CN112751169A - Antenna structure and wireless communication device with same - Google Patents

Antenna structure and wireless communication device with same Download PDF

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Publication number
CN112751169A
CN112751169A CN201911063223.1A CN201911063223A CN112751169A CN 112751169 A CN112751169 A CN 112751169A CN 201911063223 A CN201911063223 A CN 201911063223A CN 112751169 A CN112751169 A CN 112751169A
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China
Prior art keywords
radiation
antenna structure
frame
switching circuit
electrically connected
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Granted
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CN201911063223.1A
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Chinese (zh)
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CN112751169B (en
Inventor
许倬纲
贺敏慧
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Shenzhen Futaihong Precision Industry Co Ltd
Chiun Mai Communication Systems Inc
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Shenzhen Futaihong Precision Industry Co Ltd
Chiun Mai Communication Systems Inc
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Application filed by Shenzhen Futaihong Precision Industry Co Ltd, Chiun Mai Communication Systems Inc filed Critical Shenzhen Futaihong Precision Industry Co Ltd
Priority to CN201911063223.1A priority Critical patent/CN112751169B/en
Priority to TW109127256A priority patent/TWI756778B/en
Priority to US17/084,951 priority patent/US11342669B2/en
Publication of CN112751169A publication Critical patent/CN112751169A/en
Application granted granted Critical
Publication of CN112751169B publication Critical patent/CN112751169B/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/44—Details of, or arrangements associated with, antennas using equipment having another main function to serve additionally as an antenna, e.g. means for giving an antenna an aesthetic aspect
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/48—Earthing means; Earth screens; Counterpoises
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/20—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements characterised by the operating wavebands
    • H01Q5/28—Arrangements for establishing polarisation or beam width over two or more different wavebands
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
    • H01Q5/314—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors
    • H01Q5/328—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors between a radiating element and ground
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/50—Feeding or matching arrangements for broad-band or multi-band operation

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Aerials With Secondary Devices (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)

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 breakpoint is arranged on the frame, a slot is arranged on the back plate, the slot and the breakpoint jointly divide at least two radiation parts from the frame, the antenna structure also comprises a broadband reflector, the broadband reflector is connected to the frame and extends along a direction parallel to one of the radiation parts, one end of the broadband reflector is connected to the back plate, the feed-in part is electrically connected to one of the radiation parts, and the back plate and the frame except the at least two radiation parts are mutually connected to form a system ground plane 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 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 antenna structure 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 breakpoint is arranged on the frame, a slot is arranged on the back plate, the slot and the breakpoint jointly divide at least two radiation 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 of the radiation parts, one end of the broadband reflector is connected to the back plate, the feed-in part is electrically connected to one of the radiation parts, and the frame except the back plate and the at least two radiation parts is mutually connected to form a system ground plane so as to provide grounding for the antenna structure.
A wireless communication device comprises the antenna structure.
Antenna structure is through set up an at least breakpoint on the frame, in order from divide two at least radiation parts on the frame, and the interval radiation part sets up a plurality of frequency channels such as low frequency, intermediate frequency, high frequency can be contained to the broadband reflector so, satisfy LTE-A's Carrier Aggregation application (CA), and make antenna structure 100's radiation has more the wide band effect than general metal back of the body lid antenna, so can effectively realize the wide band design. In addition, the antenna structure of the invention has a front full screen, and the antenna structure still has good performance in the adverse environment of a full-metal back plate, a frame and a large amount of metal around.
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 a rear 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 shown in fig. 1.
Fig. 4 is a schematic cross-sectional view taken along line IV-IV in the wireless communication device shown in 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 the switching circuit in the antenna structure shown in fig. 5.
Fig. 8 is a schematic diagram of the current flow direction of the antenna structure shown in fig. 5 during operation.
Fig. 9 is a graph of the S-parameter (scattering parameter) of the antenna structure shown in fig. 1.
Fig. 10 is a graph of the overall radiation efficiency of the antenna structure shown in fig. 1.
Description of the main elements
Figure BDA0002256667030000021
Figure BDA0002256667030000031
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 an element is referred to as being "electrically connected" to another element, it can be connected by contact, for example, by wires, or by contactless connection, for example, 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.
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.
Referring to fig. 1, fig. 2, fig. 3 and fig. 4, 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 diagram illustrating an application of an antenna structure 100 to a wireless communication device 200. Fig. 2 is a rear view of a wireless communication device 200. Fig. 3 is a schematic cross-sectional view of the wireless communication device 200 shown in fig. 1 along the line III-III. Fig. 4 is a cross-sectional view of the wireless communication device 200 of fig. 1 taken along line IV-IV.
The antenna structure 100 includes a housing 11, a feeding portion 12 (see fig. 5), a wideband-High-Band Reflector (MHR) 13, a first switching circuit 14, and a second switching circuit 15. The housing 11 at least includes a system ground plane 110, a frame 111, a middle frame 112 and a back plate 113. A circuit board 130 is disposed in a space (see fig. 4) surrounded 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 ground for the antenna structure 100.
The frame 111 is a substantially ring-shaped structure, and is made of metal or other conductive material. The frame 111 is disposed on the periphery of the system ground plane 110, i.e., disposed around the system ground plane 110. In the present embodiment, an edge of one side of the frame 111 is spaced apart from the system ground plane 110, so as to form a corresponding clearance area 114 (see fig. 3 and 4) therebetween. It can be understood that, in the present embodiment, the distance between the frame 111 and the system ground plane 110 can be adjusted according to requirements. For example, the bezel 111 may or may not be equidistant from the system ground plane 110 at different locations.
The middle frame 112 is a substantially rectangular sheet made of metal or other conductive material. The shape and size of the middle frame 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 close 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 at the opening.
The back plate 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 substantially spaced from and parallel to the display plane of the display unit 201 and the middle frame 112.
In this embodiment, the system ground plane 110, the frame 111, the middle frame 112 and the back plate 113 may form an integrally formed metal frame. The middle frame 112 is a metal sheet located between the display unit 201 and the system ground plane 110. The middle frame 112 is used for supporting the display unit 201, providing electromagnetic shielding, and improving the mechanical strength of the wireless communication device 200.
In this embodiment, the frame 111 at least includes a terminal portion 115, a first side portion 116 and a second side portion 117. The terminal portion 115 is a bottom end of the wireless communication device 200, i.e., the antenna structure 100 constitutes a lower 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.
The housing 11 is further provided with a slot 118 and at least one breaking point. The slot 118 is opened on the back plate 113. The slot 118 is substantially U-shaped, opens at a side of the back plate 113 close to the end portion 115, and extends towards the first side portion 116 and the second side portion 117 respectively.
In the present embodiment, the housing 11 has two breaking points, namely a first breaking point 119 and a second breaking point 120. The first break point 119 and the second break point 120 are both disposed on the frame 111. Specifically, the first breaking point 119 is opened on the end portion 115 and is disposed close to the second side portion 117. The second break point 120 is spaced apart from the first break point 119. The second breaking point 120 is disposed on the first side portion 116 and is disposed near the end portion 115. The first break point 119 and the second break point 120 are both connected to and separate the frame 111, and are connected to 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 the present embodiment, the slot 118, the first break point 119 and the second break point 120 jointly divide two radiation portions, namely, a first radiation portion F1 and a second radiation portion F2, from the housing 11. In the present embodiment, the frame 111 between the first break point 119 and the second break point 120 forms the first radiation portion F1. The first break point 119 and the border 111 of the slot 118 between the end points of the second side 117 form the second radiating portion F2.
In the present embodiment, the first radiating portion F1 is spaced from and insulated from the middle frame 112. The second radiating portion F2 is connected to the system ground plane 110 and the back plate 113, i.e. grounded, near the side of the slot 118 located at the end of the second side portion 117. That is, in the present embodiment, the slot 118 is used to separate a frame radiator (i.e., the first radiating portion F1 and the second radiating portion F2) from the back plate 113. Of course, the slot 118 may also separate the bezel radiator from the system ground plane 110, and the bezel 111, the back plate 113 and the system ground plane 110 are connected at a portion outside the slot 118.
It can be understood that, in the present 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 open slot 118 is 0.5-2 mm. The widths of the first break point 119 and the second break point 120 are both 1-2 mm.
It is understood that, in the present embodiment, the slot 118, the first breaking point 119 and the second breaking point 120 are all filled with an insulating material (for example, but not limited to, plastic, rubber, glass, wood, ceramic, etc.).
Referring to fig. 5, the wireless communication device 200 further includes at least one electronic component. In the present 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 (USB) interface module. The first electronic element 21 is disposed on the circuit board 130 adjacent to the edge of the first radiation part F1 and is spaced apart from the first radiation part 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 radiation portion F1. In this embodiment, the distance between the second electronic component 23 and the slot 118 is approximately 2-10 mm. In the present embodiment, the second electronic component 23 is also disposed through the slot 118 and spaced apart from the first radiating portion F1.
It is understood that in other embodiments, the position of the second electronic component 23 can be adjusted according to specific requirements.
Referring to fig. 4 and fig. 5, in the present embodiment, the system ground plane 110 is substantially box-shaped, that is, the system ground plane 110 has a certain thickness. It can be understood that, in the present embodiment, when the system ground plane 110 is box-shaped, the at least one electronic element can be fully embedded into the system ground plane 110, and the at least one electronic element 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 needs to reserve a corresponding opening, a corresponding joint, and the like, so that a portion of the at least one electronic component, which needs to be in contact with an external component, can be exposed from the system ground plane 110.
It is understood that in other embodiments, the system ground plane 110 is not limited to the box shape described above, and may have other shapes.
It is understood that, in the present embodiment, the display unit 201 has a high screen duty ratio. That is, the area of the display plane of the display unit 201 is larger than 70% of the area of the front surface of the wireless communication device, and even the front surface can be made into a full screen. Specifically, in the present embodiment, the full screen refers to that the left side, the right side, and the lower side of the display unit 201 can be connected to the frame 111 without gaps except for a necessary slot (e.g., the slot 118) formed in the antenna structure 100.
It is understood that, in the present embodiment, the feeding element 12 is disposed in the clearance 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 through a spring, a microstrip line, a strip line, a coaxial cable, etc., and the other end is electrically connected to one side of the first radiation portion F1 close to the first break point 119 through a matching circuit (not shown) for feeding a current signal to the first radiation portion F1 and the second radiation portion F2.
In this embodiment, the feeding portion 12 may be made of a material such as an iron member, a metal copper foil, a conductor in a Laser Direct Structuring (LDS) process, and the like.
The broadband reflector 13 is substantially a metal sheet. The top end of the broadband reflector 13 abuts against the middle frame 112, and the bottom end abuts against the back plate 113 (see fig. 4). The broadband reflector 13 is connected to the second side 117 of the frame 111 at one end and extends in a direction parallel to the second radiating portion F2. The broadband reflector 13 has at least a plane parallel to the second radiating portion F2. The broadband reflector 13 includes a first segment 132, a second segment 134, and a third segment 136 connected in series. The first segment 132 is substantially a straight segment and is substantially perpendicular to the second side 117 of the frame 111. The second section 134 is a substantially arc-shaped section spaced apart parallel to the second radiating portion F2 at the portion of the second side portion 117 joined to the tip portion 115. The third segment 136 is substantially a straight line segment spaced parallel to the portion of the second radiating portion F2 at the distal end portion 115.
Referring also to fig. 6A, 6B, 6C and 6D, in various embodiments, the third segment 136 of the broadband reflector 13 may have different lengths. In the broadband reflector 13 shown in fig. 6A, the third segment 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 the first radiating portion F1 on the side close to the second break point 120, and the other end is electrically connected to the system ground plane 110, i.e., to ground. The first switching circuit 14 is configured to switch the first radiating portion F1 to the system ground plane 110, so that the first radiating portion F1 is not grounded, or switch the first radiating portion F1 to a different grounding position (corresponding to switching to a different impedance element), thereby effectively adjusting a bandwidth of the antenna structure 100 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 radiation portion F1, and the other end is electrically connected to the system ground plane 110, i.e., to ground. The second switching circuit 15 is disposed at an interval from the feeding portion 12. In this embodiment, the feeding portion 12 and the second switching circuit 15 are disposed on two opposite sides of the first electronic component 21 at an interval. The second switching circuit 15 is configured to switch the first radiating portion F1 to the system ground plane 110, so that the first radiating portion F1 is not grounded, or switch the first radiating portion F1 to a different grounding position (corresponding to switching to a different impedance element), thereby effectively adjusting a bandwidth of the antenna structure 100 to achieve a multi-frequency adjustment function.
It is understood that, in the present embodiment, the specific structure of the first switching circuit 14 and the second switching circuit 15 can be in various forms, for example, it can include a single switch, a multi-switch, a matching element matching the single switch, a matching element matching the multi-switch, 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 is taken as an example for description.
Referring to fig. 7A, in one embodiment, the first switching circuit 14 includes a one-way switch 14 a. The one-way switch 14a includes a movable contact a1 and a stationary contact a 2. 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, by controlling the on/off of the one-way switch 14a, the first radiation part F1 is electrically connected or disconnected with the system ground plane 110, that is, the first radiation part F1 is controlled to be grounded or not grounded, so as to achieve the function of multi-frequency adjustment.
It is understood that referring to fig. 7B, in one embodiment, the first switching circuit 14 includes a multi-way switch 14B. In this embodiment, the multi-way switch 14b is a four-way switch. The multi-way 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 b 5. The movable contact b1 is electrically connected to the first radiating part F1. The first stationary contact b2, the second stationary contact b3, the third stationary contact b4 and the fourth stationary contact 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 fixed contact b2, the second fixed contact b3, the third fixed contact b4 and the fourth fixed contact b5, respectively. Thus, the first radiating portions F1 are electrically connected to different positions of the system ground plane 110, so as to achieve the function of multi-frequency adjustment.
It is understood that referring to fig. 7C, in one embodiment, the first switching circuit 14 includes a one-way switch 14C and a matching device 141. The one-way switch 14c includes a movable contact c1 and a stationary contact c 2. The movable contact c1 is electrically connected to the first radiating part 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 include an inductor, a capacitor, or a combination of an inductor and a capacitor.
Referring to fig. 7D, in one embodiment, the first switching circuit 14 includes a multiplexer 14D and at least one matching device 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 multi-way 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 d 5. The movable contact d1 is electrically connected to the first radiating part F1. The first stationary contact d2, the second stationary contact d3 and the third stationary contact d4 are electrically connected to the system ground plane 110 through the corresponding matching elements 143, respectively. The fourth stationary contact d5 is arranged in air. Each matching element 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 comprise an inductance, a capacitance, or a combination of an inductance and a 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 can be understood that by controlling the switching of the movable contact d1, the movable contact d1 can be switched to the first fixed contact d2, the second fixed contact d3, the third fixed contact d4 and the fourth fixed contact d5, respectively. In this way, the first radiating portion F1 is electrically connected to the system ground plane 110 through different matching elements 143 or disconnected from the system ground plane 110, so as to achieve the function of multi-frequency adjustment.
It is understood that in other embodiments, the first switching circuit 14 is not limited to be electrically connected to the first radiation portion F1, and the position thereof can be adjusted according to specific requirements. For example, the first switching circuit 14 may be electrically connected to the second radiation portion F2.
Fig. 8 is a current path diagram of the antenna structure 100. When the feeding part 12 feeds a current, the current flows through the first radiating part F1 and flows to the second break point 120 (see path P1). Thus, the first radiation portion F1 forms a Monopole (Monopole) antenna, so as to excite a first working mode to generate a radiation signal of the first radiation frequency band.
When the feeding part 12 feeds a current, the current flows through the first radiating part F1 and the second radiating part F2, flows to the broadband reflector 13 along the frame 111, flows through the broadband reflector 13, and finally flows into the system ground plane 110 and the middle frame 112, i.e., to ground (see path P2). Thus, the second radiation portion F2 forms a loop antenna, so as to excite a second working mode to generate a radiation signal of a second radiation frequency band.
When the feeding part 12 feeds a current, the current flows into the second radiation part 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 (see 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 low-frequency mode of Long Term Evolution Advanced (LTE-a), 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 700-960 MHz. The frequency of the second radiation frequency band is 1710-2170 MHz. The frequency of the third radiation frequency band is 2300-2690 MHz.
It can be understood that, in the present embodiment, the frame 111 and the system ground plane 110 are electrically connected through a connection method such as a spring, a solder, a probe, and the like. The position of the electrical connection point between the frame 111 and the system ground plane 110 can be adjusted according to the desired low frequency. For example, if the electrical connection point between the two is close to the feeding portion 12, 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 of S-parameters (scattering parameters) of the antenna structure 100 in combination with the broadband reflector 13 shown in fig. 6A to 6D. The curve S91 is the S11 value of the antenna structure 100 when operating with the broadband reflector 13 shown in fig. 6A. Curve S92 is the S11 value of the antenna structure 100 when operating with the broadband reflector 13 shown in fig. 6B. Curve S93 is the S11 value of the antenna structure 100 when operating with the broadband reflector 13 shown in fig. 6C. Curve S94 is the value of S11 when the antenna structure 100 does not include the broadband reflector 13, i.e., the antenna structure 100 shown in fig. 6D is in operation.
Fig. 10 is a graph of the total radiation efficiency of the antenna structure 100 in combination with the broadband reflector 13 shown in fig. 6A to 6D. The curve S101 is a 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 operating with the broadband reflector 13 shown in fig. 6B. Curve S103 is the total radiation efficiency value of the antenna structure 100 when operating with the broadband reflector 13 shown in fig. 6C. Curve S104 is the total radiation efficiency value of the antenna structure 100 not including the broadband reflector 13, i.e. the antenna structure 100 shown in fig. 6D is in operation.
As can be seen from fig. 9 and 10, the broadband reflectors 13 are disposed at intervals, and the first switching circuit 14 and the second switching circuit 15 are disposed in the antenna structure 100 to switch the low-frequency modes of the antenna structure 100, so as to effectively improve the low-frequency bandwidth and achieve the best antenna efficiency. Furthermore, when the antenna structure 100 respectively operates in the LTE-a low frequency band (700-. Specifically, the antenna structure 100 can cover GSM850/900/WCDMABand5/Band8/Band13/Band17/Band20 at low frequency, cover GSM1800/1900/WCDMA 2100 (1710-. The designed frequency Band of the antenna structure 100 can be applied to operation of GSM Qual-Band, UMTS Band I/II/V/VIII frequency Band and LTE 850/900/1800/1900/2100/2300/2500 frequency Band commonly used in the world.
In summary, the antenna structure 100 of the present invention divides at least two radiation portions from the frame 111 by disposing at least one break point (e.g., the first break point 119 and the second break point 120) on the frame 111, and disposing the broadband reflector 13 at a distance from the radiation portion (e.g., the second radiation portion F2). The antenna structure 100 further includes the first switching circuit 14 and the second switching circuit 15 at the ends of different radiation portions (e.g., the first radiation portion F1 and the second radiation portion F2). Therefore, a plurality of frequency bands such as low frequency, intermediate frequency, high frequency and the like can be covered by different switching modes, Carrier Aggregation (CA) of LTE-a is satisfied, and the radiation of the antenna structure 100 has a wider frequency effect compared with a general metal back cover antenna. In addition, it is understood that the antenna structure 100 of the present invention has a front full screen, and the antenna structure 100 still has good performance in the adverse environment of the full metal back plate 113, the frame 111, and the large amount of metal around.
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 (15)

1. An antenna structure, characterized in that the antenna structure comprises a housing and a feed-in part, the housing 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, the frame is provided with at least one breakpoint, the back plate is provided with a slot, the slot and the at least one breakpoint are divided into at least two radiation parts from the frame together, the antenna structure further includes a broadband reflector coupled to the bezel, and extends along the direction parallel to one of the radiation parts, one end of the broadband reflector is connected to the back plate, the feed-in part is electrically connected to one of the radiation parts, and the backboard and the frames except the at least two radiation parts are mutually connected to form a system ground plane so as to provide grounding for the antenna structure.
2. The antenna structure of claim 1, characterized in that: the antenna structure further comprises a first switching circuit and a second switching circuit, wherein one end of each of the first switching circuit and the second switching circuit is electrically connected to one of the radiating parts, and the other end of each of the first switching circuit and the second switching circuit is electrically connected to the system ground plane.
3. The antenna structure of claim 2, characterized in that: the first switching circuit and the second switching circuit have the same structure, each switching circuit comprises a single-circuit switch, the single-circuit switch comprises a movable contact and a fixed contact, the movable contact is electrically connected to one of the radiating parts, the fixed 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. The antenna structure of claim 2, characterized in that: the first switching circuit and the second switching circuit have the same structure, each switching circuit comprises a multi-way switch, each 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 radiating parts, the first fixed contact, the second fixed contact and the third fixed contact are directly 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, the fourth fixed contact is directly electrically connected to the system ground plane or is arranged in a suspended mode, and the matching elements have preset impedance.
5. The antenna structure of claim 1, characterized in that: the antenna structure further comprises a middle frame, the middle frame is made of metal materials, the middle frame and the back plate are arranged in parallel, the system ground plane further comprises the middle frame, the broadband reflector is a metal sheet, and the other end of the broadband reflector is connected to the middle frame.
6. The antenna structure of claim 5, characterized in that: the feed-in part is arranged in a clearance area between the middle frame and the frame.
7. The antenna structure of claim 2, characterized in that: the frame at least comprises a tail part, a first side part and a second side part, the first side part and the second side part are respectively connected with two ends of the tail part, the slot is arranged on one side of the backboard close to the tail part and respectively extends towards the direction of the first side part and the second side part, two breakpoints are arranged on the frame, the two breakpoints comprise a first breakpoint and a second breakpoint, the first breakpoint and the second breakpoint are arranged on the frame at intervals, the frame between the first breakpoint and the second breakpoint forms a first radiation part, the frame between the first breakpoint and the endpoint of the slot on the second side part forms a second radiation part, the feed-in part is electrically connected to the first radiation part so as to feed in current to the first radiation part and the second radiation part, and the first switching circuit is electrically connected to the end part of the first radiation part close to the second breakpoint, the second switching circuit is electrically connected to the middle position of the first radiation part and is arranged at intervals of the feed-in part.
8. The antenna structure of claim 7, characterized in that: 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 sequentially connected; the first section is a straight line section and is vertically connected to the second side portion of the frame, the second section is an arc-shaped section and is parallel to the portion, connected with the tail end portion, of the second radiation portion at intervals, and the third section is approximately a straight line section and is parallel to the portion, connected with the tail end portion, of the second radiation portion at intervals.
9. The antenna structure of claim 8, characterized in that: the third section of the broadband reflector extends beyond the first break point.
10. The antenna structure of claim 8, characterized in that: the third section of the broadband reflector extends to the position corresponding to the first break point.
11. The antenna structure of claim 8, characterized in that: the third section of the broadband reflector does not extend beyond the first break point.
12. The antenna structure of claim 8, characterized in that: when the feed-in part feeds in current, the current flows through the first radiation part and flows to the first breakpoint, and then 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, the current flows through the broadband reflector and then flows into the system ground plane, and then 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, the current flows through the broadband reflector and then flows into the system ground plane, and a third working mode is further excited to generate a radiation signal of a third radiation frequency band; the frequency of the first radiation frequency band is lower than that of the second radiation frequency band, and the frequency of the second radiation frequency band is lower than that of the third radiation frequency band.
13. The antenna structure of claim 12, characterized in that: the first working mode is a 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 960MHz, the frequency of the second radiation frequency band is 1710-2170MHz, and the frequency of the third radiation frequency band is 2300-2690 MHz.
14. A wireless communication device comprising an antenna arrangement 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 close to the end part of the first radiation part close to the first breakpoint and is arranged at an interval with the first radiation part in an insulation manner through the slot; the feed-in part and the second switching circuit are respectively arranged on two opposite sides of the first electronic element; the second electronic element is arranged close to the end part of the first radiation part close to the second breakpoint and is arranged at an interval with the first radiation part in an insulation mode through the notch.
CN201911063223.1A 2019-10-31 2019-10-31 Antenna structure and wireless communication device with same Active CN112751169B (en)

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