CN112151936A

CN112151936A - Antenna structure and wireless communication device with same

Info

Publication number: CN112151936A
Application number: CN201910578433.8A
Authority: CN
Inventors: 宋昆霖; 李义杰; 陈永亲
Original assignee: Shenzhen Futaihong Precision Industry Co Ltd; Chiun Mai Communication Systems Inc
Current assignee: Shenzhen Futaihong Precision Industry Co Ltd; Chiun Mai Communication Systems Inc
Priority date: 2019-06-28
Filing date: 2019-06-28
Publication date: 2020-12-29

Abstract

The invention provides an antenna structure, which comprises a metal frame, a first feed-in part, a second feed-in part, a first grounding part and a second grounding part, wherein a first breakpoint and a second breakpoint are arranged on the metal frame; the first feed-in part is electrically connected with the first radiation part so as to feed in current signals to the first radiation part, and the second feed-in part is electrically connected with the second radiation part so as to feed in current signals to the second radiation part. The invention also provides a wireless communication device with the antenna structure. The antenna structure and the wireless communication device with the same can cover LTE-A low, medium and high frequency bands, GPS frequency bands, WIFI2.4GHz and WIFI5GHz frequency bands, and the frequency range is wide.

Description

Antenna structure and wireless communication device with same

Technical Field

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

Background

With the progress of wireless communication technology, electronic devices such as mobile phones and personal digital assistants are gradually developing towards the trend of function diversification, light weight, and faster and more efficient data transmission. However, the space for accommodating the antenna is smaller and smaller, and the bandwidth requirement of the antenna is increasing with the development of wireless communication technology. Therefore, how to design an antenna with a wider bandwidth in a limited space is an important issue for antenna design.

Disclosure of Invention

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

An embodiment of the present invention provides an antenna structure applied to a wireless communication device, where the antenna structure includes a metal casing, a first feed-in portion, a second feed-in portion, a first ground portion, and a second ground portion, where the metal casing includes at least a metal back plate and a metal frame, the metal frame and the metal back plate are integrally formed, the metal frame is provided with a first breakpoint, a second breakpoint, a first radiation portion, and a second radiation portion, the metal back plate is provided with a slot and at least one extension section, the slot is provided at a planar edge of the metal back plate and is parallel to the metal frame, and the at least one extension section is vertically connected to one end of the slot and is parallel to a terminal portion of the metal frame; one of the first break point and the second break point is arranged at one end of the slot and connected with the extension section; the first breakpoint and the second breakpoint are both through and cut off the metal frame, the metal frame between the first breakpoint and the second breakpoint forms the first radiation part, the first grounding part and the second grounding part are both electrically connected with the first radiation part, and the metal frame of the second breakpoint far away from the first radiation part forms the second radiation part; the first feed-in part is electrically connected with the first radiation part so as to feed in current signals to the first radiation part, and the second feed-in part is electrically connected with the second radiation part so as to feed in current signals to the second radiation part.

An embodiment of the present invention provides a wireless communication device, which includes the antenna structure.

The antenna structure and the wireless communication device with the same can cover LTE-A low-frequency band, LTE-A intermediate-frequency band, LTE-A high-frequency band, GPS frequency band, WIFI2.4GHz and WIFI5GHz frequency band, and the frequency range is wider.

Drawings

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

Fig. 2 is an assembly diagram of the wireless communication device shown in fig. 1.

Fig. 3 is a circuit diagram of the antenna structure shown in fig. 1.

Fig. 4 is a schematic diagram of a current flow direction of the antenna structure shown in fig. 3 during operation.

Fig. 5 is a circuit diagram of a switching circuit in the antenna structure shown in fig. 3.

Fig. 6 is a graph of S-parameters (scattering parameters) of the antenna structure shown in fig. 1 operating in the LTE-a low-frequency mode.

Fig. 7 is a radiation efficiency graph of the antenna structure shown in fig. 1 operating in the LTE-a low frequency mode.

Fig. 8 is a graph of S-parameters (scattering parameters) of the antenna structure shown in fig. 1 operating in the LTE-a intermediate frequency mode and the LTE-a high frequency mode.

Fig. 9 is a radiation efficiency diagram of the antenna structure shown in fig. 1 operating in LTE-a medium-frequency mode and high-frequency mode.

Fig. 10 is a graph illustrating S parameters (scattering parameters) of the antenna structure shown in fig. 1 operating in a GPS mode and a WIFI2.4GHz mode.

Fig. 11 is a radiation efficiency diagram of the antenna structure shown in fig. 1 operating in a GPS mode and a WIFI2.4GHz mode.

Fig. 12 is a graph illustrating S-parameters (scattering parameters) of the antenna structure shown in fig. 1 operating in the WIFI5GHz mode.

Fig. 13 is a radiation efficiency graph of the antenna structure shown in fig. 1 operating in the WIFI5GHz mode.

Fig. 14 is a diagram illustrating an antenna structure applied to a wireless communication device according to a second preferred embodiment of the present invention.

Fig. 15 is a schematic diagram of an antenna structure according to a third preferred embodiment of the present invention.

Fig. 16 is a schematic diagram of the current flow of the antenna structure shown in fig. 15 during operation.

Fig. 17 is a graph of S-parameters (scattering parameters) of the antenna structure shown in fig. 15 operating in the LTE-a low frequency mode.

Fig. 18 is a radiation efficiency graph of the antenna structure shown in fig. 15 operating in the LTE-a low frequency mode.

Fig. 19 is a graph of S-parameters (scattering parameters) of the antenna structure shown in fig. 15 operating in the LTE-a intermediate frequency mode and the LTE-a high frequency mode.

Fig. 20 is a radiation efficiency diagram of the antenna structure shown in fig. 15 operating in LTE-a medium-frequency mode and high-frequency mode.

Fig. 21 is a graph illustrating S parameters (scattering parameters) of the antenna structure shown in fig. 15 operating in the GPS mode and the WIFI2.4GHz mode.

Fig. 22 is a radiation efficiency chart of the antenna structure shown in fig. 15 operating in the GPS mode and the WIFI2.4GHz mode.

Fig. 23 is a graph illustrating S-parameters (scattering parameters) of the antenna structure shown in fig. 15 operating in the WIFI5GHz mode.

Fig. 24 is a radiation efficiency graph of the antenna structure shown in fig. 15 operating in the WIFI5GHz mode.

Description of the main elements

Antenna structures

100, 100a

Wireless communication device

200, 200a, 200b

Housing 11

First ground point 210

Second ground point 211

A first feed-in point 212

A second feed-in point 213

A third feed-in point 214

First electronic component 215

Second electronic component 216

Third electronic component 217

Fourth electronic component 218

First feeding part 12

Second feeding part 13

Third feeding parts

14, 14a

First ground part 15

Second ground portion 16

First matching circuit 17

Switching

circuits

18, 18a

Switching unit 181

Switching element 183

Frame 112

Back plate 113

Display unit 201

Accommodation space 114

Tip part 115

First side 116

Second side 117

First breakpoints

118, 118b

Second break points

119, 119b

Open slot 120

First radiation portion E1

Second radiation portion E2

First extension 121

Second extension 122

Second matching circuit 131

Third matching circuit 141

Fourth matching circuits

151, 151a

Antenna radiation paths A1, A1a

Radiator

20, 20a

Connecting part 21

First elongate section 22

Second extension 23

The following detailed description will further illustrate the invention in conjunction with the above-described figures.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It will be understood that when an element is referred to as being "electrically connected" to another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "electrically connected" to another component, it can be connected by contact, e.g., by wires, or by contactless connection, e.g., by contactless coupling.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

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

Example 1

Referring to fig. 1 and 2, a first preferred embodiment of the present invention provides an antenna structure 100, which can be applied to a wireless communication device 200, such as a mobile phone, a personal digital assistant, etc., for transmitting and receiving radio waves to transmit and exchange wireless signals.

Referring to fig. 3, the antenna structure 100 at least includes a housing 11, a first feeding portion 12, a second feeding portion 13, a third feeding portion 14, a first grounding portion 15, a second grounding portion 16, a first matching circuit 17, a switching circuit 18, and a radiator 20.

The housing 11 may be an outer shell of the wireless communication device 200. The housing 11 includes at least a bezel 112 and a back plate 113. The frame 112 and the back plate 113 are made of metal material. In the present embodiment, the frame 112 is substantially annular and is disposed on the periphery of the back plate 113. The frame 112 and the back plate 113 are integrally formed. An opening (not shown) is disposed on a side of the frame 112 away from the back plate 113 for accommodating the display unit 201 of the wireless communication device 200. It is understood that the display unit 201 has a display plane exposed at the opening.

The back plate 113 is disposed parallel to the display plane of the display unit 201 at an interval. It can be understood that, in the present embodiment, the back plate 113 and the frame 112 together form an accommodating space 114. The accommodating space 114 is used for accommodating electronic components or circuit modules such as a substrate and a processing unit of the wireless communication device 200 therein. It is understood that, in the present embodiment, the display unit 201 may be a full screen structure. In other embodiments, the display unit 201 may have a non-full screen structure, that is, the display unit 201 may have at least one notch (not shown).

It is understood that, in the present embodiment, the frame 112 at least includes a terminal portion 115, a first side portion 116 and a second side portion 117. In this embodiment, the terminal portion 115 may be a top end of the wireless communication device 200, i.e., the antenna structure 100 constitutes an upper antenna of the wireless communication device 200. The first side portion 116 and the second side portion 117 are disposed opposite to each other, and are disposed at both ends of the terminal portion 115, preferably, perpendicularly.

In the present embodiment, the frame 112 is provided with a first breakpoint 118 and a second breakpoint 119. The back plate 113 is provided with a slot 120. In this embodiment, the first breaking point 118 is disposed at a position of the first side portion 116 close to the end portion 115, and the first breaking point 118 is disposed at an end of the slot 120. The second break point 119 is opened at a position of the end portion 115 close to the second side portion 117. The slot 120 is disposed at the edge of the back plate 113 and parallel to the frame 112. The slot 120 is substantially an inverted U-shaped structure, and is opened inside the end portion 115 and extends toward the first side portion 116 and the second side portion 117, so that the end portion 115 and the back plate 113 are spaced apart and insulated from each other.

In this embodiment, the first breaking point 118 and the second breaking point 119 are both connected to the slot 120 and extend to block the frame 112. In the present embodiment, the slot 120, the first break point 118 and the second break point 119 jointly define a first radiation portion E1 and a second radiation portion E2 spaced apart from the frame 112. In the present embodiment, the border 112 between the first break point 118 and the second break point 119 constitutes the first radiation portion E1. The bezel 112 of the second break point 119 on the side away from the first radiation portion E1 and the first break point 118 constitutes the second radiation portion E2.

In the present embodiment, the first radiating portion E1 and the back plate 113 are spaced and insulated from each other by the slot 120 and the first break 118. The side of the second radiating portion E2 away from the second break point 119 is connected to the bezel 112, so that the second radiating portion E2, the bezel 112 and the backplate 113 form an integrally formed frame.

In the present embodiment, the widths of the first breakpoint 118 and the second breakpoint 119 are both D1. The slot 120 has a width D2. In the present embodiment, the width D1 of the first breakpoint 118 and the second breakpoint 119 is 1-3 mm. The width D2 of the slot 120 is 0.5-1.5 mm. The first radiating part E1 and the second radiating part E2 are at least 1mm away from the metal element in the accommodating space 114. The first and second radiation sections E1 and E2 are at least 1mm away from a metal element in the display unit 201.

It is understood that, in the present embodiment, the first breaking point 118, the second breaking point 119 and the slot 120 are filled with an insulating material, such as plastic, rubber, glass, wood, ceramic, etc., but not limited thereto.

It is understood that in other embodiments, the shape of the slot 120 is not limited to the U shape described above, and may be adjusted according to specific requirements, for example, it may also be straight, oblique, zigzag, and so on.

Obviously, the shape and position of the slot 120 and the positions of the first break point 118 and the second break point 119 on the frame 112 can be adjusted according to specific requirements, and it is only necessary to ensure that the slot 120, the first break point 118 and the second break point 119 can jointly divide the first radiation portion E1 and the second radiation portion E2 from the housing 11 at intervals.

In this embodiment, the antenna structure 100 further includes a first grounding point 210, a second grounding point 211, a first feeding point 212, a second feeding point 213 and a third feeding point 214. The first grounding point 210 and the second grounding point 211 are spaced apart to provide grounding for the antenna structure 100. The first feeding point 212 is disposed between the first grounding point 210 and the second grounding point 211 for feeding current to the antenna structure 100. The second feeding point 213 and the third feeding point 214 are disposed on a side of the second grounding point 211 away from the first grounding point 210 for feeding current to the antenna structure 100.

It is understood that the wireless communication device 200 further comprises at least one electronic component. In the present embodiment, the wireless communication device 200 includes at least four electronic components, namely a first electronic component 215, a second electronic component 216, a third electronic component 217, and a fourth electronic component 218. The first electronic element 215, the second electronic element 216, the third electronic element 217, and the fourth electronic element 218 are disposed in the accommodating space 114 and are located between the first feeding point 212 and the third feeding point 214.

In this embodiment, the first electronic component 215 is an audio interface module, which is disposed between the second grounding point 211 and the third feeding point 214, and is disposed close to the third feeding point 214. The second electronic component 216 is a front camera module, and is located between the first feeding point 212 and the second grounding point 211. The third electronic component 217 is a receiver module, which is located between the second grounding point 211 and the second electronic component 216 and is disposed close to the second electronic component 216. The fourth electronic component 218 is an earphone module, and is disposed between the first feeding point 212 and the second electronic component 216.

It is understood that the second disconnection point 119 corresponds to the first electronic component 215, such that the first electronic component 215 is partially exposed from the second disconnection point 119. In this way, a user can insert an audio component (e.g., a headset) through the second disconnection point 119, and thus establish an electrical connection with the first electronic component 215. The first electronic element 215, the second electronic element 216, the third electronic element 217 and the fourth electronic element 218 are all arranged in a spaced-apart and insulated manner from the first radiation portion E1 through the slot 120.

In this embodiment, the antenna structure 100 further includes a first extension segment 121 and a second extension segment 122. The first extension 121 and the second extension 122 are disposed in the housing 11. The first extension segment 121, the second extension segment 122 and the slot 120 are all slot holes opened in the back plate 113. The first extension segment 121 is substantially straight. One end of the first extension segment 121 is vertically connected to one end of the slot 120 and the first break point 118. The other end of the first extension segment 121 extends in a direction parallel to the distal end portion 115 and close to the second side portion 117. The second extension 122 is substantially straight. One end of the second extension 122 is vertically connected to the other end of the slot 120. The other end of the second extension 122 extends in a direction parallel to the distal end portion 115 and close to the first side portion 116. In this embodiment, the extension sections of the first extension section 121 and the second extension section 122 are on the same straight line.

The first extension 121 has a length L1. The second extension 122 has a length L2. In the present embodiment, the length L1 of the first extension segment 121 and the length L2 of the second extension segment 122 are both 1mm-20mm, and the length L1 of the first extension segment 121 is different from the length L2 of the second extension segment 122. In the present embodiment, the L1 is greater than L2, i.e., the length L1 of the first extension segment 121 is longer than the length L2 of the second extension segment 122.

It is understood that in other embodiments, the shapes of the first extending section 121 and the second extending section 122 are not limited to the straight strip shape, and may be adjusted according to specific requirements, for example, they may also be in a diagonal shape, a zigzag shape, and the like. The positions and lengths of the first extension 121 and the second extension 122 can also be adjusted according to specific requirements. For example, the positions of the first extension 121 and the second extension 122 may be interchanged. The length L1 of the first extension 121 is shorter than the length L2 of the second extension 122. The length L1 of the first extension 121 is the same as the length L2 of the second extension 122.

The first feeding part 12 is disposed inside the housing 11. The first feeding portion 12 is located between the fourth electronic element 218 and the first grounding portion 15, and is disposed close to the fourth electronic element 218. One end of the first feeding element 12 is electrically connected to the first radiating element E1, and the other end is electrically connected to the first feeding point 212 through the first matching circuit 17, so as to feed a current signal into the first radiating element E1.

It is understood that, in the present embodiment, the first matching circuit 17 may be an L-type matching circuit, a T-type matching circuit, a pi-type matching circuit, or other combinations of capacitors, inductors, and capacitors and inductors for adjusting the impedance matching of the first radiation portion E1.

The second feeding portion 13 is disposed inside the housing 11 and located between the third feeding portion 14 and the second side portion 117. One end of the second feeding element 13 is electrically connected to the second radiation element E2, and the other end is electrically connected to the second feeding point 213 through a second matching circuit 131, so as to feed a current signal to the second radiation element E2.

It is understood that, in the present embodiment, the second matching circuit 131 may be an L-type matching circuit, a T-type matching circuit, a pi-type matching circuit, or other combinations of capacitors, inductors, and capacitors and inductors for adjusting the impedance matching of the second radiation portion E2.

In this embodiment, the radiator 20 is disposed in the accommodating space 114, spaced apart from the second radiation portion E2, and disposed adjacent to the second break point 119. The radiator 20 is a zigzag sheet, which may be a Flexible Printed Circuit (FPC) or formed by a Laser Direct Structuring (LDS) process. The radiator 20 includes a connection portion 21, a first extension 22, and a second extension 23. The connecting portion 21 is substantially straight, and the connecting portion 21 is electrically connected to the third feeding portion 14 and extends in a direction parallel to the first side portion 116 and close to the terminal portion 115. The first extension segment 22 is in a straight strip shape. The first extension segment 22 is vertically connected to one end of the connecting portion 21 away from the third feeding portion 14, and extends in a direction away from the back plate 113. The second extension section 23 is in a straight strip shape. The second extension 23 is perpendicularly connected to an end of the first extension 22 away from the connecting portion 21 and extends in a direction parallel to the end portion 115 and close to the second side portion 117.

In this embodiment, the first elongate section 22 and the second elongate section 23 are both located in the same plane. The connecting portion 21 and the first extension 22 are located on different planes. The connecting portion 21 and the first extension 22 together form an L-shaped structure. The first extension 22 and the second extension 23 together form another L-shaped structure. The first extension 22 vertically connects the connecting portion 21 and the second extension 23, so that the front view of the radiator 20 is substantially an L-shaped structure (see fig. 3).

It is understood that the shape and structure of the radiator 20 can be adjusted according to specific requirements. That is, the shapes of the connecting portion 21, the first extension segment 22 and the second extension segment 23 are not limited to the straight strip shape, and can be adjusted according to specific requirements, such as an L-shaped structure, a U-shaped structure, and the like.

In this embodiment, the third feeding element 14 is disposed inside the housing 11 and located between the second feeding element 13 and the first electronic element 215. One end of the third feeding element 14 is electrically connected to the connecting portion 21 of the radiator 20, and the other end of the third feeding element is electrically connected to the third feeding point 214 through a third matching circuit 141, so as to feed a current signal to the connecting portion 21, the first extension segment 22, and the second extension segment 23, wherein the current signal is coupled from the radiator 20 to the second radiating portion E2.

It is understood that, in the present embodiment, the third matching circuit 141 may be an L-type matching circuit, a T-type matching circuit, a pi-type matching circuit, or other combinations of capacitors, inductors, and capacitors and inductors, so as to adjust the impedance matching between the radiator 20 and the second radiation portion E2.

In the present embodiment, the first grounding portion 15 is disposed inside the housing 11 and located between the first breaking point 118 and the first feeding portion 12. One end of the first grounding portion 15 is electrically connected to the first grounding point 210 through a fourth matching circuit 151, and the other end is electrically connected to the end of the first radiation portion E1 close to the first breakpoint 118, so as to provide grounding for the first radiation portion E1. The second ground portion 16 is disposed inside the housing 11 and located between the first electronic element 215 and the third electronic element 217. One end of the second grounding portion 16 is electrically connected to the first radiation portion E1, and the other end is electrically connected to the second grounding point 211 through the switching circuit 18, thereby providing grounding for the first radiation portion E1.

In the present embodiment, the frame 112 between the first feeding portion 12 and the first grounding portion 15 forms an antenna radiation path a 1. It is understood that, in the present embodiment, the first feeding portion 12, the Antenna radiation path a1 and the first grounding portion 15 constitute a Planar Inverted F-shaped Antenna (PIFA) Antenna.

It is understood that, referring to fig. 4, when a current is fed from the first feeding element 12, the current is fed into the first radiation element E1 through the first feeding element 12, so as to excite a first mode to generate a radiation signal of a first frequency band (see path P1). In addition, after the current is fed from the first feeding portion 12, the current also flows through the antenna radiation path a1, the first grounding portion 15 and the fourth matching circuit 151 in sequence, and is grounded through the first grounding point 210, so as to excite a second mode to generate a radiation signal of a second frequency band (see path P2).

When a current is fed from the second feeding element 13, the current is fed to the second radiation element E2 through the second feeding element 13, and is grounded, so as to excite a third mode to generate a radiation signal of a third frequency band (see path P3).

When a current is fed from the third feeding element 14, the current is fed into the radiator 20 through the third feeding element 14, and is coupled from the radiator 20 to the second radiation element E2, so as to excite a fourth mode to generate a radiation signal of a fourth frequency band (see path P4).

In this embodiment, the first modality is a long term evolution-Advanced (LTE-a) low frequency modality. The second mode comprises an LTE-A intermediate frequency mode and an LTE-A high frequency mode. The third mode includes a Global Positioning System (GPS) mode and a WIFI2.4GHz mode. The fourth mode is a WIFI5GHz mode. The second frequency band has a higher frequency than the first frequency band. The frequency of the fourth frequency band is higher than the frequency of the third frequency band. The frequency of the first frequency band is 700-960 MHz. The frequencies of the second frequency band are 1710-. The frequencies of the third frequency band are 1575MHz and 2400-2480 MHz. The frequency of the fourth radiation frequency band is 5100-5900 MHz.

Obviously, in this embodiment, the first feeding element 12 and the first radiating element E1 form a first antenna. The first feeding part 12, the antenna radiation path a1, and the first ground part 15 constitute a second antenna. The second feeding element 13 and the second radiation element E2 form a third antenna. The third feeding element 14, the radiator 20 and the second radiating element E2 form a fourth antenna. Wherein the first Antenna is a Planar Inverted-F Antenna (PIFA). The second antenna is a diversity antenna. The third antenna is a GPS antenna and a WIFI2.4 antenna. The fourth antenna is a WIFI5GHz antenna.

Referring to fig. 5, in the present embodiment, the switching circuit 18 includes a switching unit 181 and at least one switching element 183. The switching unit 181 may be a single-pole single-throw switch, a single-pole double-throw switch, a single-pole triple-throw switch, a single-pole four-throw switch, a single-pole six-throw switch, a single-pole eight-throw switch, or the like. The switching unit 181 is electrically connected to the first radiation part E1. The switching element 183 may be an inductor, a capacitor, or a combination of an inductor and a capacitor. The switching elements 183 are connected in parallel, and one end thereof is electrically connected to the switching unit 181, and the other end thereof is electrically connected to the second grounding point 211, i.e., grounded.

In this manner, by controlling the switching of the switching unit 181, the first radiation portion E1 can be switched to a different switching element 183. Since each of the switching elements 183 has different impedance, the frequency band of the first radiation portion E1 can be adjusted by switching of the switching unit 181. For example, in the present embodiment, the switching circuit 18 may include four switching elements 183 having different impedances. By switching the first radiation portion E1 to four different switching elements 183, the low frequency of the first mode in the antenna structure 100 can respectively cover the LTE-a Band8 Band (880-960MHz), the LTE-a Band5 Band (824-894MHz), the LTE-a Band13 Band (746-787MHz), and the LTE-a Band17 Band (704-746 MHz).

Fig. 6 is a graph of S-parameters (scattering parameters) of the antenna structure 100 in the LTE-a low frequency mode when the switching unit 181 is switched to the different switching element 183 in the switching circuit 18 shown in fig. 5. Wherein the curve S701 is the S11 value when the first antenna is switched to one of the switching elements 183, so that the antenna structure 100 operates in the LTE-a Band8 frequency Band (880-960 MHz). The curve S702 is the S11 value when the first antenna is switched to one of the switching elements 183, so that the antenna structure 100 operates in the LTE-a Band5 frequency Band (824-894 MHz). The curve S703 is the S11 value when the first antenna is switched to one of the switching elements 183, so that the antenna structure 100 operates in the LTE-a Band13 frequency Band (746-787 MHz). The curve S704 is the S11 value when the first antenna is switched to one of the switching elements 183, so that the antenna structure 100 operates in the LTE-a Band17 frequency Band (704-746 MHz).

Fig. 7 is a radiation efficiency graph of the antenna structure 100 operating in the LTE-a low frequency mode when the switching unit 181 is switched to the different switching element 183 in the switching circuit 18 shown in fig. 5. Wherein the curve S801 is a radiation efficiency curve when the first antenna is switched to one of the switching elements 183, so that the antenna structure 100 operates in the LTE-a Band8 frequency Band (880-960 MHz). Curve S802 is a radiation efficiency curve when the first antenna is switched to one of the switching elements 183, so that the antenna structure 100 operates in the LTE-a Band5 frequency Band (824-894 MHz). Curve S803 is the radiation efficiency curve when the first antenna is switched to one of the switching elements 183, so that the antenna structure 100 operates in the LTE-a Band13 Band (746-. Curve S804 is a radiation efficiency curve when the first antenna is switched to one of the switching elements 183, so that the antenna structure 100 operates in the LTE-a Band17 frequency Band (704-746 MHz).

Fig. 8 is a graph of S-parameters (scattering parameters) when the antenna structure 100 operates in the LTE-a intermediate frequency mode and the LTE-a high frequency mode when the switching unit 181 switches to different switching elements 183 in the switching circuit 18 shown in fig. 5. The curve S901 is an S11 value when the antenna structure 100 operates in the LTE-a intermediate frequency mode and the LTE-a high frequency mode when the first antenna is switched to the LTE-a Band8 frequency Band (880-960 MHz). The curve S902 is the S11 value when the antenna structure 100 operates in the LTE-a intermediate frequency mode and the LTE-a high frequency mode when the first antenna is switched to the LTE-a Band5 frequency Band (824-894 MHz). The curve S903 is the S11 value when the antenna structure 100 operates in the LTE-a intermediate frequency mode and the LTE-a high frequency mode when the first antenna is switched to the LTE-a Band13 frequency Band (746-787 MHz). The curve S904 is the S11 value when the antenna structure 100 operates in the LTE-a intermediate frequency mode and the LTE-a high frequency mode when the first antenna is switched to the LTE-a Band17 frequency Band (704-746 MHz).

Fig. 9 is a radiation efficiency graph of the antenna structure 100 operating in the LTE-a intermediate frequency mode and the LTE-a high frequency mode when the switching unit 181 is switched to different switching elements 183 in the switching circuit 18 shown in fig. 5. The curve S1001 is a radiation efficiency curve when the first antenna is switched to the LTE-a Band8 frequency Band (880-960MHz), and the antenna structure 100 operates in the LTE-a intermediate frequency mode and the LTE-a high frequency mode. The curve S1002 is a radiation efficiency curve when the first antenna is switched to the LTE-a Band5 frequency Band (824-894MHz), and the antenna structure 100 operates in the LTE-a intermediate frequency mode and the LTE-a high frequency mode. The curve S1003 is a radiation efficiency curve when the first antenna is switched to the LTE-a Band13 frequency Band (746-787MHz), and the antenna structure 100 operates in the LTE-a intermediate frequency mode and the LTE-a high frequency mode. The curve S1004 is a radiation efficiency curve diagram when the antenna structure 100 operates in the LTE-a intermediate frequency mode and the LTE-a high frequency mode when the first antenna is switched to the LTE-a Band17 frequency Band (704 — 746 MHz).

Fig. 10 is a graph illustrating S parameters (scattering parameters) of the antenna structure 100 operating in a GPS mode and a WIFI2.4GHz mode.

Fig. 11 is a radiation efficiency curve diagram of the antenna structure 100 operating in the GPS mode and the WIFI2.4GHz mode.

Fig. 12 is a graph illustrating S-parameters (scattering parameters) of the antenna structure 100 operating in the WIFI5GHz mode.

Fig. 13 is a graph of the radiation efficiency of the antenna structure 100 operating at WIFI5 GHz.

It is obvious from fig. 6 to 13 that the first feeding portion 12, the first radiating portion E1, the first ground portion 15, the antenna radiation path a1, and the second ground portion 16 in the antenna structure 100 are mainly used to excite the LTE-a low frequency mode, the LTE-a intermediate frequency mode, and the LTE-a high frequency mode, and the switching circuit 18 is used to switch the low frequency of the antenna structure 100 to at least cover the LTE-a Band8 Band (880-960MHz), the LTE-a Band5 Band (824-894MHz), the LTE-a Band13 Band (746-787MHz), and the LTE-a Band17 Band (704-746 MHz). The second feeding portion 13 and the second radiating portion E2 in the antenna structure 100 are mainly used for exciting a GPS mode and a WIFI2.4GHz mode. The third feeding portion 14, the radiator 20, and the second radiation portion E2 in the antenna structure 100 are mainly used for exciting a WIFI5GHz mode.

Furthermore, when the antenna structure 100 operates in the LTE-a Band8 frequency Band (880-960MHz), the LTE-a Band5 frequency Band (824-894MHz), the LTE-a Band13 frequency Band (746-787MHz) and the LTE-a Band17 frequency Band (704-746MHz), the LTE-a intermediate frequency Band, the LTE-a high frequency Band, the GPS frequency Band, the WIFI2.4GHz frequency Band and the WIFI5GHz frequency Band of the antenna structure 100 are not affected. That is, when the switching circuit 18 switches, the switching circuit 18 is only used to change the LTE-a low-frequency mode of the antenna structure 100 and does not affect the LTE-a intermediate-frequency mode, the LTE-a high-frequency mode, the GPS mode, the WIFI2.4GHz mode, and the WIFI5GHz mode.

Example 2

It is understood that in other embodiments, the positions of the first breaking point 118 and the second breaking point 119 can be adjusted according to specific situations. For example, as shown in fig. 14, the first breaking point 118b is opened at a position of the second side portion 117 near the end portion 115. The second break point 119b is opened at a position of the distal portion 115 close to the first side portion 116. The antenna structure 100 of this embodiment is left-right reversed from the antenna structure 100 of the previous embodiment.

Example 3

Referring to fig. 15, an antenna structure 100a according to a third preferred embodiment of the present invention is applicable to a wireless communication device 200a, such as a mobile phone, a personal digital assistant, etc., for transmitting and receiving radio waves to transmit and exchange wireless signals.

The antenna structure 100a at least includes a back plate 113, a frame 112, a first feeding part 12, a second feeding part 13, a third feeding part 14a, a first grounding part 15, a second grounding part 16, a first matching circuit 17, a second matching circuit 131, a third matching circuit 141, a fourth matching circuit 151a, a switching circuit 18a, a radiator 20a, a first extension segment 121, and a second extension segment 122.

The antenna structure 100a further includes a first grounding point 210, a second grounding point 211, a first feeding point 212, a second feeding point 213 and a third feeding point 214.

The frame 112 is provided with a first breaking point 118, a second breaking point 119 and a slot 120. In the present embodiment, the first breaking point 118 and the second breaking point 119 are both communicated with the slot 120.

In the present embodiment, the slot 120, the first break point 118 and the second break point 119 jointly define a first radiation portion E1 and a second radiation portion E2 spaced apart from the frame 112. Wherein the border 112 between the first break point 118 and the second break point 119 constitutes the first radiation portion E1. The bezel 112 of the second break point 119 on the side away from the first radiation portion E1 and the first break point 118 constitutes the second radiation portion E2.

A portion of the first feeding part 12 to the second ground part 16 constitutes an antenna radiation path A1 a. It is understood that, in the present embodiment, the first feeding portion 12, the antenna radiation path A1a and the second grounding portion 16 constitute an inverted F antenna.

It is understood that, in the present embodiment, the antenna structure 100a is different from the antenna structure 100 in that the position of the fourth matching circuit 151a in the antenna structure 100a is different from the position of the fourth matching circuit 151 in the antenna structure 100. In the present embodiment, the fourth matching circuit 151a is electrically connected to the second ground portion 16, but not to the first ground portion 15.

It is understood that, in the present embodiment, the antenna structure 100a is different from the antenna structure 100 in that the position of the switching circuit 18a in the antenna structure 100a is different from the position of the switching circuit 18 in the antenna structure 100. In the present embodiment, the switching circuit 18a is electrically connected to the first ground 15, but not to the second ground 16.

It is understood that, in the present embodiment, the antenna structure 100a is different from the antenna structure 100 in that the position and the structure of the radiator 20a in the antenna structure 100a are different from the position and the structure of the radiator 20 in the antenna structure 100. Specifically, the radiator 20a is disposed in the accommodating space 114 and spans the second extending segment 122, but is not disposed adjacent to the second break point 119. The radiator 20a is a straight bar and does not include the connection portion 21, the first extension 22, and the second extension 23. The radiator 20a may be a Flexible Printed Circuit (FPC) or formed using a Laser Direct Structuring (LDS) process.

It can be understood that, in the present embodiment, the antenna structure 100a is different from the antenna structure 100 in that the position of the third feeding element 14a in the antenna structure 100a is different from the position of the third feeding element 14 in the antenna structure 100. The third feeding element 14a is disposed adjacent to the second extending segment 122, and is not located between the second feeding element 13 and the first electronic element 215.

In this embodiment, one end of the third feeding element 14a is electrically connected to the radiator 20a, and the other end is electrically connected to the third feeding point 214 through a third matching circuit 141, so as to feed a current signal to the radiator 20a, wherein the current signal is coupled from the radiator 20a to the second extension segment 122.

It is understood that, in the present embodiment, the antenna structure 100a is different from the antenna structure 100 in that the current path of the antenna structure 100a is not identical to the current path of the antenna structure 100. Specifically, referring to fig. 16, in the present embodiment, after the current is fed from the first feeding element 12, the current is fed into the first radiation element E1 through the first feeding element 12, so as to excite a first mode to generate a radiation signal of a first frequency band (see path P1 a). In addition, after the current is fed from the first feeding portion 12, the current also sequentially flows through the antenna radiation path A1a, the second grounding portion 16 and the fourth matching circuit 151a, and is grounded through the second grounding point 211, so as to excite a second mode to generate a radiation signal of a second frequency band (see path P2 a).

When the third feeding element 14a feeds a current, the current is fed into the radiator 20a through the third feeding element 14a, and is coupled from the radiator 20a to the second extension segment 122 and the slot 120, so as to excite a fourth mode to generate a radiation signal of a fourth frequency band (see path P4 a).

Obviously, in this embodiment, the first feeding element 12 and the first radiating element E1 form a first antenna. The first feeding part 12, the antenna radiation path A1a, and the second grounding part 16 constitute a second antenna. The second feeding element 13 and the second radiation element E2 form a third antenna. The third feeding portion 14a, the radiator 20a, the second extension segment 122 and the slot 120 form a fourth antenna. Wherein the first Antenna is a Planar Inverted-F Antenna (PIFA). The second antenna is a diversity antenna. The third antenna is a Global Positioning System (GPS) antenna or a WIFI2.4 antenna. The fourth antenna is a slot antenna and is also a WIFI5GHz antenna.

In other embodiments, the radiator 20a may also be disposed in the accommodating space 114 and span the first extending segment 121. In this way, one end of the third feeding element 14a is electrically connected to the radiator 20a, and the other end is electrically connected to the third feeding point 214 through the third matching circuit 141, so as to feed a current signal into the radiator 20a, wherein the current signal is coupled from the radiator 20a to the first extension segment 121 and the slot 120. The third feeding portion 14a, the radiator 20a, the first extension segment 121 and the slot 120 form a fourth antenna, so as to excite a fourth mode to generate a radiation signal of a fourth frequency band.

In other embodiments, the antenna structure 100 and the fourth antenna of the antenna structure 100a may be interchanged.

Fig. 17 is a graph of S-parameters (scattering parameters) of the antenna structure 100a operating in the LTE-a low frequency mode. Where the curve S1701 is the S11 value when the first antenna is switched to one of the switching elements 183 so that the antenna structure 100 operates in the LTE-A Band8 Band (880-960 MHz). The curve S1702 is the S11 value when the first antenna is switched to one of the switching elements 183, so that the antenna structure 100 operates in the LTE-a Band5 frequency Band (824-894 MHz). The curve S1703 is the S11 value when the first antenna is switched to one of the switching elements 183, so that the antenna structure 100 operates in the LTE-a Band13 Band (746-. The curve S1704 is the S11 value when the first antenna is switched to one of the switching elements 183 so that the antenna structure 100 operates in the LTE-a Band17 frequency Band (704-746 MHz).

Fig. 18 is a radiation efficiency graph of the antenna structure 100a operating in the LTE-a low frequency mode. Wherein the curve S1801 is a radiation efficiency curve when the first antenna is switched to one of the switching elements 183, so that the antenna structure 100 operates in the LTE-a Band8 frequency Band (880-960 MHz). Curve S1802 is a graph of the radiation efficiency when the first antenna is switched to one of the switching elements 183, so that the antenna structure 100 operates in the LTE-a Band5 frequency Band (824-894 MHz). Curve S1803 is a radiation efficiency curve when the first antenna is switched to one of the switching elements 183, so that the antenna structure 100 operates in the LTE-a Band13 frequency Band (746-. Curve S1804 is a graph of radiation efficiency when the first antenna is switched to one of the switching elements 183, so that the antenna structure 100 operates in the LTE-a Band17 frequency Band (704-746 MHz).

Fig. 19 is a graph of S-parameters (scattering parameters) when the antenna structure 100 operates in the LTE-a intermediate frequency mode and the LTE-a high frequency mode. The curve S1901 is an S11 value when the antenna structure 100a operates in the LTE-a intermediate frequency mode and the LTE-a high frequency mode when the first antenna is switched to the LTE-a Band8 frequency Band (880-960 MHz). The curve S1902 is the S11 value when the antenna structure 100a operates in the LTE-a intermediate frequency mode and the LTE-a high frequency mode when the first antenna is switched to the LTE-a Band5 frequency Band (824-894 MHz). The curve S1903 is the S11 value when the antenna structure 100a operates in the LTE-a intermediate frequency mode and the LTE-a high frequency mode when the first antenna is switched to the LTE-a Band13 frequency Band (746-787 MHz). The curve S1904 is the S11 value when the antenna structure 100a operates in the LTE-a intermediate frequency mode and the LTE-a high frequency mode when the first antenna is switched to the LTE-a Band17 frequency Band (704-.

Fig. 20 is a radiation efficiency curve diagram of the antenna structure 100a operating in the LTE-a intermediate frequency mode and the LTE-a high frequency mode. The curve S2001 is a radiation efficiency curve when the first antenna is switched to the LTE-a Band8 frequency Band (880-960MHz), and the antenna structure 100a operates in the LTE-a intermediate frequency mode and the LTE-a high frequency mode. The curve S2002 is a radiation efficiency curve when the first antenna switches to the LTE-a Band5 frequency Band (824-894MHz), and the antenna structure 100a operates in the LTE-a intermediate frequency mode and the LTE-a high frequency mode. The curve S2003 is a radiation efficiency curve diagram when the antenna structure 100a operates in the LTE-a intermediate frequency mode and the LTE-a high frequency mode when the first antenna is switched to the LTE-a Band13 frequency Band (746-. The curve S2004 is a radiation efficiency curve diagram when the antenna structure 100a operates in the LTE-a intermediate frequency mode and the LTE-a high frequency mode when the first antenna is switched to the LTE-a Band17 frequency Band (704 — 746 MHz).

Fig. 21 is a graph illustrating S parameters (scattering parameters) of the antenna structure 100a operating in the GPS mode and the WIFI2.4GHz mode.

Fig. 22 is a radiation efficiency curve diagram of the antenna structure 100a operating in the GPS mode and the WIFI2.4GHz mode.

Fig. 23 is a graph illustrating S-parameters (scattering parameters) of the antenna structure 100a operating in the WIFI5GHz mode.

Fig. 24 is a graph of the radiation efficiency of the antenna structure 100a operating at WIFI5 GHz.

It is obvious from fig. 17 to fig. 24 that the first feeding portion 12, the first radiating portion E1, the first ground portion 15, the antenna radiation path A1a and the second ground portion 16 in the antenna structure 100a are mainly used to excite the LTE-a low frequency mode, the LTE-a intermediate frequency mode and the LTE-a high frequency mode, and the switching circuit 18a is used to switch the low frequency of the antenna structure 100a to at least cover the LTE-a Band8 Band (880 + 960MHz), the LTE-a Band5 Band (824-894MHz), the LTE-a Band13 Band (746-787MHz) and the LTE-a Band17 Band (704-746 MHz). The second feeding portion 13 and the second radiating portion E2 in the antenna structure 100a are mainly used for exciting a GPS mode and a WIFI2.4GHz mode. The third feeding portion 14a, the radiator 20a and the second extending segment 122 in the antenna structure 100a are mainly used for exciting a WIFI5GHz mode.

Furthermore, when the antenna structure 100a operates in the LTE-a Band8 frequency Band (880-960MHz), the LTE-a Band5 frequency Band (824-894MHz), the LTE-a Band13 frequency Band (746-787MHz) and the LTE-a Band17 frequency Band (704-746MHz), the LTE-a intermediate frequency Band, the LTE-a high frequency Band, the GPS frequency Band, the WIFI2.4GHz frequency Band and the WIFI5GHz frequency Band of the antenna structure 100a are not affected. That is, when the switching circuit 18a switches, the switching circuit 18a is only used to change the LTE-a low-frequency mode of the antenna structure 100a and does not affect the LTE-a medium-frequency mode, the LTE-a high-frequency mode, the GPS mode, the WIFI2.4GHz mode, and the WIFI5GHz mode.

Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention. Those skilled in the art can also make other changes and the like in the design of the present invention within the spirit of the present invention as long as they do not depart from the technical effects of the present invention. Such variations are intended to be included within the scope of the invention as claimed.

Claims

1. An antenna structure is applied to a wireless communication device and is characterized in that the antenna structure comprises a metal shell, a first feed-in part, a second feed-in part, a first grounding part and a second grounding part, wherein the metal shell at least comprises a metal back plate and a metal frame, the metal frame and the metal back plate are integrally formed, a first breakpoint, a second breakpoint, a first radiation part and a second radiation part are arranged on the metal frame, a slot and at least one extension section are arranged on the metal back plate, the slot is arranged on the plane edge of the metal back plate and is parallel to the metal frame, and the at least one extension section is vertically connected with one end of the slot and is parallel to the tail end part of the metal frame; one of the first break point and the second break point is arranged at one end of the slot and connected with the extension section; the first breakpoint and the second breakpoint are both through and cut off the metal frame, the metal frame between the first breakpoint and the second breakpoint forms the first radiation part, the first grounding part and the second grounding part are both electrically connected with the first radiation part, and the metal frame of the second breakpoint far away from the first radiation part forms the second radiation part; the first feed-in part is electrically connected with the first radiation part so as to feed in current signals to the first radiation part, and the second feed-in part is electrically connected with the second radiation part so as to feed in current signals to the second radiation part.

2. The antenna structure of claim 1, characterized in that: the frame further comprises a first side portion and a second side portion, the first side portion and the second side portion are respectively connected with two ends of the end portion, the slot is formed in the inner side of the end portion and extends towards the direction of the first side portion and the direction of the second side portion respectively, the first breakpoint is formed in the position, close to the end portion, of the first side portion, and the second breakpoint is formed in the position, close to the second side portion, of the end portion.

3. The antenna structure of claim 2, characterized in that: the at least one extension section comprises a first extension section and a second extension section, one end of the first extension section is vertically connected with the end part of the slot positioned on the first side part and the first break point, and the other end of the first extension section extends along the direction parallel to the tail end part and close to the second side part; one end of the second extension section is perpendicularly connected the fluting is located the one end of second lateral part, the other end of second extension section is along being on a parallel the end portion just is close to the direction of first lateral part extends, the length of first extension section with the length of second extension section is inequality.

4. The antenna structure of claim 3, characterized in that: the antenna structure further comprises a first matching circuit, wherein an antenna radiation path is formed by the first feed-in part and the frame between the first grounding part and one of the second grounding parts, one end of the first feed-in part is connected with the first radiation part and the antenna radiation path, and the other end of the first feed-in part is electrically connected to a first feed-in point through the first matching circuit so as to feed current signals into the first radiation part and the antenna radiation path, so that the first feed-in part and the first radiation part form a planar inverted-F antenna, and the first feed-in part, the antenna radiation path and the first grounding part or the second grounding part form a diversity antenna.

5. The antenna structure of claim 4, characterized in that: the antenna structure further comprises a second matching circuit, one end of the second feed-in part is connected with the second radiation part, and the other end of the second feed-in part is electrically connected to a second feed-in point through the second matching circuit so as to feed in current signals for the second radiation part, so that the second radiation part and the second feed-in part form a GPS antenna and a WIFI2.4GHz antenna.

6. The antenna structure of claim 5, characterized in that: the antenna structure further comprises a radiator, a third feed-in part and a third matching circuit, wherein the radiator is arranged in the shell and spans the first extension section or the second extension section, one end of the third feed-in part is electrically connected to the radiator, the other end of the third feed-in part is electrically connected to a third feed-in point through the third matching circuit, so that the radiator feeds in a current signal, the current signal is coupled to the first extension section or the second extension section through the radiator, and is coupled to the slot, and therefore the third feed-in part, the radiator, the first extension section or the second extension section and the slot form a WIFI5GHz antenna.

7. The antenna structure of claim 6, characterized in that: the antenna structure further comprises a switching circuit and a fourth matching circuit, wherein one end of the first grounding part is electrically connected to a first grounding point through the switching circuit, and the other end of the first grounding part is electrically connected to the first radiation part for providing grounding for the first radiation part; one end of the second grounding part is electrically connected to the first radiation part, and the other end of the second grounding part is electrically connected to the second grounding point through the fourth matching circuit, so that grounding is provided for the first radiation part, and the frame between the first feed-in part and the second grounding part forms the antenna radiation path.

8. The antenna structure of claim 6, characterized in that: the antenna structure further comprises a switching circuit and a fourth matching circuit, wherein one end of the first grounding part is electrically connected to a first grounding point through the fourth matching circuit, and the other end of the first grounding part is electrically connected to the first radiation part for providing grounding for the first radiation part; one end of the second grounding part is electrically connected to the first radiation part, and the other end of the second grounding part is electrically connected to the second grounding point through the switching circuit, so that grounding is provided for the first radiation part, and the frame between the first feed-in part and the first grounding part forms the antenna radiation path.

9. The antenna structure of claim 7, characterized in that: the first feed point is arranged between the first grounding point and the second grounding point, and the second feed point and the third feed point are arranged on one side of the second grounding point far away from the first grounding point.

10. A wireless communication apparatus, characterized in that: the wireless communication device comprising an antenna structure according to any of claims 1-9.

11. The wireless communications apparatus of claim 10, wherein: the wireless communication device comprises a first electronic element, a second electronic element, a third electronic element and a fourth electronic element, wherein the first electronic element, the second electronic element, the third electronic element and the fourth electronic element are all arranged on the same side of the back plate, and the second break point corresponds to the first electronic element, so that the first electronic element is partially exposed from the second break point.