Dual-band four-element MIMO antenna integrated in 5G mobile terminal and 5G mobile terminal

Abstract

The application relates to a dual-frequency four-unit MIMO antenna integrated on a 5G mobile terminal, which comprises a grounding plate, a dielectric substrate, four antenna units and four decoupling structures. The dielectric substrate is oppositely arranged with the grounding plate and is spaced from the grounding plate to form an air cavity. The four antenna units are arranged on the side of the dielectric substrate away from the grounding plate, each of the antenna units comprises a metal patch, a feeding pin and a plurality of metal pins I, one end of the feeding pin is connected with the metal patch and the other end of the feeding pin is connected with the grounding plate to form a feeding port, one end of the plurality of metal pins I is connected with the metal patch and the other end of the plurality of metal pins I is connected with the grounding plate. One decoupling structure is arranged between any two adjacent antenna units. The metal pin I and the decoupling structure can solve the problems of antenna impedance matching and spatial mutual interference, and overcome the defects of the on-board antenna.

Description

Technical Field

[0001] This invention relates to the field of MIMO antenna technology, and in particular to a dual-band four-element MIMO antenna integrated on a 5G mobile terminal and the 5G mobile terminal itself. Background Technology

[0002] Mobile communication has now entered the 5G era. Compared to 4G, 5G offers higher speeds, lower latency, more connections, faster mobility, and greater security. Communication system theory dictates that a larger channel capacity leads to a higher data transmission rate, and Multiple-Input Multiple-Output (MIMO) technology effectively improves both channel capacity and transmission rate. MIMO antennas, or Multiple-Input Multiple-Output antenna systems, are a key technology in modern communication. MIMO antenna systems use multiple antennas for data transmission and communication, and through intelligent signal processing and demodulation algorithms, they can achieve higher transmission rates and better transmission quality within the same bandwidth. In modern communication systems, MIMO technology is a crucial means of improving data transmission rates and reliability. Simultaneously, the requirements for miniaturization and high integration place higher demands on antenna design.

[0003] Currently, most MIMO antenna structures are based on frame antenna designs, while onboard antenna designs are relatively weak. Furthermore, MIMO onboard antenna structures often suffer from problems such as antenna impedance matching, frequency selection, and spatial interference, which require complex network matching and correction techniques to solve. This results in low integration of MIMO antennas and makes them difficult to manufacture. Summary of the Invention

[0004] Based on this, it is necessary to address the relatively weak onboard antenna design of current MIMO antenna structures, and the fact that onboard antenna structures often suffer from problems such as antenna impedance matching, frequency selection, and spatial interference, which require complex network matching and correction techniques to solve. Therefore, it is necessary to provide a dual-band four-element MIMO antenna and a 5G mobile terminal integrated on a 5G mobile terminal.

[0005] This invention provides a dual-band four-element MIMO antenna integrated into a 5G mobile terminal, comprising:

[0006] Flooring;

[0007] dielectric substrate; and

[0008] Four antenna elements, all disposed on the side of the dielectric substrate away from the ground plane; the dielectric substrate is disposed opposite to the ground plane and a gap is left between them to form an air cavity; the dual-frequency four-element MIMO antenna further includes:

[0009] Four decoupling structures are provided, with one decoupling structure between any two adjacent antenna elements;

[0010] The antenna element includes:

[0011] Metal patches are attached to the dielectric substrate. The metal patches of the four antenna elements cooperate to form an intermediate gap, and there is a gap between any two adjacent metal patches of the antenna elements that communicates with the intermediate gap. The metal patches are provided with a slot 1 and a slot 2 of different lengths, and slot 1 and slot 2 are on the same straight line.

[0012] A power supply pin, one end of which is connected to the metal patch and the other end of which is connected to the ground plane, forming a power supply port; and

[0013] Several metal pins are provided, one end of which is connected to the metal patch and the other end of which is connected to the ground plane.

[0014] In a preferred embodiment of the present invention, the dielectric substrate has a square structure; the metal patch has a rectangular structure, and the middle gap has a square structure; in each metal patch, the adjacent long side and short side coincide with two adjacent sides of the dielectric substrate, and the outer long side of each metal patch and the outer short side of the adjacent metal patch both coincide with one side of the dielectric substrate.

[0015] In a preferred embodiment of the present invention, the four decoupling structures are respectively connected to the inner long sides of the metal patches of the four antenna elements, and the decoupling structures include:

[0016] Several metal pins are provided, one end of which is connected to the metal patch of the corresponding antenna element, and the other end of which is connected to the ground plane. The several metal pins are arranged in a straight line.

[0017] In a preferred embodiment of the present invention, in each antenna element, the plurality of metal pins are arranged in a straight line, and the straight line on which the plurality of metal pins are located is parallel to the straight line on which the plurality of metal pins of the corresponding decoupling structure are located.

[0018] And / or, in each of the antenna elements, the distance between any two adjacent metal pins is equal;

[0019] And / or, in each of the decoupling structures, the distance between two adjacent metal pins gradually decreases from the end near the intermediate gap to the end away from the intermediate gap;

[0020] And / or, the diameter of the second metal pin is smaller than the diameter of the first metal pin.

[0021] In a preferred embodiment of the present invention, in each antenna element, the distance between any two adjacent metal pins is 4mm, the distance between the metal pin and the long side of the metal patch on the outer side is 4mm, and the distance between the outermost metal pin and the short side of the metal patch on the outer side is 2mm.

[0022] And / or, in each of the decoupling structures, the minimum distance between two adjacent metal pins is 4mm, the maximum distance is 6mm, and the distance between the outermost metal pin and the corresponding metal patch on the outer short side is 2mm.

[0023] And / or, the diameter of the first metal pin is 0.6 mm, and the diameter of the second metal pin is 0.4 mm.

[0024] In a preferred embodiment of the present invention, each of the metal patches has two slots extending inward on its outer long side, and the slots are arranged along the width direction of the metal patch. The two slots are parallel to each other and the slots on any two adjacent metal patches are perpendicular to each other.

[0025] And / or, on each of the metal patches, two short sides are respectively provided with a slot 1 and a slot 2 extending inward thereto, the slot 1 and the slot 2 are arranged along the length direction of the metal patch and the slot 1 and the slot 2 are on the same straight line.

[0026] And / or, the first slot, the second slot, and the third slot are all rectangular slots, and the widths of the first slot and the second slot are equal and greater than the width of the third slot.

[0027] And / or, the length of the second slot is less than the length of the third slot, but greater than the length of the first slot.

[0028] In a preferred embodiment of the present invention, on each of the metal patches, the width of the third slot is 0.25 mm, and the widths of the first slot and the second slot are 0.5 mm.

[0029] And / or, on each of the metal patches, the length of the third slot is 11.5 mm, the length of the first slot is 5.8 mm, and the length of the second slot is 15.8 mm;

[0030] And / or, on each of the metal patches, the distance between the two slots is 16 mm;

[0031] And / or, on each of the metal patches, the distance between the first slot, the second slot and the long side of the metal patch on the inner side is 1.5 mm.

[0032] In a preferred embodiment of the present invention, in each of the antenna elements, the feed pin is located between the straight line containing the plurality of metal pins one and the straight line containing the plurality of metal pins two;

[0033] And / or, in each of the antenna elements, the distance between the feed pin and the long side of the metal patch on the outside is 8mm, and the distance between the feed pin and the short side of the metal patch on the outside is 14mm;

[0034] And / or, the diameter of the power supply pin is 1.32 mm.

[0035] In a preferred embodiment of the present invention, the metal patch has a length of 22mm and a width of 17.5mm, and the width of the middle gap is 5mm; the gap formed between any two adjacent metal patches of the antenna element is a rectangular structure, and the width of the gap is 0.5mm.

[0036] And / or, the dielectric substrate is made of FR-4 material, the dielectric substrate has a thickness of 0.2 mm and a width of 40 mm;

[0037] And / or, the height of the air cavity is 1.8 mm;

[0038] And / or, the grounding plate has a rectangular structure, with a length of 155mm and a width of 76mm.

[0039] The present invention also proposes a 5G mobile terminal, which includes the aforementioned dual-band four-element MIMO antenna integrated on the 5G mobile terminal.

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] 1. In each antenna element of the dual-band four-element MIMO antenna of this invention, several metal pins are set on a metal patch, which serve as impedance matching points. This invention also incorporates a decoupling structure between any two adjacent antenna elements. This decoupling structure limits the current coupling of one antenna element to the adjacent antenna element, effectively preventing mutual coupling between antenna elements and avoiding spatial interference between adjacent antenna elements, thus improving isolation. By using metal pins and decoupling structures, this invention solves the problems of antenna impedance matching and spatial interference without the need for complex network matching and correction techniques, overcoming the shortcomings of onboard antennas and alleviating the design pressure of frame antennas.

[0042] 2. The metal pin 1 in each antenna element of this invention has a small volume, which can greatly reduce the size of the antenna element. At the same time, the decoupling structure is formed by several small metal pins 2, which reduces the distance between antenna elements while improving isolation, making the antenna elements very compact.

[0043] 3. In the dual-frequency four-element MIMO antenna of the present invention, an air cavity is formed by leaving a gap between the dielectric substrate and the ground plane. The use of two dielectrics can reduce the attenuation of the antenna radiation process, thereby improving the radiation efficiency.

[0044] 4. In each antenna element of the dual-frequency four-element MIMO antenna of the present invention, dual-frequency effect is achieved by setting slot one and slot two of different lengths. The antenna element operates in the frequency bands of 3.46-3.65GHz and 5.62-5.98GHz, realizing dual-band communication. The isolation S21 can reach 12.3dB, and the radiation efficiency can reach -4.8dB and -1.6dB in the dual frequency bands, respectively. The ECC parameters are all below 0.15.

[0045] 5. The size of each antenna element in the dual-frequency four-element MIMO antenna of this invention is only 22*17.5mm. 2 The distance between any two adjacent antenna elements is only 0.5mm. The arrangement of the four antenna elements is very compact, which greatly saves space and allows for more space to be reserved for other terminal components, thus improving space utilization.

[0046] 6. The dual-band four-element MIMO antenna of the present invention consists of four small-sized antenna elements, which have the advantages of high integration, small and compact size, low profile, easy manufacturing, high performance and low cost. It can be integrated into 5G mobile terminals and can be widely used in 5G mobile terminal communication systems such as Wi-Fi, LTE, 5G, etc. Attached Figure Description

[0047] Figure 1 This is a schematic diagram of the structure of a dual-band four-element MIMO antenna integrated on a 5G mobile terminal according to an embodiment of the present invention;

[0048] Figure 2 for Figure 1 Side view;

[0049] Figure 3 for Figure 1 A magnified view of a portion of the image;

[0050] Figure 4 for Figure 1 Schematic diagram of the structure of the antenna unit;

[0051] Figure 5The coupling current diagram of the dual-band four-element MIMO antenna integrated on a 5G mobile terminal according to an embodiment of the present invention;

[0052] Figure 6 The figure shows the simulation results of the S-parameters of the dual-band four-element MIMO antenna integrated on a 5G mobile terminal according to an embodiment of the present invention.

[0053] Figure 7 The figure shows the simulation results of radiation efficiency and envelope correlation coefficient (ECC) of the dual-frequency four-element MIMO antenna integrated on a 5G mobile terminal according to the embodiments of the present invention.

[0054] Reference numerals in the attached diagram: 1. Ground plane; 2. Dielectric substrate; 3. Antenna element; 31. Metal patch; 32. Feed pin; 33. Metal pin one; 34. Slot three; 35. Slot one; 36. Slot two; 4. Metal pin two; 5. Intermediate gap; 6. Gap; 7. Air cavity. Detailed Implementation

[0055] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. 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.

[0056] This embodiment proposes a dual-band, four-element MIMO antenna integrated into a 5G mobile terminal, primarily used in 5G mobile terminals such as mobile phones, tablets, and IoT terminals to achieve multi-antenna technology and dual-band communication for 5G communication. Please refer to... Figures 1-3 The dual-band four-element MIMO antenna integrated on a 5G mobile terminal in this embodiment includes a ground plane 1, a dielectric substrate 2, four antenna elements 3, and four decoupling structures. All four antenna elements 3 are attached to the side of the dielectric substrate 2 away from the ground plane 1, and a decoupling structure is provided between any two adjacent antenna elements 3. Please refer to... Figure 4 Each antenna element 3 includes a metal patch 31, a feed pin 32, and five metal pins 33.

[0057] Ground plane 1 is used to ground the antenna to improve antenna performance and protect the equipment. Grounding refers to connecting the antenna to the ground to eliminate problems such as electromagnetic interference and static electricity buildup. In the field of communications, grounding is very important, as it directly affects the quality of communication signals and the lifespan of equipment. In this embodiment, ground plane 1 has a rectangular structure with a length of 155mm and a width of 76mm.

[0058] In this embodiment, the dielectric substrate 2 is made of relatively low-cost FR-4 material and has a square structure. The dielectric substrate 2 has a width of 40mm and a thickness of 0.2mm. The dielectric substrate 2 is arranged parallel to and opposite to the ground plane 1, with a gap between them forming an air cavity 7. The height of the air cavity 7 is 1.8mm. Using a mixture of two dielectrics can reduce the attenuation during antenna radiation, thereby improving radiation efficiency. The projection of the dielectric substrate 2 onto the ground plane 1 is located in the middle of the ground plane 1. The distances between two opposite edges of the projection and the two long sides of the ground plane 1 are 17.5mm and 18.5mm, respectively, and the distances between the other two opposite edges of the projection and the two short sides of the ground plane 1 are both 57.5mm.

[0059] In each antenna element 3, a metal patch 31 is attached to the dielectric substrate 2. The metal patches 31 of the four antenna elements 3 cooperate to form an intermediate gap 5, and a gap communicating with the intermediate gap 5 is left between any two adjacent metal patches 31 of the antenna elements 3. In this embodiment, the metal patch 31 adopts a rectangular structure with a length of 22mm and a width of 17.5mm. Please refer to... Figure 3 Each metal patch 31 has its adjacent outer long and short sides coinciding with two adjacent sides of the dielectric substrate 2. Furthermore, the outer long side of each metal patch 31 and the outer short side of its adjacent metal patch 31 both coincide with one side of the dielectric substrate 2. This results in a rectangular gap 6 between any two adjacent antenna elements 3 with a width of only 0.5 mm, while the central gap 5 is square with a width of 5 mm. This arrangement of the four antenna elements 3 is very compact, significantly saving space and allowing more room for other terminal components, thus improving space utilization.

[0060] In this embodiment, in each antenna unit 3, two slots 35 and 36 are respectively formed on the two short sides of the metal patch 31 near the long side on the inner side. The slots 35 and 36 are on the same straight line. Both slots 35 and 36 are rectangular slots. The length of slot 35 is 5.8 mm, the length of slot 36 is 15.8 mm, the distance between slots 35 and 36 is 0.4 mm, the width of slots 35 and 36 is 0.5 mm, and the distance between slots 35 and 36 and the long side on the inner side of the metal patch 31 is 1 mm. By setting slots 35 and 36 of different lengths, a dual-band effect is achieved, enabling each antenna element 3 to operate in the 3.46-3.65GHz and 5.62-5.98GHz frequency bands, thereby realizing dual-band communication.

[0061] In each antenna element 3, two slots 34 extending inward from their outer long sides are formed on the metal patch 31. These slots 34 are arranged along the width of the metal patch 31, forming a long strip structure. Each slot 34 has a width of 0.25 mm and a length of 11.5 mm. The distance between the two slots 34 is 16 mm. One slot 34 is 3.875 mm from the outer short side of the metal patch 31, and the other slot 34 is 2.125 mm from the inner short side of the metal patch 31. The two slots 34 on the metal patch 31 are parallel to each other, and any two adjacent slots 34 on the metal patch 31 are perpendicular to each other. In this embodiment, the use of two 0.25 mm slots 34 can improve impedance matching.

[0062] In each antenna element 3, one end of the feed pin 32 is connected to its metal patch 31, and the other end of the feed pin 32 is connected to the ground plane 1, thus forming a feed port. The diameter of the feed pin 32 is 1.32 mm, the distance between the feed pin 32 and the outer long side of the metal patch 31 is 8 mm, and the distance between the feed pin 32 and the outer short side of the metal patch 31 is 14 mm. The feed pin 32 is the interface of the electronic device that connects the signal source or driver to the antenna, playing an important role in the wireless communication system, enabling the transmission of signals from the source to the antenna, thereby realizing signal transmission and reception.

[0063] In each antenna element 3, one end of each of the five metal pins 33 is connected to the metal patch 31 of the antenna element 3, and the other end of each of the five metal pins 33 is connected to the ground plane 1. The five metal pins 33 are arranged in a straight line along the length of the metal patch 31. The diameter of each metal pin 33 is 0.6 mm, and the distance between any two adjacent metal pins 33 is 4 mm. The distance between the outermost long side of the metal pin 33 and the outermost short side of the metal patch 31 is 2 mm, and the distance between the outermost metal pin 33 and the inner short side of the metal patch 31 is 4 mm. In this embodiment, by setting five relatively small metal pins 33 in the antenna element 3, not only is impedance matching achieved, but the size of the antenna element 3 can also be greatly reduced.

[0064] A decoupling structure is provided between any two adjacent antenna elements 3. The decoupling structure can limit the current coupling of antenna element 3 to the other adjacent antenna element 3, effectively preventing mutual coupling between antenna elements 3, avoiding spatial interference between two adjacent antenna elements 3, and improving isolation. The four decoupling structures are respectively connected to the inner long side of the metal patch 31 of the four antenna elements 3. Specifically, each decoupling structure includes five metal pins 4, one end of each of the five metal pins 4 is connected to the corresponding metal patch 31, and the other end of each of the five metal pins 4 is connected to the ground plane 1. In this embodiment, the five metal pins 4 are linearly distributed along the length of the corresponding metal patch 31. In each decoupling structure, the distance between two adjacent metal pins 4 gradually decreases from the end near the middle gap 5 to the end away from the middle gap 5, with a minimum distance of 4mm and a maximum distance of 6mm. In each decoupling structure, the distance between the outermost metal pin 4 and the outer short side of the corresponding metal patch 31 is 2mm. In this embodiment, the diameter of the second metal pin 4 is 0.4 mm. In this embodiment, the decoupling structure is formed by several small metal pins 4, which, while improving isolation, also reduces the distance between antenna elements 3, making the antenna elements 3 very compact. Conventional antennas typically increase the distance between antenna elements to enhance isolation, but the antenna in this embodiment avoids this approach.

[0065] Please combine Figure 5 , Figure 5 This diagram compares the coupling current of the antenna structure with and without metal pin two in this embodiment. Figure 5 The left side shows the structure without metal pin 4, and the right side shows the structure with metal pin 4. It can be seen that adding metal pin 4 can effectively reduce the influence of coupling current. Therefore, when metal pin 4 is added near the edge of adjacent antenna element 3, current coupling to adjacent antenna element 3 can be limited, effectively preventing mutual coupling between antenna elements 3, improving isolation, and making the antenna elements 3 very compact.

[0066] In this embodiment, each antenna element 3 of the dual-band four-element MIMO antenna measures only 22*17.5mm. 2 The distance between any two adjacent antenna elements 3 is only 0.5mm. The arrangement of the four antenna elements 3 is very compact, which greatly saves space and can be integrated into 5G mobile terminals. It can reserve more space for other components of 5G mobile terminals and improve space utilization.

[0067] The technical performance of the MIMO antenna in this embodiment will be further described below, based on simulation experiments:

[0068] Please refer to Figure 6 The horizontal axis represents frequency, and the vertical axis represents the antenna S-parameters. Figure 6 As can be seen from the S-parameters, the dual-band MIMO antenna in this embodiment can cover the ranges of 3.46-3.65GHz and 5.62-5.98GHz, and the isolation S21 can reach 12.3dB.

[0069] Please refer to Figure 7 The horizontal axis represents frequency, and the vertical axis represents antenna radiation efficiency and ECC parameters. It can be seen that the radiation efficiency can reach -4.8dB and -1.6dB in both frequency bands, and the ECC parameters are both below 0.15. The envelope correlation coefficient (ECC) is an important parameter for MIMO antennas, characterizing the correlation between elements. The lower the ECC, the higher the channel capacity of the antenna during actual operation.

[0070] The simulation results above demonstrate that the present invention exhibits omnidirectional radiation characteristics in the 3.46-3.65GHz and 5.62-5.98GHz frequency bands.

[0071] This invention presents a dual-band, four-element MIMO antenna with advantages such as high integration, compact size, low profile, ease of manufacturing, high performance, and low cost. It can be widely used in 5G mobile terminal communication systems, such as Wi-Fi, LTE, and 5G, alleviating the design pressure of bezel antennas. During application, the antenna structure can be fine-tuned and optimized according to specific circumstances to achieve the best communication effect and performance.

[0072] It should be noted that when a component is said to be "installed on" another component, it can be directly on the other component or it may be in a component that is centered on it. When a component is said to be "set on" another component, it can be directly set on the other component or it may also be in a component that is centered on it. When a component is said to be "fixed to" another component, it can be directly fixed to the other component or it may also be in a component that is centered on it.

[0073] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0074] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0075] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A dual-band four-element MIMO antenna integrated into a 5G mobile terminal, comprising: Grounding plate (1); Dielectric substrate (2); as well as Four antenna units (3) are disposed on the side of the dielectric substrate (2) away from the ground plane (1); The feature is that the dielectric substrate (2) is disposed opposite to the ground plane (1) and a gap is left between them to form an air cavity (7); the dual-frequency four-element MIMO antenna further includes: Four decoupling structures are provided between any two adjacent antenna elements (3); The antenna element (3) includes: Metal patches (31) are attached to the dielectric substrate (2). The metal patches (31) of the four antenna units (3) are fitted together to form an intermediate gap (5). A gap (6) communicating with the intermediate gap (5) is left between any two adjacent metal patches (31) of the antenna units (3). The metal patches (31) are provided with a first gap (35) and a second gap (36) of different lengths. The first gap (35) and the second gap (36) are on the same straight line. A power supply pin (32), one end of which is connected to the metal patch (31) and the other end of which is connected to the ground plane (1), forms a power supply port; and A plurality of metal pins (33) are connected at one end to the metal patch (31) and at the other end to the ground plane (1); The four decoupling structures are respectively connected to the inner long sides of the metal patches (31) of the four antenna elements (3), and the decoupling structures include: Several metal pins (4) are arranged in a straight line. One end of each metal pin (4) is connected to the metal patch (31) of the corresponding antenna unit (3), and the other end of each metal pin (4) is connected to the ground plane (1). The several metal pins (4) are arranged in a straight line. In each antenna unit (3), several metal pins (33) are arranged in a straight line. The straight line of the several metal pins (33) is parallel to the straight line of the several metal pins (4) of the corresponding decoupling structure.

2. The dual-band four-element MIMO antenna integrated on a 5G mobile terminal according to claim 1, characterized in that, The dielectric substrate (2) has a square structure; the metal patch (31) has a rectangular structure, and the middle gap (5) has a square structure; in each metal patch (31), the adjacent long side and short side coincide with two adjacent sides of the dielectric substrate (2), and the outer long side of each metal patch (31) and the outer short side of the adjacent metal patch (31) both coincide with one side of the dielectric substrate (2).

3. The dual-band four-element MIMO antenna integrated on a 5G mobile terminal according to claim 2, characterized in that, In each of the antenna units (3), the plurality of metal pins one (33) are arranged in a straight line, and the straight line where the plurality of metal pins one (33) are located is parallel to the straight line where the plurality of metal pins two (4) of the corresponding decoupling structure are located. And / or, in each of the antenna elements (3), the distance between any two adjacent metal pins (33) is equal; And / or, in each of the decoupling structures, the distance between two adjacent metal pins (4) gradually decreases from the end near the intermediate gap (5) to the end away from the intermediate gap (5); And / or, the diameter of the second metal pin (4) is smaller than the diameter of the first metal pin (33).

4. The dual-band four-element MIMO antenna integrated on a 5G mobile terminal according to claim 3, characterized in that, In each of the antenna elements (3), the distance between any two adjacent metal pins (33) is 4mm, the distance between the metal pin (33) and the long side of the metal patch (31) on the outside is 4mm, and the distance between the outermost metal pin (33) and the short side of the metal patch (31) on the outside is 2mm. And / or, in each of the decoupling structures, the minimum distance between two adjacent metal pins (4) is 4mm, the maximum distance is 6mm, and the distance between the outermost metal pin (4) and the corresponding metal patch (31) on the outer side is 2mm. And / or, the diameter of the first metal pin (33) is 0.6 mm and the diameter of the second metal pin (4) is 0.4 mm.

5. The dual-band four-element MIMO antenna integrated on a 5G mobile terminal according to claim 2, characterized in that, On each of the metal patches (31), two slots (34) extending inward are provided on the long side on the outer side and the slots (34) are arranged along the width direction of the metal patch (31). The two slots (34) are parallel to each other and the slots (34) on any two adjacent metal patches (31) are perpendicular to each other. And / or, on each of the metal patches (31), two short sides are respectively provided with a slot one (35) and a slot two (36) extending inward thereto, and the slot one (35) and slot two (36) are arranged along the length direction of the metal patch (31); And / or, the first slot (35), the second slot (36), and the third slot (34) are all rectangular slots, and the widths of the first slot (35) and the second slot (36) are equal and greater than the width of the third slot (34); And / or, the length of the second slot (36) is less than the length of the third slot (34) and greater than the length of the first slot (35).

6. The dual-band four-element MIMO antenna integrated on a 5G mobile terminal according to claim 5, characterized in that, On each of the metal patches (31), the width of the third slot (34) is 0.25 mm, and the widths of the first slot (35) and the second slot (36) are 0.5 mm. And / or, on each of the metal patches (31), the length of the third slot (34) is 11.5 mm, the length of the first slot (35) is 5.8 mm, and the length of the second slot (36) is 15.8 mm; And / or, on each of the metal patches (31), the distance between the two slots (34) is 16 mm; And / or, on each of the metal patches (31), the distance between the first slot (35), the second slot (36) and the long side of the metal patch (31) on the inner side is 1.5 mm.

7. The dual-band four-element MIMO antenna integrated on a 5G mobile terminal according to claim 1, characterized in that, In each of the antenna elements (3), the feed pin (32) is located between the straight line containing the plurality of metal pins one (33) and the straight line containing the plurality of metal pins two (4); And / or, in each of the antenna elements (3), the distance between the feed pin (32) and the long side of the metal patch (31) on the outside is 8 mm, and the distance between the feed pin (32) and the short side of the metal patch (31) on the outside is 14 mm. And / or, the diameter of the power supply pin (32) is 1.32 mm.

8. The dual-band four-element MIMO antenna integrated on a 5G mobile terminal according to claim 2, characterized in that, The length of the metal patch (31) is 22mm and its width is 17.5mm, and the width of the middle gap (5) is 5mm; the gap (6) formed between any two adjacent metal patches (31) of the antenna unit (3) is a rectangular structure and the width of the gap (6) is 0.5mm. And / or, the dielectric substrate (2) is made of FR-4 material, the dielectric substrate (2) has a thickness of 0.2 mm and a width of 40 mm; And / or, the height of the air cavity (7) is 1.8 mm; And / or, the grounding plate (1) is a rectangular structure, the length of the grounding plate (1) is 155mm and its width is 76mm.

9. A 5G mobile terminal, characterized in that, It includes a dual-band quad-element MIMO antenna integrated on a 5G mobile terminal as described in any one of claims 1-8.

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