverted "L"-shaped second radiating structure includes mutually perpendicular long and short sides, with the long side parallel to the side plate and electrically connected to the long side of the second feed strip. The third radiating structure is an inverted "L"-shaped slot structure, including mutually perpendicular long and short sides, with the long side parallel to the side plate. The long side of the inverted "L"-shaped slot structure overlaps with the long side of the inverted "L"-shaped second radiating structure.

[0046] Furthermore, the second radiating structure 32 is electrically connected to the long side of the second feed strip 42. After feeding, the second radiating structure 32 can couple to make the third radiating structure 33 also have a surface current distribution, thereby generating resonance. In this way, more radiating branches can be arranged in the limited antenna plane space through double-sided antenna wiring to improve the bandwidth of the MIMO antenna.

[0047] Importantly, the third radiating structure 33 is not limited to an inverted "L" shape. In other embodiments, the third radiating structure 33 can also be other shapes, such as rectangular or ring-shaped, as long as the third radiating structure 33 and the second radiating structure 32 have overlapping parts to form coupling.

[0048] Preferably, the second feeding strip has a long side length of 13.4±1.34mm and a width of 0.4±0.04mm, the first radiating structure has a length of 9±0.9mm and a width of 7.4±0.74mm, the second radiating structure has a long side length of 13.4±1.34mm and a width of 0.4±0.04mm, the second radiating structure has a short side length of 1.9±0.19mm and a width of 0.7±0.07mm, and the third radiating structure includes mutually perpendicular long and short sides. The long side of the third radiating structure has a length of 8±8mm and a width of 1±0.1mm, and the short side of the third radiating structure has a length of 1±0.1mm and a width of 1±0.1mm.

[0049] More preferably, the dielectric constant and thickness of the dielectric plates of the floor 1 and the side plate 2 are the same, preferably with a dielectric constant of 2.2 and a thickness of 0.68 mm, so that the radiation characteristics of the first radiation structure 31, the second radiation structure 32 and the third radiation structure 33 can be more stable.

[0050] The following, combined with Figure 8 The principle of MIMO antennas extending antenna bandwidth is further explained. Figure 8 The figure shows the simulation diagram of the imaginary and real parts of a terminal ultra-wideband MIMO antenna system provided in this embodiment. As can be seen from the figure, the imaginary part of Z11 hovers around 0 in the 3-8GHz range. This is mainly because the structure of the first radiating structure 31 is similar to a monopole antenna and exhibits inductive properties. The third radiating structure 33 is a slot antenna structure and is a capacitive antenna. Therefore, the capacitive and inductive properties are neutralized (Booker's principle), thereby achieving a wider bandwidth.

[0051] Example 1:

[0052] Please see Figure 3 This embodiment provides a terminal ultra-wideband 4 MIMO antenna system. As shown in the figure, in this embodiment, the first radiating structures 31 of the four terminal ultra-wideband MIMO antennas are preferably arranged on the same side 2, and the side 2 is perpendicularly connected to the long side of the floor 1. Each pair of terminal MIMO antennas forms a group, the second radiating structures 32 of the MIMO antennas extend in the same direction, the distance between MIMO antennas in the same group is 20mm, the minimum distance between MIMO antennas in different groups is 38mm, and the extension directions of the second radiating structures 32 are opposite. Thus, a terminal ultra-wideband 4 MIMO antenna system with internally stacked structures is formed.

[0053] It should be noted that the above-described arrangement of the terminal MIMO antennas is only a preferred arrangement in this embodiment. In other embodiments, the MIMO antennas of the terminal's ultra-wideband 4MIMO antenna can also be arranged in other ways, for example:

[0054] 1. The first radiating structure 31 is disposed on the same side 2, but the four MIMO antennas are arranged at equal distances, and it is only necessary to satisfy that the minimum distance between each MIMO antenna is greater than 20mm;

[0055] 2. The first radiating structure 31 is arranged in groups of two on different sides of the side 2. The MIMO antennas on the same side are arranged at equal distances, and it is only necessary to ensure that the minimum distance between each MIMO antenna is greater than 20mm.

[0056] Example 2:

[0057] Please see Figure 4 This embodiment provides a terminal ultra-wideband 8 MIMO antenna system. As can be seen from the figure, in this embodiment, the first radiating structure 31 of the four terminal ultra-wideband MIMO antennas is preferably arranged on the same side 2, and the side 2 is perpendicularly connected to the long side of the floor 1. Among them, every two terminal MIMO antennas form a group, the extension direction of the second radiating structure 32 of the MIMO antennas is the same, the distance between MIMO antennas in the same group is 20mm, the minimum distance between MIMO antennas in different groups is 38mm, and the extension direction of the second radiating structure 32 is opposite.

[0058] Thus, four of the aforementioned terminal ultra-wideband MIMO antennas are also arranged on the other side 2 to form a terminal 8MIMO antenna system with a symmetrical internal structure. In some other embodiments, the terminal 8MIMO antenna system may also have other arrangements, but it should be noted that the minimum distance between each MIMO antenna must be greater than 20mm. The specific antenna arrangement is well known to those skilled in the art and will not be described in detail here.

[0059] Figure 5 To illustrate this, a simulation diagram of the S-parameters of a terminal ultra-wideband 8 MIMO antenna system provided in this embodiment is given. Figure 6 This embodiment presents a simulation diagram of the S-parameters of a single MIMO antenna in a terminal ultra-wideband 8MIMO antenna system. Since the structure of each MIMO antenna in the entire terminal ultra-wideband 8MIMO antenna system is symmetrical, the simulation of the reflection coefficient of a single MIMO antenna can represent the reflection coefficient result of the entire 8MIMO antenna system. Combined with... Figure 5 and Figure 6As can be seen, the -6dB bandwidth reaches 2.8-7.9GHz, and the bandwidth of the entire antenna system is very high, surpassing previous terminal antenna solutions, and can well meet the design requirements.

[0060] Figure 7 The figure shows the worst isolation simulation of a terminal ultra-wideband 8 MIMO antenna system provided in this embodiment. As can be seen from the figure, the worst isolation of the terminal ultra-wideband 8 MIMO antenna system reaches more than 10 dB in the band. Therefore, the overall isolation of the MIMO antenna system has reached a good level.

[0061] It should be further noted that the above embodiments provide preferred solutions for 4MIMO and 8MIMO antenna systems for the terminal, respectively. It can be seen that in other embodiments, more MIMO antennas can be configured to form a multi-MIMO antenna system, such as a 12MIMO antenna system for the terminal. In this case, due to the further compression of internal space in the terminal, special structures may be needed to achieve the isolation between the MIMO antennas. Isolation optimization requires specific analysis based on the specific radiation effect of the antennas. Specific isolation optimization schemes are well known to those skilled in the art and will not be elaborated here.

[0062] Please refer to further information. Figure 9 , Figure 9 A simulation diagram of the antenna radiation efficiency of a terminal ultra-wideband 8MIMO antenna system provided in this embodiment is given. As can be seen from the figure, the in-band efficiency of the antenna is >60%, indicating that the terminal 8MIMO antenna system achieves good overall radiation and meets the design requirements.

[0063] In summary, this invention provides a terminal ultra-wideband MIMO antenna, comprising a ground plane, a side plate, a radiating element, a feeding element, and a grounding element; the side plate is disposed on the side of the ground plane; the radiating element is electrically connected to the feeding element; the radiating element is electrically connected to the grounding element; the back of the ground plane is covered with copper foil; the radiating element includes a rectangular first radiating structure, an inverted "L"-shaped second radiating structure, and a third radiating structure; the first radiating structure is located on the side plate; the second radiating structure is located on the upper layer of the ground plane; a slot structure is provided on the copper foil to form the third radiating structure; wherein, the first radiating structure is an inductive antenna, and the third radiating structure is a slot antenna, which is capacitive and can form neutralization (Booker's principle), thereby achieving a wider bandwidth; furthermore, the second and third radiating structures are located on opposite sides of the ground plane, which can save internal space in the terminal; in addition, multiple MIMO antennas can be set to form a terminal multi-MIMO antenna system, which can further increase the bandwidth of the terminal antenna system and improve the user experience.

[0064] 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 ultra-wideband MIMO antenna, characterized in that, It includes a floor, side panels, radiating units, a power supply unit, and a grounding unit; the side panels are disposed on the side of the floor; the radiating units are electrically connected to the power supply unit; the radiating units are electrically connected to the grounding unit; the back of the floor is covered with copper foil; the radiating unit includes a rectangular first radiating structure, an inverted "L"-shaped second radiating structure, and a third radiating structure; the first radiating structure is located on the side panel; The second radiating structure is located on the upper layer of the floor; a slot structure is provided on the copper foil to form the third radiating structure; the feeding unit further includes a first feeding strip, a second feeding strip in the shape of an inverted "L", and a feeding point; the first feeding strip is located on the side plate and is electrically connected to both the first radiating structure and the second feeding strip; the second feeding strip is electrically connected to the feeding point; the second feeding strip in the shape of an inverted "L" includes a long side and a short side that are perpendicular to each other, and the long side of the second feeding strip in the shape of an inverted "L" is perpendicular to the short side. The second radiating structure, which is in the shape of an inverted "L", includes a long side and a short side that are perpendicular to each other. The long side of the inverted "L" shaped second radiating structure is parallel to the side plate and electrically connected to the long side of the second feed strip. The third radiating structure is an inverted "L" shaped slot structure, which includes a long side and a short side that are perpendicular to each other. The long side of the inverted "L" shaped slot structure is parallel to the side plate. The long side of the inverted "L" shaped slot structure overlaps with the long side of the inverted "L" shaped second radiating structure.

2. The terminal ultra-wideband MIMO antenna according to claim 1, characterized in that, The side panel is perpendicular to the floor.

3. The terminal ultra-wideband MIMO antenna according to claim 1, characterized in that, The floor also includes a perforated structure, and the grounding unit is located on the upper layer of the floor and connected to the copper foil on the back of the floor through the perforated structure.

4. A terminal ultra-wideband MIMO antenna according to claim 3, characterized in that, The grounding unit also includes a grounding strip and a grounding point, wherein the grounding point is located at the center of the hollow structure and is electrically connected to the grounding point.

5. A terminal ultra-wideband MIMO antenna according to claim 1, characterized in that, The dielectric constant and thickness of the dielectric plates of the floor and the side plate are the same.

6. A terminal ultra-wideband MIMO antenna according to claim 1, characterized in that, The length of the first radiating structure is 9±0.9mm and the width is 7.4±0.74mm.

7. A terminal ultra-wideband MIMO antenna according to claim 1, characterized in that, The length of the long side of the second radiating structure is 13.4±1.34mm and the width is 0.4±0.04mm. The length of the short side of the second radiating structure is 1.9±0.19mm and the width is 0.7±0.07mm.

8. A terminal ultra-wideband MIMO antenna according to claim 1, characterized in that, The length of the long side of the third radiating structure is 8±8mm and the width is 1±0.1mm. The length of the short side of the third radiating structure is 1±0.1mm and the width is 1±0.1mm.

9. A multi-MIMO antenna system, characterized in that, The multi-MIMO antenna system includes at least two terminal ultra-wideband MIMO antennas as described in claims 1 to 8.

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