TW201806244A - Antenna structure and wireless communication device using same - Google Patents

Abstract

The present invention provides an antenna structure includes a metallic member, a first radiator, and an isolating portion. The metallic member includes a front frame, a backboard, and a side frame. The side frame defines a slot. The front frame defines a first gap and a second gap. The gaps are in air communication with the slot and extend across the front frame. A portion of the front frame between the first gap and the second gap forms a radiating section, the first radiating portion and the second radiating portion are connected to opposite ends of the radiating section and adjacent to the first gap and the second gap, respectively. Current enters the radiating section from the first feed portion, the current flows through the radiating section and towards the first gap and the first radiating portion, thus activating radiating signals in a first frequency band; the current flows through the radiating section and towards the first ground potion, thus activating radiating signals in a second frequency band; the current flows through the radiating section and towards the second gap and the second radiating portion, thus activating radiation signals in a third different frequency band. A wireless communication device using the antenna structure is 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 metal 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, the metal back plate is usually provided with slots and break points, which will affect the integrity and aesthetics of the metal back plate.

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 metal piece, a first feeding portion, and a first ground portion. The metal piece includes a metal front frame, a metal back plate, and a metal frame. The metal frame is sandwiched between the metal front frame and the metal. A slot is provided on the metal frame between the back plates, and a first break point and a second break point are provided on the metal front frame. The first break point and the second break point are respectively provided in the slot. At the two ends, the first breakpoint and the second breakpoint communicate with the slot and extend to cut off the metal front frame, and the metal front frame located between the first breakpoint and the second breakpoint forms radiation Segment, the first feed-in part and the first ground part are connected to the radiation segment at intervals, and the antenna structure further includes a first radiator and a second radiator, and the first radiator and the second radiator are connected respectively To the two sides of the radiating section and to be respectively arranged close to the first breakpoint and the second breakpoint, the first ground portion is provided between the first breakpoint and the first feed-in portion, and the current flows from the A first feed-in portion feeds to the radiating section and flows to the first break along the radiating section. And a first radiator to excite a radiation signal in a first frequency band, a current is fed from the first feeding portion to the radiation segment and flows along the radiation segment to the first ground portion to excite a radiation signal in a second frequency band, the current Feeding from the first feeding section to the radiating section and flowing along the radiating section to the second breakpoint and the second radiator to excite the radiation signal of the third frequency band, the frequency of the second frequency band is higher than the first frequency The frequency of the frequency band, the frequency of the third frequency band is higher than the frequency of the second frequency band.

A wireless communication device includes the antenna structure described above.

The antenna structure is provided with the metal piece, and the slots and breakpoints on the metal piece are provided on the metal front frame and the metal frame, but not on the metal back plate, so that The metal backplane forms an all-metal structure, that is, the metal backplane has no insulating slots, breaks or breakpoints, so that the metal backplate can avoid affecting the metal due to the slotting, breakage or breakpoint settings The integrity and aesthetics of the backplane.

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 embodiments of the present invention, but not all of the embodiments. 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 present invention is for the purpose of describing specific embodiments only and is 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.

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.

Example 1

Referring to FIG. 1, a first 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 metal member 11, a first feeding portion 13, a grounding portion 14, a radiator 15, a second feeding portion 16, and a first matching circuit 17 (see FIG. 5). A switching circuit 18 (see FIG. 6) and a second matching circuit 19 (see FIG. 7).

The metal part 11 may be a casing of the wireless communication device 200. The metal component 11 includes a metal front frame 111, a metal back plate 112, and a metal frame 113. The metal front frame 111, the metal back plate 112, and the metal frame 113 may be integrally formed. The metal front frame 111, the metal back plate 112, and the metal frame 113 constitute a casing of the wireless communication device 200. The metal front frame 111 is provided with an opening (not shown) 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, the display plane is exposed from the opening, and the display plane is substantially parallel to the metal back plate 112.

The metal back plate 112 is opposite to the metal front frame 111. The metal back plate 112 is directly connected to the metal frame 113. There is no gap between the metal back plate 112 and the metal frame 113. The metal back plate 112 is an integrally formed single metal sheet. The metal back plate 112 is provided with openings 204 and 205 for exposing elements such as the rear dual lens 202 and the receiver 203. The metal back plate 112 is not provided. Any slot, break or breakpoint for dividing the insulation of the metal back plate 112 (see FIG. 2). The metal back plate 112 can be used as a ground of the antenna structure 100.

The metal frame 113 is sandwiched between the metal front frame 111 and the metal back plate 112, and is disposed around the periphery of the metal front frame 111 and the metal back plate 112 to communicate with the display unit. 201. The metal front frame 111 and the metal back plate 112 together form an accommodating 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 dual lens 202, the receiver 203, and the front lens 207. The rear dual lens 202, the receiver 203, and the front lens 207 are arranged side by side and spaced apart. 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 115 is connected to the metal front frame 111 and the metal 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 metal front frame 111 and the metal back plate 112. A slot 118 is also defined in the metal frame 113. In this embodiment, the slot 118 is disposed on the top portion 115 and extends to the first side portion 116 and the second side portion 117 respectively. It can be understood that, in other embodiments, the slot 118 may be provided only on the top portion 115 without extending to any one of the first side portion 116 and the second side portion 117, or the opening portion The groove 118 is provided on the top portion 115 and extends along only one of the first side portion 116 and the second side portion 117.

A first break point 1112 and a second break point 1114 are spaced from the top edge of the metal front frame 111. The first break point 1112 and the second break point 1114 are located between two ends of the slot 118. A third breakpoint 1116 is defined in the metal front frame 111 corresponding to the first side edge 116 and near the top edge. The third breakpoint 1116 is located at one end of the slot 118. Specifically, the third breakpoint 1116 is located at an end of the slot 118 on the first side portion 116. The breakpoints 1112, 1114, and 1116 communicate with the slot 118 and extend to block the metal front frame 111. The three breakpoints are divided into three parts from the front metal frame 111, and the three parts include at least a first radiation segment 22, a second radiation segment 24, and a third radiation segment 26. In this embodiment, the first breakpoint 1112 and the second breakpoint 1114 are respectively disposed at the opposite ends of the top edge of the metal front frame 111 near the corners, and the first radiating section 22 is located at the first breakpoint 1112 and the first Between the two breakpoints 1114; the second radiating segment 24 is located between the second breakpoint 1114 and the third breakpoint 1116; the second radiating segment 24 extends from the top edge to the side edge of the metal front frame 111, and extends past An arc-shaped corner of the metal front frame 111; the third radiating section 26 is located between the first break point 1112 and the end of the slot 118 on the second side 117, and the third radiating section 26 The top edge of the metal front frame 111 extends to the other side, and passes through another arc-shaped corner of the metal front frame 111. In addition, the slot 118 and the breakpoints 1112, 1114, and 1116 are filled with an insulating material (such as plastic, rubber, glass, wood, ceramic, etc., but not limited to this), so as to distinguish the first A radiating section 22, a second radiating section 24, a third radiating section 26 and the rest of the metal part 11.

It can be understood that the upper half of the metal front frame 111 is not provided with other insulation slots, breaks, or breakpoints in addition to the breakpoint, so the upper half of the metal front frame 111 has only three breakpoints. 1112, 1114, 1116, no other breakpoints.

One end of the first feeding portion 13 can be electrically connected to the feeding source 27 through a first matching circuit 17 (see FIG. 5), and the other end is electrically connected to the first radiating section 22, so that the first feeding portion 13 is The first radiation section 22 is fed with a current. In this embodiment, after a current is fed from the first feeding section 13, the current is transmitted to the first breakpoint 1112 and the second breakpoint 1114 in the first radiation section 22, so that the first radiation section 22 starts at this point. The first feeding portion 13 is divided into a metal short arm A1 facing the first break point 1112 and a metal long arm A2 facing the second break point 1114. In this embodiment, the position where the first feeding portion 13 is accessed does not correspond to the middle of the first radiating section 22, so the length of the metal long arm A2 is greater than the length of the metal short arm A1. One end of the ground portion 14 is connected to the metal short arm A1, and the other end is connected to a ground plane through the switching circuit 18. The first feed-in portion 13 and the ground portion 14 are both substantially L-shaped metal arms, and the two are disposed at substantially parallel intervals.

Referring to FIG. 5, the first matching circuit 17 is disposed on the circuit board 210. The first matching circuit 17 includes a first inductor L1, a first capacitor C1, a second inductor L2, and a second capacitor C2. One end of the first inductor L1 is electrically connected to the first feeding portion 13, and the other end is electrically connected to the feeding source 27 through the first capacitor C1. One end of the second inductor L2 is electrically connected between the first feeding portion 13 and the first inductor L1, and the other end is connected to a ground plane. One end of the second capacitor C2 is electrically connected between the first inductor L1 and the second inductor L2, and the other end is connected to a ground plane. In this embodiment, the inductance value of the first inductor L1 is 1.5 nanohenries, the capacitance value of the first capacitor C1 is 1.2 picofarads, and the inductance value of the second inductor L2 is 10 nanohenries. The capacitance of the two capacitors C2 is 0.8 picofarad.

Please refer to FIG. 6, the switching circuit 18 is disposed on the circuit board 210. One end of the switching circuit 18 is electrically connected to the ground portion 14, and the other end is connected to a ground plane. The switching circuit 18 includes a switching unit 182 and at least one switching element 184. The switching element 184 may be an inductor, a capacitor, or a combination of an inductor and a capacitor. The switching elements 184 are connected in parallel with each other, and one end of the switching elements 184 is electrically connected to the switching unit 182, and the other end is electrically connected to the ground plane. The other end of the switching unit 182 is electrically connected to the ground portion 14. In this way, by controlling the switching of the switching unit 182, the metal short arm A1 can be switched to a different switching element 184.

The first feeding section 13 feeds current from a feeding source 27 through the first matching circuit 17. After the current is fed into the first radiating section 22, the current flows in two directions, and one direction is along the metal. The short arm A1 flows to the first breakpoint 1112 to excite a first mode to generate a radiation signal in a first frequency band. After the current is fed into the first radiation section 22, the other direction of the current is flowing along the metal long arm A2 to the second breakpoint 1114 to excite a second mode to generate a radiation signal in the second frequency band. In this embodiment, the first mode is an LTE-A intermediate frequency mode, the first frequency band is a 1710-2170 MHz frequency band, and the second mode is an LTE-A low frequency mode, and the second frequency band For the 700-960 MHz band.

Since each switching element 184 in the switching circuit 18 has a different impedance, the frequency band of the second mode of the first radiating section 22 and the frequency band of the third radiating section 26 can be adjusted by the switching of the switching unit 182. The frequency band of the fourth mode. The adjustment of the frequency band is to shift the frequency band to a low frequency or to a high frequency. In this embodiment, when the switching unit 182 switches to a switching element 184 with an inductance value of 25 nanohenries, the antenna structure 100 can work in a low frequency band 704-746MHz and a high frequency band 1710-2690MHz. When the switching unit 182 switches to a switching element 184 with an inductance value of 18 nanohenries, the antenna structure 100 can work in the low-frequency band 746-787 MHz. When the switching unit 182 switches to a switching element 184 with an inductance value of 7.5 nanohenries, the antenna structure 100 can work in a low frequency band of 850 MHz. When the switching unit 182 switches to a switching element 184 with an inductance value of 3.6 nanohenries, the antenna structure 100 can work in a low frequency band of 900 MHz.

The radiator 15 is a substantially L-shaped metal arm, one end of which is substantially vertically connected to an end of the second radiating section 24 near the second breakpoint 1114, and the other end of which is substantially vertically connected to the second feeding portion 16 One end. The other end of the second feeding portion 16 is electrically connected to the feeding source 29 through the second matching circuit 19.

Referring to FIG. 7, the second matching circuit 19 is disposed on the circuit board 210. The second matching circuit 19 includes a third inductor L3. One end of the third inductor L3 is electrically connected to the second feeding portion 16, and the other end is electrically connected to a ground plane. The feed source 29 is electrically connected between the second feed portion 16 and the third inductor L3. In this embodiment, the inductance value of the third inductance L3 is 1.8 nanohenries. The radiator 15 feeds a current from a feed source 29 through the second feeding portion 16 and the second matching circuit 19, and the current flows along the radiator 15 and the second radiating section 24 and flows to the third break point. 1116 to 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 radiation segment 26 is coupled to obtain a current from the metal short arm A1, and a current flows along the third radiation segment 26 to excite a fourth mode to generate a radiation signal in a fourth frequency band. In this embodiment, the fourth mode is an LTE-A high-frequency mode, and the fourth frequency band is a 2300-2690 MHz frequency band.

The first feeding portion 13 is disposed between the receiver 203 and the front lens 207. The ground portion 14 is disposed between the metal short arm A1 and the front lens 207. The radiator 15 and the second feeding portion 16 are disposed between the rear dual lens 202 and the second radiation section 24.

The ground plane may be the metal back plate 112. Alternatively, 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 metal 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. Alternatively, the metal back plate 112 may be connected to the shield or the middle frame to form a larger ground plane. 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 this embodiment, in order to obtain better antenna characteristics, the width of the slot 118 may be set to 3-4.5 mm. In this embodiment, the width of the slot 118 may be set to 3.83 mm, that is, the first radiating section 22, the second radiating section 24, and the third radiating section 26 are set to 3.83 mm from the metal back plate 112. The first radiating section 22, the second radiating section 24, and the third radiating section 26 are kept away from the metal back plate 112, so as to improve the antenna efficiency of the radiating section. The widths of the breakpoints 1112, 1114, and 1116 can be set to 1.5-2.5 mm. In this embodiment, the widths of the breakpoints 1112, 1114, and 1116 are set to 2 mm, so as to further improve the antenna efficiency of the radiating section without affecting the overall appearance of the antenna structure 100.

FIG. 4 is a schematic diagram of a current trend during operation of the antenna structure 100. After the current enters the first radiating section 22 from the first feed-in portion 13, it flows in the directions on both sides, one of which flows through the metal short arm A1 and flows to the first break point 1112 ( (Refer to path P1), the current path P1 excites the LTE-A intermediate frequency mode; the other direction of the current is flowing through the metal long arm A2 and flowing to the second breakpoint 1114, and the direction of the current is different from that of the The direction of P1 is opposite (see path P2), and the circuit path P2 excites the LTE-A low-frequency mode. After the current enters the radiator 15 from the second feed-in portion 16, it flows through the radiator 15 and the second radiating section 24 in sequence, and flows to the third break point 1116 (see path P3), and then is excited. Out of the GPS modality. When a current is coupled from the metal short arm A1 to the third radiating section 26 and flows through the third radiating section 26 (see path P4), the LET-A high-frequency mode is further excited.

FIG. 8 is a return loss curve diagram of the first radiating section 22 and the third radiating section 26 of the antenna structure 100 during operation. Among them, curve S81 is the return loss value when the first radiating section 22 operates in the low-frequency band 704-746MHz; curve S82 is the return loss value when the first radiating section 22 operates in the low-frequency band 746-787MHz; curve S83 is the first A return loss value when a radiating section 22 operates at a low frequency band of 850 MHz; curve S84 is a return loss value when the first radiating section 22 operates at a low frequency band of 900 MHz. The switching circuit 18 adjusts the frequency band to present different frequency curves. form. The curve S85 is the return loss value when the first radiation section 22 and the third radiation section 26 work in the LTE-A intermediate frequency band (1710-2170MHz). The curve S86 is the return loss value when the first radiating section 22 and the third radiating section 26 work in the LTE-A high-frequency band (1850-2690MHz).

FIG. 9 is a return loss curve diagram of the second radiation section 24 of the antenna structure 100 during operation. The curve S91 is a return loss value when the second radiation segment 24 operates in the GPS frequency band (1575 MHz).

FIG. 10 is an efficiency curve diagram of the first radiating section 22 and the third radiating section 26 of the antenna structure 100 during operation. Among them, curve S101 is the efficiency curve when the first radiation segment 22 operates in the low-frequency band 704-746MHz; curve S102 is the efficiency curve when the first radiation segment 22 operates in the low-frequency band 746-787MHz; curve S103 is the first radiation segment 22 The efficiency curve when working in a low frequency band of 850 MHz; curve S104 is the efficiency curve when the first radiating section 22 works in a low frequency band of 900 MHz. The switching circuit 18 adjusts the frequency band to present different frequency curve shapes. The curve S105 is the efficiency curve when the first radiating section 22 and the third radiating section 26 work in the LTE-A intermediate frequency band and the LTE-A high frequency band (1850-2690MHz).

FIG. 11 is an efficiency curve diagram of the second radiating section 24 of the antenna structure 100 during operation. The curve S111 is the radiation efficiency when the second radiation segment 24 operates in the GPS frequency band (1575MHz).

Obviously, from FIG. 8 to FIG. 11, the antenna structure 100 can work in the corresponding LTE-A low-frequency band (700-960 MHz), LTE-A intermediate-frequency band (1710-2170MHz), and LTE-A high-frequency band. (2300-2690MHz). In addition, the antenna structure 100 can also work in the GPS frequency band (1575MHz), that is, it covers low, medium, and high frequencies, and the frequency range is wide. When the antenna structure 100 works in the above frequency band, its operating frequency can be all Meet the antenna design requirements and have better radiation efficiency.

The antenna structure 100 is provided with the metal member 11, and the slots and breakpoints on the metal member 11 are provided on the metal front frame 111 and the metal frame 113, but not on the metal back plate. 112, so that the metal back plate 112 forms an all-metal structure, that is, the metal back plate 112 does not have insulation slots, breaks or break points, so that the metal back plate 112 can avoid The setting of lines or breakpoints affects the integrity and aesthetics of the metal back plate 112.

Example 2

Referring to FIG. 12, a second preferred embodiment of the present invention provides an antenna structure 500 that can be applied to a wireless communication device 600 such as a mobile phone or a personal digital assistant to transmit and receive radio waves to transmit and exchange wireless signals.

12 and FIG. 13 together, the antenna structure 500 includes a metal member 51, a first feeding portion 53, a first ground portion 54, a first radiator 55, a second radiator 56, a third radiator 57, The second feeding part 58, the second ground part 59, the matching circuit 62 (see FIG. 16), the first switching circuit 64 (see FIG. 17), and the second switching circuit 66 (see FIG. 18).

The metal piece 51 may be a casing of the wireless communication device 600. The metal piece 51 includes a metal front frame 511, a metal back plate 512, and a metal frame 513. The metal front frame 511, the metal back plate 512, and the metal frame 513 may be integrally formed. The metal front frame 511, the metal back plate 512, and the metal frame 513 constitute a casing of the wireless communication device 600. The metal front frame 511 is provided with an opening (not shown) for receiving the display unit 601 of the wireless communication device 600. It can be understood that the display unit 601 has a display plane, the display plane is exposed from the opening, and the display plane is substantially parallel to the metal back plate 512.

Please refer to FIG. 14 together, the metal back plate 512 is opposite to the metal front frame 511. The metal back plate 512 is directly connected to the metal frame 513. There is no gap between the metal back plate 512 and the metal frame 513. The metal back plate 512 is an integrally formed single metal sheet. The metal back plate 512 is provided with openings 604 and 605 for exposing components such as a rear dual lens and a receiver. The metal back plate 512 is not provided with any purpose. Slots, breaks or breaks for dividing the metal back plate 512. The metal back plate 512 can be used as a ground of the antenna structure 500.

The metal frame 513 is sandwiched between the metal front frame 511 and the metal back plate 512, and is disposed around the periphery of the metal front frame 511 and the metal back plate 512 to communicate with the display unit. 601. The metal front frame 511 and the metal back plate 512 together form an accommodating space 514. The accommodating space 514 is used for accommodating electronic components or circuit modules such as a circuit board 610 and a processing unit of the wireless communication device 600 therein. In this embodiment, the electronic component includes at least the headphone socket 602, a USB connector 603, and a speaker 607. The earphone socket 602, the USB connector 603, and the speaker 607 are arranged side by side and spaced from the circuit board 610 of the wireless communication device 600.

The metal frame 513 includes at least a bottom portion 515, a first side portion 516, and a second side portion 517. The bottom portion 515 connects the metal front frame 511 and the metal back plate 512. The first side portion 516 and the second side portion 517 are disposed opposite to each other, and the two are respectively disposed at two ends of the bottom portion 515, and are preferably vertically disposed at both ends of the bottom portion 515. The first side portion 516 and the second side portion 517 are also connected to the metal front frame 511 and the metal back plate 512. A slot 518 is also defined in the metal frame 513. In this embodiment, the slot 518 is disposed on the bottom portion 515 and extends to the first side portion 516 and the second side portion 517, respectively. It can be understood that, in other embodiments, the slot 518 may be provided only on the bottom portion 515 and does not extend to any one of the first side portion 516 and the second side portion 517, or the opening The groove 518 is disposed on the bottom portion 515 and extends along only one of the first side portion 516 and the second side portion 517.

A first break point 5112 and a second break point 5114 are respectively symmetrically formed on both sides of the metal front frame 511 near the bottom edge. The first breakpoint 5112 and the second breakpoint 5114 are respectively located at two opposite ends of the slot 518. The breakpoints 5112, 5114 communicate with the slot 518, and extend to block the metal front frame 511. A portion of the metal front frame 511 between the first break point 5112 and the second break point 5114 forms a radiation segment 52. In this embodiment, the radiating section 52 extends linearly from the bottom edge of the metal front frame 511. In addition, the slot 518 and the breakpoints 5112, 5114 are filled with an insulating material (such as plastic, rubber, glass, wood, ceramic, etc., but not limited to this), so as to separate the radiating section 52. With the rest of the metal piece 51.

It can be understood that the lower half of the metal front frame 511 is not provided with other insulation slots, breaks, or breakpoints except the breakpoints 5112 and 5114, so the lower half of the metal front frame 511 has only two There are breakpoints 5112, 5114, and no other breakpoints.

One end of the first feeding section 53 is connected to the radiating section 52, and the other end is connected to the feeding source 68 through the matching circuit 62, so that the first feeding section 53 feeds current to the radiating section 52. In this embodiment, after a current is fed from the first feeding portion 53, the current is transmitted to the first break point 5112 and the second break point 5114 in the radiating section 52, so that the radiating section 52 uses the first feeding section 53 is a separation point divided into a metal long arm B1 facing the first break point 5112 and a metal short arm B2 facing the second break point 5114. In this embodiment, the position where the first feeding portion 53 is connected does not correspond to the middle of the radiating section 52, so the length of the metal long arm B1 is greater than the length of the metal short arm B2.

Referring to FIG. 16, the matching circuit 62 is disposed on the circuit board 610. The matching circuit 62 includes a first capacitor C1, a first inductor L1, and a second inductor L2. One end of the first inductor L1 is electrically connected to the first feeding portion 53, and the other end is electrically connected to the feeding source 68. One end of the first capacitor C1 is electrically connected between the first inductor L1 and the feeding source 68, and the other end is connected to a ground plane. One end of the second inductor L2 is electrically connected between the first inductor L1 and the first feeding portion 53, and the other end is connected to a ground plane. In this embodiment, the capacitance value of the first capacitor C1 is 1 picofarad, the inductance value of the first inductor L1 is 0.5 nanohenry, and the inductance value of the second inductor L2 is 8.2 nanohenry.

Referring to FIG. 17, the first ground portion 54 is disposed at a distance from the first feeding portion 53. One end of the first ground portion 54 is connected to the metal long arm B1, and the other end is connected to a ground plane through the first switching circuit 64. The first switching circuit 64 includes a first switching unit 642 and at least one first switching element 644. The first switching element 644 may be an inductor, a capacitor, or a combination of an inductor and a capacitor. The first switching elements 644 are connected in parallel with each other, and one end of the first switching elements 644 is electrically connected to the first switching unit 642, and the other end is electrically connected to a ground plane. The other end of the first switching unit 642 is electrically connected to the first ground portion 54. In this way, by controlling the switching of the first switching unit 642, the radiating section 52 can be switched to a different first switching element 644 through the first grounding portion 54. Each of the first switching elements 644 has a different impedance.

The first radiator 55 is connected to an end of the metal long arm B1 near the first break point 5112. In this embodiment, the first radiator 55 is a substantially linear metal arm, which is connected to the side of the metal front frame 511 provided with the first break point 5112 and is substantially parallel to the metal front frame. The bottom edge of 511.

One end of the second radiator 56 is connected to one end of the metal short arm B2 near the second break point 5114, and the other end is connected to the ground plane through the second switching circuit 66. In this embodiment, the second radiator 56 is a substantially L-shaped metal arm connected to a side of the metal front frame 511 provided with a second break point 5114. A section of the second radiator 56 is substantially parallel to the bottom edge of the metal front frame 511. The first radiator 55, the first ground portion 54, the first feeding portion 53 and the second radiator 56 are arranged at intervals between the first breakpoint 5112 and the second breakpoint 5114 in this order.

Referring to FIG. 18, the structures of the second switching circuit 66 and the first switching circuit 64 are substantially the same. The first switching circuit 64 and the second switching circuit 66 are both disposed on the circuit board 610. The second switching circuit 66 includes a second switching unit 662 and at least one second switching element 664. The second switching element 664 may be an inductor, a capacitor, or a combination of an inductor and a capacitor. The second switching elements 664 are connected in parallel with each other, and one end of the second switching elements 664 is electrically connected to the second switching unit 662, and the other end is electrically connected to a ground plane. The other end of the second switching unit 662 is electrically connected to the second radiator 56. In this way, by controlling the switching of the second switching unit 662, the metal short arm B2 can be switched to a different second switching element 664 through the second radiator 56. Each second switching element 664 has a different impedance.

The first feeding portion 53 feeds current from a feeding source 68 through the matching circuit 62. After the current is fed into the radiating section 52, the current flows in both directions, one of which flows through the metal long arm B1. Flows to the first breakpoint 5112 and flows to the first radiator 55, thereby exciting a first mode to generate a radiation signal in a first frequency band. In this embodiment, the first mode is an LTE-A low-frequency mode, and the first frequency band is a 700-960 MHz frequency band. In addition, after the current is fed into the radiation section 52, it flows along the metal long arm B1 and flows to the first ground portion 54 and the first switching circuit 64, thereby exciting a second mode to generate a radiation signal in the second frequency band. In this embodiment, the second mode is an LTE-A intermediate frequency mode, and the second frequency band is a 1710-2170 MHz frequency band. Another direction of current flowing after the current is fed into the radiating section 52 is through the metal short arm B2, to the second break point 5114, and to the second radiator 56 and the second switching circuit 66, so that A third mode is excited to generate a radiation signal in a third frequency band. In this embodiment, the third mode is an LTE-A high-frequency mode, and the third frequency band is a 2300-2690 MHz frequency band.

By controlling the switching of the first switching unit 642, the metal long arm B1 can be switched to a different first switching element 644; by controlling the switching of the second switching unit 662, the metal short arm B2 can be made Switching to a different second switching element 664. Since each of the first switching element 644 and the second switching element 664 has a different impedance, the first mode of the metal long arm B1 can be adjusted through the switching of the first switching unit 642 and the second switching element 662, respectively. The first frequency band of the first mode and the third frequency band of the third mode of the metal short arm B2, and the second mode has a stable and wide bandwidth. The adjustment of the frequency band is to shift the frequency band to a low frequency or to a high frequency.

In this embodiment, when the first switching unit 642 is switched to an open circuit, and the second switching unit 662 is switched to a second switching element 664 having an inductance value of 2 nanohenry, the antenna structure 500 operates at a low frequency band of 700 MHz. And high-frequency band 1710-1880MHz. When the first switching unit 642 switches to the first switching element 644 with an inductance value of 39 nanohenry, and the second switching unit 662 switches to the second switching element 664 with an inductance value of 2 nanohenry, the antenna structure 500 works at a low frequency. The frequency band is 850MHz. When the first switching unit 642 switches to a first switching element 644 with an inductance value of 18 nanohenry, and the second switching unit 662 switches to a second switching element 664 with an inductance value of 2 nanohenry, the antenna structure 500 works at a low frequency. The frequency band is 900MHz. When the first switching unit 642 switches to the first switching element 644 with an inductance value of 4.3 NaH, and the second switching unit 662 switches to the second switching element 664 with a capacitance value of 33 picofarads, the antenna structure 500 works at a high level. The frequency band is 1850-1990MHz. When the first switching unit 642 switches to a first switching element 644 with an inductance value of 4.3 NaH, and the second switching unit 662 switches to a second switching element 664 with a capacitance value of 2.8 picofarads, the antenna structure 500 works at a high level. The frequency band is 1920-2170MHz. When the first switching unit 642 switches to the first switching element 644 with an inductance value of 4.3 NaH, and the second switching unit 662 switches to the second switching element 664 with a capacitance value of 0.6 picofarads, the antenna structure 500 works at a high level. The frequency band is 2300-2400MHz. When the first switching unit 642 switches to the first switching element 644 with an inductance value of 4.3 NaH, and the second switching unit 662 switches to the second switching element 664 with a capacitance value of 0.3 picofarad, the antenna structure 500 works at high The frequency band is 2500-2700MHz.

The third radiator 57 includes a first arm 572, a second arm 574, and a third arm 576 connected in this order. The first arm 572, the second arm 574, and the third arm 576 are located on the same plane. The first arm 572 and the third arm 576 are substantially L-shaped metal arms and are symmetrically connected to opposite ends of the second arm 574, respectively. The second arm 574 is a substantially linear metal arm, and the second arm 574 is disposed at an interval parallel to the first radiator 55. The second feeding portion 58 and the second grounding portion 59 are both substantially linear metal arms, and the two are arranged in parallel with each other. One end of the second feeding portion 58 is substantially vertically connected to the connection between the first arm 572 and the second arm 574, and the other end is electrically connected to the feeding source 68. One end of the second ground portion 59 is substantially vertically connected to one end of the second arm 574 near the first arm 572, and the other end is connected to a ground plane. The third radiator 57 feeds a current from a feed source through the second feeding portion 58. After the current is fed into the third radiator 57, the current flows in two directions, and one direction flows through the second arm 574. And the third arm 576 to excite a fourth mode to generate a radiation signal in the fourth frequency band. In this embodiment, the fourth mode is a WiFi 2.4G mode, and the fourth frequency band is a 2400-2485 MHz frequency band. After the current is fed into the third radiator 57, the other direction of the flow is through the first arm 572, thereby exciting a fifth mode to generate a radiation signal in the fifth frequency band. In this embodiment, the fifth mode is a WiFi 5G mode, and the fifth frequency band is a 5150-5850 MHz frequency band.

In this embodiment, the ground plane may be the metal back plate 512. Alternatively, a shielding mask for shielding electromagnetic interference or a middle frame supporting the display unit 601 may be provided on a side of the display unit 601 facing the metal back plate 512. The mask or the middle frame is made of a metal material. The ground plane may also be the shield or the middle frame. Alternatively, the metal back plate 512 may be connected to the shield or middle frame to form a larger ground plane. The ground plane is the ground of the antenna structure 500. That is, each of the ground portions or ground points is directly or indirectly connected to the ground plane.

In this embodiment, in order to obtain better antenna characteristics, the thickness of the wireless communication device 600 is set to 7.43 mm. The width of the slot 518 may be set to 3-4.5 mm, preferably, 4.43 mm, that is, the radiating section 52 is set to 4.43 mm from the metal back plate 512, so that the radiating section 52 is far away from the radiating section 52. The metal back plate 512 is used to improve the antenna efficiency of the radiation section. The width of the breakpoints 5112, 5114 is set to 1.5-2.5 mm, and preferably, 2 mm, to further improve the antenna efficiency of the radiating section without affecting the overall appearance of the antenna structure 500. . The thickness of the metal front frame 511 may be set to 2 mm, that is, the thickness of the breakpoints 5112 and 5114 may be set to 2 mm.

FIG. 15 is a schematic diagram of a current trend during operation of the antenna structure 500. After the current enters the radiating section 52 from the first feeding part 53, the current flows to both sides, one of which flows through the metal long arm B1 and flows to the first break point 5112 and the first The radiator 55 (refer to the path P1) further excites the LTE-A low-frequency mode. After the current enters the radiating section 52 from the first feeding section 53, it flows through the metal long arm B1 and flows to the grounding section 54 (see path P2), thereby exciting the LTE-A intermediate frequency mode. state. After the current enters the radiating section 52 from the first feeding part 53, it flows in the other direction through the metal short arm B2, and flows to the second break point 5114 and the second radiator 56 (see path P3). ) To further excite the LTE-A high-frequency mode. The third radiator 57 feeds current from the second feeding portion 58 and flows in the directions on both sides, one of which flows through the second arm 574 and the third arm 576 (see path P4), and then excites. The WiFi 2.4G mode. After the third radiator 57 is fed with current from the second feeding portion 58, the other direction of the flow is through the first arm 572 (see path P5), and then the WiFi 5G mode is excited.

The first feeding portion 53 and the first grounding portion 54 are respectively disposed on opposite sides of the USB connector 603. The first radiator 55 and the third radiator 57 are spaced apart from each other above the headphone socket 602. The upper direction refers to a direction toward the display unit 601. The second radiator 56 is disposed between the speaker 607 and a bottom edge of the metal front frame 511.

FIG. 19 is a return loss curve diagram of the antenna structure 500 when the LTE-A is operated in the low-frequency, intermediate-frequency, and high-frequency bands. Among them, curve S191 is the return loss value when the antenna structure 500 works in the 700MHz band; curve S192 is the return loss value when the antenna structure 500 works in the 850MHz band; curve S193 is the return wave when the antenna structure 500 works in the 900MHz frequency band. The loss value; curve S194 is the return loss value when the antenna structure 500 works at the frequency range of 1710-1880MHz; curve S195 is the return loss value when the antenna structure 500 works at the frequency range of 1850-1990MHz; curve S196 is the return loss value of the antenna structure 500 when operating at 1920 The return loss value at the -2170MHz frequency band; curve S197 is the return loss value when the antenna structure 500 works at the 2300-2400MHz frequency band; the curve S198 is the return loss value when the antenna structure 500 works at the 2500-2700MHz frequency band.

FIG. 20 is a return loss curve diagram of the antenna structure 500 when the antenna structure 500 works in the WiFi 2.4G frequency band and the WiFi 5G frequency band. The curve S201 is the return loss value when the antenna structure 500 works in the 2400-2485MHz frequency band, and the curve S202 is the return loss value when the antenna structure 500 works in the 5150-5850MHz frequency band.

FIG. 21 is an efficiency curve diagram of the antenna structure 500 when operating in the LTE-A low-frequency, intermediate-frequency, and high-frequency bands. Among them, curve S211 is the efficiency when the antenna structure 500 works at the 700MHz frequency band; curve S212 is the efficiency when the antenna structure 500 works at the 850MHz frequency band; curve S213 is the efficiency when the antenna structure 500 works at the 900MHz frequency band; curve S214 is the antenna structure 500 Efficiency at 170-1880MHz; curve S215 is the efficiency of the antenna structure 500 operating at 1850-1990MHz; curve S216 is the efficiency of the antenna structure 500 operating at 1920-2170MHz; curve S217 is the antenna structure 500 operating at Efficiency at 2300-2400MHz; curve S218 is the efficiency when antenna structure 500 works at 2500-2700MHz.

FIG. 22 is an efficiency curve diagram of the antenna structure 100 when operating in a WiFi 2.4G frequency band and a WiFi 5G frequency band. Among them, the curve S221 is the efficiency when the antenna structure 500 works in the 2400-2485MHz frequency band, and the curve S202 is the efficiency when the antenna structure 500 works in the 5150-5850MHz frequency band.

Obviously, the working frequency range applicable to the antenna structure 500 covers the LTE-A low frequency band (700-960 MHz), the LTE-A intermediate frequency band (1710-2170MHz), the LTE-A high frequency band (2300-2690MHz), WiFi 2.4G frequency band (2400-2485MHz) and WiFi 5G frequency band (5150-5850MHz), with a wide frequency range, can be applied to the operation of various frequency bands, and when the antenna structure 500 works in the above frequency bands, its working frequency can meet The antenna is designed to work and has better radiation efficiency.

The antenna structure 500 is provided with the metal piece 51, and the slots and breakpoints on the metal piece 51 are provided on the metal front frame 511 and the metal frame 513, but not on the metal back plate. 512, so that the metal back plate 512 constitutes an all-metal structure, that is, the metal back plate 512 does not have insulation slots, disconnections or break points, so that the metal back plate 512 can avoid The setting of lines or breakpoints affects the integrity and aesthetics of the metal back plate 512.

It can be understood that the antenna structure 100 of the first embodiment of the present invention is the upper antenna of the wireless communication device, and the antenna structure 500 of the second embodiment is the lower antenna of the wireless communication device. The upper antenna of the first embodiment may be the same as the lower antenna of the second embodiment. Combination to form an antenna of a wireless communication device. For example, the wireless communication device may use the lower antenna to send a wireless signal, and use the upper antenna and the lower antenna to receive a wireless signal together.

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 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 protection of the present invention.

100‧‧‧ Antenna Structure
11‧‧‧ metal parts
111‧‧‧ metal front frame
112‧‧‧metal back plate
113‧‧‧metal frame
114‧‧‧accommodation space
115‧‧‧Top
116‧‧‧First side
117‧‧‧ second side
118‧‧‧Slotted
1112‧‧‧First breakpoint
1114‧‧‧ Second breakpoint
1116‧‧‧ Third breakpoint
22‧‧‧ the first radiation segment
24‧‧‧Second Radiation Section
26‧‧‧ The third radiation segment
A1‧‧‧ metal short arm
A2‧‧‧metal long arm
13‧‧‧First Feeding Department
14‧‧‧ Ground
15‧‧‧ radiator
16‧‧‧Second Feeding Department
17‧‧‧first matching circuit
L1‧‧‧First inductor
C1‧‧‧first capacitor
L2‧‧‧Second inductor
C2‧‧‧Second capacitor
18‧‧‧ switching circuit
182‧‧‧Switch unit
184‧‧‧switching element
19‧‧‧Second matching circuit
27, 29‧‧‧ feed source
L3‧‧‧Third inductance
200‧‧‧Wireless communication device
201‧‧‧display unit
202‧‧‧ rear dual camera
203‧‧‧ Receiver
204, 205‧‧‧ opening
207‧‧‧Front lens
210‧‧‧Circuit Board Example 2
500‧‧‧ Antenna Structure
51‧‧‧metal parts
511‧‧‧ metal front frame
512‧‧‧metal back plate
513‧‧‧metal frame
514‧‧‧accommodation space
515‧‧‧ bottom
516‧‧‧first side
517‧‧‧second side
518‧‧‧Slotted
5112‧‧‧First breakpoint
5114‧‧‧ Second breakpoint
52‧‧‧ Radiation Section
B1‧‧‧metal long arm
B2‧‧‧ metal short arm
53‧‧‧First Feeding Department
54‧‧‧First ground
55‧‧‧ first radiator
56‧‧‧Second radiator
57‧‧‧Third radiator
572‧‧‧first arm
574‧‧‧second arm
576‧‧‧third arm
58‧‧‧Second Feeding Department
59‧‧‧Second Grounding Section
62‧‧‧ matching circuit
68‧‧‧feed source
C1‧‧‧first capacitor
L1‧‧‧First inductor
L2‧‧‧Second inductor
64‧‧‧first switching circuit
642‧‧‧The first switching unit
644‧‧‧first switching element
66‧‧‧Second switching circuit
642‧‧‧Second switching unit
644‧‧‧Second switching element
600‧‧‧Wireless communication device
601‧‧‧display unit
602‧‧‧Headphone socket
603‧‧‧USB connector
607‧‧‧Speaker
610‧‧‧Circuit Board

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 assembly diagram of the antenna structure shown in FIG. 1. FIG. 3 is a schematic diagram of the wireless communication device shown in FIG. 1 from another angle. FIG. 4 is a current trend diagram of the antenna structure shown in FIG. 2 during operation. FIG. 5 is a circuit diagram of a first matching circuit of an antenna structure according to a first embodiment of the present invention. FIG. 6 is a circuit diagram of a switching circuit with an antenna structure according to the first embodiment of the present invention. FIG. 7 is a circuit diagram of a second matching circuit with an antenna structure according to the first embodiment of the present invention. FIG. 8 is a return loss curve diagram of the first radiating section and the third radiating section of the antenna structure according to the first embodiment of the present invention during operation. FIG. 9 is a return loss curve diagram of the second radiating section 24 of the antenna structure according to the first embodiment of the present invention during operation. FIG. 10 is an efficiency curve diagram of the first radiating section 22 and the third radiating section 26 of the antenna structure according to the second embodiment of the present invention. FIG. 11 is an efficiency curve diagram of the second radiating section 24 of the antenna structure according to the second embodiment of the present invention during operation. FIG. 12 is a schematic diagram of an antenna structure applied to a wireless communication device according to a second embodiment of the present invention. FIG. 13 is an assembly diagram of the antenna structure shown in FIG. 12. FIG. 14 is a schematic diagram of the wireless communication device shown in FIG. 12 from another angle. FIG. 15 is a current trend diagram of the antenna structure shown in FIG. 13 during operation. FIG. 16 is a circuit diagram of a matching circuit of an antenna structure according to a second embodiment of the present invention. FIG. 17 is a circuit diagram of a first switching circuit of an antenna structure according to a second embodiment of the present invention. 18 is a circuit diagram of a second switching circuit of an antenna structure according to a second embodiment of the present invention. FIG. 19 is a return loss curve diagram of the antenna structure according to the second embodiment of the present invention when the antenna structure is operated in the low frequency, intermediate frequency, and high frequency bands. FIG. 20 is a return loss curve diagram of the antenna structure according to the second embodiment of the present invention when it operates in the WiFi 2.4G frequency band and the WiFi 5G frequency band. FIG. 21 is a graph of the efficiency of the antenna structure according to the second embodiment of the present invention when it works in the low frequency, intermediate frequency and high frequency bands. FIG. 22 is a diagram of efficiency curves of the second embodiment of the present invention when operating in the WiFi 2.4G frequency band and the WiFi 5G frequency band.

no

500‧‧‧ Antenna Structure

51‧‧‧metal parts

5112‧‧‧First breakpoint

5114‧‧‧ Second breakpoint

52‧‧‧ Radiation Section

B1‧‧‧metal long arm

B2‧‧‧ metal short arm

53‧‧‧First Feeding Department

54‧‧‧First ground

55‧‧‧ first radiator

56‧‧‧Second radiator

57‧‧‧Third radiator

572‧‧‧first arm

574‧‧‧second arm

576‧‧‧third arm

58‧‧‧Second Feeding Department

59‧‧‧Second Grounding Section

602‧‧‧Headphone socket

603‧‧‧USB connector

607‧‧‧Speaker

610‧‧‧Circuit Board

Claims (19)

An antenna structure includes a metal piece, a first feeding portion, and a first ground portion. The metal piece includes a metal front frame, a metal back plate, and a metal frame. The metal frame is sandwiched between the metal front frame and the metal. Between the back plates, an improvement is that: a slot is formed on the metal frame, a first breakpoint and a second breakpoint are set on the metal front frame, and the first breakpoint and the second breakpoint are respectively set at At the two ends of the slot, the first break point and the second break point communicate with the slot and extend to cut off the metal front frame, and the metal located between the first break point and the second break point The front frame forms a radiating segment, the first feed-in portion and the first ground portion are connected to the radiating segment at intervals, and the antenna structure further includes a first radiator and a second radiator, the first radiator and the second radiator. The radiator is respectively connected to both sides of the radiating section and is disposed near the first breakpoint and the second breakpoint, respectively, and the first ground portion is provided between the first breakpoint and the first feeding portion, A current is fed from the first feeding section to the radiation section and flows along the radiation section The first breakpoint and the first radiator excite a radiation signal in a first frequency band, and a current is fed from the first feeding portion to the radiation segment and flows along the radiation segment to the first ground portion to excite a second A radiation signal of a frequency band, a current is fed from the first feeding part to the radiation section and flows along the radiation section to the second breakpoint and the second radiator to excite a radiation signal of a third frequency band, the second frequency band The frequency of is higher than the frequency of the first frequency band, and the frequency of the third frequency band is higher than the frequency of the second frequency band. The antenna structure according to item 1 of the scope of patent application, wherein the slot and the breakpoint are filled with an insulating material. The antenna structure according to item 1 of the scope of patent application, wherein the antenna structure further includes a matching circuit, a first switching circuit and a second switching circuit, and one end of the feeding portion is connected to the radiating section, and the other end passes through the radiating section. The matching circuit is electrically connected to the feed source. The radiating section is divided into a metal long arm facing the first breakpoint and a metal short arm facing the second breakpoint. The length of the metal long arm uses the feed portion as a separation point. More than the length of the metal short arm. The antenna structure according to item 3 of the scope of patent application, wherein the ground portion is disposed at a distance from the feed portion, one end of which is connected to the metal long arm, and the other end is connected to a ground plane through the first switching circuit. The antenna structure according to item 3 of the patent application scope, wherein the matching circuit includes a first capacitor, a first inductor, and a second inductor, and one end of the first inductor is electrically connected to the first feeding portion and the other end One end of the first capacitor is electrically connected to the first inductor and the feed source, the other end is electrically connected to the ground plane, and one end of the second inductor is electrically connected to the first inductor. Between the inductor and the first feed-in part, the other end is connected to the ground plane. The antenna structure according to item 3 of the scope of patent application, wherein the first radiator is connected to an end of the metal long arm near the first breakpoint, and the first radiator is a substantially straight metal arm. It is connected to the side of the metal front frame where the first breakpoint is disposed, and is substantially parallel to the bottom edge of the metal front frame. The antenna structure according to item 3 of the scope of patent application, wherein one end of the second radiator is connected to an end of the metal short arm near the second breakpoint, and the other end is connected to the antenna via the second switching circuit. On the ground, the second radiator has a substantially L-shaped metal arm and is connected to a side of the metal front frame provided with a second break point. One of the second radiators is substantially parallel to the bottom of the metal front frame. side. The antenna structure of claim 3, wherein the first switching circuit includes a first switching unit and at least one first switching element, and the first switching element is an inductor, a capacitor, or a combination of an inductor and a capacitor. The first switching elements are connected in parallel with each other, and one end thereof is electrically connected to the first switching unit, the other end is electrically connected to a ground plane, and the other end of the first switching unit is electrically connected to the first The grounding part can control the switching of the first switching unit so that the radiating section is switched to different first switching elements through the first grounding part, and each first switching element has different impedance. The antenna structure according to item 8 of the scope of patent application, wherein the second switching circuit includes a second switching unit and at least one second switching element, and the second switching element is an inductor, a capacitor, or a combination of an inductor and a capacitor. The second switching elements are connected in parallel with each other, and one end thereof is electrically connected to the second switching unit, the other end is electrically connected to a ground plane, and the other end of the second switching unit is electrically connected to the second The radiator, by controlling the switching of the second switching unit, can cause the metal short arm to switch to a different second switching element through the second radiator, and each second switching element has a different impedance. The antenna structure according to item 9 of the scope of patent application, wherein the first feeding section feeds current from a feed source through the matching circuit, and after the current is fed into the radiation section, it flows through the metal long arm and flows to The first breakpoint flows to the first radiator, thereby exciting a first mode to generate a radiation signal in a first frequency band, the first mode is an LTE-A low frequency mode, and the first frequency band is 700-960MHz frequency band. The antenna structure according to item 10 of the scope of patent application, wherein the current flows along the long metal arm after being fed into the radiation section, and flows to the first ground portion and the first switching circuit, thereby exciting a second mode To generate a radiation signal in a second frequency band, the second mode is an LTE-A intermediate frequency mode, and the second frequency band is a 1710-2170 MHz frequency band. The antenna structure according to item 11 of the scope of patent application, wherein the current flows into the short metal arm after feeding into the radiation section, flows to the second breakpoint, and flows to the second radiator and the first radiator. The two switching circuits excite a third mode to generate a radiation signal in a third frequency band, the third mode is an LTE-A high frequency mode, and the third frequency band is a 2300-2690 MHz frequency band. The antenna structure according to item 12 of the scope of patent application, wherein the metal long arm can be switched to a different first switching element by controlling the switching of the first switching unit; The switching can cause the metal short arm to switch to a different second switching element. Since each of the first switching element and the second switching element has a different impedance, the first switching unit and the second switching element respectively pass through the The switching can adjust the first frequency band of the first mode of the metal long arm and the third frequency band of the third mode of the metal short arm. The adjustment frequency band is to shift the frequency band toward the low frequency or the high frequency. shift. The antenna structure according to item 1 of the scope of patent application, wherein the antenna structure further includes a third radiator, a second feeding portion, and a second ground portion, and the third radiator includes a first arm, a first Two arms and a third arm, the first arm, the second arm, and the third arm are located on the same plane, and the first and third arms are generally L-shaped metal arms, which are symmetrically connected to the second arm, respectively At the opposite ends of the second arm, the second arm is generally a linear metal arm, and the interval is arranged in parallel with the first radiator. The second feeding portion and the second ground portion are substantially linear metal arms, and the two are spaced apart. In parallel, one end of the second feeding portion is substantially vertically connected to the connection between the first arm and the second arm, and the other end is electrically connected to the feeding source. One end of the second ground portion is substantially vertically connected to an end of the second arm near the first arm, and the other end is connected to a ground plane. The antenna structure according to item 14 of the scope of patent application, wherein the third radiator feeds a current from a feed source through the second feed section, and the current flows in two directions after feeding the third radiator, One direction is flowing through the second arm and the third arm, thereby exciting a fourth mode to generate a radiation signal in a fourth frequency band, the fourth mode is a WiFi 2.4G mode, and the fourth frequency band is In the 2400-2485MHz frequency band, after the current is fed into the third radiator, the other direction of the flow is through the first arm, thereby exciting a fifth mode to generate a radiation signal in the fifth frequency band. The fifth mode It is a WiFi 5G mode, and the fifth frequency band is a frequency band of 5150-5850MHz. The antenna structure according to item 1 of the scope of patent application, wherein the width of the slot is set to 3-4.5 mm, that is, the distance between the radiation section and the metal back plate is set to 3-4.5 mm; the width of the breakpoint Set to 1.5-2.5 mm. The antenna structure according to item 1 of the scope of the patent application, wherein the metal back plate is a single metal piece integrally formed, and the metal back plate is not provided with any insulation slot for dividing the metal back plate. , Broken line or breakpoint. A wireless communication device includes the antenna structure according to any one of claims 1-17. The wireless communication device according to item 18 of the patent application scope, wherein the wireless communication device further includes a headphone socket, a USB connector, and a speaker, and the first feeding portion and the first grounding portion are respectively disposed on the USB connector. On the opposite sides, the first radiator and the third radiator are disposed above the headphone socket at intervals, and the second radiator is disposed between the speaker and the bottom edge of the metal front frame.