Antenna structure and wireless communication device having the same

Abstract

The present invention provides an antenna structure and a wireless communication device having the antenna structure. The antenna structure includes: a dielectric substrate and a plurality of radiating units, each radiating unit including a first radiator and a second radiator, the first radiator being arranged on the first surface of the dielectric substrate, the first radiator including a first radiating portion and a feeding point, the feeding point being electrically connected to the first radiating portion for feeding a signal into the radiating unit, the second radiator being arranged on the second surface of the dielectric substrate and being symmetrical with the first radiator with respect to the dielectric substrate, the second radiator including a second radiating portion and a grounding portion, the grounding portion being electrically connected to the second radiating portion for providing grounding for the radiating unit. The antenna structure provided by the present invention has multiple frequency bands, good radiation efficiency, and strong isolation performance, meeting the antenna working design requirements.

Description

Technical Field

[0001] The present invention relates to an antenna structure with multiple frequency bands and high isolation, and a wireless communication device with the antenna structure. Background Art

[0002] With the rapid development of wireless communications, people's requirements for wireless communications are becoming increasingly higher. The application of multi-antenna technology can improve the transmission efficiency and reliability of wireless communications. A Multiple Input Multiple Output (MIMO) system uses a multi-antenna architecture on its transmitter to transmit signals in different frequency bands, and also uses a multi-antenna architecture on the receiver to receive signals in different frequency bands. However, the various signals transmitted or received by a multi-antenna architecture often interfere with each other, and the multi-antenna structure also occupies a large area. Therefore, how to expand the bandwidth and effectively improve antenna isolation within a limited area is a key issue facing MIMO antenna design. Summary of the Invention

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

[0004] A first aspect of the present invention provides an antenna structure, comprising: a dielectric substrate and a plurality of radiating units, each radiating unit comprising a first radiator and a second radiator, wherein the first radiator is disposed on a first surface of the dielectric substrate, the first radiator comprising a first radiating portion and a feeding point, the feeding point being electrically connected to the first radiating portion for feeding a signal into the radiating unit, the second radiator being disposed on a second surface of the dielectric substrate and being symmetrical with the first radiator with respect to the dielectric substrate, the second radiator comprising a second radiating portion and a grounding portion, the grounding portion being electrically connected to the second radiating portion for providing grounding for the radiating unit.

[0005] Furthermore, the first radiator also includes a first isolation portion, and the second radiator also includes a second isolation portion. The first isolation portion is spaced apart from the first radiating portion and is wound around the outer periphery of the first radiating portion. The second isolation portion is spaced apart from the second radiating portion and is wound around the outer periphery of the second radiating portion.

[0006] Furthermore, the first radiating portion includes four resonant arms, each of the resonant arms includes a first resonant sub-arm and a second resonant sub-arm, one end of the second resonant sub-arm is vertically connected to one end of the first resonant sub-arm, and the other end of each second resonant sub-arm away from the first resonant sub-arm is connected to each other, and the feeding point is arranged at the connection of each second resonant sub-arm.

[0007] Furthermore, each second resonator arm is perpendicular to the other two adjacent second resonator arms, two of the second resonator arms of the first radiating portion are arranged in a diagonal direction of the dielectric substrate, and one end of the first resonator arm away from the second resonator arm is facing the same side in a counterclockwise direction or a clockwise direction.

[0008] Furthermore, the number of the first isolation portions is four, and each of the first isolation portions is disposed on a side of the first resonator arm away from the second resonator arm, and is spaced apart and parallel to the first resonator arm.

[0009] Furthermore, the length of the first resonator arm is smaller than the length of the second resonator arm, the width of the first resonator arm is larger than the width of the second resonator arm, and the length of the first isolation portion is substantially equal to the length of the first resonator arm.

[0010] Furthermore, the second radiator has the same structure as the first radiator.

[0011] Furthermore, the number of the plurality of radiation units is four, the four radiation units are respectively arranged at the four corners of the dielectric substrate, and the two radiation units located in the same diagonal direction on the dielectric substrate are symmetrical to each other about the center point of the dielectric substrate.

[0012] Furthermore, the antenna structure further includes a metal reflector plate, and the metal reflector plate is arranged relative to and spaced from the second surface.

[0013] Another aspect of the present invention provides a wireless communication device, comprising the antenna structure as described in any one of the above items.

[0014] The antenna structure provided by the present invention effectively expands the bandwidth of the antenna structure without increasing its area by disposing a first radiator and a second radiator on a dielectric substrate. The symmetry of the first radiator 211 and the second radiator 212 with respect to the dielectric substrate not only effectively expands the bandwidth of the antenna structure 100 but also ensures excellent omnidirectionality and symmetry. Furthermore, the first and second radiators are provided with corresponding isolation portions, effectively improving the isolation of the antenna structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 FIG. 1 is a perspective schematic diagram of an antenna structure according to a preferred embodiment of the present invention.

[0016] Figure 2 For the Figure 1 A cross-sectional view of the antenna structure along line II-II is shown.

[0017] Figure 3 for Figure 1 A schematic diagram of the antenna structure shown at a first angle.

[0018] Figure 4 for Figure 1 A schematic diagram of the antenna structure shown at a second angle.

[0019] Figure 5 for Figure 1 The S12 parameter (isolation) curves of the first radiating element and the other three radiating elements in the antenna structure shown are when operating at 5.15 GHz to 7.25 GHz.

[0020] Figure 6 for Figure 1 The S12 parameter (isolation) curves of the second radiating element and the other three radiating elements in the antenna structure shown are when operating at 5.15 GHz to 7.25 GHz.

[0021] Figure 7 for Figure 1 The S12 parameter (isolation) curves of the third radiating element in the antenna structure shown are respectively compared with the other three radiating elements when operating at 5.15 GHz to 7.25 GHz.

[0022] Figure 8 for Figure 1 The S12 parameter (isolation) curves of the fourth radiating element and the other three radiating elements in the antenna structure shown are when operating at 5.15 GHz to 7.25 GHz.

[0023] Figure 9 for Figure 1 The symmetrical radiation patterns of the first radiation unit in the antenna structure shown are shown when the resonant frequencies are 5 GHz, 6 GHz and 7 GHz respectively.

[0024] Figure 10 for Figure 1 The symmetrical radiation patterns of the second radiation unit in the antenna structure shown are shown when the resonant frequencies are 5 GHz, 6 GHz and 7 GHz respectively.

[0025] Figure 11 for Figure 1 The symmetrical radiation patterns of the third radiation unit in the antenna structure shown are shown when the resonant frequencies are 5 GHz, 6 GHz and 7 GHz respectively.

[0026] Figure 12 for Figure 1 The symmetrical radiation patterns of the fourth radiation unit in the antenna structure shown are shown when the resonant frequencies are 5 GHz, 6 GHz and 7 GHz respectively.

[0027] Figure 13 for Figure 1 The omnidirectional radiation patterns of the first radiation unit in the antenna structure shown are when the resonant frequencies are 5 GHz, 6 GHz and 7 GHz respectively.

[0028] Figure 14 for Figure 1 The omnidirectional radiation patterns of the second radiating unit in the antenna structure shown are when the resonant frequencies are 5 GHz, 6 GHz and 7 GHz respectively.

[0029] Figure 15 for Figure 1 The omnidirectional radiation patterns of the third radiating element in the antenna structure shown are when the resonant frequencies are 5 GHz, 6 GHz and 7 GHz respectively.

[0030] Figure 16 for Figure 1 The omnidirectional radiation patterns of the fourth radiation unit in the antenna structure shown are when the resonant frequencies are 5 GHz, 6 GHz and 7 GHz respectively.

[0031] Description of main component symbols

[0032] Antenna structure 100

[0033] Dielectric substrate 10

[0034] First surface 101

[0035] Second surface 102

[0036] Through hole 11

[0037] Radiation unit 20

[0038] The first radiation unit 21

[0039] First radiator 211

[0040] First radiation portion 213

[0041] Feed point 214

[0042] First isolation portion 215

[0043] Resonant arm 216

[0044] First resonator arm 217

[0045] The second resonator arm 218

[0046] Second radiator 212

[0047] The second radiation portion 25

[0048] Second isolation portion 26

[0049] Ground portion 27

[0050] The second radiation unit 22

[0051] The third radiation unit 23

[0052] Fourth radiation unit 24

[0053] Metal reflector 30

[0054] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0055] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0056] It should be noted that when an element is referred to as being "electrically connected" to another element, it may be directly on the other component or there may be an intermediate element. When an element is considered to be "electrically connected" to another element, it may be a contact connection, for example, a wire connection, or a contactless connection, for example, a contactless coupling.

[0057] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used in this specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0058] In this document, unless otherwise expressly specified and limited, directional words such as the terms "above", "below", "upper end", "lower end", "lower surface", "clockwise", "counterclockwise", "left", "right", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of narrating this document and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and cannot be understood as limiting the specific scope of protection of this application.

[0059] In this document, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "below," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "above," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0060] In this document, unless otherwise expressly specified or limited, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features. Therefore, the definition of "first" or "second" may explicitly or implicitly include one or more of such features.

[0061] The following embodiments of the present invention are described in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0062] Please also refer to Figure 1 and Figure 2 A preferred embodiment of the present invention provides an antenna structure 100 that can be installed in a wireless communication device (not shown) to transmit and receive radio waves to communicate and exchange wireless signals. The wireless communication device can be, but is not limited to, customer premises equipment (CPE), a router, and a set-top box.

[0063] The antenna structure 100 includes a dielectric substrate 10, a plurality of radiating elements 20, and a metal reflector 30. The antenna structure 100 can be attached to the housing of the wireless communication device using glue or other methods. The plurality of radiating elements 20 are disposed on the surface of the dielectric substrate 10, and the metal reflector 30 is spaced apart from the dielectric substrate 10.

[0064] The dielectric substrate 10 is in the form of a sheet, including a first surface 101 and a second surface 102. The dielectric substrate 10 can be a metal substrate, a ceramic substrate, or an organic substrate. In this embodiment, the dielectric substrate 10 is a generally square sheet. The dielectric substrate 10 is made of a fiberglass board (FR-4 board), which is a common organic substrate.

[0065] See also Figure 3In this embodiment, the number of the plurality of radiating units 20 is four, and the four radiating units 20 are respectively disposed at the four corners of the dielectric substrate 10. The two radiating units 20 located on the same diagonal direction of the dielectric substrate 10 are symmetrical with respect to the center point of the dielectric substrate 10.

[0066] In this embodiment, the four radiating elements 20 include a first radiating element 21, a second radiating element 22, a third radiating element 23, and a fourth radiating element 24. Thus, it can be understood that the antenna structure 100 is a multiple-input multiple-output antenna. The first radiating element 21 and the second radiating element 22 are respectively disposed at the upper right corner and lower right corner of the dielectric substrate 10, while the third radiating element 23 and the fourth radiating element 24 are respectively disposed at the lower left corner and upper left corner of the dielectric substrate 10. Thus, the first radiating element 21 and the third radiating element 23 are symmetrical about the center point of the dielectric substrate 10 in one diagonal direction of the dielectric substrate 10; the second radiating element 22 and the fourth radiating element 24 are symmetrical about the center point of the dielectric substrate 10 in another diagonal direction of the dielectric substrate 10. The first radiating element 21, the second radiating element 22, the third radiating element 23, and the fourth radiating element 24 have the same structure. The structure of each radiating element 20 will be described below, taking the first radiating element 21 as an example.

[0067] Please also refer to Figure 3 and Figure 4 The first radiation unit 21 includes a first radiator 211 and a second radiator 212. The first radiator 211 is disposed on the first surface 101 of the dielectric substrate 10, and the second radiator 212 is disposed on the second surface 102 of the dielectric substrate 10. The first radiator 211 and the second radiator 212 are symmetrical with respect to the dielectric substrate 10.

[0068] The first radiator 211 includes a first radiating portion 213, a feeding point 214, and a first isolation portion 215. The first isolation portion 215 is spaced apart from the first radiating portion 213 and surrounds the first radiating portion 213 to improve the isolation of the antenna structure 100. The feeding point 214 is electrically connected to the first radiating portion 213 to feed a signal to the first radiating portion 213.

[0069] In this embodiment, the first radiating portion 213 includes four resonant arms 216. Each resonant arm 216 includes a first resonator arm 217 and a second resonator arm 218. One end of the second resonator arm 218 is perpendicularly connected to one end of the first resonator arm 217. Thus, the resonant arm 216 is generally in an inverted L-shape. The other end of each second resonator arm 218, which is away from the first resonator arm 217, is interconnected, and each second resonator arm 218 is perpendicular to the other two adjacent second resonator arms 218. Furthermore, two of the second resonator arms 218 of the first radiating portion 213 are disposed in a diagonal direction of the dielectric substrate 10. Thus, the four second resonator arms 218 are interconnected, generally forming an X-shape. The end of each first resonator arm 217, which is away from the second resonator arm 218, faces the same side in either a counterclockwise or clockwise direction. In this way, any one of the four resonant arms 216 can be rotated 90 degrees clockwise or 90 degrees counterclockwise to obtain the adjacent resonant arm 216 , that is, the first radiating portion 213 is substantially in a swastika shape.

[0070] In one embodiment, the length H1 of the first resonator arm 217 is less than the length H2 of the second resonator arm 218, and the width L1 of the first resonator arm 217 is greater than the width L2 of the second resonator arm 218. For example, in one embodiment, the length of the first resonator arm 217 is 7.5 mm, and the width of the first resonator arm 217 is 3 mm. The length of the second resonator arm 218 is 10 mm, and the width of the second resonator arm 218 is 1.5 mm.

[0071] The feeding point 214 is located at the center of the first radiating portion 213, i.e., at the connection point of the four second resonator arms 218. The feeding point 214 can be electrically connected to a feeding source via a feeding line (not shown) to feed current into the first radiating element 21.

[0072] In one embodiment, there are four first isolating portions 215. Each first isolating portion 215 is a generally elliptical sheet, and the length H3 of the first isolating portion 215 is approximately equal to the length H1 of the first resonator arm 217. The four first isolating portions 215 are arranged around the periphery of the four resonator arms 216. Furthermore, the first isolating portions 215 are arranged on a side of the first resonator arm 217 away from the second resonator arm 218, and are spaced parallel to and spaced from the first resonator arm 217.

[0073] See also Figure 4The second radiator 212 is disposed on the second surface 102 of the dielectric substrate 10 at a position corresponding to the first radiator 211. The structure of the second radiator 212 is symmetrical to that of the first radiator 211 with respect to the dielectric substrate 10. Thus, the structure of the second radiator 212 is identical to that of the first radiator 211. The difference between the second radiator 212 and the first radiator 211 is that the second radiator 212 is provided with a grounding portion 27 corresponding to the feed point 214 of the first radiator 211. Therefore, it can be understood that the second radiator 212 is provided with a corresponding second radiating portion 25, a second isolating portion 26, and the grounding portion 27. The second isolating portion 26 is spaced apart from the second radiating portion 25 and surrounds the outer periphery of the second radiating portion 25 to improve the isolation of the antenna structure 100. The grounding portion 27 is generally a square plate. It is electrically connected to the second radiating portion 25. The grounding portion 27 can be electrically connected to a ground point on a circuit board (not shown) to provide grounding for the first radiating element 21.

[0074] It is understood that the first radiator 211 and the second radiator 212 are formed by coating the first surface 101 and the second surface 102 of the dielectric substrate 10 with metal material, respectively. For example, the first surface 101 and the second surface 102 of the dielectric substrate 10 are coated with copper, respectively, to form the first radiator 211 and the second radiator 212. The dielectric substrate 10 is also provided with vias (not shown) corresponding to the feed point 214 and the ground portion 27 to electrically connect the feed point 214 and the ground portion 27.

[0075] It can be understood that, as described above, the structures of the second radiating unit 22, the third radiating unit 23, and the fourth radiating unit 24 are the same as or similar to those of the first radiating unit 21, and can be obtained by corresponding translation, rotation, or symmetric mapping of the first radiating unit 21. That is, the second radiating unit 22, the third radiating unit 23, and the fourth radiating unit 24 are respectively provided with corresponding first radiators and second radiators, which are not further described here.

[0076] Please refer again Figure 1 and Figure 2 The metal reflector 30 is spaced apart and arranged parallel to the dielectric substrate 10. Specifically, the metal reflector 30 is spaced apart from the second surface 102 of the dielectric substrate 10. In this embodiment, the distance H4 between the metal reflector 30 and the dielectric substrate 10 is greater than or equal to 11 mm.

[0077] It is understood that the dielectric substrate 10 and the metal reflector 30 can be connected by a connector (not shown). For example, in one embodiment, the dielectric substrate 10 is provided with a through hole 11 (see FIG. Figure 3 One end of the connector is inserted into the through hole 11, and the other end is fixedly connected to the dielectric substrate 10. It can be understood that the material of the connector is an insulating material, such as a plastic material.

[0078] It can be understood that when current is fed into the feeding point 214 of each first radiator 211, the current flows through the first radiating portion 213, and then flows through the radiating portion of the second radiator 212 through the grounding portion 27, and is grounded through the grounding portion 27 to jointly excite a working mode to generate a radiation signal of the corresponding working frequency band.

[0079] In this embodiment, the operating modes include Wi-Fi 5G operating mode, Wi-Fi 6G operating mode, sub-6G operating mode, and 7.1-7.25 GHz operating mode. The operating frequency bands include 5.15-5.85 GHz, 6.1-6.8 GHz, and 7.1-7.25 GHz.

[0080] When the antenna structure 100 operates in the operating frequency band, the standing wave ratio is less than 2.5 dB, and the radiation efficiency can reach 80%, which has good radiation efficiency and can meet the antenna working design requirements.

[0081] See also Figures 5 to 8 , Figure 5 1 is a graph showing the S12 parameter (isolation) of the first radiation unit 21 and the other three radiation units in the antenna structure 100 of the present invention when operating at 5.15 GHz to 7.25 GHz; Figure 6 1 is a graph showing the S12 parameter (isolation) when the second radiating element 22 and the other three radiating elements in the antenna structure 100 of the present invention operate at 5.15 GHz to 7.25 GHz; Figure 7 1 is a graph showing the S12 parameter (isolation) of the third radiating element 23 and the other three radiating elements in the antenna structure 100 of the present invention when operating at 5.15 GHz to 7.25 GHz; Figure 8 The S12 parameter (isolation) curves of the fourth radiation unit 24 and the other three radiation units in the antenna structure 100 of the present invention when operating at 5.15 GHz to 7.25 GHz are shown. Figure 5 The curve S51 in FIG. 5 represents the S12 value between the first radiation unit 21 and the second radiation unit 22 when operating at 5.15 GHz to 7.25 GHz; Figure 5The curve S52 in FIG. 5 represents the S12 value between the first radiation element 21 and the third radiation element 23 when operating at 5.15 GHz to 7.25 GHz; Figure 5 The curve S53 in FIG represents the S12 value between the first radiation unit 21 and the fourth radiation unit 24 when operating at 5.15 GHz to 7.25 GHz. It can be understood that Figure 6 The curve S61 in FIG. 5 represents the S12 value between the second radiation unit 22 and the first radiation unit 21 when operating at 5.15 GHz to 7.25 GHz; Figure 7 The curve S71 in FIG. 1 represents the S12 value between the third radiation element 23 and the first radiation element 21 when operating at 5.15 GHz to 7.25 GHz; Figure 8 The curve S81 in FIG represents the S12 value between the fourth radiation unit 24 and the first radiation unit 21 when operating at 5.15 GHz to 7.25 GHz. By analogy, we can get Figures 6 to 8 The meanings of the other curves are not described here.

[0082] Depend on Figures 5 to 8 It can be seen that each radiation unit in the antenna structure 100 can operate in the above-mentioned 5.15-5.85 GHz, 6.1-6.8 GHz and 7.1-7.25 GHz frequency bands, and their isolation is below -20 dB, with high isolation performance.

[0083] Please also refer to Figures 9 to 16 , Figure 9 symmetrical radiation patterns when the resonant frequencies of the first radiation unit 21 in the antenna structure 100 of the present invention are 5 GHz, 6 GHz, and 7 GHz, respectively; Figure 10 symmetrical radiation patterns of the second radiation unit 22 in the antenna structure 100 of the present invention when the resonant frequencies are 5 GHz, 6 GHz, and 7 GHz respectively; Figure 11 symmetrical radiation patterns when the resonant frequencies of the third radiation unit 23 in the antenna structure 100 of the present invention are 5 GHz, 6 GHz, and 7 GHz, respectively; Figure 12 1 and 2 are symmetrical radiation patterns when the resonant frequencies of the fourth radiation unit 24 in the antenna structure 100 of the present invention are 5 GHz, 6 GHz, and 7 GHz, respectively. Figure 13 for Figure 1 The omnidirectional radiation patterns of the first radiation unit 21 in the antenna structure 100 are shown when the resonant frequencies are 5 GHz, 6 GHz and 7 GHz respectively; Figure 14 for Figure 1 The omnidirectional radiation patterns of the second radiation unit 22 in the antenna structure 100 are shown when the resonant frequencies are 5 GHz, 6 GHz and 7 GHz respectively; Figure 15 for Figure 1 The omnidirectional radiation patterns of the third radiation unit 23 in the antenna structure 100 are shown when the resonant frequencies are 5 GHz, 6 GHz and 7 GHz respectively; Figure 16 for Figure 1 The omnidirectional radiation patterns of the fourth radiation unit 24 in the antenna structure 100 are shown when the resonant frequencies are 5 GHz, 6 GHz and 7 GHz respectively.

[0084] Depend on Figures 9 to 16 It can be seen that when the resonant frequencies of the antenna structure 100 are 5 GHz, 6 GHz, and 7 GHz, respectively, each radiating unit in the antenna structure 100 is symmetrical and omnidirectional in the horizontal direction.

[0085] Clearly, the antenna structure 100 of the present invention, by providing a first radiator 211 and a second radiator 212 on a dielectric substrate, can effectively expand the bandwidth of the antenna structure 100 without increasing the area of ​​the antenna structure 100. The symmetry of the first radiator 211 and the second radiator 212 with respect to the dielectric substrate not only effectively expands the bandwidth of the antenna structure 100 but also ensures excellent omnidirectionality and symmetry. Furthermore, the first and second radiators 211, 212 are provided with corresponding first and second isolating portions 215, 26, effectively improving the isolation of the antenna structure 100.

[0086] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the above preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent replacements of the technical solutions of the present invention may be made without departing from the spirit and scope of the technical solutions of the present invention. Those skilled in the art may also make other changes within the spirit of the present invention and apply them to the design of the present invention, as long as they do not deviate from the technical effects of the present invention. These changes made in accordance with the spirit of the present invention should all be included in the scope of protection claimed by the present invention.

Claims

1. An antenna structure, characterized in that: The antenna structure includes: a dielectric substrate and a plurality of radiating units, each radiating unit including a first radiator and a second radiator, the first radiator being arranged on the first surface of the dielectric substrate, the first radiator including a first radiating portion and a feeding point, the feeding point being electrically connected to the first radiating portion for feeding a signal into the radiating unit, the second radiator being arranged on the second surface of the dielectric substrate and being symmetrical with the first radiator with respect to the dielectric substrate, the second radiator including a second radiating portion and a grounding portion, the grounding portion being electrically connected to the second radiating portion for providing grounding for the radiating unit; the first radiator further includes a first isolating portion, the second radiator further includes a second isolating portion, the first isolating portion is spaced apart from the first radiating portion and is arranged around the periphery of the first radiating portion, the second isolating portion is spaced apart from the second radiating portion and is arranged around the periphery of the second radiating portion.

2. The antenna structure according to claim 1, wherein: The first radiating portion includes four resonant arms, each of the resonant arms includes a first resonator arm and a second resonator arm, one end of the second resonator arm is vertically connected to one end of the first resonator arm, and the other end of each second resonator arm away from the first resonator arm is connected to each other, and the feeding point is set at the connection of each second resonator arm.

3. The antenna structure according to claim 2, wherein: Each second resonator arm is perpendicular to the other two adjacent second resonator arms. Two of the second resonator arms of the first radiating portion are arranged in a diagonal direction of the dielectric substrate. An end of the first resonator arm away from the second resonator arm faces the same side in a counterclockwise direction or a clockwise direction.

4. The antenna structure according to claim 2, wherein: The number of the first isolation portions is four. Each of the first isolation portions is disposed on a side of the first resonator arm away from the second resonator arm, and is spaced apart and parallel to the first resonator arm.

5. The antenna structure according to claim 4, wherein: The length of the first resonator arm is smaller than that of the second resonator arm, the width of the first resonator arm is larger than that of the second resonator arm, and the length of the first isolation portion is equal to that of the first resonator arm.

6. The antenna structure according to claim 2, wherein: The second radiator has the same structure as the first radiator.

7. The antenna structure according to claim 1, wherein: The number of the plurality of radiation units is four, and the four radiation units are respectively arranged at the four corners of the dielectric substrate, and two radiation units located in the same diagonal direction on the dielectric substrate are symmetrical to each other about the center point of the dielectric substrate.

8. The antenna structure according to claim 1, wherein: The antenna structure further includes a metal reflector plate, which is spaced apart from the second surface.

9. A wireless communication device, characterized in that: The wireless communication device comprises the antenna structure according to any one of claims 1 to 8.

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