Antenna device and mobile terminal

Abstract

Embodiments of the present invention provide an antenna device and a mobile terminal, relating to the field of antenna technology. The antenna device includes a dielectric substrate and a radiator arranged on one side of the dielectric substrate. The radiator includes a first radiating portion and a second radiating portion, the first radiating portion has a first end and a second end arranged opposite to each other, the first end is connected to the second radiating portion and forms a first stepped structure, and the second end is provided with a feeding port. The antenna device and mobile terminal provided by the embodiments of the present invention can improve the antenna performance, for example, reduce the reflection coefficient of the feeding port, thereby improving the signal transmission effect of the antenna device. Furthermore, 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 at a frequency of 28 GHz, the reflection coefficient of the feeding port can be significantly reduced.

Description

Technical Field

[0001] The present invention relates to the field of antenna technology, and in particular to an antenna device and a mobile terminal. Background Art

[0002] With the deployment of 5G network equipment, 5G mobile phones are gradually becoming mainstream in the market. However, due to the uneven development of 5G antenna technology, some 5G antennas used in 5G mobile terminals (such as 5G mobile phones) have poor antenna performance, which affects signal transmission and, in turn, affects user call quality. Summary of the Invention

[0003] One of the objectives of the present invention is to provide an antenna device that can improve antenna performance, such as reducing the reflection coefficient of a feeding port, thereby improving the signal transmission effect of the antenna device.

[0004] Another object of the present invention includes providing a mobile terminal that can improve antenna performance, such as reducing the reflection coefficient of the feeding port, thereby improving the signal transmission effect of the antenna device.

[0005] The embodiments of the present invention can be implemented as follows:

[0006] In a first aspect, an embodiment of the present invention provides an antenna device, comprising a dielectric substrate and a radiator arranged on a side surface of the dielectric substrate, the radiator comprising a first radiating portion and a second radiating portion, the first radiating portion having a first end and a second end arranged opposite to each other, the first end being connected to the second radiating portion to form a first stepped structure, and the second end being provided with a feeding port.

[0007] Further, in an optional embodiment, the first end of the first radiating portion has a first step surface, the second radiating 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.

[0008] Furthermore, in an optional embodiment, the first end of the first radiating portion also has a third step surface opposite to the first step surface, and the second radiating portion also has a fourth step surface arranged 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.

[0009] Furthermore, in an optional embodiment, the first radiating portion and the second radiating portion are both rectangular, the size of the first radiating portion is L1×D1, and the size of the second radiating portion is L2×D2, wherein the range of L1 is 1.9~2.1mm, the range of D1 is 1.2~1.4mm, the range of L2 is 2.9~3.1mm, and the range of D2 is 1.5~1.7mm.

[0010] Furthermore, in an optional embodiment, the radiator further includes a third radiating portion, and the third radiating portion is connected to an end of the second radiating portion away from the first radiating portion to form a second stepped structure.

[0011] Further, in an optional embodiment, the first radiating portion has a first step surface, the second radiating portion has a second step surface, and the third radiating portion has a fifth step surface. The first step surface and the second step surface form the first step structure, and the fifth step surface and the second step surface form the second step structure. The heights of the fifth step surface, the second step surface and the first step surface decrease successively.

[0012] Furthermore, in an optional embodiment, the third radiating portion is rectangular, and the size of the third radiating portion is L3×D3, L3 is in the range of 0.9 to 1.1 mm, and D3 is in the range of 2 to 2.2 mm.

[0013] In a second aspect, an embodiment of the present invention provides a mobile terminal including an antenna device. The antenna device includes a dielectric substrate and a radiator disposed on a side surface of the dielectric substrate. The radiator includes a first radiating portion and a second radiating portion. The first radiating portion has a first end and a second end disposed opposite each other. The first end is connected to the second radiating portion to form a first stepped structure. The second end is provided with a feeding port.

[0014] Further, in an optional embodiment, the number of the radiators includes two, one of which is located in the area of ​​the dielectric substrate corresponding to the top of the mobile terminal, and the other radiator is located in the area of ​​the dielectric substrate corresponding to the bottom of the mobile terminal.

[0015] Furthermore, in an optional embodiment, the radiator is a radiation structure of a 5G antenna, and the mobile terminal includes a first radiation area for setting the radiator and a second radiation area for setting the radiation structure of a 2G / 3G / 4G antenna, and the first radiation area is located outside the second radiation area.

[0016] The antenna device and mobile terminal provided by embodiments of the present invention have the following beneficial effects: by disposing a radiator on one side of a dielectric substrate, the radiator being fed by a feed port, and the first end of a first radiating portion being connected to a second radiating portion to form a first stepped structure, the antenna device can improve antenna performance, for example, by reducing the reflection coefficient of the feed port, thereby improving the signal transmission efficiency of the antenna device and, for example, improving user call quality. Furthermore, by adjusting the shape and dimensions of the first and second radiating portions based on 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 a frequency of 28 GHz. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 A schematic structural diagram of an antenna device for a mobile terminal provided in an embodiment of the present invention;

[0019] Figure 2 A schematic structural diagram of a dielectric substrate of an antenna device for a mobile terminal provided by an embodiment of the present invention;

[0020] Figure 3 A schematic structural diagram of a radiator of an antenna device of a mobile terminal provided by an embodiment of the present invention;

[0021] Figure 4 A schematic diagram of a reflection coefficient simulation structure of two radiators of an antenna device of a mobile terminal provided by an embodiment of the present invention;

[0022] Figure 5 A schematic diagram of a simulation structure of an isolation coefficient between two radiators of an antenna device of a mobile terminal provided by an embodiment of the present invention;

[0023] Figure 6 A schematic structural diagram of the top area of ​​a mobile terminal provided by an embodiment of the present invention;

[0024] Figure 7 A schematic structural diagram of the bottom area of ​​a mobile terminal provided by an embodiment of the present invention.

[0025] Icons: 10-antenna device; 100-dielectric substrate; 110-first antenna area; 120-second antenna area; 130-third antenna area; 140-fourth antenna area; 200-radiator; 210-first radiating portion; 211-first end; 212-second end; 213-feeding port; 214-first stepped surface; 215-third stepped surface; 220-second radiating portion; 221-second stepped surface; 222-fourth stepped surface; 230-third radiating portion; 231-fifth stepped surface; 232-sixth stepped surface; 240-first stepped structure; 25 0-second step structure; 300-ground plate; 40-top area; 410-first radiation area; 420-second radiation area; 421-first feed plate; 430-third radiation area; 431-second feed plate; 440-ground area; 50-bottom area; 501-third feed plate; 601-GPS / WIFI chip; 602-first FPC interface; 603-camera module; 604-headphone jack; 605-speaker; 606-second FPC interface; 607-third FPC interface; 608-USB interface; 609-microphone chip. DETAILED DESCRIPTION

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0028] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0029] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the invention is usually placed when in use. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0030] In addition, the terms "first", "second", etc., if used, are merely used to distinguish and describe, and should not be understood as indicating or implying relative importance.

[0031] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0032] With the deployment of 5G network equipment, 5G mobile terminals such as 5G mobile phones have gradually become the mainstream of the market. However, due to the asynchronous development of 5G technology in the global market, mobile phones will still need to support 2G / 3G / 4G / 5G networks at the same time for some time in the future. In addition, due to the limited space of mobile terminals, the space left for 5G antennas is extremely limited, which makes the design of 5G antennas more difficult. Moreover, due to the uneven development of 5G antenna technology, some 5G antennas used on 5G mobile terminals have poor antenna performance, which in turn affects the signal transmission effect. In order to improve the above technical problems, the present invention proposes an antenna device that can be used as a 5G antenna. The 5G antenna can coexist with a 2G / 3G / 4G antenna and has a simple structure and occupies a small space. It can also improve antenna performance and improve signal transmission effect.

[0033] Please refer to Figure 1 This embodiment provides a mobile terminal, which can be a mobile phone, tablet computer, or PDA. The mobile terminal includes a body (not shown) and an antenna device 10 disposed on the body. Furthermore, the body can include a top region and a bottom region, with a portion of the antenna device 10 located in the top region and another portion located in the bottom region.

[0034] The antenna device 10 includes a dielectric substrate 100, a radiator 200, and a ground plane 300. The dielectric substrate 100 is disposed within the housing, with the top of the dielectric substrate 100 corresponding to the top region of the housing, and the bottom of the dielectric substrate 100 corresponding to the bottom region of the housing. The radiator 200 is disposed on a side surface of the dielectric substrate 100, and the ground plane 300 is disposed on a side of the dielectric substrate 100 facing away from the radiator 200 for grounding. In this embodiment, the radiator 200 is optionally etched onto the dielectric substrate 100, serving as the radiating structure of a 5G antenna operating in the 5G millimeter wave band at 28 GHz.

[0035] Optionally, the dielectric substrate 100 is made of FR4, has a dielectric constant of 4.2, and has dimensions of 70×140×0.8 mm (corresponding to the dimensions in the X direction, Y direction, and thickness direction in the accompanying drawings, 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. The dimensions are similar below). The dielectric substrate 100 is used to simulate a PCB circuit board.

[0036] See also Figure 2The dielectric substrate 100 may be provided with a first antenna region 110, a second antenna region 120, a third antenna region 130, and a fourth antenna region 140. It should be noted that the figure only shows the above-mentioned antenna regions, and does not show the radiation structures of the corresponding antennas on the antenna regions.

[0037] Among them, the first antenna area 110 is used to set the radiation structure of the 5G antenna, that is, the first antenna area 110 is used to set the radiator 200. In this embodiment, the number of first antenna areas 110 includes two, and the two first antenna areas 110 are respectively located at the top and bottom of the dielectric substrate 100. The two first antenna areas 110 correspond to the radiation structures of two 5G antennas, that is, the 5G antenna adopts a 2×2 MIMO antenna array. Optionally, the first antenna area 110 can be set to 5×5mm (corresponding to the length in the X direction and Y direction in the accompanying drawings, respectively). The second antenna area 120 is used to set the radiation structure of the 2G / 3G / 4G antenna. It should be noted that in this embodiment, the 2G / 3G / 4G antenna is an antenna whose frequency meets the requirements of 2G, 3G and 4G. The number of second antenna areas 120 includes two. One second antenna region 120 is located on the top of the dielectric substrate 100, near the top side of the dielectric substrate 100, and is used to configure the radiating structure of the diversity antenna of the 2G / 3G / 4G antenna. The first antenna region 110 located on the top is located outside and below this second antenna region 120. The other second antenna region 120 is located on the bottom of the dielectric substrate 100, near the bottom side of the dielectric substrate 100, and is used to configure the radiating structure of the main antenna of the 2G / 3G / 4G antenna. The first antenna region 110 and the second antenna region 120 located on the bottom are located at opposite 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 opposite corners of the dielectric substrate 100. The first antenna region 110 is located outside the second antenna region 120, which can reduce the mutual interference between the 5G antenna and the 2G / 3G / 4G antenna. By setting the positions of the first antenna region 110 and the second antenna region 120 , the antenna structure can be made more compact and occupy less space.

[0038] The third antenna region 130 is used to configure the GPS / WIFI antenna's radiation structure. In this embodiment, the GPS / WIFI antenna is a two-in-one GPS / WIFI 2.4G antenna. The third antenna region 130 is located on top of the dielectric substrate 100 and is positioned at opposite ends of the dielectric substrate 100, along with the second antenna region 120 located on top of the dielectric substrate 100. As can be seen, the third antenna region 130 is positioned away from the first antenna region 110 located on top of the dielectric substrate 100, minimizing interference between the 5G antenna and the GPS / WIFI antenna.

[0039] The fourth antenna region 140 is used to set the radiation structure of the wireless charging ring antenna to achieve wireless charging. The fourth antenna region 140 is located in the middle of the dielectric substrate 100.

[0040] By properly positioning the first antenna region 110, the second antenna region 120, the third antenna region 130, and the fourth antenna region 140, the antenna device 10 can ensure the coexistence of the 5G antenna and the 2G / 3G / 4G antenna, thereby reducing the mutual influence among the 5G antenna, the 2G / 3G / 4G antenna, the GPS / WIFI antenna, and the wireless charging ring antenna.

[0041] In addition, the shapes of the radiators 200 provided in the two first antenna regions 110 can be the same or different. In this embodiment, optionally, the radiators 200 provided in the two first antenna regions 110 have the same shape, and the following description will be based on any one of the radiators 200 in the two first antenna regions 110.

[0042] See also Figure 3 The radiator 200 may include a first radiating portion 210 and a second radiating portion 220. The first radiating portion 210 has a first end 211 and a second end 212 that are oppositely disposed. The first end 211 is connected to the second radiating portion 220 to form a first stepped structure 240. The second end 212 is provided with a feeding port 213. Optionally, in this embodiment, the feeding port 213 employs a coaxial feeding structure from the bottom side. The feeding port 213 is located at the center of the second end 212.

[0043] By disposing a radiator 200 on one side of the dielectric substrate 100, the radiator 200 is fed by a feed port 213, and the first end 211 of the first radiating portion 210 is connected to the second radiating portion 220 to form a first stepped structure 240. This allows the antenna device 10 to improve antenna performance, for example, by reducing the reflection coefficient of the feed port 213, thereby improving the signal transmission efficiency of the antenna device 10 and, for example, improving user call quality. Furthermore, by adjusting the shape and dimensions of the first radiating portion 210 and the second radiating portion 220 based on the structure of the antenna device 10, the antenna device 10 can be used as a 5G antenna, and the reflection coefficient of the feed port 213 can be significantly reduced at a frequency of 28 GHz.

[0044] The first end 211 of the first radiating portion 210 has a first stepped surface 214, and the second radiating portion 220 has a second stepped surface 221. The first stepped surface 214 and the second stepped surface 221 form a first stepped structure 240, with the second stepped surface 221 being higher than the first stepped surface 214. Thus, when the radiator 200 is fed at the feeding port 213, the first stepped structure 240 is elevated from the first radiating portion 210 to the second radiating portion 220, further reducing the reflection coefficient and improving antenna performance. Optionally, in this embodiment, the first stepped surface 214 extends from the first end 211 to the second end 212.

[0045] 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. Figure 3 , as viewed from the direction opposite to the Y direction in the figure, the second step surface 221 is higher than the first step surface 214. It should be understood that, in other words, in the direction opposite to the Y direction, the second step surface 221 can also be considered to be protruding outward relative to the first step surface 214. Conversely, the situation where the second step surface 221 is lower than the first step surface 214 is the opposite of the above situation.

[0046] In addition, it should be noted that a first stepped structure 240 can be provided on one side of the radiator 200, and a first stepped structure 240 can also be provided on the other opposite side of the radiator 200. That is, one first stepped structure 240 can be provided, or first stepped structures 240 can be provided on both opposite sides at the same time.

[0047] In this embodiment, the first end 211 of the first radiating portion 210 further includes a third stepped surface 215 opposite the first stepped surface 214. The second radiating portion 220 further includes a fourth stepped surface 222 opposite the second stepped surface 221. The third stepped surface 215 and the fourth stepped surface 222 form another first stepped structure 240, with the fourth stepped surface 222 being higher than the third stepped surface 215. Providing the first stepped structure 240 on both opposing sides further reduces the reflection coefficient. Optionally, in this embodiment, the third stepped surface 215 extends from the first end 211 to the second end 212.

[0048] 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. Figure 3, as viewed in the Y direction in the figure, the fourth step surface 222 is higher than the third step surface 215. It should be understood that, in other words, in the Y direction, the fourth step surface 222 protrudes outward relative to the third step surface 215. Conversely, the situation where the fourth step surface 222 is lower than the third step surface 215 is the opposite of the above situation. Furthermore, the two first step structures 240 are symmetrical.

[0049] In addition, to further meet 5G antenna design requirements and improve antenna performance, the radiator 200 may further include a third radiating portion 230. The third radiating portion 230 is connected to an end of the second radiating portion 220 away from the first radiating portion 210 to form a second stepped structure 250.

[0050] The third radiating portion 230 includes a fifth stepped surface 231. The fifth stepped surface 231 and the second stepped surface 221 form a second stepped structure 250. The fifth stepped surface 231, the second stepped surface 221, and the first stepped surface 214 decrease in height. In other words, the first stepped surface 214, the second stepped surface 221, and the fifth stepped surface 231 gradually increase in height from the first radiating portion 210 toward the third radiating portion 230, thereby further reducing the reflection coefficient and improving antenna performance.

[0051] It should be noted that a second stepped structure 250 can be provided on one side of the radiator 200, and a second stepped structure 250 can also be provided on the other opposite side of the radiator 200. That is, one second stepped structure 250 can be provided, or second stepped structures 250 can be provided on both opposite sides at the same time.

[0052] In this embodiment, the third radiating portion 230 further includes a sixth stepped surface 232 opposite the fifth stepped surface 231. The sixth stepped surface 232 and the fourth stepped surface 222 form a second stepped structure 250. The sixth stepped surface 232, the fourth stepped surface 222, and the third stepped surface 215 successively decrease in height. In other words, the third stepped surface 215, the fourth stepped surface 222, and the sixth stepped surface 232 gradually increase in height from the first radiating portion 210 toward the third radiating portion 230, thereby further reducing the reflection coefficient and improving antenna performance.

[0053] Of course, in other embodiments of the present invention, the radiator 200 can be further provided with more radiating parts, such as a fourth radiating part, which is connected to the end of the third radiating part 230 away from the second radiating part 220, and forms a stepped structure similar to the first stepped structure 240 and the second stepped structure 250 with the third radiating part 230, and more cases of the radiating part are similar to the structure of the above-mentioned fourth radiating part, which will not be repeated.

[0054] To facilitate 5G antenna design, in this embodiment, the radiator 200 has an overall symmetrical structure, with the first radiating portion 210, the second radiating portion 220, and the third radiating portion 230 all being rectangular. When designing a 5G antenna, simply adjusting the rectangular dimensions of the first radiating portion 210, the second radiating portion 220, and the third radiating portion 230 will ensure compliance with the 28 GHz 5G antenna frequency band. Optionally, in this embodiment, the dimensions of the first radiating portion 210 are L1 × D1 (corresponding to the lengths in the X and Y directions in the accompanying drawings, respectively, and similarly hereinafter), the dimensions of the second radiating portion 220 are L2 × D2, and the dimensions of the third radiating portion 230 are L3 × D3, where L1 ranges from 1.9 to 2.1 mm, D1 ranges from 1.2 to 1.4 mm, L2 ranges from 2.9 to 3.1 mm, D2 ranges from 1.5 to 1.7 mm, L3 ranges from 0.9 to 1.1 mm, and D3 ranges from 2 to 2.2 mm. Furthermore, the shorter side of the first radiating portion 210 is connected to the shorter side of the second radiating portion 220, and the other shorter side of the second radiating portion 220 is connected to the longer side of the third radiating portion 230. Furthermore, in this embodiment, the dimensions of the first radiating portion 210 are 2×1.293 mm, the dimensions of the second radiating portion 220 are 3×1.59 mm, and the dimensions of the third radiating portion 230 are 1×2.1 mm.

[0055] Figure 4 A schematic diagram of a reflection coefficient simulation structure of two radiators 200 of an antenna device 10 of a mobile terminal provided by an embodiment of the present invention; Figure 5 This is a schematic diagram of a simulation structure of the isolation coefficient between two radiators 200 of the antenna device 10 of a mobile terminal provided by an embodiment of the present invention. Figure 4 and Figure 5 The following describes the antenna performance simulation effect of the 5G antenna in this embodiment with reference to the accompanying drawings.

[0056] See also Figure 4 The feed port 213 of the radiator 200 located on the top of the dielectric substrate 100 is designated as the first feed port, and the feed port 213 of the radiator 200 located on the bottom of the dielectric substrate 100 is designated as the second feed port. At a frequency of 28 GHz, the reflection coefficient of the first feed port is -35.7 dB, and the reflection coefficient of the second feed port is -35.3 dB. Both values ​​are significantly lower than the -10 dB requirement of conventional antenna design, meeting the design requirements. This significantly reduces the reflection coefficient of the feed port 213, thereby improving the signal transmission performance of the antenna device 10.

[0057] See also Figure 5Furthermore, the two 5G antennas form a 2×2 MIMO configuration. The isolation performance of the two radiators 200 is shown in the figure. 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. Within the 10-30 GHz frequency range, the isolation coefficient from the first feed port to the second feed port is below -30 dB, indicating minimal interference between the two radiators 200. Furthermore, since the two radiators 200 are located at the top and bottom of the dielectric substrate 100, respectively, they are physically separated, resulting in minimal mutual interference.

[0058] Therefore, the antenna device 10 can improve antenna performance, for example, reduce the reflection coefficient and isolation coefficient of the feeding port 213 , thereby improving the signal transmission effect of the antenna device 10 .

[0059] See also Figure 6 and Figure 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 occupy a small space, the embodiments of the present invention optimize the layout design of the top area 40 and the bottom area 50 of the mobile terminal.

[0060] 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 the radiation structure of the 5G antenna, that is, to set the radiator 200 accordingly. The second radiation area 420 is used to correspond to the second antenna area 120 and is used to set the radiation structure of the 2G / 3G / 4G antenna. The third radiation area 430 is used to correspond to the third antenna area 130 and is used to set the 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. In this way, the above three areas are isolated from each other, which can effectively reduce the impact of the 5G antenna, 2G / 3G / 4G antenna, and GPS / WIFI antenna on each other.

[0061] In this embodiment, there are two first radiation areas 410, each corresponding one-to-one with the two first antenna areas 110, so that the two 5G antennas form a 2×2 MIMO antenna array. There are two second radiation areas 420, one of which corresponds to the second antenna area 120 of the radiating structure of the diversity antenna for the 2G / 3G / 4G antenna, and the other second radiation area 420 corresponds to the second antenna area 120 of the radiating structure of the main antenna for the 2G / 3G / 4G antenna.

[0062] See also Figure 6, referring to the top area 40 of the mobile terminal, the second radiation area 420 of the radiation structure of the diversity antenna for setting the 2G / 3G / 4G antenna is located on the top side of the top area 40, and one of the first radiation areas 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 can be optionally 5×5mm (corresponding to the length in the X direction and the Y direction in the accompanying drawings, respectively, and similarly below). Further, the second radiation area 420 can 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 area 410 is located on the lower side of one end of the second radiation area 420. In this way, the mutual influence between the 5G antenna and the diversity antenna of the 2G / 3G / 4G antenna can be reduced, and the structure is more compact and the antenna occupies less space. Optionally, the size of the second radiation area 420 located in the top area 40 is 45×6mm. The second radiation region 420 is provided with a plurality of first feed plates 421 for feeding the radiation structure of the diversity antenna of the 2G / 3G / 4G antenna. As an example, the figure shows five first feed plates 421, which are spaced apart in the second radiation region 420 along the X direction.

[0063] In the top area 40 of the mobile terminal, the third radiation area 430 is located on the top side of the top area 40, away from the end of the second radiation area 420. Optionally, the size of the third radiation area 430 is 8×12 mm, and a second feed plate 431 is provided in the third radiation area 430. The second feed plate 431 is the feed plate of the GPS / WIFI antenna. The size of the second feed plate 431 is 0.5×2×1.5 mm. The first radiation area 410 is located on the lower side of the second radiation area 420 away from the end of the third radiation area 430. In this way, the 5G antenna and the GPS / WIFI antenna on the top area 40 are far away from each other.

[0064] The mobile terminal also includes a camera module 603 and an earphone jack 604. On the top side of the top region 40, the second radiation area 420, the camera module 603, the earphone jack 604, and the third radiation area 430 are arranged in that order, with the camera module 603 and the earphone jack 604 located between the second radiation area 420 and the third radiation area 430. The dimensions of the camera module 603 are 4×4 mm. The dimensions of the earphone jack 604 are 3×10 mm.

[0065] A grounding area 440 is provided on the top area 40 for grounding. The grounding area 440 is located below the camera module 603 , the earphone jack 604 and the third radiation area 430 .

[0066] The mobile terminal also includes a GPS / WIFI chip 601 and a first FPC interface 602 disposed in the top region 40. The GPS / WIFI chip 601 is located below the second radiation region 420 and has dimensions of 6 x 6 mm. The first FPC interface 602 is located below the second radiation region 420 and adjacent to the GPS / WIFI chip 601 and has dimensions of 1 x 5 mm.

[0067] 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 components, the structure of the top area 40 is made more compact, so that the 5G antenna can be designed to occupy a smaller space.

[0068] See also Figure 7 , referring to the bottom area 50 of the mobile terminal, the first radiation area 410 located in the bottom area 50 is arranged 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.

[0069] The mobile terminal further includes a speaker 605, which is disposed in the bottom area 50 and above the first radiation area 410. The size of the speaker 605 is 15.8×7 mm.

[0070] The second radiating region 420 located in the bottom region 50 is disposed at the bottom side of the bottom region 50, away from the first radiating region 410. This second radiating region 420 corresponds to the second antenna region 120 at the bottom of the dielectric substrate 100. A third feed plate 501, serving as the main antenna for the 2G / 3G / 4G antenna, is disposed within this second radiating region 420. As an example, eight third feed plates 501 are shown in the accompanying drawings.

[0071] The mobile terminal further includes a second FPC interface 606 and a third FPC interface 607, both of which are located in the second radiation area 420. The second FPC interface 606 and the third FPC interface 607 have the same size, 5×1 mm.

[0072] The mobile terminal further includes a USB interface 608, which is disposed in the second radiation area 420 and located in the middle of the bottom side of the bottom area 50. The size of the USB interface 608 is 1.8×6.85 mm.

[0073] The mobile terminal further includes a microphone chip 609, which is located in the second radiation area 420, and the USB interface 608 is located between the microphone chip 609 and the first radiation area 410. The size of the microphone chip 609 is 2×2 mm.

[0074] 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 components, the structure of the bottom area 50 is made more compact, so that the 5G antenna can be designed to occupy a smaller space.

[0075] In summary, embodiments of the present invention provide an antenna device 10 and a mobile terminal. By disposing a radiator 200 on a side surface of a dielectric substrate 100, the radiator 200 is fed by a feeding port 213, and the first end 211 of the first radiating portion 210 is connected to the second radiating portion 220 to form a first stepped structure 240, the antenna device 10 can improve antenna performance, for example, by reducing the reflection coefficient of the feeding port 213, thereby improving the signal transmission effect of the antenna device 10. Furthermore, based on the structure of the antenna device 10, by adjusting the shape and size of the first radiating portion 210 and the second radiating portion 220, the antenna device 10 can be used as a 5G antenna, and the reflection coefficient of the feeding port 213 can be significantly reduced at a frequency of 28 GHz.

[0076] It should be noted that the 5G antenna in this embodiment adopts the form of a 2×2 MIMO antenna. In other embodiments, a radiator 200 serving as the 5G antenna can be added, and the size of the radiator 200 can be further reduced, thereby further developing the 5G antenna towards the m×n (m≥4, n≥4) MIMO standard.

[0077] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. An antenna device, characterized in that: The invention comprises a dielectric substrate and a radiator provided on one side of the dielectric substrate, wherein the radiator comprises a first radiating portion and a second radiating portion, wherein the first radiating portion has a first end and a second end opposite to each other, wherein the first end is connected to the second radiating portion to form a first stepped structure, and wherein the second end is provided with a feeding port; The first end of the first radiating portion has a first stepped surface, the second radiating portion has a second stepped surface, the first stepped surface and the second stepped surface form the first stepped structure, and the second stepped surface is higher than the first stepped surface; The first end of the first radiating portion further has a third stepped surface opposite to the first stepped surface, and the second radiating portion further has a fourth stepped surface opposite to the second stepped surface, the third stepped surface and the fourth stepped surface forming another first stepped structure, and the fourth stepped surface is higher than the third stepped surface; The first radiating portion and the second radiating portion are both rectangular, with a size of L1×D1 and a size of L2×D2, wherein L1 is in the range of 1.9 to 2.1 mm, D1 is in the range of 1.2 to 1.4 mm, L2 is in the range of 2.9 to 3.1 mm, and D2 is in the range of 1.5 to 1.7 mm; The radiator further includes a third radiating portion, the third radiating portion being connected to an end of the second radiating portion away from the first radiating portion to form a second stepped structure; The first radiating portion has a first step surface, the second radiating portion has a second step surface, and the third radiating portion has a fifth step surface. The first step surface and the second step surface form the first step structure, and the fifth step surface and the second step surface form the second step structure. The heights of the fifth step surface, the second step surface, and the first step surface decrease sequentially.

2. The antenna device according to claim 1, wherein The third radiating portion is rectangular, and has a size of L3×D3, where L3 is in the range of 0.9 to 1.1 mm, and D3 is in the range of 2 to 2.2 mm.

3. A mobile terminal, characterized in that: The invention comprises the antenna device according to any one of claims 1 to 2.

4. The mobile terminal according to claim 3, wherein: The number of the radiators includes two, one of which is located in an area of ​​the dielectric substrate corresponding to the top of the mobile terminal, and the other of which is located in an area of ​​the dielectric substrate corresponding to the bottom of the mobile terminal.

5. The mobile terminal according to claim 3, wherein: The radiator is a radiating structure of a 5G antenna, and the mobile terminal includes a first radiating area for setting the radiator and a second radiating area for setting the radiating structure of a 2G / 3G / 4G antenna, and the first radiating area is located outside the second radiating area.

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