WO2020024659A1 - 天线系统及移动终端 - Google Patents

天线系统及移动终端 Download PDF

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Publication number
WO2020024659A1
WO2020024659A1 PCT/CN2019/087527 CN2019087527W WO2020024659A1 WO 2020024659 A1 WO2020024659 A1 WO 2020024659A1 CN 2019087527 W CN2019087527 W CN 2019087527W WO 2020024659 A1 WO2020024659 A1 WO 2020024659A1
Authority
WO
WIPO (PCT)
Prior art keywords
ground point
frame
point
antenna
tuning switch
Prior art date
Application number
PCT/CN2019/087527
Other languages
English (en)
French (fr)
Inventor
谷海川
买剑春
Original Assignee
瑞声声学科技(深圳)有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 瑞声声学科技(深圳)有限公司 filed Critical 瑞声声学科技(深圳)有限公司
Publication of WO2020024659A1 publication Critical patent/WO2020024659A1/zh

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Classifications

    • 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
    • H01Q1/243—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 with built-in antennas
    • 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
    • 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
    • H01Q1/2258—Supports; Mounting means by structural association with other equipment or articles used with computer equipment
    • 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
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/28—Combinations of substantially independent non-interacting antenna units or systems
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q23/00—Antennas with active circuits or circuit elements integrated within them or attached to them
    • 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
    • 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
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
    • H01Q5/342—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes
    • H01Q5/35—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes using two or more simultaneously fed points
    • 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

Definitions

  • the present invention relates to the field of communication technologies, and in particular, to an antenna system and a mobile terminal.
  • the control of the length and thickness of the mobile terminal by the terminal manufacturer, and the use of the metal casing will occupy the space of the antenna to a certain extent, which places higher requirements on the design of the antenna.
  • the antenna system When designing an electronic communication product with a metal case, the antenna system must be externally installed or the antenna system must not be surrounded by metal, such as a slit on the side of the metal to facilitate the radiation of the antenna system. .
  • the antenna system of this design has a narrow frequency band and low efficiency. With the reduction in the size of mobile terminals and the need for functions such as multi-frequency and multi-mode, antenna systems of related technologies have been unable to meet development needs.
  • the object of the present invention is to overcome the above technical problems and provide an antenna system capable of realizing multi-frequency multi-mode and multi-band carrier aggregation with good communication performance.
  • the present invention provides an antenna system including a metal frame and a main board housed in the metal frame.
  • the metal frame includes a bottom frame and a top portion that surround the main board and form a clearance area with the main board, respectively.
  • a frame, a first connection rib connecting the bottom frame and the main board, and a second connection rib connecting the top frame and the main board, the top frame and the bottom frame are relatively spaced apart
  • the bottom frame includes A fracture and a first slit and a second slit separated at both ends
  • the top frame includes a third slit on the same side and opposite to the second slit, and a third slit on the same side and opposite to the first slit
  • a fourth slot and an extension extending from an end of the fourth slot near the bottom frame toward the bottom frame, and a portion of the bottom frame extending from the fracture to the first slot is a first radiation
  • the second radiation portion on the bottom frame extending from the fracture to the second gap, and the second frame on the top frame from the second
  • a first tuning switch, a second tuning switch and a first matching network a third feeding point, a fourth feeding point, a third grounding point, a fourth grounding point, a variable capacitor provided on the second main board, A third tuning switch, a fourth tuning switch, and the second matching network;
  • the first feeding point is electrically connected to the first radiating portion
  • the second ground point is electrically connected to the first radiating portion through the first tuning switch
  • the first ground point is connected to the first radiating portion through the first Two tuning switches are electrically connected to the first radiation part
  • the second feeding point is electrically connected to the second radiating portion through the first matching network, and the second radiating portion is grounded through the first connection rib;
  • the third feed point is electrically connected to the third radiating portion through the variable capacitor
  • the fourth ground point is electrically connected to the third radiating portion through the third tuning switch
  • the third A ground point is electrically connected to the third radiating part through the fourth tuning switch
  • the fourth feeding point is electrically connected to the fourth radiating part through the second matching network
  • the third radiating portion and the fourth radiating portion are grounded through the second connection rib.
  • the first feeding point is fed to form a first antenna
  • the second feeding point is fed to form a second antenna
  • the third feeding point is fed to form a third antenna.
  • Feeding through the fourth feeding point to form a fourth antenna, and the working frequencies of the first antenna and the third antenna can both cover the LTE low frequency, and work together to form a 2 ⁇ 2 MIMO mechanism working at the LTE low frequency ;
  • the working frequencies of the first antenna, the second antenna, the third antenna, and the fourth antenna can cover LTE medium and high frequency, and work together to form a 4 ⁇ working in LTE medium and high frequency. 4MIMO mechanism; the working frequency of the fourth antenna can cover the mainstream frequency bands of Wi-Fi 2.4G, Wi-Fi 5G and GNSS.
  • the first tuning switch is provided with a first inductance access state, a second inductance access state, a third inductance access state, and an open state.
  • the The first radiating part is connected to the second ground point or is electrically isolated from the second ground point through one of a first inductance, a second inductance, and a third inductance;
  • the second tuning switch is provided with a first capacitor access state, a second capacitor access state, or an open state.
  • the first radiating part passes the first capacitor and the first capacitor.
  • One of the two capacitors is connected to the first ground point or is isolated from the first ground point;
  • the third tuning switch is provided with a fourth inductance access state, an open circuit state, and a short circuit state.
  • the third tuning switch When the third tuning switch is in a different working state, the third radiating part communicates with the The fourth ground point is connected or isolated from the fourth ground point;
  • the fourth tuning switch is provided with a fifth inductance access state, a third capacitor access state, and an open state.
  • the third radiating part passes the fifth inductance and the first One of the three capacitors is connected to the third ground point or isolated from the third ground point.
  • the first matching network includes a first matching element having one end connected to the second radiating portion and the other end connected to the second feeding point, and one end is connected to the second radiating portion and the other end is grounded.
  • the second matching element is a capacitor, and the second matching element includes a capacitor and an inductor connected in parallel.
  • the second matching network includes a third matching element having one end connected to the fourth radiating portion and the other end connected to the fourth feeding point, and one end is connected to the fourth radiating portion and the other end is grounded.
  • the fourth matching element includes a capacitor and an inductor connected in series, and the fourth matching element is an inductor.
  • the metal frame further includes a middle frame connected at both ends to the bottom frame and the top frame, respectively, and the bottom frame further includes a first main frame and closer to the two ends of the first main frame.
  • Two first side frames bent and extending in the direction of the top frame, and the two first side frames and the middle frame are spaced apart to form the first gap and the second gap, respectively.
  • the second ground point is disposed adjacent to the fracture
  • the first feed point is located between the first ground point and the second ground point, and is disposed near the second ground point
  • the A second feeding point is located between the second gap and the fracture and is disposed adjacent to the fracture.
  • the first connection rib is connected to the second radiating portion and is disposed adjacent to the fracture.
  • the top frame further includes a second main frame disposed opposite to the first main frame, and two second frames extending from both ends of the second main frame in a direction close to the bottom frame.
  • a two-sided frame wherein one of the second side frame and the middle frame are spaced apart to form the third gap, and the other of the second side frame and the extension portion are spaced to form the fourth gap.
  • the extension is connected to the middle frame.
  • the fourth feeding point is located between the second connecting rib and the fourth gap
  • the second connecting rib is located between the fourth feeding point and the fourth ground point and It is arranged near the fourth ground point
  • the third ground point is located between the fourth ground point and the third feeding point and is arranged near the third feeding point.
  • the present invention also provides a mobile terminal including the antenna system according to any one of the foregoing.
  • the bottom frame is divided into a first radiating portion and a second radiating portion by the fracture
  • the top frame is divided into connection points of the second connecting rib and the top frame.
  • a third radiating portion and a fourth radiating portion the first feeding point is electrically connected to the first radiating portion, and the second ground point is electrically connected to the first radiating portion through a first tuning switch, the A first ground point is electrically connected to the first radiating portion through a second tuning switch to form a first antenna;
  • the second feeding point is electrically connected to the second radiating portion through a first matching network, and the first The two radiating portions are grounded through the first connection rib to form a second antenna;
  • the third feeding point is electrically connected to the third radiating portion through a variable capacitor (Tunner), and the fourth ground point is connected through the third
  • a tuning switch is electrically connected to the third radiating part, the third ground point is electrically connected to the third radiating part through a fourth tuning switch, and the third radiat
  • FIG. 1 is a schematic diagram of a three-dimensional assembly structure of an antenna system provided by the present invention.
  • FIG. 2 is a schematic structural diagram of a bottom frame connected to a first circuit board and a top frame connected to a second circuit board of the antenna system shown in FIG. 1;
  • FIG. 3 is a schematic diagram of a circuit connection structure of a specific embodiment of the antenna system shown in FIG. 1;
  • FIG. 4 is a graph showing a simulation result of a return loss of a first antenna in an antenna system provided by the present invention
  • FIG. 5 is a simulation effect curve diagram of a radiation efficiency of a first antenna in an antenna system provided by the present invention
  • FIG. 6 is a graph showing a simulation result of a return loss of a second antenna in the antenna system provided by the present invention.
  • FIG. 7 is a simulation effect curve diagram of a radiation efficiency of a second antenna in an antenna system provided by the present invention.
  • FIG. 8 is a graph showing a return loss simulation effect of a third antenna in the antenna system provided by the present invention.
  • FIG. 9 is a simulation effect curve diagram of the efficiency of the third antenna in the antenna system provided by the present invention.
  • FIG. 10 is a graph showing a return loss simulation result of a fourth antenna in the antenna system provided by the present invention.
  • FIG. 11 is a simulation effect curve diagram of a radiation efficiency of a fourth antenna in an antenna system provided by the present invention.
  • FIG. 12 is a simulation curve diagram of isolation between a first antenna and a third antenna provided by the present invention.
  • FIG. 13 is a simulation curve diagram of the isolation of the third antenna and the fourth antenna and the isolation of the first antenna and the second antenna provided by the present invention.
  • an embodiment of the present invention provides an antenna system 1.
  • the antenna system 1 can be applied to a mobile terminal such as a mobile phone and a tablet.
  • the antenna system 1 includes a metal frame 100, a motherboard 200 accommodated in the metal frame 100, and a first feeding point 10, a second feeding point 20, a first ground point 30, The two ground points 40, the third feeding point 50, the fourth feeding point 60, the third ground point 70, and the fourth ground point 80.
  • the metal frame 100 includes a bottom frame 110, a top frame 120, a middle frame 130 connected at both ends to the bottom frame 110 and the top frame 120, and a first connection connecting the bottom frame 110 and the motherboard 200.
  • the bottom frame 110 and the top frame 120 are opposite to each other.
  • the bottom frame 110, the middle frame 130, and the top frame 120 are connected in order to form a complete structure of the metal frame 100, and all three surround the metal frame 100.
  • the main board 200 is described. Specifically, the bottom frame 110 is spaced from the main board 200 to form a clearance area, the clearance area is ⁇ 4 mm, and the bottom frame 110 and the main board 200 are connected through the first connection rib 150.
  • the top frame 120 is spaced from the main board 200 to form a clearance area, and the clearance area is ⁇ 4 mm.
  • the top frame 120 is connected to the main board 200 through the second connection rib 160. There is no gap between the middle frame 130 and the main board 200, and the inner side of the middle frame 130 is connected to the edge of the main board 200.
  • the bottom frame 110 includes a first main frame 111, two first side frames 112 that are bent and extended from the two ends of the first main frame 111 in a direction close to the middle frame 130, and are divided into two of the two A first slit 113 and a second slit 114 at the ends of the first side frame 112, and a fracture 117 provided on the first main frame 111 and adjacent to the second slit 114.
  • the first slit 113 and the second slit 114 are formed by two first side frames 112 and the middle frame 130 spaced apart from each other.
  • the first slit 113 and the second slit 114 are symmetrically disposed with respect to a symmetry axis parallel to the length direction of the metal frame 100.
  • a portion of the bottom frame 110 extending from the fracture 117 to the first slit 113 is a first radiating portion 101
  • a portion of the bottom frame 110 extending from the fracture 117 to the second slit 114 is Second Radiation Section 102.
  • the top frame 120 includes a second main frame 121 disposed opposite to the first main frame 111, and two bent and extended from two ends of the second main frame 121 toward the middle frame 130 respectively.
  • a second side frame 122, a third slot 123 and a fourth slot 124 which are respectively disposed at the ends of the two second side frames 122, and an end away from the second side frame 122 from the fourth slot 124 is closer to the second side frame 122
  • An extending portion 125 extending in the direction of the middle frame 130.
  • One of the second side frame 122 is spaced apart from the middle frame 130 to form the third gap 123, and the other of the second side frame 122 is spaced apart from the extension 125 to form the fourth gap 124.
  • the third slit 123 and the fourth slit 124 are symmetrically disposed with respect to a symmetry axis parallel to the length direction of the metal frame 100.
  • the extension 125 is connected to the middle frame 130 and the distance from the main board 200 is smaller than the distance between other parts of the top frame 120 and the main board 200, that is, the extension 125 and the main board 200.
  • the clearance area between the two is smaller than the clearance area between the other part of the top frame 110 and the main board 200.
  • the third slit 123 and the second slit 114 are symmetrically disposed with respect to an axis of symmetry parallel to the width direction of the metal frame 100, and the fourth slit 124 and the first slit 113 are related to the width of the metal frame 100
  • the symmetry axes parallel to each other are arranged symmetrically.
  • a portion of the top frame 120 extending from the second connection rib 160 to the third gap 123 is a third radiating portion 103, and the top frame 120 extends from the second connection rib 160 to the extension.
  • the portion of the portion 125 is a fourth radiating portion 104.
  • a headroom area between the top frame 120 and the main board 200, a headroom area between the bottom frame 110 and the main board 200, the first gap 113, the second gap 114, The third gap 123, the fourth gap 124, and the fracture 117 are filled with a non-conductive material 2.
  • the motherboard 200 includes a first motherboard 210 near the bottom frame 110, a second motherboard 220 near the top frame 120, and a connection motherboard 230 connecting the first motherboard 210 and the second motherboard 220.
  • the first main board 210, the second main board 220, and the connection main board 230 are integrally formed. In other embodiments, the first main board 210 and the second main board 220 may be provided separately.
  • the first main board 210 and the second main board 220 may be PCB circuit boards, and the connection main board 230 may be a metal middle frame.
  • the first feeding point 10, the second feeding point 20, the first ground point 30 and the second ground point 40 are disposed on the first main board 210.
  • the second ground point 40 is disposed adjacent to the fracture 117
  • the first feeding point 10 is located between the first ground point 30 and the second ground point 40 and adjacent to the second connection point.
  • Place 40 is set, the second feeding point 20 is located between the second gap 114 and the fracture 117 and is adjacent to the fracture 117, and the first connecting rib 150 is connected to the second radiation portion 102
  • the first connecting rib 150 is located near the fracture 117 and is located between the fracture 117 and the second feeding point 20.
  • the first feeding point 10 is electrically connected to the first radiating portion 101, and the second ground point 40 is electrically connected to the first radiating portion 101 through a first tuning switch (SW1) 300, and the first The ground point 30 is electrically connected to the first radiating part 101 through a second tuning switch (SW2) 400.
  • the first radiating part 101, the first feeding point 10, the first ground point 30, the second ground point 40, the first tuning switch (SW1) 300, and the second tuning switch (SW2) 400 collectively constitutes a first antenna.
  • the first tuning switch (SW1) 300 is provided with a first inductance access state 310, a second inductance access state 320, a third inductance access state 330, and an open state 340.
  • the first tuning switch 300 when the first tuning switch 300 is in the first inductance access state 310, the first radiating part 101 is connected to the second ground point 40 through the first inductance L1; when the first tuning switch 300 When 300 is in the second inductance access state 320, the first radiating part 101 is connected to the second ground point 40 through the second inductance L2; when the first tuning switch 300 is in the third inductance access state 330 , The first radiating portion 101 is connected to the second ground point 40 through a third inductor L3; when the first tuning switch 300 is in an open state, the first radiating portion 101 and the second ground point 40 galvanic isolation.
  • the values of the first inductor L1, the second inductor L2, and the third inductor L3 are 1.5 nH, 2.2 nH, and
  • the second tuning switch (SW2) 400 is provided with a first capacitor access state 410, a second capacitor access state 420, and an open state 430.
  • first capacitor access state 410 when the second tuning switch 400 is in the first capacitor access state 410, the first radiating part 101 is connected to the first ground point 30 through the first capacitor C1; when the second tuning switch is in the When the second capacitor is in the state 420, the first radiating section 101 is connected to the first ground point 30 through the second capacitor C2; when the second tuning switch is in the open state 430, the first radiating section 101 is electrically isolated from the first ground point 30.
  • the first capacitor C1 and the second capacitor C2 are fixed-value capacitive devices with values of 0.8 pF and 1.5 pF, respectively. In this embodiment, the return loss and efficiency of each working frequency band of the first antenna are shown in FIG. 4 and FIG. 5.
  • the second feeding point 20 is electrically connected to the second radiating portion 102 through a first matching network 500, and the second radiating portion 102 is grounded through the first connection rib 150.
  • the second radiating portion 102, the second feeding point, the first matching network 500, and the first connecting rib 150 collectively constitute a second antenna.
  • the first matching network 500 includes a first matching element 510 with one end connected to the second radiating part 102 and the other end connected with the second feeding point 20 and one end connected with the second feeding point 20 and The second matching element 520 is grounded at the other end.
  • the first matching element 510 is a capacitor.
  • the second matching element 520 includes a capacitor and an inductor connected in parallel. In this embodiment, the return loss and efficiency of each working frequency band of the second antenna are shown in FIGS. 6 and 7.
  • the third feeding point 50, the fourth feeding point 60, the third ground point 70 and the fourth ground point 80 are disposed on the second main board 220.
  • the fourth feeding point 60 is located between the second connecting rib 160 and the fourth gap 124, and the second connecting rib 160 is located between the fourth feeding point 60 and the fourth ground point 80. Between the fourth ground point 80 and the third feed point 50 and near the third feed point 50 .
  • the third feeding point 50 is electrically connected to the third radiating portion 103 through a variable capacitor (Tunner) 600, and the fourth ground point 80 is connected to the third radiating portion through a third tuning switch (SW3) 700 103 is electrically connected, the third ground point 70 is electrically connected to the third radiation portion 103 through a fourth tuning switch (SW4) 800, and the third radiation portion 103 is grounded through the second connection rib 160.
  • the third radiating section 103, the third feeding point 50, the variable capacitor (Tunner) 600, the second link 160, the third tuning switch (SW3) 700, and the fourth The tuning switch (SW4) 800 collectively constitutes a third antenna.
  • the third tuning switch (SW3) 700 is provided with a fourth inductance access state 710, an open state 720, and a short circuit state 730.
  • the third tuning switch 700 when the third tuning switch 700 is in the fourth inductance access state 710, the third radiating part 103 is connected to the fourth ground point 80 through the fourth inductance; when the third tuning switch is in the open circuit In the state 720, the third radiating portion 103 is electrically isolated from the fourth ground point 80; when the third tuning switch is in a short-circuit state 730, the third radiating portion 103 is connected to the first radiating portion through a 0 ohm resistor Four ground points 80 are connected.
  • the fourth inductor L4 is 16nH.
  • the fourth tuning switch (SW4) 800 is provided with a fifth inductor access state 810, a third capacitor access state 820, and an open state 830.
  • the third radiating section 103 is connected to the third ground point 70 through the fifth inductance L5;
  • the fourth tuning switch is in the In the third capacitive state 820, the third radiating portion 103 is connected to the third ground point 70 through a third capacitor C3;
  • the fourth tuning switch is in the open state 830, the third radiating portion 103 and The third ground point is electrically isolated.
  • the fifth inductor L5 is 1.2 nH
  • the third capacitor C3 is 0.3 pF.
  • the return loss and efficiency of each working frequency band of the third antenna are shown in FIGS. 8 and 9.
  • the fourth feeding point 60 is electrically connected to the fourth radiating portion 104 through a second matching network 900, and the fourth radiating portion 104 is grounded through the second connection rib 160.
  • the fourth radiating part 104, the fourth feeding point 60, the second matching network 900, and the second connecting rib 160 together constitute a fourth antenna.
  • the second matching network 900 includes a third matching element 910 with one end connected to the fourth radiating portion 104 and the other end connected to the fourth feeding point 60, and one end is connected to the fourth radiating portion 104.
  • a fourth matching element 920 connected and grounded at the other end.
  • the third matching element 910 includes a capacitor and an inductor connected in series. In this embodiment, the capacitance value is 0.7 pF and the inductance value is 3 nH.
  • the fourth matching element 920 is an inductor. In this embodiment, the inductance value is 3 nH.
  • the return loss and efficiency of each working frequency band of the fourth antenna are shown in FIG. 10 and FIG. 11.
  • the embodiment of the antenna system 100 of the present invention to achieve different frequency bands of LTE by adjusting each tuning switch and variable capacitor is as follows:
  • the first radiating part is electrically connected to the second ground point through an inductance of 1.5nH, and the first radiating part is connected through a 1.5pF capacitor.
  • the third radiating portion is electrically connected to the third feeding point through a variable capacitance of 1.3 pF, and the third radiating portion is electrically isolated from the fourth ground point,
  • the third radiating part is electrically connected to the third ground point through a 0.3 pF capacitor;
  • the first radiating part is electrically connected to the second ground point through a 1.5nH inductor, and the first radiating part is connected to a 1.5pF capacitor.
  • the first ground point is electrically connected
  • the third radiating portion is electrically connected to the third feeding point through a variable capacitor having a capacitance value of 1.1 pF, and the third radiating portion is electrically connected to the fourth ground point. Isolated, the third radiating part is electrically connected to the third ground point through a 0.3 pF capacitor.
  • the first radiating part is electrically connected to the second ground point through an inductance of 2.2nH, and the first radiating part is connected to the The first ground point is electrically connected, the third radiating portion is electrically connected to the third feeding point through a 0.95 pF variable capacitor, and the third radiating portion is electrically isolated from the fourth ground point.
  • the third radiating portion is electrically isolated from the third ground point.
  • the first radiating part is electrically connected to the second ground point through a 5nH inductor, and the first radiating part is connected to the first ground point
  • the third radiating portion is electrically connected to the third feeding point through a variable capacitance of 0.9 pF, and the third radiating portion is electrically connected to the fourth ground point through a 16nH inductor.
  • the three radiating portions are electrically isolated from the third ground point.
  • the first radiating part is electrically connected to the second ground point through a 5nH inductor, and the first radiating part is connected to the first ground
  • the third radiating portion is electrically connected to the third feeding point through a variable capacitance of 0.9 pF, and the third radiating portion is electrically connected to the fourth ground point through a 0 ohm resistor.
  • the third radiating portion is electrically isolated from the third ground point.
  • the first radiating part is electrically isolated from the second ground point, and the first radiating part and the first ground point Electrically isolated, the third radiating portion is electrically connected to the third feeding point through a variable capacitor with a capacitance value of 1.8 pF, and the third radiating portion is electrically connected to the fourth ground point through a 0 ohm resistor, The third radiating part is electrically connected to the third ground point through an inductor having an inductance value of 1.2 nH.
  • FIG. 12 and FIG. 13 are simulation curves of isolation between antennas of the antenna system provided by the present invention.
  • the antenna system 100 forms a first antenna through the first feed point, forms a second antenna through the second feed point, and feeds through the third feed point.
  • a third antenna is formed by electricity, and a fourth antenna is formed by feeding through the fourth feed point.
  • the working frequencies of the first antenna and the third antenna can both cover the LTE low frequency, and the specific frequency band is 699 to 960 MHz.
  • the cooperative work constitutes a 2 ⁇ 2 MIMO mechanism working at the LTE low frequency.
  • the working frequencies of the two antennas, the third antenna, and the fourth antenna can cover LTE medium and high frequencies, and the specific frequency band is 1710 ⁇ 2690MHz, and their cooperative work constitutes a 4 ⁇ 4 MIMO mechanism working in LTE medium and high frequencies;
  • the working frequency of the fourth antenna can cover Wi-Fi 2.4G and Wi-Fi 5G, and the specific frequency bands are 2400 ⁇ 2500MHz and 5150 ⁇ 5850MHz.
  • the first antenna works as an LTE main antenna
  • the third antenna works as an LTE diversity antenna
  • the working frequency of the fourth antenna may also cover the mainstream GNSS frequency band.
  • the present invention also provides a mobile terminal.
  • the mobile terminal includes the technical features of the antenna system described above. Of course, applying the antenna system also has the above technical effects.
  • the size of the mobile terminal is 80mm ⁇ 160mm, and the 3D glass screen.
  • the bottom frame is separated by the fracture into a first radiating portion and a second radiating portion
  • the top frame is separated by the second connecting rib and the connection point of the top frame.
  • a third radiating portion and a fourth radiating portion the first feeding point is electrically connected to the first radiating portion, and the second ground point is electrically connected to the first radiating portion through a first tuning switch, the A first ground point is electrically connected to the first radiating portion through a second tuning switch to form a first antenna;
  • the second feeding point is electrically connected to the second radiating portion through a first matching network, and the first The two radiating portions are grounded through the first connection rib to form a second antenna;
  • the third feeding point is electrically connected to the third radiating portion through a variable capacitor (Tunner), and the fourth ground point is connected through the third
  • a tuning switch is electrically connected to the third radiating part, the third ground point is electrically connected to the third radiating part through a fourth tuning switch, and the third

Abstract

本发明提供了一种天线系统及移动终端。所述天线系统，包括金属边框、收容于所述金属边框内的主板及设于所述主板的第一馈电点、第二馈电点、第一接地点、第二接地点、第三馈电点、第四馈电点、第三接地点、第四接地点、第一调谐开关、第二调谐开关、第一匹配网络、可变电容、第三调谐开关、第四调谐开关和所述第二匹配网络，所述金属边框被分隔成位于底部的第一辐射部和第二辐射部及位于顶部的第三辐射部和第四辐射部。本发明提供的天线系统实现了LTE低频的2×2MIMO机制和LTE中、高频的4×4MIMO机制，覆盖Wi-Fi2.4G和Wi-Fi5G的工作频率，并同时支持GNSS所述主流频段，通讯性能更优。

Description

天线系统及移动终端 技术领域
本发明涉及通讯技术领域，尤其涉及一种天线系统及移动终端。
 背景技术
随着移动通讯技术的发展，手机、PAD、笔记本电脑等逐渐成为生活中不可或缺的电子产品，并且该类电子产品都更新为增加天线系统使其具有通讯功能的电子通讯产品。但消费者不再仅满足于其应用功能，对所述电子通讯产品的外观要求也不断提高。金属壳体、3D玻璃屏幕的所述电子通讯产品具有良好的质感和美感，因此受到不少消费者的欢迎。
终端厂商对于移动终端的长度和厚度的控制，以及金属壳体的使用都会在一定程度上挤占天线的空间，给天线的设计提出了更高的要求。在设计金属壳体的电子通讯产品时，通常须将所述天线系统外置、或者使所述天线系统不被金属所包围，比如在金属侧边上开缝，以利于所述天线系统的辐射。但这种设计的所述天线系统的频段窄，效率低。随着移动终端的尺寸缩小、多频多模等功能的需要，相关技术的天线系统已无法满足发展需要。
因此，有必要提供一种新的天线系统解决上述问题。
 技术问题
本发明的目的是克服上述技术问题，提供一种能实现多频多模、多频段载波聚合，通讯性能良好的天线系统。
 技术解决方案
为了实现上述目的，本发明提供一种天线系统，包括金属边框及收容于所述金属边框内的主板，所述金属边框包括环绕所述主板且分别与所述主板形成净空区域的底部边框和顶部边框、连接所述底部边框与所述主板的第一连接筋及连接所述顶部边框与所述主板的第二连接筋，所述顶部边框和所述底部边框相对间隔设置，所述底部边框包括断口及分设于其两端的第一缝隙和第二缝隙，所述顶部边框包括与所述第二缝隙位于同一侧且相对设置的第三缝隙、与所述第一缝隙位于同一侧且相对设置的第四缝隙及自所述第四缝隙靠近所述底部边框的一端向所述底部边框方向延伸的延伸部，所述底部边框上从所述断口延伸至所述第一缝隙的部位为第一辐射部，所述底部边框上从所述断口延伸至所述第二缝隙的部位为第二辐射部，所述顶部边框上从所述第二连接筋延伸至所述第三缝隙的部位为第三辐射部，所述顶部边框上从所述第二连接筋延伸至所述延伸部的部位为第四辐射部，所述主板包括靠近所述底部边框的第一主板及靠近所述顶部边框的第二主板，所述天线系统还包括设于所述第一主板的第一馈电点、第二馈电点、第一接地点、第二接地点、第一调谐开关、第二调谐开关和第一匹配网络、设于所述第二主板的第三馈电点、第四馈电点、第三接地点、第四接地点、可变电容、第三调谐开关、第四调谐开关和所述第二匹配网络；其中，
所述第一馈电点与所述第一辐射部电连接，所述第二接地点通过所述第一调谐开关与所述第一辐射部电连接，所述第一接地点通过所述第二调谐开关与第所述第一辐射部电连接；
所述第二馈电点通过所述第一匹配网络与所述第二辐射部电连接，所述第二辐射部通过所述第一连接筋接地；
所述第三馈电点通过所述可变电容与所述第三辐射部电连接，所述第四接地点通过所述第三调谐开关与所述第三辐射部电连接，所述第三接地点通过所述第四调谐开关与所述第三辐射部电连接；
所述第四馈电点通过所述第二匹配网络与所述第四辐射部电连接；
所述第三辐射部和所述第四辐射部通过所述第二连接筋接地。
优选地，通过所述第一馈电点馈电以形成第一天线，通过所述第二馈电点馈电以形成第二天线，通过所述第三馈电点馈电以形成第三天线，通过所述第四馈电点馈电以形成第四天线，所述第一天线和所述第三天线的工作频率均可覆盖LTE低频，并协同工作构成工作于LTE低频的2×2MIMO机制；所述第一天线、所述第二天线、所述第三天线和所述第四天线的工作频率均可覆盖LTE中、高频，并协同工作构成工作于LTE中、高频的4×4MIMO机制；所述第四天线的工作频率可覆盖Wi-Fi2.4G、Wi-Fi5G和GNSS主流频段。
优选地，所述第一调谐开关设有第一电感接入状态、第二电感接入状态、第三电感接入状态和断路状态，当所述第一调谐开关在不同工作状态时，所述第一辐射部通过第一电感、第二电感和第三电感中的一个与所述第二接地点连接或者与所述第二接地点电隔离；
所述第二调谐开关设有第一电容接入状态、第二电容接入状态或断路状态，当所述第二调谐开关在不同工作状态时，所述第一辐射部通过第一电容和第二电容中的一个与所述第一接地点连接或者与所述第一接地点隔离；
所述第三调谐开关设有第四电感接入状态、断路状态和短路状态，当所述第三调谐开关在不同工作状态时，所述第三辐射部通过第四电感或者0欧姆电阻与所述第四接地点连接或者与所述第四接地点隔离；
所述第四调谐开关设有第五电感接入状态、第三电容接入状态和断路状态，当所述第四调谐开关在不同工作状态时，所述第三辐射部通过第五电感和第三电容中的一个与所述第三接地点连接或者与所述第三接地点隔离。
优选地，所述第一匹配网络包括一端与所述第二辐射部连接且另一端与所述第二馈电点连接的第一匹配元件及一端与所述第二辐射部连接且另一端接地的第二匹配元件，所述第一匹配元件为电容，所述第二匹配元件包括并联连接的电容和电感。
优选地，所述第二匹配网络包括一端与所述第四辐射部连接且另一端与所述第四馈电点连接的第三匹配元件及一端与所述第四辐射部连接且另一端接地的第四匹配元件，所述第三匹配元件包括串联连接的电容和电感，所述第四匹配元件为电感。
优选地，所述金属边框还包括两端分别与所述底部边框和所述顶部边框连接的中部边框，所述底部边框还包括第一主边框及自所述第一主边框的两端向靠近所述顶部边框方向弯折延伸的两个第一侧边框，两个所述第一侧边框与所述中部边框间隔设置分别形成所述第一缝隙和所述第二缝隙。
优选地，所述第二接地点临近所述断口设置，所述第一馈电点位于所述第一接地点和所述第二接地点之间且临近所述第二接地点设置，所述第二馈电点位于所述第二缝隙和所述断口之间且临近所述断口设置，所述第一连接筋与所述第二辐射部连接且临近所述断口设置。
优选地，所述顶部边框还包括与所述第一主边框正对设置的第二主边框及自所述第二主边框的两端分别向靠近所述底部边框方向弯折延伸的两个第二侧边框，其中一个所述第二侧边框与所述中部边框间隔设置形成所述第三缝隙，另一个所述第二侧边框与所述延伸部间隔设置形成所述第四缝隙，所述延伸部与所述中部边框连接。
优选地，所述第四馈电点位于所述第二连接筋和所述第四缝隙之间，所述第二连接筋位于所述第四馈电点和所述第四接地点之间且临近所述第四接地点设置，所述第三接地点位于所述第四接地点和所述第三馈电点之间且临近所述第三馈电点设置。
本发明同时提供一种移动终端，所述移动终端包括上文任一项所述的天线系统。
 有益效果
与相关技术相比，本发明提供的天线系统，底部边框由所述断口分隔成第一辐射部和第二辐射部，顶部边框由所述第二连接筋和所述顶部边框的连接点分隔成第三辐射部和第四辐射部，所述第一馈电点与所述第一辐射部电连接，所述第二接地点通过第一调谐开关与所述第一辐射部电连接，所述第一接地点通过第二调谐开关与第所述第一辐射部电连接，构成第一天线；所述第二馈电点通过第一匹配网络与所述第二辐射部电连接，所述第二辐射部通过所述第一连接筋接地，构成第二天线；所述第三馈电点通过可变电容（Tunner）与所述第三辐射部电连接，所述第四接地点通过第三调谐开关与所述第三辐射部电连接，所述第三接地点通过第四调谐开关与所述第三辐射部电连接，所述第三辐射部通过所述第二连接筋接地，构成第三天线；所述第四馈电点通过第二匹配网络与所述第四辐射部电连接，所述第四辐射部通过所述第二连接筋接地，构成第四天线；从而使得所述天线系统实现LTE低频的2×2MIMO机制和LTE中、高频的4×4MIMO机制，覆盖Wi-Fi2.4G、Wi-Fi5G的工作频率，并同时支持GNSS所述主流频段，多频多模、多频段载波聚合，通讯性能更优。并且，天线系统内的天线布置于终端的上下左右，横竖屏均能保证信号接入强度。
 附图说明
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其它的附图，其中：
图1为本发明提供的天线系统的立体组装结构示意图；
图2为图1所示天线系统的底部边框与第一电路板连接及顶部边框与第二电路板连接的结构示意图；
图3为图1所示天线系统一种具体实施例的电路连接结构示意图；
图4为本发明提供的天线系统中第一天线的回波损耗仿真效果曲线图；
图5为本发明提供的天线系统中第一天线的辐射效率仿真效果曲线图；
图6为本发明提供的天线系统中第二天线的回波损耗仿真效果曲线图；
图7为本发明提供的天线系统中第二天线的辐射效率仿真效果曲线图；
图8为本发明提供的天线系统中第三天线的回波损耗仿真效果曲线图；
图9为本发明提供的天线系统中第三天线的效率的仿真效果曲线图；
图10为本发明提供的天线系统中第四天线的回波损耗仿真效果曲线图；
图11为本发明提供的天线系统中第四天线的辐射效率的仿真效果曲线图；
图12为本发明提供的第一天线和第三天线间的隔离度仿真曲线图；
图13为本发明提供的第三天线和第四天线的隔离度以及第一天线和第二天线的的隔离度仿真曲线图。
 本发明的实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅是本发明的一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其它实施例，都属于本发明保护的范围。
如图1至图3所示，本发明实施例提供一种天线系统1，所述天线系统1可应用于手机、平板等移动终端。所述天线系统1包括金属边框100、收容于所述金属边框100内的主板200及设于所述主板200的第一馈电点10、第二馈电点20、第一接地点30、第二接地点40、第三馈电点50、第四馈电点60、第三接地点70和第四接地点80。
所述金属边框100包括底部边框110、顶部边框120、两端分别与所述底部边框110和所述顶部边框120连接的中部边框130、连接所述底部边框110和所述主板200的第一连接筋150、连接所述顶部边框120和所述主板200的第二连接筋160。
所述底部边框110和所述顶部边框120相对设置，所述底部边框110、所述中部边框130和所述顶部边框120依次连接围成完整的所述金属边框100结构，且三者均环绕所述主板200设置。具体地，所述底部边框110与所述主板200间隔设置形成净空区域，所述净空区域≤4mm，且所述底部边框110与所述主板200通过所述第一连接筋150连接。所述顶部边框120与所述主板200间隔设置形成净空区域，所述净空区域≤4mm。所述顶部边框120与所述主板200通过所述第二连接筋160连接。所述中部边框130与所述主板200不具有间隙，中部边框130的内侧与主板200的边缘连接。
所述底部边框110包括第一主边框111、自所述第一主边框111的两端分别向靠近所述中部边框130方向弯折延伸的两个第一侧边框112、分设于两个所述第一侧边框112末端的第一缝隙113和第二缝隙114、及设于所述第一主边框111且临近所述第二缝隙114的断口117。第一缝隙113和第二缝隙114由两个所述第一侧边框112与所述中部边框130间隔设置形成。所述第一缝隙113和第二缝隙114关于与所述金属边框100长度方向平行的对称轴对称设置。所述底部边框110上从所述断口117延伸至所述第一缝隙113的部位为第一辐射部101，所述底部边框110上从所述断口117延伸至所述第二缝隙114的部位为第二辐射部102。
所述顶部边框120包括与所述第一主边框111正对设置的第二主边框121、自所述第二主边框121的两端分别向靠近所述中部边框130方向弯折延伸的两个第二侧边框122、分设于两个所述第二侧边框122末端的第三缝隙123和第四缝隙124、自所述第四缝隙124远离所述第二侧边框122的一端向靠近所述中部边框130方向延伸的延伸部125。其中一个所述第二侧边框122与所述中部边框130间隔设置形成所述第三缝隙123，另一个所述第二侧边框122与所述延伸部125间隔设置形成所述第四缝隙124。所述第三缝隙123和所述第四缝隙124关于与所述金属边框100长度方向平行的对称轴对称设置。所述延伸部125与所述中部边框130连接，且与所述主板200的间隔距离小于所述顶部边框120其他部分与所述主板200的间隔距离，即所述延伸部125与所述主板200间的净空区域小于所述顶部边框110其他部分与所述主板200间的净空区域。
所述第三缝隙123和所述第二隙缝114关于与所述金属边框100宽度方向平行的对称轴对称设置，所述第四缝隙124和所述第一缝隙113关于与所述金属边框100宽度方向平行的对称轴对称设置。
所述顶部边框120上从所述第二连接筋160延伸至所述第三缝隙123的部位为第三辐射部103，所述顶部边框120上从所述第二连接筋160延伸至所述延伸部125的部位为第四辐射部104。
进一步地，所述顶部边框120与所述主板200之间的净空区域、所述底部边框110与所述主板200之间的净空区域、所述第一缝隙113、所述第二缝隙114、所述第三缝隙123、所述第四缝隙124及所述断口117内采用非导电材料2填充。
所述主板200包括靠近所述底部边框110的第一主板210、靠近所述顶部边框120的第二主板220及连接所述第一主板210和所述第二主板220的连接主板230。所述第一主板210、所述第二主板220和所述连接主板230一体成型设置。在其他实施例中，所述第一主板210和所述第二主板220可以分体设置。所述第一主板210和所述第二主板220可以为PCB电路板，连接主板230可以为金属中框。
所述第一馈电点10、第二馈电点20、第一接地点30和第二接地点40设于所述第一主板210。具体地，所述第二接地点40临近所述断口117设置，所述第一馈电点10位于所述第一接地点30和所述第二接地点40之间且临近所述第二接地点40设置，所述第二馈电点20位于所述第二缝隙114和所述断口117之间且临近所述断口117设置，所述第一连接筋150与所述第二辐射部102连接且临近所述断口117设置，所述第一连接筋150位于所述断口117与所述第二馈电点20之间。
所述第一馈电点10与所述第一辐射部101电连接，所述第二接地点40通过第一调谐开关（SW1）300与所述第一辐射部101电连接，所述第一接地点30通过第二调谐开关（SW2）400与所述第一辐射部电101连接。所述第一辐射部101、所述第一馈电点10、所述第一接地点30、所述第二接地点40、所述第一调谐开关（SW1）300和所述第二调谐开关（SW2）400共同构成第一天线。
进一步地，所述第一调谐开关（SW1）300设有第一电感接入状态310、第二电感接入状态320、第三电感接入状态330和断路状态340。具体地，当所述第一调谐开关300处于第一电感接入状态310时，所述第一辐射部101通过第一电感L1与所述第二接地点40连接；当所述第一调谐开关300处于第二电感接入状态320时，所述第一辐射部101通过第二电感L2与所述第二接地点40连接；当所述第一调谐开关300处于第三电感接入状态330时，所述第一辐射部101通过第三电感L3与所述第二接地点40连接；当所述第一调谐开关300处于断路状态时，所述第一辐射部101与所述第二接地点40电隔离。所述第一电感L1、所述第二电感L2和所述第三电感L3的值分别为1.5nH、2.2nH和5nH。
所述第二调谐开关（SW2）400设有第一电容接入状态410、第二电容接入状态420和断路状态430。其中，当所述第二调谐开关400处于第一电容接入状态410时，所述第一辐射部101通过第一电容C1与所述第一接地点30连接；当所述第二调谐开关处于第二电容接入状态420时，所述第一辐射部101通过第二电容C2与所述第一接地点30连接；当所述第二调谐开关处于断路状态430时，所述第一辐射部101与所述第一接地点30电隔离。所述第一电容C1和所述第二电容C2为定值电容件，其值分别为0.8pF和1.5pF。在本实施例中，第一天线各个工作频段的回波损耗和效率如图4和图5如示。
所述第二馈电点20通过第一匹配网络500与所述第二辐射部102电连接，所述第二辐射部102通过所述第一连接筋150接地。所述第二辐射部102、所述第二馈电点、所述第一匹配网络500及所述第一连接筋150共同构成第二天线。
所述第一匹配网络500包括一端与所述第二辐射部102连接且另一端与所述第二馈电点20连接的第一匹配元件510及一端与所述第二馈电点20连接且另一端接地的第二匹配元件520。所述第一匹配元件510为电容。所述第二匹配元件520包括并联连接的电容和电感。在本实施例中，第二天线各个工作频段的回波损耗和效率如图6和图7所示。
所述第三馈电点50、第四馈电点60、第三接地点70和第四接地点80设于所述第二主板220。所述第四馈电点60位于所述第二连接筋160和所述第四缝隙124之间，所述第二连接筋160位于所述第四馈电点60和所述第四接地点80之间且临近所述第四接地点80设置，所述第三接地点70位于所述第四接地点80和所述第三馈电点50之间且临近所述第三馈电点50设置。
所述第三馈电点50通过可变电容（Tunner）600与所述第三辐射部103电连接，所述第四接地点80通过第三调谐开关（SW3）700与所述第三辐射部103电连接，所述第三接地点70通过第四调谐开关（SW4）800与所述第三辐射部103电连接，所述第三辐射部103通过所述第二连接筋160接地。所述第三辐射部103、所述第三馈电点50、所述可变电容（Tunner）600、所述第二连筋160、所述第三调谐开关（SW3）700和所述第四调谐开关（SW4）800共同构成第三天线。
进一步地，所述第三调谐开关（SW3）700设有第四电感接入状态710、断路状态720和短路状态730。其中，当所述第三调谐开关700处于第四电感接入状态710时，所述第三辐射部103通过第四电感与所述第四接地点80连接；当所述第三调谐开关处于断路状态720时，所述第三辐射部103与所述第四接地点80电隔离；当所述第三调谐开关处于短路状态730时，所述第三辐射部103通过0欧姆电阻与所述第四接地点80连接。所述第四电感L4为16nH。
所述第四调谐开关（SW4）800设有第五电感接入状态810、第三电容接入状态820和断路状态830。其中，当所述第四调谐开关800处于第五电感接入状态810时，所述第三辐射部103通过第五电感L5与所述第三接地点70连接；当所述第四调谐开关处于第三电容状态820时，所述第三辐射部103通过第三电容C3与所述第三接地点70连接；当所述第四调谐开关处于断路状态830时，所述第三辐射部103与所述第三接地点电70隔离。所述第五电感L5为1.2nH，所述第三电容C3为0.3pF。在本实施例中，第三天线各个工作频段的回波损耗和效率如图8和图9所示。
所述第四馈电点60通过第二匹配网络900与所述第四辐射部104电连接，所述第四辐射部104通过所述第二连接筋160接地。所述第四辐射部104、所述第四馈电点60、所述第二匹配网络900和所述第二连接筋160共同构成第四天线。
进一步地，所述第二匹配网络900包括一端与所述第四辐射部104连接且另一端与所述第四馈电点60连接的第三匹配元件910及一端与所述第四辐射部104连接且另一端接地的第四匹配元件920，所述第三匹配元件910包括串联连接的电容和电感，在本实施中，该电容值为0.7 pF，电感值为3nH。所述第四匹配元件920为电感，在本实施例中，该电感值为3nH。在本实施例中，第四天线各个工作频段的回波损耗和效率如图10和图11所示。
本发明的天线系统100通过调节各调谐开关和可变电容以实现LTE不同频带的实施例如下：
Figure dest_path_image001
具体地：
1）在所述天线系统工作于LTE700T（699-746 MHz）时，所述第一辐射部通过1.5nH的电感与所述第二接地点电连接，所述第一辐射部通过1.5pF的电容与所述第一接地点电连接，所述第三辐射部通过1.3pF的可变电容与所述第三馈电点电连接，所述第三辐射部与所述第四接地点电隔离，所述第三辐射部通过0.3pF的电容与所述第三接地点电连接；
2）在所述天线系统工作于LTE700R（746-803MHz）时，所述第一辐射部通过1.5nH的电感与所述第二接地点电连接，所述第一辐射部通过1.5pF的电容与所述第一接地点电连接，所述第三辐射部通过电容值为1.1pF的可变电容与所述第三馈电点电连接，所述第三辐射部与所述第四接地点电隔离，所述第三辐射部通过0.3pF的电容与所述第三接地点电连接。
3）在所述天线系统工作于LTE800（791-862MHz）时，所述第一辐射部通过2.2nH的电感与所述第二接地点电连接，所述第一辐射部通过0.8pF的电容与所述第一接地点电连接，所述第三辐射部通过0.95pF的可变电容与所述第三馈电点电连接，所述第三辐射部与所述第四接地点电隔离，所述第三辐射部与所述第三接地点电隔离。
4）在所述天线系统工作于LTE850（824-894MHz）时，所述第一辐射部通过5nH的电感与所述第二接地点电连接，所述第一辐射部与所述第一接地点电隔离，所述第三辐射部通过0.9pF的可变电容与所述第三馈电点电连接，所述第三辐射部通过16nH的电感与所述第四接地点电连接，所述第三辐射部与所述第三接地点电隔离。
5）在所述天线系统工作于LTE900（880-960MHz）时，所述第一辐射部通过5nH的电感与所述第二接地点电连接，所述第一辐射部通与所述第一接地点电隔离，所述第三辐射部通过0.9pF的可变电容与所述第三馈电点电连接，所述第三辐射部通过0欧姆电阻与所述第四接地点电连接，所述第三辐射部与所述第三接地点电隔离。
6）在所述天线系统工作于LTE中、高频（1710~2690MHz）时，所述第一辐射部与所述第二接地点电隔离，所述第一辐射部与所述第一接地点电隔离，所述第三辐射部通过电容值为1.8pF的可变电容与所述第三馈电点电连接，所述第三辐射部通过0欧姆电阻与所述第四接地点电连接，所述第三辐射部通过电感值为1.2nH的电感与所述第三接地点电连接。
请结合参阅图12和图13，为本发明提供的天线系统的天线间的隔离度仿真曲线图。
综上可知所述天线系统100，通过所述第一馈电点馈电形成了第一天线，通过所述第二馈电点馈电形成了第二天线，通过所述第三馈电点馈电形成了第三天线，通过所述第四馈电点馈电形成了第四天线。所述第一天线和所述第三天线的工作频率均可覆盖LTE低频，具体频段为699~960MHz，其协同工作构成工作于LTE低频的2×2MIMO机制；所述第一天线、所述第二天线、所述第三天线和所述第四天线的工作频率均可覆盖LTE中、高频，具体频段为1710~2690MHz，其协同工作构成工作于LTE中、高频的4×4MIMO机制；所述第四天线的工作频率可覆盖Wi-Fi2.4G、Wi-Fi5G，具体频段为2400~2500MHz和5150~5850MHz。
在本实施方式中，第一天线作为LTE主天线工作，第三天线作为LTE分集天线工作。所述第四天线的工作频率还可覆盖GNSS主流频段。
本发明还提供一种移动终端，所述移动终端包括上文所述的天线系统的技术特征，当然应用该天线系统也同样具有上述技术效果。所述移动终端的尺寸为80mm×160mm，3D玻璃屏。
相较于相关技术，本发明提供的天线系统，底部边框由所述断口分隔成第一辐射部和第二辐射部，顶部边框由所述第二连接筋和所述顶部边框连接点分隔成的第三辐射部和第四辐射部，所述第一馈电点与所述第一辐射部电连接，所述第二接地点通过第一调谐开关与所述第一辐射部电连接，所述第一接地点通过第二调谐开关与第所述第一辐射部电连接，构成第一天线；所述第二馈电点通过第一匹配网络与所述第二辐射部电连接，所述第二辐射部通过所述第一连接筋接地，构成第二天线；所述第三馈电点通过可变电容（Tunner）与所述第三辐射部电连接，所述第四接地点通过第三调谐开关与所述第三辐射部电连接，所述第三接地点通过第四调谐开关与所述第三辐射部电连接，所述第三辐射部通过所述第二连接筋接地，构成第三天线；所述第四馈电点通过第二匹配网络与所述第四辐射部电连接，所述第四辐射部通过所述第二连接筋接地，构成第四天线；从而使得所述天线系统实现LTE低频的2×2MIMO机制和LTE中、高频的4×4MIMO机制，覆盖Wi-Fi2.4G、Wi-Fi5G的工作频率，并同时支持GNSS所述主流频段，多频多模、多频段载波聚合，通讯性能更优。并且，天线系统内的天线布置于终端的上下左右，横竖屏均能保证信号接入强度。
以上所述的仅是本发明的实施方式，在此应当指出，对于本领域的普通技术人员来说，在不脱离本发明创造构思的前提下，还可以做出改进，但这些均属于本发明的保护范围。

Claims (10)

  1. 一种天线系统，包括金属边框及收容于所述金属边框内的主板，所述金属边框包括环绕所述主板且分别与所述主板形成净空区域的底部边框和顶部边框、连接所述底部边框与所述主板的第一连接筋及连接所述顶部边框与所述主板的第二连接筋，所述顶部边框和所述底部边框相对间隔设置，其特征在于，所述底部边框包括断口及分设于其两端的第一缝隙和第二缝隙，所述顶部边框包括与所述第二缝隙位于同一侧且相对设置的第三缝隙、与所述第一缝隙位于同一侧且相对设置的第四缝隙及自所述第四缝隙靠近所述底部边框的一端向所述底部边框方向延伸的延伸部，所述底部边框上从所述断口延伸至所述第一缝隙的部位为第一辐射部，所述底部边框上从所述断口延伸至所述第二缝隙的部位为第二辐射部，所述顶部边框上从所述第二连接筋延伸至所述第三缝隙的部位为第三辐射部，所述顶部边框上从所述第二连接筋延伸至所述延伸部的部位为第四辐射部，所述主板包括靠近所述底部边框的第一主板及靠近所述顶部边框的第二主板，所述天线系统还包括设于所述第一主板的第一馈电点、第二馈电点、第一接地点、第二接地点、第一调谐开关、第二调谐开关和第一匹配网络、设于所述第二主板的第三馈电点、第四馈电点、第三接地点、第四接地点、可变电容、第三调谐开关、第四调谐开关和所述第二匹配网络；其中，
    所述第一馈电点与所述第一辐射部电连接，所述第二接地点通过所述第一调谐开关与所述第一辐射部电连接，所述第一接地点通过所述第二调谐开关与第所述第一辐射部电连接；
    所述第二馈电点通过所述第一匹配网络与所述第二辐射部电连接，所述第二辐射部通过所述第一连接筋接地；
    所述第三馈电点通过所述可变电容与所述第三辐射部电连接，所述第四接地点通过所述第三调谐开关与所述第三辐射部电连接，所述第三接地点通过所述第四调谐开关与所述第三辐射部电连接；
    所述第四馈电点通过所述第二匹配网络与所述第四辐射部电连接；
    所述第三辐射部和所述第四辐射部通过所述第二连接筋接地。
  2. 根据权利要求1所述的天线系统，其特征在于，通过所述第一馈电点馈电以形成第一天线，通过所述第二馈电点馈电以形成第二天线，通过所述第三馈电点馈电以形成第三天线，通过所述第四馈电点馈电以形成第四天线，所述第一天线和所述第三天线的工作频率均可覆盖LTE低频，并协同工作构成工作于LTE低频的2×2MIMO机制；所述第一天线、所述第二天线、所述第三天线和所述第四天线的工作频率均可覆盖LTE中、高频，并协同工作构成工作于LTE中、高频的4×4MIMO机制；所述第四天线的工作频率可覆盖Wi-Fi2.4G、Wi-Fi5G和GNSS主流频段。
  3. 根据权利要求1所述的天线系统，其特征在于，所述第一调谐开关设有第一电感接入状态、第二电感接入状态、第三电感接入状态和断路状态，当所述第一调谐开关在不同工作状态时，所述第一辐射部通过第一电感、第二电感和第三电感中的一个与所述第二接地点连接或者与所述第二接地点电隔离；
    所述第二调谐开关设有第一电容接入状态、第二电容接入状态或断路状态，当所述第二调谐开关在不同工作状态时，所述第一辐射部通过第一电容和第二电容中的一个与所述第一接地点连接或者与所述第一接地点隔离；
    所述第三调谐开关设有第四电感接入状态、断路状态和短路状态，当所述第三调谐开关在不同工作状态时，所述第三辐射部通过第四电感或者0欧姆电阻与所述第四接地点连接或者与所述第四接地点隔离；
    所述第四调谐开关设有第五电感接入状态、第三电容接入状态和断路状态，当所述第四调谐开关在不同工作状态时，所述第三辐射部通过第五电感和第三电容中的一个与所述第三接地点连接或者与所述第三接地点隔离。
  4. 根据权利要求1所述的天线系统，其特征在于，所述第一匹配网络包括一端与所述第二辐射部连接且另一端与所述第二馈电点连接的第一匹配元件及一端与所述第二辐射部连接且另一端接地的第二匹配元件，所述第一匹配元件为电容，所述第二匹配元件包括并联连接的电容和电感。
  5. 根据权利要求1所述的天线系统，其特征在于，所述第二匹配网络包括一端与所述第四辐射部连接且另一端与所述第四馈电点连接的第三匹配元件及一端与所述第四辐射部连接且另一端接地的第四匹配元件，所述第三匹配元件包括串联连接的电容和电感，所述第四匹配元件为电感。
  6. 根据权利要求1至5任一项所述的天线系统，其特征在于，所述金属边框还包括两端分别与所述底部边框和所述顶部边框连接的中部边框，所述底部边框还包括第一主边框及自所述第一主边框的两端向靠近所述顶部边框方向弯折延伸的两个第一侧边框，两个所述第一侧边框与所述中部边框间隔设置分别形成所述第一缝隙和所述第二缝隙。
  7. 根据权利要求6所述的天线系统，其特征在于，所述第二接地点临近所述断口设置，所述第一馈电点位于所述第一接地点和所述第二接地点之间且临近所述第二接地点设置，所述第二馈电点位于所述第二缝隙和所述断口之间且临近所述断口设置，所述第一连接筋与所述第二辐射部连接且临近所述断口设置。
  8. 根据权利要求6所述的天线系统，其特征在于，所述顶部边框还包括与所述第一主边框正对设置的第二主边框及自所述第二主边框的两端分别向靠近所述底部边框方向弯折延伸的两个第二侧边框，其中一个所述第二侧边框与所述中部边框间隔设置形成所述第三缝隙，另一个所述第二侧边框与所述延伸部间隔设置形成所述第四缝隙，所述延伸部与所述中部边框连接。
  9. 根据权利要求8所述的天线系统，其特征在于，所述第四馈电点位于所述第二连接筋和所述第四缝隙之间，所述第二连接筋位于所述第四馈电点和所述第四接地点之间且临近所述第四接地点设置，所述第三接地点位于所述第四接地点和所述第三馈电点之间且临近所述第三馈电点设置。
  10. 一种移动终端，所述移动终端包括权利要求1至9任一项所述的天线系统。
PCT/CN2019/087527 2018-08-03 2019-05-20 天线系统及移动终端 WO2020024659A1 (zh)

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