5G MIMO combined antenna and terminal

Abstract

This invention discloses a 5G MIMO combined antenna and terminal. The 5G MIMO combined antenna includes a substrate, a first antenna element, a second antenna element, and an isolation slot. A conductive layer is disposed on one side of the substrate. The first and second antenna elements have identical structures and each includes a first radiating part, a second radiating part, a third radiating part, and a feed part. The isolation slot is disposed near the centerline of the conductive layer in the width direction. The first and second antenna elements are symmetrically arranged about the isolation slot. This 5G MIMO combined antenna supports all current 5G frequency bands (sub-6GHz bands) globally, except for millimeter wave bands. It has the advantages of flexible operating frequency bands and large network capacity. The antenna structure is simple and compact, with good isolation between array elements, and good antenna electrical performance within the operating frequency band.

Description

Technical Field

[0001] This invention relates to the field of antenna technology, and in particular to a 5G MIMO combined antenna and terminal. Background Technology

[0002] With the development of wireless communication technology, people's need for communication is also increasing, which requires antennas to have multi-band characteristics. Currently, the shortcomings of 5G antennas are reflected in the fact that they are not full-band, which affects the user's communication experience.

[0003] While MIMO technology can meet the needs of multi-band communication and large-volume data transmission, antenna design is quite challenging, mainly due to the following: 1. The antenna needs to be miniaturized; 2. As the antenna size gradually decreases, the spacing between array elements also gradually decreases, leading to increased interference between array elements, which in turn affects the independence of data transmission, reduces channel capacity, and the mutual coupling effect between array elements also affects the antenna radiation efficiency, severely impacting the antenna's electrical performance.

[0004] Therefore, it is of great significance to design an antenna that is small in size, has high isolation between array elements, and can cover the entire 5G frequency band. Summary of the Invention

[0005] The purpose of this invention is to provide a 5G MIMO combined antenna and terminal for covering the entire 5G frequency band, and with the advantages of small size and high isolation.

[0006] The objective of this invention is achieved through the following technical solution:

[0007] A 5G MIMO combined antenna, comprising:

[0008] A substrate, wherein the substrate has a strip-shaped structure and a conductive layer is provided on one side of the substrate;

[0009] The first antenna unit and the second antenna unit have the same structure and each includes a first radiating part, a second radiating part, a third radiating part and a feed part. The first radiating part, the second radiating part and the third radiating part are connected in sequence and form an inverted "U" shaped structure above the conductive layer. The feed part is disposed on the first radiating part and is used to connect to the conductive layer.

[0010] An isolation seam is disposed near the centerline of the conductive layer in the width direction. The isolation seam is used to divide the conductive layer into an independent first reference ground and a second reference ground. The first antenna element is disposed on the first reference ground, and the second antenna element is disposed on the second reference ground. The first antenna element and the second antenna element are arranged symmetrically about the isolation seam.

[0011] In an alternative embodiment, a first gap is provided between the first antenna element and the isolation seam, the first gap being parallel to the isolation seam and the length of the first gap being less than the length of the isolation seam;

[0012] A second gap is provided between the second antenna element and the isolation gap. The second gap is parallel to the isolation gap and the length of the second gap is less than the length of the isolation gap.

[0013] In one alternative, the length of the first gap is 1 / 2 to 3 / 5 of the length of the isolation joint, and the length of the second gap is 1 / 2 to 3 / 5 of the length of the isolation joint.

[0014] In one alternative embodiment, the second radiating portion includes opposing first and third sides, opposing second and fourth sides, and opposing upper and lower surfaces;

[0015] The first radiating part includes an upper side and a lower side opposite to each other. A first arc angle and a second arc angle are respectively provided on both sides of the lower side of the first radiating part. The radius of the first arc angle is smaller than the radius of the second arc angle. The upper side of the first radiating part of the first antenna unit is connected to a portion of the first side of the second radiating part. The upper side of the first radiating part of the second antenna unit is connected to a portion of the third side of the second radiating part.

[0016] The second radiating part is provided with a first notch, a second notch and a third notch. The first notch of the first antenna element is provided on the first side and extends inward. The first notch of the second antenna element is provided on the third side and extends inward. The second notch is provided on the second side and extends to the fourth side. The third notch is provided on the fourth side.

[0017] The third radiating part includes an upper side and a lower side opposite to each other. The upper side of the third radiating part of the first antenna unit is connected to a portion of the third side of the second radiating part. The upper side of the third radiating part of the second antenna unit is connected to a portion of the first side of the second radiating part. The third radiating part extends downward.

[0018] In an alternative embodiment, when the first notch is close to the first side of the second radiating portion, the second notch is adjacent to the third side of the second radiating portion;

[0019] When the first notch is close to the third side of the second radiating part, the second notch is adjacent to the first side of the second radiating part;

[0020] The third notch is L-shaped and includes a first extension opening and a second extension opening connected together. The first extension opening extends from the fourth side of the second radiating part toward the line connecting the second side and the fourth side, and the second extension opening extends from the line connecting the first side and the third side of the second radiating part.

[0021] In an alternative embodiment, the lengths of the upper and lower sides of the first radiating part are 27-32 mm, and the distance between the upper and lower sides of the first radiating part is 26-30 mm.

[0022] The length of the first side of the second radiating part is 48-52mm, the length of the second side of the second radiating part is 45-49mm, the length of the third side of the second radiating part is 48-52mm, and the length of the fourth side of the second radiating part is 49-53mm.

[0023] The lengths of the upper and lower sides of the third radiating part are 48-52 mm, and the distance between the upper and lower sides of the third radiating part is 13-17 mm.

[0024] In an alternative embodiment, both the first antenna element and the second antenna element further include a short-circuit stub that connects to the second side of the second radiating section and extends downward.

[0025] In an alternative embodiment, the short-circuit stub of the first antenna element is connected to the second side of the second radiating part near the first side, and the short-circuit stub of the second antenna element is connected to the second side of the second radiating part near the third side.

[0026] The short-circuit stub has a length of 26-30 mm and a width of 5-7 mm.

[0027] In an alternative embodiment, the first antenna unit and the second antenna unit are located at opposite ends of the substrate along its length, with the first radiating portion of the first antenna unit and the first radiating portion of the second antenna unit facing each other in the same direction, and the short-circuit stubs of the first antenna unit and the short-circuit stubs of the second antenna unit having the same orientation.

[0028] In one optional embodiment, the 5G MIMO combined antenna has a length of 135-145mm, a width of 45-55mm, and a height of 23-33mm.

[0029] The first antenna unit and the second antenna unit work together to cover the 5G frequency band of 824-960MHz / 1710-7125MHz.

[0030] A terminal having the aforementioned 5G MIMO combined antenna.

[0031] Compared with the prior art, the beneficial effects of the present invention include at least the following:

[0032] 1. It supports all 5G frequency bands (excluding millimeter wave and sub-6GHz bands) currently available globally, and has the advantages of flexible operating frequency bands and large network capacity.

[0033] 2. The antenna has a simple structure and compact size, with good isolation between array elements, and good electrical performance within the operating frequency band. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the structure of the first antenna unit according to an embodiment of the present invention.

[0035] Figure 2 This is a schematic diagram of the structure of the second antenna unit in an embodiment of the present invention.

[0036] Figure 3 This is a schematic diagram of the structure of a 5G MIMO combined antenna according to an embodiment of the present invention.

[0037] Figure 4 This is the radiation pattern of the 5G MIMO combined antenna in this embodiment of the invention at 900MHz.

[0038] Figure 5 This is a graph showing the test results of the voltage standing wave ratio (VSWR) of the first and second antenna elements in the 5G MIMO combined antenna according to an embodiment of the present invention.

[0039] Figure 6 This is a test result diagram of the isolation between the first antenna element and the second antenna element in the 5G MIMO combined antenna of this embodiment of the invention.

[0040] Figure 7 This is a graph showing the test results of the voltage standing wave ratio (VSWR) when neither the first nor the second antenna element in a 5G MIMO combined antenna is configured with a first arc angle or a second arc angle.

[0041] Figure 8 This is a graph showing the test results of the voltage standing wave ratio (VSWR) when neither the first nor the second antenna element in a 5G MIMO combined antenna has a first, second, or third notch.

[0042] Figure 9 This is a graph showing the test results of the voltage standing wave ratio (VSWR) of the third radiating part with different widths in the 5G MIMO combined antenna of this invention.

[0043] Figure 10 This is a test result diagram of the isolation between the first antenna element and the second antenna element when the first and second slots are not set in the 5G MIMO combined antenna.

[0044] Figure 11 This is a graph showing the test results of the voltage standing wave ratio (VSWR) of the first and second antenna elements of a 5G MIMO combined antenna without any short-circuit stubs.

[0045] In the figure: 1. Substrate; 2. First antenna element; 3. Second antenna element; 4. Isolation slot; 5. First radiating part; 501. First arc angle; 502. Second arc angle; 6. Second radiating part; 601. First side; 602. Second side; 603. Third side; 604. Fourth side; 605. First notch; 606. Second notch; 607. Third notch; 6071. First extension opening; 6072. Second extension opening; 7. Third radiating part; 8. Feed part; 9. First reference ground; 10. Second reference ground; 11. First gap; 12. Second gap; 13. Short-circuit stub. Detailed Implementation

[0046] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided to make the invention more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore repeated descriptions of them will be omitted.

[0047] The terms used to express position and direction in this invention are illustrated with reference to the accompanying drawings, but changes can be made as needed, and all such changes are included within the scope of protection of this invention.

[0048] See Figures 1 to 3 As shown, the present invention provides a 5G MIMO combined antenna, including: a substrate 1, a first antenna element 2, a second antenna element 3, and an isolation slot 4.

[0049] The substrate 1 has a strip-shaped structure. In this embodiment, it is a cuboid structure with a length of 135-145mm, a width of 45-55mm, and a thickness of 1mm. It is made of FR4 board with a dielectric constant of 4.2 and a loss tangent of 0.02. The overall volume is small and it has insulation and high temperature resistance properties. A conductive layer is provided on one side of the substrate 1. As an example, the conductive layer is a copper-clad layer.

[0050] The first antenna element 2 and the second antenna element 3 have the same structure and both include a first radiating part 5, a second radiating part 6, a third radiating part 7, and a feed part 8. The first radiating part 5, the second radiating part 6, and the third radiating part 7 are connected sequentially and form an inverted "U"-shaped structure above the conductive layer. This structure can be achieved by metal stamping. This design, without reducing the effective radiation area of ​​the antenna, makes full use of space through bending, enabling the miniaturization of the structure of the first antenna element 2 and the second antenna element 3. The feed part 8 is located on the first radiating part 5 and is used to connect to the conductive layer. The first antenna element 2 and the second antenna element 3 work together to cover the 824-960MHz / 1710-7125MHz 5G frequency band, which is all 5G frequency bands (sub-6GHz band) currently used globally except for millimeter waves. It has the advantages of flexible operating frequency band and large network capacity.

[0051] See Figure 1-2 As shown, the first radiating part 5 includes opposing upper and lower sides, and extends downwards. The upper side of the first radiating part 5 of the first antenna unit 2 connects to a portion of the first side 601 of the second radiating part 6, and the upper side of the first radiating part 5 of the second antenna unit 3 connects to a portion of the third side 603 of the second radiating part 6. Since the shape of the first radiating part 5 has a significant impact on the high-frequency performance of the antenna unit, especially the lower side, a first arc angle 501 and a second arc angle 502 are respectively provided on both sides of the lower side of the first radiating part 5, and the radius of the first arc angle 501 is smaller than the radius of the second arc angle 502, which effectively improves the high-frequency performance of the antenna. (See also...) Figure 7 As shown, Figure 7 The results show the voltage standing wave ratio (VSWR) of the first antenna element 2 and the second antenna element 3 in a 5G MIMO combined antenna when neither the first arc angle 501 nor the second arc angle 502 is set. As can be seen from the figure, the first radiating part 5 (which has a rectangular structure) without the first arc angle 501 and the second arc angle 502 will cause the high-frequency VSWR of the antenna element to deteriorate significantly.

[0052] The second radiating section 6 includes opposing first sides 601 and third sides 603, opposing second sides 602 and fourth sides 604, and opposing upper and lower surfaces. The second radiating section 6 is provided with a first notch 605, a second notch 606, and a third notch 607. Specifically, the first notch 605 of the first antenna unit 2 is located on the first side 601 and extends inward; the first notch 605 of the second antenna unit 3 is located on the third side 603 and extends inward; the second notch 606 is located on the second side 602 and extends towards the fourth side 604. When the first notch 605 approaches the first side 601 of the second radiating section 6, the second notch... The second notch 606 is adjacent to the third side 603 of the second radiating part 6. When the first notch 605 is close to the third side 603 of the second radiating part 6, the second notch 606 is adjacent to the first side 601 of the second radiating part 6. The third notch 607 is provided on the fourth side 604. The third notch 607 is L-shaped and includes a first extension port 6071 and a second extension port 6072 connected together. The first extension port 6071 extends from the fourth side 604 of the second radiating part 6 toward the line connecting the second side 602 and the fourth side 604. The second extension port 6072 extends from the line connecting the first side 601 and the third side 603 of the second radiating part 6. The first notch 605, the second notch 606, and the third notch 607 can excite multiple resonant points using the principle of current coupling, generating resonance at high frequencies and thus widening the antenna bandwidth. Furthermore, by adjusting the lengths of the first notch 605, the second notch 606, and the third notch 607, the high-frequency resonant frequency can be adjusted for impedance matching, thereby maximizing the antenna's radiation efficiency at any high frequency. Figure 8 As shown, Figure 8 This is a graph showing the test results of the voltage standing wave ratio (VSWR) when neither the first antenna element 2 nor the second antenna element 3 in a 5G MIMO combined antenna has the first notch 605, the second notch 606, or the third notch 607. The graph shows that omitting the first radiating part 6 (without the first notch 605, the second notch 606, and the third notch 607) leads to a significant deterioration in the high-frequency VSWR of the antenna element, especially in the 1710-2000MHz range.

[0053] The third radiating section 7 includes opposing upper and lower sides. The upper side of the third radiating section 7 of the first antenna element 2 connects to a portion of the third side 603 of the second radiating section 6, and the upper side of the third radiating section 7 of the second antenna element 3 connects to a portion of the first side 601 of the second radiating section 6. The third radiating section 7 extends downward. The function of the third radiating section 7 is to adjust the low-frequency resonant frequency. Specifically, the larger the distance between the upper and lower sides of the third radiating section 7, the lower the low-frequency resonant frequency. By adjusting the low-frequency resonant frequency, impedance matching is achieved, thereby maximizing the antenna's radiation efficiency at any low frequency. See also Figure 9 As shown, Figure 9This is a graph showing the test results of the voltage standing wave ratio (VSWR) of the third radiating part 7 with different widths in the 5G MIMO combined antenna of this invention. As can be seen from the graph, when the distance between the upper and lower sides of the third radiating part 7 (i.e., the width of the third radiating part 7) is increased by 5mm from 13-17mm, the resonant frequency shifts to a lower frequency, and the VSWR of the antenna element deteriorates near 960MHz.

[0054] An isolation seam 4 is positioned near the centerline of the conductive layer along its width. The isolation seam 4 divides the conductive layer into two independent reference grounds: a first reference ground 9 and a second reference ground 10. The first antenna element 2 is disposed on the first reference ground 9, and the second antenna element 3 is disposed on the second reference ground 10. The first antenna element 2 and the second antenna element 3 are arranged symmetrically about the isolation seam 4. The isolation seam 4 divides the conductive layer between the first antenna element 2 and the second antenna element 3 into two equal parts. Its purpose is to reduce the mutual coupling between the first antenna element 2 and the second antenna element 3, thereby improving isolation. More importantly, after the conductive layer is equally divided into two independent parts (i.e., the first reference ground 9 and the second reference ground 10), the first antenna element 2 and the second antenna element 3 will exhibit a certain angle in their low-frequency (824-960MHz) radiation directions. Figure 4 As shown, Figure 4 The diagram shows the radiation pattern of the 5G MIMO combined antenna in this embodiment at 900MHz. As can be seen, the angled arrangement reduces the spatial coupling between the first antenna element 2 and the second antenna element 3, significantly improving isolation. At low frequencies, the isolation between the first antenna element 2 and the second antenna element 3 reaches 15dB, with the closest distance between them being only 30mm (not shown), providing a foundation for antenna miniaturization.

[0055] In one specific embodiment, the lengths of the upper and lower sides of the first radiating part 5 are 27-32 mm, and the distance between the upper and lower sides of the first radiating part 5 is 26-30 mm; the length of the first side 601 of the second radiating part 6 is 48-52 mm, the length of the second side 602 of the second radiating part 6 is 45-49 mm, the length of the third side 603 of the second radiating part 6 is 48-52 mm, and the length of the fourth side 604 of the second radiating part 6 is 49-53 mm; the lengths of the upper and lower sides of the third radiating part 7 are 48-52 mm, and the distance between the upper and lower sides of the third radiating part 7 is 13-17 mm.

[0056] In this embodiment, the length of the upper side of the first radiating part 5 is 29.5 mm, and the length of the lower side of the first radiating part 5 is less than 29.5 mm, specifically determined by the radius of the first arc angle 501 and the second arc angle 502. The distance between the upper and lower sides of the first radiating part 5 is 28 mm. The length of the second side 602 of the second radiating part 6 is 47 mm, and the length of the fourth side 604 of the second radiating part 6 is 51 mm. The length of the first side 601 of the second radiating part 6 of the first antenna unit 2, which connects to the upper side of the first radiating part 5, is 29.5 mm. The length of the third side 603 of the second radiating part 6 of the first antenna unit 2, which connects to the upper side of the third radiating part 7, is 26.5 mm. The length of the third side 603 of the second radiating part 6 of the second antenna unit 3, which connects to the upper side of the first radiating part 5, is 26.5 mm. The length of the first side 601 of the second radiating part 6 of the second antenna unit 3, which connects to the upper side of the third radiating part 7, is 29.5 mm. The upper and lower sides of the third radiating part 7 are both 50mm long, and the distance between the upper and lower sides of the third radiating part 7 is 15mm. This size makes the first antenna element 2 and the second antenna element 3 relatively small, suitable for use in multiple antenna array applications to enhance communication capacity and spectral efficiency, and improve antenna electrical performance.

[0057] In a preferred embodiment, a first gap 11 is provided between the first antenna unit 2 and the isolation gap 4, the first gap 11 is parallel to the isolation gap 4, and the length of the first gap 11 is less than the length of the isolation gap 4; a second gap 12 is provided between the second antenna unit 3 and the isolation gap 4, the second gap 12 is parallel to the isolation gap 4, and the length of the second gap 12 is less than the length of the isolation gap 4.

[0058] The first slot 11 and the second slot 12 can reduce the coupling between the first antenna element 2 and the second antenna element 3 through the conductive layer, further improving the isolation between the first antenna element 2 and the second antenna element 3. Specifically, the length of the first slot 11 is 1 / 2 to 3 / 5 of the length of the isolation slot 4, and the length of the second slot 12 is 1 / 2 to 3 / 5 of the length of the isolation slot 4. This length dimension provides good isolation effect. As an example, the length of the first slot 11 and the second slot 12 is 28 mm. See also Figure 10 As shown, Figure 10 This is a test result diagram of the isolation between the first antenna element 2 and the second antenna element 3 when the first slot 11 and the second slot 12 are not set in the 5G MIMO combined antenna. As can be seen from the figure, the absence of the first slot 11 and the second slot 12 will result in a decrease in the isolation between the first antenna element 2 and the second antenna element 3.

[0059] In a preferred embodiment, both the first antenna element 2 and the second antenna element 3 further include a short-circuit stub 13, which connects to the second side 602 of the second radiating part 6 and extends downward.

[0060] The short-circuit stub 13 can improve the impedance matching performance of the antenna, increase its radiation efficiency, reduce energy reflection on the antenna, maximize radiated power, and thus improve the antenna gain. Specifically, the short-circuit stub 13 of the first antenna element 2 connects to the second side 602 of the second radiating part 6 near the first side 601, and the short-circuit stub 13 of the second antenna element 3 connects to the second side 602 of the second radiating part 6 near the third side 603. The short-circuit stub 13 has a length of 26-30 mm and a width of 5-7 mm. As an example, the short-circuit stub 13 has a length of 28 mm and a width of 6 mm. See also... Figure 11 As shown, Figure 11 This is a graph showing the test results of the voltage standing wave ratio (VSWR) of the first antenna element 2 and the second antenna element 3 in a 5G MIMO combined antenna without the short-circuit stub 13. The graph shows that the first antenna element 2 and the second antenna element 3, without the short-circuit stub 13, exhibit severe low-frequency degradation.

[0061] In one specific embodiment, the first antenna unit 2 and the second antenna unit 3 are located at both ends of the length direction of the substrate 1, respectively. By increasing the spacing, the isolation between the first antenna unit 2 and the second antenna unit 3 can be further improved. The first radiating part 5 of the first antenna unit 2 and the first radiating part 5 of the second antenna unit 3 are arranged facing each other in the same direction. The short-circuit stub 13 of the first antenna unit 2 and the short-circuit stub 13 of the second antenna unit 3 have the same orientation.

[0062] The following is combined Figure 5-6 This describes the test performance of the 5G MIMO combined antenna in this embodiment of the invention. Figure 5 This is a graph showing the voltage standing wave ratio (VSWR) test results of the first antenna element 2 and the second antenna element 3 according to an embodiment of the present invention. Figure 5 It can be seen that the voltage standing wave ratio (VSWR) is ≤3.5 in the range of 824MHz-824MHz, ≤3.0 in the range of 1710MHz-2690MHz, and ≤2.0 in the range of 3300MHz-7125MHz. Figure 6 This is a test result diagram of the isolation between the first antenna element 2 and the second antenna element 3 according to an embodiment of the present invention. Figure 6It can be seen that within the 824MHz-960MHz frequency band, the isolation between the first antenna element 2 and the second antenna element 3 is greater than 15dB; within the 1710MHz-5000MHz frequency band, the isolation between the first antenna element 2 and the second antenna element 3 is greater than 12.5dB; and within the 5.0GHz-7.125GHz frequency band, the isolation between the first antenna element 2 and the second antenna element 3 is greater than 20dB. Since the antenna frequency bands cover the WiFi frequency bands, including 2.4-2.5GHz, 5.15-5.85GHz, and 5.925-7.125GHz, this 5G MIMO combination antenna can also be used as a WiFi 6e antenna.

[0063] In one specific embodiment, the 5G MIMO combined antenna has a length of 135-145mm, a width of 45-55mm, and a height of 23-33mm. Preferably, the 5G MIMO combined antenna has a length of 140mm, a width of 50mm, and a height of 28mm. The entire 5G MIMO combined antenna is compact in size and can cover the 5G frequency bands of 824-960MHz / 1710-7125MHz, making it applicable to various terminals.

[0064] One type of terminal can be a mobile phone, router, etc. This terminal is equipped with the aforementioned 5G MIMO combined antenna, which has the characteristics of small size, good antenna electrical performance, and coverage of the entire 5G frequency band.

[0065] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the invention without departing from the principles and spirit of the invention, and all such changes should fall within the protection scope of the claims of the present invention.

Claims

1. A 5G MIMO combined antenna, characterized in that, include: A substrate, wherein the substrate has a strip-shaped structure and a conductive layer is provided on one side of the substrate; The first antenna unit and the second antenna unit have the same structure and each includes a first radiating part, a second radiating part, a third radiating part and a feed part. The first radiating part, the second radiating part and the third radiating part are connected in sequence and form an inverted "U" shaped structure above the conductive layer. The feed part is disposed on the first radiating part and is used to connect to the conductive layer. An isolation seam is provided near the centerline of the conductive layer in the width direction. The isolation seam is used to divide the conductive layer into an independent first reference ground and a second reference ground. The first antenna element is provided on the first reference ground, and the second antenna element is provided on the second reference ground. The first antenna element and the second antenna element are arranged symmetrically about the isolation seam. The first antenna unit and the second antenna unit both further include a short-circuit stub, which connects to the second side of the second radiating part and extends downward; The second radiating portion includes opposing first and third sides, opposing second and fourth sides, and opposing upper and lower surfaces; The second radiating part is provided with a first notch, a second notch and a third notch. The first notch of the first antenna element is provided on the first side and extends inward. The first notch of the second antenna element is provided on the third side and extends inward. The second notch is provided on the second side and extends to the fourth side. The third notch is provided on the fourth side.

2. The 5G MIMO combined antenna according to claim 1, characterized in that, A first gap is provided between the first antenna element and the isolation seam. The first gap is parallel to the isolation seam, and the length of the first gap is less than the length of the isolation seam. A second gap is provided between the second antenna element and the isolation gap. The second gap is parallel to the isolation gap and the length of the second gap is less than the length of the isolation gap.

3. The 5G MIMO combined antenna according to claim 2, characterized in that, The length of the first gap is 1 / 2 to 3 / 5 of the length of the isolation joint, and the length of the second gap is 1 / 2 to 3 / 5 of the length of the isolation joint.

4. The 5G MIMO combined antenna according to claim 1, characterized in that, The first radiating part includes an upper side and a lower side opposite to each other. A first arc angle and a second arc angle are respectively provided on both sides of the lower side of the first radiating part. The radius of the first arc angle is smaller than the radius of the second arc angle. The upper side of the first radiating part of the first antenna unit is connected to a portion of the first side of the second radiating part. The upper side of the first radiating part of the second antenna unit is connected to a portion of the third side of the second radiating part. The third radiating part includes an upper side and a lower side opposite to each other. The upper side of the third radiating part of the first antenna unit is connected to a portion of the third side of the second radiating part. The upper side of the third radiating part of the second antenna unit is connected to a portion of the first side of the second radiating part. The third radiating part extends downward.

5. The 5G MIMO combined antenna according to claim 4, characterized in that, When the first notch is close to the first side of the second radiating part, the second notch is adjacent to the third side of the second radiating part; When the first notch is close to the third side of the second radiating part, the second notch is adjacent to the first side of the second radiating part; The third notch is L-shaped and includes a first extension opening and a second extension opening connected together. The first extension opening extends from the fourth side of the second radiating part toward the line connecting the second side and the fourth side, and the second extension opening extends from the line connecting the first side and the third side of the second radiating part.

6. The 5G MIMO combined antenna according to claim 4, characterized in that, The lengths of the upper and lower sides of the first radiating part are 27-32 mm, and the distance between the upper and lower sides of the first radiating part is 26-30 mm. The length of the first side of the second radiating part is 48-52mm, the length of the second side of the second radiating part is 45-49mm, the length of the third side of the second radiating part is 48-52mm, and the length of the fourth side of the second radiating part is 49-53mm. The lengths of the upper and lower sides of the third radiating part are 48-52 mm, and the distance between the upper and lower sides of the third radiating part is 13-17 mm.

7. The 5G MIMO combined antenna according to claim 1, characterized in that, The short-circuit stub of the first antenna element is connected to the second side of the second radiating part near the first side, and the short-circuit stub of the second antenna element is connected to the second side of the second radiating part near the third side. The short-circuit stub has a length of 26-30 mm and a width of 5-7 mm.

8. The 5G MIMO combined antenna according to claim 1, characterized in that, The first antenna unit and the second antenna unit are located at opposite ends of the substrate along its length. The first radiating portion of the first antenna unit and the first radiating portion of the second antenna unit are arranged facing each other. The short-circuit stubs of the first antenna unit and the short-circuit stubs of the second antenna unit have the same orientation.

9. The 5G MIMO combined antenna according to claim 1, characterized in that, The 5G MIMO combined antenna has a length of 135-145mm, a width of 45-55mm, and a height of 23-33mm; The first antenna unit and the second antenna unit work together to cover the 5G frequency band of 824-960MHz / 1710-7125MHz.

10. A terminal, characterized in that, The terminal is equipped with a 5G MIMO combined antenna as described in any one of claims 1-9.

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