Antenna structure and wireless communication device having the same

Abstract

The application provides an antenna structure and a wireless communication device with the same. The antenna structure is applied to a wireless communication device, and the wireless communication device comprises a metal frame and a metal element. The antenna structure is arranged in a gap between the metal element and the metal frame, and the antenna structure comprises: a first grounding part, a second grounding part and a third grounding part, which are arranged in sequence and are spaced apart, and the first grounding part, the second grounding part and the third grounding part are all connected to the metal frame; a radiation part, one end of the radiation part is connected to the second grounding part and the third grounding part, and the other end of the radiation part is connected to the first grounding part; and a feed source, which is electrically connected to the radiation part and the first grounding part, and is used for feeding current to the antenna structure. The antenna structure provided by the application has better anti-interference characteristics and meets the design requirements of antenna work.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of antennas, and in particular, to an antenna structure and a wireless communication device having the same. BACKGROUND

[0002] With the popularity of wireless communication devices, consumers have higher requirements for the appearance of wireless communication devices. The design trend of wireless communication device products is increasingly towards metalization and thinness. However, the metal appearance is easy to form a shielding effect on the antenna, reducing the transmission characteristics of the antenna. Therefore, how to design an antenna with good transmission characteristics under a full-metal appearance has become a challenge for those skilled in the art. SUMMARY

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

[0004] In one aspect, the present application provides an antenna structure applied to a wireless communication device, the wireless communication device comprising a metal frame and a metal element, the antenna structure being arranged in a gap between the metal element and the metal frame, the antenna structure comprising:

[0005] a first ground part, a second ground part and a third ground part, the first ground part, the second ground part and the third ground part being arranged in sequence and spaced apart, the first ground part, the second ground part and the third ground part being connected to the metal frame;

[0006] a radiation part, one end of the radiation part being connected to the second ground part and the third ground part, and the other end of the radiation part being connected to the first ground part;

[0007] a feed source, the feed source being electrically connected to the radiation part and the first ground part, for feeding current to the antenna structure.

[0008] In another aspect, the present application also provides a wireless communication device, the wireless communication device comprising a frame, the wireless communication device comprising the antenna structure as described above.

[0009] The antenna structure provided by this invention comprises a first grounding part, a second grounding part, a third grounding part, and a radiating part. The first, second, and third grounding parts are all located on one side of the frame of the wireless communication device and connected to the frame. The radiating part is located on the side of the second and third grounding parts away from the frame and is connected to the second and third grounding parts. Thus, when the antenna structure is installed within a wireless communication device with an all-metal back cover, the frame does not need to be divided, thus meeting the design requirements for antenna operation, providing excellent anti-interference characteristics, and ensuring the aesthetics of the wireless communication device. Attached Figure Description

[0010] Figure 1 This is a perspective view of a wireless communication device provided in an embodiment of the present invention.

[0011] Figure 2 In one embodiment of this application, Figure 1 A partial disassembly diagram of the wireless communication device shown.

[0012] Figure 3 In another embodiment of this application, Figure 1 A partial disassembly diagram of the wireless communication device shown.

[0013] Figure 4 for Figure 3 A schematic diagram of the antenna structure in the wireless communication device shown.

[0014] Figure 5 for Figure 4 The diagram shows the dimensions of the antenna structure.

[0015] Figure 6 A matching circuit diagram provided for an embodiment of the present invention.

[0016] Figure 7 for Figure 4 The diagram shows the current flow when the antenna structure is in operation.

[0017] Figure 8 for Figure 4 The return loss curve of the antenna structure shown is illustrated.

[0018] Figure 9 for Figure 4 The radiation efficiency curve of the antenna structure shown is illustrated.

[0019] Figure 10 This is a schematic diagram of an antenna structure provided for another embodiment of the present invention.

[0020] Figure 11 for Figure 10 The diagram shows the dimensions of the antenna structure.

[0021] Figure 12 The matching circuit diagram provided for another embodiment of the present application.

[0022] Figure 13 For Figure 10 The current flow schematic diagram of the antenna structure shown in operation.

[0023] Figure 14 For Figure 10 The return loss curve diagram of the antenna structure shown.

[0024] Figure 15 For Figure 10 The radiation efficiency curve diagram of the antenna structure shown.

[0025] Figure 16 For Figure 10 The return loss curve diagram of the antenna structure in different states.

[0026] Figure 17 For Figure 10 The radiation efficiency curve diagram of the antenna structure in different states.

[0027] Figure 18 For Figure 10 The return loss curve diagram of the antenna structure in free state and in the SAR value test environment of 0mm back.

[0028] Figure 19 For Figure 10 The radiation efficiency curve diagram of the antenna structure in free state and in the SAR value test environment of 0mm back.

[0029] Main component symbol explanation

[0030] Wireless communication device 200

[0031] Frame 201

[0032] Metal back cover 202

[0033] Middle frame 203, 203'

[0034] Display screen 204

[0035] Housing space 205

[0036] Gap 206

[0037] Gap 207

[0038] Metal element 208

[0039] Metal layer 209

[0040] Antenna structure 100, 300

[0041] First ground portion 10

[0042] First bent section 11

[0043] Second bent section 12

[0044] Third bent section 13

[0045] Second ground portion 20

[0046] Fourth bent section 21

[0047] Fifth bent section 22

[0048] Third ground portion 30

[0049] Sixth bent section 31

[0050] Seventh bent section 32

[0051] Radiating portion 40, 40a

[0052] Body 41

[0053] Extension section 42

[0054] Feed source 50

[0055] Extension portion 60, 60a

[0056] Matching circuit 70, 70a

[0057] First capacitor C1

[0058] Second capacitor C2

[0059] Third capacitor C3

[0060] Fourth capacitor C4

[0061] First inductor L1

[0062] Second inductor L2

[0063] Third inductor L3

[0064] Fourth inductor L4

[0065] The following detailed description will further explain the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0066] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of the present application.

[0067] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this description, the singular forms "a", "an" and "the" include plural references unless the context clearly dictates otherwise.

[0068] Some embodiments of the present application will be described in detail with reference to the drawings. The following embodiments and features of the embodiments can be combined with each other in the case of no conflict.

[0069] Please refer to Figure 1 With Figure 2 An embodiment of the present application provides an antenna structure 100, which can be used in a wireless communication device 200 to transmit and receive radio waves to communicate and exchange wireless signals. The wireless communication device 200 can be a wireless communication device such as a tablet computer, a mobile phone, a personal digital assistant, a smart watch, a television or a smart car.

[0070] In the embodiment, the wireless communication device 200 at least includes a metal frame 201 and a metal back cover 202.

[0071] The metal frame 201 is made of metal material, and the metal frame 201 can be the outer frame of the wireless communication device 200. The metal frame 201 is arranged at the edge of the metal back cover 202. In this way, the metal frame 201 and the metal back cover 202 form the shell of the wireless communication device 200, and the metal frame 201 and the metal back cover 202 jointly form a receiving space 205 with an opening.

[0072] The wireless communication device 200 further includes a metal element 208. Please refer to Figure 2 In some embodiments, the metal element 208 can be a middle frame 203. That is, the middle frame 203 is made of metal material. The middle frame 203 is received in the receiving space 205, and the middle frame 203 and the metal back cover 202 are arranged in parallel and spaced apart. The middle frame 203 is used to carry electronic elements (not shown in the figure).

[0073] Please refer to Figure 3In some embodiments, the metal element 208 can be any one of a metal wire, a metal shielding plate, a printed circuit board, a flexible circuit board, a barrier wall, a control chip, a camera module, or the like. It can be understood that the metal element 208 is arranged on the middle frame 203'. The middle frame 203' is arranged in the receiving space 205 and is substantially parallel and spaced apart from the metal back cover 202. It can be understood that in the present embodiment, the middle frame 203' can be made of a metal material or a plastic material, etc.

[0074] The wireless communication device 200 further comprises a display screen 204. In the present embodiment, the display screen 204 can be a touch display screen and can be used to provide an interactive interface to realize the interaction between the user and the wireless communication device 200. The display screen 204 is arranged in the receiving space 205 and is substantially parallel and spaced apart from the metal back cover 202.

[0075] The antenna structure 100 can be directly made of a metal sheet or by laser direct structuring (LDS).

[0076] Please refer to Figure 3 and Figure 4 In the present embodiment, the antenna structure 100 is arranged in the gap 206 between the metal element 208 and the metal frame 201, i.e. in the receiving space 205.

[0077] In the present embodiment, the antenna structure 100 comprises a first ground part 10, a second ground part 20, a third ground part 30, and a radiation part 40.

[0078] The first ground part 10, the second ground part 20, and the third ground part 30 are sequentially and spaced apart, and are all arranged on one side of the metal frame 201. The first ground part 10, the second ground part 20, and the third ground part 30 are all connected to the metal frame 201.

[0079] In the embodiment, the first grounding part 10 comprises a first bending section 11, a second bending section 12 and a third bending section 13. The first bending section 11 is substantially in the shape of a rectangular sheet. One side of the first bending section 11 is attached to the inner surface of the metal frame 201, so that the plane where the first bending section 11 is located is substantially perpendicular to the plane where the metal back cover 202 is located, and the first bending section 11 is connected to the metal frame 201. The second bending section 12 is substantially in the shape of a rectangular sheet. The plane where the second bending section 12 is located is perpendicular to the plane where the first bending section 11 is located. The second bending section 12 is connected to the end of the first bending section 11 away from the metal back cover 202, and extends to the side where the second grounding part 20 is located, and forms an acute angle with the metal frame 201. The third bending section 13 is substantially in the shape of a rectangular sheet. The third bending section 13 is connected to the end of the second bending section 12 away from the first bending section 11, and extends in the direction parallel to the metal frame 201 and close to the second grounding part 20.

[0080] The second grounding part 20 comprises a fourth bending section 21 and a fifth bending section 22. The fourth bending section 21 is substantially in the shape of a rectangular sheet. One side of the fourth bending section 21 is attached to the inner surface of the metal frame 201, so that the plane where the fourth bending section 21 is located is substantially perpendicular to the plane where the metal back cover 202 is located, and the fourth bending section 21 is connected to the metal frame 201. The fifth bending section 22 is substantially in the shape of a rectangular sheet. The plane where the fifth bending section 22 is located is perpendicular to the plane where the fourth bending section 21 is located. The fifth bending section 22 is connected to the end of the fourth bending section 21 away from the metal back cover 202, and extends perpendicularly in the direction away from the metal frame 201.

[0081] The third grounding part 30 comprises a sixth bending section 31 and a seventh bending section 32. The sixth bending section 31 is substantially in the shape of a rectangular sheet. One side of the sixth bending section 31 is attached to the inner surface of the metal frame 201, so that the plane where the sixth bending section 31 is located is substantially perpendicular to the plane where the metal back cover 202 is located, and the sixth bending section 31 is connected to the metal frame 201. The seventh bending section 32 is substantially in the shape of a rectangular sheet. The plane where the seventh bending section 32 is located is perpendicular to the plane where the sixth bending section 31 is located. The seventh bending section 32 is connected to the end of the sixth bending section 31 away from the metal back cover 202, and extends perpendicularly in the direction away from the metal frame 201.

[0082] The radiating portion 40 is disposed on the side of the second grounding portion 20 and the third grounding portion 30 away from the metal frame 201. One end of the radiating portion 40 is connected to the second grounding portion 20 and the third grounding portion 30, and the other end of the radiating portion 40 is connected to the first grounding portion 10. Specifically, the radiating portion 40 can be connected to the fifth bending segment 22 of the second grounding portion 20 and the seventh bending segment 32 of the third grounding portion 30.

[0083] In this embodiment, the second bending segment 12, the third bending segment 13, the fifth bending segment 22, and the seventh bending segment 32 are coplanar with the radiating portion 40, and the planes containing the first bending segment 11, the fourth bending segment 21, and the sixth bending segment 31 are perpendicular to the plane containing the radiating portion 40. Thus, the plane containing the radiating portion 40 is parallel to the plane containing the metal back cover 202.

[0084] It is understood that the antenna structure 100 also includes a feed source 50. The feed source 50 is electrically connected to the radiating section 40 to feed current to the radiating section 40 of the antenna structure 100. The first grounding section 10 is also electrically connected to the feed source 50 to provide grounding for the feed source 50. It is understood that the radiating section 40 and the first grounding section 10 are connected through the feed source 50.

[0085] In this embodiment, the antenna structure 100 further includes an extension 60. In this embodiment, the extension 60 is generally inverted L-shaped. One end of the extension 60 is connected to the radiating part 40, and the other end extends a distance away from the radiating part 40, then bends vertically towards the first grounding part 10 and extends a distance thereafter, and is spaced apart from the first grounding part 10.

[0086] The side of the extension 60 away from the first grounding part 10 is flush with the side of the radiation part 40 away from the second grounding part 20 and the third grounding part 30.

[0087] In this embodiment, the extension 60 and the radiating portion 40 are coplanar. Therefore, the plane containing the radiating portion 40 and the extension 60 is parallel to the plane containing the metal back cover 202. Furthermore, since the metal back cover 202 has a radiation shielding effect, the radiating portion 40 and the extension 60 radiate most of the energy in the direction of the display screen 204, thus meeting the design requirements for antenna operation.

[0088] Therefore, in the present embodiment, the antenna structure 100 does not need to be provided with a break or a slot on the metal frame 201, i.e., the metal frame 201 can be a complete and continuous metal frame, so that the antenna structure 100 can work normally.

[0089] Of course, in other embodiments, the metal frame 201 can also be provided with a slot or a break, so as to serve as a frame antenna of the wireless communication device 200, thereby assisting or together with the antenna structure 100 to realize energy radiation.

[0090] It can be understood that, in an optional embodiment, the second ground part 20, the third ground part 30, the radiation part 40 and the extension part 60 are integrally formed.

[0091] It can be understood that the stability of the antenna structure 100 can be enhanced by providing a support (not shown in the figure) under the radiation part 40, the extension part 60, the first ground part 10, the second ground part 20 and the third ground part 30.

[0092] Please refer to Figure 3 and Figure 4 In an embodiment, the metal element 208 is arranged at a middle portion of the metal frame 201. The metal element 208 has at least one metal layer 209. Therefore, the metal layer 209 is formed in the wireless communication device 200 and is arranged apart from the metal frame 201, so as to form the gap 206.

[0093] It can be understood that the antenna structure 100 is arranged in the gap 206. The radiation part 40 is arranged close to the metal layer 209 and further forms the gap 207 with the metal layer 209. Therefore, when current is fed from the feed-in source 50, the current will flow through the radiation part 40 and be coupled to the metal layer 209 through the gap 207, so that the antenna structure 100 generates an additional frequency band (details are described below). In the present embodiment, the metal layer 209 and the metal frame 201 are parallel to each other.

[0094] Please continue to refer to Figure 5Fig. 2 is a schematic diagram of the dimension structure of the antenna structure 100. In this embodiment, the width g1 of the gap 207 is 0.5 mm. The width g2 of the gap 206 is 6.7 mm. The length l1 of the radiating portion 40 is 30.7 mm. The width W1 of the radiating portion 40 is 5.2 mm. The distance g3 between the radiating portion 40 and the metal frame 201 is 1.5 mm. The length l2 of the extending portion 60 is 10 mm. The width W2 of the extending portion 60 near the end of the radiating portion 40 is 2.4 mm. The width W3 of the extending portion 60 away from the end of the radiating portion 40 is 3.6 mm. With the feeding source 50 vertically mapping to the metal frame 201 as a center point O, along the direction of the metal frame 201 extending, the distance lg1 from the center point O to the first grounding portion 10 is 5.7 mm. The distance lg2 from the center point O to the second grounding portion 20 is 6.7 mm. The distance lg3 from the center point O to the third grounding portion 30 is 24.2 mm.

[0095] Please continue to refer to Figure 6 In an optional embodiment, the feeding source 50 is also connected to the antenna structure 100 through a matching circuit 70. The matching circuit 70 includes a first capacitor C1, a second capacitor C2, a first inductor L1 and a second inductor L2. One end of the first capacitor C1 is connected to the antenna structure 100, for example, to the radiating portion 40 of the antenna structure 100. The other end of the first capacitor C1 is connected to one end of the second capacitor C2. The other end of the second capacitor C2 is grounded. One end of the first inductor L1 is connected between the first capacitor C1 and the second capacitor C2. The other end of the first inductor L1 is grounded. One end of the second inductor L2 is connected between the first capacitor C1 and the first inductor L1. The other end of the second inductor L2 is connected to the feeding source 50. In this way, the feeding source 50 feeds the antenna structure 100 with electrical signals through the matching circuit 70.

[0096] In this embodiment, the capacitance values of the first capacitor C1 and the second capacitor C2 are both 0.3 picofarad (pf). The inductance value of the first inductor L1 is 3 nanohenry (nh). The inductance value of the second inductor L2 is 2 nanohenry (nh).

[0097] Please refer to Figure 7 Fig. 3 is a schematic diagram of the current flow of the antenna structure 100 when it is in operation. When the current is fed from the feeding source 50, the current will flow through the radiating portion 40 and be grounded through the third grounding portion 30 (see path P1), thereby exciting the first operating mode and the second operating mode to generate the first frequency band and the second frequency band of the radiating signal. The frequency of the first frequency band is lower than the frequency of the second frequency band. The frequency of the second frequency band is the multiple of the frequency of the first frequency band.

[0098] When current is fed from the feed source 50, the current will flow through the radiation part 40, and be grounded through the second grounding part 20 (see path P2), thereby exciting a third operating mode to generate a third frequency band of radiation signals.

[0099] When current is fed from the feed source 50, the current will flow through the radiation part 40, and then flow through the extension part 60 (see path P3), thereby exciting a fourth operating mode to generate a fourth frequency band of radiation signals.

[0100] When current is fed from the feed source 50, the current will flow through the radiation part 40, and be coupled to the metal layer 209 through the gap 207 (see path P4), thereby exciting a fifth operating mode to generate a fifth frequency band of radiation signals.

[0101] In the embodiment, the first operating mode is a WIFI 2.4G mode, and the first frequency band includes 2400-2480 MHz. The second operating mode is a WIFI 6E operating mode, and the second frequency band includes 6500-7105 MHz. The third operating mode is also a WIFI 6E operating mode, and the third frequency band includes 5946-6500 MHz. The fourth operating mode is a WIFI 5G operating mode, and the fourth frequency band includes 5170-5330 MHz. The fifth operating mode is a Sub-6G operating mode, and the fifth frequency band includes 3300-3600 MHz.

[0102] Please continue to refer to Figure 8 and Figure 9 . Figure 8 is the return loss curve of the antenna structure 100 in operation. It can be seen from Figure 8 that the antenna structure 100 can operate in the corresponding first frequency band (2400-2480 MHz), second frequency band (6500-7105 MHz), third frequency band (5946-6500 MHz), fourth frequency band (5170-5330 MHz), and fifth frequency band (3300-3600 MHz). That is, WIFI 2.4G, WIFI 5G, WIFI 6E, and Sub-6G are covered, the frequency range is wide, and when the antenna structure 100 operates in the above frequency bands, the antenna operating design requirements can be met.

[0103] Figure 9A radiation efficiency curve of the antenna structure 100 in operation is shown in FIG. 6. The radiation efficiency of the first frequency band is about -3.9 dB, the radiation efficiency of the second frequency band and the third frequency band is about -1.5 dB, the radiation efficiency of the fourth frequency band is about -2.2 dB, and the radiation efficiency of the fifth frequency band is about -4.2 dB. That is, the antenna structure 100 has a better radiation efficiency in operation.

[0104] It can be understood that in other embodiments, the antenna structure 100 can also be applied to 3G / 4G / 5G antennas, GPS antennas, and Bluetooth antennas.

[0105] Please continue to refer to Figure 10 The second embodiment of the present application provides an antenna structure 300 which can be applied to the wireless communication device 200. The antenna structure 300 comprises a first grounding portion 10, a second grounding portion 20, a third grounding portion 30, a radiation portion 40a, an extension portion 60a, and a feed source 50.

[0106] The antenna structure 300 has substantially the same structure as the antenna structure 100, and the difference lies in the structure of the radiation portion 40a and the extension portion 60a, which is different from that of the radiation portion 40 and the extension portion 60 in the antenna structure 100.

[0107] In this embodiment, the radiation portion 40a comprises a body 41 and an extension segment 42. The body 41 is substantially a square sheet. The body 41 is connected to the fifth bending segment 22 and the seventh bending segment 32. One end of the extension segment 42 is connected to one end of the body 41 close to the second grounding portion 20, and the other end of the extension segment 42 extends away from the body 41. The width of the extension segment 42 is smaller than that of the body 41, and the side of the extension segment 42 close to the second grounding portion 20 is flush with the side of the body 41 close to the second grounding portion 20. In this way, the extension segment 42 and the body 41 jointly form a gap 43.

[0108] In this embodiment, the extension portion 60a also has a substantially inverted L shape. One end of the extension portion 60a is connected to the second bending segment 12 of the first grounding portion 10, and the other end extends away from the metal frame 201 for a distance, then bends at right angles towards the radiation portion 40a and extends for a distance to extend into the gap 43, and is spaced apart from the body 41 and the extension segment 42 of the radiation portion 40a.

[0109] In this embodiment, the extension portion 60a, the extension segment 42, the body 41, the second bending segment 12, the third bending segment 13, the fifth bending segment 22, and the seventh bending segment 32 are coplanarly arranged.

[0110] It can be understood that in the embodiment, the antenna structure 300 is different from the antenna structure 100 in the first embodiment in that the size of the antenna structure 300 is different from the size of the antenna structure 100. Specifically, please continue to refer to Figure 11 In the embodiment, the width g1' of the gap 207 between the radiation part 40a and the metal layer 209 is also 0.5 mm, the distance g2' between the metal layer 209 and the metal frame 201 is 6.7 mm. The distance g3' between the radiation part 40a and the metal frame 201 is 1.5 mm. With the feed source 50 vertically mapping to the metal frame 201 as a center point O', along the direction of extending of the metal frame 201, the distance lg1' from the center point O' to the first ground part 11 is 5.7 mm, the distance lg2' from the center point O' to the second ground part 20 is 9.7 mm, and the distance lg3' from the center point O' to the third ground part 30 is 32.7 mm. The length l1' of the body 41 is 29 mm, and the width W1' of the body 41 is 5.2 mm. The length l2' of the extension section 42 is 8.7 mm, and the width W2' of the extension section 42 is 2.7 mm. The length l3' of the extension part 60a is 16 mm, the width W3' of the end of the extension part 60a away from the radiation part 40a is 6.6 mm, and the width W4' of the end of the extension part 60a close to the radiation part 40a is 1.5 mm.

[0111] It can be understood that in the embodiment, the feed source 50 is also connected to the antenna structure 300 through the matching circuit 70a. The antenna structure 300 is different from the antenna structure 100 in that the circuit structure of the matching circuit 70a is different from the circuit structure of the matching circuit 70. Specifically, please continue to refer to Figure 12 The matching circuit 70a includes a third capacitor C3, a fourth capacitor C4, a third inductor L3, and a fourth inductor L4. One end of the third capacitor C3 is connected to the antenna structure 300, for example, to the radiation part 40a and the first ground part 10 of the antenna structure 300. The other end of the third capacitor C3 is connected to one end of the third inductor L3, and the other end of the third inductor L3 is connected to the feed source 50. One end of the fourth capacitor C4 is connected between the third capacitor C3 and the third inductor L3, and the other end of the fourth capacitor C4 is grounded. One end of the fourth inductor L4 is connected between the third capacitor C3 and the antenna structure 300, and the other end of the fourth inductor L4 is grounded.

[0112] In an embodiment, the third capacitor C3 has a capacitance of 0.5 picofarad (pf), and the fourth capacitor C4 has a capacitance of 0.3 picofarad (pf). The third inductor L3 and the fourth inductor L4 each has an inductance of 1.5 nanohenry (nh).

[0113] It can be understood that, in the present embodiment, the current path P1’ in the antenna structure 300 has the same current flow direction and working principle as the current path P1 in the antenna structure 100, which will not be described here again. In addition, the antenna structure 300 is different from the antenna structure 100 in the first embodiment in that the current paths P2’, P3’ and P4’ in the antenna structure 300 have different current flow directions from the current paths P2, P3 and P4 in the antenna structure 100.

[0114] Please continue to refer to Figure 13 , Figure 13 is a schematic diagram of the current flow of the antenna structure 300 in operation. When current is fed from the feed source 50, the current flows through the radiation portion 40a and is grounded through the second ground portion 20 (see path P2’), thereby exciting a sixth operating mode to generate a sixth frequency band of radiation signals.

[0115] When current is fed from the feed source 50, the current will flow through the radiation portion 40a and be coupled to the extension portion 60a through the extension segment 42 (see path P3’), thereby exciting a seventh operating mode to generate a seventh frequency band of radiation signals.

[0116] When current is fed from the feed source 50, the current will flow through the radiation portion 40a and be coupled to the metal layer 209 through the gap 207 (see path P4’), thereby exciting an eighth operating mode to generate an eighth frequency band of radiation signals.

[0117] In the present embodiment, the sixth operating mode and the seventh operating mode are also WIFI6E operating modes, the sixth frequency band includes 5490-5570 MHz, and the seventh frequency band includes 5925-7125 MHz. The eighth operating mode is a Sub-6G operating mode, and the eighth frequency band includes 4400-5000 MHz.

[0118] Please continue to refer to Figure 14 and Figure 15 . Figure 14 is a return loss (Return Loss) curve of the antenna structure 300 in operation. As can be seen from Figure 14It can be seen that the antenna structure 300 can work in the corresponding first frequency band (2400-2480 MHz), the sixth frequency band (5490-5570 MHz), the seventh frequency band (5925-7125 MHz) and the eighth frequency band (4400-5000 MHz). That is, WIFI 2.4G, WIFI 5G, WIFI 6E and Sub-6G are covered, the frequency range is wide, and when the antenna structure 300 works in the above frequency bands, the antenna working design requirements can be met.

[0119] Figure 15 is a radiation efficiency curve diagram of the antenna structure 300 when working. Among them, the radiation efficiency of the second frequency band is about -4.2 dB. The radiation efficiency of the third frequency band is about -2.9 dB. The radiation efficiency of the fourth frequency band is about -2.4 dB. The radiation efficiency of the sixth frequency band is about -5.1 dB. That is, when the antenna structure 300 works, it has better radiation efficiency.

[0120] Please refer to Figure 1 , Figure 16 and Figure 17 , Figure 16 is a return loss (Return Loss) curve diagram of the antenna structure 300 in different states when the antenna structure 300 is arranged in the wireless communication device 200 shown in Figure 1 . Among them, curve S1 is the return loss curve of the wireless communication device 200 in the free state; curve S2 is the return loss curve in the state that the wireless communication device 200 is held vertically by one hand, and the metal frame 201 is touched by the hand; curve S3 is the return loss curve in the state that the wireless communication device 200 is held horizontally by two hands, and the frames 201 on both sides of the wireless communication device 200 are touched by the hands.

[0121] Figure 17 is a radiation efficiency curve diagram of the antenna structure 300 in different states when the antenna structure 300 is arranged in the wireless communication device 200 shown in Figure 1 . Among them, curve S4 is the radiation efficiency curve of the wireless communication device 200 in the free state; curve S5 is the radiation efficiency curve in the state that the wireless communication device 200 is held vertically by one hand, and the metal frame 201 is touched by the hand; curve S6 is the radiation efficiency curve in the state that the wireless communication device 200 is held horizontally by two hands, and the frames 201 on both sides of the wireless communication device 200 are touched by the hands.

[0122] Obviously, from Figure 16 and Figure 17It can be seen that, when the wireless communication device 200 is held by a single hand in a vertical manner or held by two hands in a horizontal manner, the return loss of the antenna structure 300 has little change compared to the return loss of the antenna structure 300 in a free state, and the drop of the radiation efficiency of the antenna structure 300 is less than 1 dB compared to the radiation efficiency of the antenna structure 300 in a free state. Thus, the antenna structure 300 has better anti-hand interference characteristics when arranged in the wireless communication device 200.

[0123] Please continue to refer to Figures 18 to 19 . Figure 18 When the antenna structure 300 is arranged in the wireless communication device 200 shown in Figure 1 , the return loss curves of the wireless communication device 200 in a free state and in a 0mm back SAR value test environment, respectively. Among them, curve S7 represents the return loss curve of the wireless communication device 200 in a free state, and curve S8 represents the return loss curve of the wireless communication device 200 in a 0mm back SAR value test environment.

[0124] Figure 19 When the antenna structure 300 is arranged in the wireless communication device 200 shown in Figure 1 , the radiation efficiency curves of the wireless communication device 200 in a free state and in a 0mm back SAR value test environment, respectively. Among them, curve S9 represents the radiation efficiency curve of the wireless communication device 200 in a free state, and curve S10 represents the radiation efficiency curve of the wireless communication device 200 in a 0mm back SAR value test environment.

[0125] Obviously, from Figure 18 and Figure 19 It can be seen that the return loss curve of the wireless communication device 200 in a 0mm back SAR value test environment has little change compared to the return loss curve of the wireless communication device 200 in a free state; the drop of the radiation efficiency curve of the wireless communication device 200 in a 0mm back SAR value test environment is small compared to the radiation efficiency curve of the wireless communication device 200 in a free state. It can be understood that, since the 0mm back SAR value test environment simulates the environment when the human body contacts the metal back cover 202 of the wireless communication device 200, from Figure 18 and Figure 19 It can be seen that, when the antenna structure 300 is arranged in the wireless communication device 200, the wireless communication device 200 has better anti-body interference characteristics.

[0126] Please continue to refer to the following SAR value test table. As can be seen from the SAR test table, the wireless communication device 200 provided with the antenna structure 300 has a SAR value less than the regulatory value 1.6 under each working frequency band of WIFI 2.4G (for example, 2.4 GHz, 2.44 GHz and 2.48 GHz), WIFI 5G (for example, 5.2 GHz, 5.5 GHz, 5.8 GHz and 5.9 GHz) and WIFI 6E (for example, 6.5 GHz and 7.1 GHz) and a signal strength of 18 dBm or 15 dBm, which meets the design requirements of the wireless communication device.

[0127] SAR value test table

[0128]

[0129] Obviously, the antenna structure 100 of the present application sets the first ground part 10, the second ground part 20, the third ground part 30 and the radiation part 40, and the first ground part 10, the second ground part 20 and the third ground part 30 are arranged on one side of the frame 201 of the wireless communication device 200 and connected with the metal frame 201, the radiation part 40 is arranged on the side of the second ground part 20 and the third ground part 30 away from the metal frame 201, the radiation part 40 is connected with the second ground part 20 and the third ground part 30, and the radiation part 40 is parallel to the metal back cover 202. In this way, when the antenna structure 100 (or the antenna structure 300) is arranged in the wireless communication device 200 with a full-metal back cover 202, the metal frame 201 does not need to be divided, and the design requirements of the antenna operation can be met, and the wireless communication device 200 has good anti-interference characteristics, thereby ensuring the aesthetics of the wireless communication device 200.

[0130] The above embodiments are only used to illustrate the technical solutions of the present application and not to limit it. Although the present application has been described in detail with reference to the above preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the present application. Those skilled in the art can also make other changes in the design of the present application within the spirit 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 be included in the scope of protection claimed by the present application.

Claims

1. An antenna structure applied in a wireless communication device, the wireless communication device comprising a metal frame and metal components, characterized in that: The antenna structure is arranged in a gap between the metal element and the metal frame, the metal element has at least one metal layer, the antenna structure is arranged between the metal layer and the metal frame, and the antenna structure comprises: a first ground part, a second ground part and a third ground part, the first ground part, the second ground part and the third ground part are arranged in sequence and are spaced apart, and the first ground part, the second ground part and the third ground part are connected to the metal frame; a radiation part, one end of the radiation part is connected to the second ground part and the third ground part, and the other end of the radiation part is connected to the first ground part, wherein the radiation part is arranged close to the metal layer and forms a gap between the radiation part and the metal layer, the metal layer and the radiation part are coupled to each other through the gap to excite a radiation frequency band; a feed source, the feed source is electrically connected to the radiation part and the first ground part, and is used to feed current to the antenna structure.

2. The antenna structure of claim 1, wherein: The metal element is any one of a middle frame, a metal wire, a metal shielding plate, a printed circuit board, a flexible circuit board, a control chip, a camera module or a retaining wall.

3. The antenna structure of claim 1, wherein: The antenna structure further comprises an extension part, and the extension part is connected to one of the radiation part and the first ground part.

4. The antenna structure of claim 3, wherein: One end of the extension part is connected to the radiation part, and the other end of the extension part extends in a direction away from the radiation part for a distance, and then extends in a direction close to the first ground part by being bent, and is arranged in a spaced-apart manner with the first ground part.

5. The antenna structure of claim 3, wherein: One end of the extension part is connected to the first ground part, and the other end of the extension part extends in a direction away from the metal frame for a distance, and then extends in a direction close to the radiation part by being bent, and is arranged in a spaced-apart manner with the radiation part.

6. An antenna structure as claimed in any one of claims 3 to 5, characterized in that: The extension part and the radiation part are coplanarly arranged.

7. The antenna structure of claim 1, wherein: The metal frame is a complete and continuous frame.

8. A wireless communication device, comprising a metal frame and the antenna structure according to any one of claims 1 to 7.

9. The wireless communication apparatus of claim 8, wherein: The wireless communication device further comprises a metal back cover, and the radiation part is arranged in parallel with the metal back cover.

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