TWI663779B - Antenna structure and wireless communication device using same - Google Patents

Abstract

An antenna structure includes a radiating part, a grounding part, a feeding part, a metal frame, and a first matching circuit. The metal frame has a first breakpoint, and the first breakpoint forms a first radiation segment of a side frame of the metal frame. , The radiating part is connected to the feeding part and the ground part and is spaced from the inner side of the metal frame, and is electrically connected to the first radiating section, and one end of the first matching circuit is electrically connected to the The first radiating section is close to one end of the first breakpoint, the other end of the first matching circuit is electrically connected to the ground portion and connected to the ground, and the feeding portion feeds current to the radiating portion, the first Two ends of a radiation segment and the first matching circuit are used to excite radiation signals in a first frequency band. A wireless communication device having the antenna structure is also provided.

Description

Antenna structure and wireless communication device having the same

The invention relates to an antenna structure and a wireless communication device having the antenna structure.

With the advancement of wireless communication technology, wireless communication devices continue to develop toward the trend of thinness and lightness, and consumers' requirements for the appearance of products are becoming higher and higher. Because metal casings have advantages in appearance, mechanical strength, and heat dissipation effects, more and more manufacturers have designed wireless communication devices with metal casings, such as backplanes, to meet consumer demand. However, the metal casing easily interferes with the signal radiated by the antenna that is shielded in it, and it is not easy to achieve a broadband design, resulting in poor radiation performance of the built-in antenna. Furthermore, slots and breakpoints are usually provided on the backplane, which will affect the integrity and aesthetics of the backplane.

In view of this, it is necessary to provide an antenna structure and a wireless communication device having the antenna structure.

An antenna structure includes a radiating part, a grounding part, a feeding part, a metal frame, and a first matching circuit. The metal frame has a first breakpoint, and the first breakpoint forms a first radiation segment of a side frame of the metal frame. , The radiating part is connected to the feeding part and the ground part and is spaced from the inner side of the metal frame, and is electrically connected to the first radiating section, and one end of the first matching circuit is electrically connected to the The first radiating section is close to one end of the first breakpoint, the other end of the first matching circuit is electrically connected to the ground portion and connected to the ground, and the feeding portion is feeding A current flows to the radiation part, both ends of the first radiation segment, and the first matching circuit to excite a radiation signal in a first frequency band.

A wireless communication device includes the antenna structure described above.

By connecting a load element in series between the first extension portion and the second extension portion, the antenna structure can improve the isolation between the radiating portion with a short distance and the first radiating section, and preferably lower the mutual Interference improves the radiation quality of the antenna structure. In addition, the antenna structure is provided by the casing, and the breakpoints on the casing are disposed on the metal frame and are not disposed on the back plate, that is, the back plate is not insulated. Slotting, disconnection or breakpoint of the backplane, so that the backplane can avoid affecting the integrity and aesthetics of the backplane due to the setting of the slotting, disconnection or breakpoint.

100‧‧‧ Antenna Structure

11‧‧‧shell

111‧‧‧Front frame

112‧‧‧Backboard

113‧‧‧metal frame

114‧‧‧accommodation space

115‧‧‧Top

116‧‧‧First side

117‧‧‧ second side

1112‧‧‧First breakpoint

1114‧‧‧ Second breakpoint

24‧‧‧ the first radiation segment

22‧‧‧Second Radiation Section

26‧‧‧ The third radiation segment

13,513,613‧‧‧‧Radiation Department

132‧‧‧ the first protrusion

134‧‧‧second protrusion

136‧‧‧Alignment hole

14‧‧‧Feeding Department

15‧‧‧ Ground

152‧‧‧first arm

154‧‧‧second arm

156‧‧‧Third Arm

157‧‧‧contact hole

16‧‧‧First extension

18‧‧‧second extension

182‧‧‧Connecting contacts

20‧‧‧The first matching circuit

220, 622‧‧‧ load element

32‧‧‧Second matching circuit

222‧‧‧Load unit

262‧‧‧Third Extension

36‧‧‧Third matching circuit

38‧‧‧Fourth matching circuit

34‧‧‧Switch circuit

200‧‧‧Wireless communication device

201‧‧‧display unit

202‧‧‧ rear camera

210‧‧‧Circuit Board

27‧‧‧First feed source

28‧‧‧Second feed source

29‧‧‧ Third feed source

FIG. 1 is a schematic diagram of an antenna structure applied to a wireless communication device according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view of the wireless communication device shown in FIG. 1.

FIG. 3 is an assembly diagram of the antenna structure shown in FIG. 2.

FIG. 4 is a schematic partial plan view of the antenna structure shown in FIG. 3.

FIG. 5 is a schematic plan view of the antenna structure shown in FIG. 2.

FIG. 6 is a return loss curve diagram of the antenna structure during operation of the first embodiment of the present invention.

FIG. 7 is an isolation curve diagram of the antenna structure in operation according to the first embodiment of the present invention.

FIG. 8 is an efficiency curve diagram of the antenna structure in operation according to the first embodiment of the present invention.

FIG. 9 is a partial plan view of an antenna structure according to a second embodiment of the present invention.

FIG. 10 is a partial plan view of an antenna structure according to a third embodiment of the present invention.

In the following, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the present invention. Divided into examples, not all examples. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

It should be noted that when one element is called "electrically connected" to another element, it may be directly on the other element or there may be a centered element. When an element is considered to be "electrically connected" to another element, it can be a contact connection, for example, a wire connection, or a non-contact connection, for example, a non-contact coupling.

Unless defined otherwise, 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 invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

Hereinafter, some embodiments of the present invention will be described in detail with reference to the drawings. In the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.

Referring to FIG. 1, a preferred embodiment of the present invention provides an antenna structure 100 that can be applied to wireless communication devices 200 such as mobile phones and personal digital assistants to transmit and receive radio waves to transmit and exchange wireless signals.

Please refer to FIG. 2 and FIG. 3 together. The antenna structure 100 includes a housing 11, a radiation portion 13, a feeding portion 14, a ground portion 15, a first extension portion 16, a second extension portion 18, and a first matching circuit 20 ( (See Figures 4 and 5), second matching circuit 32 (see Figure 5), third matching circuit 36 (see Figure 5), fourth matching circuit 38 (see Figures 4 and 5), switching circuit 34 (see Figure 5).

Please refer to FIG. 2 and FIG. 3, the casing 11 may be a casing of the wireless communication device 200. The casing 11 includes a front frame 111, a back plate 112 and a metal frame 113. The front frame 111, the back plate 112, and the metal frame 113 constitute a casing of the wireless communication device 200. The front frame 111 An opening (not shown in the figure) is provided on the display unit 201 for receiving the display unit 201 of the wireless communication device 200. It can be understood that the display unit 201 has a display plane that is exposed from the opening, and the display plane is disposed substantially parallel to the back plate 112.

The back plate 112 is opposite to the front frame 111. The metal frame 113 is sandwiched between the front frame 111 and the back plate 112. The back plate 112 is provided with an opening 204 for exposing components such as the rear lens 202. The back plate 112 is not provided with any insulation slot, disconnection or break point for dividing the back plate 112 (please (See Figure 1). In a preferred embodiment of the present invention, the back plate 112 is made of a non-metal material.

The metal frame 113 is sandwiched between the front frame 111 and the back plate 112, and is respectively arranged around the periphery of the front frame 111 and the back plate 112 to communicate with the display unit 201 and the The front frame 111 and the back plate 112 together form a receiving space 114. The accommodating space 114 is used for accommodating electronic components or circuit modules such as a circuit board 210 and a processing unit of the wireless communication device 200 therein. In this embodiment, the electronic component includes at least the rear lens 202, and the rear lens 202 is disposed on the circuit board 210 of the wireless communication device 200.

The metal frame 113 includes at least a top portion 115, a first side portion 116, and a second side portion 117. The top portion 115 connects the front frame 111 and the back plate 112. The first side portion 116 and the second side portion 117 are disposed opposite to each other, and the two are respectively disposed at two ends of the top portion 115, and preferably are vertically disposed at both ends of the top portion 115. The first side portion 116 and the second side portion 117 are also connected to the front frame 111 and the back plate 112.

A first breakpoint 1112 and a second breakpoint 1114 are provided at intervals on the top 115 of the metal frame 113. The first breakpoint 1112 and the second breakpoint 1114 are located on the top 115. The breakpoints 1112 and 1114 divide the metal frame 113 into three parts, and the three parts include at least a first radiating segment 24, a second radiating segment 22, and a third radiating segment 26. In this embodiment, the first break point 1112 and the second break point 1114 are respectively disposed at the opposite ends of the top edge of the front frame 111 near the corners, and the second radiating section 22 Located between the first breakpoint 1112 and the second breakpoint 1114; the first radiation segment 24 extends from the first breakpoint 1112 to the first side portion 116; the third radiation segment 26 is from the second breakpoint 1114 extends to the second side portion 117. In addition, the breakpoints 1112 and 1114 are filled with an insulating material (such as plastic, rubber, glass, wood, ceramic, etc., but not limited to this), and the second radiation section 22 and the first radiation section 24 are filled. The third radiation section 26 is separated from each other.

It can be understood that the upper half of the metal frame 113 is not provided with other insulation slots, breaks or breakpoints in addition to the breakpoints, so the upper half of the metal frame 113 has only two breakpoints 1112 1114, no other breakpoints.

Referring to FIG. 3, the radiation portion 13 is a substantially rectangular metal plate. The radiating portion 13 is spaced from the second radiating section 22. The radiation portion 13 includes a first protruding portion 132 and a second protruding portion 134. The first protruding portion 132 and the second protruding portion 134 are respectively formed to extend outward from two adjacent sides of the radiation portion 13. The radiation portion 13 has two alignment holes 136 respectively, which are used to correspond the radiation portion 13 to an alignment element structure (not shown) on the circuit board 210. In this embodiment, one pair of positioning holes 136 is opened on the first protruding portion 132, and the other positioning hole 136 is opened on the diagonal with the first protruding portion 132. The radiating portions 13 are spaced from one side of the rear lens 202, and the other side of the rear lens 202 is spaced from the second radiating section 22.

The ground portion 15 is integrally formed with the radiation portion 13. The ground portion 15 is connected to the second protruding portion 134. The ground portion 15 includes a first arm 152, a second arm 154, and a third arm 156 connected in sequence. The first arm 152 is substantially U-shaped. One end of the first arm 152 is connected to the second protruding portion 134 and is flush with the second protruding portion 134. The other end is bent in a U-shape and extends to an interval parallel to the first portion. Two protrusions 134. The opposite ends of the second arm 154 are respectively connected to the first arm 152 and the third arm 156, and the angles between the second arm 154 and the first arm 152 and the third arm 156 are obtuse angles, respectively. The third arm 156 is substantially parallel to the radiation portion 13. A contact is formed on the third arm 156 Hole 157. The radiation portion 13 is fixed to the circuit board 210 by a carrier (not shown) through the contact hole 157.

The feeding portion 14 is substantially a U-shaped metal elastic piece. The feeding portion 14 is resisted between the radiating portion 13 and the circuit board 210. One end of the feeding portion 14 is electrically connected to the first feeding source 27 (see FIG. 4) on the circuit board 210, and the other end passes the fourth matching The circuit 38 is electrically connected to the radiating portion 13, so that the feeding portion 14 feeds current to the radiating portion 13.

The first extension portion 16 and the second extension portion 18 are respectively formed by the first radiation section 24 extending toward the radiation portion 13. Specifically, the first extension portion 16 is formed by an end of the first radiating section 24 located at the top 115 facing the radiating portion 13, and the first extension portion 16 is disposed near the first break point 1112. The first extension portion 16 is substantially a U-shaped metal elastic sheet; the second extension portion 18 is formed by an end of the first radiating section 24 located on the first side portion 116 facing the second protruding portion 134 of the radiating portion 13. And extends to be electrically connected to the ground portion 15. One end of the first radiating section 24 is connected to the ground plane of the circuit board 210, so that the ground section 15 passes through the second extending section 18 and the first radiating section 24. The radiating portion 13 provides a ground. In this embodiment, the second extension portion 18 may be fixed and electrically connected to a contact hole 157 formed in the third arm 156 of the ground portion 15 through a connection contact piece 182 (see FIG. 4).

Referring to FIGS. 4 and 5, the first matching circuit 20 includes a load element 220. Both ends of the second load element 220 are electrically connected to the first extension portion 16 and the second extension portion 18, respectively. In this embodiment, the load element 220 may be a capacitor, an inductor, a resistor, or a combination of an inductor and a capacitor.

The feeding portion 14 feeds current from a first feeding source 27 on the circuit board 210, and the current is fed into the radiation portion 13 through the fourth matching circuit 38 and flows to the radiation portion 13 and the ground portion 15 to After the connection contacts 182 flow in two directions, one direction is along the first direction. The two extensions 18 and the second radiator 24 flow to the ground plane of the circuit board 210; the other direction is to flow along the first matching circuit 20 to the first extension 16 and to the second radiator 24 to Ground plane of the circuit board 210. Therefore, the feeding portion 14, the radiating portion 13, the grounding portion 15, the second extending portion 18, the first matching circuit 20, the first extending portion 16, and the first radiating section 24 collectively excite a first mode to generate a first mode. Radiation signal in the frequency band. In this embodiment, the first mode is a WiFi mode, and the first frequency band is a 2400-2480 MHz frequency band. The feeding portion 14, the radiating portion 13, and the grounding portion 15 together form a WiFi antenna for transmitting and receiving WiFi radiation signals.

Referring to FIG. 5, one end of the second matching circuit 32 is electrically connected to the second feed source 28 on the circuit board 210, and the other end is electrically connected to the second radiation section 22. One end of the switching circuit 34 is electrically connected to the second radiation section 22, and the other end is connected to the ground. An access point of the switching circuit 34 connected to the second radiating section 22 is located between the access point of the second matching circuit 32 and the first breakpoint 1112. An end of the second radiating section 22 near the second breakpoint 1114 is also connected to the ground through a load unit 222. In this embodiment, the load unit 222 may be a capacitor, an inductor, a resistor, or a combination of an inductor and a capacitor. The second radiating section 22 feeds current from the second feeding source 28 through the second matching circuit 32. After the current enters the second radiating section 22 from the second matching circuit 32, it flows to the first breakpoints 1112 respectively. And the second break point 1114, and flow through the switching circuit 34 and the load unit 222 at the same time. Therefore, the second matching circuit 32, the second radiating section 22, the switching circuit 34, and the load unit 222 together form a diversity antenna and collectively excite a second mode to generate a radiation signal in a second frequency band. In this embodiment, the second mode is an LTE-A low-medium-high mode, and the second frequency band is 700-960 MHz, 1710-2170 MHz, and 2300-2690 MHz. Wherein, the second extension portion 18, the first matching circuit 20, and the first extension portion 16 are arranged so that the feed current of the first radiating section 24 is not coupled to the second radiating section 22, so that the The first mode and the second mode have good isolation, preferably lower mutual interference, and improve the radiation quality of the antenna structure 100.

Please refer to FIG. 5, the structure of the third radiating section 26 is substantially the same as that of the first radiating section 24. An end of the third radiation segment 26 near the second breakpoint 1114 is connected to a third feed source 29 on the circuit board 210 through a third matching circuit 36. A third extension portion 262 is disposed at an end of the third radiating section 26 away from the second breakpoint 1114, and is connected to the ground through the third extension portion 262. In this embodiment, the third radiating segment 26 feeds a current from a third feeding source 29 through the third matching circuit 36, and the current flows along the third radiating segment 26 to the third extension portion 262. Go down. Therefore, the third matching circuit 36, the third radiation section 26, and the third extension 262 collectively excite a third mode to generate a radiation signal in a third frequency band. In this embodiment, the third mode is a GPS mode, and the third frequency band is a 1575 MHz frequency band. The third matching circuit 36, the third radiation section 26, and the third extension 262 together form a GPS antenna for receiving and transmitting GPS radiation signals.

In this embodiment, a shielding mask for shielding electromagnetic interference or a middle frame supporting the display unit 201 may be provided on a side of the display unit 201 facing the back plate 112. The mask or the middle frame is made of a metal material. The ground plane may also be the shield or the middle frame. The ground plane is the ground of the antenna structure 100. That is, each of the ground portions or ground points is directly or indirectly connected to the ground plane.

In order to obtain better antenna characteristics, the width of the breakpoints 1112 and 1114 can be set to 1.5-2.5 mm. In this embodiment, the width of the breakpoints 1112 and 1114 is set to 2 millimeters to further improve the antenna efficiency of the radiating section without affecting the overall appearance of the antenna structure 100.

FIG. 6 is a return loss curve diagram of the antenna structure 100 during operation. The curve S61 is a return loss value of the WiFi antenna during operation; the curve S62 is a return loss value of the diversity antenna during operation. The curve S63 is an isolation curve when the WiFi antenna and the diversity antenna work.

FIG. 7 is an isolation curve diagram of a WiFi antenna and a diversity antenna of the antenna structure 100. The curve S71 is an isolation curve when the WiFi antenna and the diversity antenna are working. The curve S72 is an isolation curve of the isolation of the WiFi antenna and the diversity antenna when the first matching circuit 20 is omitted. Obviously, when the WiFi antenna and the diversity antenna in the antenna structure 100 are matched with the first matching circuit 20, the isolation between the WiFi antenna and the diversity antenna is greatly improved.

FIG. 8 is an efficiency curve diagram of the antenna structure 100 during operation. Curve S81 is the efficiency curve of the WiFi antenna; curve S82 is the efficiency curve when the WiFi antenna and the diversity antenna omit the first matching circuit 20. Obviously, when the WiFi antenna and the diversity antenna in the antenna structure 100 are matched with the first matching circuit 20, the radiation efficiency of the antenna structure 100 is greater than -7 decibels (dB), which is less than omitting the first matching circuit 20 The radiation efficiency of the antenna structure is improved by about 2 dB.

Obviously, from FIG. 6 to FIG. 8, when the WiFi antenna and the diversity antenna in the antenna structure 100 are matched with the first matching circuit 20, the antenna structure 100 has higher isolation and better Radiation efficiency. In addition, the antenna structure 100 can also work in low, medium and high frequency, WiFi frequency bands and GPS frequency bands, covering a wide frequency range. When the antenna structure 100 works in the above frequency bands, its operating frequency can meet the antenna design requirements. And has better radiation efficiency.

In this embodiment, the WiFi antenna is a PIFA antenna formed by the feeding portion 14, the radiating portion 13, and the ground portion 15. In another embodiment, the WiFi antenna may not be limited to the above-mentioned PIFA antenna structure, and may also be another form of antenna structure. For example, in the second embodiment, referring to FIG. 9, the WiFi antenna may be a loop antenna. One end of the radiating portion 513 is electrically connected to the first feeding source 27, and the other end is electrically connected to the connection contact 182. In a third embodiment, referring to FIG. 10, the WiFi antenna may be a monopole antenna. spoke One end of the radiation part 613 is electrically connected to the first feed source 27, and the other end extends to be spaced from the second radiation segment 22. One end of the radiating part 613 connected to the first feeding source 27 is also electrically connected to the connection contact 182 through another load element 622.

The antenna structure 100 can improve the isolation between the radiating section 13 and the second radiating section 22 which are closer to each other by connecting a load element 220 in series between the first extension 16 and the second extension 18. The ground reduces mutual interference and improves the radiation quality of the antenna structure 100. In addition, the antenna structure 100 is provided by the casing 11, and the breakpoints on the casing 11 are all disposed on the metal frame 113 and are not disposed on the back plate 112, that is, the back There are no insulated slots, breaks, or breakpoints on the plate 112, so that the back plate 112 can avoid affecting the integrity and aesthetics of the back plate 112 due to the settings of the slots, breaks, or breakpoints.

The above descriptions are merely preferred embodiments of the present invention, and are not intended to limit the present invention in any form. In addition, those skilled in the art can also make other changes within the spirit of the present invention. Of course, these changes made in accordance with the spirit of the present invention should be included in the scope of the present invention.

Claims (12)

An antenna structure is improved in that the antenna structure includes a radiating portion, a ground portion, a feeding portion, a metal frame, and a first matching circuit, the metal frame has a first break point, and the first break point is a portion of the metal frame. The side frame forms a first radiating segment, the radiating portion is connected to the feeding portion and the ground portion and is disposed at an interval from the inside of the metal frame, and is electrically connected to the first radiating segment, the first matching One end of the circuit is electrically connected to an end of the first radiating section close to the first breakpoint, the other end of the first matching circuit is electrically connected to the ground portion to ground, and the feeding portion feeds current to The radiating portion, two ends of the first radiating segment, and the first matching circuit to excite a radiation signal in a first frequency band, the radiating portion includes a first protruding portion and a second protruding portion, and the first protruding portion And a second protruding portion are respectively formed to extend outward from two adjacent sides of the radiating portion, and two ends of the first radiating section respectively extend to form a first extending portion and a second extending portion, and the first Extending portion by said first One end of the radiation segment is formed to extend to the radiating portion, and the first extension portion is disposed adjacent to the first breakpoint; the second extension portion is directed from the end of the first radiation segment away from the first breakpoint. The second protruding portion of the radiating portion is formed to extend to be electrically connected to the ground portion. The antenna structure according to item 1 of the patent application scope, wherein the antenna structure further includes a fourth matching circuit, and the fourth matching circuit is connected to the feeding portion and the radiating portion. The antenna structure according to item 1 of the patent application scope, wherein the antenna structure further includes a first feed source, a second feed source, and a second breakpoint, and the feed section is electrically connected to the first feed The source is used to feed current. The metal frame between the second breakpoint and the first breakpoint forms a second radiating segment. The radiating portion is spaced from the second radiating segment. The second radiating segment is electrically Is electrically connected to the second feed source and feeds current from the second feed source, and the current flows along the second radiation segment to excite a radiation signal in the second frequency band, and the frequency of the first frequency band is higher than the second frequency band The first matching circuit is used to improve the isolation between the radiation signal in the first frequency band and the radiation signal in the second frequency band. The antenna structure according to item 1 of the scope of patent application, wherein the feeding portion, the radiating portion, and the ground portion form a PIFA antenna, a loop antenna, or a monopole antenna. The antenna structure according to item 3 of the scope of patent application, wherein the second radiating section forms a third radiating section with respect to the metal frame portion on the other side of the second breakpoint. The antenna structure according to item 1 of the scope of patent application, wherein the first matching circuit includes a load element, and both ends of the load element are electrically connected to the first extension portion and the second extension portion, respectively. The load element is a capacitor, an inductor, a resistor, or a combination of an inductor and a capacitor. The antenna structure according to item 6 of the scope of patent application, wherein the feeding portion, the radiating portion, the ground portion, the second extending portion, the first matching circuit, the first extending portion and the first radiating section collectively excite a first mode State to generate a radiation signal in a first frequency band, the first mode is a WiFi mode. The antenna structure according to item 3 of the scope of patent application, wherein the antenna structure further includes a second matching circuit, a switching circuit, and a load unit, and one end of the second matching circuit is electrically connected to the second feed source, The other end is electrically connected to the second radiation segment, one end of the switching circuit is electrically connected to the second radiation segment, and the other end is connected to ground. The access point of the switching circuit connected to the second radiation segment is located at Between the access point of the second matching circuit and the first breakpoint, an end of the second radiating section near the second breakpoint is also connected to the ground through a load unit, and the load unit may be Capacitance, inductance, resistance, or a combination of inductance and capacitance. The antenna structure according to item 8 of the scope of patent application, wherein the second radiating section feeds current from a second feed source through the second matching circuit, and after the current enters the second radiating section from the second matching circuit, Flow to the first breakpoint and the second breakpoint respectively, and flow through the switching circuit and the load unit at the same time, so that the second matching circuit, the second radiating section, the switching circuit and the load unit together form a diversity antenna, A second mode is collectively excited to generate a radiation signal in a second frequency band, and the second mode is an LTE-A low-medium-high mode. The antenna structure according to item 5 of the scope of patent application, wherein the antenna structure further includes a third feed source, the structure of the third radiating section is the same as the structure of the first radiating section, and the third radiating section is close to One end of the second breakpoint is connected to the third feed source through a third matching circuit, and a third extension is provided at an end of the third radiating section far from the second breakpoint, and passes through the third The extension is connected to the ground, and the position of the third extension is symmetrical to the position of the second extension. The antenna structure according to claim 10, wherein the third radiating section feeds a current from a third feed source through the third matching circuit, and the current flows along the third radiating section to the third radiating section. The three extensions descend to the ground, so that the third matching circuit, the third radiating section, and the third extension collectively excite a third mode to generate a radiation signal in a third frequency band, and the third mode is a GPS mode. A wireless communication device includes the antenna structure according to any one of claims 1-11.