WO2022204917A1

WO2022204917A1 - Coupled antenna assembly and mobile terminal

Info

Publication number: WO2022204917A1
Application number: PCT/CN2021/083841
Authority: WO
Inventors: 庄德浩; 林裕敏; 李新清; 刘武军; 高其珍
Original assignee: 海能达通信股份有限公司
Priority date: 2021-03-30
Filing date: 2021-03-30
Publication date: 2022-10-06

Abstract

The present application discloses a coupled antenna assembly and a mobile terminal. The coupled antenna assembly comprises: a first metal antenna, which comprises a first coupling region; and a second metal antenna, which comprises a second coupling region. The first coupling region and the second coupling region are stacked with one another, and a gap is provided between the first coupling region and the second coupling region. By using the described means, the present application can solve the problem in the existing technology of antenna arrangement being limited to the region of an antenna support region, achieving antenna wiring area expansion, improving the performance of antennas, and achieving the coverage of low-frequency bands and the improvement of antenna efficiency in the same frequency band.

Description

A coupling antenna assembly and mobile terminal

technical field

The present application relates to the field of wireless communication technologies, and in particular, to a coupled antenna assembly and a mobile terminal.

Background technique

With the vigorous development of wireless communication technology and the large-scale deployment of the Internet of Things, a new era of 5G communication is coming. The 5G communication system, with its features of high speed, large capacity, and low latency, meets people's needs for ultra-large network traffic connections, ultra-multi-device connections, and ultra-high mobility. However, with the gradual approach of 5G communication network, more antennas need to be arranged in mobile terminals to meet the needs of 5G communication, which puts forward higher requirements for the antenna arrangement in mobile terminals in the increasingly harsh broadband antenna environment. Due to the increase of the number of antennas and the too small environment size of each antenna in the mobile terminal, it is difficult to guarantee the performance of the antenna.

The existing built-in antennas mainly adopt the LDS (laser direct structuring) scheme, the FPC (flexible circuit board technology) scheme, and the metal frame scheme. Basically, only one of the LDS and FPC solutions can be selected for the same antenna. The LDS antenna has a high cost, and the consistency of the FPC antenna is poor, and both have the problem that the antenna routing area is limited by the antenna bracket area. It is difficult to realize the expansion of the antenna trace area. With the current increase in the number of terminal antennas and the prevalence of full-screen screens, the size of the antenna environment is getting smaller and smaller, and the shortcomings of the prior art are becoming more and more obvious.

SUMMARY OF THE INVENTION

The main technical problem to be solved by this application is to provide a coupled antenna assembly and a mobile terminal, which solve the problem that the prior art is limited by the area of the antenna bracket, and can realize the expansion of the antenna wiring area under the same antenna environment size, and improve the antenna It can achieve the coverage of low-frequency signals and improve the antenna efficiency in the same frequency band.

In order to solve the above technical problem, a technical solution adopted in the present application is to provide a coupling antenna assembly, comprising: a first metal antenna including a first coupling area; a second metal antenna including a second coupling area; wherein, the The first coupling region and the second coupling region are stacked on each other, and a gap is provided between the first coupling region and the second coupling region.

Wherein, the second metal antenna further includes an extension region located outside the first coupling region, and at least one first end of the second coupling region in the extension direction of its length is correspondingly connected with one of the extension regions.

Wherein, the coupling antenna assembly further includes: a ground terminal, wherein one of the expansion regions is provided with a metal surface corresponding to the position of the ground terminal, and the ground terminal is in electrical contact with the metal surface.

Wherein, in the direction away from the first end portion, one of the expansion regions includes a main body portion and a second end portion that are connected to each other in sequence; The part of the free end adjacent to the groove is bent along the plane where the bottom of the groove is located; wherein, the ground terminal is located on the part of the free end.

Wherein, the second coupling region includes a plurality of coupling sub-regions arranged side by side and spaced apart, and the two coupling sub-regions are stacked with the first coupling region.

Wherein, the plurality of coupling sub-regions are arranged symmetrically with respect to the central axis of the first coupling region.

Wherein, the second coupling region includes two coupling sub-regions arranged side by side and spaced apart, and the two coupling sub-regions are arranged symmetrically with respect to the central axis of the first coupling region.

Wherein, in the stacking direction perpendicular to the first coupling region and the second coupling region, an extension region is connected to one side of the first coupling region, and the plane where the extension region is located is connected to the stacking region. The directions are parallel to each other.

Wherein, the insulating support of the first metal antenna is provided at the gap.

Wherein, the first coupling region and the second coupling region are U-shaped, elongated, square, in-line or L-shaped.

Wherein, the first metal antenna and the second metal antenna are any one of an LDS antenna, an FPC antenna and a metal frame antenna.

Wherein, the range of the gap is 0.2 mm to 3 mm.

In order to solve the above technical problem, another technical solution adopted in the present application is to provide a mobile terminal to realize the coupling antenna assembly described in any one of the above embodiments.

Wherein, the mobile terminal further includes: a frame; wherein, the second metal antenna is close to the frame relative to the first metal antenna.

Wherein, the mobile terminal further includes: a circuit board disposed below the coupling antenna assembly and electrically connected to the first metal antenna.

Different from the situation in the prior art, the beneficial effect of the present application is that a coupling antenna assembly and a mobile terminal are provided in the present application. The coupled antenna assembly includes a first metal antenna and a second metal antenna, wherein the first metal antenna includes a first coupling region, the second metal antenna includes a second coupling region, the first coupling region and the second coupling region are stacked on each other, and the two There is a gap between them. Through the above-mentioned design scheme, the coupling areas of the two metal antennas form an antenna together through surface coupling, which solves the problem that the prior art is limited by the area of the antenna support, and expands the routing of the antenna under the same antenna environment size. Due to the increase in the routing area, the extended antenna has also improved the antenna performance, which can achieve low-frequency coverage and improve the antenna efficiency in the same frequency band. At the same time, a gap is set between the two coupling areas to ensure that there is no electrical contact between the antennas, but the conduction of electrical energy is carried out by means of coupling and feeding. The coupling capacitance formed by the surface coupling makes the antenna easier to cover low frequencies.

【Description of drawings】

In order to illustrate the technical solutions in the embodiments of the present application more clearly, the following briefly introduces the drawings that are used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, under the premise of no creative work, other drawings can also be obtained from these drawings, wherein:

FIG. 1 is a schematic structural diagram of an embodiment of the coupling antenna assembly of the present application;

FIG. 2 is a schematic diagram of an exploded structure of an embodiment of the coupling antenna assembly in FIG. 1;

Fig. 3 is the test result diagram of the frequency and efficiency of the coupling antenna assembly of the present application;

FIG. 4 is a schematic structural diagram of an embodiment of the expansion area in FIG. 1;

FIG. 5 is a schematic structural diagram of an embodiment of a mobile terminal of the present application.

【Detailed ways】

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of this application.

Please refer to FIG. 1 and FIG. 2 together. FIG. 1 is a schematic structural diagram of an embodiment of the coupling antenna assembly of the present application, and FIG. 2 is a schematic diagram of an exploded structure of an embodiment of the coupling antenna assembly in FIG. 1 . The coupled antenna assembly 100 includes a first metal antenna 10 and a second metal antenna 20 , wherein the first metal antenna 10 includes a first coupling region 102 , and the second metal antenna 20 includes a second coupling region 202 . The first coupling region 102 and the second coupling region 202 are stacked on each other, and a gap 30 is provided between the first coupling region 102 and the second coupling region 202 . Specifically, the first metal antenna 10 is an LDS antenna, and the second metal antenna 20 is an FPC antenna. Of course, in other embodiments, the first metal antenna 10 and the second metal antenna 20 may also be any one of an LDS antenna, an FPC antenna, and a metal frame antenna. The metal antenna 20 is a metal frame antenna, or the first metal antenna 10 is an LDS antenna, and the second metal antenna 20 is a metal frame antenna. As long as the two metal antennas can form two coupling regions arranged on top of each other, the two coupling surfaces corresponding to the two coupling regions are arranged opposite to each other with a gap 30 left between them. Regarding the relative positions of the two coupling regions, the second coupling region 202 may be located outside the first coupling region 102, or may be located inside the first coupling region 102, or the two coupling regions may be set in other relative positional relationships, As long as a sufficient coupling effect can be formed, the present invention is not limited thereto. Preferably, the size of the gap 30 is set to 0.2˜3 mm, for example, the gap 30 is 0.2 mm, 0.8 mm, 1 mm, 1.7 mm, 2 mm, 2.5 mm or 3 mm. In addition, if the gap 30 exceeds 3 mm, although no electrical contact can also be achieved, the coupling effect between the two antennas will be different to some extent. Through the above embodiment, the LDS antenna in the first coupling area 102 and the FPC antenna in the second coupling area 202 are stacked on each other with a gap 30 left, and the two are coupled and fed by surface coupling, which can solve the problem of existing problems. In the prior art, the antenna is limited by the area of the antenna bracket, so that the antenna wiring area can be expanded under the same antenna environment size. The coverage of frequency band signals and the improvement of antenna efficiency in the same frequency band. The formation of a coupling capacitance between the two oppositely arranged metal antennas enables the antennas to more easily achieve coverage of low-frequency signals.

In one embodiment, under the condition of the same antenna environment size, the traditional antenna arrangement scheme and the above-mentioned coupling antenna component scheme are respectively tested for antenna frequency and efficiency. The test results are shown in FIG. 3 . Compared with the low frequency resonance point of 890MHz that can be covered by the traditional solution, the coupled antenna component after surface coupling achieves the coverage of the lower frequency point, the low frequency resonance point is extended to 690MHz, and the efficiency is as high as 35%, which effectively improves the performance of the antenna and meets the The performance requirements of the antenna in practical applications.

Further, please refer to FIG. 1 , the insulating support 104 of the first metal antenna 10 is disposed at the gap 30 . Since the LDS antenna uses the laser direct molding technology to endow the ordinary plastic components or circuit boards with electrical interconnection functions, plastic housing support, protection functions, and the antenna function is generated by combining mechanical entities with conductive patterns, the metal antenna is arranged on the antenna insulating bracket. The interior of 104 is at a certain distance from the housing of the insulating bracket 104, so the insulating bracket 104 is arranged at the gap 30 to replace the role of the gap 30, so that the first metal antenna 10 and the second metal antenna 20 will not be connected. Electrical contact occurs, thus avoiding the risk of poor contact between the antennas due to mutual contact. In addition, the outer layer of the second metal antenna 20 , namely the FPC antenna, is wrapped with an insulating layer, and the FPC antenna can be directly attached to the surface of the insulating support 104 of the LDS antenna. The insulating layer can also replace the role of the gap 30 . Therefore, under the double protection of the insulating support 104 and the insulating layer, the second metal antenna 20 can be directly attached to the surface of the insulating support 104 to couple and feed with the first metal antenna 10 . Through the above embodiment, the insulating support 104 prevents electrical contact between the two antennas, instead of the effect of the gap 30, which can further ensure that there is no risk of poor contact between the two antennas.

Of course, in other embodiments, the gap 30 may also be provided with other insulators to replace the role of the gap 30 . For example, an insulating layer is plated on the surface of the metal antenna, or an insulating layer is added between the two metal antennas and the insulating layer is placed at the gap 30, etc., as long as it is ensured that there is no direct electrical contact between the two metal antennas, Instead, the conduction of electrical energy can be carried out by means of coupling feeding.

In this embodiment, please continue to refer to FIG. 1 , the second metal antenna 20 further includes an extension region 204 located outside the first coupling region 102 , and at least one first end 2021 of the second coupling region 202 in the extension direction X of its length There is an extension area 204 corresponding to the connection. Through the above-mentioned embodiments, the routing area of the antenna can be further expanded.

In one embodiment, the length of the extension area 204 can be arbitrarily adjusted under a certain antenna environment size, and the longer the extension antenna length of the extension area 204 is, the lower the frequency that can be covered. In an application scenario, the length of the above-mentioned extension area 204 is further extended, and the frequency test is performed on the extended coupling extension area, so that the coverage of the low frequency point of 450 MHz can be achieved.

Of course, in other embodiments, the second metal antenna 20 may include only one extension region 204 connected in the length extension direction X of one end of the second coupling region 202 , or include a plurality of extension regions connected to a plurality of first ends 2021 204. Obviously, the more extension areas connected, the larger the corresponding antenna extension area, and the more the number of antennas that can be arranged. The size of the extension area should be determined according to the actual number of antennas arranged and the size of the antenna environment, as long as the expansion of the antenna wiring area and the improvement of the antenna performance can be realized on the basis of the original first metal antenna 10 .

In this embodiment, please refer to FIG. 1 , the coupled antenna assembly 100 further includes a ground terminal 40 , wherein a metal surface 402 is provided at a position corresponding to the ground terminal in one of the extension regions 204 , and the ground terminal 40 is in electrical contact with the metal surface 402 . The ground terminal 40 is used to switch the grounding state of the antenna wiring part of the extension area 204 , and specifically whether to ground or not is selected according to the actual debugging state of the antenna. Through the above embodiment, the resonance form of the newly added extension area 204 can be flexibly selected, and the reconfigurable antenna can be intelligently tuned in the extension area.

Of course, in other embodiments, the ground terminal 40 may not be added to the extension area 204, so as to realize the suspension of the antenna wiring part of the extension area 204. This embodiment only changes the resonance form of the antenna during the optimization and debugging process, and does not affect the The surface coupling effect between the two metal antennas has no effect.

In this embodiment, please refer to FIG. 4 , which is a schematic structural diagram of an embodiment of the extension area in FIG. 1 . The expansion area 204 includes a main body portion 2041 and a second end portion 2042 that are connected to each other in sequence; a non-penetrating groove 2043 is provided between the main body portion 2041 and the second end portion 2042 , and a partial area of the free end 2044 adjacent to the groove 2043 Bend along the plane where the bottom of the groove 2043 is located; wherein, the ground terminal 40 is located on a partial area of the free end 2044 . In this embodiment, the ground terminal 40 is disposed at the bent free end 2044 to ensure that the space environment can be fully utilized, and the positions of the metal antenna and the ground terminal 40 can be reasonably arranged under the limited antenna environment size.

In this embodiment, the second coupling region 202 includes a plurality of coupling sub-regions arranged side by side and spaced apart, and the plurality of coupling sub-regions are stacked with the first coupling region 102 . The number of coupling sub-regions may be multiple, such as two, three, four, etc. In other embodiments, the second coupling sub-region 202 may also include only one coupling sub-region, which is specifically set according to actual needs. The present invention is not limited to this. Regarding the positional relationship of the coupling regions, the plurality of coupling sub-regions may be arranged at intervals, or may not be arranged at intervals, or may include a plurality of coupling sub-regions arranged at intervals and symmetrically arranged with respect to the central axis of the first coupling region 102, etc. The size of the coupling area between the sub-region and the first coupling region 102 and the positional relationship of the coupling region are not specifically limited here, as long as the coupling area between the two is sufficient to conduct electrical energy and achieve a certain coupling effect.

In this embodiment, please refer to FIG. 1 , the second coupling region 202 includes two

coupling sub-regions

2022 and 2024 arranged side by side and spaced apart, and the two

coupling sub-regions

2022 and 2024 are arranged symmetrically with respect to the central axis of the first coupling region 102 . Through the above-mentioned embodiments, not only can the requirements of metal antenna structure design be met, but also the routing area of the extended antenna can be further increased.

In this embodiment, please refer to FIG. 2 , in the stacking direction Y perpendicular to the first coupling region 102 and the second coupling region 202 , one side of the first coupling region 102 is connected to an extension region 103 , and the extension region 103 The plane on which it is located is parallel to the lamination direction Y. Through the above-mentioned embodiments, not only the routing area of the original first metal antenna 10 can be expanded under the limited antenna environment size, but also the coupling area of the first coupling region 102 can be expanded, thereby effectively improving the coupling effect.

In another embodiment, please continue to refer to FIG. 2 , the first coupling region 102 and the second coupling region 202 are U-shaped. Through the above-mentioned embodiments, on the one hand, it can ensure that the two antennas have enough area for surface coupling, and on the other hand, it can meet the requirements of product structure design and meet the antenna environment size. Of course, in other embodiments, the shape presented by the coupling region may also be a strip, a square, a straight line or an L shape, etc., as long as the effect of electric energy transfer between the two metal antennas can be ensured.

In addition, the coupling antenna assembly mentioned in the above embodiments can be sold separately, and can also be integrated into a mobile terminal for sale. The mobile terminal can also include other necessary structures, such as a frame, a circuit board, and a ground terminal. In addition, the above-mentioned mobile terminal may be a smart phone, a walkie-talkie, a dual-mode terminal or a tablet computer or the like.

Further, please refer to FIG. 5 , which is a schematic structural diagram of an embodiment of the mobile terminal of the present application. The mobile terminal 200 includes, in addition to the coupling antenna assembly 100 mentioned in the above embodiments, a frame 50 , wherein the second metal antenna 20 is close to the frame 50 relative to the first metal antenna 10 . The mobile terminal further includes a circuit board 60 , which is disposed below the coupling antenna assembly 100 and is electrically connected to the first metal antenna 10 .

All in all, different from the situation in the prior art, the present application provides a coupled antenna assembly and a mobile terminal. The coupled antenna assembly includes a first metal antenna and a second metal antenna, wherein the first metal antenna includes a first coupling region, the second metal antenna includes a second coupling region, the first coupling region and the second coupling region are stacked on each other, and the two There is a gap between them. Through the above-mentioned design scheme, the coupling areas of the two metal antennas form an antenna together by surface coupling, which solves the problem that the antenna arrangement in the prior art is limited by the antenna support area, and expands the antenna under the same antenna environment size. It can accommodate a larger number of antennas, and the extended antenna has improved antenna performance due to the increase in the routing area, which can achieve low-frequency coverage and improve antenna efficiency in the same frequency band. At the same time, a gap is set between the two coupling areas to ensure that there is no electrical contact between the antennas, but the conduction of electrical energy is carried out by means of coupling and feeding. The coupling capacitance formed by the surface coupling makes the antenna easier to cover low frequencies.

The above description is only an embodiment of the present application, and is not intended to limit the scope of the patent of the present application. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present application, or directly or indirectly applied to other related technologies Fields are similarly included within the scope of patent protection of this application.

Claims

A coupling antenna assembly, characterized in that, comprising:

a first metal antenna, including a first coupling region;

a second metal antenna including a second coupling region;

Wherein, the first coupling region and the second coupling region are arranged on top of each other, and a gap is arranged between the first coupling region and the second coupling region.
The coupled antenna assembly of claim 1, wherein:

The second metal antenna further includes an extension region located outside the first coupling region, and at least one first end of the second coupling region in the extension direction of its length is correspondingly connected with one of the extension regions.
The coupled antenna assembly of claim 2, further comprising:

A ground terminal, wherein one of the expansion regions is provided with a metal surface corresponding to the position of the ground terminal, and the ground terminal is in electrical contact with the metal surface.
The coupled antenna assembly of claim 3, wherein

In the direction away from the first end portion, one of the expansion regions includes a main body portion and a second end portion that are connected to each other in sequence; a non-penetrating recess is provided between the main body portion and the second end portion a groove, and a partial area of the free end adjacent to the groove is bent along the plane where the bottom of the groove is located;

Wherein, the ground terminal is located on a partial area of the free end.
The coupled antenna assembly of claim 1, wherein:

The second coupling region includes a plurality of coupling sub-regions arranged side by side and spaced apart, and the plurality of coupling sub-regions are stacked with the first coupling region.
The coupled antenna assembly according to claim 5, wherein the plurality of coupling sub-regions are symmetrically arranged with respect to the central axis of the first coupling region.
The coupled antenna assembly according to claim 6, wherein the second coupling region comprises two coupling sub-regions arranged side by side and spaced apart, and the two coupling sub-regions are about the central axis of the first coupling region Set symmetrically to each other.
The coupled antenna assembly of claim 1, wherein:

In the stacking direction perpendicular to the first coupling region and the second coupling region, an extension region is connected to one side of the first coupling region, and the plane where the extension region is located is mutually with the stacking direction parallel.
The coupled antenna assembly of claim 1, wherein:

An insulating support of the first metal antenna is arranged at the gap.
The coupled antenna assembly of claim 1, wherein:

The first coupling region and the second coupling region are U-shaped, elongated, square, in-line or L-shaped.
The coupled antenna assembly according to claim 1, wherein the first metal antenna and the second metal antenna are any one of an LDS antenna, an FPC antenna and a metal frame antenna.
The coupled antenna assembly of claim 1, wherein the gap ranges from 0.2 mm to 3 mm.
A mobile terminal, comprising: the coupling antenna assembly according to any one of claims 1-8.
The mobile terminal according to claim 13, further comprising:

frame;

Wherein, the second metal antenna is close to the frame relative to the first metal antenna.
The mobile terminal according to claim 13, further comprising:

The circuit board is arranged below the coupling antenna assembly and is electrically connected with the first metal antenna.