Antenna structure and electronic equipment

Abstract

The invention provides an antenna structure and electronic equipment, the antenna structure comprises a dielectric substrate, a feed unit, a radiation unit and a grounding unit, the radiation unit comprises a first radiation part, a second radiation part and a third radiation part, the first radiation part is connected with the feed unit, and the second radiation part is connected with the grounding unit; the second radiation part is connected with the first radiation part, an interval space for arranging the third radiation part is formed between the second radiation part and the first radiation part, and the third radiation part is coupled and fed by the first radiation part and the second radiation part; the grounding unit comprises a first grounding part, and the first grounding part forms a closed annular structure. When the feed unit feeds in an electric signal, the radiation unit and the grounding unit can generate a plurality of different current paths, and the current path of the radiation unit and the current path of the grounding unit resonate to form radiation signals with different wavelengths, so that the bandwidth of the antenna structure can be effectively expanded, and a good omnidirectional radiation characteristic can be provided. In addition, the third radiation part is coupled by the first radiation part and the second radiation part to generate a current path, and the frequency band width of the antenna structure is further increased.

Description

Technical Field

[0001] The present application relates to the technical field of antennas, and particularly to an antenna structure and an electronic device. Background Art

[0002] With the progress of wireless communication technology, wireless communication devices are continuously developing towards the trend of being thinner, lighter, and more compact. Consumers' requirements for communication rates are also getting higher and higher, and the requirements for electronic technology-related products are also becoming more and more precise, and the volume of electronic products is getting smaller and smaller. With the design trend of thinner, lighter, shorter, and smaller electronic products, the area of the antenna substrate is limited. How to design a smaller antenna on a limited area to adapt to the miniaturization of electronic products has become an important issue in antenna design. Summary of the Invention

[0003] In view of the above problems, it is necessary to provide an antenna structure and an electronic device.

[0004] In a first aspect of the present application, an antenna structure is provided. The antenna structure includes: a dielectric substrate including a first surface and a second surface disposed opposite to each other; a feeding unit disposed on the first surface for feeding an electrical signal into the antenna structure; a radiation unit disposed on the first surface, the radiation unit including a first radiation portion, a second radiation portion, and a third radiation portion; the first radiation portion is connected to the feeding unit to receive the electrical signal; the second radiation portion is connected to one side of the first radiation portion, and a spaced space is formed between the second radiation portion and the first radiation portion; the third radiation portion is disposed in the spaced space and is spaced from the first radiation portion and the second radiation portion, and the third radiation portion is coupled and fed by the first radiation portion and the second radiation portion; and a grounding unit disposed on the second surface for providing grounding for the antenna structure; the grounding unit includes a first grounding portion, and the first grounding portion forms a closed annular structure.

[0005] In one embodiment of the first aspect, a T-shaped slot is formed on a side of the first radiation portion away from the second radiation portion.

[0006] In one embodiment of the first aspect, the first radiating portion includes a first side, a second side, a third side, and a fourth side. The first side is parallel to the third side, the second side is parallel to the fourth side, and the first side is perpendicular to the second side and the fourth side. The second radiating portion includes a first radiating segment and a second radiating segment. One end of the first radiating segment is perpendicularly connected to the first radiating portion, and the other end of the first radiating segment is perpendicularly connected to the second radiating segment. An interval space is formed among the first radiating segment, the second radiating segment, and the first radiating portion. The first side is connected to the feeding unit, the second side is perpendicularly connected to the first radiating segment, one end of the second radiating segment is flush with the third side, and the other end of the second radiating segment extends in a direction close to the first side. One end of the third radiating portion is flush with the first side, and the other end of the third radiating portion extends in a direction close to the first radiating segment.

[0007] In one embodiment of the first aspect, the annular structure formed by the first grounding portion is disposed around the edge of the second surface of the dielectric substrate.

[0008] In one embodiment of the first aspect, the grounding unit further includes at least one second grounding portion, and the second grounding portion is disposed inside the annular structure formed by the first grounding portion and is connected to the first grounding portion.

[0009] In one embodiment of the first aspect, the grounding unit includes two second grounding portions, and the two second grounding portions are sequentially and spaced perpendicularly connected to one side of the first grounding portion, and both of the two second grounding portions are in a straight strip shape.

[0010] In one embodiment of the first aspect, the grounding unit further includes a third grounding portion, and the third grounding portion is disposed inside the annular structure formed by the first grounding portion and is perpendicularly connected to a side of the first grounding portion opposite to the second grounding portion, and the third grounding portion is in an inverted L shape.

[0011] In one embodiment of the first aspect, the grounding end of the grounding unit is disposed at a position opposite to the feeding end of the feeding unit, and the grounding end is disposed on a side of the grounding unit connected to the second grounding portion, and the second grounding portion and the third grounding portion are respectively disposed in regions on both sides of the grounding end.

[0012] In one embodiment of the first aspect, the antenna structure is configured to radiate radiation signals in a first frequency band and a second frequency band.

[0013] A second aspect of the present application provides an electronic device, and the electronic device includes the antenna structure as described above.

[0014] For the antenna structure provided in this application, the feeding unit and the radiation unit are disposed on the first surface of the dielectric substrate, and the grounding unit is disposed on the second surface of the dielectric substrate; the radiation unit includes a first radiation portion, a second radiation portion, and a third radiation portion. The first radiation portion is connected to the feeding unit to receive the electrical signal. The second radiation portion is connected to the first radiation portion and there is a spaced-apart space formed between the second radiation portion and the first radiation portion. The third radiation portion is disposed in the spaced-apart space and is spaced apart from the first radiation portion and the second radiation portion. The third radiation portion is fed by coupling with the first radiation portion and the second radiation portion; the grounding unit includes a first grounding portion, and the first grounding portion forms a closed annular structure. Since the radiation unit forms the first radiation portion, the second radiation portion, and the third radiation portion, and the grounding unit forms the first grounding portion, multiple different current paths can be generated between the radiation unit and the grounding unit. The current paths on the radiation unit and the current paths on the grounding unit resonate to generate radiation signals of different wavelengths, thereby effectively expanding the bandwidth of the antenna structure and providing good omnidirectional radiation characteristics. In addition, the third radiation portion is fed by coupling with the first radiation portion and the second radiation portion, which can further increase the bandwidth of the antenna structure. Therefore, the antenna structure of this application is small in size, compact in structure, can meet sufficient bandwidth, and has good omnidirectional radiation characteristics. Description of the Drawings

[0015] Figure 1 Schematic diagram of the structures of the radiation unit and the feeding unit of the antenna structure according to an embodiment of this application.

[0016] Figure 2 Schematic diagram of the structure of the grounding unit of the antenna structure according to an embodiment of this application.

[0017] Figure 3 Schematic diagram of the dimension labels of the dielectric substrate, the radiation unit, and the feeding unit of the antenna structure according to an embodiment of this application.

[0018] Figure 4 Schematic diagram of the dimension labels of the grounding unit of the antenna structure according to an embodiment of this application.

[0019] Figure 5 Echo loss curve diagram of the antenna structure according to an embodiment of this application.

[0020] Figure 6 3D direction pattern diagram of the antenna structure according to an embodiment of this application at an angle.

[0021] Figure 7 3D direction pattern diagram of the antenna structure according to an embodiment of this application at another angle.

[0022] Description of the Main Element Symbols

[0023] Antenna structure 100

[0024] Dielectric substrate 10

[0025] First surface 11

[0026] Second surface 12

[0027] Feeding unit 20

[0028] Radiating unit 30

[0029] First radiating part 31

[0030] T-shaped slot hole 310

[0031] First slot 3101

[0032] Second slot 3102

[0033] First side 311

[0034] Second side 312

[0035] Third side 313

[0036] Fourth side 314

[0037] Second radiating part 32

[0038] First radiating segment 321

[0039] Second radiating segment 322

[0040] Third radiating part 33

[0041] Spacer space 34

[0042] Grounding unit 40

[0043] First grounding part 41

[0044] First frame 410

[0045] Second frame 411

[0046] Third frame 412

[0047] Fourth frame 413

[0048] Second grounding part 42

[0049] First gap a

[0050] Second gap b

[0051] Third grounding part 43

[0052] First grounding segment 430

[0053] Second grounding segment 431

[0054] The following specific embodiments will further illustrate the present application in conjunction with the above-mentioned drawings. Specific Embodiments

[0055] 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, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0056] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs. The terms used in the specification of the present application herein are only for the purpose of describing specific embodiments and are not intended to limit the present application.

[0057] Some embodiments of the present application will be described in detail below with reference to the drawings. Without conflict, the embodiments and features in the following embodiments can be combined with each other.

[0058] Please refer to Figure 1 and Figure 2 , an antenna structure 100 is provided in an embodiment of the present application. It can be disposed in an electronic product with wireless communication functions (such as 3C products) to transmit and receive wireless electromagnetic waves to transmit and exchange wireless signals, thereby realizing communication between the electronic product and other electronic devices. It can be understood that the electronic product includes, but is not limited to, mobile phones, tablet computers, laptop computers, audio players, televisions, refrigerators, washing machines, etc.

[0059] Please continue to refer to Figure 1 and Figure 2 , the antenna structure 100 includes a dielectric substrate 10, a feeding unit 20, a radiation unit 30, and a grounding unit 40. The feeding unit 20, the radiation unit 30, and the grounding unit 40 are all disposed on the dielectric substrate 10.

[0060] Among them, the dielectric substrate 10 includes a first surface 11 and a second surface 12 which are oppositely arranged.

[0061] The feeding unit 20 is disposed on the first surface 11 of the dielectric substrate 10, and the feeding unit 20 is used to feed an electrical signal into the antenna structure 100.

[0062] The radiation unit 30 is also disposed on the first surface 11 of the dielectric substrate 10. The radiation unit 30 includes a first radiation portion 31, a second radiation portion 32, and a third radiation portion 33. The first radiation portion 31 is connected to the feeding unit 20 to receive the electrical signal fed by the feeding unit 20. The second radiation portion 32 is connected to one side of the first radiation portion 31, and a spaced space 34 is formed between the second radiation portion 32 and the first radiation portion 31. The third radiation portion 33 is disposed in the spaced space 34 and is spaced from the first radiation portion 31 and the second radiation portion 32. The third radiation portion 33 is fed by coupling with the first radiation portion 31 and the second radiation portion 32. Wherein, the electrical signal fed by the feeding unit 20 forms multiple current paths through the first radiation portion 31 and the second radiation portion 32, and the third radiation portion 33 generates current by coupling with the first radiation portion 31 and the second radiation portion 32.

[0063] The grounding unit 40 is disposed on the second surface 12 of the dielectric substrate 10. The grounding unit 40 is used to provide grounding for the antenna structure 100. The grounding unit 40 includes a first grounding portion 41, and the first grounding portion 41 forms a closed annular structure.

[0064] In the antenna structure 100 of the embodiment of the present application, since the radiation unit 30 forms the first radiation portion 31, the second radiation portion 32, and the third radiation portion 33, and the grounding unit 40 forms the first grounding portion 41, the radiation unit 30 and the grounding unit 40 can generate multiple different current paths. The current paths on the radiation unit 30 and the current paths on the grounding unit 40 resonate to generate radiation signals of different wavelengths, so as to effectively expand the bandwidth of the antenna structure 100 and provide good omnidirectional radiation characteristics. In addition, the third radiation portion 33 can generate a current path by coupling with the first radiation portion 31 and the second radiation portion 32, further increasing the bandwidth of the antenna structure 100. Therefore, the antenna structure 100 of the embodiment of the present application is small in volume, compact in structure, can meet sufficient bandwidth, and has good omnidirectional radiation characteristics.

[0065] In some embodiments, since the antenna structure 100 can expand the bandwidth of the antenna structure 100 through the cooperation of the first radiation portion 31, the second radiation portion 32, the third radiation portion 33, and the first grounding portion 41, the antenna structure 100 can radiate signals of one or more frequency bands.

[0066] In some embodiments, the antenna structure 100 is configured to radiate radiation signals in a first frequency band and a second frequency band. The first frequency band and the second frequency band are different frequency bands. For example, the first frequency band may be the 2.4 GHz frequency band, and the second frequency band may be the 5 GHz frequency band. That is to say, the antenna structure 100 can be used to radiate radiation signals in the 2.4 GHz frequency band and the 5 GHz frequency band. Of course, in the embodiments of the present application, there is no limitation on the first frequency band and the second frequency band, and the dimensions of each part of the antenna structure 100 can be adjusted according to actual needs to change the frequency bands that the antenna structure 100 can radiate.

[0067] As Figure 1 shown, in some embodiments, the feeding unit 20 may be a microstrip feeder, which has the advantages of small volume, light weight, easy fabrication, and integration.

[0068] In some specific examples, the feeding unit 20 may be connected to a feed source (not shown in the figure) through an SMA connector (not shown in the figure) to receive the electrical signal provided by the feed source. Of course, the SMA connector may be provided with a feed-in end and a ground end. The SMA connector may be connected to the feeding unit 20 through the feed-in end and connected to the grounding unit 40 through the ground end, so that the antenna structure 100 can feed an electrical signal into the antenna structure 100 and provide grounding through the SMA connector.

[0069] Please continue to refer to Figure 1 , in some embodiments, a T-shaped slot hole 310 is formed on one side of the first radiation portion 31 away from the second radiation portion 32.

[0070] Specifically, the T-shaped slot hole 310 may include a first slot 3101 and a second slot 3102. The first slot 3101 extends from the side close to the feeding unit 20 in a direction away from the feeding unit 20, and the second slot 3102 communicates with the first slot 3101 and extends in a direction away from the second radiation portion 32. Thus, the T-shaped slot hole 310 is formed by the first slot 3101 and the second slot 3102.

[0071] Specifically, the first radiation portion 31 may be formed by opening a T-shaped slot hole 310 in a rectangular sheet conductor. The first radiation portion 31 includes a first side 311, a second side 312, a third side 313, and a fourth side 314. The first side 311 is parallel to the third side 313, the second side 312 is parallel to the fourth side 314, and the first side 311 is perpendicular to the second side 312 and the fourth side 314.

[0072] The first side 311 of the first radiation portion 31 can be connected to the feeding unit 20. The first slot 3101 can extend from the first side 311 towards the third side 313, and the second slot 3102 extends towards the fourth side 314 and penetrates through the fourth side 314. Thus, the second slot 3102 divides the area between the first slot 3101 and the fourth side 314 into two segments. The first slot 3101 and the second slot 3102 make the first radiation portion 31 in a C shape.

[0073] Please continue to refer to Figure 1 , in some embodiments, the second radiation portion 32 includes a first radiation segment 321 and a second radiation segment 322. One end of the first radiation segment 321 is vertically connected to one side of the first radiation portion 31, the other end of the first radiation segment 321 is vertically connected to the second radiation segment 322, and an interval space 34 is formed between the first radiation segment 321, the second radiation segment 322 and the first radiation portion 31.

[0074] Specifically, when the first radiation portion 31 is formed by opening a T-shaped slot hole 310 in a rectangular sheet conductor, the first radiation segment 321 is vertically connected to the second side 312 of the first radiation portion 31. One end of the second radiation segment 322 is flush with the third side 313 of the first radiation portion 31, and the other end of the second radiation segment 322 extends towards the first side 311 of the first radiation portion 31, so that the second radiation segment 322 is spaced from the second side 312 of the first radiation portion 31. Thus, an interval space 34 can be formed between the first radiation segment 321, the second radiation segment 322 and the second side 312 of the first radiation portion 31. Among them, the second radiation portion 32 can be in a T shape through the connection of the first radiation segment 321 and the second radiation segment 322.

[0075] Furthermore, one end of the third radiation portion 33 can be flush with the first side 311 of the first radiation portion 31, and the other end of the third radiation portion 33 extends towards the first radiation segment 321. Of course, there is an interval between the other end of the third radiation portion 33 and the first radiation segment 321. Among them, the first radiation segment 321, the second radiation segment 322 and the third radiation portion 33 can be straight strip-shaped conductor sheets.

[0076] Of course, the shape of the first radiation portion 31 is not limited to a rectangular sheet conductor, and can also be a parallelogram, a rhombus, a square, a trapezoid, a polygon, etc.

[0077] Please refer to Figure 2 , in some embodiments, the annular structure formed by the first grounding portion 41 can be arranged along the edge of the second surface 12 of the dielectric substrate 10.

[0078] In some embodiments, the first grounding portion 41 includes a first frame 410, a second frame 411, a third frame 412, and a fourth frame 413 that are disposed around the edge of the second surface 12. The first frame 410 is parallel to the third frame 412, the second frame 411 is parallel to the fourth frame 413, and the first frame 410 is connected to the second frame 411 and the fourth frame 413. Thus, the closed annular structure formed by the first grounding portion 41 is in the shape of a parallelogram.

[0079] Further, the dielectric substrate 10 can be rectangular. Thus, the first frame 410 is perpendicular to the second frame 411 and the fourth frame 413, and the closed annular structure formed by the first grounding portion 41 is rectangular.

[0080] Even further, the dielectric substrate 10 can be square. Thus, the lengths of the first frame 410, the second frame 411, the third frame 412, and the fourth frame 413 are the same, and the closed annular structure formed by the first grounding portion 41 is square.

[0081] Further, the grounding unit 40 can further include at least one second grounding portion 42. The second grounding portion 42 is disposed inside the annular structure formed by the first grounding portion 41 and is connected to the first grounding portion 41.

[0082] In some specific examples, as Figure 2 shown, the grounding unit 40 includes two second grounding portions 42. The two second grounding portions 42 are vertically connected to one side of the first grounding portion 41 at intervals in sequence, and both of the two second grounding portions 42 are in a straight strip shape. For example, the two second grounding portions 42 can be vertically connected to the first frame 410 of the first grounding portion 41 at intervals in sequence.

[0083] In some embodiments, the lengths and widths of the two second grounding portions 42 can be the same.

[0084] In some specific examples, a first gap a is formed between one of the second grounding portions 42 and the second frame 411, and a second gap b is formed between the two second grounding portions 42. In some specific examples, the width of the second gap b can be greater than the width of the first gap a.

[0085] Please refer to Figure 2 again. The grounding unit 40 can further include a third grounding portion 43. The third grounding portion 43 is also disposed inside the annular structure formed by the first grounding portion 41, is vertically connected to the side of the first grounding portion 41 opposite to the second grounding portion 42, and the third grounding portion 43 is in an inverted L shape.

[0086] Further, the third grounding portion 43 can be vertically connected to the third frame 412 of the first grounding portion 41.

[0087] Specifically, the third grounding portion 43 may include a first grounding segment 430 and a second grounding segment 431. The first grounding segment 430 is vertically connected to the third side frame 412 and extends in a direction close to the first side frame 410. The second grounding segment 431 is vertically connected to the end of the first grounding segment 430 and extends in a direction close to the second side frame 411. Thus, the shape of the third grounding portion 43 is an inverted L shape.

[0088] When the dielectric substrate 10 is rectangular, the feeding unit 20 may be in a straight strip shape, and the midline of the feeding unit 20 coincides with the midline of the dielectric substrate 10.

[0089] In some embodiments, the grounding end of the grounding unit 40 is disposed at a position opposite to the feeding end of the feeding unit 20 on the first side frame 410, and the grounding end is disposed on the side where the grounding unit 40 is connected to the second grounding portion 42. The second grounding portion 42 and the third grounding portion 43 are respectively disposed in the areas on both sides of the grounding end.

[0090] In some embodiments, the grounding end may be farther from the second side frame 411 than the two second grounding portions.

[0091] Specifically, one end of the feeding unit 20 away from the radiation unit 30 may be used as the feeding end, and the feeding end may be disposed at the edge of the first surface 11 of the dielectric substrate 10 corresponding to the first side frame 410. Based on this, the grounding end may be disposed in the middle of the first side frame 410. More specifically, the perpendicular line of the first side frame 410 passing through the grounding end may divide the inside of the first grounding portion 41 into a first area and a second area. The two second grounding portions 42 may be disposed in the first area, and the third grounding portion 43 may be disposed in the second area.

[0092] In some specific examples, the overall dimensions of the antenna structure 100 are as Figure 3 、 Figure 4 and Table 1 below:

[0093] <![CDATA[L s > <![CDATA[W s > <![CDATA[L f > <![CDATA[W f > 37 37 5 4.5 <![CDATA[W p > <![CDATA[L p > g <![CDATA[L 1 > 10.5 16 1 14 <![CDATA[L g > <![CDATA[L i > <![CDATA[W i > <![CDATA[S 1 > 10.5 32 32 1 <![CDATA[S 2 > <![CDATA[L 2 > <![CDATA[S 3 > <![CDATA[S 4 > 3 18 4 6

[0094] Among them, the unit of each dimension is: mm. Combining Figure 3 、 Figure 4 and Table 1, it can be known that in the antenna structure 100, the length L s of the dielectric substrate 10 is 37 mm, and the width W s of the dielectric substrate 10 is 37 mm. The length L f of the feeding unit 20 is 5 mm, and the width W f of the feeding unit 20 is 4.5 mm.

[0095] The width W p of the first radiation portion 31 is 10.5 mm, and the length L pThe width of the first slot 3101 is 16 mm, and the width g of the second slot 3102 is 1 mm.

[0096] The length L of the second radiation portion 32 1 is 14 mm, and the length L of the third radiation portion 33 g is 10.5 mm.

[0097] The length W of the inner sides of the first frame 410 and the third frame 412 i is 32 mm, and the length L of the inner sides of the second frame 411 and the fourth frame 413 i is also 32 mm. Thus, it can be known that the widths of the first frame 410, the second frame 411, the third frame 412, and the fourth frame 413 are all 2.5 mm.

[0098] The width S of the first gap a formed between one of the second grounding portions 42 and the second frame 411 1 is 1 mm, and the width S of the second gap b formed between the two second grounding portions 42 2 is 3 mm. The length L of the third grounding portion 43 2 is 18 mm, the width S of the second grounding section 431 3 is 4 mm, and the length S of the second grounding section 431 4 is 6 mm. Thus, it can be known that the length of the first grounding section 430 is 18 mm.

[0099] Please refer to Figure 5 , Figure 5 , which shows the echo loss curve diagram obtained by simulating the antenna structure 100 in this example in the simulation software. As Figure 5 shown, the antenna structure 100 has two center frequencies, which are 2.442 GHz

[0100] (M1) and 5.520 GHz (M2) respectively. The echo loss of the antenna structure 100 at the center frequency of 2.442 GHz and its nearby frequencies is less than -6 dB, that is, the antenna structure 100 can be applied to the 2.4 GHz band (2.4 - 2.483 GHz). The echo loss of the antenna structure 100 is less than -10 dB in the frequency range of 4.820 GHz - 6 GHz. Therefore, the antenna structure 100 can also be applied to the 5 GHz band (5 GHz - 6 GHz). Therefore, the antenna structure 100 in this example can be applied to both the 2.4 GHz band and the 5 GHz band simultaneously, and can realize the miniaturization of the antenna structure 100 and cover the communication signals of the two bands.

[0101] Please refer to Figure 6 and Figure 7 , Figure 6 and Figure 7The 3D radiation pattern diagrams of the antenna structure 100 of this example are shown at different angles in a rectangular coordinate system. Combining Figure 6 and Figure 7 it can be seen that the antenna structure 100 of this example has good radiation characteristics in multiple directions, that is, the antenna structure 100 of this example can provide good omnidirectional radiation characteristics, meeting the design requirements of the antenna structure 100.

[0102] Therefore, the antenna structure 100 of the embodiment of the present application is compact in structure and small in volume, can be applied to the 2.4 GHz band and the 5 GHz band, and has the characteristics of good omnidirectional radiation characteristics.

[0103] The embodiment of the present application also provides an electronic device, including the antenna structure 100 as described above.

[0104] The above embodiments are only used to illustrate the technical solutions of the present application and not to limit them. Although the present application has been described in detail with reference to the above preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present application can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present application. Those skilled in the art can also make other changes within the spirit of the present application for use in the design of the present application, as long as they do not deviate from the technical effects of the present application. These changes made in accordance with the spirit of the present application should all be included within the scope claimed by the present application.

Claims

1. An antenna structure, characterized in that, the antenna structure comprises: a dielectric substrate, the dielectric substrate including a first surface and a second surface arranged oppositely; a feeding unit, the feeding unit being arranged on the first surface, and the feeding unit being used for feeding an electrical signal into the antenna structure; a radiation unit, the radiation unit being arranged on the first surface, the radiation unit including a first radiation portion, a second radiation portion and a third radiation portion; the first radiation portion is connected to the feeding unit to receive the electrical signal; the second radiation portion is connected to one side of the first radiation portion, and an interval space is formed between the second radiation portion and the first radiation portion; the third radiation portion is arranged in the interval space and is spaced from the first radiation portion and the second radiation portion, and the third radiation portion is coupled and fed by the first radiation portion and the second radiation portion; and a grounding unit, the grounding unit being arranged on the second surface, the grounding unit being used for providing grounding for the antenna structure; the grounding unit includes a first grounding portion, and the first grounding portion forms a closed annular structure.

2. The antenna structure according to claim 1, characterized in that, a T-shaped slot is formed on a side of the first radiation portion away from the second radiation portion.

3. The antenna structure according to claim 1 or 2, characterized in that, the first radiation portion includes a first side, a second side, a third side and a fourth side, the first side is arranged parallel to the third side, the second side is arranged parallel to the fourth side, and the first side is arranged perpendicular to the second side and the fourth side; the second radiation portion includes a first radiation segment and a second radiation segment, one end of the first radiation segment is vertically connected to the first radiation portion, the other end of the first radiation segment is vertically connected to the second radiation segment, and the interval space is formed between the first radiation segment, the second radiation segment and the first radiation portion; the first side is connected to the feeding unit, the second side is vertically connected to the first radiation segment, one end of the second radiation segment is flush with the third side, and the other end of the second radiation segment extends towards the direction close to the first side; one end of the third radiation portion is flush with the first side, and the other end of the third radiation portion extends towards the direction close to the first radiation segment.

4. The antenna structure according to claim 1, characterized in that, the annular structure formed by the first grounding portion is arranged to surround along the edge of the second surface of the dielectric substrate.

5. The antenna structure according to claim 4, characterized in that, the grounding unit further includes at least one second grounding portion, and the second grounding portion is arranged inside the annular structure formed by the first grounding portion and is connected to the first grounding portion.

6. The antenna structure according to claim 5, characterized in that, the grounding unit includes two second grounding portions, the two second grounding portions are vertically connected to one side of the first grounding portion at intervals in sequence, and the two second grounding portions are both in a straight strip shape.

7. The antenna structure according to claim 5 or 6, characterized in that, The grounding unit further includes a third grounding portion, which is disposed inside the annular structure formed by the first grounding portion and is vertically connected to a side of the first grounding portion opposite to the second grounding portion. The third grounding portion is in an inverted L shape.

8. The antenna structure according to claim 7, wherein, a grounding end of the grounding unit is disposed at a position opposite to a feeding end of the feeding unit, and the grounding end is disposed on a side where the grounding unit is connected to the second grounding portion. The second grounding portion and the third grounding portion are respectively disposed in regions on both sides of the grounding end.

9. The antenna structure according to claim 1, wherein, the antenna structure is configured to radiate radiation signals in a first frequency band and a second frequency band.

10. An electronic device, wherein, the electronic device includes the antenna structure according to any one of claims 1 to 9.

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