WO2020134367A1 - 一种天线系统及移动终端 - Google Patents

一种天线系统及移动终端 Download PDF

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Publication number
WO2020134367A1
WO2020134367A1 PCT/CN2019/111025 CN2019111025W WO2020134367A1 WO 2020134367 A1 WO2020134367 A1 WO 2020134367A1 CN 2019111025 W CN2019111025 W CN 2019111025W WO 2020134367 A1 WO2020134367 A1 WO 2020134367A1
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Prior art keywords
switch
antenna system
impedance element
tuning capacitor
frame
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PCT/CN2019/111025
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English (en)
French (fr)
Inventor
邱孝钧
朱博
Original Assignee
瑞声声学科技(深圳)有限公司
瑞声科技(新加坡)有限公司
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Publication of WO2020134367A1 publication Critical patent/WO2020134367A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H04B1/0458—Arrangements for matching and coupling between power amplifier and antenna or between amplifying stages
    • 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
    • H01Q5/335—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 at the feed, e.g. for impedance matching
    • 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
    • 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
    • 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
    • H01Q1/44—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
    • H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/10—Resonant slot antennas
    • 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
    • H01Q5/20—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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
    • H04B1/0053—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band
    • H04B1/006—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band using switches for selecting the desired band
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/18—Input circuits, e.g. for coupling to an antenna or a transmission line
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
    • H04M1/026—Details of the structure or mounting of specific components

Definitions

  • Embodiments of the present application relate to the field of communications, and in particular, to an antenna system and mobile terminal.
  • the purpose of the embodiments of the present application is to provide an antenna system and a mobile terminal, so that the mobile terminal can tune the frequency bandwidth of the antenna and have a wider high-frequency bandwidth when there is little antenna clearance.
  • the embodiments of the present application provide an antenna system, which is applied to a mobile terminal.
  • the mobile terminal includes a metal frame and a system ground housed in the metal frame.
  • the metal frame includes a first short axis connected end to end.
  • the antenna system includes: the front frame rib connecting the system ground and the first short-axis frame, the broken seam opened on the first long-axis frame, the RF front-end area opened on the system ground, and the The RF front-end area is connected to the first frame point and the second frame point of the metal frame.
  • the first frame point and the second frame point are located between the rib position and the break of the front frame.
  • the RF front-end area is provided with a feed Point, matching circuit, impedance tuning circuit and switch circuit; the feeding point is electrically connected to the first frame point through the series matching circuit and impedance tuning circuit, and the second frame point is electrically connected to the system ground through the switch circuit, by adjusting the impedance
  • the tuning circuit and the switching circuit switch the working state of the antenna system to work in different frequency bands.
  • the antenna system includes a working state. In the working state, the antenna system works at 1710-2700MHz.
  • the embodiments of the present application also provide a mobile terminal, including the antenna system as mentioned in the above embodiments.
  • the embodiment of the present application through the cooperation of the impedance matching circuit and the switch circuit, enables the antenna system to work in more frequency bands, and can guarantee the performance of each frequency band, thereby enabling the antenna system to cover 1710-2700 Hz Various carrier aggregation states.
  • the impedance tuning circuit includes a first switch, a second switch, a first tuning capacitor, and a second tuning capacitor; the first end of the first tuning capacitor, the first end of the second switch, and the first end of the second tuning capacitor are connected , A node between the first end of the first tuning capacitor, the first end of the second switch, and the first end of the second tuning capacitor serves as an input end of the impedance tuning circuit, and the second end of the first tuning capacitor and the first switch Is connected to the first end, the second end of the first switch is connected to the second end of the second switch, and the node between the second end of the first switch and the second end of the second switch serves as the output end of the impedance tuning circuit, The second terminal of the second tuning capacitor is grounded.
  • the matching circuit includes a first impedance element, a second impedance element, a third impedance element, and a fourth impedance element; the first end of the first impedance element serves as the input end of the matching circuit, and the second end of the first impedance element, the first The first end of the second impedance element is connected to the first end of the third impedance element, the second end of the second impedance element is connected to the first end of the fourth impedance element, and the second end of the third impedance element and the fourth impedance element The second terminal is grounded.
  • the switch circuit includes a third switch, a fourth switch, a fifth switch, a sixth switch, a fifth impedance element, a sixth impedance element, a seventh impedance element, an eighth impedance element, and a ninth impedance element;
  • the first end is grounded through the fifth impedance element
  • the first end of the fourth switch is grounded through the sixth impedance element
  • the fifth switch is grounded through the seventh impedance element
  • the sixth switch is grounded through the eighth impedance element
  • the second Terminal, the second terminal of the fourth switch, the second terminal of the fifth switch and the second terminal of the sixth switch are connected, the second terminal of the third switch, the second terminal of the fourth switch, the second terminal of the fifth switch
  • the node between the second terminal of the sixth switch is connected to the second frame point, the second terminal of the third switch, the second terminal of the fourth switch, the second terminal of the fifth switch and the second terminal of the sixth switch
  • the node between the terminals is grounded through the ninth impedance element.
  • the first impedance element is a first resistor
  • the second impedance element is a first inductor
  • the third impedance element is a second resistor
  • the fourth impedance element is a second inductor
  • the fifth impedance element is a third inductor
  • the sixth impedance The element is a first capacitor
  • the seventh impedance element is a second capacitor
  • the eighth impedance element is a fourth inductor.
  • the inductance value of the third inductor is 10 nH
  • the inductance value of the fourth inductor is 1.8 nH
  • the capacitance value of the first capacitor is 10 pF
  • the capacitance value of the second capacitor is 2.7 pF.
  • the capacitance value of the first tuning capacitor is 0.65 pF
  • the capacitance value of the second tuning capacitor is 0.4
  • the capacitance value of the first tuning capacitor is 0.87 pF
  • the capacitance value of the second tuning capacitor is 0.4pF
  • the working frequency band of the antenna system covers 880MHz-935MHz
  • the first switch, the third switch and the fourth switch are closed, the second switch, the fifth switch and the sixth switch are open
  • the capacitance value of the first tuning capacitor is 1.1pF
  • the capacitance value of the second tuning capacitor is 0.4pF
  • the operating frequency band covers 791MHz-842MHz; when the first switch is closed, the second switch, the third switch, the fourth switch, the fifth switch and the sixth switch are opened, the capacitance value of the first tuning capacitor is 1.1pF, the second tuning capacitor When the capacitance value is 0.4pF, the working frequency band of the antenna system covers 738MHz-803MHz; when the first switch is closed, the second switch, third switch, fourth switch, fifth switch and sixth switch are opened, the first tuning capacitor When the capacitance of the second tuning capacitor is 1.32pF and the capacitance of the second tuning capacitor is 0.4pF, the working frequency band of the antenna system covers 703MHz-768MHz; when the second switch and the third switch are closed, the first switch, the fourth switch, and the fifth switch When it is disconnected from the sixth switch, and the capacitance value of the second tuning capacitor is 0.4pF, the working frequency band of the antenna system covers 1710MHz-2170MHz; when the third switch and the sixth switch are closed, the first switch, the second switch, and the fourth switch When
  • the distance between the RF front-end region and the first short-axis frame is 1.5 mm
  • the distance between the RF front-end region and the first long-axis frame Is 1mm
  • the vertical distance from the front frame rib position to the first long axis frame is 41.33mm.
  • a broken seam is formed on the first long-axis frame, and the vertical distance between the broken seam and the first short-axis frame is 14 mm, and the width of the broken seam is 1.8 mm.
  • FIG. 1 is a schematic structural diagram of a mobile terminal according to the first embodiment of the present application.
  • FIG. 2 is a schematic structural diagram of an antenna system according to a first embodiment of this application.
  • FIG. 3 is a circuit circuit diagram of an impedance tuning circuit of the antenna system of the first embodiment of the present application.
  • FIG. 4 is a circuit schematic diagram of the matching circuit of the antenna system of the first embodiment of the present application.
  • FIG. 5 is a schematic diagram of the connection of the feeding point, the matching circuit, the impedance tuning circuit, and the first frame point of the antenna system according to the first embodiment of the present application;
  • FIG. 6 is a circuit diagram of a switching circuit of the antenna system of the first embodiment of the present application.
  • FIG. 7 is a schematic diagram of the connection between the switch circuit and the second frame point of the first embodiment of the present application.
  • connection and “connection” in this application, unless otherwise specified, include direct and indirect connection (connection).
  • the first embodiment of the present application relates to an antenna system applied to a mobile terminal.
  • the mobile terminal includes a metal frame and a system ground 101 housed in the metal frame.
  • the metal frame includes a first short-axis frame 102 and a A long-axis frame 103, a second short-axis frame 104, and a second long-axis frame 105, in the direction along the first long-axis frame 103, the distance between the system 101 and the first short-axis frame 102 is not more than 1.5mm, the system The distance between the ground 101 and the first long-axis frame 103 is not more than 1 mm;
  • the antenna system includes: a front frame rib 1021 connecting the system ground 101 and the first short-axis frame 102, a break 109 opened on the first long-axis frame, and an opening
  • the RF front-end area 106 at the system ground 101 and the first and second frame points 107 and 108 connected to the metal frame from the RF front-end area 106 are located in the front
  • the antenna system includes a working state in which the antenna system works at 1710-2700MHz.
  • the impedance tuning circuit shown in FIG. 3 includes a first switch S1, a second switch S2, a first tuning capacitor PAC1, and a second tuning capacitor PAC2; the first end of the first tuning capacitor PAC1, the second switch The first end of S2 is connected to the first end of the second tuning capacitor PAC2, and the node between the first end of the first tuning capacitor PAC1, the first end of the second switch S2 and the first end of the second tuning capacitor PAC2 serves as The input terminal of the impedance tuning circuit, the second terminal of the first tuning capacitor PAC1 is connected to the first terminal of the first switch S1, the second terminal of the first switch S1 is connected to the second terminal of the second switch S2, and the first switch S1 The node between the second terminal of the second terminal and the second terminal of the second switch S2 serves as the output terminal of the impedance tuning circuit, and the second terminal of the second tuning capacitor PAC2 is grounded.
  • the impedance tuning circuit may be implemented by an adjustable chip, for example, a chip model QM13011.
  • the matching circuit shown in FIG. 4 includes: the matching circuit includes a first impedance element G1, a second impedance element G2, a third impedance element G3, and a fourth impedance element G4; the first of the first impedance element G1 The terminal serves as the input terminal of the matching circuit, the second terminal of the first impedance element G1, the first terminal of the second impedance element G2 and the first terminal of the third impedance element G3 are connected, and the second terminal of the second impedance element G2 is connected to the first The first end of the four impedance element G4 is connected, and the second end of the third impedance element G3 and the second end of the fourth impedance element G4 are grounded.
  • the connection diagram of the feeding point, the matching circuit, the impedance tuning circuit and the first frame point is shown in FIG. 5.
  • the first impedance element is a first resistor
  • the second impedance element is a first inductor
  • the third impedance element is a second resistor
  • the fourth impedance element is a second inductor
  • the resistance value of the first resistor is 0 ohm
  • the inductance value of the first inductor is 1.5 nH
  • the resistance value of the second resistor is 0.2 ohm
  • the inductance value of the second inductor is 8 nH.
  • each impedance element in the matching circuit can be set according to the frequency band to be covered.
  • the switch circuit is shown in FIG. 6 and includes: a third switch S3, a fourth switch S4, a fifth switch S5, a sixth switch S6, a fifth impedance element G5, a sixth impedance element G6, and a seventh impedance Element G7, the eighth impedance element G8 and the ninth impedance element G9; the first end of the third switch S3 is grounded through the fifth impedance element G5, the first end of the fourth switch S4 is grounded through the sixth impedance element G6, the fifth switch S5 is grounded through the seventh impedance element G7, the sixth switch S6 is grounded through the eighth impedance element G8, the second terminal of the third switch S3, the second terminal of the fourth switch S4, the second terminal of the fifth switch S5 and the sixth The second end of the switch S6 is connected, the node between the second end of the third switch S3, the second end of the fourth switch S4, the second end of the fifth switch S5 and the second end of the sixth switch S6 is connected to the second Connected to the frame point
  • the switch circuit may be implemented by a switch control chip (such as a chip model QM13126, or a chip model QM1313).
  • a switch control chip such as a chip model QM13126, or a chip model QM1313
  • FIG. 7 RF1 is a pin connected to the third switch S3, RF2 is a pin connected to the fourth switch S4, RF3 is a pin connected to the fifth switch S5, and RF4 is a pin connected to the switch S6.
  • RFC is the output pin
  • GND is the ground pin
  • VDD is the power pin
  • SDATA is the data input pin, SCLK is the system clock pin,
  • VIO is the data input and output power pin, and ID0 is the data input pin.
  • the fifth impedance element is a third inductor
  • the sixth impedance element is a first capacitor
  • the seventh impedance element is a second capacitor
  • the eighth impedance element is a fourth inductor.
  • the third inductor has a value of 10 nH
  • the fourth inductor has a value of 1.8 nH
  • the first capacitor has a value of 10 pF
  • the second capacitor has a value of 2.7 pF.
  • connection diagram of the feed point, the matching circuit, the impedance tuning circuit, and the first frame point is shown in FIG. 5, and the connection diagram of the switch circuit and the second frame point is shown in FIG. 7.
  • the antenna frequency band table is shown in Table 1, and the efficiency diagram of the antenna system in each frequency band is shown in FIGS. 8 to 10.
  • SW represents the switch circuit
  • NA represents unavailable, that is, after adjusting PAC1, it does not affect the operating frequency band of the antenna system.
  • the capacitance value of the first tuning capacitor PAC1 is 0.87pF
  • the second tuning capacitor When the capacitance value of PAC2 is 0.4pF, the working frequency band of the antenna system covers 880MHz-935MHz. In this working state, the efficiency of the antenna system is shown as curve 2 in FIG. 8.
  • the capacitance value of the first tuning capacitor PAC1 is 1.1 pF
  • the second tuning capacitor When the capacitance value of PAC2 is 0.4pF, the working frequency band of the antenna system covers 839MHz-894MHz. In this working state, the efficiency of the antenna system is shown as curve 3 in FIG. 8.
  • the capacitance value of the first tuning capacitor PAC1 is 1.07 pF
  • the second tuning capacitor When the capacitance value of PAC2 is 0.4pF, the working frequency band of the antenna system covers 811MHz-879MHz. In this working state, the efficiency of the antenna system is shown as curve 4 in FIG. 9.
  • the capacitance value of the first tuning capacitor PAC1 is 0.87pF
  • the second tuning capacitor When the capacitance value of PAC2 is 0.4pF, the working frequency band of the antenna system covers 791MHz-842MHz. In this working state, the efficiency of the antenna system is shown as curve 5 in FIG. 9.
  • the capacitance value of the first tuning capacitor PAC1 is 1.1 pF
  • the second tuning capacitor When the capacitance value of PAC2 is 0.4pF, the working frequency band of the antenna system covers 738MHz-803MHz. In this working state, the efficiency of the antenna system is shown as curve 6 in FIG. 9.
  • the capacitance value of the first tuning capacitor PAC1 is 1.32pF
  • the second tuning capacitor When the capacitance value of PAC2 is 0.4pF, the working frequency band of the antenna system covers 703MHz-768MHz. In this working state, the efficiency of the antenna system is shown as curve 7 in FIG.
  • the second switch S2 and the third switch S3 are closed, the first switch S1, the fourth switch S4, the fifth switch S5, and the sixth switch S6 are opened, and the capacitance value of the second tuning capacitor PAC2 is 0.4 pF
  • the antenna system The working frequency band covers 1710MHz-2170MHz.
  • the efficiency of the antenna system is shown as curve 8 in FIG. 10.
  • the third switch S3 and the sixth switch S6 are closed, the first switch S1, the second switch S2, the fourth switch S4 and the fifth switch S5 are opened, and the capacitance value of the second tuning capacitor PAC2 is 2.08 pF, the The working frequency band covers 2300MHz-2700MHz.
  • the efficiency of the antenna system is shown as curve 9 in FIG.
  • the third switch S3 and the sixth switch 6 are closed, the first switch S1, the second switch S2, the fourth switch S4 and the fifth switch S5 are opened, and the capacitance value of the second tuning capacitor PAC2 is 0.64pF, the The working frequency band covers 1710MHz-2700MHz.
  • the efficiency of the antenna system is shown as curve 10 in FIG. 10.
  • the operating frequency band of the antenna can be switched by adjusting the state of each switch in the switch circuit.
  • the switching state of the first switch, the switching state of the second switch, the capacitance value of the first tuning capacitor and the capacitance value of the second tuning capacitor, the value between the feed point and the frame point can be changed
  • the circuit structure allows the antenna system to cover various carrier aggregation states of 1710-2700Hz under the premise of covering various frequency bands in 1710-2700Hz, as well as the performance of the antenna system in each working frequency band.
  • FDD Frequency Division Duplexing
  • the distance between the RF front-end region 106 and the first short-axis frame 102 is 1.5 mm, and in the direction along the first short-axis frame 102, the RF front-end region 106
  • the distance from the first long-axis frame 103 is 1 mm, and the vertical distance from the front frame rib 1021 to the first long-axis frame 103 is 41.33 mm.
  • the vertical distance between the broken seam 109 and the first short-axis frame 102 is 14 mm, and the width of the broken seam 109 is 1.8 mm.
  • the antenna system provided in this embodiment through the cooperation of the impedance matching circuit and the switch circuit, enables the antenna system to work in more frequency bands, and can ensure the performance of each frequency band, so that the antenna system can meet the coverage Various carrier aggregation states of 1710-2700Hz.
  • the second embodiment of the present application provides a mobile terminal including the antenna system provided in the first embodiment described above.
  • the mobile terminal is particularly suitable for full-screen electronic devices.
  • the mobile terminal should also include hardware such as a processor and a memory, where the memory and the processor are connected by a bus.
  • the bus may include any number of interconnected buses and bridges.
  • the bus connects each of one or more processors and the memory. Kinds of circuits are linked together.
  • the bus can also link various other circuits such as peripheral devices, voltage regulators, and power management circuits, etc., which are well known in the art, and therefore, they will not be described further herein.
  • the bus interface provides an interface between the bus and the antenna system.
  • the data processed by the processor is transmitted on the wireless medium through the antenna system. Further, the antenna system also receives the data and transmits the data to the processor.
  • the processor is responsible for managing the bus and general processing, and can also provide various functions, including timing, peripheral interfaces, voltage regulation, power management, and other control functions.
  • the memory can be used to store data used by the processor when performing operations.

Abstract

本申请实施例涉及通信领域，公开了一种天线系统及移动终端。本申请中，天线系统包括：连接系统地和第一短轴边框的前框筋位、开设于第一长轴边框的断缝、开设于系统地的射频前端区和自射频前端区连接至金属边框的第一接框点和第二接框点，第一接框点和第二接框点位于前框筋位和断缝之间，射频前端区上设置有馈电点、匹配电路、阻抗调谐电路和开关电路；通过调节阻抗调谐电路和开关电路，切换天线系统的工作状态以工作于不同的频段，天线系统包括一种工作状态，在工作状态中，天线系统工作于1710-2700MHz。该实现中，天线系统能够在天线净空区很少的情况下，工作于不同的频段。

Description

一种天线系统及移动终端 技术领域
本申请实施例涉及通信领域，特别涉及一种天线系统及移动终端。
背景技术
由于缝隙天线体积小、重量轻，易于实现与设备的共形设计，缝隙天线被广泛应用在手机上。而随着手持通讯产品不断的发展，越来越多的新技术、新工艺被应用到电子装置的研发里来。近些年由于对整机质感要求提高，屏幕的屏占比越来越高。
然而，发明人发现现有技术中至少存在如下问题：目前，很多金属缝隙天线的设计都是馈电点串联可调电容加上地点开关。然而，在全面屏的环境下，天线的净空区很小，天线的阻抗带宽不足，天线史密斯圆不好匹配，设计的过程中往往无法同时顾及天线的低频性能、中频性能和中高频性能。
发明内容
本申请实施方式的目的在于提供一种天线系统及移动终端，使得移动终端能够在天线净空区很少的情况下，调谐天线的频宽，并且具有更宽的高频带宽。
为解决上述技术问题，本申请的实施方式提供了一种天线系统，应用于移动终端，移动终端包括金属边框和收容于金属边框内的系统地，金属边框包括依次首尾相接的第一短轴边框、第一长轴边框、第二短轴边框和第二长轴边框，在沿第一长轴边框的方向上，系统地与第一短轴边框的距离不大于1.5mm，系统地与第一长轴边框的距离不大于1mm；天线系统包括：连接系统地和第一短轴边框的前框筋位、开设于第一长轴边框的断缝、开设于系统地的射频前端区和自射频前端区连接至金属边框的第一接框点和第二接框点，第一接框点和第二接框点位于前框筋位和断缝之间，射频前端区上设置有馈电点、匹配电路、阻抗调谐电路和开关电路；馈电点通过串联的匹配电路和阻抗调谐电路与第一接框点电连接，第二接框点通过开关电路电连接至系统地，通过调节阻抗调谐电路和开关电路，切换天线系统的工作状态以工作于不同的频段，天线系统包括一种工作状态，在工作状态中，天线系统工作于1710-2700MHz。
本申请的实施方式还提供了一种移动终端，包括如上述实施方式提及的天线系统。
本申请实施方式相对于现有技术而言，通过阻抗匹配电路和开关电路配合，使得天线系统能够工作于更多频段，并且能够保证每个频段的性能，进而使得天线系统能够覆盖1710-2700Hz的各种载波聚合状态。
另外，阻抗调谐电路包括第一开关、第二开关、第一调谐电容器和第二调谐电容器；第一调谐电容器的第一端、第二开关的第一端和第二调谐电容器的第一端连接，第一调谐电容器的第一端、第二开关的第一端和第二调谐电容器的第一端之间的节点作为阻抗调谐电路的输入端，第一调谐电容器的第二端与第一开关的第一端连接，第一开关的第二端与第二开关的第二端连接，第一开关的第二端与第二开关的第二端之间的节点作为阻抗调谐电路的输出端，第二调谐电容器的第二端接地。
另外，匹配电路包括第一阻抗元件、第二阻抗元件、第三阻抗元件和第四阻抗元件；第一阻抗元件的第一端作为匹配电路的输入端，第一阻抗元件的第二端、第二阻抗元件的第一端和第三阻抗元件的第一端连接，第二阻抗元件的第二端与第四阻抗元件的第一端连接，第三阻抗元件的第二端和第四阻抗元件的第二端接地。
另外，开关电路包括第三开关、第四开关、第五开关、第六开关、第五阻抗元件、第六阻抗元件、第七阻抗元件、第八阻抗元件和第九阻抗元件；第三开关的第一端通过第五阻抗元件接地，第四开关的第一端通过第六阻抗元件接地，第五开关通过第七阻抗元件接地，第六开关通过第八阻抗元件接地，第三开关的第二端、第四开关的第二端、第五开关的第二端和第六开关的第二端连接，第三开关的第二端、第四开关的第二端、第五开关的第二端和第六开关的第二端之间的节点与第二接框点连接，第三开关的第二端、第四开关的第二端、第五开关的第二端和第六开关的第二端之间的节点通过第九阻抗元件接地。
另外，第一阻抗元件为第一电阻，第二阻抗元件为第一电感，第三阻抗元件为第二电阻，第四阻抗元件为第二电感，第五阻抗元件为第三电感，第六阻抗元件为第一电容，第七阻抗元件为第二电容，第八阻抗元件为第四电感。
另外，第三电感的电感值为10nH，第四电感的电感值为1.8nH，第一电容的电容值为10pF，第二电容的电容值为2.7pF。
另外，当第一开关、第三开关和第四开关闭合，第二开关、第五开关和第六开关断开，第一调谐电容器的电容值为0.65pF，第二调谐电容器的电容值为0.4pF时，天线系统的工作频段覆盖905MHz-960MHz；当第一开关、第三开关和第四开关闭合，第二开关、第五开关和第六开关断开，第一调谐电容器的电容值为0.87pF，第二调谐电容器的电容值为0.4pF时，天线系统的工作频段覆盖880MHz-935MHz；当第一开关、第三开关和第四开关闭合，第二 开关、第五开关和第六开关断开，第一调谐电容器的电容值为1.1pF，第二调谐电容器的电容值为0.4pF时，天线系统的工作频段覆盖839MHz-894MHz；当第一开关、第三开关和第五开关闭合，第二开关、第四开关和第六开关断开，第一调谐电容器的电容值为1.07pF，第二调谐电容的电容值为0.4pF时，天线系统的工作频段覆盖811MHz-879MHz；当第一开关闭合，第二开关、第三开关、第四开关、第五开关和第六开关断开，第一调谐电容器的电容值为0.87pF，第二调谐电容的电容值为0.4pF时，天线系统的工作频段覆盖791MHz-842MHz；当第一开关闭合，第二开关、第三开关、第四开关、第五开关和第六开关断开，第一调谐电容器的电容值为1.1pF，第二调谐电容的电容值为0.4pF时，天线系统的工作频段覆盖738MHz-803MHz；当第一开关闭合，第二开关、第三开关、第四开关、第五开关和第六开关断开，第一调谐电容器的电容值为1.32pF，第二调谐电容的电容值为0.4pF时，天线系统的工作频段覆盖703MHz-768MHz；当第二开关和第三开关闭合，第一开关、第四开关、第五开关和第六开关断开，第二调谐电容器的电容值为0.4pF时，天线系统的工作频段覆盖1710MHz-2170MHz；当第三开关和第六开关闭合，第一开关、第二开关、第四开关和第五开关断开，第二调谐电容器的电容值为2.08pF时，天线系统的工作频段覆盖2300MHz-2700MHz；当第三开关和第六开关闭合，第一开关、第二开关、第四开关和第五开关断开，第二调谐电容器的电容值为0.64pF时，天线系统的工作频段覆盖1710MHz-2700MHz。
另外，在沿第一长轴边框的方向上，射频前端区与第一短轴边框的距离为1.5mm，在沿第一短轴边框的方向上，射频前端区与第一长轴边框的距离为1mm，前框筋位到第一长轴边框的垂直距离为41.33mm。
另外，在第一长轴边框上开设有断缝，断缝与第一短轴边框的垂直距离为14mm，断缝的宽度为1.8mm。
附图说明
一个或多个实施例通过与之对应的附图中的图片进行示例性说明，这些示例性说明并不构成对实施例的限定，附图中具有相同参考数字标号的元件表示为类似的元件，除非有特别申明，附图中的图不构成比例限制。
图1是本申请的第一实施方式的移动终端的结构示意图；
图2是本申请的第一实施方式的天线系统的结构示意图；
图3是本申请的第一实施方式的天线系统的阻抗调谐电路的电路电路图；
图4是本申请的第一实施方式的天线系统的匹配电路的电路示意图；
图5是本申请的第一实施方式的天线系统的馈电点、匹配电路、阻抗调谐电路和第一接框点的连接示意图；
图6是本申请的第一实施方式的天线系统的开关电路的电路图；
图7是本申请的第一实施方式的开关电路与第二接框点的连接示意图；
图8至图10是本申请的第一实施方式的天线系统的效率图。
具体实施方式
为使本申请实施例的目的、技术方案和优点更加清楚，下面将结合附图对本申请的各实施方式进行详细的阐述。然而，本领域的普通技术人员可以理解，在本申请各实施方式中，为了使读者更好地理解本申请而提出了许多技术细节。但是，即使没有这些技术细节和基于以下各实施方式的种种变化和修改，也可以实现本申请所要求保护的技术方案。
本文中为部件所编序号本身，例如“第一”、“第二”等，仅用于区分所描述的对象，不具有任何顺序或技术含义。而本申请所说“连接”、“联接”，如无特别说明，均包括直接和间接连接(联接)。
本申请的第一实施方式涉及一种天线系统，应用于移动终端，移动终端包括金属边框和收容于金属边框内的系统地101，金属边框包括依次首尾相接的第一短轴边框102、第一长轴边框103、第二短轴边框104和第二长轴边框105，在沿第一长轴边框103的方向上，系统地101与第一短轴边框102的距离不大于1.5mm，系统地101与第一长轴边框103的距离不大于1mm；天线系统包括：连接系统地101和第一短轴边框102的前框筋位1021、开设于第一长轴边框的断缝109、开设于系统地101的射频前端区106和自射频前端区106连接至金属边框的第一接框点107和第二接框点108，第一接框点107和第二接框点108位于前框筋位1021和断缝109之间，射频前端区106上设置有馈电点(图2中未示出)、匹配电路(图2中未示出)、阻抗调谐电路(图2中未示出)和开关电路(图2中未示出)；馈电点通过串联的匹配电路和阻抗调谐电路与第一接框点107电连接，第二接框点108通过开关电路电连接至系统地101，通过调节阻抗调谐电路和开关电路，切换天线系统的工作状态以工作于不同的频段，天线系统包括一种工作状态，在工作状态中，天线系统工作于1710-2700MHz。
在一个例子中，阻抗调谐电路如图3所示，包括第一开关S1、第二开关S2、第一调谐电容器PAC1和第二调谐电容器PAC2；第一调谐电容器PAC1的第一端、第二开关S2的第 一端和第二调谐电容器PAC2的第一端连接，第一调谐电容器PAC1的第一端、第二开关S2的第一端和第二调谐电容器PAC2的第一端之间的节点作为阻抗调谐电路的输入端，第一调谐电容器PAC1的第二端与第一开关S1的第一端连接，第一开关S1的第二端与第二开关S2的第二端连接，第一开关S1的第二端与第二开关S2的第二端之间的节点作为阻抗调谐电路的输出端，第二调谐电容器PAC2的第二端接地。
在一个例子中，阻抗调谐电路可以通过可调芯片实现，例如，型号为QM13011的芯片。
在一个例子中，匹配电路如图4所示，包括：匹配电路包括第一阻抗元件G1、第二阻抗元件G2、第三阻抗元件G3和第四阻抗元件G4；第一阻抗元件G1的第一端作为匹配电路的输入端，第一阻抗元件G1的第二端、第二阻抗元件G2的第一端和第三阻抗元件G3的第一端连接，第二阻抗元件G2的第二端与第四阻抗元件G4的第一端连接，第三阻抗元件G3的第二端和第四阻抗元件G4的第二端接地。该情况下，馈电点、匹配电路、阻抗调谐电路和第一接框点的连接示意图如图5所示。
在一个例子中，第一阻抗元件为第一电阻，第二阻抗元件为第一电感，第三阻抗元件为第二电阻，第四阻抗元件为第二电感。
在一个例子中，第一电阻的阻值为0欧姆，第一电感的电感值为1.5nH，第二电阻的阻值为0.2欧姆，第二电感的电感值为8nH。
需要说明的是，实际应用中，本领域技术人员可以理解，匹配电路中各个阻抗元件的电阻值、电容值和电感值可以根据所需要覆盖的频段设置。
在一个例子中，开关电路如图6所示，包括：第三开关S3、第四开关S4、第五开关S5、第六开关S6、第五阻抗元件G5、第六阻抗元件G6、第七阻抗元件G7、第八阻抗元件G8和第九阻抗元件G9；第三开关S3的第一端通过第五阻抗元件G5接地，第四开关S4的第一端通过第六阻抗元件G6接地，第五开关S5通过第七阻抗元件G7接地，第六开关S6通过第八阻抗元件G8接地，第三开关S3的第二端、第四开关S4的第二端、第五开关S5的第二端和第六开关S6的第二端连接，第三开关S3的第二端、第四开关S4的第二端、第五开关S5的第二端和第六开关S6的第二端之间的节点与第二接框点108连接，第三开关S3的第二端、第四开关S4的第二端、第五开关S5的第二端和第六开关S6的第二端之间的节点通过第九阻抗元件G9接地。
在一个例子中，开关电路可以通过开关控制芯片(如型号为QM13126芯片，或，型号为QM1313的芯片)实现。以通过QM13136芯片为例，该开关电路与第二接框点的连接示例图如图7所示。图7中，RF1为与第三开关S3连接的引脚，RF2为与第四开关S4连接的引脚，RF3为与第五开关S5连接的引脚，RF4为与开关S6连接的引脚。RFC为输出引 脚，GND为接地引脚，VDD为电源引脚，SDATA为数据输入端引脚，SCLK为系统时钟引脚，VIO为数据输入输出电源引脚，ID0为数据输入端引脚。
在一个例子中，第五阻抗元件为第三电感，第六阻抗元件为第一电容，第七阻抗元件为第二电容，第八阻抗元件为第四电感。
在一个例子中，第三电感的10nH，第四电感的电感值为1.8nH，第一电容的电容值为10pF，第二电容的电容值为2.7pF。
需要说明的是，本领域技术人员可以理解，实际应用中，开关电路中各阻抗元件的阻抗值可以根据需要调节，本实施方式不起限定作用。
在一个例子中，馈电点、匹配电路、阻抗调谐电路和第一接框点的连接示意图如图5所示，开关电路与第二接框点的连接示意图如图7所示。该情况下，天线频段表如表1所示，天线系统在各频段的效率图如图8至图10所示。表1中，SW表示开关电路，NA表示不可用，即调节PAC1后，对天线系统的工作频段等不产生影响。
频率 SW PAC1(pF) PAC2(pF) S1 S2
905-960MHz S3和S4闭合 0.65 0.4 开 关
880-935MHz S3和S4闭合 0.87 0.4 开 关
839-894MHz S3和S4闭合 1.1 0.4 开 关
811-879MHz S3和S5闭合 1.07 0.4 开 关
791-842MHz 全关断 0.87 0.4 开 关
738-803MHz 全关断 1.1 0.4 开 关
703-768MHz 全关断 1.32 0.4 开 关
1710-2170MHz S3闭合 NA 0.4 关 开
2300-2700MHz S6闭合 NA 2.08 关 开
1710-2700MHz S6闭合 NA 0.64 关 开
由表1可知，当第一开关S1、第三开关S2和第四开关S3闭合，第二开关S2、第五开关S5和第六开关S6断开，第一调谐电容器PAC1的电容值为0.65pF，第二调谐电容器PAC2的电容值为0.4pF时，天线系统的工作频段覆盖905MHz-960MHz。该工作状态下，天线系统的效率如图8中的曲线1。当第一开关S1、第三开关S3和第四开关S4闭合，第二开关S2、第五开关S5和第六开关S6断开，第一调谐电容器PAC1的电容值为0.87pF，第二调谐电容器PAC2的电容值为0.4pF时，天线系统的工作频段覆盖880MHz-935MHz。该工作状态下，天线系统的效率如图8中的曲线2。当第一开关S1、第三开关S3和第四开关S4闭合， 第二开关S2、第五开关S5和第六开关S6断开，第一调谐电容器PAC1的电容值为1.1pF，第二调谐电容器PAC2的电容值为0.4pF时，天线系统的工作频段覆盖839MHz-894MHz。该工作状态下，天线系统的效率如图8中的曲线3。当第一开关S1、第三开关S3和第五开关S5闭合，第二开关S2、第四开关S4和第六开关S6断开，第一调谐电容器PAC1的电容值为1.07pF，第二调谐电容PAC2的电容值为0.4pF时，天线系统的工作频段覆盖811MHz-879MHz。该工作状态下，天线系统的效率如图9中的曲线4。当第一开关S1闭合，第二开关S2、第三开关S3、第四开关S4、第五开关S5和第六开关S6断开，第一调谐电容器PAC1的电容值为0.87pF，第二调谐电容PAC2的电容值为0.4pF时，天线系统的工作频段覆盖791MHz-842MHz。该工作状态下，天线系统的效率如图9中的曲线5。当第一开关S1闭合，第二开关S2、第三开关S3、第四开关S4、第五开关S5和第六开关S6断开，第一调谐电容器PAC1的电容值为1.1pF，第二调谐电容PAC2的电容值为0.4pF时，天线系统的工作频段覆盖738MHz-803MHz。该工作状态下，天线系统的效率如图9中的曲线6。当第一开关S1闭合，第二开关S2、第三开关S3、第四开关S4、第五开关S5和第六开关S6断开，第一调谐电容器PAC1的电容值为1.32pF，第二调谐电容PAC2的电容值为0.4pF时，天线系统的工作频段覆盖703MHz-768MHz。该工作状态下，天线系统的效率如图10中的曲线7。当第二开关S2和第三开关S3闭合，第一开关S1、第四开关S4、第五开关S5和第六开关S6断开，第二调谐电容器PAC2的电容值为0.4pF时，天线系统的工作频段覆盖1710MHz-2170MHz。该工作状态下，天线系统的效率如图10中的曲线8。当第三开关S3和第六开关S6闭合，第一开关S1、第二开关S2、第四开关S4和第五开关S5断开，第二调谐电容器PAC2的电容值为2.08pF时，天线系统的工作频段覆盖2300MHz-2700MHz。该工作状态下，天线系统的效率如图10中的曲线9。当第三开关S3和第六开关6闭合，第一开关S1、第二开关S2、第四开关S4和第五开关S5断开，第二调谐电容器PAC2的电容值为0.64pF时，天线系统的工作频段覆盖1710MHz-2700MHz。该工作状态下，天线系统的效率如图10中的曲线10。
通过上述内容可知，该天线系统中，通过调整开关电路中各个开关的状态，可以切换天线的工作频段。通过调整第一开关的开关状态、第二开关的开关状态、第一调谐电容器的电容值和第二调谐电容器的电容值中任意一个或任意组合，可以改变馈电点和接框点之间的电路结构，使得天线系统在覆盖1710-2700Hz中各个频段的前提下，顾及1710-2700Hz的各种载波聚合状态，兼顾天线系统在各个工作频段下的性能。
除此之外，通过上述内容可以看出，当移动终端采用频分双工(Frequency Division Duplexing，FDD)模式工作时，即移动终端采用两个独立信道分别进行向下传送信息和向 上传送信息时，该天线系统的两个信道之间存在保护频段，该保护频段涵盖前一工作频段或后一工作频段10MHz以上，以确保FDD模式下两个信道能同时工作。
在一个例子中，在沿第一长轴边框103的方向上，射频前端区106与第一短轴边框102的距离为1.5mm，在沿第一短轴边框102的方向上，射频前端区106与第一长轴边框103的距离为1mm，前框筋位1021到第一长轴边框103的垂直距离为41.33mm。断缝109与第一短轴边框102的垂直距离为14mm，断缝109的宽度为1.8mm。
需要说明的是，以上仅为举例说明，并不对本申请的技术方案的保护范围构成限定。
与现有技术相比，本实施方式中提供的天线系统，通过阻抗匹配电路和开关电路配合，使得天线系统能够工作于更多频段，并且能够保证每个频段的性能，使得天线系统能够满足覆盖1710-2700Hz的各种载波聚合状态。
本申请的第二实施方式提供了一种移动终端，该移动终端包括上述第一实施方式所提供的天线系统。该移动终端尤其适用于全面屏的电子装置。
当然，该移动终端还应当包括处理器、存储器等硬件，其中，存储器和处理器采用总线方式连接，总线可以包括任意数量的互联的总线和桥，总线将一个或多个处理器和存储器的各种电路链接在一起。总线还可以将诸如外围设备、稳压器和功率管理电路等之类的各种其他电路链接在一起，这些都是本领域所公知的，因此，本文不再对其进行进一步描述。总线接口在总线和天线系统之间提供接口。经处理器处理的数据通过天线系统在无线介质上进行传输，进一步，天线系统还接收数据并将数据传送给处理器。处理器负责管理总线和通常的处理，还可以提供各种功能，包括定时，外围接口，电压调节、电源管理以及其他控制功能。而存储器可以被用于存储处理器在执行操作时所使用的数据。
本领域的普通技术人员可以理解，上述各实施方式是实现本申请的具体实施例，而在实际应用中，可以在形式上和细节上对其作各种改变，而不偏离本申请的精神和范围。

Claims (10)

  1. 一种天线系统，应用于移动终端，所述移动终端包括金属边框和收容于所述金属边框内的系统地，所述金属边框包括依次首尾相接的第一短轴边框、第一长轴边框、第二短轴边框和第二长轴边框，在沿第一长轴边框的方向上，所述系统地与所述第一短轴边框的距离不大于1.5mm，所述系统地与所述第一长轴边框的距离不大于1mm；其特征在于，
    所述天线系统包括：连接所述系统地和所述第一短轴边框的前框筋位、开设于所述第一长轴边框的断缝、开设于所述系统地的射频前端区和自所述射频前端区连接至所述金属边框的第一接框点和第二接框点，所述第一接框点和所述第二接框点位于所述前框筋位和所述断缝之间，所述射频前端区上设置有馈电点、匹配电路、阻抗调谐电路和开关电路；所述馈电点通过串联的所述匹配电路和所述阻抗调谐电路与所述第一接框点电连接，所述第二接框点通过所述开关电路电连接至所述系统地，通过调节所述阻抗调谐电路和所述开关电路，切换所述天线系统的工作状态以工作于不同的频段，所述天线系统包括一种工作状态，在所述工作状态中，所述天线系统工作于1710-2700MHz。
  2. 根据权利要求1所述的天线系统，其特征在于，所述阻抗调谐电路包括第一开关、第二开关、第一调谐电容器和第二调谐电容器；
    所述第一调谐电容器的第一端、所述第二开关的第一端和所述第二调谐电容器的第一端连接，所述第一调谐电容器的第一端、所述第二开关的第一端和所述第二调谐电容器的第一端之间的节点作为所述阻抗调谐电路的输入端，所述第一调谐电容器的第二端与所述第一开关的第一端连接，所述第一开关的第二端与所述第二开关的第二端连接，所述第一开关的第二端与所述第二开关的第二端之间的节点作为所述阻抗调谐电路的输出端，所述第二调谐电容器的第二端接地。
  3. 根据权利要求2所述的天线系统，其特征在于，所述匹配电路包括第一阻抗元件、第二阻抗元件、第三阻抗元件和第四阻抗元件；
    所述第一阻抗元件的第一端作为所述匹配电路的输入端，所述第一阻抗元件的第二端、所述第二阻抗元件的第一端和所述第三阻抗元件的第一端连接，所述第二阻抗元件的第二端与所述第四阻抗元件的第一端连接，所述第三阻抗元件的第二端和所述第四阻抗元件的第二端接地。
  4. 根据权利要求3所述的天线系统，其特征在于，所述开关电路包括第三开关、第四开关、第五开关、第六开关、第五阻抗元件、第六阻抗元件、第七阻抗元件、第八阻抗元件和 第九阻抗元件；
    所述第三开关的第一端通过所述第五阻抗元件接地，所述第四开关的第一端通过所述第六阻抗元件接地，所述第五开关通过所述第七阻抗元件接地，所述第六开关通过所述第八阻抗元件接地，所述第三开关的第二端、所述第四开关的第二端、所述第五开关的第二端和所述第六开关的第二端连接，所述第三开关的第二端、所述第四开关的第二端、所述第五开关的第二端和所述第六开关的第二端之间的节点与所述第二接框点连接，所述第三开关的第二端、所述第四开关的第二端、所述第五开关的第二端和所述第六开关的第二端之间的节点通过所述第九阻抗元件接地。
  5. 根据权利要求4所述的天线系统，其特征在于，所述第一阻抗元件为第一电阻，所述第二阻抗元件为第一电感，所述第三阻抗元件为第二电阻，所述第四阻抗元件为第二电感，所述第五阻抗元件为第三电感，所述第六阻抗元件为第一电容，所述第七阻抗元件为第二电容，所述第八阻抗元件为第四电感。
  6. 根据权利要求5所述的天线系统，其特征在于，所述第三电感的电感值为10nH，所述第四电感的电感值为1.8nH，所述第一电容的电容值为10pF，所述第二电容的电容值为2.7pF。
  7. 根据权利要求6所述的天线系统，其特征在于，当所述第一开关、所述第三开关和所述第四开关闭合，所述第二开关、所述第五开关和所述第六开关断开，所述第一调谐电容器的电容值为0.65pF，所述第二调谐电容器的电容值为0.4pF时，所述天线系统的工作频段覆盖905MHz-960MHz；
    当所述第一开关、所述第三开关和所述第四开关闭合，所述第二开关、所述第五开关和所述第六开关断开，所述第一调谐电容器的电容值为0.87pF，所述第二调谐电容器的电容值为0.4pF时，所述天线系统的工作频段覆盖880MHz-935MHz；
    当所述第一开关、所述第三开关和所述第四开关闭合，所述第二开关、所述第五开关和所述第六开关断开，所述第一调谐电容器的电容值为1.1pF，所述第二调谐电容器的电容值为0.4pF时，所述天线系统的工作频段覆盖839MHz-894MHz；
    当所述第一开关、所述第三开关和所述第五开关闭合，所述第二开关、所述第四开关和所述第六开关断开，所述第一调谐电容器的电容值为1.07pF，所述第二调谐电容的电容值为0.4pF时，所述天线系统的工作频段覆盖811MHz-879MHz；
    当所述第一开关闭合，所述第二开关、所述第三开关、所述第四开关、所述第五开关和所述第六开关断开，所述第一调谐电容器的电容值为0.87pF，所述第二调谐电容的电容值为 0.4pF时，所述天线系统的工作频段覆盖791MHz-842MHz；
    当所述第一开关闭合，所述第二开关、所述第三开关、所述第四开关、所述第五开关和所述第六开关断开，所述第一调谐电容器的电容值为1.1pF，所述第二调谐电容的电容值为0.4pF时，所述天线系统的工作频段覆盖738MHz-803MHz；
    当所述第一开关闭合，所述第二开关、所述第三开关、所述第四开关、所述第五开关和所述第六开关断开，所述第一调谐电容器的电容值为1.32pF，所述第二调谐电容的电容值为0.4pF时，所述天线系统的工作频段覆盖703MHz-768MHz；
    当所述第二开关和所述第三开关闭合，所述第一开关、所述第四开关、所述第五开关和所述第六开关断开，所述第二调谐电容器的电容值为0.4pF时，所述天线系统的工作频段覆盖1710MHz-2170MHz；
    当所述第三开关和所述第六开关闭合，所述第一开关、所述第二开关、所述第四开关和所述第五开关断开，所述第二调谐电容器的电容值为2.08pF时，所述天线系统的工作频段覆盖2300MHz-2700MHz；
    当所述第三开关和所述第六开关闭合，所述第一开关、所述第二开关、所述第四开关和所述第五开关断开，所述第二调谐电容器的电容值为0.64pF时，所述天线系统的工作频段覆盖1710MHz-2700MHz。
  8. 根据权利要求1至7中任一项所述的天线系统，其特征在于，在沿第一长轴边框的方向上，所述射频前端区与所述第一短轴边框的距离为1.5mm，在沿第一短轴边框的方向上，所述射频前端区与所述第一长轴边框的距离为1mm，所述前框筋位与所述第一长轴边框的垂直距离为41.33mm。
  9. 根据权利要求1至7中任一项所述的天线系统，其特征在于，所述断缝与所述第一短轴边框的垂直距离为14mm，所述断缝的宽度为1.8mm。
  10. 一种移动终端，其特征在于，包括权利要求1至9任一项所述的天线系统。
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