CN112751169B

CN112751169B - Antenna structure and wireless communication device with same

Info

Publication number: CN112751169B
Application number: CN201911063223.1A
Authority: CN
Inventors: 许倬纲; 贺敏慧
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: 2019-10-31
Filing date: 2019-10-31
Publication date: 2023-11-21
Anticipated expiration: 2039-10-31
Also published as: CN112751169A

Abstract

The invention provides an antenna structure, which comprises a shell and a feed-in part, wherein the shell comprises a frame and a back plate, the frame and the back plate are both made of metal materials, the frame is arranged around the edge of the back plate, at least one break point is arranged on the frame, a slot is arranged on the back plate, the slot and the break point jointly divide at least two radiating parts from the frame, the antenna structure further comprises a broadband reflector, the broadband reflector is connected with the frame and extends along the direction parallel to one radiating part, one end of the broadband reflector is connected with the back plate, the feed-in part is electrically connected with one radiating part, and the back plate and the frame except the at least two radiating parts are mutually connected to form a system grounding surface so as to provide grounding for the antenna structure. The antenna structure has a wide bandwidth. The invention also provides a wireless communication device with the antenna structure.

Description

Antenna structure and wireless communication device with same

Technical Field

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

Background

With the progress of wireless communication technology, electronic devices such as mobile phones and personal digital assistants are continuously moving toward functions of more varied, lighter and thinner, faster and more efficient data transmission. However, the space for accommodating the antenna is smaller and smaller, and with the development of wireless communication technology, the bandwidth requirement of the antenna is increasing. 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 foregoing, it is desirable to provide an antenna structure and a wireless communication device having the same.

The utility model provides an antenna structure, includes casing and feed-in portion, the casing includes frame and backplate, the frame with the backplate is made by metal material, the frame centers on the edge setting of backplate, set up at least a breakpoint on the frame, set up the fluting on the backplate, the fluting with at least a breakpoint is jointly followed divide two at least radiating parts on the frame, antenna structure still includes the broadband reflector, the broadband reflector connect in the frame to along being on a parallel with one of them radiating part's direction extends, broadband reflector one end is connected to the backplate, feed-in portion electric connection is to one of them radiating part, the backplate with the frame other than two at least radiating parts interconnect forms the system ground plane, in order to provide ground for antenna structure.

A wireless communication device comprises the antenna structure.

The antenna structure is provided with at least one breakpoint on the frame so as to divide at least two radiation parts from the frame, and the broadband reflectors are arranged at intervals of the radiation parts, so that a plurality of frequency bands such as low frequency, medium frequency and high frequency can be covered, carrier aggregation application (Carrier Aggregation, CA) of LTE-A is satisfied, and radiation of the antenna structure 100 has a broadband effect compared with a common metal back cover antenna, so that broadband design can be effectively realized. In addition, the antenna structure of the invention has a front full screen, and still has good performance in the adverse environment of an all-metal backboard, a frame and a large amount of metal surrounding.

Drawings

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

Fig. 2 is a schematic back view of the wireless communication device shown in fig. 1.

Fig. 3 is a schematic cross-sectional view taken along line III-III of the wireless communication device of fig. 1.

Fig. 4 is a schematic cross-sectional view taken along line IV-IV in the wireless communication device of fig. 1.

Fig. 5 is an internal schematic view of the antenna structure shown in fig. 1.

Fig. 6A to 6D are schematic diagrams of broadband reflectors of the antenna structure shown in fig. 1.

Fig. 7A to 7D are circuit diagrams of switching circuits in the antenna structure shown in fig. 5.

Fig. 8 is a schematic diagram of current flowing during operation of the antenna structure shown in fig. 5.

Fig. 9 is a graph of S-parameters (scattering parameters) of the antenna structure of fig. 1.

Fig. 10 is a diagram of the overall radiation efficiency of the antenna structure of fig. 1.

Description of the main reference signs

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

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the 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 an element is referred to as being "electrically connected" to another element, it can be in contact, e.g., by way of a wire connection, or can be in contactless connection, e.g., by way of 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 herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

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

Referring to fig. 1, 2, 3 and4, 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. Fig. 1 is a schematic diagram of an antenna structure 100 applied to a wireless communication device 200. Fig. 2 is a schematic back view of a wireless communication device 200. Fig. 3 is a schematic cross-sectional view taken along line III-III of the wireless communication device 200 of fig. 1. Fig. 4 is a schematic cross-sectional view along line IV-IV of the wireless communication device 200 shown in fig. 1.

The antenna structure 100 includes a housing 11, a feeding portion 12 (see fig. 5), a broadband reflector (MHR) 13, a first switching circuit 14, and a second switching circuit 15. The housing 11 includes at least a system ground plane 110, a frame 111, a middle frame 112, and a back plate 113. A circuit board 130 is disposed in the space (refer to fig. 4) enclosed by the frame 111, the middle frame 112 and the back plate 113. In this embodiment, the circuit board 130 is stacked on the back plate 113. The system ground plane 110 may be made of metal or other conductive material to provide a ground for the antenna structure 100.

The frame 111 has a substantially annular structure and is made of metal or other conductive material. The frame 111 is disposed at the periphery of the system ground plane 110, i.e., disposed around the system ground plane 110. In this embodiment, the edge of the side of the frame 111 is spaced from the system ground plane 110, so as to form a corresponding headroom 114 (see fig. 3 and 4) therebetween. It will be appreciated that in this embodiment, the distance between the frame 111 and the system ground plane 110 may be adjusted according to the requirements. For example, the frame 111 may be equidistant or non-equidistant from the system ground plane 110 at different locations.

The center 112 is generally rectangular and sheet-like and is made of metal or other conductive material. The shape and size of the center 112 is 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) is disposed on a side of the frame 111 adjacent to the middle frame 112 for accommodating the display unit 201 of the wireless communication device 200. The display unit 201 has a display plane exposed from the opening.

The backplate 113 is made of metal or other conductive material. The back plate 113 is disposed at an edge of the frame 111. In this embodiment, the back plate 113 is disposed on a side of the system ground plane 110 facing away from the middle frame 112, and is disposed in parallel with the display plane of the display unit 201 and the middle frame 112 at a substantially interval.

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 body. 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 a distal 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, i.e., the antenna structure 100 forms a lower antenna of the wireless communication device 200. The first side portion 116 is disposed opposite to the second side portion 117, and is disposed at both ends of the distal end portion 115, preferably vertically.

The housing 11 is also provided with a slot 118 and at least one break point. The slot 118 is formed on the back plate 113. The slot 118 is substantially U-shaped, and is disposed on a side of the back plate 113 near the end portion 115, and extends toward the first side portion 116 and the second side portion 117, respectively.

In this embodiment, two breakpoints, namely a first breakpoint 119 and a second breakpoint 120, are formed on the housing 11. The first break point 119 and the second break point 120 are all disposed on the frame 111. Specifically, the first breakpoint 119 is disposed on the distal portion 115 and is disposed adjacent to the second side portion 117. The second breakpoint 120 is spaced from the first breakpoint 119. The second break point 120 is disposed on the first side portion 116 and is disposed proximate to the distal end portion 115. The first break point 119 and the second break point 120 are all communicated and cut off the frame 111 and are communicated with the slot 118.

The slot 118 and the at least one break point together define at least two radiating portions from the housing 11. In this embodiment, the slot 118, the first breakpoint 119 and the second breakpoint 120 jointly divide the housing 11 into two radiating portions, namely a first radiating portion F1 and a second radiating portion F2. In this embodiment, the frame 111 between the first breakpoint 119 and the second breakpoint 120 forms the first radiating portion F1. The border 111, between the first break 119 and the end point of the slot 118 at the second side 117, forms the second radiating portion F2.

In this embodiment, the first radiating portion F1 is spaced apart from the middle frame 112 and is insulated from the middle frame. The side of the second radiating portion F2 near the end point of the slot 118 at the second side portion 117 is connected to the system ground plane 110 and the back plate 113, i.e. grounded. That is, in the present embodiment, the slot 118 is used to separate the frame radiator (i.e. the first radiating portion F1 and the second radiating portion F2) and the back plate 113. Of course, the slot 118 may also separate the frame radiator from the system ground plane 110, while the frame 111, the back plate 113 and the system ground plane 110 are connected at portions other than the slot 118.

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

It is understood that in the present 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 limited thereto).

Referring to fig. 5, the wireless communication device 200 further includes at least one electronic component. In this embodiment, the wireless communication device 200 includes at least two electronic components, namely a first electronic component 21 and a second electronic component 23.

The first electronic component 21 is a universal serial bus (Universal Serial Bus, USB) interface module. The first electronic component 21 is disposed on the circuit board 130 adjacent to the edge of the first radiating portion F1, and is spaced apart from the first radiating portion F1 by the slot 118. The second electronic component 23 is a speaker. The second electronic component 23 is disposed on a side of the circuit board 130 adjacent to the first radiating portion F1. In this embodiment, the distance between the second electronic component 23 and the slot 118 is approximately 2-10mm. In this embodiment, the second electronic component 23 is also disposed at a distance from the first radiation portion F1 through the slot 118.

It will be appreciated that in other embodiments, the position of the second electronic component 23 may be adjusted according to specific requirements.

Referring to fig. 4 and fig. 5 together, in the present embodiment, the system ground plane 110 is substantially box-shaped, i.e. the system ground plane 110 has a certain thickness. It can be appreciated that in the present embodiment, when the system ground plane 110 is box-shaped, the at least one electronic component can be fully embedded into the system ground plane 110, and the at least one electronic component can be regarded as the system ground plane 110, i.e. a large area metal. Of course, when the at least one electronic component is fully placed in the system ground plane 110, the system ground plane 110 also needs to reserve corresponding openings, connectors, etc. so that the portion of the at least one electronic component that needs to be in contact with the external component can be exposed from the system ground plane 110.

It will be appreciated that in other embodiments, the system ground plane 110 is not limited to the box shape described above, but may be other shapes.

It will be appreciated that in this embodiment, the display unit 201 has a high screen duty cycle. I.e. the area of the display plane of the display unit 201 is larger than 70% of the frontal area of the wireless communication device, even a frontal full screen can be achieved. Specifically, in this embodiment, the full screen means that the left side, the right side, and the lower side of the display unit 201 can be seamlessly connected to the frame 111 except for the necessary slots (such as slots 118) formed on the antenna structure 100.

It can be appreciated that in the present embodiment, the feeding portion 12 is disposed in the headroom area 114 between the system ground plane 110 and the frame 111. One end of the feeding portion 12 may be electrically connected to a signal feeding point on the circuit board 130 by means of a spring, a microstrip line, a strip line, a coaxial cable, etc., and the other end is electrically connected to a side of the first radiating portion F1 near the first break point 119 by means of a matching circuit (not shown), so as to feed a current signal to the first radiating portion F1 and the second radiating portion F2.

In this embodiment, the feeding element 12 may be made of iron, metal copper foil, a conductor in a laser direct structuring (Laser Direct structuring, LDS) process, and the like.

The broadband reflector 13 is substantially in the form of a metal sheet. The top end of the broadband reflector 13 is abutted to the middle frame 112, and the bottom end is abutted to the back plate 113 (refer to fig. 4). The broadband reflector 13 has one end connected to the second side 117 of the frame 111 and extends in a direction parallel to the second radiation portion F2. The broadband reflector 13 has at least a plane parallel to the second radiation portion F2. The broadband reflector 13 includes a first segment 132, a second segment 134, and a third segment 136 connected in sequence. The first section 132 is a substantially straight section and is substantially perpendicularly connected to the second side 117 of the frame 111. The second segment 134 is a substantially arc-shaped segment, and is spaced apart from a portion of the second radiating portion F2 where the second side portion 117 is connected to the distal end portion 115. The third segment 136 is substantially a straight segment, and is spaced apart from a portion of the second radiating portion F2 located at the distal end portion 115 in parallel.

Referring to fig. 6A, 6B, 6C and 6D, in various embodiments, the third section 136 of the broadband reflector 13 may have different lengths. In the broadband reflector 13 shown in fig. 6A, the third section 136 extends beyond the first break point 119; in the broadband reflector 13 shown in fig. 6B, the third segment 136 extends to correspond to the first break point 119; in the broadband reflector 13 shown in fig. 6C, the third segment 136 does not extend beyond the first break point 119; the broadband reflector 13 is not included in the antenna structure shown in fig. 6D.

One end of the first switching circuit 14 is electrically connected to a side of the first radiating portion F1 near the second breakpoint 120, and the other end is electrically connected to the system ground plane 110, i.e. the ground. The first switching circuit 14 is configured to effectively adjust the bandwidth of the antenna structure 100 by switching the first radiating portion F1 to the system ground plane 110, so that the first radiating portion F1 is not grounded, or switching the first radiating portion F1 to a different grounding position (corresponding to switching to a different impedance element), so as to achieve a multi-frequency adjustment function.

One end of the second switching circuit 15 is electrically connected to the middle position of the first radiating portion F1, and the other end is electrically connected to the system ground plane 110, i.e. the ground. The second switching circuit 15 is disposed at a distance from the feeding element 12. In this embodiment, the feeding portion 12 and the second switching circuit 15 are respectively disposed at two opposite sides of the first electronic component 21 at intervals. The second switching circuit 15 is configured to effectively adjust the bandwidth of the antenna structure 100 by switching the first radiating portion F1 to the system ground plane 110, so that the first radiating portion F1 is not grounded, or switching the first radiating portion F1 to a different grounding position (corresponding to switching to a different impedance element), so as to achieve a multi-frequency adjustment function.

It is understood that in the present embodiment, the specific structures of the first switching circuit 14 and the second switching circuit 15 may take various forms, for example, a single-path switch, a multi-path switch, a single-path switch matching element, a multi-path switch matching element, and the like. The first switching circuit 14 and the second switching circuit 15 may have the same structure, and the first switching circuit 14 will be described as an example.

Referring to fig. 7A, in one embodiment, the first switching circuit 14 includes a single-path switch 14a. The one-way switch 14a includes a movable contact a1 and a stationary contact a2. The movable contact a1 is electrically connected to the first radiating portion F1. The stationary contact a2 of the one-way switch 14a is electrically connected to the system ground plane 110. In this way, the first radiating portion F1 is electrically connected to or disconnected from the system ground plane 110 by controlling the on/off state of the one-way switch 14a, i.e. the first radiating portion F1 is controlled to be grounded or not grounded, so as to achieve the function of multi-frequency adjustment.

It will be appreciated that referring to fig. 7B, in one embodiment, the first switching circuit 14 includes a plurality of switches 14B. In this embodiment, the multi-way switch 14b is a four-way switch. The multiple switch 14b includes a movable contact b1, a first stationary contact b2, a second stationary contact b3, a third stationary contact b4, and a fourth stationary contact b5. The movable contact b1 is electrically connected to the first radiating portion F1. The first, second, third and fourth stationary contacts b2, b3, b4 and b5 are electrically connected to different positions of the system ground plane 110, respectively.

By controlling the switching of the movable contact b1, the movable contact b1 can be switched to the first, second, third and fourth stationary contacts b2, b3, b4 and b5, respectively. Thus, the first radiating portion F1 is electrically connected to different positions of the system ground plane 110, so as to achieve the function of multi-frequency adjustment.

It will be appreciated that referring to fig. 7C, in one embodiment, the first switching circuit 14 includes a one-way switch 14C and a matching element 141. The one-way switch 14c includes a movable contact c1 and a stationary contact c2. The movable contact c1 is electrically connected to the first radiating portion F1. The stationary contact c2 is electrically connected to the system ground plane 110 through the matching element 141. The matching element 141 has a predetermined impedance. The matching element 141 may comprise an inductance, a capacitance, or a combination of an inductance and a capacitance.

Referring to fig. 7D, in one embodiment, the first switching circuit 14 includes a plurality of switches 14D and at least one matching element 143. In the present embodiment, the multi-way switch 14d is a four-way switch, and the first switching circuit 14 includes three matching elements 143. The multiple switch 14d includes a movable contact d1, a first stationary contact d2, a second stationary contact d3, a third stationary contact d4, and a fourth stationary contact d5. The movable contact d1 is electrically connected to the first radiating portion F1. The first, second and third stationary contacts d2, d3 and d4 are electrically connected to the system ground plane 110 by respective mating elements 143, respectively. And the fourth stationary contact d5 is arranged in a suspending manner. Each of the matching elements 143 has a predetermined impedance, and the predetermined impedances of the matching elements 143 may be the same or different. Each matching element 143 may include an inductance, a capacitance, or a combination of inductance and capacitance. The location at which each matching element 143 is electrically connected to the system ground plane 110 may be the same or different.

It is understood that by controlling the switching of the movable contact d1, the movable contact d1 can be switched to the first, second, third and fourth stationary contacts d2, d3, d4 and d5, respectively. In this way, the first radiating portion F1 is electrically connected to the system ground plane 110 or disconnected from the system ground plane 110 through different matching elements 143, so as to achieve the function of multi-frequency adjustment.

It will be appreciated that in other embodiments, the first switching circuit 14 is not limited to being electrically connected to the first radiating portion F1, and its position may be adjusted according to specific requirements. For example, the first switching circuit 14 may be electrically connected to the second radiating portion F2.

Referring to fig. 8, a current path diagram of the antenna structure 100 is shown. When the current is fed into the feeding portion 12, the current flows through the first radiating portion F1 and flows to the second break point 120 (reference path P1). Thus, the first radiation portion F1 forms a Monopole antenna, so as to excite a first operation mode to generate a radiation signal in a first radiation frequency band.

After the current is fed into the feeding portion 12, the current flows through the first radiating portion F1 and the second radiating portion F2, the current flows to the broadband reflector 13 along the frame 111, the current flows through the broadband reflector 13, and finally flows into the system ground plane 110 and the middle frame 112, i.e. the ground (reference path P2). Thus, the second radiating portion F2 forms a loop (loop) antenna, so as to excite a second working mode to generate a radiation signal of a second radiation frequency band.

After the current is fed into the feeding portion 12, the current flows into the second radiation portion F2, the current flows to the broadband reflector 13 along the frame 111, the current flows through the broadband reflector 13, and then flows into the system ground plane 110 and the middle frame 112, i.e. the ground (reference path P3), so as to excite a third working mode to generate a radiation signal of a third radiation frequency band.

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

It can be appreciated that in this embodiment, the frame 111 and the system ground plane 110 are electrically connected by a connection manner such as a spring, welding, or 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, the electrical connection point between the two is close to the feeding portion 12, so that the low frequency of the antenna structure 100 is shifted toward the high frequency. When the electrical connection point between the two is far away from the feeding portion 12, the low frequency of the antenna structure 100 is shifted toward the low frequency.

Fig. 9 is a graph showing S-parameters (scattering parameters) of the antenna structure 100 with the broadband reflector 13 shown in fig. 6A to 6D. The curve S91 is the S11 value of the antenna structure 100 when working with the broadband reflector 13 shown in fig. 6A. The curve S92 is the S11 value of the antenna structure 100 when working with the broadband reflector 13 shown in fig. 6B. Curve S93 is the S11 value of the antenna structure 100 when working with the broadband reflector 13 shown in fig. 6C. Curve S94 is the S11 value when the antenna structure 100 shown in fig. 6D is operated without the broadband reflector 13 included in the antenna structure 100.

Fig. 10 is a graph showing the total radiation efficiency of the antenna structure 100 and the broadband reflector 13 shown in fig. 6A to 6D. The curve S101 is the total radiation efficiency value of the antenna structure 100 when working with the broadband reflector 13 shown in fig. 6A. Curve S102 is the total radiation efficiency value of the antenna structure 100 when working with the broadband reflector 13 shown in fig. 6B. Curve S103 is the total radiation efficiency value of the antenna structure 100 when working with the broadband reflector 13 shown in fig. 6C. Curve S104 is the total radiation efficiency value of the antenna structure 100 in operation, which does not include the broadband reflector 13, i.e. the antenna structure 100 shown in fig. 6D.

As is apparent from fig. 9 and 10, the antenna structure 100 is provided with the broadband reflectors 13 at intervals, and the first switching circuit 14 and the second switching circuit 15 are provided to switch each low frequency mode of the antenna structure 100, so that the low frequency bandwidth can be effectively improved and the best antenna efficiency can be achieved. Furthermore, when the antenna structure 100 is operated in the LTE-A low frequency band (700-960 MHz), the LTE-A intermediate frequency band (1710-2170 MHz) and the high frequency band (2300-2690 MHz), respectively, the communication frequency band commonly used in the world is covered. Specifically, the antenna structure 100 may cover GSM 850/900/WCDMASband 5/Band8/Band13/Band17/Band20 at low frequency, GSM1800/1900/WCDMA 2100 (1710-2170 MHz), LTE-A Band7, band40, band41 (2300-2690 MHz) at high frequency. The design frequency Band of the antenna structure 100 may be applied to the operations of the GSM Qual-Band, UMTS Band I/II/V/VIII frequency bands, and the global common LTE 850/900/1800/1900/2100/2300/2500 frequency Band.

In summary, the antenna structure 100 of the present invention includes at least two radiating portions (e.g., the first radiating portion 119 and the second radiating portion 120) on the frame 111, and the broadband reflector 13 is disposed at intervals between the radiating portions (e.g., the second radiating portion F2). The antenna structure 100 further includes the first switching circuit 14 and the second switching circuit 15 at the end portions of different radiating portions (e.g., the first radiating portion F1 and the second radiating portion F2). Therefore, a plurality of frequency bands such as low frequency, medium frequency, high frequency and the like can be covered by different switching modes, so that carrier aggregation application (Carrier Aggregation, CA) of LTE-A is satisfied, and the radiation of the antenna structure 100 has a wider frequency effect compared with a common metal back cover antenna. In addition, it will be appreciated that the antenna structure 100 of the present invention has a front full screen, and that the antenna structure 100 still performs well in the hostile environment of an all-metal back plate 113, a bezel 111, and a large amount of metal surrounding.

The above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present invention. Those skilled in the art can make other changes and modifications within the spirit of the invention, which are intended to be within the scope of the invention, without departing from the technical spirit of the invention. Such variations, which are in accordance with the spirit of the invention, are intended to be included within the scope of the invention as claimed.

Claims

1. The antenna structure is characterized by comprising a shell and a feed-in part, wherein the shell comprises a frame and a back plate, the frame and the back plate are made of metal materials, the frame is arranged around the edge of the back plate, at least one break point is formed on the frame, a slot is formed on the back plate, the slot and the break point jointly divide at least two radiating parts from the frame, the antenna structure further comprises a broadband reflector, the broadband reflector is connected to the frame and extends along a direction parallel to one radiating part, one end of the broadband reflector is connected to the back plate, the feed-in part is electrically connected to one radiating part, and the back plate and the frames except the at least two radiating parts are mutually connected to form a system grounding surface, so that the antenna structure is grounded; the antenna structure further comprises a middle frame made of metal materials, the system grounding surface further comprises the middle frame, the broadband reflector is made of metal sheets, and the other end of the broadband reflector is connected to the middle frame.

2. An antenna structure as claimed in claim 1, wherein: the antenna structure further comprises a first switching circuit and a second switching circuit, one ends of the first switching circuit and the second switching circuit are electrically connected to one of the radiation parts, and the other ends of the first switching circuit and the second switching circuit are electrically connected to the system grounding surface.

3. An antenna structure as claimed in claim 2, wherein: the first switching circuit and the second switching circuit have the same structure, each switching circuit comprises a single-way switch, the single-way switch comprises a movable contact and a static contact, the movable contact is electrically connected to one of the radiation parts, the static contact is directly electrically connected to the system ground plane or is electrically connected to the system ground plane through a matching element, and the matching element has preset impedance.

4. An antenna structure as claimed in claim 2, wherein: the first switching circuit and the second switching circuit have the same structure, each switching circuit comprises a multi-way switch, the multi-way switch comprises a movable contact, a first fixed contact, a second fixed contact, a third fixed contact and a fourth fixed contact, the movable contact is electrically connected to one of the radiation parts, the first fixed contact, the second fixed contact and the third fixed contact are directly and electrically connected to different positions of the system ground plane or are electrically connected to different positions of the system ground plane through corresponding matching elements, and the fourth fixed contact is directly and electrically connected to the system ground plane or is arranged in a suspending mode and has preset impedance.

5. An antenna structure as claimed in claim 1, wherein: the middle frame and the backboard are arranged in parallel.

6. An antenna structure as in claim 5, wherein: the feed-in part is arranged in a clearance area between the middle frame and the frame.

7. An antenna structure as claimed in claim 2, wherein: the frame at least comprises a terminal part, a first side part and a second side part, wherein the first side part and the second side part are respectively connected with two ends of the terminal part, the slot is formed in one side of the backboard close to the terminal part and extends towards the direction where the first side part and the second side part are located, two break points are formed in the frame, the two break points comprise a first break point and a second break point, the first break point and the second break point are arranged on the frame at intervals, the frame between the first break point and the second break point forms a first radiation part, the first break point and the frame between the end points of the slot on the second side part form a second radiation part, the feed-in part is electrically connected to the first radiation part so as to enable current to reach the first radiation part and the second radiation part, the first switching circuit is electrically connected to the end part of the first radiation part close to the second break point, and the second switching circuit is electrically connected to the middle part and is arranged at intervals.

8. The antenna structure of claim 7, wherein: one end of the broadband reflector is connected to the second side part of the frame and extends along the direction parallel to the second radiation part, the broadband reflector at least has a plane parallel to the second radiation part, and the broadband reflector comprises a first section, a second section and a third section which are connected in sequence; the first section is a straight line section which is vertically connected with the second side part of the frame, the second section is an arc section, the interval is parallel to the part of the second radiation part, which is positioned at the connection part of the second side part and the tail end part, the third section is a substantially straight line section, and the interval is parallel to the part of the second radiation part, which is positioned at the tail end part.

9. An antenna structure as claimed in claim 8, wherein: the third segment of the broadband reflector extends beyond the first break point.

10. An antenna structure as claimed in claim 8, wherein: the third segment of the broadband reflector extends to correspond to the first break point.

11. An antenna structure as claimed in claim 8, wherein: the third segment of the broadband reflector does not extend beyond the first break point.

12. An antenna structure as claimed in claim 8, wherein: when the feed-in part feeds in current, the current flows through the first radiation part and flows to the first breakpoint, so that a first working mode is excited to generate a radiation signal of a first radiation frequency band; when the feed-in part feeds in current, the current flows through the first radiation part and the second radiation part, the current flows to the broadband reflector along the frame, and the current flows into the system grounding surface after flowing through the broadband reflector, so that a second working mode is excited to generate a radiation signal of a second radiation frequency band; when the feed-in part feeds in current, the current flows through the second radiation part, the current flows to the broadband reflector along the frame, and the current flows into the system grounding surface after flowing through the broadband reflector, so that a third working mode is excited to generate radiation signals of a third radiation frequency band; the frequency of the first radiation frequency band is lower than the frequency of the second radiation frequency band, and the frequency of the second radiation frequency band is lower than the frequency of the third radiation frequency band.

13. The antenna structure of claim 12, wherein: the first working mode is a long term evolution technology upgrade (Long Term Evolution Advanced, LTE-A) low-frequency mode, the second working mode is an LTE-A intermediate-frequency mode, the third working mode is an LTE-A high-frequency mode, the frequency of the first radiation frequency band is 700-960MHz, the frequency of the second radiation frequency band is 1710-2170MHz, and the frequency of the third radiation frequency band is 2300-2690MHz.

14. A wireless communication device comprising an antenna structure according to any of claims 1-13.

15. The wireless communications apparatus of claim 14, wherein: the wireless communication device further comprises a first electronic element and a second electronic element, wherein the first electronic element is arranged adjacent to the end part of the first radiation part, which is close to the first breakpoint, and is arranged in an insulating way with the first radiation part at intervals through the slot; the feed-in part and the second switching circuit are respectively arranged at two opposite sides of the first electronic element; the second electronic element is arranged adjacent to the end part of the first radiating part, which is close to the second breakpoint, and is arranged in an insulating way with the first radiating part at intervals through the slot.