WO2018090295A1 - 通信终端 - Google Patents

通信终端 Download PDF

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Publication number
WO2018090295A1
WO2018090295A1 PCT/CN2016/106269 CN2016106269W WO2018090295A1 WO 2018090295 A1 WO2018090295 A1 WO 2018090295A1 CN 2016106269 W CN2016106269 W CN 2016106269W WO 2018090295 A1 WO2018090295 A1 WO 2018090295A1
Authority
WO
WIPO (PCT)
Prior art keywords
radiator
antenna
communication terminal
metal frame
antenna module
Prior art date
Application number
PCT/CN2016/106269
Other languages
English (en)
French (fr)
Inventor
吴鹏飞
余冬
李建铭
Original Assignee
华为技术有限公司
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 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2016/106269 priority Critical patent/WO2018090295A1/zh
Priority to JP2019526249A priority patent/JP6869349B2/ja
Priority to US16/461,561 priority patent/US11011837B2/en
Priority to AU2016429569A priority patent/AU2016429569B2/en
Priority to CN201680082446.0A priority patent/CN108701889B/zh
Priority to CN202010028753.9A priority patent/CN111129768B/zh
Priority to EP16921746.0A priority patent/EP3531502B1/en
Publication of WO2018090295A1 publication Critical patent/WO2018090295A1/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
    • H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
    • H01Q1/521—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas
    • H01Q1/523—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas between antennas of an array
    • 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
    • H01Q1/12—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
    • H01Q1/48—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
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
    • H01Q1/521—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/0006—Particular feeding systems
    • H01Q21/0025—Modular arrays
    • 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
    • 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
    • H01Q5/342—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
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
    • H01Q9/0421—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with a shorting wall or a shorting pin at one end of the element

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a communications terminal including a multiple input multiple output antenna system.
  • MIMO multi-input multi-output
  • ID Terminals of the Industrial Design
  • MIMO The antenna frequency band is often the same as the original communication antenna frequency band, resulting in deterioration of the isolation of the antenna system. More importantly, the transmission characteristics of the MIMO antenna place high demands on the antenna pattern, and the pattern between the antennas needs to be complementary.
  • Embodiments of the present invention provide a communication terminal including a multiple input multiple output antenna system, which increases the isolation between multiple antennas through the modular design of the antenna, improves the complementarity between the multiple antenna patterns, and improves the radiation of the antenna system. performance.
  • An embodiment of the present invention provides a communication terminal, including a multiple input multiple output antenna system, where the multiple input multiple output antenna system includes a first antenna module, a second antenna module, and a first ground structure;
  • the first antenna module includes a first radiator and a second radiator, and a first gap is formed between the first radiator and the second radiator;
  • the second antenna module includes a third radiator and a fourth radiator, and the second radiator is connected to the third radiator, the first radiator is located on a side of the second radiator opposite to the third radiator, and the fourth radiator Located on a side of the third radiator opposite to the second radiator;
  • the first radiator is used to form a first MIMO antenna
  • the second radiator is used to form a GPS antenna
  • a third radiator is used to form a first low frequency communication antenna
  • a fourth radiator is used to form a second MIMO antenna
  • the first ground structure is connected at one end to at least one of the second radiator and the third radiator, and the other end is connected to at least one ground plane of the communication terminal for increasing the isolation between the first antenna module and the second antenna module.
  • the isolation between the first MIMO antenna and the second MIMO antenna can be effectively increased; and at the same time, by the first radiation
  • the first gap is formed between the body and the second radiator, which can effectively increase the frequency coverage of the first antenna module, and can ensure at least one gap between the first radiator and the fourth radiator, which is beneficial to further improve the multiple input. Isolation of multiple output antenna systems.
  • the first antenna module further includes a first feed port and a second feed port, the first feed port is connected to the first radiator, and is configured to feed the first signal source, and the first The radiators collectively form a first MIMO antenna, and the second feed port is coupled to the second radiator for feeding the second signal source and forming a GPS antenna together with the second radiator.
  • a multi-feed antenna form is formed inside the first antenna module, and the GPS band and other frequency bands can be split, which is beneficial to reducing the entire antenna system.
  • the design is difficult and can improve the directionality of the GPS antenna.
  • the first antenna module further includes a first band pass filter, the first band pass filter being connected in parallel with the second feed port for increasing isolation between the first radiator and the second radiator degree.
  • the isolation between the first MIMO antenna and the GPS antenna can be further improved by connecting the first band pass filter in parallel with the second feed port.
  • the second antenna module further includes a third feed port and a fourth feed port, the third feed port is connected to the third radiator, and is configured to feed the third signal source, and the third The radiators together form a first low frequency communication antenna, and the fourth feed port is connected to the fourth radiator for feeding the fourth signal source, and together with the fourth radiator forms a second MIMO antenna, a third radiator and a A second gap is formed between the four radiators for increasing the isolation between the third radiator and the fourth radiator.
  • the multi-feed antenna form is formed inside the second antenna module, which is advantageous for reducing the design difficulty of the entire antenna system; Forming a second MIMO antenna to spatially position with the first MIMO antenna Farther apart, it is beneficial to improve the isolation of the MIMO antenna system.
  • the second antenna module further includes a second band pass filter, the second band pass filter is connected in parallel with the third feed port for increasing the isolation between the third radiator and the fourth radiator degree.
  • the isolation between the first low frequency communication antenna and the second MIMO antenna can be further improved by connecting the second band pass filter in parallel with the third feed port.
  • the other end of the first ground structure is simultaneously connected to at least two ground planes of the communication terminal to form a three-dimensional isolation structure between the first antenna module and the second antenna module, wherein at least two The ground plane includes at least two of a front case ground plane, a rear case ground plane, and a radio frequency reference ground plane of the communication terminal.
  • the first antenna module and the second antenna are connected by connecting the other end of the first ground structure to at least two of the front case ground plane, the rear case ground plane, and the radio frequency reference ground plane of the communication terminal.
  • the three-dimensional isolation structure between the modules is beneficial to further improve the isolation effect of the first ground structure.
  • the multiple input multiple output antenna system further includes a third antenna module, a fourth antenna module, and a second ground structure;
  • the third antenna module includes a fifth radiator and a sixth radiator, and a third gap is formed between the fifth radiator and the sixth radiator;
  • the fourth antenna module includes a seventh radiator and an eighth radiator, the sixth radiator is connected to the seventh radiator, and the fifth radiator is located on a side of the sixth radiator opposite to the seventh radiator, and the eighth radiator Located on a side of the seventh radiator opposite to the sixth radiator;
  • the fifth radiator and the sixth radiator are used to form a third MIMO antenna, the seventh radiator is used to form a second low frequency communication antenna, and the eighth radiator is used to form a fourth MIMO antenna;
  • the second grounding structure is connected at one end to at least one of the sixth radiator and the seventh radiator, and the other end is connected to at least one grounding surface of the communication terminal for improving the isolation between the third antenna module and the fourth antenna module.
  • the isolation between the third MIMO antenna and the fourth MIMO antenna can be effectively increased; meanwhile, by the fifth radiation A third gap is formed between the body and the sixth radiator to ensure at least one gap between the fifth radiator and the eighth radiator, which is beneficial to further improve the MIMO system. Isolation.
  • the third antenna module further includes a fifth feed port, the fifth feed port is connected to the fifth radiator, and is configured to feed the fifth signal source, and the fifth radiator and the sixth radiation
  • the bodies together form a third MIMO antenna, wherein the sixth radiator is coupled to the fifth radiator through the third slot.
  • the third antenna module is set to the single-feed antenna configuration, and the sixth radiator is set as the coupling branch, which is beneficial to reducing the design difficulty of the entire antenna system. .
  • the fourth antenna module further includes a sixth feed port and a seventh feed port, the sixth feed port is connected to the seventh radiator, and is configured to feed the sixth signal source, and the seventh The radiators together form a second low frequency communication antenna, and the seventh feed port is connected to the eighth radiator for feeding the seventh signal source, and together with the eighth radiator forms a fourth MIMO antenna, a seventh radiator and a A fourth gap is formed between the eight radiators for increasing the isolation between the seventh radiator and the eighth radiator.
  • the multi-feed antenna form is formed inside the fourth antenna module, which is advantageous for reducing the design difficulty of the entire antenna system; Forming the fourth MIMO antenna to be distant from the third MIMO antenna in a spatial position is advantageous for improving the isolation of the MIMO antenna system.
  • the fourth antenna module further includes a third band pass filter, the third band pass filter is connected in parallel with the sixth feed port for increasing the isolation between the seventh radiator and the eighth radiator degree.
  • the isolation between the second low frequency communication antenna and the fourth MIMO antenna can be further improved by paralleling the third band pass filter on the sixth feed port.
  • the other end of the second ground structure is simultaneously connected to at least two ground planes of the communication terminal to form a three-dimensional isolation structure between the third antenna module and the fourth antenna module, wherein at least two The ground plane is at least two of a front case ground plane, a rear case ground plane, and a radio frequency reference ground plane of the communication terminal.
  • the third antenna module and the fourth antenna are connected to each other by connecting the other end of the second ground structure to at least two of the front case ground plane, the rear case ground plane, and the radio frequency reference ground plane of the communication terminal.
  • the three-dimensional isolation structure between the modules is beneficial to further improve the isolation effect of the second ground structure.
  • the communication terminal further includes a metal frame
  • the metal frame includes a top metal edge a frame, a bottom metal frame, a first side metal frame and a second side metal frame, the top metal frame and the bottom metal frame are oppositely disposed, the first side metal frame and the second side metal frame respectively and the top metal frame and the bottom metal
  • the two ends of the frame are connected, and the first to eighth radiators are respectively a part of the metal frame.
  • the first radiator is a partial top metal frame of the communication terminal and a part of the first side metal frame
  • the second radiator and the third radiator are part of the top metal frame of the communication terminal
  • the fourth radiator is a part of the top metal frame and a part of the second side metal frame of the communication terminal
  • a sixth gap is formed between the two side metal frames and the remaining second side metal frame.
  • the fifth radiator is a partial bottom metal frame and a second side metal frame of the communication terminal
  • the sixth radiator and the seventh radiator are part of the bottom metal frame of the communication terminal
  • the eighth radiator a portion of the bottom metal frame and a portion of the first side metal frame of the communication terminal, and a seventh gap between the second side metal frame as the fifth radiator and the remaining second side metal frame, as the eighth radiator
  • An eighth gap is formed between a portion of the first side metal frame and the remaining first side metal frame.
  • the first radiator is a part of the first side metal frame of the communication terminal
  • the second radiator is a partial top metal frame of the communication terminal
  • the third radiator is a communication terminal.
  • a portion of the top metal frame and a portion of the second side metal frame, and the fourth radiator is a portion of the second side metal frame of the communication terminal.
  • the fifth radiator is a part of the second side metal frame of the communication terminal
  • the sixth radiator is a partial bottom metal frame of the communication terminal, and a part of the second side metal frame
  • the seventh radiator is a communication terminal.
  • a portion of the bottom metal frame and a portion of the first side metal frame, and the eighth radiator is a portion of the first side metal frame of the communication terminal.
  • the antenna By using part of the metal frame of the communication terminal as the radiator of each antenna module of the multi-input multi-output antenna system, it is beneficial to improve the radiation performance of the antenna system; at the same time, the antenna can be secured by flexibly setting the opening position of the gap on the metal frame. At the same time of radiation performance, the design of different requirements is realized, which is conducive to improving the product quality of the communication terminal.
  • the frequency band covered by the first low frequency communication mode antenna includes at least 700 MHz-960 MHz
  • the frequency band covered by the mimo first MIMO antenna and the second MIMO antenna includes at least 1700 MHz-2700 MHz.
  • the frequency band covered by the second low frequency communication antenna includes at least 700 MHz to 960 MHz
  • the frequency band covered by the third MIMO antenna and the fourth MIMO antenna includes at least 1700 MHz. -2700MHz.
  • FIG. 1 is a first schematic structural diagram of a communication terminal according to an embodiment of the present invention.
  • FIG. 2 is a first schematic structural diagram of a top antenna system of a communication terminal according to an embodiment of the present invention
  • FIG. 3 is a first schematic structural diagram of a grounding structure of a top antenna system of a communication terminal according to an embodiment of the present invention
  • FIG. 4 is a second schematic structural diagram of a grounding structure of a top antenna system of a communication terminal according to an embodiment of the present invention
  • FIG. 5 is a second schematic structural diagram of a top antenna system of a communication terminal according to an embodiment of the present invention.
  • FIG. 6 is a third schematic structural diagram of a top antenna system of a communication terminal according to an embodiment of the present invention.
  • FIG. 7 is a fourth schematic structural diagram of a top antenna system of a communication terminal according to an embodiment of the present invention.
  • FIG. 8 is a first schematic structural diagram of a bottom antenna system of a communication terminal according to an embodiment of the present invention.
  • FIG. 9 is a second schematic structural diagram of a bottom antenna system of a communication terminal according to an embodiment of the present invention.
  • FIG. 10 is a third schematic structural diagram of a bottom antenna system of a communication terminal according to an embodiment of the present invention.
  • FIG. 11 is a second schematic structural diagram of a communication terminal according to an embodiment of the present invention.
  • FIG. 12 is a schematic diagram showing a third structure of a communication terminal according to an embodiment of the present invention.
  • FIG. 13 is a fourth schematic structural diagram of a communication terminal according to an embodiment of the present invention.
  • FIG. 14 is a schematic diagram showing a fifth structure of a communication terminal according to an embodiment of the present invention.
  • FIG. 15 is a sixth structural diagram of a communication terminal according to an embodiment of the present invention.
  • FIG. 16 is a schematic diagram showing a seventh structure of a communication terminal according to an embodiment of the present invention.
  • 17 is a schematic diagram of a reflection coefficient curve of a top antenna system of a communication terminal according to an embodiment of the present invention.
  • FIG. 18 is a schematic diagram of a transmission coefficient curve of a top antenna system of a communication terminal according to an embodiment of the present invention.
  • 19 is a schematic diagram of Wi-Fi and GPS antennas of a top antenna system of a communication terminal according to an embodiment of the present invention.
  • FIG. 20 is a schematic diagram of a MIMO1 antenna and a MIMO2 antenna of a top antenna system of a communication terminal according to an embodiment of the present invention
  • 21 is a schematic diagram of a reflection coefficient curve of a bottom antenna system of a communication terminal according to an embodiment of the present invention.
  • 22 is a schematic diagram of a transmission coefficient curve of a bottom antenna system of a communication terminal according to an embodiment of the present invention.
  • FIG. 23 is a schematic diagram of a MIMO3 antenna and a MIMO4 antenna of a bottom antenna system of a communication terminal according to an embodiment of the present invention.
  • the embodiment of the invention provides a communication terminal with a layout design of a novel multi-input multiple-output antenna system, and implements a multi-input multi-output (Multi-input Multi-) on a communication terminal of an industrial design (ID).
  • Output, MIMO) Antenna system performance, and the Global Positioning System (GPS), the directionality of the Wi-Fi antenna, and the Carrier Aggregation (CA) performance of the LTE band are also optimized.
  • the modular design of the antenna such as dividing the top metal frame of the communication terminal into two antenna modules (GPS and / or Wi-Fi antenna module and communication antenna module), and designing the MIMO antennas of the same frequency band differently.
  • the antenna module at least one slotted slot is ensured between the MIMO antennas; at the same time, the isolation between the MIMO antennas is further improved by designing a grounding structure adjacent to the two antenna modules; since the MIMO antennas are on both sides of the grounding structure The positional relationship enables a better complement of the pattern.
  • the MIMO antenna can be combined with the original communication antenna or the GPS/Wi-Fi antenna to form a single-fed antenna, or can be designed as a multi-feed antenna. Since the design of the single-fed antenna is generally difficult, some special frequency bands (GPS or low-frequency communication bands) can be split and a multi-feed antenna system is formed inside the antenna module, thereby reducing the design difficulty of each antenna and improving the GPS. And the directionality of the Wi-Fi antenna, while helping the multi-CA performance under Long-Term Evolution (LTE) communication. In addition, since the operating frequency bands between the multi-feed antennas do not overlap, it is advantageous to improve and optimize the isolation between the antennas.
  • GPS Global System
  • LTE Long-Term Evolution
  • the technical solutions provided by the embodiments of the present invention can be applied to various communication systems currently used by communication terminals, such as GSM, CDMA, WCDMA, GPRS, LTE, LTE-A, UMTS, etc., and the technical solutions in the following embodiments
  • the requirements of the communication network are not limited, and the operating characteristics of the antenna are described only in terms of the frequency band.
  • the embodiments of the present invention can be applied to communication terminals of various IDs. In the description of the embodiments, the metal ID communication terminals having double slot slots on the top and bottom metal frames are mainly described.
  • a communication terminal 100 includes a metal frame 101 and a rear case ground plane 102.
  • the metal frame 101 includes a top metal frame 1011 and a bottom metal frame 1012. a side metal frame 1013 and a second side metal frame 1014, the top metal frame 1011 is opposite to the bottom metal frame 1012, and the first side metal frame 1013 and the top metal frame 1011 and the bottom end respectively One end of the metal frame 1012 is rounded, and the second side metal frame 1014 is rounded with the top end metal frame 1011 and the other end of the bottom metal frame 1012 to form a rounded rectangular area.
  • the back shell ground plane 102 is disposed in the rounded rectangular area and is respectively connected to the first side metal frame 1012 and the second side metal frame 1014. It can be understood that the rear case ground plane 102 can be a metal back shell of the communication terminal 100.
  • the top metal frame 1011 is respectively provided with a first slit S1 and a second slit S2 near the round corners near the two ends thereof, and the bottom metal frame 1012 is respectively provided with a third slit S3 near the round corners near the two ends thereof.
  • the first slit S1, the second slit S2, the third slit S3, and the fourth slit S4 are distributed clockwise on the metal frame 101. It can be understood that, in practical applications, the positions of the first slot S1, the second slot S2, the third slot S3, and the fourth slot S4 may be changed as needed, and non-conductive materials (such as plastic) may be used in the slots. Filling to ensure the appearance integrity of the metal frame 101.
  • the communication terminal 100 further includes a multiple input multiple output antenna system 10, the multiple input multiple output antenna system 10 includes a first antenna module 11, a second antenna module 12 and a first ground structure 13;
  • the first antenna module 11 includes a first radiator 111 and a second radiator 112, and the first antenna a first slit S1 is defined between the emitter 111 and the second radiator 112;
  • the second antenna module 12 includes a third radiator 121 and a fourth radiator 122, and a second slit S2 is defined between the third radiator 121 and the fourth radiator 122;
  • the second radiator 112 is connected to the third radiator 121, and the first radiator 111 is located on a side of the second radiator 112 opposite to the third radiator 121, and the fourth The radiator 122 is located on a side of the third radiator 121 opposite to the second radiator 112;
  • the first radiator 111 is used to form a first MIMO antenna
  • the second radiator 112 is used to form a GPS antenna
  • the third radiator 121 is used to form a first low frequency communication antenna
  • the fourth radiator 122 is used to form a second MIMO antenna
  • One end of the first ground structure 13 is connected to at least one of the second radiator 112 and the third radiator 121, and the other end of the first ground structure 13 may be connected to at least the communication terminal 100
  • a grounding surface for example, the other end of the first grounding structure 13 may be connected to a front case ground plane (not shown) of the communication terminal 100, a rear case ground plane 102, and a radio frequency reference ground plane (not shown). Any one or more of them.
  • stereo isolation may be formed between the first antenna module 11 and the second antenna module 12 Structure, thereby increasing the isolation between the first antenna module 11 and the second antenna module 12.
  • the first ground structure 13 may include a metal sheet body 131 (FIG. 3) or a plurality of metal sheet bodies 131 (FIG. 4). If the first ground structure 13 includes a plurality of metal sheets 131, the plurality of metal sheets 131 may be disposed parallel to the rear case ground plane 102 of the communication terminal 100 and perpendicular to the back shell ground plane The directions of 102 are aligned with each other and a certain interval is reserved.
  • one end of the plurality of metal sheets 131 may be connected to at least one of the second radiator 112 and the third radiator 121, and the other ends of the plurality of metal sheets 131 are respectively one to one A plurality of grounding surfaces connected to the communication terminal 100, and one end of the plurality of metal sheets 131 connected to the plurality of ground planes may be connected to each other through a metal dome 133, thereby forming a three-dimensional isolation structure, further improving Isolation effect.
  • the communication terminal 100 can be a mobile phone, a tablet computer, or the like.
  • the first antenna module 11 and the second antenna module 12 are both located at the top of the communication terminal 100, and the first ground structure 13 may be located at the first antenna module 11 and the second antenna module 12.
  • the first antenna module 11 or the second antenna module 12 may be located inside, as shown in FIG. 5, by placing the first ground structure 13 at the edge position of the first slot S1, and the third radiator A portion of the 121 adjacent to the first ground structure 13 is multiplexed into the second radiator 112 such that the ground structure 13 is located inside the first antenna module 11.
  • the arrangement of the first antenna module 11 and the second antenna module 12 at the top end of the communication terminal 100 may also be interchanged, as shown in FIG. 6.
  • the first radiator 111, the second radiator 112, the third radiator 121, and the fourth radiator 122 are a part of the metal frame 101. It can be understood that the first radiator 111, the second radiator 112, the third radiator 121, and the fourth radiator 122 may also be independent radiators embedded in the top end of the communication terminal 100, or partially The metal frame 101 is partially an independent radiator.
  • the first antenna module 11 further includes a first feed port port 1 and a second feed port port 2 , the first feed port port 1 and the first radiator a connection for feeding a first signal source and forming a first MIMO antenna together with the first radiator 111; the second feed port port2 is connected to the second radiator 112 for feeding A second signal source and together with the second radiator 112 form a GPS antenna.
  • the second antenna module 12 further includes a third feed port port 3 and a fourth feed port port 4, and the third feed port port 3 is connected to the third radiator 121 for feeding a third signal source. And forming a first low frequency communication antenna together with the third radiator 121; the fourth feed port port4 is connected to the fourth radiator 122, for feeding the fourth signal source, and the fourth The radiators 122 collectively form a second MIMO antenna.
  • the antenna inside each module can be designed as a single-feed or multi-feed antenna.
  • the antenna frequency band covered by the first antenna module 11 includes a GPS and a first MIMO antenna MIMO1 frequency band (for example, at least a Wi-Fi range of 1700 MHz to 2700 MHz and a medium and high frequency range) Communication band). If the first antenna module 11 is designed as a multi-feed antenna, since the GPS frequency band is low and functionally different from other communication frequency bands, the grounding structure can be used to combine the second radiator 112 to separately implement the GPS frequency band.
  • the coverage of the MIMO1 band can be achieved by using the ground structure in combination with the first radiator 111 to be separately fed.
  • the antenna frequency band covered by the second antenna module 12 includes a first low frequency communication frequency band LB1 (for example, may include at least an LTE low frequency communication frequency band in a range of 700 MHz to 960 MHz) and a second MIMO antenna
  • the MIMO2 band (for example, at least Wi-Fi in the range of 1700 MHz to 2700 MHz and the medium and high frequency communication band).
  • the third radiator 121 can be separately fed to achieve coverage of the LB1 frequency band; accordingly, the fourth radiator 122 can be separately fed by the fourth radiator 122. Realize coverage of the MIMO2 band.
  • the spatial distance between MIMO1 and MIMO2 is increased, it is advantageous to improve the isolation between the multiple input and multiple output antennas and the complementarity of the patterns.
  • the first antenna module 11 further includes a first band pass filter F1, and the first band pass filter F1 is connected in parallel with the second feed port port2.
  • the isolation between the first radiator 111 and the second radiator 112 is increased.
  • the second antenna module 12 further includes a second band pass filter F2, and the second band pass filter F2 is connected in parallel with the third feed port port3 for adding the third radiator 121 and the The isolation between the fourth radiators 122.
  • a first band pass filter F1 operating at a communication frequency band intermediate frequency (eg, 2 GHz) at a feed port port 2 of the GPS antenna for filtering out the first MIMO antenna coupled to the first slot S1
  • the intermediate frequency signal on the GPS antenna can further improve the isolation between the GPS antenna and the MIMO1; similarly, in the feed port port3 of the first low frequency communication antenna, a second phase operating in the communication frequency band intermediate frequency (such as 1.8 GHz) is connected in parallel.
  • a bandpass filter F2 for filtering the intermediate frequency signal coupled to the first low frequency communication antenna by the second MIMO antenna through the second slot S2, which can further improve the isolation between the first low frequency communication antenna and the MIMO2 . It will be appreciated that this method of improving the isolation between the internal antennas of the module is not limited to being implemented by the addition filter described above.
  • the multiple input multiple output antenna system 10 further includes a third antenna module 14, a fourth antenna module 15, and a second ground structure 16;
  • the third antenna module 14 includes a fifth radiator 141 and a sixth radiator 142, and a third slit S3 is defined between the fifth radiator 141 and the sixth radiator 142;
  • the fourth antenna module 15 includes a seventh radiator 151 and an eighth radiator 152, the sixth radiator 142 is connected to the seventh radiator 151, and the fifth radiator 141 is located at the sixth radiation.
  • the body 142 is opposite to one side of the seventh radiator 151, and the eighth radiator 152 is located at a side of the seventh radiator 151 opposite to the sixth radiator 142;
  • the fifth radiator 141 and the sixth radiator 142 are used to form a third MIMO antenna.
  • the seventh radiator 151 is configured to form a second low frequency communication antenna, and the eighth radiator 152 is configured to form a fourth MIMO antenna;
  • One end of the second ground structure 16 is connected to at least one of the sixth radiator 142 and the seventh radiator 151, and the other end of the second ground structure 16 may be connected to the communication terminal 100.
  • At least one grounding surface for example, the other end of the second grounding structure 16 may be connected to a front case ground plane (not shown), a rear case ground plane 102, and a radio frequency reference ground plane of the communication terminal 100 (not shown) Any one or more of them.
  • stereo isolation may be formed between the third antenna module 14 and the fourth antenna module 15 Structure, thereby increasing the isolation between the third antenna module 14 and the fourth antenna module 15.
  • the third antenna module 14 and the fourth antenna module 15 are located at the bottom end of the communication terminal 100, and the second ground structure 16 may be located at the third antenna module 14 and the fourth antenna module 15
  • the internal structure of the third antenna module 14 or the fourth antenna module 15 may be referred to.
  • the arrangement of the third antenna module 14 and the fourth antenna module 15 at the bottom end of the communication terminal 100 may also be interchanged.
  • the fifth radiator 141, the sixth radiator 142, the seventh radiator 151, and the eighth radiator 152 are a part of the metal frame 101. It can be understood that the fifth radiator 141, the sixth radiator 142, the seventh radiator 151, and the eighth radiator 152 may also be independent radiators embedded in the bottom end of the communication terminal 100, or partially The metal frame 101 is partially an independent radiator.
  • the third antenna module 14 further includes a fifth feed port port 5, and the fifth feed port port 5 is connected to the fifth radiator 141 for feeding a fifth signal source, and together with the fifth radiator 141 and the sixth radiator 142, form a third MIMO antenna, wherein the sixth radiator 142 passes through the third slot S3 and the fifth The radiator 141 is coupled.
  • the fourth antenna module 15 further includes a sixth feed port port 6 and a seventh feed port port 7 , and the sixth feed port port 6 is connected to the seventh radiator 151 for feeding the sixth signal source. And forming a second low frequency communication antenna together with the seventh radiator 151, the seventh feed The port port 7 is connected to the eighth radiator 152 for feeding a seventh signal source and together with the eighth radiator 152 to form a fourth MIMO antenna.
  • the bottom antenna system of the communication terminal 100 is implemented, similar to the design method of the top antenna system, the bottom antenna system of the communication terminal 100 is divided into two antenna modules by using the second ground structure: a third antenna module 14.
  • the antenna frequency band that the third antenna module 14 can cover includes a third MIMO antenna MIMO3 frequency band (for example, at least a Wi-Fi and a medium-high frequency communication frequency band in a range of 1700 MHz to 2700 MHz); and a fourth antenna module 15
  • the antenna frequency band that can be covered includes: a second low frequency communication frequency band LB2 (for example, at least an LTE low frequency communication frequency band in a range of 700 MHz to 960 MHz) and a fourth MIMO antenna MIMO 4 frequency band (for example, at least a WiW range of 1700 MHz to 2700 MHz) -Fi and medium and high frequency communication bands).
  • the third antenna module 14 can be designed as a single-feed antenna, that is, the third radiator S1 is separately fed with respect to the fifth radiator 141 on the side of the second ground structure 16 by using the third slot S3, and the sixth The radiator 142 serves as an antenna coupling unit to achieve coverage of the MIMO3 band.
  • the fourth antenna module 15 can adopt a design method similar to the second antenna module 12, that is, LB2 and MIMO4 are designed as multi-feed antennas, as shown in FIG.
  • the fourth antenna module 15 further includes a third band pass filter F3, and the third band pass filter F3 is connected in parallel with the sixth feed port port6. Filtering an intermediate frequency signal coupled to the second low frequency communication antenna by the fourth MIMO antenna through the fourth slot S4, thereby increasing between the seventh radiator 151 and the eighth radiator 152 Isolation. It can be understood that the isolation between the second low frequency communication antenna and the MIMO4 can be further improved by paralleling a third band pass filter F3 operating at a communication band intermediate frequency (eg, 1.8 GHz) at the sixth feed port port6. .
  • a communication band intermediate frequency eg, 1.8 GHz
  • the multi-input multi-output antenna system 10 constructed by the above design method can realize the medium-high frequency communication frequency band and the 4*4 MIMO antenna layout of the Wi-Fi frequency band.
  • the directionality of GPS and Wi-Fi antennas and the multi-carrier aggregation performance of communication bands (such as LTE B3+B7+B20) are also improved and optimized compared with the conventional scheme.
  • the multiple input multiple output antenna system 10 provided by the embodiment of the present invention can be applied to other metal in addition to the communication terminal 100 having the window structure and the metal frame described in the above embodiments.
  • the appearance structure realizes the communication terminal of the antenna radiator.
  • the metal frame plus the glass back shell structure as shown in Figure 11
  • the metal frame structure of the upper and lower U-shaped grooves Figure 12
  • the combination of the above several metal frame structures Figure 13
  • the location of the slot on the metal frame of the communication terminal of the MIMO antenna system 10 provided by the embodiment of the present invention may also adopt different solutions according to the requirements of frequency band coverage and design, for example, two antenna modules are used.
  • two slits can be opened on the top surface and the side surface of the metal frame, as shown in FIG. 14, that is, in addition to S1 and S2 shown in FIG. 4 and S3 and S4 shown in FIG. 8, it may also include S5 and S6 respectively located on the metal frames on both sides close to the top of the communication terminal and S7 and S8 respectively located on the metal frames on both sides near the bottom end of the communication terminal.
  • a gap may be opened on the top metal frame of the communication terminal and the metal frame on one side, as shown in FIG.
  • the MIMO antenna system 10 can also be applied to a part of a metal appearance structure (ie, a metal frame of a communication terminal) as an antenna radiator or a metal appearance structure as an antenna radiation.
  • a metal appearance structure ie, a metal frame of a communication terminal
  • the first MIMO antenna and the second MIMO antenna portion in FIG. 7 are implemented in a metal appearance structure, and the GPS antenna and the first low-frequency communication antenna are all realized by a metal appearance structure, so that a metal frame design similar to only the side slit can be realized. , as shown in Figure 16. It can be understood that the above examples only illustrate the diversity of the design of the gap position on the metal frame, and do not constitute any limitation on the position of the gap on the metal frame.
  • the first radiator 111 is a partial top metal frame 1011 and a portion of the first side metal frame 1013 of the communication terminal
  • the third radiator 121 is a partial top metal frame 1011 of the communication terminal
  • the fourth radiator 122 is a partial top metal frame 1011 and a second side metal frame 1014 of the communication terminal as the first radiation.
  • a fifth slit S5 is defined between a portion of the first side metal frame 1013 of the body 111 and the remaining first side metal frame 1013 as a portion of the second side metal frame 1014 of the fourth radiator 122 and the remaining second side metal
  • a sixth slit S6 is opened between the frames 1014.
  • the fifth radiator 141 is a part of the bottom metal frame 1012 and a portion of the second side metal frame 1014 of the communication terminal, and the six radiators 142 and the seventh radiator 151 are part of the communication terminal.
  • the end metal frame 1012, the eighth radiator 152 is a partial bottom metal frame 1012 and a portion of the first side metal frame 1013 of the communication terminal, as a part of the second side metal frame 1014 of the fifth radiator 141 and a seventh slit S7 is formed between the remaining second side metal frames 1014.
  • An eighth slit S8 is defined between a portion of the first side metal frame 1013 as the eighth radiator 152 and the remaining first side metal frame 1013.
  • the first radiator 111 is a part of the first side metal frame 1013 of the communication terminal
  • the second radiator 112 is a part of the top metal frame of the communication terminal.
  • the third radiator 121 is a part of the top metal frame 1011 and a part of the second side metal frame 1014 of the communication terminal
  • the fourth radiator 122 is the communication terminal Part of the second side metal frame 1014.
  • the fifth radiator 141 is a part of the second side metal frame 1014 of the communication terminal
  • the sixth radiator 142 is a part of the bottom metal frame 1012 and a part of the second side metal frame 1014 of the communication terminal.
  • the seventh radiator 151 is a partial bottom metal frame 1012 and a portion of the first side metal frame 1013 of the communication terminal
  • the eighth radiator 152 is a portion of the first side metal frame 1013 of the communication terminal.
  • the first feed port port1 and the second feed port port2 are The antenna reflection coefficients obtained by simulation of the three-feed port port3 and the fourth feed port port4 are respectively shown in curves S11, S22, S33 and S44, and port1 and port4 are designed with broadband matching, which can respectively satisfy LTE B3+LTE B7. +Wi-Fi band MIMO antenna frequency band requirements.
  • the curves S21, S32, S41, S42, and S43 shown in Fig. 18 are transmission coefficient curves between the respective feed ports, respectively, and S31 is less than -30 dB, which is not shown in Fig.
  • Figure 19 shows the direction of the GPS antenna and MIMO1 antenna
  • Figure 20 shows the LTE B3 and B7 bands in the top two MIMO antennas.
  • GPS and Wi-Fi The upper hemisphere of the antenna accounts for nearly 60%, and the patterns of the two MIMO antennas are very complementary.
  • the fifth feed port port 5, the sixth feed port port 6 and the The antenna reflection coefficients obtained by the seven-feed port port7 simulation are shown in curves S55, S66 and S77, respectively.
  • the antenna at port7 adopts broadband matching design, and the antenna at port 5 passes through one.
  • the design of the feeding unit and a coupling unit (sixth radiator 142) can respectively satisfy the frequency band requirement of the LTE B3+LTE B7+Wi-Fi band MIMO antenna.
  • Curves S65, S75 and S76 shown in Fig. 22 are transmission coefficient curves between the respective feed ports, respectively, reflecting that the antenna isolation is above 10 dB.
  • Figure 23 shows the LTE B3 and B7 bands in the bottom two MIMO antennas. It can be seen from the figure that the two MIMO antennas at the bottom also have good complementarity. It can be understood that, in the embodiment of the present invention, the specific form of the antenna forming the antenna modules is not limited, and may be, for example, an inverted F antenna (IFA), a planar inverted F antenna (PIFA), or a loop antenna. In the simulation embodiment shown in FIGS. 17 to 23, simulation and explanation are performed in the form of an antenna using IFA.
  • IFA inverted F antenna
  • PIFA planar inverted F antenna
  • the multi-input multi-output antenna system of the communication terminal not only satisfies the requirements of the current communication network, but also realizes the layout of the medium-high frequency communication band and the 4*4 MIMO antenna of the Wi-Fi band, and the system isolation is optimized. .
  • the positional relationship between the MIMO antennas can form a better complementary pattern, and the MIMO antenna system has significant revenue.
  • the upper hemisphere ratio of the GPS antenna and the Wi-Fi antenna is generally close to 60%, and good multi-carrier aggregation performance can be achieved in the LTE communication band. It can be understood that the multiple input multiple output antenna system can be applied to a variety of compact terminals, and the number of slots formed on the metal frame is at least four.

Abstract

本发明实施例公开一种通信终端，包括多输入多输出天线系统，该多输入多输出天线系统包括第一天线模块、第二天线模块和第一接地结构；所述第一天线模块包括第一辐射体和第二辐射体，第一辐射体和第二辐射体之间开设第一缝隙；所述第二天线模块包括第三辐射体和第四辐射体，第二辐射体与第三辐射体相连，第一辐射体用于形成第一MIMO天线，第二辐射体用于形成GPS天线，第三辐射体用于形成第一低频通信天线，第四辐射体用于形成第二MIMO天线；第一接地结构一端与第二辐射体和第三辐射体中的至少一个连接，另一端连接至通信终端的接地面，用于增加第一天线模块和第二天线模块之间的隔离度。所述通信终端可以有效改善天线模块之间的隔离度。

Description

通信终端 技术领域
本发明涉及通信技术领域，尤其涉及一种包括多输入多输出天线系统的通信终端。
背景技术
随着移动通信技术的发展，多输入多输出(Multi-input Multi-output，MIMO)天线技术在终端上的需求越来越高，MIMO天线的数量和频段也越来越多，目前已从2*2的天线系统逐渐发展到4*4的天线系统，这对金属机身终端的天线设计带来了严峻的挑战。金属工业设计(Industrial Design，ID)的终端(如手机)一般要求很高的结构紧凑性以及金属占比度，在加入MIMO天线后，一方面压缩了原有通信天线的空间，另一方面MIMO天线频段往往和原有通信天线频段相同，导致天线系统的隔离度恶化。更重要的是，MIMO天线的传输特性对天线方向图提出了很高的要求，需要各天线之间的方向图能够互补。
发明内容
本发明实施例提供一种包括多输入多输出天线系统的通信终端，以通过天线的模块化设计，增加多天线之间的隔离度，提升多天线方向图之间的互补性，改善天线系统辐射性能。
本发明实施例提供一种通信终端，包括多输入多输出天线系统，多输入多输出天线系统包括第一天线模块、第二天线模块和第一接地结构；
第一天线模块包括第一辐射体和第二辐射体，第一辐射体和第二辐射体之间开设第一缝隙；
第二天线模块包括第三辐射体和第四辐射体，第二辐射体与第三辐射体相连，第一辐射体位于第二辐射体相背于第三辐射体的一侧，第四辐射体位于第三辐射体相背于第二辐射体的一侧；
第一辐射体用于形成第一MIMO天线，第二辐射体用于形成GPS天线， 第三辐射体用于形成第一低频通信天线，第四辐射体用于形成第二MIMO天线；
第一接地结构一端与第二辐射体和第三辐射体中至少一个连接，另一端连接至通信终端的至少一个接地面，用于增加第一天线模块和第二天线模块之间的隔离度。
在本实施例中，通过在第一天线模块和第二天线模块之间设置第一接地结构，可以有效增加第一MIMO天线和第二MIMO天线之间的隔离度；同时，通过在第一辐射体和第二辐射体之间开设第一缝隙，可以有效增加第一天线模块的频率覆盖范围，并可以保证第一辐射体与第四辐射体之间至少相隔一个缝隙，有利于进一步改善多输入多输出天线系统的隔离度。
在一种实施方式中，第一天线模块还包括第一馈电端口和第二馈电端口，第一馈电端口与第一辐射体连接，用于馈入第一信号源，并与第一辐射体共同形成第一MIMO天线，第二馈电端口与第二辐射体连接，用于馈入第二信号源，并与第二辐射体共同形成GPS天线。
在本实施方式中，通过设置第一馈电端口和第二馈电端口，从而在第一天线模块内部形成多馈天线形态，进而可以将GPS频段与其他频段拆分，有利于降低整个天线系统的设计难度，并可以改善GPS天线的方向性。
在一种实施方式中，第一天线模块还包括第一带通滤波器，第一带通滤波器与第二馈电端口并联，用于增加第一辐射体和第二辐射体之间的隔离度。
在本实施方式中，通过在第二馈电端口上并联第一带通滤波器，从而可以进一步改善第一MIMO天线和GPS天线之间的隔离度。
在一种实施方式中，第二天线模块还包括第三馈电端口和第四馈电端口，第三馈电端口与第三辐射体连接，用于馈入第三信号源，并与第三辐射体共同形成第一低频通信天线，第四馈电端口与第四辐射体连接，用于馈入第四信号源，并与第四辐射体共同形成第二MIMO天线，第三辐射体和第四辐射体之间开设第二缝隙，用于增加第三辐射体和第四辐射体之间的隔离度。
在本实施方式中，通过设置第三馈电端口和第四馈电端口，从而在第二天线模块内部形成多馈天线形态，有利于降低整个天线系统的设计难度；同时，通过第四辐射体形成第二MIMO天线，使其在空间位置上与第一MIMO天线 相距较远，有利于改善MIMO天线系统的隔离度。
在一种实施方式中，第二天线模块还包括第二带通滤波器，第二带通滤波器与第三馈电端口并联，用于增加第三辐射体和第四辐射体之间的隔离度。
在本实施方式中，通过在第三馈电端口上并联第二带通滤波器，从而可以进一步改善第一低频通信天线和第二MIMO天线之间的隔离度。
在一种实施方式中，第一接地结构的另一端同时与通信终端的至少两个接地面连接，以在第一天线模块和第二天线模块之间形成立体的隔离结构，其中，至少两个接地面包括通信终端的前壳接地面、后壳接地面及射频参考接地面中的至少两者。
在本实施方式中，通过将第一接地结构的另一端与通信终端的前壳接地面、后壳接地面及射频参考接地面中的至少两者连接，从而在第一天线模块和第二天线模块之间形成立体的隔离结构，有利于进一步提升第一接地结构的隔离效果。
在一种实施方式中，多输入多输出天线系统还包括第三天线模块、第四天线模块和第二接地结构；
第三天线模块包括第五辐射体和第六辐射体，第五辐射体和第六辐射体之间开设第三缝隙；
第四天线模块包括第七辐射体和第八辐射体，第六辐射体与第七辐射体相连，第五辐射体位于第六辐射体相背于第七辐射体的一侧，第八辐射体位于第七辐射体相背于第六辐射体的一侧；
第五辐射体及第六辐射体用于形成第三MIMO天线，第七辐射体用于形成第二低频通信天线，第八辐射体用于形成第四MIMO天线；
第二接地结构一端与第六辐射体和第七辐射体中至少一个连接，另一端连接至通信终端的至少一个接地面，用于提升第三天线模块和第四天线模块之间的隔离度。
在本实施方式中，通过在第三天线模块和第四天线模块之间设置第二接地结构，可以有效增加第三MIMO天线和第四MIMO天线之间的隔离度；同时，通过在第五辐射体和第六辐射体之间开设第三缝隙，可以保证第五辐射体与第八辐射体之间至少相隔一个缝隙，有利于进一步改善多输入多输出天线系统的 隔离度。
在一种实施方式中，第三天线模块还包括第五馈电端口，第五馈电端口与第五辐射体连接，用于馈入第五信号源，并与第五辐射体及第六辐射体共同形成第三MIMO天线，其中，第六辐射体通过第三缝隙与第五辐射体耦合。
在本实施方式中，由于通信终端的底端不包含GPS频段，因而将第三天线模块设置为单馈天线形态，并将第六辐射体设置为耦合枝节，有利于降低整个天线系统的设计难度。
在一种实施方式中，第四天线模块还包括第六馈电端口和第七馈电端口，第六馈电端口与第七辐射体连接，用于馈入第六信号源，并与第七辐射体共同形成第二低频通信天线，第七馈电端口与第八辐射体连接，用于馈入第七信号源，并与第八辐射体共同形成第四MIMO天线，第七辐射体和第八辐射体之间开设第四缝隙，用于增加第七辐射体和第八辐射体之间的隔离度。
在本实施方式中，通过设置第六馈电端口和第七馈电端口，从而在第四天线模块内部形成多馈天线形态，有利于降低整个天线系统的设计难度；同时，通过第八辐射体形成第四MIMO天线，使其在空间位置上与第三MIMO天线相距较远，有利于改善MIMO天线系统的隔离度。
在一种实施方式中，第四天线模块还包括第三带通滤波器，第三带通滤波器与第六馈电端口并联，用于增加第七辐射体和第八辐射体之间的隔离度。
在本实施方式中，通过在第六馈电端口上并联第三带通滤波器，从而可以进一步改善第二低频通信天线和第四MIMO天线之间的隔离度。
在一种实施方式中，第二接地结构的另一端同时与通信终端的至少两个接地面连接，以在第三天线模块和第四天线模块之间形成立体的隔离结构，其中，至少两个接地面为通信终端的前壳接地面、后壳接地面及射频参考接地面中的至少两者。
在本实施方式中，通过将第二接地结构的另一端与通信终端的前壳接地面、后壳接地面及射频参考接地面中的至少两者连接，从而在第三天线模块和第四天线模块之间形成立体的隔离结构，有利于进一步提升第二接地结构的隔离效果。
在一种实施方式中，通信终端还包括金属边框，金属边框包括顶端金属边 框、底端金属边框、第一侧金属边框和第二侧金属边框，顶端金属边框与底端金属边框相对设置，第一侧金属边框和第二侧金属边框分别与顶端金属边框和底端金属边框两端连接，第一辐射体至第八辐射体分别为金属边框的一部分。
在一种实施方式中，第一辐射体为通信终端的部分顶端金属边框及部分第一侧金属边框，第二辐射体及第三辐射体为通信终端的部分顶端金属边框，第四辐射体为通信终端的部分顶端金属边框及部分第二侧金属边框，作为第一辐射体的部分第一侧金属边框与其余的第一侧金属边框之间开设第五缝隙，作为第四辐射体的部分第二侧金属边框与其余的第二侧金属边框之间开设第六缝隙。
在一种实施方式中，第五辐射体为通信终端的部分底端金属边框及部分第二侧金属边框，六辐射体及第七辐射体为通信终端的部分底端金属边框，第八辐射体为通信终端的部分底端金属边框及部分第一侧金属边框，作为第五辐射体的部分第二侧金属边框与其余的第二侧金属边框之间开设第七缝隙，作为第八辐射体的部分第一侧金属边框与其余的第一侧金属边框之间开设第八缝隙。
在一种实施方式中，第一辐射体为通信终端的部分第一侧金属边框，第二辐射体为通信终端的部分顶端金属边框及部分第一侧金属边框，第三辐射体为通信终端的部分顶端金属边框及部分第二侧金属边框，第四辐射体为通信终端的部分第二侧金属边框。
在一种实施方式中，第五辐射体为通信终端的部分第二侧金属边框，第六辐射体为通信终端的部分底端金属边框及部分第二侧金属边框，第七辐射体为通信终端的部分底端金属边框及部分第一侧金属边框，第八辐射体为通信终端的部分第一侧金属边框。
通过将通信终端的部分金属边框作为多输入多输出天线系统的各天线模块的辐射体，有利于提升天线系统的辐射性能；同时，通过灵活设置金属边框上的缝隙的开设位置，可以在保证天线辐射性能的同时，实现不同需求的外观设计，有利于提升通信终端的产品品质。
在一种实施方式中，第一低频通信模式天线覆盖的频段至少包括700MHz-960MHz，mimo第一MIMO天线和第二MIMO天线覆盖的频段至少包括1700MHz-2700MHz。
在一种实施方式中，在第一方面第十七种可能的实现方式中，第二低频通信天线覆盖的频段至少包括700MHz-960MHz，第三MIMO天线和第四MIMO天线覆盖的频段至少包括1700MHz-2700MHz。
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。
图1是本发明实施例提供的通信终端的第一结构示意图；
图2是本发明实施例提供的通信终端的顶端天线系统的第一结构示意图；
图3是本发明实施例提供的通信终端的顶端天线系统的接地结构的第一结构示意图；
图4是本发明实施例提供的通信终端的顶端天线系统的接地结构的第二结构示意图；
图5是本发明实施例提供的通信终端的顶端天线系统的第二结构示意图；
图6是本发明实施例提供的通信终端的顶端天线系统的第三结构示意图；
图7是本发明实施例提供的通信终端的顶端天线系统的第四结构示意图；
图8是本发明实施例提供的通信终端的底端天线系统的第一结构示意图；
图9是本发明实施例提供的通信终端的底端天线系统的第二结构示意图；
图10是本发明实施例提供的通信终端的底端天线系统的第三结构示意图；
图11是本发明实施例提供的通信终端的第二结构示意图；
图12是本发明实施例提供的通信终端的第三结构示意图；
图13是本发明实施例提供的通信终端的第四结构示意图；
图14是本发明实施例提供的通信终端的第五结构示意图；
图15是本发明实施例提供的通信终端的第六结构示意图；
图16是本发明实施例提供的通信终端的第七结构示意图；
图17是本发明实施例提供的通信终端的顶端天线系统的反射系数曲线示意图；
图18是本发明实施例提供的通信终端的顶端天线系统的传输系数曲线示意图；
图19是本发明实施例提供的通信终端的顶端天线系统的Wi-Fi及GPS天线的方向图；
图20是本发明实施例提供的通信终端的顶端天线系统的MIMO1天线及MIMO2天线的方向图；
图21是本发明实施例提供的通信终端的底端天线系统的反射系数曲线示意图；
图22是本发明实施例提供的通信终端的底端天线系统的传输系数曲线示意图；
图23是本发明实施例提供的通信终端的底端天线系统的MIMO3天线及MIMO4天线的方向图。
具体实施方式
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描述。
本发明实施例提供一种具有新型多输入多输出天线系统布局设计的通信终端，在金属工业设计(Industrial Design，ID)的通信终端上实现了较好的多输入多输出(Multi-input Multi-output，MIMO)天线系统性能，并且全球定位系统(Global Positioning System，GPS)、Wi-Fi天线的方向性以及LTE频段的多载波聚合(Carrier Aggregation，CA)性能也得到了优化。
一方面，通过天线模块化设计，如将通信终端的顶部金属边框分割成两个天线模块(GPS和/或Wi-Fi天线模块和通信天线模块)，并将相同频段的MIMO天线设计于不同的天线模块中，保证MIMO天线之间至少相隔一个开槽缝隙；同时，通过在两个天线模块的相邻处设计接地结构，进一步改善MIMO天线之间的隔离度；由于MIMO天线在接地结构两侧的位置关系，从而能够实现较好的方向图互补。
另一方面，在天线模块内部，MIMO天线可以与原通信天线或GPS/Wi-Fi天线组合成单馈天线，也可以设计为多馈天线。由于单馈天线的设计难度一般较大，因而可以将一些特殊频段(GPS或者低频通信频段)拆分出来，在天线模块内部形成多馈天线系统，从而能够降低每个天线的设计难度，改善GPS 以及Wi-Fi天线的方向性，同时对长期演进(Long-Term Evolution，LTE)通信下的多CA性能有所帮助。此外，由于多馈天线之间的工作频段不会重叠，有利于改善和优化天线之间的隔离度。
可以理解，本发明实施例提供的技术方案可应用于目前通信终端采用的各种通信系统，例如：GSM、CDMA、WCDMA、GPRS、LTE、LTE-A、UMTS等，以下实施例中的技术方案不限定通信网络的需求，仅以频段高低说明天线的工作特性。本发明实施例可应用在多种ID的通信终端上，在实施例描述中主要以顶部和底部金属边框上具有双开槽缝隙的金属ID通信终端进行说明。
请参阅图1，在本发明一个实施例中，提供一种通信终端100，包括金属边框101和后壳接地面102，所述金属边框101包括顶端金属边框1011、底端金属边框1012、第一侧金属边框1013和第二侧金属边框1014，所述顶端金属边框1011与所述底端金属边框1012相对设置，所述第一侧金属边框1013分别与所述顶端金属边框1011和所述底端金属边框1012的一端呈圆角连接，所述第二侧金属边框1014分别与所述顶端金属边框1011和所述底端金属边框1012另一端呈圆角连接，从而共同形成一圆角矩形区域。所述后壳接地面102设置于所述圆角矩形区域内，并分别与所述第一侧金属边框1012和第二侧金属边框1014连接。可以理解，所述后壳接地面102可以为所述通信终端100的金属背壳。
所述顶端金属边框1011在靠近其两端的圆角附近分别开设有第一缝隙S1和第二缝隙S2，所述底端金属边框1012在靠近其两端的圆角附近分别开设有第三缝隙S3和第四缝隙S4。其中，所述第一缝隙S1、第二缝隙S2、第三缝隙S3及第四缝隙S4在所述金属边框101上呈顺时针方向分布。可以理解，在实际应用时，所述第一缝隙S1、第二缝隙S2、第三缝隙S3及第四缝隙S4的位置可以根据需要改变，所述各缝隙内可以采用非导电材料(例如塑胶)填充，以保证所述金属边框101在外观上的完整性。
请参阅图2，所述通信终端100还包括多输入多输出天线系统10，所述多输入多输出天线系统10包括第一天线模块11、第二天线模块12和第一接地结构13；
所述第一天线模块11包括第一辐射体111和第二辐射体112，所述第一辐 射体111和所述第二辐射体112之间开设第一缝隙S1；
所述第二天线模块12包括第三辐射体121和第四辐射体122，所述第三辐射体121和所述第四辐射体122之间开设第二缝隙S2；
所述第二辐射体112与所述第三辐射体121相连，所述第一辐射体111位于所述第二辐射体112相背于所述第三辐射体121的一侧，所述第四辐射体122位于所述第三辐射体121相背于所述第二辐射体112的一侧；
所述第一辐射体111用于形成第一MIMO天线，所述第二辐射体112用于形成GPS天线，所述第三辐射体121用于形成第一低频通信天线，所述第四辐射体122用于形成第二MIMO天线；
所述第一接地结构13的一端与所述第二辐射体112和所述第三辐射体121的至少一个连接，所述第一接地结构13的另一端可以连接至所述通信终端100的至少一个接地面，例如，所述第一接地结构13的另一端可以连接至所述通信终端100的前壳接地面(图未示)、后壳接地面102及射频参考接地面(图未示)中的任意一个或多个。当所述第一接地结构13的另一端同时与所述通信终端100的至少两个接地面连接时，可以在所述第一天线模块11和所述第二天线模块12之间形成立体的隔离结构，从而增加所述第一天线模块11和所述第二天线模块12之间的隔离度。
请参阅图3和图4，所述第一接地结构13可以包括一个金属片体131(如图3)或多个金属片体131(如图4)。若所述第一接地结构13包括多个金属片体131，所述多个金属片体131可以平行于所述通信终端100的后壳接地面102设置，并在垂直于所述后壳接地面102的方向上相互对齐并保留一定间隔。具体地，所述多个金属片体131的一端可以与所述第二辐射体112和所述第三辐射体121的至少一个连接，所述多个金属片体131的另一端分别一对一连接至所述通信终端100的多个接地面，且所述多个金属片体131与所述多个接地面连接的一端还可以通过金属弹片133相互连接，从而形成立体的隔离结构，进一步提升隔离效果。
所述通信终端100可以为手机、平板电脑等。所述第一天线模块11及所述第二天线模块12均位于所述通信终端100的顶端，所述第一接地结构13可以位于所述第一天线模块11和所述第二天线模块12之间，如图2所示；也 可以位于所述第一天线模块11或所述第二天线模块12内部，如图5所示，通过将第一接地结构13设置于所述第一缝隙S1的边缘位置，并将第三辐射体121靠近所述第一接地结构13的部分复用为第二辐射体112，从而使得所述接地结构13位于所述第一天线模块11内部。此外，所述第一天线模块11及所述第二天线模块12在所述通信终端100顶端的排布也可以互换，如图6所示。在本实施例中，所述第一辐射体111、第二辐射体112、第三辐射体121和第四辐射体122为所述金属边框101的一部分。可以理解，所述第一辐射体111、第二辐射体112、第三辐射体121和第四辐射体122也可以为内置于所述通信终端100顶端内的独立辐射体，或者部分为所述金属边框101，部分为独立辐射体。
请参阅图7，在一种实施方式中，所述第一天线模块11还包括第一馈电端口port1和第二馈电端口port2，所述第一馈电端口port1与所述第一辐射体111连接，用于馈入第一信号源，并与所述第一辐射体111共同形成第一MIMO天线；所述第二馈电端口port2与所述第二辐射体112连接，用于馈入第二信号源，并与所述第二辐射体112共同形成GPS天线。所述第二天线模块12还包括第三馈电端口port3和第四馈电端口port4，所述第三馈电端口port3与所述第三辐射体121连接，用于馈入第三信号源，并与所述第三辐射体121共同形成第一低频通信天线；所述第四馈电端口port4与所述第四辐射体122连接，用于馈入第四信号源，并与所述第四辐射体122共同形成第二MIMO天线。
具体地，将所述通信终端100顶端的天线划分为第一天线模块11和第二天线模块12之后，各模块内部的天线可设计为单馈或多馈天线。请参阅图7，在一种实施方式中，所述第一天线模块11覆盖的天线频段包括GPS和第一MIMO天线MIMO1频段(例如，至少可包含1700MHz-2700MHz范围内的Wi-Fi以及中高频通信频段)。若将所述第一天线模块11设计为多馈天线，由于GPS频段较低，且功能上区别于其他通信频段，因此可以利用所述接地结构结合第二辐射体112单独馈电来实现GPS频段的覆盖；相应地，可以利用所述接地结构结合第一辐射体111单独馈电来实现MIMO1频段的覆盖。所述第二天线模块12覆盖的天线频段包括第一低频通信频段LB1(例如，至少可包含700MHz-960MHz范围内的LTE低频通信频段)和第二MIMO天线 MIMO2频段(例如，至少可包含1700MHz-2700MHz范围内的Wi-Fi以及中高频通信频段)。若将所述第二天线模块12设计为多馈天线，可以利用所述第三辐射体121单独馈电来实现LB1频段的覆盖；相应地，可以利用所述第四辐射体122单独馈电来实现MIMO2频段的覆盖。如此，由于增加了MIMO1和MIMO2之间的空间距离，有利于改善多输入多输出天线之间的隔离度及方向图的互补性。
请参阅图7，在一种实施方式中，所述第一天线模块11还包括第一带通滤波器F1，所述第一带通滤波器F1与所述第二馈电端口port2并联，用于增加所述第一辐射体111和所述第二辐射体112之间的隔离度。所述第二天线模块12还包括第二带通滤波器F2，所述第二带通滤波器F2与所述第三馈电端口port3并联，用于增加所述第三辐射体121和所述第四辐射体122之间的隔离度。
通过在所述GPS天线的馈电端口port2处并联一个工作在通信频段中频(如2GHz)的第一带通滤波器F1，用于滤除第一MIMO天线通过所述第一缝隙S1耦合至所述GPS天线上的中频信号，可进一步改善GPS天线和MIMO1之间的隔离度；同样，在第一低频通信天线的馈点端口port3处并联一个工作在通信频段中频(如1.8GHz)的第二带通滤波器F2，用于滤除第二MIMO天线通过所述第二缝隙S2耦合至所述第一低频通信天线上的中频信号，可进一步改善第一低频通信天线与MIMO2之间的隔离度。可以理解，这种改善模块内部天线之间隔离度的方法并不限于通过上文所述的增加滤波器来实现。
请参阅图8，在一种实施方式中，所述多输入多输出天线系统10还包括第三天线模块14、第四天线模块15和第二接地结构16；
所述第三天线模块14包括第五辐射体141和第六辐射体142，所述第五辐射体141和所述第六辐射体142之间开设第三缝隙S3；
所述第四天线模块15包括第七辐射体151和第八辐射体152，所述第六辐射体142与所述第七辐射体151相连，所述第五辐射体141位于所述第六辐射体142相背于所述第七辐射体151的一侧，所述第八辐射体152位于所述第七辐射体151相背于所述第六辐射体142的一侧；
所述第五辐射体141及所述第六辐射体142用于形成第三MIMO天线， 所述第七辐射体151用于形成第二低频通信天线，所述第八辐射体152用于形成第四MIMO天线；
所述第二接地结构16的一端与所述第六辐射体142和所述第七辐射体151中的至少一个连接，所述第二接地结构16的另一端可以连接至所述通信终端100的至少一个接地面，例如，所述第二接地结构16的另一端可以连接至所述通信终端100的前壳接地面(图未示)、后壳接地面102及射频参考接地面(图未示)中的任意一个或多个。当所述第二接地结构16的另一端同时与所述通信终端100的至少两个接地面连接时，可以在所述第三天线模块14和所述第四天线模块15之间形成立体的隔离结构，从而增加所述第三天线模块14和所述第四天线模块15之间的隔离度。可以理解，所述第二接地结构16的具体结构及连接方式可以参考图3和图4实施例中对所述第一接地结构13的描述，此处不再赘述。
所述第三天线模块14和所述第四天线模块15位于所述通信终端100的底端，所述第二接地结构16可以位于所述第三天线模块14和所述第四天线模块15之间，也可以位于所述第三天线模块14或所述第四天线模块15内部接地结构，具体可以参照关于所述第一接地结构13的位置的相关描述，此处不再赘述。此外，所述第三天线模块14和所述第四天线模块15在所述通信终端100底端的排布也可以互换。在本实施例中，所述第五辐射体141、第六辐射体142、第七辐射体151和第八辐射体152为所述金属边框101的一部分。可以理解，所述第五辐射体141、第六辐射体142、第七辐射体151和第八辐射体152也可以为内置于所述通信终端100底端内的独立辐射体，或者部分为所述金属边框101，部分为独立辐射体。
请参阅图10，在一种实施方式中，所述第三天线模块14还包括第五馈电端口port5，所述第五馈电端口port5与所述第五辐射体141连接，用于馈入第五信号源，并与所述第五辐射体141及所述第六辐射体142共同形成第三MIMO天线，其中，所述第六辐射体142通过所述第三缝隙S3与所述第五辐射体141耦合。所述第四天线模块15还包括第六馈电端口port6和第七馈电端口port7，所述第六馈电端口port6与所述第七辐射体151连接，用于馈入第六信号源，并与所述第七辐射体151共同形成第二低频通信天线，所述第七馈电 端口port7与所述第八辐射体152连接，用于馈入第七信号源，并与所述第八辐射体152共同形成第四MIMO天线。
在实现所述通信终端100的底部天线系统时，和顶部天线系统的设计方法类似，利用所述第二接地结构将16所述通信终端100的底部天线系统分成两个天线模块：第三天线模块14、第四天线模块15。由于底部天线不包含GPS频段，其模块内部的天线设计相比顶部天线更为简便。在本实施例中，第三天线模块14可以覆盖的天线频段包括第三MIMO天线MIMO3频段(例如，至少可包含1700MHz-2700MHz范围内的Wi-Fi以及中高频通信频段)；第四天线模块15可以覆盖的天线频段包括：第二低频通信频段LB2(例如，至少可包含700MHz-960MHz范围内的LTE低频通信频段)和第四MIMO天线MIMO4频段(例如，至少可包含1700MHz-2700MHz范围内的Wi-Fi以及中高频通信频段)。具体地，第三天线模块14可设计为单馈天线，即利用所述第三缝隙S3相对于所述第二接地结构16一侧的第五辐射体141单独馈电，并利用所述第六辐射体142作为天线耦合单元来实现MIMO3频段的覆盖。第四天线模块15可采用类似第二天线模块12的设计方法，即将LB2和MIMO4设计为多馈天线，具体如图10所示。
请参阅图10，在一种实施方式中，所述第四天线模块15还包括第三带通滤波器F3，所述第三带通滤波器F3与所述第六馈电端口port6并联，用于滤除所述第四MIMO天线通过所述第四缝隙S4耦合至所述第二低频通信天线上的中频信号，从而增加所述第七辐射体151和所述第八辐射体152之间的隔离度。可以理解，通过在所述第六馈电端口port6处并联一个工作在通信频段中频(如1.8GHz)的第三带通滤波器F3，可进一步改善第二低频通信天线与MIMO4之间的隔离度。
在本发明实施例中，通过上述设计方法构成的多输入多输出天线系统10，可实现中高频通信频段以及Wi-Fi频段的4*4MIMO天线布局。同时，通过采用多馈天线的方式，相比传统方案，GPS和Wi-Fi天线的方向性以及通信频段(如LTE B3+B7+B20)的多载波聚合性能也得到了提升和优化。
可以理解，除了上述实施例中描述的具有开窗结构及金属边框的通信终端100，本发明实施例提供的多输入多输出天线系统10还可以应用在其他以金属 外观结构实现天线辐射体的通信终端中。例如：金属边框加玻璃背壳结构(如图11)，上下U型槽的金属边框结构(如图12)，以及上述几种金属边框结构的组合(如图13)等。此外，应用本发明实施例提供的多输入多输出天线系统10的通信终端的金属边框上的缝隙的开设位置也可以根据频段覆盖及外观设计的需求而采用不同的方案，例如两个天线模块均拆分为双馈天线，则可在金属边框的顶面和侧面各开设两个缝隙，如图14，即除了图4所示的S1、S2及图8所示的S3及S4，还可以包括分别位于靠近通信终端顶端的两侧金属边框上的S5、S6及分别位于靠近通信终端底端的两侧金属边框上的S7、S8。可选地，如果通信天线模块作为单馈天线设计，则可尽在通信终端的顶端金属边框和一侧的金属边框上分别开设一个缝隙，如图15所示。可以理解，本发明实施例提供的多输入多输出天线系统10显然也可以应用在以部分金属外观结构(即通信终端的金属边框)作为天线辐射体的设计或者完全不以金属外观结构作为天线辐射体的设计中。例如，将图7中的第一MIMO天线和第二MIMO天线部分以金属外观结构实现，GPS天线和第一低频通信天线全部利用金属外观结构实现，则可以实现类似只开侧缝的金属边框设计，如图16所示。可以理解，以上举例仅为说明金属边框上缝隙位置设计的多样性，并不对金属边框上缝隙的位置构成任何限制。
若采用图14中所示的金属边框设计，则所述第一辐射体111为所述通信终端的部分顶端金属边框1011及部分第一侧金属边框1013，所述第二辐射体112及所述第三辐射体121为所述通信终端的部分顶端金属边框1011，所述第四辐射体122为所述通信终端的部分顶端金属边框1011及部分第二侧金属边框1014，作为所述第一辐射体111的部分第一侧金属边框1013与其余的第一侧金属边框1013之间开设第五缝隙S5，作为所述第四辐射体122的部分第二侧金属边框1014与其余的第二侧金属边框1014之间开设第六缝隙S6。
所述第五辐射体141为所述通信终端的部分底端金属边框1012及部分第二侧金属边框1014，所述六辐射体142及所述第七辐射体151为所述通信终端的部分底端金属边框1012，所述第八辐射体152为所述通信终端的部分底端金属边框1012及部分第一侧金属边框1013，作为所述第五辐射体141的部分第二侧金属边框1014与其余的第二侧金属边框1014之间开设第七缝隙S7， 作为所述第八辐射体152的部分第一侧金属边框1013与其余的第一侧金属边框1013之间开设第八缝隙S8。可以理解，若采用图11、图12、图13及图15所示金属边框设计，所述多输入多输出天线系统10的各辐射体的布局与采用图14中所示的金属边框设计时类似，此处不再赘述。
若采用图16所示的金属边框设计，则所述第一辐射体111为所述通信终端的部分第一侧金属边框1013，所述第二辐射体112为所述通信终端的部分顶端金属边框1011及部分第一侧金属边框1013，所述第三辐射体121为所述通信终端的部分顶端金属边框1011及部分第二侧金属边框1014，所述第四辐射体122为所述通信终端的部分第二侧金属边框1014。
所述第五辐射体141为所述通信终端的部分第二侧金属边框1014，所述第六辐射体142为所述通信终端的部分底端金属边框1012及部分第二侧金属边框1014，所述第七辐射体151为所述通信终端的部分底端金属边框1012及部分第一侧金属边框1013，所述第八辐射体152为所述通信终端的部分第一侧金属边框1013。
请参阅图17，针对图7所示的位于所述通信终端100的顶端的第一天线模块11及第二天线模块12，对所述第一馈电端口port1、第二馈电端口port2、第三馈电端口port3及第四馈电端口port4仿真得到的天线反射系数分别如图中曲线S11、S22、S33及S44所示，其中port1和port4采用宽带匹配设计，可分别满足LTE B3+LTE B7+Wi-Fi频段MIMO天线的频段需求。图18所示曲线S21、S32、S41、S42、S43分别为各馈电端口之间的传输系数曲线，而S31由于小于-30dB，在图18中并未示出，通过上述传输系数曲线可以反映出天线隔离度均在10dB以上。图19所示为GPS天线和MIMO1天线的方向图，图20所示为顶部两个MIMO天线中LTE B3和B7频段的方向图，从图19和图20中可以看出，GPS和Wi-Fi天线的上半球占比接近60％，且两个MIMO天线的方向图具有很好的互补性。
请参阅图21，针对图10所示的位于所述通信终端100的底端的第三天线模块14和第四天线模块15，对所述第五馈电端口port5、第六馈电端口port6和第七馈电端口port7仿真得到的天线反射系数分别如图中曲线S55、S66及S77所示。其中，port7处的天线采用了宽带匹配设计，port5处的天线通过一 馈电单元和一耦合单元(第六辐射体142)的设计，可分别满足LTE B3+LTE B7+Wi-Fi频段MIMO天线的频段需求。图22所示曲线S65、S75和S76分别为各馈电端口之间的传输系数曲线，反映出天线隔离度均在10dB以上。图23显示了底端两个MIMO天线中LTE B3和B7频段的方向图，从图中可以看出，底端两个MIMO天线的方向图也具有很好的互补性。可以理解，在本发明的实施例中，形成所述各天线模块的天线的具体形态不做任何限制，例如，可以为倒F天线(IFA)、平面倒F天线(PIFA)或环路天线等，在图17至图23所示的仿真实施例中，以采用IFA的天线形态来进行仿真和说明。
本发明实施例提供的通信终端的多输入多输出天线系统，不仅满足了当前的通信网络的需求，而且实现了中高频通信频段以及Wi-Fi频段的4*4MIMO天线布局，系统隔离度得以优化。MIMO天线之间的位置关系能形成较好的方向图互补，MIMO天线系统收益显著。此外，利用天线模块内部的多馈天线设计方法，使得GPS天线以及Wi-Fi天线的上半球占比一般可接近60％，同时在LTE通信频段可实现较好的多载波聚合性能。可以理解，所述多输入多输出天线系统可应用于多种紧凑型终端上，且金属边框上开设的缝隙数目最少仅需4个。
以上所揭露的仅为本发明的较佳实施例而已，当然不能以此来限定本发明之权利范围，本领域普通技术人员可以理解实现上述实施例的全部或部分流程，并依本发明权利要求所作的等同变化，仍属于发明所涵盖的范围。

Claims (18)

  1. 一种通信终端，其特征在于，包括多输入多输出天线系统，所述多输入多输出天线系统包括第一天线模块、第二天线模块和第一接地结构；
    所述第一天线模块包括第一辐射体和第二辐射体，所述第一辐射体和所述第二辐射体之间开设第一缝隙；
    所述第二天线模块包括第三辐射体和第四辐射体，所述第二辐射体与所述第三辐射体相连，所述第一辐射体位于所述第二辐射体相背于所述第三辐射体的一侧，所述第四辐射体位于所述第三辐射体相背于所述第二辐射体的一侧；
    所述第一辐射体用于形成第一MIMO天线，所述第二辐射体用于形成GPS天线，所述第三辐射体用于形成第一低频通信天线，所述第四辐射体用于形成第二MIMO天线；
    所述第一接地结构一端与所述第二辐射体和所述第三辐射体中至少一个连接，另一端连接至所述通信终端的至少一个接地面，用于增加所述第一天线模块和所述第二天线模块之间的隔离度。
  2. 如权利要求1所述的通信终端，其特征在于，所述第一天线模块还包括第一馈电端口和第二馈电端口，所述第一馈电端口与所述第一辐射体连接，用于馈入第一信号源，并与所述第一辐射体共同形成第一MIMO天线，所述第二馈电端口与所述第二辐射体连接，用于馈入第二信号源，并与所述第二辐射体共同形成GPS天线。
  3. 如权利要求2所述的通信终端，其特征在于，所述第一天线模块还包括第一带通滤波器，所述第一带通滤波器与所述第二馈电端口并联，用于增加所述第一辐射体和所述第二辐射体之间的隔离度。
  4. 如权利要求1所述的通信终端，其特征在于，所述第二天线模块还包括第三馈电端口和第四馈电端口，所述第三馈电端口与所述第三辐射体连接，用于馈入第三信号源，并与所述第三辐射体共同形成第一低频通信天线，所述第四馈电端口与所述第四辐射体连接，用于馈入第四信号源，并与所述第四辐 射体共同形成第二MIMO天线，所述第三辐射体和所述第四辐射体之间开设第二缝隙，用于增加所述第三辐射体和所述第四辐射体之间的隔离度。
  5. 如权利要求4所述的通信终端，其特征在于，所述第二天线模块还包括第二带通滤波器，所述第二带通滤波器与所述第三馈电端口并联，用于增加所述第三辐射体和所述第四辐射体之间的隔离度。
  6. 如权利要求1所述的通信终端，其特征在于，所述第一接地结构的另一端同时与所述通信终端的至少两个接地面连接，以在所述第一天线模块和所述第二天线模块之间形成立体的隔离结构，其中，所述至少两个接地面包括所述通信终端的前壳接地面、后壳接地面及射频参考接地面中的至少两者。
  7. 如权利要求1-6任意一项所述的通信终端，其特征在于，所述多输入多输出天线系统还包括第三天线模块、第四天线模块和第二接地结构；
    所述第三天线模块包括第五辐射体和第六辐射体，所述第五辐射体和所述第六辐射体之间开设第三缝隙；
    所述第四天线模块包括第七辐射体和第八辐射体，所述第六辐射体与所述第七辐射体相连，所述第五辐射体位于所述第六辐射体相背于所述第七辐射体的一侧，所述第八辐射体位于所述第七辐射体相背于所述第六辐射体的一侧；
    所述第五辐射体及所述第六辐射体用于形成第三MIMO天线，所述第七辐射体用于形成第二低频通信天线，所述第八辐射体用于形成第四MIMO天线；
    所述第二接地结构一端与所述第六辐射体和所述第七辐射体中至少一个连接，另一端连接至所述通信终端的至少一个接地面，用于提升所述第三天线模块和所述第四天线模块之间的隔离度。
  8. 如权利要求7所述的通信终端，其特征在于，所述第三天线模块还包括第五馈电端口，所述第五馈电端口与所述第五辐射体连接，用于馈入第五信号源，并与所述第五辐射体及所述第六辐射体共同形成第三MIMO天线，其 中，所述第六辐射体通过所述第三缝隙与所述第五辐射体耦合。
  9. 如权利要求7所述的通信终端，其特征在于，所述第四天线模块还包括第六馈电端口和第七馈电端口，所述第六馈电端口与所述第七辐射体连接，用于馈入第六信号源，并与所述第七辐射体共同形成第二低频通信天线，所述第七馈电端口与所述第八辐射体连接，用于馈入第七信号源，并与所述第八辐射体共同形成第四MIMO天线，所述第七辐射体和所述第八辐射体之间开设第四缝隙，用于增加所述第七辐射体和所述第八辐射体之间的隔离度。
  10. 如权利要求9所述的通信终端，其特征在于，所述第四天线模块还包括第三带通滤波器，所述第三带通滤波器与所述第六馈电端口并联，用于增加所述第七辐射体和所述第八辐射体之间的隔离度。
  11. 如权利要求7所述的通信终端，其特征在于，所述第二接地结构的另一端同时与所述通信终端的至少两个接地面连接，以在所述第三天线模块和所述第四天线模块之间形成立体的隔离结构，其中，所述至少两个接地面为所述通信终端的前壳接地面、后壳接地面及射频参考接地面中的至少两者。
  12. 如权利要求1-6、8-11任意一项所述的通信终端，其特征在于，所述通信终端还包括金属边框，所述金属边框包括顶端金属边框、底端金属边框、第一侧金属边框和第二侧金属边框，所述顶端金属边框与所述底端金属边框相对设置，所述第一侧金属边框和所述第二侧金属边框分别与所述顶端金属边框和所述底端金属边框两端连接，所述第一辐射体至所述第八辐射体分别为所述金属边框的一部分。
  13. 如权利要求12所述的通信终端，其特征在于，所述第一辐射体为所述通信终端的部分顶端金属边框及部分第一侧金属边框，所述第二辐射体及所述第三辐射体为所述通信终端的部分顶端金属边框，所述第四辐射体为所述通信终端的部分顶端金属边框及部分第二侧金属边框，作为所述第一辐射体的部 分第一侧金属边框与其余的第一侧金属边框之间开设第五缝隙，作为所述第四辐射体的部分第二侧金属边框与其余的第二侧金属边框之间开设第六缝隙。
  14. 如权利要求12所述的通信终端，其特征在于，所述第五辐射体为所述通信终端的部分底端金属边框及部分第二侧金属边框，所述六辐射体及所述第七辐射体为所述通信终端的部分底端金属边框，所述第八辐射体为所述通信终端的部分底端金属边框及部分第一侧金属边框，作为所述第五辐射体的部分第二侧金属边框与其余的第二侧金属边框之间开设第七缝隙，作为所述第八辐射体的部分第一侧金属边框与其余的第一侧金属边框之间开设第八缝隙。
  15. 如权利要求12所述的通信终端，其特征在于，所述第一辐射体为所述通信终端的部分第一侧金属边框，所述第二辐射体为所述通信终端的部分顶端金属边框及部分第一侧金属边框，所述第三辐射体为所述通信终端的部分顶端金属边框及部分第二侧金属边框，所述第四辐射体为所述通信终端的部分第二侧金属边框。
  16. 如权利要求12所述的通信终端，其特征在于，所述第五辐射体为所述通信终端的部分第二侧金属边框，所述第六辐射体为所述通信终端的部分底端金属边框及部分第二侧金属边框，所述第七辐射体为所述通信终端的部分底端金属边框及部分第一侧金属边框，所述第八辐射体为所述通信终端的部分第一侧金属边框。
  17. 如权利要求1所述的通信终端，其特征在于，所述第一低频通信天线覆盖的频段至少包括700MHz-960MHz，所述第一MIMO天线和所述第二MIMO天线覆盖的频段至少包括1700MHz-2700MHz。
  18. 如权利要求7所述的通信终端，其特征在于，所述第二低频通信天线覆盖的频段至少包括700MHz-960MHz，所述第三MIMO天线和所述第四MIMO天线覆盖的频段至少包括1700MHz-2700MHz。
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