阅读说明：本技术 耦合馈电宽带mimo天线组件及移动终端 (Coupling feed broadband MIMO antenna assembly and mobile terminal ) 是由 马磊 于 2021-08-26 设计创作，主要内容包括：本发明提供一种耦合馈电宽带MIMO天线组件及移动终端,包括呈矩形的金属地板和围绕所述金属地板边缘设置的介质边框；所述介质边框的每个长边处均设置有2个MIMO天线单元；所述MIMO天线单元包括馈电贴片和耦合带条,所述馈电贴片和所述耦合带条分位于所述介质边框相对的两面。通过在介质边框上设置4MIMO天线单元,使得天线组件在Sub-6G频段范围内有较好的辐射性能；此外,通过将MIMO天线单元中的馈电贴片和耦合带条分设于介质边框相对的两个面,使得两者之间产生较好的耦合,从而拓宽了天线的带宽。解决了如何实现Sub-6G MIMO天线在有限的结构尺寸下的宽频带辐射的问题。(The invention provides a coupling feed broadband MIMO antenna assembly and a mobile terminal, which comprise a rectangular metal floor and a medium frame arranged around the edge of the metal floor; each long edge of the medium frame is provided with 2 MIMO antenna units; the MIMO antenna unit comprises a feed patch and a coupling strip, and the feed patch and the coupling strip are respectively positioned on two opposite sides of the dielectric frame. 4MIMO antenna units are arranged on the medium frame, so that the antenna assembly has better radiation performance within the Sub-6G frequency range; in addition, the feeding patch and the coupling strip in the MIMO antenna unit are respectively arranged on two opposite surfaces of the dielectric frame, so that good coupling is generated between the feeding patch and the coupling strip, and the bandwidth of the antenna is widened. The problem of how to realize broadband radiation of the Sub-6G MIMO antenna under the limited structural size is solved.)

1. A coupling feed broadband MIMO antenna assembly is characterized by comprising a rectangular metal floor and a dielectric frame arranged around the edge of the metal floor; each long edge of the medium frame is provided with 2 MIMO antenna units; the MIMO antenna unit comprises a feed patch and a coupling strip, and the feed patch and the coupling strip are respectively positioned on two opposite sides of the dielectric frame.

2. The coupled feed wideband MIMO antenna assembly of claim 1, wherein the dielectric rim has a dielectric constant of 2.2 and a thickness of 1.52 ± 0.05 mm.

3. The coupled feed wideband MIMO antenna assembly of claim 1, wherein the MIMO antenna elements on the same long side are spaced apart from each other by a distance of 50 ± 5mm, and wherein a MIMO antenna element is spaced apart from an end of the dielectric rim by a distance of 50 ± 5 mm; the MIMO antenna units on the two long sides are symmetrical along the central axis of the metal floor in the length direction.

4. The coupled feed broadband MIMO antenna assembly of claim 1, wherein the feed patch is rectangular, and a feed branch is led out of the feed patch, and a feed point is arranged at the tail end of the feed branch; the coupling strip is in an irregular annular shape and is provided with an opening; the perpendicular projection of the feeding point on the plane of the coupling strip is positioned at the opening.

5. The coupled feed wideband MIMO antenna assembly of claim 4, wherein the feed patch is located inside the dielectric rim.

6. The coupled feed wideband MIMO antenna assembly of claim 4, wherein the coupling strip has a trace width of 0.2 ± 0.05 mm.

7. The coupled-feed wideband MIMO antenna assembly of claim 4, wherein the coupled strips comprise first, second, third and fourth strips in sequence end-to-end with the opening disposed therebetween; the first strip is in a straight shape; the second strip comprises two S-shaped sub-strips which are symmetrically arranged and connected at the ends; the third strip is shaped like a Chinese character 'ji'; the fourth strip is L-shaped.

8. The coupled-feed wideband MIMO antenna assembly of claim 7, wherein the feed patch in perpendicular projection to the plane of the coupling strip is located within the area encompassed by the coupling strip and partially coincident with the third strip.

9. The coupled feed wideband MIMO antenna assembly of claim 8, wherein the feed patch is 3 ± 0.5mm in length and 3 ± 0.5mm in width; the whole length of the coupling strip is 7 +/-0.5 mm, and the width of the coupling strip is 6.5 +/-0.5 mm.

10. A mobile terminal comprising a coupled feed wideband MIMO antenna assembly according to any one of claims 1 to 9.

Technical Field

The invention relates to the technical field of wireless communication, in particular to a coupling feed broadband MIMO antenna assembly and a mobile terminal.

Background

Currently, in order to improve the wireless communication level of a mobile terminal, antennas are generally designed as MIMO. MIMO, refers to the simultaneous operation of two or more co-frequency antennas. Generally speaking, a plurality of co-frequency antennas of the MIMO antenna have the same antenna structure, so that the generated co-frequency efficiency has a multiplication effect, thereby improving the transceiving performance of the antenna.

Currently, with the development of 5G communication technology, Sub-6GHz antennas are heavily studied, and 3GPP defines two FRs (frequency ranges) used by 5 GNRs, wherein FR1 includes a part of frequency bands used by 2/3/4G, and a part of frequency bands are newly added, the frequency range of the newly added frequency band is defined as 450-6000 MHz, and the newly added frequency band is generally called Sub-6G because the radio frequency spectrum is below 6G.

Currently, a Sub-6GHz antenna is usually designed in a MIMO antenna mode, and the key of the design lies in how to realize broadband radiation under a limited structural size, while a common MIMO antenna structure at least needs 4MIMO antenna units and also needs array arrangement, which not only occupies a large space, but also causes poor isolation among the antenna units, and in addition, the existing MIMO antenna structure has a narrow bandwidth and cannot meet the communication broadband radiation requirement of Sub-6G, so that no better scheme is provided for realizing broadband radiation of the Sub-6GMIMO antenna under the limited structural size.

Disclosure of Invention

The invention aims to provide a coupling feed broadband MIMO antenna component and a mobile terminal, so as to solve the problem of realizing broadband radiation of a Sub-6G MIMO antenna under a limited structural size.

In order to solve the technical problem, the invention provides a coupling feed broadband MIMO antenna assembly, which comprises a rectangular metal floor and a medium frame arranged around the edge of the metal floor; each long edge of the medium frame is provided with 2 MIMO antenna units; the MIMO antenna unit comprises a feed patch and a coupling strip, and the feed patch and the coupling strip are respectively positioned on two opposite sides of the dielectric frame.

Optionally, in the coupled-feed wideband MIMO antenna assembly, the dielectric constant of the dielectric rim is 2.2, and the thickness of the dielectric rim is 1.52 ± 0.05 mm.

Optionally, in the coupled feed broadband MIMO antenna assembly, a distance between the MIMO antenna elements on the same long side is 50 ± 5mm, and a distance between one of the MIMO antenna elements and an end point of the dielectric frame is 50 ± 5 mm; the MIMO antenna units on the two long sides are symmetrical along the central axis of the metal floor in the length direction.

Optionally, in the coupled feed broadband MIMO antenna assembly, the feed patch is rectangular, a feed branch is led out from the feed patch, and a feed point is arranged at the end of the feed branch; the coupling strip is in an irregular annular shape and is provided with an opening; the perpendicular projection of the feeding point on the plane of the coupling strip is positioned at the opening.

Optionally, in the coupled-feed wideband MIMO antenna assembly, the feed patch is located inside the dielectric rim.

Optionally, in the coupled feed broadband MIMO antenna assembly, a trace width of the coupling strip is 0.2 ± 0.05 mm.

Optionally, in the coupled-feed wideband MIMO antenna assembly, the coupling strip includes a first strip, a second strip, a third strip and a fourth strip that are sequentially connected end to end, and the opening is disposed between the first strip and the fourth strip; the first strip is in a straight shape; the second strip comprises two S-shaped sub-strips which are symmetrically arranged and connected at the ends; the third strip is shaped like a Chinese character 'ji'; the fourth strip is L-shaped.

Optionally, in the coupled-feed wideband MIMO antenna assembly, a perpendicular projection of the feed patch to a plane of the coupling strip is located in an area surrounded by the coupling strip and partially coincides with the third strip.

Optionally, in the coupled feed broadband MIMO antenna assembly, the feed patch has a length of 3 ± 0.5mm and a width of 3 ± 0.5 mm; the whole length of the coupling strip is 7 +/-0.5 mm, and the width of the coupling strip is 6.5 +/-0.5 mm.

To solve the above technical problem, the present invention further provides a mobile terminal including the coupled feed wideband MIMO antenna assembly as described in any one of the above.

The invention provides a coupling feed broadband MIMO antenna assembly and a mobile terminal, which comprise a rectangular metal floor and a medium frame arranged around the edge of the metal floor; each long edge of the medium frame is provided with 2 MIMO antenna units; the MIMO antenna unit comprises a feed patch and a coupling strip, and the feed patch and the coupling strip are respectively positioned on two opposite sides of the dielectric frame. 4MIMO antenna units are arranged on the medium frame, so that the antenna assembly has better radiation performance within the Sub-6G frequency range; in addition, the feeding patch and the coupling strip in the MIMO antenna unit are respectively arranged on two opposite surfaces of the dielectric frame, so that good coupling is generated between the feeding patch and the coupling strip, and the bandwidth of the antenna is widened. The problem of how to realize broadband radiation of the Sub-6G MIMO antenna under the limited structural size is solved.

Drawings

Fig. 1 is a schematic structural diagram of a coupled feed broadband MIMO antenna assembly provided in this embodiment;

fig. 2 is a schematic structural diagram of a MIMO antenna unit with reference to structure 1 provided in this embodiment;

fig. 3 is a schematic structural diagram of a MIMO antenna unit with reference to structure 2 provided in this embodiment;

fig. 4 is a schematic structural diagram of a MIMO antenna unit provided in this embodiment;

fig. 5 is an equivalent circuit diagram of a MIMO antenna unit provided in the present embodiment;

fig. 6 is a schematic size diagram of a MIMO antenna unit provided in this embodiment;

fig. 7 is a diagram of a simulation result of S-parameters of the coupled feed broadband MIMO antenna assembly provided in this embodiment;

wherein the reference numerals are as follows:

100-metal floor; 200-a media border; 300-MIMO antenna elements; 310-a feed patch; 311-feeding point; 320-a coupling strap; 321-a first strip; 322-a second tape strip; 323-third strip; 324-fourth strap.

Detailed Description

The coupled feed broadband MIMO antenna assembly and the mobile terminal according to the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention. Further, the structures illustrated in the drawings are often part of actual structures. In particular, the drawings may have different emphasis points and may sometimes be scaled differently.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the accompanying drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order, and it is to be understood that such structures as are used are interchangeable where appropriate. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

The embodiment provides a coupled feed broadband MIMO antenna assembly, as shown in fig. 1 to 4, including a rectangular metal floor 100 and a dielectric frame 200 disposed around an edge of the metal floor 100; each long side of the dielectric frame 200 is provided with 2 MIMO antenna units 300; the MIMO antenna unit 300 includes a feeding patch 310 and a coupling strip 320, and the feeding patch 310 and the coupling strip 320 are respectively located on two opposite sides of the dielectric bezel 200.

According to the coupled feed broadband MIMO antenna assembly provided by the embodiment, the 4MIMO antenna units are arranged on the medium frame, so that the antenna assembly has better radiation performance within the Sub-6G frequency range; in addition, the feeding patch and the coupling strip in the MIMO antenna unit are respectively arranged on two opposite surfaces of the dielectric frame, so that good coupling is generated between the feeding patch and the coupling strip, and the bandwidth of the antenna is widened. The problem of how to realize broadband radiation of the Sub-6G MIMO antenna under the limited structural size is solved.

Preferably, in this embodiment, the dielectric constant of the dielectric frame 200 is 2.2, and the thickness of the dielectric frame 200 is 1.52 ± 0.05 mm. The distance between the MIMO antenna units 300 on the same long side is 50 ± 5mm, and the distance between one MIMO antenna unit 300 and one end point of the dielectric frame 200 is 50 ± 5 mm; the two MIMO antenna units 300 on the long side are symmetrical along the central axis of the metal floor 100 in the length direction.

The MIMO antenna units 300 are symmetrically disposed on the dielectric frame 200, so that the spatial isolation and port isolation between the MIMO antenna units 300 can be improved to the maximum. If the distance between the MIMO antenna elements 300 is limited to 50 ± 5mm, the isolation between the MIMO antenna elements 300 can be ensured to be 20dB or more.

Further, in this embodiment, the feed patch 310 is rectangular, a feed branch is led out from the feed patch 310, and a feed point 311 is disposed at the end of the feed branch; the coupling strap 320 is in the shape of an irregular ring and has an opening; the perpendicular projection of the feed point 311 in the plane of the coupling strip 320 is located at the opening.

Preferably, in this embodiment, the feeding patches 310 are located on the inner side of the dielectric frame 200, that is, inside the space surrounded by the dielectric frame 200, so that the feeding patches 310 on the two long sides of the dielectric frame 200 are disposed oppositely. Thus, feeding of the motherboard to the feeding point 311 is facilitated.

In this embodiment, the trace width of the coupling strip 320 is 0.2 ± 0.05 mm.

Specifically, in the present embodiment, three types of routing patterns of the coupling strip 320 are provided, as shown in fig. 2 to 4.

Fig. 2 shows a reference structure 1 of a coupling band 320, which includes a first band, a second band and a third band connected in sequence in a clockwise direction; the first strip and the third strip are L-shaped, and an opening is formed between the first strip and the third strip; the second strip is in the shape of a Chinese character 'ji'. The perpendicular projection of the feed patch 310 in the plane of the coupling strip 320 is located in the area enclosed by the coupling strip 320 and coincides with the second strip portion, in particular, the apex portion of the zigzag shape.

By adding the second strip in a zigzag shape, the coupling efficiency between the coupling strip 320 and the feed patch 310 is improved, and particularly, a resonant mode can be generated at 3.3 GHz.

FIG. 3 shows a reference structure 2 of a coupling strap 320, which includes a first strap, a second strap and a third strap connected in sequence in a clockwise direction; an opening exists between the first strap and the third strap; the first strip is in a straight shape; the second strip comprises two S-shaped sub-strips which are symmetrically arranged and connected at the ends; the third strip is C-shaped. The perpendicular projection of the feed patch 310 on the plane of the coupling strip 320 is located within the area enclosed by the coupling strip 320.

By adding the second strip, the coupling efficiency between the coupling strip 320 and the feeding patch 310 is improved, and particularly, a resonant mode can be generated at 3.8 GHz.

Fig. 4 shows the resulting coupling strap 320 structure that combines the reference structure 1 (shown in fig. 2) and the reference structure 2 (shown in fig. 3). The coupling strip 320 comprises a first strip 321, a second strip 322, a third strip 323 and a fourth strip 324 which are connected end to end in sequence, and the opening is arranged between the first strip 321 and the fourth strip 324; the first strap 321 is in a straight shape; the second strap 322 comprises two S-shaped sub-straps which are symmetrically arranged and connected at the ends; the third strip 323 is in a zigzag shape; the fourth strap 324 is L-shaped. The perpendicular projection of the feed patch 310 to the plane of the coupling strip 320 is located within the area enclosed by the coupling strip 320 and partly coincides with the third strip 323.

Therefore, the coupling efficiency between the coupling strip 320 and the feed patch 310 is improved, specifically, the S11 parameter is less than-10 dB in the bandwidth range of 3.2-4.2 GHz, and the design of wide bandwidth is realized.

Preferably, in the MIMO antenna unit shown in fig. 2, 3 and 4, the traces of the MIMO antenna unit are rectangular overall, the included angle between each strip and the adjacent strip is 90 °, and the trace width of the coupling strip 320 is about 0.2 mm. In the rectangular ring surrounded by the coupling strip 320, a rectangular feeding patch 310 is disposed, and the feeding patch 310 and the coupling strip 320 are respectively located at two sides of the dielectric rim 200 to implement coupling feeding of the coupling strip 320.

Compared to the MIMO antenna units shown in fig. 2 and 3, the MIMO antenna unit shown in fig. 4 is a better antenna unit trace. The MIMO antenna unit shown in fig. 4 includes a part of the folded-line-shaped traces of the MIMO antenna unit shown in fig. 2 and 3, so that the coupling efficiency of the antenna can be effectively improved, and the bandwidth of the antenna can be improved.

Fig. 5 is an equivalent circuit diagram corresponding to the MIMO antenna unit structure shown in fig. 4. Due to the presence of the second strip 322 and the third strip 323 of the coupling strip 320, two sets of LC parallel parameters can be equivalent. The specific parameters are not described here, but may vary depending on the actual dimensions. As can be seen from the equivalent circuit diagram, the MIMO antenna unit provided by this embodiment can generate more tuning modes than a common MIMO antenna, thereby facilitating bandwidth widening.

It should be noted that, in the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, similar parts between the embodiments may be referred to each other, and different parts between the embodiments may also be used in combination with each other, which is not limited by the present invention.

The embodiment also provides a mobile terminal, which includes the coupled feed broadband MIMO antenna assembly described in the embodiment. The mobile terminal includes, but is not limited to, a mobile phone, a notebook computer, a tablet computer, etc.

In practical application, two MIMO antenna units may be disposed on each long side of the media frame of the mobile terminal, so as to form a 4MIMO antenna assembly. Preferably, the MIMO antenna units on the two long edges are symmetrically arranged, so that the overall radiation performance of the antenna assembly is improved.

And the feed patch of the MIMO antenna unit is arranged close to the inside of the medium frame, and the feed point at the tail part of the MIMO antenna unit is connected with the corresponding position of the mainboard of the mobile terminal. In order to realize the synchronous feeding of each MIMO antenna unit, the feeding point of each MIMO antenna unit can be connected to the same feeding spring of the main board, that is, only one feeding rf circuit is designed on the main board. Specifically, the feeding point can be welded with the feeding elastic sheet of the main board through a plurality of coaxial cables.

This method is suitable for the case that the inner space of the mobile terminal is small. Under the condition of large internal space like a notebook computer, a corresponding feed radio frequency circuit can be designed for each MIMO antenna unit, so that the connection of a coaxial cable can be omitted, and a feed point can be directly contacted with a feed elastic sheet. Because the connection of the coaxial cable is reduced, the loss of current on the coaxial cable can be reduced, the radiation performance of the antenna is improved, the assembly complexity in the mobile terminal can be reduced, and therefore the assembly efficiency is higher, and the stability of the assembled product is better.

Of course, in the design of the feed radio frequency circuit, other matching circuits such as an LC circuit may be further enhanced, so as to perform better tuning on the MIMO antenna unit, thereby adapting to different mobile terminals.

Besides the arrangement of the MIMO antenna units in the embodiment, the specific arrangement may be tuned according to actual situations, so as to form other forms of 4MIMO antenna assemblies or 8MIMO antenna assemblies. It should be noted that other MIMO antenna element arrangements, layouts, etc. without departing from the spirit of the present invention are also within the scope of the present invention.

Furthermore, as will be understood by those skilled in the art, the specific size, relative position, etc. of the coupling strip and the feeding patch may be different depending on the frequency band range generated by the antenna, so that in practical applications, the coupling strip and the feeding patch need to be tuned and optimized according to practical situations. It should be noted that the specific size range given in the embodiment is a preferred size range, but the scope of the present invention is not limited thereto.

In the following, referring to fig. 1, fig. 4 and fig. 6, a coupled feed broadband MIMO antenna assembly provided by the present invention is described in a specific embodiment.

In this embodiment, a PCB with a dielectric constant of 2.2 is used as the dielectric frame 200, and the thickness thereof is 1.52 mm. Two long sides of the dielectric frame 200 are respectively provided with a pair of MIMO antenna units 300, the MIMO antenna units 300 on each side are spaced by 50mm, and the distance from the short side of the same-side dielectric frame 200 is also 50 mm.

The feed patch 310 of the MIMO antenna unit 300 is located inside the dielectric rim 200 and the coupling strip 320 is located outside. The trace width of the coupling strip 320 is 0.2mm, and the coupling strip comprises a first strip 321, a second strip 322, a third strip 323 and a fourth strip 324 which are connected end to end in sequence, and the opening is arranged between the first strip 321 and the fourth strip 324; the first strap 321 is in a straight shape; the second strap 322 comprises two S-shaped sub-straps which are symmetrically arranged and connected at the ends; the third strip 323 is in a zigzag shape; the fourth strap 324 is L-shaped.

In particular, the first strip 321 has a length of 2.5 mm; the 5 lengths of the S-shaped sub-strips in the second strip 323 are 3mm (3.5mm), 1mm, 1.5mm and 2mm, respectively, wherein the length of the section connected to the first strip 321 is 3mm and the length of the section connected to the third strip 323 is 3.5 mm; in 5 sections of the third strip 232, the lengths of three sections in the horizontal direction are respectively 4.5mm, 1.5mm and 1mm in sequence, the lengths of the two sections in the vertical direction are the same, and the coupling efficiency with the feed patch 310 can be adjusted by adjusting the lengths according to the specific position of the feed patch 310; the fourth strap 324 is 6.5mm in length and 2.2mm in width.

The first tape strip 321, the second tape strip 322, the third tape strip 323, and the fourth tape strip 324 are bent at the joint, and the bending angle is 90 °, and the angles of the corners of the second tape strip 322 and the third tape strip 323 are also 90 °.

And the size of the feeding patch 310 is 3mm × 3mm, the feeding branch extends out 2mm from the corner of the feeding patch 310 near the side of the opening, and a feeding point 311 is provided at the end.

The coupling feed broadband MIMO antenna component with the structure is subjected to simulation test, and the obtained S parameter is shown in figure 7. Fig. 7 also shows a simulation result of S parameters of the coupled feeding broadband MIMO antenna assembly corresponding to the MIMO antenna unit structures shown in fig. 2 and fig. 3, and it can be found through comparison that the coupled feeding broadband MIMO antenna assembly provided by this embodiment can cover 3.2 to 4.2GHz, and S11 parameters are all less than-10 dB in the bandwidth range, so that the coupled feeding broadband MIMO antenna assembly has better radiation performance.

In summary, the coupled feed broadband MIMO antenna assembly and the mobile terminal provided in this embodiment include a rectangular metal floor and a dielectric frame disposed around an edge of the metal floor; each long edge of the medium frame is provided with 2 MIMO antenna units; the MIMO antenna unit comprises a feed patch and a coupling strip, and the feed patch and the coupling strip are respectively positioned on two opposite sides of the dielectric frame. 4MIMO antenna units are arranged on the medium frame, so that the antenna assembly has better radiation performance within the Sub-6G frequency range; in addition, the feeding patch and the coupling strip in the MIMO antenna unit are respectively arranged on two opposite surfaces of the dielectric frame, so that good coupling is generated between the feeding patch and the coupling strip, and the bandwidth of the antenna is widened. The problem of how to realize broadband radiation of the Sub-6G MIMO antenna under the limited structural size is solved.

The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.