Antenna structure and wireless communication device having the same

Abstract

The present invention provides an antenna structure, which includes a shell, a first feeding source, a second feeding source and a resonant circuit. The shell is formed with a first radiating part and a second radiating part arranged at intervals. The first radiating part is grounded, and the second radiating part is provided with a second grounding part. One end of the first feeding source is electrically connected to the first radiating part to feed a current signal into the first radiating part, thereby exciting a first mode, a second mode and a third mode to generate signals of a first frequency band, a second frequency band and a third frequency band. One end of the second feeding source is electrically connected to the second radiating part to feed a current signal into the second radiating part to stimulate a fourth mode to generate a signal of a fourth frequency band. One end of the resonant circuit is grounded, and the other end is electrically connected to the second grounding part. The impedance of the resonant circuit is adjusted, and the first radiating part is coupled through the second radiating part to adjust the third mode. The antenna structure has a relatively wide bandwidth. The present application also provides a wireless communication device having the antenna structure.

Description

Technical Field

[0001] The invention relates to an antenna structure and a wireless communication device having the antenna structure. Background Art

[0002] With the continuous development and evolution of smart mobile communications, mobile phones have become a must-have in people's lives today. Today's mobile phones are moving towards diversified functions, thinness, and faster and more efficient data transmission. Therefore, antenna design becomes more difficult in limited space and complex environments. In the limited space, the full-band design of the forward antenna has other single-band antennas next to the full-band antenna. Adjusting the single-band antenna will inevitably affect the frequency of the full-band antenna. Summary of the invention

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

[0004] An embodiment of the present application provides an antenna structure, the antenna structure comprising a housing, a first feeding source, a second feeding source and a resonant circuit, the housing being provided with a first radiating portion and a second radiating portion spaced apart, the first radiating portion and the second radiating portion being grounded;

[0005] One end of the first feeding source is electrically connected to the first radiating portion to feed a current signal to the first radiating portion, thereby exciting a first mode, a second mode and a third mode to generate signals of a first frequency band, a second frequency band and a third frequency band;

[0006] One end of the second feeding source is electrically connected to the second radiating portion to feed a current signal into the second radiating portion, thereby exciting a fourth mode to generate a signal in a fourth frequency band;

[0007] The second radiating portion is used to adjust the radiation frequency band of the second radiating portion according to the impedance of the resonant circuit;

[0008] The first radiating portion is used to adjust the third mode according to a radiation frequency band of the second radiating portion.

[0009] In one possible implementation manner, a first grounding portion is disposed on the first radiating portion, the first grounding portion is grounded, and a second grounding portion is disposed on the second radiating portion;

[0010] One end of the resonant circuit is grounded, and the other end is electrically connected to the second grounding portion.

[0011] In one possible implementation, a coupling portion is further formed on the shell, and the coupling portion is spaced apart from the first radiating portion. When current is fed into the first radiating portion from the first feeding source, the current flows through the first radiating portion and is coupled to the coupling portion.

[0012] In one possible implementation, the shell includes at least a frame, the frame is provided with breakpoints and gaps, the breakpoints and gaps both pass through and separate the frame, the frame between the breakpoints and the gaps constitute the first radiation part, the frame on the side of the breakpoint away from the radiation part constitutes the second radiation part, and the frame on the side of the gap away from the radiation part constitutes the coupling part.

[0013] In one possible implementation manner, the antenna structure further includes a first matching circuit, and the first matching circuit includes a first matching element, a second matching element, and a third matching element;

[0014] One end of the first matching element is electrically connected to the first feed source, and the other end is electrically connected to one end of the second matching element, one end of the third matching element and the first radiating portion. The other end of the second matching element is grounded, and the other end of the third matching element is grounded. The first matching circuit is used to perform impedance matching on the radiation frequency band of the antenna structure.

[0015] In one possible implementation, the antenna structure also includes a second matching circuit, the second matching circuit includes a fourth matching element and a fifth matching element, one end of the fourth matching element is electrically connected to the second radiating portion, and the other end is electrically connected to the second feed source and one end of the fifth matching element, the other end of the fifth matching element is grounded, and the second matching circuit is used to perform impedance matching on the radiation frequency band of the antenna structure.

[0016] In one possible implementation manner, the antenna structure further includes a switching circuit, one end of the switching circuit is electrically connected to the first ground portion, and the other end of the switching circuit is grounded.

[0017] In one possible implementation manner, the shell further includes a back plate, and the frame is arranged around an edge of the back plate.

[0018] In one possible implementation, the resonant circuit includes a first resonant element and a second resonant element;

[0019] One end of the first resonant element is electrically connected to one end of the second resonant element and the second ground portion, and the other end of the first resonant element is electrically connected to the other end of the second resonant element and the ground.

[0020] An embodiment of the present application also provides a wireless communication device, comprising the antenna structure described above.

[0021] The above-mentioned antenna structure and the wireless communication device having the antenna structure solve the problem of full-band design of the antenna in a limited space by setting the shell and using the breakpoints and gaps on the shell to divide the antenna structure from the shell. If there are other single-band antennas next to the full-band antenna, adjusting the single-band antenna will inevitably affect the frequency of the full-band antenna. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of an antenna structure according to a preferred embodiment of the present invention applied to a wireless communication device.

[0023] Figure 2 for Figure 1 Circuit diagram of the first matching circuit in the antenna structure shown.

[0024] Figure 3 for Figure 1 Circuit diagram of the second matching circuit in the antenna structure shown.

[0025] Figure 4 for Figure 1 Circuit diagram of the resonant circuit in the antenna structure shown.

[0026] Figure 5 This is a graph of the S parameters (scattering parameters) of an antenna structure provided in an embodiment of the present application.

[0027] Figure 6 This is a graph of S parameters (scattering parameters) of another antenna structure provided in an embodiment of the present application.

[0028] Figure 7 This is a graph of S parameters (scattering parameters) of another antenna structure provided in an embodiment of the present application.

[0029] Figure 8 A Smith chart of an antenna structure provided in an embodiment of the present application.

[0030] Fig. 9 This is a graph of S parameters (scattering parameters) of another antenna structure provided in an embodiment of the present application.

[0031] Fig.10 A Smith chart of another antenna structure provided in an embodiment of the present application.

[0032] Main component symbols

[0033] Antenna structure 100

[0034] Wireless communication device 200

[0035] Housing 11

[0036] Resonance circuit 13

[0037] The first matching circuit 14

[0038] The second matching circuit 15

[0039] Switching circuit 16

[0040] Border 17

[0041] Back panel 18

[0042] Accommodation space 19

[0043] End part 171

[0044] The first side portion 172

[0045] Second side portion 173

[0046] Breakpoint 174

[0047] Gap 175

[0048] Substrate 20

[0049] First electronic component 21

[0050] The second electronic component 22

[0051] The third electronic component 23

[0052] Fourth electronic component 24

[0053] Fifth electronic component 25

[0054] Display unit 26

[0055] The first radiation portion 31

[0056] First ground portion 311

[0057] The second radiation portion 32

[0058] The second grounding portion 321

[0059] Coupling part 33

[0060] The first feeding source 121

[0061] The second feed source 122

[0062] The first matching element 141

[0063] The second matching element 142

[0064] The third matching element 143

[0065] Fourth matching element 151

[0066] Fifth matching element 152

[0067] The first resonant element 131

[0068] The second resonant element 132

[0069] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0070] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0071] It should be noted that when an element is referred to as being "electrically connected" to another element, it may be directly on the other element or there may be an element in the middle. When an element is considered to be "electrically connected" to another element, it may be a contact connection, for example, a wire connection, or a contactless connection, for example, a contactless coupling.

[0072] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0073] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0074] See also Figure 1 A preferred embodiment of the present invention provides an antenna structure 100, which can be applied to a wireless communication device 200 such as a mobile phone, a personal digital assistant, etc., to transmit and receive radio waves to transmit and exchange wireless signals.

[0075] The antenna structure 100 includes a housing 11, a resonant circuit 13, a first matching circuit 14, a second matching circuit 15, and a switching circuit 16. The housing 11 may be a housing of the wireless communication device 200. The housing 11 includes at least a back plate 18 and a frame 17. In the embodiment of the present application, the back plate 18 is made of a non-metallic material, such as plastic or glass. The frame 17 is made of a metal material. The back plate 18 and the frame 17 constitute the housing of the wireless communication device 200.

[0076] The frame 17 is generally annular in structure. An opening (not shown) is provided on the frame 17 for accommodating the display unit of the wireless communication device 200. It can be understood that the display unit has a display plane, which is exposed in the opening, and the display plane is arranged substantially parallel to the back plate 18. In the embodiment of the present application, the frame 17 is arranged around the periphery of the back plate 18 to enclose together with the back plate 18 a receiving space 19 having the opening. The receiving space 19 is used to accommodate electronic components or circuit modules such as a circuit board and a processing unit of the wireless communication device 200 therein.

[0077] The frame 17 at least includes an end portion 171, a first side portion 172, and a second side portion 173. In the embodiment of the present application, the end portion 171 is the bottom of the wireless communication device 200. The first side portion 172 and the second side portion 173 are arranged opposite to each other, and are respectively arranged at two ends of the end portion 171, preferably vertically arranged. The end portion 171, the first side portion 172, and the second side portion 173 are all vertically connected to the back plate 18.

[0078] The frame 17 is also provided with a port (not shown), a breakpoint 174 and a gap 175. The port is provided at the middle of the end portion 171 and passes through the end portion 171.

[0079] The wireless communication device 200 also includes a substrate 20 and at least one electronic component. The substrate 20 is a printed circuit board (PCB), which can be made of a dielectric material such as epoxy resin glass fiber (FR4). In the embodiment of the present application, the wireless communication device 200 includes at least five electronic components, namely a first electronic component 21, a second electronic component 22, a third electronic component 23, a fourth electronic component 24 and a fifth electronic component 25. Among them, the first electronic component 21 is a Universal Serial Bus (USB) interface module, which is arranged in the accommodating space 19, adjacent to and electrically connected to the substrate 20. The first electronic component 21 corresponds to the port so that the first electronic component 21 is partially exposed from the port. In this way, a user can insert a USB device through the port and establish an electrical connection with the first electronic component 21.

[0080] The second electronic component 22 is a microphone, which is disposed in the accommodating space 19 and is located between the gap 175 and the first electronic component 21. The third electronic component 23 is a battery, which is disposed in the accommodating space 19 and is spaced apart from the first electronic component 21 and the second electronic component 22. The fourth electronic component 24 is a speaker. The fourth electronic component 24 is disposed in the accommodating space 19 and is located between the substrate 20 and the first side portion 172. The fifth electronic component 25 is a vibrator. The fifth electronic component 25 is disposed in the accommodating space 19 and is located between the substrate 20 and the second side portion 173.

[0081] In the embodiment of the present application, the breakpoint 174 is provided in the frame 17 between the port and the first side portion 172. The slit 175 is provided in the frame 17 between the port and the second side portion 173, that is, the breakpoint 174 and the slit 175 are respectively provided on both sides of the port. In the embodiment of the present application, the breakpoint 174 and the slit 175 both penetrate and separate the frame 17, thereby dividing the frame 17 into three parts, namely, the first radiation portion 31, the second radiation portion 32 and the coupling portion 33. Among them, the frame 17 between the breakpoint 174 and the slit 175 forms the first radiation portion 31. The frame 17 adjacent to the first side portion 172 of the breakpoint 174 forms the coupling portion 33. The frame 17 adjacent to the second side portion 173 of the slit 175 away from the breakpoint 174 forms the second radiation portion 32. In the embodiment of the present application, the first radiation portion 31 and the second radiation portion 32 are both grounded. The first radiating portion 31 is composed of a full-frequency antenna, and the second radiating portion 32 is composed of a single-frequency antenna.

[0082] In the embodiment of the present application, the breakpoints 174 and the gaps 175 are filled with insulating materials (such as plastic, rubber, glass, wood, ceramics, etc., but not limited thereto) to separate the first radiation portion 31 , the coupling portion 33 and the second radiation portion 32 .

[0083] The first feeding source 121 and the second feeding source 122 are disposed in the accommodating space 19 , and the first feeding source 121 and the second feeding source 122 can be electrically connected to the substrate 20 .

[0084] The first feeding source 121 is electrically connected to the first radiating portion 31 through the first matching circuit 14. When the current is fed from the first feeding source 121, the current flows through the first radiating portion 31 to feed the current signal to the first radiating portion 31, thereby exciting the first mode, the second mode and the third mode to generate signals of the first frequency band, the second frequency band and the third frequency band. Specifically, a portion of the current can flow through the first radiating portion 31 and be coupled to the coupling portion 33 through the breakpoint 174, thereby making the first feeding source 121, the first radiating portion 31 and the coupling portion 33 form a coupled feeding antenna, thereby exciting the second mode to generate a radiation signal of the second frequency band.

[0085] In an embodiment of the present application, the frequency of the third frequency band is higher than the frequency of the second frequency band, and the frequency of the second frequency band is higher than the frequency of the first frequency band. Specifically, the first mode is the LTE low frequency mode, and the first frequency band is the 699-960MHz frequency band. The second mode is the LTE medium frequency mode, and the second frequency band is the 1710-2170MHz frequency band. The third mode is the LTE high frequency mode, and the third frequency band is the 2490-2690 frequency band.

[0086] Please also read Figure 2 In the embodiment of the present application, the first matching circuit 14 is used to perform impedance matching on the radiation frequency band of the antenna structure 100. The first matching circuit 14 includes a first matching element 141, a second matching element 142 and a third matching element 143, one end of the first matching element 141 is electrically connected to the first feeding source 121, and the other end is electrically connected to one end of the second matching element 142, one end of the third matching element 143 and the first radiating portion 31, the other end of the second matching element 142 is grounded, and the other end of the third matching element 143 is grounded.

[0087] In the embodiment of the present application, the first matching element 141 is a capacitor. The second matching element 142 is a capacitor. The third matching element 143 is an inductor. The capacitance value of the first matching element 141 is 1.5 pF. The capacitance value of the second matching element 142 is 0.6 pF. The inductance value of the third matching element 143 is 6.3 nH. Of course, in other embodiments, the first matching element 141, the second matching element 142 and the third matching element 143 are not limited to the inductors and capacitors described above, and they can also be other matching elements or combinations thereof.

[0088] The second feeding source 122 is electrically connected to the second radiating portion 32 through the second matching circuit 15. When the current is fed from the second feeding source 122, the current flows through the second radiating portion 32 to feed the current signal to the second radiating portion 32, thereby exciting the fourth mode and / or the fifth mode to generate a signal in the fourth frequency band and / or the fifth frequency band. Specifically, a portion of the current can flow through the second radiating portion 32 and be coupled to the first radiating portion 31 through the slot 175, thereby making the second feeding source 122, the first radiating portion 31 and the second radiating portion 32 form a coupled feeding antenna, thereby adjusting the third mode of the first radiating portion 31.

[0089] In the implementation of the present application, the frequency of the fourth frequency band is lower than the frequency of the third frequency band, and the frequency of the fourth frequency band is higher than the frequency of the second frequency band. Specifically, the fourth mode is a high frequency mode, and the fourth frequency band is 1400-1500MHz. The fifth mode is a GPS working mode, and the fifth frequency band is 1575.42MHz.

[0090] Please also read Figure 3 In the embodiment of the present application, the second matching circuit 15 is used to perform impedance matching on the radiation frequency band of the antenna structure 100. The second matching circuit includes a fourth matching element 151 and a fifth matching element 152, one end of the fourth matching element 151 is electrically connected to the second radiation portion 32, and the other end is electrically connected to the second feeding source 122 and one end of the fifth matching element 152, and the other end of the fifth matching element 152 is grounded.

[0091] In the embodiment of the present application, the fourth matching element 151 is an inductor. The fifth matching element 152 is a capacitor, and the inductance value of the fourth matching element is 3.9nH. The capacitance value of the fifth matching element 152 is 3.6pF. Of course, in other embodiments, the fourth matching element 151 and the fifth matching element 152 are not limited to the inductors and capacitors described above, and they can also be other matching elements or combinations thereof.

[0092] Please refer again Figure 1 In the embodiment of the present application, the antenna structure 100 further includes a switching circuit 16, and the switching circuit 16 is used to adjust the working mode of the first radiating portion 31. One end of the switching circuit 16 is electrically connected to the first grounding portion 311, and the other end is grounded. In one possible implementation, the switching circuit 16 includes a switch and at least one reactance device.

[0093] Please also read Figure 4In the embodiment of the present application, the antenna structure 100 further includes a resonant circuit 13. The resonant circuit 13 is disposed in the accommodation space 19 and is located between the substrate 20 and the second radiation portion 32. The embodiment of the present application does not specifically limit the position of the resonant circuit 13.

[0094] like Figure 4 As shown, by finely adjusting the resonant circuit 13 of the second radiating portion 32, the high frequency change of the first radiating portion 31 is adjusted accordingly. The resonant circuit 13 includes a first resonant element 131 and a second resonant element 132, one end of the first resonant element 131 is electrically connected to one end of the second resonant element 132 and the second grounding portion 321, and the other end of the first resonant element 131 is electrically connected to the other end of the second resonant element 132 and the ground.

[0095] In the embodiment of the present application, the first resonant element 131 is an inductor. The second resonant element 132 is a capacitor. In one possible implementation, the first resonant element 131 is a capacitor. The second resonant element 132 is an inductor. The present application does not make any specific limitation on this.

[0096] In an embodiment of the present application, the resonant frequency of the resonant circuit 13 is calculated, the resonant frequency of the resonant circuit 13 is set to the third frequency band (2490-2690MHz), the capacitance value of the resonant circuit 13 is adjusted, and then the resonant frequency of the resonant circuit 13 is changed, and the working frequency band of the second radiating part 32 is changed, affecting the end of the second radiating part 32, and the second radiating part 32 is coupled with the first radiating part 31, and then by adjusting the capacitance value of the resonant circuit 13, the offset of the LTE high-frequency mode can be adjusted, and the fourth frequency band 2490-2690MHz of the first radiating part 31 is adjusted to achieve reception and transmission in the high-frequency band 2490-2690MHz.

[0097] Figure 5 1 is a graph of an S parameter (scattering parameter) of an antenna structure provided in an embodiment of the present application. When current is fed into the first feed source 121 and flows from the first feed source 121 through the first radiation portion 31, the S parameter (scattering parameter) curve of the antenna structure 100 is as shown in FIG. Figure 5 shown. Figure 6 FIG. 1 is a graph of an S parameter (scattering parameter) of another antenna structure provided in an embodiment of the present application. When current is fed into the second feed source 122 and flows from the second feed source 122 through the second radiation portion 32, the S parameter (scattering parameter) curve of the antenna structure 100 is as shown in FIG. Figure 6 shown.

[0098] Figure 7This is a graph of S parameter (scattering parameter) of another antenna structure provided in an embodiment of the present application. By changing the capacitance value of the resonant circuit 13, the S parameter (scattering parameter) curve of the antenna structure 100 is as follows: Figure 7 shown. Figure 8 This is a Smith chart of an antenna structure provided in an embodiment of the present application. When the capacitance value of the resonant circuit 13 is changed, the Smith chart of the antenna structure 100 is as follows: Figure 8 As shown. Figure 7 and Figure 8 As shown, the capacitance values ​​are changed to 0.6pF, 0.9pF and 1.2pF respectively.

[0099] Fig. 9 This is a graph of S parameter (scattering parameter) of another antenna structure provided in an embodiment of the present application. By changing the inductance value of the resonant circuit 13, the S parameter (scattering parameter) curve of the antenna structure 100 is as follows: Fig. 9 shown. Fig.10 This is another Smith chart of an antenna structure provided in an embodiment of the present application. When the inductance value of the resonant circuit 13 is changed, the Smith chart of the antenna structure 100 is as follows: Fig.10 As shown. Fig. 9 and Fig.10 As shown, the capacitance values ​​are changed to 4.3nH, 4.7nH and 5.1nH respectively.

[0100] Obviously, from Figures 5 to 10 It can be seen that the antenna structure 100 can work in the corresponding LTE low-frequency band, such as the 699-960MHz band. In addition, the antenna structure 100 can also work in the LTE medium-frequency band, such as the 1710-2170MHz band. In addition, the antenna structure 100 can also work in the LTE high-frequency band, such as the 2490-2690 band, that is, covering the low, medium and high frequency bands, that is, covering the low frequency (699-960MHz), medium frequency (1710-2170Mz) and high frequency (2490-2690MHz) that 4G LTE mobile phones must cover. In addition, the antenna structure 100 can also work in the 1.5GHz band (1400~1500MHz) and cover the GPS (1575.42MHz) band, with a wider frequency range. And when the antenna structure 100 works in the above-mentioned frequency bands, its operating frequency can meet the antenna working design requirements and has better radiation efficiency.

[0101] As described in the previous embodiments, the antenna structure 100 is provided with the breakpoint 174 and the gap 175 to divide the first radiation part 31, the second radiation part 32, and the coupling part 33 from the frame 17. The antenna structure 100 is also provided with a first feeding source 121 and a second feeding source 122. The current of the first feeding source 121 is fed into the first radiation part 31 and coupled to the coupling part 33 to excite the first mode, the second mode and the third mode to generate a low frequency band, a medium frequency band and a high frequency band. The current of the second feeding source 122 is fed into the second radiation part 32 to excite a fourth mode to generate a fourth frequency band.

[0102] In addition, the first radiating part 31 is a full-frequency antenna, and the second radiating part 32 is a single-frequency antenna. Adjusting the single-frequency antenna will affect the frequency of the full-frequency antenna. To this end, by adjusting the resonant frequency of the resonant circuit 13 electrically connected to the second radiating part 32, the resonant frequency of the resonant circuit 13 is set to the high-frequency band, thereby affecting the working frequency band of the second radiating part 32. The second radiating part 32 is coupled to the first radiating part 31, thereby adjusting the offset of the high-frequency mode of the first radiating part 31, and effectively adjusting the change of the high-frequency (2490-2690MHz) band.

[0103] In addition, the antenna structure 100 is provided with the housing 11, and the breakpoints 174 and the gaps 175 on the housing 11 are both provided on the frame 17, and are not provided on the back plate 18. In this way, the antenna structure 100 can provide corresponding low, medium and high frequency antennas only by using the frame 17, and the back plate 18 can be made of non-metallic materials as a whole, which is more complete and beautiful, and can effectively adapt to the trend of smaller and smaller clearance areas of mobile phone antennas, and can effectively ensure the stability of wireless signal reception.

[0104] The above embodiments are only used to illustrate the technical solution of the present invention and are not intended to limit it. Although the present invention is described in detail with reference to the above preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention. Those skilled in the art may also make other changes within the spirit of the present invention and apply them to the design of the present invention, as long as they do not deviate from the technical effects of the present invention. These changes made according to the spirit of the present invention should be included in the scope of protection claimed by the present invention.

Claims

1. An antenna structure, characterized in that: The antenna structure comprises a shell, a first feeding source, a second feeding source and a resonant circuit, wherein a first radiating portion and a second radiating portion are formed on the shell and are spaced apart from each other, and both the first radiating portion and the second radiating portion are grounded; wherein one end of the resonant circuit is connected to an end of the second radiating portion close to the first radiating portion, and the other end of the resonant circuit is grounded; One end of the first feeding source is electrically connected to the first radiating portion to feed a current signal to the first radiating portion, thereby exciting a first mode, a second mode and a third mode to generate signals of a first frequency band, a second frequency band and a third frequency band; One end of the second feeding source is electrically connected to the second radiating portion to feed a current signal into the second radiating portion, thereby exciting a fourth mode to generate a signal in a fourth frequency band; The second radiating portion is used to adjust the radiation frequency band of the second radiating portion according to the impedance of the resonant circuit; The first radiating portion is used to adjust the third mode according to a radiation frequency band of the second radiating portion.

2. The antenna structure according to claim 1, characterized in that: A first grounding portion is disposed on the first radiating portion, the first grounding portion is grounded, and a second grounding portion is disposed on the second radiating portion; The resonant circuit is connected to the second radiating portion through the second ground portion.

3. The antenna structure according to claim 1, wherein: A coupling portion is also formed on the housing, and the coupling portion is spaced apart from the first radiating portion. When current is fed into the first radiating portion from the first feeding source, the current flows through the first radiating portion and is coupled to the coupling portion.

4. The antenna structure according to claim 3, characterized in that: The shell at least includes a frame, and the frame is provided with breakpoints and gaps, the breakpoints and the gaps both pass through and separate the frame, the frame between the breakpoints and the gaps constitutes the first radiation part, the frame on the side of the breakpoint away from the radiation part constitutes the second radiation part, and the frame on the side of the gap away from the radiation part constitutes the coupling part.

5. The antenna structure according to claim 1, wherein: The antenna structure further includes a first matching circuit, wherein the first matching circuit includes a first matching element, a second matching element, and a third matching element; One end of the first matching element is electrically connected to the first feed source, and the other end is electrically connected to one end of the second matching element, one end of the third matching element and the first radiating portion. The other end of the second matching element is grounded, and the other end of the third matching element is grounded. The first matching circuit is used to perform impedance matching on the radiation frequency band of the antenna structure.

6. The antenna structure according to claim 1, characterized in that: The antenna structure also includes a second matching circuit, which includes a fourth matching element and a fifth matching element. One end of the fourth matching element is electrically connected to the second radiating portion, and the other end is electrically connected to the second feed source and one end of the fifth matching element. The other end of the fifth matching element is grounded. The second matching circuit is used to perform impedance matching on the radiation frequency band of the antenna structure.

7. The antenna structure according to claim 2, characterized in that: The antenna structure further includes a switching circuit, one end of which is electrically connected to the first grounding portion, and the other end of which is grounded.

8. The antenna structure according to claim 4, characterized in that: The shell also includes a back plate, and the frame is arranged around the edge of the back plate.

9. The antenna structure according to claim 2, characterized in that: The resonant circuit comprises a first resonant element and a second resonant element; One end of the first resonant element is electrically connected to one end of the second resonant element and the second ground portion, and the other end of the first resonant element is electrically connected to the other end of the second resonant element and the ground.

10. A wireless communication device, characterized in that: The invention comprises the antenna structure as claimed in any one of claims 1 to 9.

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