CN111628280A

CN111628280A - Antenna device and mobile terminal

Info

Publication number: CN111628280A
Application number: CN202010457117.8A
Authority: CN
Inventors: 陈文韬
Original assignee: Shanghai Wentai Information Technology Co Ltd
Current assignee: Shanghai Wentai Information Technology Co Ltd
Priority date: 2020-05-26
Filing date: 2020-05-26
Publication date: 2020-09-04

Abstract

The embodiment of the invention provides an antenna device and a mobile terminal, and relates to the technical field of antennas. The antenna device comprises a dielectric substrate and a radiator arranged on one side face of the dielectric substrate. The radiator comprises a first radiating part and a second radiating part, the first radiating part is provided with a first end and a second end which are arranged oppositely, the first end is connected with the second radiating part and forms a first stepped structure, and the second end is provided with a feed port. The antenna device and the mobile terminal provided by the embodiment of the invention can improve the antenna performance, for example, reduce the reflection coefficient of the feed port, thereby improving the signal transmission effect of the antenna device. Further, by adjusting the size of the radiator on the basis of the structure of the antenna device, the antenna device can be used as a 5G antenna, and the reflection coefficient of the feed port can be significantly reduced at the frequency of 28 GHz.

Description

Antenna device and mobile terminal

Technical Field

The invention relates to the technical field of antennas, in particular to an antenna device and a mobile terminal.

Background

With the laying of 5G network equipment, 5G mobile phones are gradually becoming the mainstream of the market. At present, due to the uneven technical development of 5G antennas, some of the 5G antennas applied to 5G mobile terminals (e.g. 5G mobile phones) have poor antenna performance, which affects signal transmission effect and further affects user communication quality, for example.

Disclosure of Invention

One of the objects of the present invention includes providing an antenna device capable of improving antenna performance, for example, reducing the reflection coefficient of a feed port, thereby improving the signal transmission effect of the antenna device.

Another object of the present invention includes providing a mobile terminal capable of improving antenna performance, for example, reducing a reflection coefficient of a feed port, thereby improving a signal transmission effect of an antenna device.

Embodiments of the invention may be implemented as follows:

in a first aspect, an embodiment of the present invention provides an antenna apparatus, including a dielectric substrate and a radiator disposed on a side surface of the dielectric substrate, where the radiator includes a first radiation portion and a second radiation portion, the first radiation portion has a first end and a second end that are disposed opposite to each other, the first end is connected to the second radiation portion and forms a first stepped structure, and the second end is provided with a feed port.

Further, in an alternative embodiment, the first end of the first radiation portion has a first step surface, the second radiation portion has a second step surface, the first step surface and the second step surface form the first step structure, and the second step surface is higher than the first step surface.

Further, in an optional embodiment, the first end of the first radiation portion further has a third step surface opposite to the first step surface, the second radiation portion further has a fourth step surface opposite to the second step surface, the third step surface and the fourth step surface form another first step structure, and the fourth step surface is higher than the third step surface.

Further, in an optional embodiment, the first radiation part and the second radiation part are rectangular, the size of the first radiation part is L1 × D1, the size of the second radiation part is L2 × D2, wherein the range of L1 is 1.9-2.1 mm, the range of D1 is 1.2-1.4 mm, the range of L2 is 2.9-3.1 mm, and the range of D2 is 1.5-1.7 mm.

Further, in an optional embodiment, the radiator further includes a third radiation portion, and the third radiation portion is connected to an end of the second radiation portion, which is far away from the first radiation portion, and forms a second stepped structure.

Further, in an optional embodiment, the first radiation portion has a first step surface, the second radiation portion has a second step surface, the third radiation portion has a fifth step surface, the first step surface and the second step surface form the first step structure, the fifth step surface with the second step surface form the second step structure, and the fifth step surface, the second step surface and the height of the first step surface are reduced in order.

Further, in an alternative embodiment, the third radiating part is rectangular, and the size of the third radiating part is L3 × D3, L3 ranges from 0.9 mm to 1.1mm, and D3 ranges from 2mm to 2.2 mm.

In a second aspect, an embodiment of the present invention provides a mobile terminal, including an antenna apparatus. The antenna device comprises a dielectric substrate and a radiating body arranged on one side face of the dielectric substrate, the radiating body comprises a first radiating portion and a second radiating portion, the first radiating portion is provided with a first end and a second end which are oppositely arranged, the first end is connected with the second radiating portion to form a first stepped structure, and the second end is provided with a feed port.

Further, in an optional embodiment, the number of the radiators includes two, one of the radiators is located in a region of the dielectric substrate corresponding to the top of the mobile terminal, and the other radiator is located in a region of the dielectric substrate corresponding to the bottom of the mobile terminal.

Further, in an optional embodiment, the radiator is a radiation structure of a 5G antenna, the mobile terminal includes a first radiation area for setting the radiator and a second radiation area for setting a radiation structure of a 2G/3G/4G antenna, and the first radiation area is located outside the second radiation area.

The antenna device and the mobile terminal provided by the embodiment of the invention have the beneficial effects that: the radiator is arranged on one side face of the dielectric substrate and fed by the feed port, and the first end of the first radiation part is connected with the second radiation part to form the first stepped structure, so that the antenna device can improve the antenna performance, for example, the reflection coefficient of the feed port is reduced, the signal transmission effect of the antenna device is improved, and the user communication quality and the like can be improved. Further, by adjusting the shape and size of the first radiation part and the second radiation part on the basis of the structure of the antenna device, the antenna device can be used as a 5G antenna, and the reflection coefficient of the feed port can be remarkably reduced at the frequency of 28 GHz.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of an antenna device of a mobile terminal according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a dielectric substrate of an antenna device of a mobile terminal according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a radiator of an antenna device of a mobile terminal according to an embodiment of the present invention;

fig. 4 is a schematic diagram of a reflection coefficient simulation structure of two radiators of an antenna device of a mobile terminal according to an embodiment of the present invention;

fig. 5 is a schematic diagram of a simulation structure of an isolation coefficient between two radiators of an antenna device of a mobile terminal according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a top area of a mobile terminal according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a bottom area of a mobile terminal according to an embodiment of the present invention.

Icon: 10-an antenna arrangement; 100-a dielectric substrate; 110 — a first antenna region; 120-a second antenna region; 130-a third antenna area; 140-a fourth antenna area; 200-a radiator; 210-a first radiating portion; 211-a first end; 212-a second end; 213-a feed port; 214-a first step face; 215-third step level; 220-a second radiating portion; 221-a second step surface; 222-a fourth step surface; 230-a third radiating portion; 231-a fifth step surface; 232-sixth step surface; 240-first step structure; 250-a second step structure; 300-a ground plane; 40-top region; 410-a first radiation area; 420-a second radiation area; 421-a first feeding sheet; 430-a third radiation area; 431-a second feed tab; 440-a ground area; 50-bottom region; 501-a third feeding sheet; 601-GPS/WIFI chip; 602-a first FPC interface; 603-a camera module; 604-earphone hole; 605-a speaker; 606-a second FPC interface; 607-a third FPC interface; 608-USB interface; 609-microphone chip.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. indicate an orientation or a positional relationship based on that shown in the drawings or that the product of the present invention is used as it is, this is only for convenience of description and simplification of the description, and it does not indicate or imply that the device or the element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.

Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.

With the deployment of 5G network devices, 5G mobile terminals such as 5G mobile phones are becoming the mainstream of the market, but limited by the asynchronous development of the 5G technology in the global market, the mobile phones still need to support 2G/3G/4G/5G networks at the same time in the future. In addition, the limited space of the mobile terminal is limited, and the space reserved for the 5G antenna is extremely limited, so that the difficulty in designing the 5G antenna is increased. Moreover, due to the uneven technical development of the 5G antenna, the antenna performance of the 5G antenna is not good when the 5G antenna is partially applied to the 5G mobile terminal, and the signal transmission effect is further affected. In order to improve the technical problem, the invention provides an antenna device which can be used as a 5G antenna, wherein the 5G antenna can coexist with a 2G/3G/4G antenna, has a simple structure and small occupied space, and can improve the performance of the antenna and improve the signal transmission effect.

Referring to fig. 1, the present embodiment provides a mobile terminal, which may be a mobile phone, a tablet computer, a palmtop computer, and the like. The mobile terminal includes a body (not shown) and an antenna device 10 disposed on the body. In addition, the body may include a top area and a bottom area, with a portion of the antenna assembly 10 being located in the top area and another portion being located in the bottom area.

The antenna device 10 includes a dielectric substrate 100, a radiator 200, and a ground plate 300. The dielectric substrate 100 is disposed in the body, the top of the dielectric substrate 100 corresponds to the top area of the body, and the bottom of the dielectric substrate 100 corresponds to the bottom area of the body. The radiator 200 is disposed on one side of the dielectric substrate 100, and the ground plate 300 is disposed on one side of the dielectric substrate 100 away from the radiator 200 for grounding. In this embodiment, the radiator 200 may be selectively etched on the dielectric substrate 100 to serve as a radiation structure of a 5G antenna with a 5G millimeter wave band of 28 GHz.

Alternatively, the dielectric substrate 100 is made of FR4, has a dielectric constant of 4.2 and a size of 70 × 140 × 0.8mm (corresponding to the dimensions in the X direction, the Y direction and the thickness direction in the drawing, respectively, and the X direction is the width direction of the mobile terminal and the Y direction is the length direction of the mobile terminal, and the following dimensions are similar), and the dielectric substrate 100 is used for simulating a PCB circuit board.

Referring to fig. 2, a first antenna region 110, a second antenna region 120, a third antenna region 130 and a fourth antenna region 140 may be disposed on a dielectric substrate 100. It should be noted that only the above antenna regions are shown in the drawings, and the radiation structures of the corresponding antennas on the antenna regions are not shown.

In this embodiment, the number of the first antenna regions 110 includes two, and the two first antenna regions 110 are located at the top and the bottom of the dielectric substrate 100, respectively. The two first antenna regions 110 are correspondingly provided with two radiation structures of 5G antennas, that is, the 5G antennas adopt 2 × 2MIMO antenna arrays. Alternatively, the first antenna region 110 may be set to 5 × 5mm (corresponding to lengths in the X direction and the Y direction in the drawing, respectively). The second antenna region 120 is used to provide a radiation structure of a 2G/3G/4G antenna, and it should be noted that, in this embodiment, the 2G/3G/4G antenna is an antenna whose frequency satisfies the requirements of 2G, 3G, and 4G. The number of second antenna regions 120 includes two. One of the second antenna regions 120 is located on the top of the dielectric substrate 100 and is disposed near the top side of the top of the dielectric substrate 100, for disposing the radiation structure of the diversity antenna of the 2G/3G/4G antenna, and the first antenna region 110 located on the top is located outside the second antenna region 120 and below the second antenna region 120. The other second antenna region 120 is located at the bottom of the dielectric substrate 100, and is disposed near the bottom side of the bottom of the dielectric substrate 100, for setting a radiation structure of a main antenna of a 2G/3G/4G antenna, and the first antenna region 110 and the second antenna region 120 located at the bottom are respectively located at two ends of the bottom of the dielectric substrate 100. The two first antenna regions 110 are located on the same side of the dielectric substrate 100, and the two second antenna regions 120 are located approximately at two diagonal positions of the dielectric substrate 100. The first antenna region 110 is located outside the second antenna region 120, so that the mutual influence between the 5G antenna and the 2G/3G/4G antenna can be reduced. By setting the positions of the first antenna region 110 and the second antenna region 120, the antenna structure can be more compact and occupy less space.

The third antenna area 130 is used to set the radiation structure of the GPS/WIFI antenna. In this embodiment, the GPS/WIFI antenna is a GPS/WIFI2.4G two-in-one antenna. The third antenna region 130 is located on the top of the dielectric substrate 100, and is disposed at two ends of the top of the dielectric substrate 100, respectively, with the second antenna region 120 located on the top of the dielectric substrate 100. Thus, it can be understood that the third antenna region 130 and the first antenna region 110 on the top of the dielectric substrate 100 are located far away from each other, and the 5G antenna and the GPS/WIFI antenna have reduced mutual influence.

The fourth antenna region 140 is used to set a radiation structure of the wireless charging loop antenna to implement wireless charging. The fourth antenna region 140 is located at a middle position of the dielectric substrate 100.

Through the reasonable arrangement of the positions of the first antenna area 110, the second antenna area 120, the third antenna area 130 and the fourth antenna area 140, the antenna device 10 can ensure that the 5G antenna and the 2G/3G/4G antenna coexist, and the mutual influence of the 5G antenna, the 2G/3G/4G antenna, the GPS/WIFI antenna and the wireless charging loop antenna is reduced.

The shape of the radiators 200 provided in the two first antenna regions 110 may be the same or different. In this embodiment, optionally, the radiators 200 disposed in the two first antenna regions 110 have the same shape, and the following description will be made with reference to any one radiator 200 in the two first antenna regions 110.

Referring to fig. 3, the radiator 200 may include a first radiation portion 210 and a second radiation portion 220. Wherein the first radiating portion 210 has a first end 211 and a second end 212 disposed opposite to each other. The first end 211 is connected to the second radiation part 220 and forms a first stepped structure 240, and the second end 212 is provided with a feeding port 213. Alternatively, in this embodiment, the power feeding port 213 is a structure accessed from the bottom side coaxial power feeding. The feeding port 213 is disposed at the center of the second end 212.

By disposing the radiator 200 on one side of the dielectric substrate 100, the radiator 200 is fed by the feeding port 213, and the first end 211 of the first radiating portion 210 is connected to the second radiating portion 220 to form the first stepped structure 240, so that the antenna device 10 can improve antenna performance, for example, reduce the reflection coefficient of the feeding port 213, thereby improving the signal transmission effect of the antenna device 10, and further improving the quality of user communication, for example. Further, by adjusting the shape and size of the first radiation part 210 and the second radiation part 220 based on the structure of the antenna device 10, the antenna device 10 can be made to be a 5G antenna, and the reflection coefficient of the feed port 213 can be significantly reduced at the frequency of 28 GHz.

The first end 211 of the first radiation portion 210 has a first step surface 214, the second radiation portion 220 has a second step surface 221, the first step surface 214 and the second step surface 221 form a first step structure 240, and the second step surface 221 is higher than the first step surface 214. In this way, the radiator 200 is fed at the feeding port 213, and the first stepped structure 240 is raised from the first radiation portion 210 to the second radiation portion 220, so that the reflection coefficient can be further reduced to improve the antenna performance. Optionally, in this embodiment, the first step surface 214 extends from the first end 211 to the second end 212.

It should be noted that, of course, in other embodiments of the present invention, the second step surface 221 may be lower than the first step surface 214. In this embodiment, the second step surface 221 is higher than the first step surface 214, and referring to fig. 3, the second step surface 221 is higher than the first step surface 214 when viewed from the direction opposite to the Y direction in the figure, and it should be understood that, alternatively, the second step surface 221 is considered to protrude outward relative to the first step surface 214 in the direction opposite to the Y direction. Conversely, the case where the second step surface 221 is lower than the first step surface 214 is opposite to the above case.

In addition, it should be noted that one side of the radiator 200 may be provided with the first stepped structure 240, and the other side of the radiator 200 opposite to the first stepped structure 240 may also be provided, that is, one first stepped structure 240 may be provided, or the first stepped structures 240 may also be provided on two opposite sides.

In this embodiment, the first end 211 of the first radiation portion 210 further has a third step surface 215 opposite to the first step surface 214, and the second radiation portion 220 further has a fourth step surface 222 opposite to the second step surface 221. The third step surface 215 and the fourth step surface 222 form another first step structure 240, and the fourth step surface 222 is higher than the third step surface 215. The reflection coefficient is further reduced by providing the first stepped structure 240 on opposite sides. Optionally, in this embodiment, third step surface 215 extends from first end 211 to second end 212.

Of course, in other embodiments of the present invention, the fourth step surface 222 may be lower than the third step surface 215. In this embodiment, the fourth step surface 222 is higher than the third step surface 215, and referring to fig. 3, the fourth step surface 222 is higher than the third step surface 215 when viewed from the Y direction, and it should be understood that, or in the Y direction, the fourth step surface 222 protrudes outward relative to the third step surface 215. Conversely, the case where fourth step face 222 is lower than third step face 215 is opposite to the above case. In addition, the two first step structures 240 have a symmetrical structure.

In addition, in order to further meet the design requirement of the 5G antenna and improve the antenna performance, the radiator 200 may further include a third radiation part 230. The third radiation portion 230 is connected to an end of the second radiation portion 220 away from the first radiation portion 210, and forms a second stepped structure 250.

The third radiation portion 230 has a fifth stepped surface 231, the fifth stepped surface 231 and the second stepped surface 221 form a second stepped structure 250, and heights of the fifth stepped surface 231, the second stepped surface 221 and the first stepped surface 214 are sequentially reduced. That is, the first step surface 214, the second step surface 221, and the fifth step surface 231 are gradually increased from the first radiation portion 210 toward the third radiation portion 230, so that the reflection coefficient is further reduced, and the antenna performance is improved.

It should be noted that one side of the radiator 200 may be provided with the second stepped structure 250, and the other side of the radiator 200 opposite to the second stepped structure 250 may also be provided, that is, one second stepped structure 250 may be provided, or the second stepped structures 250 may be provided on two opposite sides at the same time.

In this embodiment, the third radiation portion 230 further has a sixth stepped surface 232 opposite to the fifth stepped surface 231, the sixth stepped surface 232 and the fourth stepped surface 222 form a second stepped structure 250, and heights of the sixth stepped surface 232, the fourth stepped surface 222 and the third stepped surface 215 are sequentially reduced. That is, in the direction from the first radiation portion 210 to the third radiation portion 230, the third step surface 215, the fourth step surface 222, and the sixth step surface 232 are gradually increased, so that the reflection coefficient is further decreased, and the antenna performance is improved.

Of course, in other embodiments of the present invention, more radiation portions, such as a fourth radiation portion, may be further added to the radiator 200, the fourth radiation portion is connected to one end of the third radiation portion 230 away from the second radiation portion 220, and forms a ladder structure similar to the first ladder structure 240 and the second ladder structure 250 with the third radiation portion 230, and the radiation portions are more similar to the fourth radiation portion, and are not repeated.

In order to facilitate the design of the 5G antenna, in the present embodiment, the radiator 200 has a symmetrical structure as a whole, and the first radiation portion 210, the second radiation portion 220, and the third radiation portion 230 have a rectangular shape. When designing a 5G antenna, the dimensions of the rectangles of the first, second, and

third radiation portions

210, 220, and 230 need only be adjusted to meet the 28GHz band of the 5G antenna. Optionally, in this embodiment, the size of the first radiation part 210 is L1 × D1 (corresponding to the lengths in the X direction and the Y direction in the drawing, respectively, and the following is similar), the size of the second radiation part 220 is L2 × D2, and the size of the third radiation part 230 is L3 × D3, where L1 is 1.9 to 2.1mm, D1 is 1.2 to 1.4mm, L2 is 2.9 to 3.1mm, D2 is 1.5 to 1.7mm, L3 is 0.9 to 1.1mm, and D3 is 2 to 2.2 mm. And, the shorter side of the first radiation part 210 is connected to the shorter side of the second radiation part 220, and the shorter other side of the second radiation part 220 is connected to the longer side of the third radiation part 230. Further, in the present embodiment, the size of the first radiation part 210 is 2 × 1.293mm, the size of the second radiation part 220 is 3 × 1.59mm, and the size of the third radiation part 230 is 1 × 2.1 mm.

Fig. 4 is a schematic diagram of a reflection coefficient simulation structure of two radiators 200 of the antenna device 10 of the mobile terminal according to the embodiment of the present invention; fig. 5 is a schematic diagram of a simulation structure of an isolation coefficient between two radiators 200 of the antenna device 10 of the mobile terminal according to the embodiment of the present invention. Referring to fig. 4 and 5, the antenna performance simulation effect of the 5G antenna in the present embodiment is described below with reference to the drawings.

Referring to fig. 4, the feed port 213 of the radiator 200 disposed on the top of the dielectric substrate 100 is referred to as a first feed port, the feed port 213 of the radiator 200 disposed on the bottom of the dielectric substrate 100 is referred to as a second feed port, and at a frequency of 28GHz, the reflection coefficient value of the first feed port is-35.7 dB, and the reflection coefficient value of the second feed port is-35.3 dB, which are both much smaller than-10 dB required by the conventional antenna design, so as to meet the design requirement. Therefore, the reflection coefficient of the feed port 213 is significantly reduced, thereby improving the signal transmission effect of the antenna device 10.

Referring to fig. 5, in addition, the two 5G antennas form a 2 × 2MIMO form, the isolation indexes of the two radiators 200 are shown in the figure, it can be seen that the isolation coefficient curves from the first feed port to the second feed port and from the second feed port to the first feed port are consistent, the isolation coefficients from the first feed port to the second feed port are all below-30 dB in the frequency range of 10-30GHz, and the interference between the two radiators 200 is small. On the other hand, the two radiators 200 are respectively disposed at the top and the bottom of the dielectric substrate 100, so that they are separated from each other in a physical space, and thus have small interference with each other.

Therefore, the antenna device 10 can improve the antenna performance, for example, reduce the reflection coefficient and the isolation coefficient of the feed port 213, thereby improving the signal transmission effect of the antenna device 10.

Referring to fig. 6 and 7, in addition, in order to enable the 5G antenna to coexist with the 2G/3G/4G antenna and have a simple and compact structure and a small occupied space, the embodiment of the present invention optimizes the layout design of the top area 40 and the bottom area 50 of the mobile terminal, respectively.

The body is provided with a first radiation area 410, a second radiation area 420, and a third radiation area 430. The first radiation area 410 is used to correspond to the first antenna area 110 to set a radiation structure of the 5G antenna, that is, to set the radiator 200 correspondingly. The second radiation region 420 is used to correspond to the second antenna region 120 for setting the radiation structure of the 2G/3G/4G antenna. The third radiation area 430 is configured to correspond to the third antenna area 130, and is configured to set a radiation structure of the GPS/WIFI antenna. The first radiation area 410 is located outside the second radiation area 420, and the first radiation area 410 is located outside the third radiation area 430, and the second radiation area 420 is located outside the third radiation area 430. Therefore, the three areas are isolated from each other, and the influence of the 5G antenna, the 2G/3G/4G antenna and the GPS/WIFI antenna on each other can be effectively reduced.

In this embodiment, two first radiation areas 410 are respectively used for corresponding to two first antenna areas 110 one by one, so that two 5G antennas form a 2 × 2MIMO antenna array. The second radiation areas 420 are two, wherein one second radiation area 420 corresponds to the second antenna area 120 for setting the radiation structure of the diversity antenna of the 2G/3G/4G antenna, and the other second radiation area 420 corresponds to the second antenna area 120 for setting the radiation structure of the main antenna of the 2G/3G/4G antenna.

Referring to fig. 6, referring to the top area 40 of the mobile terminal, a second radiation area 420 for setting a radiation structure of a diversity antenna of a 2G/3G/4G antenna is located on the top side of the top area 40, wherein a first radiation area 410 is located on the lower side of the second radiation area 420 and outside the second radiation area 420. The size of the first radiation area 410 may be selected to be 5X 5mm (corresponding to the length in the X-direction, Y-direction, respectively, in the drawing, and the like hereinafter). Further, the second radiating area 420 may be located on the top side of the top area 40 and extend from one end of the top to the middle thereof. The first radiation region 410 is located at a lower side of one end of the second radiation region 420. Therefore, the mutual influence of the diversity antenna of the 5G antenna and the diversity antenna of the 2G/3G/4G antenna can be reduced, the structure is more compact, and the occupied space of the antenna is smaller. Optionally, the second radiation area 420 at the top area 40 has dimensions of 45 x 6 mm. A plurality of first feeding pieces 421 for feeding a radiating structure of a diversity antenna of a 2G/3G/4G antenna are disposed in the second radiating region 420. As an example, the number of the first feeding pieces 421 in the drawing is 5, and the first feeding pieces are sequentially spaced in the X direction in the second radiation region 420.

At the top area 40 of the mobile terminal, the third radiation area 430 is located at an end of the top side of the top area 40 remote from the second radiation area 420. Optionally, the size of the third radiation area 430 is 8 × 12mm, a second feed sheet 431 is disposed in the third radiation area 430, and the second feed sheet 431 is a feed sheet of the GPS/WIFI antenna. The second feed pad 431 has a size of 0.5 × 2 × 1.5 mm. The first radiation region 410 is located on a lower side of an end of the second radiation region 420 remote from the third radiation region 430. So that the 5G antenna and the GPS/WIFI antenna on the top area 40 are far away from each other.

The mobile terminal further includes a camera module 603 and a headphone aperture 604, and on the top side of the top area 40, the second radiation area 420, the camera module 603, the headphone aperture 604 and the third radiation area 430 are sequentially distributed, so that the camera module 603 and the headphone aperture 604 are located between the second radiation area 420 and the third radiation area 430. The camera module 603 has a size of 4 × 4 mm. The dimensions of the earphone aperture 604 are 3 x 10 mm.

A ground region 440 is provided on the top region 40 to enable grounding. The ground region 440 is located below the camera module 603, the headphone jack 604, and the third radiation region 430.

The mobile terminal further comprises a GPS/WIFI chip 601 and a first FPC interface 602 disposed in the top area 40. The GPS/WIFI chip 601 is located below the second radiation area 420, and the size of the GPS/WIFI chip is 6 × 6 mm. First FPC interface 602 is located the below of second radiation zone 420, and sets up near GPS/WIFI chip 601, and the size of first FPC interface 602 is 1 x 5 mm.

For the top area 40 of the mobile terminal, by arranging the relative positions of the first radiation area 410, the second radiation area 420, the third radiation area 430 and the device, the structure of the top area 40 is more compact, so that the 5G antenna can be designed to occupy a smaller space.

Referring to fig. 7, referring to the bottom area 50 of the mobile terminal, the first radiation area 410 located at the bottom area 50 is disposed near the bottom side of the bottom area 50 to correspond to the first antenna area 110 at the bottom of the dielectric substrate 100.

The mobile terminal further comprises a speaker 605, the speaker 605 being arranged at the bottom area 50 and above the first radiation area 410. The size of the speaker 605 is 15.8 × 7 mm.

The second radiation region 420 located at the bottom region 50 is disposed at an end of the bottom side of the bottom region 50 away from the first radiation region 410. The second radiation region 420 corresponds to the second antenna region 120 at the bottom of the dielectric substrate 100. The second radiation region 420 is provided with a third feed plate 501 as a main antenna of a 2G/3G/4G antenna. As an example, the number of the third feeding pieces 501 in the drawing is 8.

The mobile terminal further comprises a second FPC interface 606 and a third FPC interface 607, both the second FPC interface 606 and the third FPC interface 607 being located within the second radiation area 420. The second FPC interface 606 and the third FPC interface 607 are the same size, both 5 × 1 mm.

The mobile terminal further includes a USB interface 608, and the USB interface 608 is disposed in the second radiation area 420 and is located at a middle position of the bottom side of the bottom area 50. The size of the USB interface 608 is 1.8 × 6.85 mm.

The mobile terminal further comprises a microphone chip 609, the microphone chip 609 being located within the second radiation area 420, and the USB interface 608 being located between the microphone chip 609 and the first radiation area 410. The microphone chip 609 has a size of 2 × 2 mm.

For the bottom area 50 of the mobile terminal, by arranging the relative positions of the first radiation area 410, the second radiation area 420 and the device, the structure of the bottom area 50 is more compact, so that the 5G antenna can be designed to occupy less space.

In summary, the present invention provides an antenna device 10 and a mobile terminal, in which a radiator 200 is disposed on a side surface of a dielectric substrate 100, the radiator 200 is fed by a feeding port 213, and a first end 211 of a first radiation portion 210 is connected to a second radiation portion 220 to form a first stepped structure 240, so that the antenna device 10 can improve antenna performance, for example, reduce a reflection coefficient of the feeding port 213, thereby improving a signal transmission effect of the antenna device 10. Further, by adjusting the shape and size of the first radiation portion 210 and the second radiation portion 220 based on the structure of the antenna device 10, the antenna device 10 can be made to be a 5G antenna, and the reflection coefficient of the feed port 213 can be significantly reduced at the frequency of 28 GHz.

In the present embodiment, the 5G antenna is in the form of a 2 × 2MIMO antenna. In other embodiments, the radiator 200 as a 5G antenna can be added, and the size of the radiator 200 can be further reduced, so that the 5G antenna can be further developed to the m × n (m ≧ 4, n ≧ 4) MIMO system.

The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. The antenna device is characterized by comprising a dielectric substrate and a radiating body arranged on one side face of the dielectric substrate, wherein the radiating body comprises a first radiating part and a second radiating part, the first radiating part is provided with a first end and a second end which are oppositely arranged, the first end is connected with the second radiating part to form a first stepped structure, and the second end is provided with a feed port.

2. The antenna device according to claim 1, wherein the first end of the first radiation portion has a first step surface, the second radiation portion has a second step surface, the first step surface and the second step surface form the first step structure, and the second step surface is higher than the first step surface.

3. The antenna device according to claim 2, wherein the first end of the first radiation portion further has a third step surface opposite to the first step surface, the second radiation portion further has a fourth step surface disposed opposite to the second step surface, the third step surface and the fourth step surface form another first step structure, and the fourth step surface is higher than the third step surface.

4. The antenna device according to any one of claims 1 to 3, wherein the first radiation portion and the second radiation portion are rectangular, the first radiation portion has a size of L1 xD 1, and the second radiation portion has a size of L2 xD 2, wherein L1 is 1.9 to 2.1mm, D1 is 1.2 to 1.4mm, L2 is 2.9 to 3.1mm, and D2 is 1.5 to 1.7 mm.

5. The antenna device according to claim 1, wherein the radiator further includes a third radiation portion, and the third radiation portion is connected to an end of the second radiation portion, which is far from the first radiation portion, and forms a second stepped structure.

6. The antenna device according to claim 5, wherein the first radiation portion has a first step surface, the second radiation portion has a second step surface, the third radiation portion has a fifth step surface, the first step surface and the second step surface form the first step structure, the fifth step surface and the second step surface form the second step structure, and heights of the fifth step surface, the second step surface, and the first step surface are sequentially reduced.

7. The antenna device as claimed in claim 6, wherein the third radiating portion has a rectangular shape, and the size of the third radiating portion is L3 XD 3, L3 is in the range of 0.9 to 1.1mm, and D3 is in the range of 2 to 2.2 mm.

8. A mobile terminal, characterized in that it comprises an antenna device according to any of claims 1 to 7.

9. The mobile terminal of claim 8, wherein the number of radiators comprises two, one of the radiators being located in a region of the dielectric substrate corresponding to a top of the mobile terminal, and the other radiator being located in a region of the dielectric substrate corresponding to a bottom of the mobile terminal.

10. The mobile terminal of claim 8, wherein the radiator is a radiation structure of a 5G antenna, and the mobile terminal comprises a first radiation region for setting the radiator and a second radiation region for setting a radiation structure of a 2G/3G/4G antenna, and the first radiation region is located outside the second radiation region.