TWI678022B - Antenna structure and wireless communication device with same - Google Patents

Abstract

An antenna structure includes a casing and at least one switching circuit. The casing includes a frame. The frame is made of a metal material. The frame is provided with at least one breakpoint, and at least two are divided from the frame. Radiating sections, the switching circuit is provided corresponding to the breakpoint, and both ends of the switching circuit are respectively electrically connected to the radiating sections on both sides of the breakpoint, and by controlling the at least one switching circuit to be in an open circuit state or In a short-circuit state, the length of the radiating portion is adjusted, and then the bandwidth of the antenna structure is adjusted.

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, electronic devices such as mobile phones and personal digital assistants have continued to develop toward diversified functions, thinner and lighter, and faster and more efficient data transmission. However, the space that can accommodate the antenna is getting smaller and smaller, and with the continuous development of wireless communication technology, the bandwidth requirement of the antenna is increasing. Therefore, how to design an antenna with a wide bandwidth in a limited space is an important issue for antenna design.

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 casing and at least one switching circuit. The casing includes a frame. The frame is made of a metal material. The frame is provided with at least one breakpoint, and further extends from the frame. At least two radiating sections are divided, and the switching circuit is set corresponding to the breakpoint, and both ends of the switching circuit are electrically connected to the radiating sections on both sides of the breakpoint, respectively, by controlling the at least one switching circuit It is in an open circuit state or a short circuit state to adjust the length of the radiating part, and then adjust the bandwidth of the antenna structure.

A wireless communication device includes the antenna structure described above.

The antenna structure and the wireless communication device having the antenna structure are provided with the casing, and the breakpoint on the casing is used to divide the antenna structure from the casing, so that a broadband design can be effectively implemented.

100, 100a‧‧‧ Antenna Structure

11‧‧‧shell

110‧‧‧system ground plane

111‧‧‧ border

112‧‧‧medium frame

113‧‧‧ back plate

114‧‧‧headroom

115, 115a‧‧‧End

116‧‧‧First side

117‧‧‧ second side

118‧‧‧Slotted

119‧‧‧First breakpoint

120‧‧‧ Second breakpoint

121‧‧‧ Third breakpoint

F1‧‧‧First Radiation Department

F2, F2a‧‧‧Second Radiation Department

F3‧‧‧The third radiation department

F4‧‧‧Fourth Radiation Department

E1, E2‧‧‧ endpoint

12‧‧‧First Feeding Department

16a‧‧‧Second Feeding Department

17a‧‧‧Third Feeding Department

18a‧‧‧ Ground

13, 15‧‧‧ switching circuit

13a‧‧‧Single switch

a1, b1, c1, d1‧‧‧ moving contact

a2‧‧‧Static contact

13b, 13c‧‧‧Dual switch

b2, c2, d2‧‧‧ the first static contact

b3, c3, d3‧‧‧ second static contact

131, 133‧‧‧ matching components

13d‧‧‧Multi-way switch

d4‧‧‧third static contact

d5‧‧‧ Fourth static contact

200, 200a‧‧‧ wireless communication device

201‧‧‧display unit

21, 21a‧‧‧First electronic component

23, 23a‧‧‧Second electronic component

25, 25a‧‧‧Third electronic component

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

FIG. 2 is an internal diagram of the wireless communication device shown in FIG. 1.

3 is a schematic cross-sectional view taken along a line III-III in the wireless communication device shown in FIG. 1.

4 is a schematic cross-sectional view taken along the line IV-IV in the wireless communication device shown in FIG. 1.

FIG. 5 is an internal diagram of the antenna structure shown in FIG. 1.

6A to 6C are schematic diagrams of current flows during the operation of the antenna structure shown in FIG. 5.

7A to 7D are circuit diagrams of a switching circuit in the antenna structure shown in FIG. 5.

FIG. 8 is a graph of S parameters (scattering parameters) of the antenna structure shown in FIG. 1.

FIG. 9 is a graph of the total radiation efficiency of the antenna structure shown in FIG. 1.

FIG. 10 is a schematic diagram of an antenna structure applied to a wireless communication device according to a second preferred embodiment of the present invention.

FIG. 11 is an internal schematic diagram of the wireless communication device shown in FIG. 10.

FIG. 12 is an internal diagram of the antenna structure shown in FIG. 10.

13A to 13C are schematic diagrams of current flows during the operation of the antenna structure shown in FIG. 12.

FIG. 14 is a graph of S parameters (scattering parameters) of the antenna structure shown in FIG. 10.

FIG. 15 is a graph of the total radiation efficiency of the antenna structure shown in FIG. 10.

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 part of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those with ordinary knowledge in the art without any creative labor belong to the protection scope of the present invention.

It should be noted that when an 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 method, or a non-contact connection method, for example, a non-contact coupling method.

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. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to limit the invention.

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

Please refer to FIG. 1, FIG. 2, FIG. 3 and FIG. 4. The first preferred embodiment of the present invention provides an antenna structure 100 that can be applied to a wireless communication device 200 such as a mobile phone or a personal digital assistant to transmit and receive. Radio waves are used to transmit and exchange wireless signals. FIG. 1 is a schematic diagram of an antenna structure 100 applied to a wireless communication device 200. FIG. 2 is a schematic diagram of the wireless communication device 200. FIG. 3 is a schematic cross-sectional view taken along the line III-III in the wireless communication device 200 shown in FIG. 1. Figure 4 FIG. 1 is a schematic cross-sectional view taken along the line IV-IV in the wireless communication device 200 shown in FIG. 1.

The antenna structure 100 includes a casing 11, a first feeding portion 12 (see FIG. 5), and at least one switching circuit. The casing 11 includes at least a system ground plane 110, a frame 111, a middle frame 112, and a back plate 113. The system ground plane 110 may be made of metal or other conductive materials to provide ground for the antenna structure 100.

The frame 111 is substantially a ring structure, and is made of metal or other conductive materials. The frame 111 is disposed on the periphery of the system ground plane 110, that is, it is disposed around the system ground plane 110. In this embodiment, an edge of one side of the frame 111 is spaced from the system ground plane 110, and a corresponding headroom region 114 is formed between the two (see FIGS. 3 and 4). It can be understood that, in this embodiment, the distance between the frame 111 and the system ground plane 110 can be adjusted according to requirements. For example, the distance between the frame 111 and the system ground plane 110 at different positions may be equidistant or unequal.

The middle frame 112 is substantially a rectangular sheet, and is made of metal or other conductive materials. The shape and size of the middle frame 112 are slightly smaller than the system ground plane 110. The middle frame 112 is stacked on the system ground plane 110.

In this embodiment, an opening (not shown in the figure) is provided on one side of the frame 111 near the middle frame 112 for receiving the display unit 201 of the wireless communication device 200. The display unit 201 has a display plane, and the display plane is exposed through the opening.

The back plate 113 is made of metal or other conductive materials. The back plate 113 is disposed on an edge of the frame 111. In this embodiment, the back plate 113 is disposed on one side of the system ground plane 110 facing away from the middle frame 112, and is disposed substantially parallel to the display plane of the display unit 201 and the middle frame 112. .

In this embodiment, the system ground plane 110, the frame 111, the middle frame 112, and the back plate 113 may form an integrally formed metal frame. The middle frame 112 is a metal sheet located between the display unit 201 and the system ground plane 110. The middle frame 112 is used to support the display unit 201, provide electromagnetic shielding, and improve the mechanical strength of the wireless communication device 200.

In this embodiment, the frame 111 includes at least an end portion 115, a first side portion 116, and a second side portion 117. The end portion 115 is a bottom end of the wireless communication device 200. The first side portion 116 and the second side portion 117 are disposed opposite to each other, and the two are disposed at both ends of the end portion 115 respectively, and are preferably disposed vertically.

The casing 11 is further provided with a slot 118 and at least one breakpoint. The slot 118 is formed on the back plate 113. The slot 118 is substantially U-shaped, and is formed on one side of the back plate 113 near the end portion 115 and extends in a direction where the first side portion 116 and the second side portion 117 are located, respectively. In this embodiment, the housing 11 is provided with two breakpoints, namely a first breakpoint 119 and a second breakpoint 120. The first breakpoint 119 and the second breakpoint 120 are both located on the frame 111. Specifically, the first breakpoint 119 and the second breakpoint 120 are both opened at the end portion 115. The first breakpoint 119 and the second breakpoint 120 are disposed at intervals, both of which penetrate and block the frame 111, and communicate with the slot 118.

The slot 118 and the at least one breakpoint jointly define at least two radiating portions from the casing 11. In this embodiment, the slot 118, the first breakpoint 119, and the second breakpoint 120 collectively divide three radiating portions from the casing 11, namely a first radiating portion F1 and a second radiating portion. F2 and the third radiation portion F3. In this embodiment, the frame 111 between the first breakpoint 119 and the second breakpoint 120 forms the first radiating portion F1. The edge between the first breakpoint 119 and the slot 118 located between the endpoints E1 of the first side portion 116 The frame 111 forms the second radiating portion F2. The frame 111 between the second break point 120 and the slot 118 located between the end points E2 of the second side portion 117 forms the third radiating portion F3. In this embodiment, the first radiating portion F1 is spaced from the middle frame 112 and is insulated. The side of the second radiating portion F2 near one of the endpoints E1 and the side of the third radiating portion F3 near one of the endpoints E2 are both connected to the system ground plane 110 and the back plate 113, that is, Ground.

It can be understood that, in this embodiment, the width of the slot 118 is less than or equal to twice the width of the first break point 119 and the second break point 120. The width of the slot 118 is 0.5-2 mm. The width of the first breakpoint 119 and the second breakpoint 120 are both 1-2 mm.

It can be understood that, in this embodiment, the slot 118, the first break point 119, and the second break point 120 are all filled with an insulating material (such as plastic, rubber, glass, wood, ceramic, etc., but not the same) Is limited).

Please refer to FIG. 5 together. The wireless communication device 200 further includes at least one electronic component. In this embodiment, the wireless communication device 200 includes at least three electronic components, namely a first electronic component 21, a second electronic component 23, and a third electronic component 25. The first electronic component 21 is a universal serial bus (Universal Serial Bus, USB) interface module. The first electronic component 21 is disposed on an edge of the middle frame 112 adjacent to the first radiating portion F1 and is insulated from the first radiating portion F1 through the slot 118. The second electronic component 23 is a speaker. The second electronic component 23 is disposed on one side of the middle frame 112 adjacent to the first radiating portion F1 and is disposed corresponding to the second break point 120. In this embodiment, the distance between the second electronic component 23 and the slot 118 is approximately 2-10 mm. The third electronic component 25 is a microphone, which is disposed on an edge of the middle frame 112 adjacent to the first radiation portion F1. All The third electronic component 25 is disposed on a side of the first electronic component 21 away from the second electronic component 23 and is disposed adjacent to the first break point 119. In this embodiment, the second electronic component 23 and the third electronic component 25 are also insulated from the first radiation portion F1 through the slot 118.

It can be understood that, in other embodiments, the positions of the second electronic component 23 and the third electronic component 25 can be adjusted according to specific requirements, for example, the positions of the two are interchanged.

In this embodiment, the first feed-in portion 12 is disposed in a headroom region 114 between the system ground plane 110 and the frame 111. One end of the first feeding portion 12 can be electrically connected to a signal feeding point (not shown in the figure) on the system ground plane 110 by means of a spring, a microstrip line, a strip line, a coaxial cable, and the like, A matching circuit (not shown) is electrically connected to one side of the first radiating portion F1 near the second break point 120 for feeding a current signal to the first radiating portion F1 and the second radiating portion. F2 and the third radiation section F3.

In this embodiment, the first feeding portion 12 may be made of iron, metal copper foil, or a conductor in a laser direct structuring (LDS) process.

In this embodiment, the antenna structure 100 includes two switching circuits, that is, switching circuits 13 and 15. The switching circuit 13 is set corresponding to the second breakpoint 120. One end of the switching circuit 13 is electrically connected to the first radiating portion F1, and the other end is electrically connected to the third radiating portion F3. The switching circuit 15 is set corresponding to the first breakpoint 119. One end of the switching circuit 15 is electrically connected to the first radiating portion F1, and the other end is electrically connected to the second radiating portion F2.

In this embodiment, by controlling the switching circuit 13 and the switching circuit 15 to be in an open circuit state or a short circuit state, the radiating portion of the antenna structure 100 (such as the first The length of one radiating portion F1, the second radiating portion F2, and / or the third radiating portion F3) is to adjust the frequency bandwidth of the antenna structure 100 to achieve the function of multi-frequency adjustment.

For example, please refer to FIG. 6A together, which is a current path diagram of the antenna structure 100 when the switching circuits 13 and 15 are both in an open circuit state. At this time, the first radiation portion F1 is disconnected from the second radiation portion F2, and the first radiation portion F1 is disconnected from the third radiation portion F3. After the first feeding portion 12 feeds a current, the current flows through the first radiating portion F1 and flows to the first break point 119 (see path P1). In this way, the first radiating portion F1 constitutes a monopole antenna, and then a first working mode is excited to generate a radiation signal in a first radiation frequency band. When the first feeding portion 12 feeds a current, the current is coupled from the first radiating portion F1 to the second radiating portion F2 (see path P2). In this way, the second radiating portion F2 constitutes a loop antenna, and then a second working mode is excited to generate a radiation signal in a second radiation frequency band. After the first feeding portion 12 feeds a current, the current is coupled from the first radiating portion F1 to the third radiating portion F3 (see path P3). In this way, the third radiating portion F3 constitutes a loop antenna, and then a third working mode is excited to generate a radiation signal in a third radiation frequency band.

In this embodiment, the first working mode is a Long Term Evolution Advanced (LTE-A) low-frequency mode, and the second working mode is an LTE-A high-frequency mode. The third working mode is an LTE-A intermediate frequency mode. The frequency of the first radiation band is 700-960 MHz. The frequency of the second radiation band is 2300-2690MHz. The frequency of the third radiation band is 1710-2170 MHz.

Please refer to FIG. 6B together, for the current path diagram of the antenna structure 100 when the switching circuit 13 is in an open circuit state and the switching circuit 15 is in a short circuit state. At this time, all The first radiating portion F1 is electrically connected to the second radiating portion F2, and the first radiating portion F1 is disconnected from the third radiating portion F3. After the first feeding portion 12 feeds a current, the current flows through the first radiating portion F1 and the second radiating portion F2 (see path P4), and then a fourth working mode is excited to generate fourth radiation. Radiation signal in the frequency band. After the first feeding portion 12 feeds current, the current will flow through the first radiating portion F1 and the second radiating portion F2, then into the system ground plane 110 and the middle frame 112, and then into the The third radiating portion F3 (see path P5) further excites a fifth working mode to generate a radiation signal in a fifth radiating frequency band.

In this embodiment, the fourth working mode is an ultra intermediate frequency mode, and the fifth working mode is an ultra high frequency mode. The frequency of the fourth radiation band is 1447.9-1510.9MHz. The frequency of the fifth radiation band is 3400-3800MHz.

Please refer to FIG. 6C together, for the current path diagram of the antenna structure 100 when the switching circuit 13 is in a short circuit state and the switching circuit 15 is in an open circuit state. At this time, the first radiation portion F1 is disconnected from the second radiation portion F2, and the first radiation portion F1 is electrically connected to the third radiation portion F3. When the first feeding part 12 feeds current, the current will be coupled from the first radiating part F1 to the second radiating part F2, and then flow into the system ground plane 110 and the middle frame 112 (see path P6). And further excite the second working mode to generate a radiation signal in a second radiation frequency band. When the first feeding portion 12 feeds a current, the current will flow through the first radiating portion F1 and the third radiating portion F3, and then into the system ground plane 110 and the middle frame 112 (see path P7). To further excite the first working mode to generate a radiation signal in a first radiation frequency band.

It can be understood that the specific structure of the switching circuits 13 and 15 may be in various forms, for example, it may include a single switch, a dual switch, a dual switch with a matching element, a multiple switch with a matching element, and the like. In this embodiment, only one of the switching circuits, for example, the switching circuit 13 is taken as an example. The structure of the switching circuits 13 and 15 will be described.

Please refer to FIG. 7A together. In one embodiment, the switching circuit 13 includes a single switch 13a. The one-way switch 13a includes a moving contact a1 and a static contact a2. The moving contact a1 is electrically connected to the first radiating portion F1. The static contact a2 of the one-way switch 13a is electrically connected to the third radiating portion F3. In this way, by controlling the one-way switch 13a to be turned on or off, the switching circuit 13 can be controlled to be in an open state or a short-circuit state, thereby making the first radiation portion F1 and the third radiation portion F3 electrically connected or disconnected Open the connection to achieve the function of multi-frequency adjustment.

It can be understood that please refer to FIG. 7B together. In one embodiment, the switching circuit 13 includes a dual switch 13b. The two-way switch 13b includes a moving contact b1, a first static contact b2, and a second static contact b3. The moving contact b1 is electrically connected to the first radiating portion F1. The first stationary contact b2 is electrically connected to the third radiating portion F3. The second static contact b3 is electrically connected to the system ground plane 110.

By controlling the switching of the moving contact b1, the moving contact b1 can be switched to the first static contact b2 and the second static contact b3, respectively. As such, the first radiating portion F1 is electrically connected to the third radiating portion F3 or is electrically connected to the system ground plane 110. When the first radiating portion F1 is electrically connected to the third radiating portion F3, it corresponds to the short circuit state of the switching circuit 13. When the first radiating portion F1 is electrically connected to the system ground plane 110, it corresponds to the switching circuit 13 being in an open circuit state. That is, by controlling the switching of the moving contact b1, the switching circuit 13 can be controlled to be in an open or short circuit state, so that the first radiating portion F1 and the third radiating portion F3 are electrically connected or Disconnect (corresponds to the first radiating part F1 being electrically connected to the system ground plane 110), thereby achieving the function of multi-frequency adjustment.

Understandably, please refer to FIG. 7C together. In one embodiment, the switching The circuit 13 includes a two-way switch 13 c and a matching element 131. The two-way switch 13c includes a moving contact c1, a first static contact c2, and a second static contact c3. The moving contact c1 is electrically connected to the first radiating portion F1. The first stationary contact c2 is electrically connected to the third radiating portion F3. The second static contact c3 is electrically connected to the system ground plane 110 through the matching element 131. The matching element 131 has a predetermined impedance. The matching element 131 may include an inductor, a capacitor, or a combination of an inductor and a capacitor.

By controlling the switching of the moving contact c1, the moving contact c1 can be switched to the first static contact c2 and the second static contact c3, respectively. As such, the first radiating portion F1 is electrically connected to the third radiating portion F3 or is electrically connected to the system ground plane 110. When the first radiating portion F1 is electrically connected to the third radiating portion F3, it corresponds to the short circuit state of the switching circuit 13. When the first radiating portion F1 is electrically connected to the system ground plane 110 through the matching element 131, the switching circuit 13 is in an open state. That is, by controlling the switching of the movable contact c1, the switching circuit 13 can be controlled to be in an open state or a short circuit state, so that the first radiation portion F1 and the third radiation portion F3 are electrically connected or Disconnect (corresponds to the first radiating part F1 being electrically connected to the system ground plane 110), thereby achieving the function of multi-frequency adjustment.

Please refer to FIG. 7D together. In one embodiment, the switching circuit 13 includes a multiplexer 13d and at least one matching element 133. In this embodiment, the multi-channel switch 13 d is a four-channel switch, and the switching circuit 13 includes three matching elements 133. The multiplexer 13d includes a moving contact d1, a first static contact d2, a second static contact d3, a third static contact d4, and a fourth static contact d5. The moving contact d1 is electrically connected to the first radiating portion F1. The first stationary contact d2 is electrically connected to the third radiating portion F3. The second static contact d3 and the third static contact d4 The fourth static contact d5 is electrically connected to the system ground plane 110 through the corresponding matching element 133, respectively. Each of the matching elements 133 has a preset impedance, and the preset impedances of the matching elements 133 may be the same or different. Each matching element 133 may include an inductor, a capacitor, or a combination of an inductor and a capacitor. The position of each matching element 133 electrically connected to the system ground plane 110 may be the same or different.

By controlling the switching of the moving contact d1, the moving contact d1 can be switched to the first static contact d2, the second static contact d3, the third static contact d4, and the fourth static contact, respectively. Point d5. As such, the first radiating portion F1 is electrically connected to the third radiating portion F3 or is electrically connected to the system ground plane 110 through different matching elements 133. When the first radiating portion F1 is electrically connected to the third radiating portion F3, it corresponds to the short circuit state of the switching circuit 13. When the first radiating portion F1 is electrically connected to the system ground plane 110 through different matching elements 133, the switching circuit 13 is in an open state. That is, by controlling the switching of the movable contact d1, the switching circuit 13 can be controlled to be in an open state or a short circuit state, so that the first radiating portion F1 and the third radiating portion F3 are electrically connected or Disconnect (corresponds to the first radiating part F1 being electrically connected to the system ground plane 110), thereby achieving the function of multi-frequency adjustment.

It can be understood that, in this embodiment, the frame 111 and the system ground plane 110 are also electrically connected through connection methods such as a spring, a solder, and a probe. The position of the electrical connection point between the frame 111 and the system ground plane 110 can be adjusted according to the frequency of the required low frequency. For example, if the electrical connection point between the two is close to the first feeding portion 12, the low-frequency frequency of the antenna structure 100 is shifted toward the high-frequency. When the electrical connection point between the two is kept away from the first feeding portion 12, the low frequency frequency of the antenna structure 100 is shifted to a low frequency.

FIG. 8 is a graph of S parameters (scattering parameters) of the antenna structure 100. The curve S81 is the S11 value of the antenna structure 100 when the switching circuits 13 and 15 are both in an open circuit state. The curve S82 is the S11 value of the antenna structure 100 when the switching circuit 13 is in an open circuit state and the switching circuit 15 is in a short circuit state. The curve S83 is the S11 value of the antenna structure 100 when the switching circuit 13 is in a short circuit state and the switching circuit 15 is in an open circuit state.

FIG. 9 is a graph of the total radiation efficiency of the antenna structure 100. The curve S91 is the total radiation efficiency of the antenna structure 100 when the switching circuits 13 and 15 are both in an open circuit state. The curve S92 is the total radiation efficiency of the antenna structure 100 when the switching circuit 13 is in an open circuit state and the switching circuit 15 is in a short circuit state. The curve S93 is the total radiation efficiency of the antenna structure 100 when the switching circuit 13 is in a short circuit state and the switching circuit 15 is in an open circuit state.

Obviously, it can be seen from FIG. 8 and FIG. 9 that when the switching circuits 13 and 15 are in an open circuit state, the antenna structure 100 can cover the corresponding LTE-A low, middle and high frequency bands. When the switching circuit 13 is in a short-circuited state and the switching circuit 15 is in an open-circuited state, the antenna structure 100 is electrically connected to the first radiating portion F1 and the third radiating portion F3 through the switching circuit 13, thereby realizing The extension of the radiator enables the antenna structure 100 to excite corresponding low-frequency and high-frequency bands. When the switching circuit 13 is in an open circuit state and the switching circuit 15 is in a short circuit state, the antenna structure 100 is electrically connected to the first radiating portion F1 and the second radiating portion F2 through the switching circuit 15, thereby realizing The extension of the radiator enables the antenna structure 100 to further cover ultra-medium frequency and ultra-high frequency bands.

That is, the antenna structure 100 is cut by the switching circuits 13 and 15. Changing, can produce a variety of different working modes, such as low, medium, high, ultra intermediate frequency and ultra high frequency modes, covering the world's commonly used communication frequency bands. Specifically, the antenna structure 100 can cover GSM850 / 900 / WCDMA Band5 / Band8 at low frequencies, GSM 1800/1900 / WCDMA 2100 (1710-2170MHz) at intermediate frequencies, and LTE-A Band7, Band40, Band41 at high frequencies. (2300-2690MHz), UHF covers 1447.9-1510.9MHz, UHF covers 3400-3800MHz. The designed frequency band of the antenna structure 100 can be applied to the operation of the GSM Qual-band, UMTS Band I / II / V / VIII frequency bands and the LTE 850/900/1800/1900/2100/2300/2500 frequency bands commonly used in the world.

In summary, the antenna structure 100 of the present invention is provided with at least one breakpoint (for example, a first breakpoint 119 and a second breakpoint 120) on the frame 111, and corresponding switching circuits 13, 15 are provided. In this way, different switching modes can be used to cover multiple frequency bands such as low frequency, intermediate frequency, high frequency, ultra intermediate frequency and ultra high frequency. By providing the switching circuits 13 and 15, radiation can be connected between different radiation portions (for example, the first radiation portion F1, the second radiation portion F2, and the third radiation portion F3), so that the radiation of the antenna structure 100 Compared with the ordinary metal back cover antenna, it has more broadband effect. The antenna structure 100 can improve the low-frequency bandwidth and have better antenna efficiency. In addition, it can also increase the frequency bands for ultra-medium frequency and ultra-high frequency, covering the requirements of global frequency band applications and supporting carrier aggregation applications (Carrier Aggregation, CA).

Example 2

Please refer to FIG. 10, FIG. 11 and FIG. 12, which is an antenna structure 100 a provided by the second preferred embodiment of the present invention. Radio waves are used to transmit and exchange wireless signals. FIG. 10 is a schematic diagram of an antenna structure 100a applied to a wireless communication device 200a. FIG. 11 is a wireless communication device 200a The internal diagram. FIG. 12 is a schematic diagram of the antenna structure 100a.

The antenna structure 100 a includes a casing 11, a first feeding portion 12, and at least one switching circuit. The casing 11 includes at least a system ground plane 110, a frame 111, a middle frame 112, and a back plate 113. The frame 111 includes an end portion 115 a, a first side portion 116, and a second side portion 117. The casing 11 is provided with a slot 118 and at least one breakpoint. The wireless communication device 200a includes a first electronic component 21a, a second electronic component 23a, and a third electronic component 25a.

It can be understood that, in this embodiment, the difference between the antenna structure 100a and the antenna structure 100 in Embodiment 1 is that the end portion 115a is not the bottom of the wireless communication device 200a, but the wireless communication device 200a. On top. That is, the antenna structure 100a constitutes an upper antenna instead of a lower antenna of the wireless communication device 200a.

It can be understood that, in this embodiment, the antenna structure 100a is different from the antenna structure 100 in Embodiment 1 in that the number of breakpoints on the casing 11 is three, not two. That is, in addition to the first breakpoint 119 and the second breakpoint 120, a third breakpoint 121 is also provided on the casing 11. The third break point 121 is set on the frame 111. Specifically, the third breakpoint 121 is opened on the first side portion 116 and is disposed adjacent to the first breakpoint 119. The third break point 121 penetrates and blocks the frame 111 and communicates with the slot 118.

As such, in this embodiment, the slot 118, the first breakpoint 119, the second breakpoint 120, and the third breakpoint 121 collectively divide four radiating portions from the casing 11, namely, The first radiation portion F1, the second radiation portion F2a, the third radiation portion F3, and the fourth radiation portion F4. Wherein, the frame 111 between the first breakpoint 119 and the second breakpoint 120 forms the first radiation portion F1. The frame 111 between the first breakpoint 119 and the third breakpoint 121 forms the second radiation portion F2a. The second breakpoint 120 and the slot 118 are located in the second The frame 111 between the end points E2 of the side portions 117 forms the third radiating portion F3. The frame 111 between the third breakpoint 121 and the slot 118 located between the end points E1 of the first side portion 116 forms the fourth radiation portion F4.

It can be understood that, in this embodiment, the antenna structure 100a differs from the antenna structure 100 in Embodiment 1 in that the types and positions of the first electronic component 21a, the second electronic component 23a, and the third electronic component 25a are the same as The types and positions of the first electronic component 21, the second electronic component 23, and the third electronic component 25 in the antenna structure 100 in Embodiment 1 are different. The first electronic component 21a is a proximity sensor. The first electronic component 21a is disposed on an edge of the middle frame 112 adjacent to the first radiating portion F1, and is disposed substantially corresponding to a middle position of the first radiating portion F1. The second electronic component 23a is a front lens module. The second electronic component 23a is disposed on the middle frame 112 on the side of the first electronic component 21a facing away from the first radiation portion F1. The third electronic component 25a is a receiver, which is disposed on an edge of the middle frame 112 adjacent to the first radiation portion F1. The third electronic component 25 a is disposed between the first electronic component 21 a and the first break point 119.

In this embodiment, the first electronic component 21a, the second electronic component 23a, and the third electronic component 25a are all insulated from the first radiation portion F1 through the slot 118. The distance between the first electronic component 21a and the slot 118 is 2-10 mm. The distance between the third electronic component 25a and the slot 118 is 2-10 mm.

In this embodiment, one end of the first feeding portion 12 may be electrically connected to a signal feeding point on the system ground plane 110 by means of a spring sheet, a microstrip line, a strip line, a coaxial cable, etc. (Shown), the other end is electrically connected to one side of the first radiating portion F1 near the second break point 120 through a matching circuit (not shown) for feeding a current signal to the first radiating portion F1.

It can be understood that, in this embodiment, the antenna structure 100a is different from the antenna structure 100 in Embodiment 1 in that the antenna structure 100a further includes a second feeding portion 16a, a third feeding portion 17a, and a ground portion 18a. One end of the second feeding portion 16a may be electrically connected to a signal feeding point on the system ground plane 110 by means of a spring, a microstrip line, a strip line, a coaxial cable, and the like, and the other end may be connected by a matching circuit ( (Not shown) is electrically connected to one side of the second radiating portion F2a near the first breakpoint 119 for feeding a current signal to the second radiating portion F2a. One end of the third feed-in portion 17a may be electrically connected to a signal feed-in point on the system ground plane 110 by means of an elastic sheet, a microstrip line, a strip line, a coaxial cable, and the like, and the other end may be connected by a matching circuit ( (Not shown) is electrically connected to one side of the fourth radiating portion F4 near the third break point 121 for feeding a current signal to the fourth radiating portion F4. One end of the ground portion 18a is electrically connected to one side of the second radiating portion F2a near the third break point 121, and the other end may be electrically connected to the system ground plane 110 for the second radiating portion. F2a provides ground.

It can be understood that, in this embodiment, the antenna structure 100a is different from the antenna structure 100 in Embodiment 1 in that the number of switching circuits in the antenna structure 100a is one, not two. That is, the antenna structure 100 a includes only one switching circuit, such as the switching circuit 13. The switching circuit 13 is set corresponding to the second breakpoint 120. One end of the switching circuit 13 is electrically connected to the first radiating portion F1, and the other end is electrically connected to the third radiating portion F3. Of course, in other embodiments, the switching circuit 13 is not limited to being set corresponding to the second breakpoint 120, and may also be set corresponding to the first breakpoint 119 or the third breakpoint 121, and further used To connect different radiation parts. The specific structure of the switching circuit 13 may be in various forms, such as any one of FIG. 7A to FIG. 7D.

Please refer to FIG. 13A together, which is a current path diagram of the antenna structure 100a when the switching circuit 13 is in an open circuit state. At this time, the first radiation portion F1 and the third radiation portion F3 are disconnected. After the first feeding portion 12 feeds a current, the current flows through the first radiating portion F1 and flows to the first break point 119 (see path P1a). In this way, the first radiating portion F1 constitutes a monopole antenna, and then a first working mode is excited to generate a radiation signal in a first radiation frequency band. When the first feeding portion 12 feeds a current, the current is coupled from the first radiating portion F1 to the second radiating portion F2a, and is grounded through the grounding portion 18a (see path P2a). In this way, the second radiating portion F2a constitutes a loop antenna, and further excites a second working mode to generate a radiation signal in a second radiation frequency band. When the first feeding portion 12 feeds a current, the current is coupled from the first radiating portion F1 to the third radiating portion F3 (see path P3a). In this way, the third radiating portion F3 constitutes a loop antenna, and then a third working mode is excited to generate a radiation signal in a third radiation frequency band.

After the first feeding portion 12 feeds a current, the current is coupled from the first radiating portion F1 to the second radiating portion F2a, and flows to the third break point 121 (see path P4a), and further excites The fourth working mode generates a radiation signal in a fourth radiation band. After the first feeding portion 12 feeds a current, the current is coupled from the first radiating portion F1 to the third radiating portion F3, and then flows into the system ground plane 110 and the middle frame 112 (see path P5a). Then, a fifth working mode is excited to generate a radiation signal in a fifth radiation frequency band.

In this embodiment, the first working mode is an LTE-A low-frequency mode, and the second working mode is an LTE-A high-frequency mode. The third working mode is an LTE-A intermediate frequency mode. The fourth working mode is an ultra intermediate frequency mode, and the fifth working mode is an ultra high frequency mode. The frequency of the first radiation band is 700-960 MHz. The frequency of the second radiation band is 2300-2690MHz. The frequency of the third radiation band is 1710-2170 MHz. The frequency of the fourth radiation band is 1447.9-1510.9MHz. The frequency of the fifth radiation band is 3400-3800MHz.

Please refer to FIG. 13B together, which is a current path diagram of the antenna structure 100a when the switching circuit 13 is in a short-circuit state. At this time, the first radiation portion F1 and the third radiation portion F3 are electrically connected. After the first feeding portion 12 feeds a current, the current flows through the first radiating portion F1 and the third radiating portion F3, and then flows into the system ground plane 110 and the middle frame 112 (see path P6a). The first working mode is further excited to generate a radiation signal in the first radiation frequency band. After the first feeding portion 12 feeds current, the current is coupled from the first radiating portion F1 to the second radiating portion F2a, then flows into the system ground plane 110 and the middle frame 112, and then flows into the The third radiating portion F3 (refer to path P7a) is further excited to generate the fifth working mode to generate a radiating signal in a fifth radiating frequency band.

Please refer to FIG. 13C together, which is a current path diagram of the antenna structure 100a when the switching circuit 13 is in an open or short circuit state. Wherein, when the second feeding portion 16a feeds a current, the current flows through the second radiating portion F2a (see path P8), and then a sixth working mode is excited to generate a radiation signal in a sixth radiating frequency band. . When the third feeding portion 17a feeds a current, the current flows through the fourth radiating portion F4, and then flows into the system ground plane 110 and the middle frame 112 (see path P9), thereby inspiring a seventh job. Mode to generate a radiation signal in the seventh radiation band.

In this embodiment, the sixth working mode includes a Global Positioning System (GPS) mode and a WIFI 2.4GHz mode. The seventh working mode includes a WIFI 5GHz mode and a UHF mode. The frequency of the sixth radiation band includes 1575MHz and 2400-2480MHz. The frequency of the seventh radiation band includes 5150-5850MHz and 3400-3800MHz.

FIG. 14 is a graph of S parameters (scattering parameters) of the antenna structure 100a. The curve S141 is the S11 value of the LTE-A low, medium, high, ultra intermediate frequency, and ultra high frequency modes corresponding to the first feeding section 12 when the switching circuit 13 is in an open circuit state. The curve S142 is the S11 value of the GPS mode and the WIFI 2.4GHz mode corresponding to the second feeding portion 16a when the switching circuit 13 is in an open circuit state. The curve S143 is the S11 value of the WIFI 5GHz mode and the UHF mode corresponding to the third feeding portion 17a when the switching circuit 13 is in an open circuit state. The curve S144 is the S11 value of the LTE-A low, middle, high, ultra intermediate frequency, and ultra high frequency modes corresponding to the first feeding section 12 when the switching circuit 13 is in a short circuit state. The curve S145 is the S11 value of the GPS mode and WIFI 2.4GHz mode corresponding to the second feeding portion 16a when the switching circuit 13 is in a short-circuit state. The curve S146 is the S11 value of the WIFI 5GHz mode and the UHF mode corresponding to the third feeding portion 17a when the switching circuit 13 is in a short circuit state.

FIG. 15 is a graph of the total radiation efficiency of the antenna structure 100a. The curve S151 is the total radiation efficiency of the LTE-A low, medium, high, ultra intermediate frequency and ultra high frequency modes corresponding to the first feeding section 12 when the switching circuit 13 is in an open circuit state. The curve S152 is the total radiation efficiency of the GPS mode and the WIFI 2.4GHz mode corresponding to the second feeding portion 16a when the switching circuit 13 is in an open circuit state. The curve S153 is the total radiation efficiency of the WIFI 5GHz mode and the UHF mode corresponding to the third feeding portion 17a when the switching circuit 13 is in an open circuit state. The curve S154 is the total radiation efficiency of the LTE-A low, middle, high, ultra intermediate frequency, and ultra high frequency modes corresponding to the first feeding section 12 when the switching circuit 13 is in a short-circuit state. The curve S155 is the GPS mode and WIFI corresponding to the second feeding portion 16a when the switching circuit 13 is in a short-circuit state. The total radiation efficiency of the 2.4GHz mode. The curve S156 is the total radiation efficiency of the WIFI 5GHz mode and the UHF mode corresponding to the third feeding portion 17a when the switching circuit 13 is in a short-circuit state.

Obviously, as can be seen from FIG. 14 and FIG. 15, when the switching circuit 13 is in an open circuit state, the antenna structure 100 a may cover corresponding low frequency band, intermediate frequency band, high frequency band, ultra intermediate frequency band, ultra high Frequency band, GPS frequency band, WIFI 2.4GHz frequency band and WIFI 5GHz frequency band. When the switching circuit 13 is in a short-circuited state, the antenna structure 100a is electrically connected to the first radiating portion F1 and the third radiating portion F3 through the switching circuit 13 to further extend the radiator, so that the antenna The structure 100a can excite better low frequency characteristics and ultra high frequency modes, and also covers the corresponding intermediate frequency band, high frequency band, ultra intermediate frequency band, GPS frequency band, WIFI 2.4GHz frequency band and WIFI 5GHz frequency band.

That is to say, the antenna structure 100a can generate various working modes by switching the switching circuit 13, including low frequency mode, intermediate frequency mode, high frequency mode, ultra intermediate frequency mode, and ultra high frequency mode. , GPS mode, WIFI 2.4GHz mode and WIFI 5GHz mode, covering communication frequency bands commonly used in the world. Specifically, the antenna structure 100a can cover GSM850 / 900 / WCDMA Band5 / Band8 at low frequencies, GSM 1800/1900 / WCDMA 2100 (1710-2170MHz) at intermediate frequencies, and LTE-A Band7, Band40, Band41 at high frequencies. (2300-2690MHz), UHF covers 1447.9-1510.9MHz, UHF covers 3400-3800MHz. Can also cover GPS frequency band, Wi-Fi 2.4GHz frequency band and Wi-Fi 5GHz frequency band. The design frequency band of the antenna structure 100a can be applied to the operation of the GSM Qual-band, UMTS Band I / II / V / VIII frequency bands and the LTE 850/900/1800/1900/2100/2300/2500 frequency bands commonly used worldwide.

In summary, the antenna structure 100a of the present invention is provided with at least one breakpoint (such as a first breakpoint 119, a second breakpoint 120, and a third breakpoint 121) on the frame 111, and a corresponding switching circuit 13 is provided. In this way, different switching methods can be used to cover multiple frequency bands such as low frequency, intermediate frequency, high frequency, ultra intermediate frequency, ultra high frequency, GPS, Wi-Fi 2.4GHz and Wi-Fi 5GHz. By providing the switching circuit 13, it can be connected between different radiating portions (such as the first radiating portion F1 and the third radiating portion F3), so that the antenna structure 100 a is more effective than a general metal back antenna. Broadband effect. The antenna structure 100a can improve the low-frequency bandwidth and have better antenna efficiency. In addition, the antenna structure 100a can also increase the frequency band of ultra-medium frequency and ultra-high frequency, covering global frequency band applications and requirements for supporting carrier aggregation (CA) applications.

It can be understood that the antenna structure 100 of the first preferred embodiment of the present invention and the antenna structure 100a of the second preferred embodiment of the present invention can be applied to the same wireless communication device. For example, the antenna structure 100 is disposed at the lower end of the wireless communication device as a main antenna, and the antenna structure 100a is disposed at the upper end of the wireless communication device as a secondary antenna. When the wireless communication device sends a wireless signal, the wireless communication device uses the main antenna to send a wireless signal. When the wireless communication device receives a wireless signal, the wireless communication device uses the primary antenna and the secondary antenna to receive a wireless signal together.

The invention proposes an antenna structure design of a wireless communication device applied to a high-screen-occupancy screen (a frontal area of a wireless communication device with a screen area greater than 70%), and a metal frame surrounding the wireless communication device is used as a radiation portion. The radiating part of the metal frame and the system ground plane form a parallel plate capacitor, and a monopole antenna is used to feed the current. The radiating part of the metal frame is integrated with the overall appearance of the wireless communication device.

The above descriptions are merely preferred embodiments of the present invention, and are not intended to be any responsibility for the present invention. What form is limited. 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.

Claims (17)

An antenna structure is improved in that the antenna structure includes a housing, at least one switching circuit, and a first feeding portion, the housing includes a frame and a back plate, and the frame and the back plate are made of a metal material. The frame is arranged around the edge of the back plate. The frame is provided with at least one break point, and the back plate is provided with a slot. The slot and the at least break point are divided from the frame together. At least two radiating portions, the first feeding portion is electrically connected to one of the radiating portions to feed current to the at least two radiating portions, the switching circuit is set corresponding to the breakpoint, and The two ends are respectively electrically connected to the radiating portions on both sides of the breakpoint, and the length of the radiating portion is adjusted by controlling the at least one switching circuit to be in an open state or a short circuit state, thereby adjusting the bandwidth of the antenna structure. . The antenna structure according to item 1 of the scope of the patent application, wherein the antenna structure includes two switching circuits, two breakpoints are provided on the frame, and both of the breakpoints are provided on the frame and partition. The frame, the slot and two of the breakpoints collectively divide three radiating portions from the frame, each switching circuit is set corresponding to a breakpoint, and both ends are electrically connected to the breakpoint two Radiation on the side. The antenna structure according to item 2 of the scope of patent application, wherein the frame includes at least an end portion, a first side portion, and a second side portion, and the first side portion and the second side portion are respectively connected to the ends. At both ends of the portion, the slot is opened on one side of the back plate near the end portion, and extends in the direction of the first side portion and the second side portion, respectively. The two breakpoints include the first A breakpoint and a second breakpoint, the first breakpoint and the second breakpoint are spaced apart from each other at the end portion, and the frame between the first breakpoint and the second breakpoint is formed A first radiating portion, the frame between the first breakpoint and the slot located at an end point of the first side portion forming a second radiating portion, the second breakpoint and the slot being located The frame between the endpoints of the second side portion forms a third radiating portion, and a switching circuit is provided corresponding to the first breakpoint, and both ends are electrically connected to the first radiating portion and the A second radiating part, and another switching circuit is provided corresponding to the second breakpoint, and both ends are respectively electrically connected to the first radiating part And the third radiating portion. The antenna structure according to item 3 of the scope of patent application, wherein the antenna structure further includes a system ground plane, and the first feeding portion is electrically connected to the first radiating portion to feed a current to the first radiating portion. The second radiating section and the third radiating section; when both of the switching circuits are in an open state and the first feeding section feeds current, the current flows through the first radiating section and flows to all The first breakpoint is further excited to generate a first working mode to generate a radiation signal in a first radiation band, and the current is further coupled from the first radiation portion to the second radiation portion, thereby exciting a second operation. A mode to generate a radiation signal in a second radiation band, and the current is further coupled from the first radiation section to the third radiation section, thereby exciting a third working mode to generate a radiation signal in a third radiation band; When the switching circuit corresponding to the second breakpoint is in an open state and the switching circuit corresponding to the first breakpoint is in a short-circuited state, and the first feeding section is fed with a current, the current flows through the first Radiation section and second radiation section And further excite a fourth working mode to generate a radiation signal in a fourth radiation band, the current also flows through the first and second radiation sections, then flows into the system ground plane, and then flows into the third The radiating part further excites a fifth working mode to generate a radiation signal in a fifth radiating frequency band; when the switching circuit corresponding to the second breakpoint is in a short-circuit state and the switching circuit corresponding to the first breakpoint is in an open circuit state, And when the first feeding part feeds current, the current is coupled from the first radiating part to the second radiating part, and then flows into the system ground plane, thereby exciting the second working mode to generate The radiation signal of the second radiation frequency band, the current also flows through the first radiation part and the third radiation part, and then flows into the system ground plane, thereby exciting the first working mode to generate radiation in the first radiation frequency band. Signal. The antenna structure according to item 4 of the scope of patent application, wherein the frequency of the first radiation frequency band is lower than the frequency of the fourth radiation frequency band, and the frequency of the fourth radiation frequency band is lower than that of the third radiation frequency band. Frequency, the frequency of the third radiation band is lower than the frequency of the second radiation band, and the frequency of the second radiation band is lower than the frequency of the fifth radiation band. The antenna structure according to item 1 of the scope of patent application, wherein the antenna structure includes a switching circuit, and three breakpoints are provided on the frame, and the three breakpoints are provided on the frame and cut off the frame. The slot and three of the breakpoints collectively divide four radiating portions from the frame, the switching circuit is set corresponding to one of the breakpoints, and both ends are electrically connected to two sides of the breakpoint respectively. Radiation department. The antenna structure according to item 6 of the patent application scope, wherein the frame includes at least an end portion, a first side portion, and a second side portion, and the first side portion and the second side portion are respectively connected to the ends At both ends of the portion, the slot is opened on one side of the back plate close to the end portion and extends in the direction of the first side portion and the second side portion, respectively. The three breakpoints include the first A breakpoint, a second breakpoint, and a third breakpoint, the first breakpoint and the second breakpoint are opened at the end portion, and the third breakpoint is opened at the first side portion, The frame between the first breakpoint and the second breakpoint constitutes a first radiating portion, and the frame between the first breakpoint and the third breakpoint constitutes a second radiating portion, The frame between the second breakpoint and the slot located at an end point of the second side portion constitutes a third radiating portion, and the third breakpoint and the slot are located on the first side The frame between the end points of the portion constitutes a fourth radiating portion, the switching circuit is provided corresponding to the second breakpoint, and both ends are electrically connected to the first radiating portion, respectively. A radiation part and the third radiation part. The antenna structure according to item 7 of the scope of patent application, wherein the antenna structure further includes a second feeding portion, a third feeding portion, a grounding portion, and a system ground plane, and the first feeding portion is electrically connected to the first feeding portion A radiating part to feed current to the first, second, and third radiating parts, and the second feeding part is electrically connected to the second radiating part to feed current to the second A radiating portion, the third feeding portion is electrically connected to the fourth radiating portion to feed a current to the fourth radiating portion, and the ground portion is electrically connected to the second radiating portion as the second radiating portion; The radiating section provides ground; when the switching circuit is in an open circuit state and the first feeding section feeds current, the current flows through the first radiating section and flows to the first breakpoint, thereby exciting a first A working mode to generate a radiation signal in a first radiation frequency band, the current is also coupled from the first radiation section to the second radiation section, and is grounded through the ground section, thereby exciting a second working mode State to generate a radiation signal in a second radiation frequency band, said electrical The current is also coupled from the first radiating section to the third radiating section, thereby exciting a third working mode to generate a radiation signal in a third radiating frequency band, and the current also flows through the first radiating section and the second radiating section. The radiating part flows to the third breakpoint, and then a fourth working mode is excited to generate a radiation signal in the fourth radiating frequency band. The current also flows through the first radiating part and the third radiating part, and then flows into the radiating part. The system ground plane further excites a fifth working mode to generate a radiation signal in a fifth radiation frequency band; when the switching circuit is in a short-circuit state and the first feed-in portion feeds current, the current flows through the The first radiating part and the third radiating part flow into the system ground plane, and then the first working mode is excited to generate a radiation signal in the first radiating frequency band, and the current also flows from the first radiating part. Coupled to the second radiating section, then flowing into the system ground plane, and then into the third radiating section, thereby exciting the fifth working mode to generate a radiation signal in a fifth radiation frequency band; when the second Feed Department Feed When a current flows, the current flows through the second radiating portion, and then a sixth working mode is excited to generate a radiation signal in a sixth radiating frequency band. When the third feeding portion feeds current, the current flows through The fourth radiating part flows into the ground plane of the system, and then a seventh working mode is excited to generate a radiation signal in a seventh radiation frequency band. The antenna structure according to item 8 of the scope of patent application, wherein the frequency of the first radiation frequency band is lower than the frequency of the fourth radiation frequency band, and the frequency of the fourth radiation frequency band is lower than that of the third radiation frequency band. Frequency, the frequency of the third radiation band is lower than the frequency of the second radiation band, the frequency of the second radiation band is lower than the frequency of the fifth radiation band, and a part of the frequency of the sixth radiation band is located at Between the frequency of the fourth radiation band and the frequency of the third radiation band, another part of the frequency of the sixth radiation band overlaps with the frequency of the second radiation band, and the frequency of the seventh radiation band is high At or equal to the frequency of the fifth radiation band. The antenna structure according to item 7 of the patent application scope, wherein the antenna structure further includes a system ground plane, the switching circuit includes a switch, and the switch includes a moving contact, a first static contact, and a second static contact The moving contact is electrically connected to the first radiating part, the first static contact is electrically connected to the third radiating part, and the second static contact is electrically connected to the system ground plane. According to the antenna structure of claim 10, wherein the second static contact is electrically connected to the system ground plane through a first matching element, the first matching element has a preset impedance. The antenna structure according to item 11 of the scope of patent application, wherein the switch further includes a third static contact, and the third static contact is electrically connected to the system ground plane through a second matching element. The two matching elements have a predetermined impedance, and the first matching element and the second matching element are electrically connected to different positions of the system ground plane. The antenna structure according to item 1 of the patent application scope, wherein the antenna structure further includes a system ground plane and a middle frame, and the system ground plane is made of a metal material to provide ground for the antenna structure, and the frame It is arranged on the periphery of the system ground plane. The middle frame is made of metal material and is stacked on the system ground plane. The backplane is set on the system ground plane and faces one of the middle frames. Side, the system ground plane, frame and back plate are integrated. The antenna structure according to item 1 of the scope of patent application, wherein the antenna structure further includes a system ground plane, and the first feed-in portion is disposed in a clearance area between the system ground plane and the frame. The antenna structure according to item 1 of the patent application scope, wherein the antenna structure further includes a system ground plane, the frame is arranged around the system ground plane, and the frame is at the same distance from the system ground plane at different positions . The antenna structure according to item 1 of the patent application scope, wherein the antenna structure further includes a system ground plane, the frame is arranged around the system ground plane, and the frame is at a different distance from the system ground plane at different positions. the same. A wireless communication device includes the antenna structure according to any one of claims 1-16 of the scope of patent application.