TWI665826B - Antenna structure and wireless communication device using the same - Google Patents

Abstract

An antenna structure includes an annular metal frame, a first feed source, and a second feed source. The annular metal frame is provided with a notch portion, a first radiating portion and a second radiating portion, and the first feeding The source feeds the current signal to the first radiating portion, so that the first radiating portion simultaneously excites the first mode and the second mode to generate radiation signals of the first frequency band and the second frequency band; The feeding source feeds the current signal to the second radiating portion, so that the second radiating portion simultaneously excites the third mode and the fourth mode to generate the radiation signals of the third frequency band and the fourth frequency band. The present invention also provides a wireless communication device having the antenna structure.

Description

Antenna structure and wireless communication device having the same

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

With the advancement of wireless communication technology, wireless communication devices are constantly moving toward a thin and light trend, and consumers are increasingly demanding the appearance of products. Since the metal casing has advantages in appearance, mechanism strength, heat dissipation effect, etc., more and more manufacturers have designed wireless communication devices with metal casings, such as metal back plates, to meet the needs of consumers. However, the metal casing easily interferes with the signal radiated by the antenna disposed therein, and the broadband design is not easily achieved, resulting in poor radiation performance of the built-in antenna.

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

An antenna structure includes an annular metal frame, a first feed source, and a second feed source. The annular metal frame is provided with a notch, a first radiating portion, and a first a second radiating portion, the first feeding source is electrically connected to the first radiating portion to feed a current signal to the first radiating portion, thereby causing the first radiating portion to simultaneously excite the first mode and the first a second mode to generate a radiation signal of the first frequency band and the second frequency band; the second feed source is electrically connected to the second radiation The second radiating portion feeds the current signal, so that the second radiating portion simultaneously excites the third mode and the fourth mode to generate radiation signals of the third frequency band and the fourth frequency band; The frequency of the second frequency band is higher than the frequency of the first frequency band, and the frequency of the fourth frequency band is higher than the frequency of the third frequency band.

An embodiment of the present invention provides a wireless communication device including a motherboard and the antenna structure.

The above antenna structure and the wireless communication device having the antenna structure can cover the LTE-A low, medium and high frequency frequency bands, the GPS frequency band and the WIFI 2.4 GHz frequency band, and the frequency range is wide.

100‧‧‧Antenna structure

200‧‧‧ third antenna

10‧‧‧ motherboard

20‧‧‧Ring metal frame

30‧‧‧USB components

40‧‧‧First switching circuit

70‧‧‧Second switching circuit

O1‧‧‧ first endpoint

O2‧‧‧ second endpoint

101‧‧‧ first side

102‧‧‧Second side

103‧‧‧ third side

104‧‧‧ fourth side

111‧‧‧First Radiation Arm

112‧‧‧second radiation arm

113‧‧‧ Third Radiation Arm

114‧‧‧fourth radial arm

115‧‧‧ fifth radiation arm

116‧‧‧ Sixth Radiation Arm

117‧‧‧ seventh radial arm

118‧‧‧ eighth radiation arm

401‧‧‧First switching unit

402‧‧‧Switching components

F1‧‧‧first feed source

F2‧‧‧second feed source

H1‧‧‧First Radiation Department

H2‧‧‧Second Radiation Department

G1‧‧‧First grounding

G2‧‧‧Second grounding

G3‧‧‧ Third grounding

G4‧‧‧fourth grounding

G5‧‧‧ fifth grounding

G6‧‧‧ sixth grounding

H11‧‧‧ first branch

H12‧‧‧Second branch

H21‧‧‧ third branch

H22‧‧‧ fourth branch

L11‧‧‧First adjustable inductance

L22‧‧‧Second adjustable inductor

P5‧‧‧Matching components

1 is a schematic diagram of an antenna structure applied to a wireless communication device in accordance with a preferred embodiment of the present invention.

2 is a schematic view of the antenna structure of FIG. 1 at an angle.

3 is a schematic view of the antenna structure of FIG. 1 at another angle.

4 is a circuit diagram of the antenna structure shown in FIG. 1.

FIG. 5 is a schematic diagram of current flow of the antenna structure shown in FIG. 1.

FIG. 6 is a graph of S parameters (scattering parameters) when the main antenna operates in a low intermediate frequency mode according to an embodiment.

7 is a graph showing the total radiation efficiency of an antenna structure according to an embodiment when operating in a medium-high frequency mode.

FIG. 8 is a graph of S parameters (scattering parameters) when the main antenna of the embodiment operates in a low frequency mode.

9 is a graph showing the total radiation efficiency of an antenna structure according to an embodiment when operating in a low frequency mode.

FIG. 10 is a graph of S-parameters (scattering parameters) when the diversity antenna of the embodiment operates in a low-frequency mode and a GPS mode.

11 is a graph showing the total radiation efficiency of a diversity antenna of an antenna structure according to an embodiment when operating in a low-frequency mode and a GPS mode.

FIG. 12 is a schematic diagram of an antenna structure according to another embodiment of the present invention.

FIG. 13 is a graph showing an S parameter (scattering parameter) when the antenna structure of another embodiment operates in a medium-high frequency mode.

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

It should be noted that when an element is referred to as being "electrically connected" to another element, it can be directly on the other element or the element can be present. When an element is considered to be "electrically connected" to another element, it can be a contact connection, for example, either a wire connection or a non-contact connection, for example, a non-contact coupling.

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

Some embodiments of the present invention are described in detail below with reference to the accompanying drawings. The features of the embodiments and examples described below can be combined with each other without conflict.

Referring to FIG. 1 and FIG. 2, the antenna structure 100 of the preferred embodiment of the present invention is used in a wireless communication device (not shown) for transmitting and receiving radio waves to transmit and exchange wireless signals. The wireless communication device may be a wireless communication device such as a mobile phone or a personal digital assistant. The wireless communication device includes an antenna structure 100 and a motherboard 10.

The antenna structure 100 includes an annular metal frame 20, a first feed source F1, and a second feed source F2. The annular metal frame 20 is preferably an annular metal structure having a notch portion 25, and the annular metal frame 20 is provided The first radiating portion H1 and the second radiating portion H2 are disposed. The annular metal frame 20 may be disposed around the motherboard 10. In the present embodiment, the height h1 of the annular metal frame 20 is about 7 mm, and the gap d1 between the annular metal frame 20 and the motherboard 10 is about 2 mm. The USB component 30 is disposed at an intermediate position at the bottom of the motherboard 10. The USB component 30 can be used to charge and transfer data to the wireless communication device.

The notch portion 25 has a width of about 10 mm, and the notch portion 25 can be used for inserting a SIM card or an SD card, or for mounting a power button, a volume button, or a headphone jack. The notch portion 25 can be made of plastic, ceramic or other non-metallic, non-conductive material.

The first feeding source F1 is electrically connected to the first radiating portion H1 to feed the current signal to the first radiating portion H1, so that the first radiating portion H1 simultaneously excites the first mode and the second mode to generate the first frequency band. And the radiation signal of the second frequency band. The second feeding source F2 is electrically connected to the second radiating portion H2 to feed the current signal to the second radiating portion H2, so that the second radiating portion H2 simultaneously excites the third mode and the fourth mode to generate the third frequency band. And the radiation signal of the fourth frequency band. The frequency of the second frequency band is higher than the frequency of the first frequency band, and the frequency of the fourth frequency band is higher than the frequency of the third frequency band.

In one embodiment, the antenna structure 100 further includes a first ground portion G1, a second ground portion G2, a third ground portion G3, and a fourth ground portion G4 electrically connected to the annular metal frame 20, wherein the four ground portions are The antenna structure 100 provides grounding. The annular metal frame 20 is divided into the first radiation portion H1, the second radiation portion H2, and the isolation portion IS1 by the first ground portion G1, the second ground portion G2, the third ground portion G3, and the fourth ground portion G4. . The notch portion 25 is located between the first ground portion G1 and the fourth ground portion G4, and the isolation portion IS1 is located between the second ground portion G2 and the third ground portion G3. The first radiating portion H1, the first feeding source F1, the first grounding portion G1, and the second grounding portion G2 may constitute a first antenna (main antenna); a second radiating portion H2, a second feeding source F2, and a third The ground portion G3 and the fourth ground portion G4 may constitute a second antenna (diversity antenna, also referred to as a sub-antenna). The isolation portion IS1 is located between the first radiation portion H1 and the second radiation portion H2 for increasing the isolation between the first antenna and the second antenna.

The annular metal frame 20 is preferably a rectangular ring structure. The annular metal frame 20 includes a first end point O1, a second end point O2, a first side edge 101, a second side edge 102, a third side edge 103, and a fourth side edge 104. The first side 101 is provided with an opening to expose the USB component 30, as shown in FIG. The first end point O1 and the second end point O2 are disposed on the second side 102, and the notch portion 25 is formed between the first end point O1 and the second end point O2. The first feed source F1 is electrically connected to the first side 101, and the intersection of the first feed source F1 and the first side 101 is close to the fourth side 104. The second feed source F2 is electrically connected to the third side 103, and the intersection of the second feed source F2 and the third side 103 is close to the second side 102. The first ground portion G1 is electrically connected to the first end point O1. The second ground portion G2 is electrically connected to the fourth side 104, and the intersection of the second ground portion G2 and the fourth side 104 is adjacent to the first side 101. The third grounding portion G3 is electrically connected between the matching element P5 and the fourth side 104, and the intersection of the third grounding portion G3 and the fourth side 104 is adjacent to the third side 103. The fourth ground portion G4 is electrically connected to the second end point O2. One end of the matching element P5 is electrically connected to the third ground portion G3, and the other end is grounded. The matching component P5 may be an inductor, a capacitor or a resistor for matching the impedance of the second radiating portion H2.

In the annular metal frame 20, a portion of the first feed source F1 to the first ground portion G1 forms a first branch H11, and a portion of the first feed source F1 to the second ground portion G2 forms a second branch H12. The first branch H11 is used to excite the first mode, and the second branch H12 is used to excite the second mode. In the annular metal frame 20, a portion of the second feed source F2 to the third ground portion G3 forms a third branch H21, and a portion of the second feed source F2 to the fourth ground portion G4 forms a fourth branch H22. The third branch H21 is used to excite the third mode, and the fourth branch H22 is used to excite the fourth mode.

It can be understood that, in this embodiment, the first feed source F1, the first branch H11, and the first ground portion G1 constitute an inverted F antenna, thereby exciting a first mode to generate a radiation signal of the first frequency band. The first feed source F1, the second branch H12, and the second ground portion G2 constitute another inverted F-type antenna, thereby exciting a second mode to generate a radiation signal of the second frequency band. In this embodiment, the first mode includes a Long Term Evolution Advanced (LTE-A) low frequency and intermediate frequency mode, and the second mode is an LTE-A high frequency mode. The frequency of the second frequency band is higher than the frequency of the first frequency band. The first frequency band includes 700-960 MHz and 1710-2300 MHz frequency bands, and the second frequency band is 2300-2690 MHz frequency band.

The second feed source F2, the third branch H21 and the third ground portion G3 form an inverted F-type antenna, thereby exciting a third mode to generate a radiation signal of the third frequency band. The second feed source F2, the fourth branch H22, and the fourth ground portion G4 constitute another inverted F-type antenna, thereby exciting a fourth mode to generate a radiation signal of the fourth frequency band. In this embodiment, the third mode is a low frequency mode of LTE-A, and the fourth mode is a medium frequency mode of LTE-A. The frequency of the fourth frequency band is higher than the frequency of the third frequency band. The third frequency band is a 734-960 MHz frequency band, and the fourth frequency band includes a frequency band of 1800-2170 MHz and 2300-2700 MHz.

In an embodiment, the diversity antenna covers the GPS frequency band, so the diversity antenna can be used to receive the GPS signal at the same time, and the GPS signal can be separated from the wireless signal received by the diversity antenna by adding a duplexer or a signal extractor.

The first branch H11 includes a first radiating arm 111 and a first radiating arm 112, and the first radiating arm 111 and the first radiating arm 112 are both substantially straight. One end of the first radiating arm 111 is substantially perpendicularly connected to one end of the first radiating arm 112, and the first feeding source F1 is electrically connected to the other end of the first radiating arm 111, and the first grounding portion G1 is electrically connected to the first radiating arm The other end of 112. The second branch H12 includes a third radiating arm 113 and a fourth radiating arm 114, and the third radiating arm 113 and the fourth radiating arm 114 are both substantially straight. One end of the third radiating arm 113 is substantially perpendicularly connected to one end of the fourth radiating arm 114, the first feeding source F1 is electrically connected to the other end of the third radiating arm 113, and the second grounding portion G2 is electrically connected to the fourth radiating arm. The other end of 114. The third branch H21 includes a fifth radiating arm 115 and a sixth radiating arm 116, and the fifth radiating arm 115 and the sixth radiating arm 116 are both substantially straight. One end of the fifth radiating arm 115 is substantially perpendicularly connected to one end of the sixth radiating arm 116, the second feeding source F2 is electrically connected to the other end of the fifth radiating arm 115, and the third grounding portion G3 is electrically connected to the sixth radiating arm. The other end of 116. The fourth branch H22 includes a seventh radiating arm 117 and an eighth radiating arm 118, and the seventh radiating arm 117 and the eighth radiating arm 118 are both substantially straight. One end and the eighth end of the seventh radiating arm 117 One end of the radiating arm 118 is substantially vertically connected, the second feeding source F2 is electrically connected to the other end of the seventh radiating arm 117, and the fourth grounding portion G4 is electrically connected to the other end of the eighth radiating arm 118.

Referring to FIG. 1 and FIG. 3, in order to make the first radiating portion H1 have a preferred low frequency bandwidth, the antenna structure 100 may further include a fifth ground portion G5 and a first switching circuit 40. The first switching circuit 40 is disposed on the motherboard 10. The first switching circuit 40 can include a first adjustable inductor L11. The fifth grounding portion G5 is electrically connected between the first radiating arm 111 of the first branch H11 and the first adjustable inductor L11. One end of the first adjustable inductor L11 is electrically connected to the fifth ground portion G5, and the other end of the first adjustable inductor L11 is grounded. The low frequency band of the first radiating portion H1 is adjusted by adjusting the inductance value of the first adjustable inductor L11.

In an embodiment, the first switching circuit 40 can be implemented in the manner of FIG. In this embodiment, the first switching circuit 40 includes a first switching unit 401 and a plurality of switching elements 402. The first switching unit 401 is electrically connected to the fifth ground portion G5. Each switching element 402 can be an inductor, a capacitor, or a combination of an inductor and a capacitor. The switching elements 402 are connected in parallel with each other, and one end thereof is electrically connected to the first switching unit 401, and the other end is grounded. As such, by controlling the switching of the first switching unit 401, the first radiating arm 111 of the first branch H11 can be switched to a different switching component 402. Since each switching element 402 has a different impedance, the low frequency band of the first antenna can be effectively adjusted by the switching of the first switching unit 401. For example, the switching element 402 can include five inductors connected in parallel, the inductance values of the five inductors being 5nH, 10nH, 30nH, 60nH, 90nH, respectively.

Referring to FIG. 1 and FIG. 5, in order to make the second radiating portion H2 have a preferred low frequency bandwidth, the antenna structure 100 further includes a sixth ground portion G6 and a second switching circuit 70. The second switching circuit 70 is disposed on the motherboard 10. The second switching circuit 70 can include a second adjustable inductor L22. The sixth grounding portion G6 is electrically connected between the fifth radiating arm 115 of the third branch H21 and the second adjustable inductor L22. One end of the second adjustable inductor L22 is electrically connected to the sixth ground portion G6, and the other end of the second adjustable inductor L22 is grounded. By adjusting the inductance value of the second adjustable inductor L22, the second radiating portion H2 can be adjusted to have Low frequency band. second The switching circuit 70 can also be the above-described switching circuit composed of the first switching unit 401 and the plurality of switching elements 402.

Referring to FIG. 1, it can be understood that, in this embodiment, when a current is fed from the first feed source F1, a part of current will flow through the first branch H11 of the first radiating portion H1, thereby exciting the chamber. The first mode is described to generate a radiation signal of the first frequency band (refer to path P1). A further portion of the current will flow through the second branch H12 of the first radiating portion H1, thereby exciting the second mode to generate a radiation signal of the second frequency band (refer to path P2).

When a current is fed from the second feed source F2, a portion of the current will flow through the third branch H21 of the second radiating portion H2, thereby exciting the third mode to generate a radiation signal of the third frequency band ( Refer to path P3). A further portion of the current will flow through the fourth branch H22 of the second radiating portion H2, thereby exciting the fourth mode to produce a fourth band of radiated signals (see path P4).

FIG. 6 is a graph of S parameters (scattering parameters) when the antenna structure 100 operates in the high frequency mode of the LTE-A. The curve S110 is an S value when the first antenna (main antenna) in the antenna structure 100 operates in the high frequency mode of the LTE-A. The curve S111 is an S value when the second antenna (diversity antenna) in the antenna structure 100 operates in the high frequency mode in the LTE-A. The curve S112 is the isolation when the first antenna (main antenna) and the second antenna (diversity antenna) in the antenna structure 100 operate in the high frequency mode in the LTE-A. Wherein, the isolation between the first antenna and the second antenna is greater than 10 dB.

7 is a graph showing the total radiation efficiency of the antenna structure 100 when operating in a high frequency mode in LTE-A. The curve S12 is a radiation efficiency diagram when the first antenna (main antenna) in the antenna structure 100 operates in the high frequency mode of the LTE-A. The curve S13 is a graph of the total radiation efficiency when the first antenna operates in the high frequency mode of the LTE-A. The average total efficiency of the first antenna in the high frequency mode is about -3 dB.

FIG. 8 is a graph of S parameters (scattering parameters) when the antenna structure 100 operates in the LTE-A low frequency mode. Obviously, when the first switching unit 401 in the first switching circuit 40 switches to a different switching element 402 (for example, four different switching elements 402, the inductance value of each switching element 402 When it is 5nH, 10nH, 30nH, 90nH), since each switching element 402 has a different impedance, the low frequency band of the first antenna can be effectively adjusted by the switching of the first switching unit 401. Wherein, the curve S21 is an S parameter (scattering parameter) graph when the first antenna in the antenna structure 100 operates in the LTE-A low frequency mode when the inductance value is 5 nH. The curve S22 is an S parameter (scattering parameter) graph when the first antenna operates in the LTE-A low frequency mode when the inductance value is 10 nH. The curve S23 is an S parameter (scattering parameter) graph when the first antenna operates in the LTE-A low frequency mode when the inductance value is 30 nH. The curve S24 is an S parameter (scattering parameter) graph when the first antenna operates in the LTE-A low frequency mode when the inductance value is 90 nH.

FIG. 9 is a graph showing the total radiation efficiency of the antenna structure 100 when operating in the LTE-A low frequency mode. The curve S211 is a radiation efficiency diagram when the first antenna (main antenna) in the antenna structure 100 operates in the LTE-A low frequency mode when the inductance value is 5 nH. The curve S212 is a radiation efficiency diagram when the first antenna in the antenna structure 100 operates in the LTE-A low frequency mode when the inductance value is 10 nH. The curve S213 is a radiation efficiency diagram when the first antenna in the antenna structure 100 operates in the LTE-A low frequency mode when the inductance value is 30 nH. The curve S214 is a radiation efficiency diagram when the first antenna in the antenna structure 100 operates in the LTE-A low frequency mode when the inductance value is 90 nH. The curve S311 is a total radiation efficiency diagram when the first antenna in the antenna structure 100 operates in the LTE-A low frequency mode when the inductance value is 5nH. The curve S312 is a total radiation efficiency diagram when the first antenna operates in the LTE-A low frequency mode when the inductance value is 10 nH. The curve S313 is a total radiation efficiency diagram when the first antenna operates in the LTE-A low frequency mode when the inductance value is 30 nH. The curve S314 is a total radiation efficiency diagram when the first antenna operates in the LTE-A low frequency mode when the inductance value is 90 nH. The average total efficiency of the first antenna in the low frequency mode is about -5.2~6dB.

FIG. 10 is a graph of S parameters (scattering parameters) when the second antenna (diversity antenna) in the antenna structure 100 operates in the LTE-A low-mid-high frequency mode and the GPS mode. Obviously, when the first switching unit 401 in the first switching circuit 40 switches to different switching elements 402 (for example, four different switching elements 402, the inductance values of each switching element 402 are 20nH, 35nH, 60nH, respectively). , 100nH) At the same time, since each switching element 402 has a different impedance, the low frequency band of the second antenna can be effectively adjusted by the switching of the first switching unit 401. Wherein, when the curves S411, S412, S413, and S414 are switched to the switching elements 402 having inductance values of 20nH, 35nH, 60nH, and 100nH, respectively, the second antenna in the antenna structure 100 operates in the LTE-A low-mid frequency mode. S-parameter (scattering parameter) graph for state and GPS mode.

11 is a graph showing the total radiation efficiency when the second antenna (diversity antenna) in the antenna structure 100 operates in the LTE-A low-mid-high frequency mode and the GPS mode. Wherein, when the curves S611, S612, S613, and S614 are respectively switched to the switching elements 402 having the inductance values of 20nH, 35nH, 60nH, and 100nH, the second antenna in the antenna structure 100 operates in the LTE-A medium-frequency mode. Radiation efficiency map with GPS mode. The curves S711, S712, S713, and S714 are respectively switched to the switching elements 402 having inductance values of 20nH, 35nH, 60nH, and 100nH, and the second antenna operates when the LTE-A is in the high-frequency mode and the GPS mode. Radiation efficiency map. The curves S811, S812, S813, and S814 are radiation efficiency maps when the second antenna operates in the LTE-A low-frequency mode when switching to the switching element 402 having inductance values of 20nH, 35nH, 60nH, and 100nH, respectively. The curves S911, S912, S913, and S914 are total radiation efficiency maps when the second antenna operates in the LTE-A low frequency mode when switching to the switching element 402 having inductance values of 20nH, 35nH, 60nH, and 100nH, respectively. The average total efficiency of the second antenna LTE-A low-frequency mode is about -4.5~5.5dB. The average total efficiency of the second antenna LTE-A high frequency mode is about -3.4 dB. The average total efficiency of the second antenna in the GPS mode is about -1 dB.

In another embodiment, as shown in FIG. 12, the antenna structure 100 further includes a third feed point F3 for forming a third antenna 200. The third antenna 200 may be a loop antenna, a PIFA antenna, a slot antenna, or a hybrid antenna including a plurality of types of antenna structures. The third antenna 200 has a length of about 35 mm.

FIG. 13 is a graph of S parameters (scattering parameters) when the antenna structure 100 operates in the high frequency mode of the LTE-A. Wherein the curve S31 is the first antenna (main antenna) in the antenna structure 100. The S value when used in the LTE-A high frequency mode. The curve S32 is an S value when the first antenna (main antenna) in the antenna structure 100 operates in the LTE-A intermediate frequency mode. The curve S33 is an S value when the second antenna (diversity antenna) in the antenna structure 100 operates in the high frequency mode in the LTE-A.

As described in the foregoing embodiments, the antenna structure 100 defines the notched annular metal frame 20 to divide the first radiating portion H1 and the second radiating portion H2 from the annular metal frame 20. The first radiating portion H1 can excite the first mode and the second mode to generate a radiation signal of the LTE-A low, medium, and high frequency bands. The second radiating portion H2 can excite the third mode and the fourth mode to generate a radiation signal of the LTE-A low, medium, and high frequency bands. Therefore, the wireless communication device can use the Carrier Aggregation (CA) technology of LTE-A and simultaneously receive or transmit wireless signals in a plurality of different frequency bands to increase transmission using the first radiating portion H1 or the second radiating portion H2. Bandwidth, which implements 3CA.

In summary, the creation meets the requirements of the invention patent, and the patent application is filed according to law. However, the above description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited to the above embodiments, and those skilled in the art will be equivalently modified or changed according to the spirit of the present invention. It should be covered by the following patent application.

Claims (8)

An antenna structure includes an annular metal frame, a first feeding source, and a second feeding source, wherein the annular metal frame is provided with a notch portion, a first radiating portion and a second radiating portion. The first feed source is electrically connected to the first radiating portion to feed a current signal to the first radiating portion, thereby causing the first radiating portion to simultaneously excite the first mode and the second mode to generate a radiation signal of the first frequency band and the second frequency band; the second feed source is electrically connected to the second radiation portion to feed a current signal to the second radiation portion, thereby causing the second radiation portion to simultaneously excite Generating a third mode and a fourth mode to generate a radiation signal of the third frequency band and the fourth frequency band; the frequency of the second frequency band is higher than the frequency of the first frequency band, and the frequency of the fourth frequency band is higher than a frequency of the third frequency band; the antenna structure further includes a first ground portion, a second ground portion, a third ground portion, and a fourth ground portion electrically connected between the annular metal frame and the ground plane, The annular metal frame passes through the first ground portion, the second ground portion, and the The grounding portion and the fourth grounding portion are divided into the first radiating portion, the second radiating portion, and the partition portion, and the partition portion is located between the first radiating portion and the second radiating portion; The antenna structure further includes a matching component, one end of the matching component being electrically connected to the third grounding portion and the other end being grounded for matching the impedance of the second radiating portion. The antenna structure of claim 1, wherein the matching component is a capacitor, an inductor or a resistor. The antenna structure of claim 1, wherein: in the annular metal frame, a portion of the first feed source to the first ground portion forms a first branch, the first feed a portion of the source to the second ground portion forming a second branch, the first branch for exciting the first mode, the second branch for exciting the second mode; the ring metal a portion of the second feed source to the third ground portion forming a third branch, and a portion of the second feed source to the fourth ground portion forming a fourth branch, the third branch Used to stimulate the said a third mode, the fourth branch is for exciting the fourth mode; the notch is located between the first ground portion and the fourth ground portion, and the isolation portion is located at the second Between the ground portion and the third ground portion. The antenna structure of claim 3, wherein the antenna structure further comprises a fifth grounding portion and a first switching circuit, the first switching circuit comprising a first adjustable inductance, the first adjustable One end of the inductor is electrically connected to the first branch through the fifth grounding portion, and the other end of the first adjustable inductor is grounded, and the first one is adjusted by adjusting an inductance value of the first adjustable inductor Frequency band. The antenna structure of claim 3, wherein: the antenna structure further includes a sixth grounding portion and a second switching circuit, the second switching circuit includes a second adjustable inductor, and the second adjustable One end of the inductor is electrically connected to the third branch through the sixth grounding portion, and the other end of the second adjustable inductor is grounded, and the third value is adjusted by adjusting an inductance value of the second adjustable inductor Frequency band. The antenna structure of claim 5, wherein the notch portion is made of a non-conductive material. A wireless communication device comprising a motherboard and an antenna structure according to any one of claims 1-6. The wireless communication device according to claim 7, wherein a gap between the annular metal frame and the motherboard is 2 mm.