WO2015120624A1 - 一种天线切换系统以及方法 - Google Patents

一种天线切换系统以及方法 Download PDF

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Publication number
WO2015120624A1
WO2015120624A1 PCT/CN2014/072142 CN2014072142W WO2015120624A1 WO 2015120624 A1 WO2015120624 A1 WO 2015120624A1 CN 2014072142 W CN2014072142 W CN 2014072142W WO 2015120624 A1 WO2015120624 A1 WO 2015120624A1
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WO
WIPO (PCT)
Prior art keywords
antenna
radio frequency
switch
circuit
parasitic
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/CN2014/072142
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English (en)
French (fr)
Inventor
徐求良
杨丽萍
张昌峰
陈志君
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huawei Device Co Ltd
Original Assignee
Huawei Device Co Ltd
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 Huawei Device Co Ltd filed Critical Huawei Device Co Ltd
Priority to CN201480006147.XA priority Critical patent/CN105075143B/zh
Priority to EP14882576.3A priority patent/EP3089262B1/en
Priority to KR1020167021841A priority patent/KR101852894B1/ko
Priority to PCT/CN2014/072142 priority patent/WO2015120624A1/zh
Publication of WO2015120624A1 publication Critical patent/WO2015120624A1/zh
Priority to US15/223,845 priority patent/US10090907B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—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
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0802—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection
    • H04B7/0805—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with single receiver and antenna switching
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0602—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using antenna switching
    • 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
    • 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
    • H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/24—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the orientation by switching energy from one active radiating element to another, e.g. for beam switching
    • 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
    • H01Q5/378—Combination of fed elements with parasitic elements
    • 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
    • H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
    • H01Q9/42—Resonant antennas with feed to end of elongated active element, e.g. unipole with folded element, the folded parts being spaced apart a small fraction of the operating wavelength
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
    • H03F3/24—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers of transmitter output stages
    • 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
    • H04B1/44—Transmit/receive switching
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0802—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection
    • H04B7/0825—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with main and with auxiliary or diversity antennas
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/14—Two-way operation using the same type of signal, i.e. duplex
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • 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
    • H04B2001/0408—Circuits with power amplifiers

Definitions

  • the present invention belongs to the field of mobile terminals, and in particular, to an antenna switching system and method.
  • Carrier aggregation (carrier) Aggregation, CA) implementation specifically includes the following two: first, carrier aggregation in the frequency band; second, carrier aggregation in different frequency bands.
  • first carrier aggregation in the frequency band
  • second carrier aggregation in different frequency bands.
  • the RF signal can be received through one main antenna, and different I/Q (in-phase/quadrature) demodulation is implemented for the received RF signal.
  • FIG. 1 is a schematic diagram of an antenna included in a conventional mobile terminal.
  • a frame is selected by using a dotted line.
  • the main antenna 1, the other main antenna 2, the diversity antenna 3, and the parasitic antenna are included. 4; wherein the diversity antenna 3 is used for anti-fading, the parasitic antenna 4 is used for spreading; and in order to meet the needs of carrier aggregation of multiple frequency bands, the main antenna 1 can be used for one frequency band, and the other main antenna 2 can be used for another frequency band.
  • a plurality of antennas have been included in the terminal, and since the mobile terminal is increasingly miniaturized, it is extremely difficult to add an antenna in a limited space of the mobile terminal.
  • An object of the embodiments of the present invention is to provide an antenna switching system and method to solve the problem that the number of paths for receiving or transmitting radio frequency signals in the prior art is limited by the number of main antennas.
  • an antenna switching system includes a radio frequency transceiver circuit, a main antenna, and a parasitic antenna.
  • the main antenna is connected to the radio frequency transceiver circuit, and further includes:
  • a switching circuit configured to connect the parasitic antenna to the radio frequency transceiver circuit when receiving or transmitting a radio frequency signal using the parasitic antenna.
  • the number of the parasitic antennas is P, the P is a positive integer, and the number of the main antennas is M, M is a positive integer;
  • One of the switching circuits is specifically configured to connect one of the parasitic antennas to the radio frequency transceiver circuit to establish K each of the K switching circuits when N channels are required to receive or transmit radio frequency signals of different frequency bands. a connection of the parasitic antenna to the radio frequency transceiver circuit, the N minus the K being the M, the N being a positive integer greater than 1, and the P being greater than or equal to the K.
  • the switching circuit is further configured to:
  • the connection of the parasitic antenna to the radio frequency transceiver circuit is disconnected, and the parasitic antenna is grounded.
  • the switching circuit is specifically used to:
  • the parasitic antenna specified by the switching instruction is connected to the radio frequency transceiver circuit.
  • the switch circuit is specifically configured to:
  • the parasitic antenna is grounded when receiving a main antenna transceiving command transmitted by a modem of the mobile terminal.
  • the switch circuit includes a switch end, and further includes an antenna end connected to the parasitic antenna;
  • the radio frequency transceiver circuit includes: a second duplexer, a second radio frequency power amplifier, and a radio frequency transceiver;
  • a receiving end of the second duplexer is connected to a second code division receiving end of the radio frequency transceiver, and a second code division transmitting end of the radio frequency transceiver is connected in series with one of the second radio frequency
  • the power amplifier is followed by a transmitting end of the second duplexer, and an antenna of the second duplexer is terminated to a switch end of the switching circuit;
  • the switch circuit is further specifically used for:
  • the antenna end of the switch circuit and the switch end connected to the antenna end of the second duplexer specified by the band switch command are closed.
  • the radio frequency transceiver circuit further includes: a fourth radio frequency power amplifier, and a second surface acoustic filter. ;
  • a second time division type transmitting end of the radio frequency transceiver is connected to a switch end of the switch circuit after connecting one of the fourth radio frequency power amplifiers in series;
  • the vibration transmitting end and the receiving end of one of the second surface acoustic filters are respectively connected to one switching end of the switching circuit and a second time division receiving end of the radio frequency transceiver.
  • the switch circuit is further specifically used for:
  • the antenna end of the switch circuit and the vibration transmitting end of the second surface acoustic filter specified by the selective reception command are closed.
  • the radio frequency transceiver circuit further includes: a duplexer, a first RF power amplifier, a third RF power amplifier, a first surface acoustic filter, and a single-pole multi-throw switch;
  • a receiving end of the first duplexer is connected to a first code division receiving end of the radio frequency transceiver, and a first code division transmitting end of the radio frequency transceiver is connected to one of the first radio frequency powers in series
  • An amplifier is followed by a transmitting end of the first duplexer
  • An antenna of one of the first duplexers is terminated with one of the single-pole multi-throw switches, and an antenna of the single-pole multi-throw switch is terminated with the main antenna;
  • a first time division system transmitting end of the radio frequency transceiver is connected to one of the single-pole multi-throw switchers in series with one of the third RF power amplifiers;
  • a vibration transmitting end and a receiving end of the first surface acoustic filter are respectively connected to one of the single-pole multi-throw switch and a first time-division receiving end of the radio frequency transceiver;
  • the single-pole multi-throw switch for closing an antenna end of the single-pole multi-throw switch and a first duplexer specified by the switch command when receiving a switch command sent by a modem of the mobile terminal a switch end connected to the antenna end, or an antenna end of the single-pole multi-throw switch and a switch end connected to the third RF power amplifier specified by the switch command, or an antenna end of the single-pole multi-throw switch a switch terminal connected to the first surface acoustic filter specified by the switch command.
  • the switch circuit is specifically configured to:
  • a parasitic antenna that is not connected to the radio frequency transceiver circuit among the P parasitic antennas is grounded.
  • a second aspect is an antenna switching method, where the antenna switching method includes:
  • the modem of the mobile terminal receives the multiple prompts sent by the base station, the modem generates a switching instruction according to the multiple prompts, and sends the switching instruction to the switch circuit;
  • the switch circuit establishes a connection between the parasitic antenna specified by the switching instruction and the radio frequency transceiver circuit.
  • the antenna switching method includes:
  • the modem of the mobile terminal receives the primary antenna sending and receiving prompt sent by the base station, generating a primary antenna sending and receiving command according to the primary antenna sending and receiving prompt, and sending the primary antenna sending and receiving command to the switch circuit;
  • the switch circuit disconnects the parasitic antenna from the radio frequency transceiver circuit to ground the parasitic antenna.
  • the antenna switching method further includes:
  • the modem of the mobile terminal establishes a connection with the base stations of different frequency bands through the main antenna, receives the broadcast information sent by the base station, determines whether the multi-way prompt is recorded in the broadcast information, and determines the broadcast information. Whether the main antenna is sent or received is indicated.
  • the beneficial effects of the embodiments of the present invention are: by selectively connecting the parasitic antenna to the ground or to the radio frequency transceiver circuit, the parasitic antenna can be used for both spreading and independent transmission for carrier aggregation. Or send an antenna.
  • the effect of increasing the number of channels for receiving or transmitting radio frequency signals is realized by using only the main antenna and the parasitic antenna included in the existing mobile terminal without adding a new antenna.
  • FIG. 1 is a schematic diagram of an antenna in a mobile terminal provided by the background art of the present invention.
  • FIG. 2 is a system architecture diagram of an antenna switching system according to an embodiment of the present invention.
  • FIG. 3 is a specific circuit diagram of an antenna switching system according to an embodiment of the present invention.
  • FIG. 4 is an antenna performance diagram of a main antenna in a switching system including a main antenna and a grounded parasitic antenna according to an embodiment of the present invention
  • FIG. 5 is an antenna performance diagram of a parasitic antenna in an antenna switching system including a main antenna and a parasitic antenna connected to the radio frequency transceiver circuit according to an embodiment of the present invention
  • FIG. 6 is an antenna performance diagram of a main antenna in an antenna switching system including a main antenna and a parasitic antenna connected to the radio frequency transceiver circuit according to an embodiment of the present invention
  • FIG. 7 is a flowchart of a first antenna switching method according to an embodiment of the present invention.
  • FIG. 8 is a flowchart of a second antenna switching method according to an embodiment of the present invention.
  • FIG. 9 is a flowchart of a third antenna switching method according to an embodiment of the present invention.
  • first duplexer In the embodiment of the present invention, "first duplexer”, “first radio frequency power amplifier”, “first code division type receiving end”
  • the "first code division type transmission end”, the “first time division type transmission end”, the “first time division system receiving end”, and the “first surface acoustic filter” include “first” , used only for differentiation.
  • “Second duplexer”, “second RF power amplifier”, “second code division receiving end”, “second code division type transmitting end”, “second time division type transmitting end”, “second time division type” The “second” included in the “receiver” and “second surface acoustic filter” are used for the sake of distinction.
  • the "third” included in the “third RF power amplifier” and the “third surface acoustic filter” are all substitutes and are used only for distinguishing.
  • the “fourth” in the “fourth radio frequency power amplifier” is also referred to as a substitute, and is only used for distinguishing.
  • FIG. 2 shows a system architecture of an antenna switching system according to an embodiment of the present invention. For convenience of description, only parts related to the embodiment of the present invention are shown, which are described in detail below.
  • An antenna switching system includes a radio frequency transceiver circuit 6, a main antenna 1 and a parasitic antenna 4, and the main antenna 1 is connected to the radio frequency transceiver circuit 6, and further includes:
  • the switching circuit 5 is configured to connect the parasitic antenna 4 to the radio frequency transceiver circuit 6 when receiving or transmitting a radio frequency signal using the parasitic antenna 4.
  • the antenna switching system includes one or more primary antennas 1, one or more parasitic antennas 4; wherein one primary antenna 1 can be used to receive or transmit one RF signal.
  • the radio frequency transceiver circuit 6 includes a radio frequency transceiver, and the radio frequency transceiver is connected to a modem of the mobile terminal, and is configured to modulate a baseband signal (low frequency signal) output by the modem to a high frequency carrier through a radio frequency transceiver (carriers in different frequency bands) The frequency of the carrier is different.
  • the radio frequency signal generated by the modulation is transmitted through the main antenna 1 and/or the parasitic antenna 4; in addition, when the main antenna 1 and/or the parasitic antenna 4 receive the radio frequency signal, the radio frequency transceiver circuit 6
  • the RF transceiver demodulates the baseband signal from the received RF signal based on the matched carrier frequency.
  • the radio frequency transceiver circuit 6 can transmit and receive radio frequency signals through the main antenna 1.
  • the main antenna 1 is used to receive or transmit the radio frequency signal
  • the parasitic antenna 4 can be connected to the radio frequency transceiver circuit 6 through the switch circuit 5 to connect the parasitic antenna through the switch circuit 5. 4 and the radio frequency transceiver circuit 6, so that the radio frequency transceiver circuit 6 can receive or transmit the radio frequency signal through the parasitic antenna 4.
  • the main antenna 1 when the CA combines two different frequency bands, the main antenna 1 is used to receive or transmit the radio frequency signal of one of the frequency bands; after the switch circuit 5 is connected to the parasitic antenna 4 and the radio frequency transceiver circuit 6, the The parasitic antenna 4 receives or transmits a radio frequency signal of another frequency band.
  • a plurality of antennas for receiving or transmitting radio frequency signals of different frequency bands may be selected from all the parasitic antennas 4 and/or all the main antennas 1, and further, The modem control switch circuit 5 establishes a connection between the parasitic antenna 4 and the radio frequency transceiver circuit 6, respectively.
  • the switch circuit 5 is established.
  • the parasitic antenna 4 is connected to the radio frequency transceiver circuit 6 and receives a radio frequency signal through a parasitic antenna 4 to receive or transmit the remaining number of channels through one or more parasitic antennas 4 (the remaining number of channels is calculated by calculating the radio frequency to be received)
  • the number of signals is subtracted from the number of main antennas 1 to obtain a radio frequency signal.
  • the number of the parasitic antennas 4 is P, the P is a positive integer, the number of the main antennas 1 is M, and the M is a positive integer;
  • a switching circuit 5 is specifically configured to connect a parasitic antenna 4 with the radio frequency transceiver circuit 6 to establish K parasitic antennas 4 and RF transceiving by using K switching circuits 5 when N channels are required to receive or transmit radio frequency signals of different frequency bands.
  • each switching circuit 5 establishes a connection of the parasitic antenna 4 to the radio frequency transceiver circuit 6. If the modem determines that it is necessary to receive the radio frequency signals of the N frequency bands, the M main antennas 1 are respectively configured to receive the radio frequency signals of the different channels, and the radio frequency signals of the remaining K channels are respectively received by the K parasitic antennas 4; The switching circuit 5 connects the designated K parasitic antennas 4 to the radio frequency transceiver circuit 6, respectively.
  • the switch circuit 5 is further configured to ground the parasitic antenna 4 that is not connected to the radio frequency transceiver circuit 6 among the P parasitic antennas 4.
  • the modem respectively controls the corresponding switching circuit 5 to ground the parasitic antenna 4 not connected to the radio frequency transceiver circuit 6 to maintain
  • the spread spectrum function enables the main antenna 1 and the parasitic antenna 4 connected to the radio frequency transceiver circuit 6 to receive a radio frequency signal of a wider frequency band.
  • the switch circuit 5 is further configured to:
  • the connection of the parasitic antenna 4 to the radio frequency transceiver circuit 6 is disconnected, and the parasitic antenna 4 is grounded.
  • the parasitic antenna 4 when it is not necessary to use the parasitic antenna 4 to receive the radio frequency signal, but only the main antenna 1 is required to receive the radio frequency signal, all the parasitic antennas 4 are grounded; further, the parasitic antenna 4 is still used for spreading, so that the main antenna 1 Capable of receiving RF signals in a wider frequency band.
  • the switch circuit 5 is specifically configured to:
  • the parasitic antenna 4 specified by the switching instruction is connected to the radio frequency transceiver circuit 6.
  • the main antenna 1 receives the radio frequency signal carrying the broadcast information sent by the base station every predetermined time period, and the radio frequency signal carrying the broadcast information is processed by the radio frequency receiving circuit into a baseband signal carrying the broadcast information, and the modem transmits the baseband signal from the baseband signal.
  • the broadcast information is extracted. If the broadcast information records multiple prompts, it means that at least two radio frequency signals combined by the CA are required to be received; meanwhile, different frequency bands combined by the CA are extracted from the multiple prompts to further determine that the mobile terminal needs to receive or send.
  • the number of the radio frequency signals specifically, since each switching circuit 5 can only be connected to one parasitic antenna, the modem generates a switching instruction according to the multi-way prompt, which specifies which parasitic antennas 4 are used, and then receives the switching
  • the commanded switch circuit 5 establishes a connection between the corresponding parasitic antenna 4 and the radio frequency transceiver circuit 6; and further receives the corresponding number of channels by the parasitic antenna 4 specified by the switching instruction (wherein the value of the corresponding path number and the switching instruction are specified
  • the number of parasitic antennas 4 is the same as the number of radio frequency signals.
  • the switch circuit 5 is specifically configured to:
  • the parasitic antenna 4 is grounded when receiving a main antenna transceiving command transmitted by a modem of the mobile terminal.
  • the switch circuit 5 when the switch circuit 5 receives the main antenna transmission and reception command sent by the modem, it means that only the main antenna 1 needs to receive the radio frequency signal; in order to increase the bandwidth of the radio frequency signal that the main antenna 1 can receive, all the parasitic antennas 4 are grounded.
  • FIG. 3 a specific circuit of the antenna switching system provided by the embodiment of the present invention is shown in FIG.
  • the main antenna 1 is selected by a dotted frame
  • the parasitic antenna 4 is also selected by a dotted frame.
  • the RF transceiver circuit 6 is also selected by a dotted frame; wherein the single-pole multi-throw switch 61 adopts a solid wire frame and the solid wire frame.
  • the plurality of switches included therein indicate that the antenna end of the single-pole multi-throw switch 61 (the fixed end of the switch) is connected to the main antenna 1; wherein the switch end of the single-pole multi-throw switch 61 (the throwing end of the switch) is connected
  • the DUP is a first duplexer, wherein the triangular-shaped block connected to the transmitting end of the first duplexer is a first RF power amplifier, wherein the switch is connected to the switch end of the single-pole multi-throw switch 61.
  • the triangular block is a third RF power amplifier, wherein a small long block connected to the switch end of the single-pole multi-throw switch 61 is a first surface acoustic wave filter (SAW).
  • SAW surface acoustic wave filter
  • the switching circuit 5 is represented by a solid line frame containing one or more switches; meanwhile, the DUP connected to one switching end of the switching circuit 5 is a second duplexer, wherein the transmitting end of the second duplexer is connected.
  • the triangular-shaped block is a second RF power amplifier, wherein the triangular-shaped block connected to one switch end of the switch circuit 5 is a fourth RF power amplifier, and is connected to one switch end of the switch circuit 5.
  • a small long box is the second surface acoustic filter.
  • the antenna switching system includes one or more main antennas 1 and one or more parasitic antennas 4; for the sake of illustration, FIG. 3 only provides one main antenna 1 and the radio frequency transceiver circuit 6 a specific circuit connection diagram, and only a specific circuit connection diagram of a switching circuit 5 and a parasitic antenna 4 and a radio frequency transceiver circuit 6 respectively; and, for each parasitic antenna 4, a switching circuit is required. 5 and the RF transceiver circuit 6 can establish a connection. For the sake of illustration, only a specific circuit in which one parasitic antenna 4 is connected to the radio frequency transceiver circuit 6 via a switching circuit 5 will be described below.
  • the connection between the feeding end 12 of the main antenna 1 and the antenna end of the single-pole multi-throw switch 61 is maintained; and according to the working condition of the main antenna 1, whether the main antenna 1 is to be determined
  • the ground terminal 11 is grounded.
  • the parasitic antenna 4 is used for code division multiplexing (for example, using wideband code division multiple access (Wideband) Code Division Multiple Access (WCDMA) communication protocol for multi-channel radio frequency communication)
  • the switch circuit 5 includes one or more switch terminals, and further includes an antenna end connected to the parasitic antenna 4;
  • the radio frequency transceiver circuit 6 includes: one or more second duplexers, one or more second radio frequency power amplifiers, and a radio frequency transceiver;
  • the radio frequency transceiver has one or more second code division receiving ends, and further has one or more second code division type transmitting ends; wherein a receiving end of one of the second duplexers is connected to the radio frequency One of the second code division receiving ends of the transceiver, wherein one of the second code division transmitting ends of the radio frequency transceiver is connected in series with one of the second radio frequency power amplifiers followed by one of the second duplexers End, an antenna of the second duplexer terminates a switch end of the switch circuit 5.
  • the radio frequency transceiver also has one or more interactive terminals that are capable of communicating with the modem.
  • the switch circuit 5 is also specifically used for:
  • the antenna end of the switch circuit 5 and the switch end connected to the antenna end of the second duplexer specified by the band switch command are closed.
  • the switch circuit 5 includes one or more switches, one end of each switch is connected together to form an antenna end of the switch circuit 5, and the other end of one switch is a switch end of the switch circuit 5, That is, the other end of each switch is a switch end of the switch circuit 5, respectively.
  • the antenna end of one switching circuit 5 can be connected to a parasitic antenna 4. Therefore, for each parasitic antenna 4 to which a function of transmitting or receiving a radio frequency signal is added, a switching circuit 5 is required to provide a corresponding antenna end to be connected to the parasitic antenna 4.
  • the switch circuit 5 is a single-pole multi-throw switch, and the common end of the single-pole multi-throw switch is the antenna end of the switch circuit 5, and the other port in each single-pole multi-throw switch (except the single-pole multi-throw switch)
  • the common terminal is the switching terminal of the switching circuit 5, respectively.
  • the mobile terminal receives the broadcast information transmitted by the base station through the primary antenna 1. Further, the modem generates, according to the multiplexed presentation described in the broadcast information, a frequency band in which the plurality of radio frequency signals to be received are respectively received from the plurality of cues indicated by the broadcast information, and generates a switching instruction (which parasitic antenna 4 is specified by the switching instruction) Which frequency band is used to receive or transmit the RF signal).
  • the multiplexer For one of the parasitic antennas 4 specified by the switching instruction, if the multiplexer further specifies that the communication system is code division communication, generating a band switch command and transmitting the band switch command to the switch circuit 5 connected to the parasitic antenna 4, Controlling, by the frequency band switch instruction, the switch circuit 5 to connect the parasitic antenna 4 and the second duplexer; specifically, since the switch end of the different switches included in the switch circuit 5 is connected to the second duplexer of different frequency bands, The band switch command specifies that the parasitic antenna 4 is connected to the corresponding second duplexer in the radio frequency transceiver circuit 6 through a switch corresponding to the frequency band included in the switch circuit 5, and the second duplexer is designated by the designated switch to further specify Which frequency band of the code division communication is received by the radio frequency signal.
  • the parasitic antenna 4 when used to receive the radio frequency signal of the code division communication, the parasitic antenna 4 transmits the received radio frequency signal to the antenna end of the second duplexer; the second duplexer receives the radio frequency signal from the receiving end. Transmitting to a second code division receiving end of the radio frequency transceiver; further, the radio frequency transceiver performs code decomposition on the received radio frequency signal, demodulates the baseband signal, and demodulates the demodulated baseband signal from one or more The interactive end sends to the modem.
  • the radio frequency transceiver after receiving the baseband signal transmitted by the modem, the radio frequency transceiver performs code division modulation on the received baseband signal; meanwhile, the modem has sent a band switch command to the switch circuit 5 to close the designated switch and establish a
  • the parasitic antenna 4 (which is a parasitic antenna 4 connected to the switch circuit 5) is connected to the corresponding second duplexer (same reason, the designation of the second duplexer is realized by a designated switch, thereby specifying which one to transmit The RF signal of the frequency band); further, the RF transceiver performs code division modulation on the baseband signal according to the frequency band specified by the modem, and performs power amplification on the RF signal generated by the code division modulation by the second power amplifier, after passing through the designated duplexer and the designated After the switch, the power amplified RF signal is transmitted to the corresponding parasitic antenna 4 for transmission.
  • the parasitic antenna 4 can also be used for time division multiplex communication (eg, adoption) a multi-channel radio frequency communication of the TD-LTE communication protocol, the radio frequency transceiver circuit 6 further comprising: one or more fourth radio frequency power amplifiers; and one or more second surface acoustic filters;
  • a second time division type transmitting end of the radio frequency transceiver is connected to a switch end of the switch circuit 5 after connecting one of the fourth radio frequency power amplifiers in series;
  • a vibration transmitting end of the second surface acoustic filter is connected to a switching end of the switching circuit 5, a receiving end of the second surface acoustic filter, and a second time division receiving of the radio frequency transceiver End connection.
  • the switch circuit 5 is also specifically used for:
  • the antenna end of the switch circuit 5 and the vibration transmitting end of the second surface acoustic filter specified by the selection reception command are closed.
  • the mobile terminal receives the broadcast information transmitted by the base station through the primary antenna 1. Further, the modem generates a switching command that specifies one or more parasitic antennas 4 based on the multiplexed presentations described in the broadcast information.
  • the modem knows, from the multi-way prompts recorded in the broadcast information, the frequency bands in which the multiple radio frequency signals to be transmitted are respectively located, and if the multi-way prompt further specifies the communication system as the time division
  • the communication generates a selection sending instruction, and the selection transmission control circuit 5 connects the parasitic antenna 4 and the fourth radio frequency power amplifier; specifically, since the switching end of the different switches included in the switching circuit 5 is connected to the fourth of different frequency bands a radio frequency power amplifier, the selection transmission command designating which switch included in the parasitic antenna 4 is connected to the corresponding fourth radio frequency power amplifier in the radio frequency transceiver circuit 6 through the switch included in the switch circuit 5; and designating the fourth radio frequency power amplifier through the designated switch, To further specify which frequency band of the time-division communication is to be transmitted.
  • the modem learns from the multi-way prompts recorded in the broadcast information that the multi-channel radio signals to be received are respectively in the frequency band, and if the multi-way prompt further specifies the communication system as Time-division communication, generating a selection receiving instruction, by which the receiving instruction controls the switching circuit 5 to connect the parasitic antenna 4 and the second surface acoustic filter; specifically, since the switching terminals of the different switches included in the switching circuit 5 are connected to different frequency bands a second acoustic surface filter, the selection receiving instruction specifies which switch included in the parasitic antenna 4 is connected to the corresponding second surface acoustic filter in the radio frequency transceiver circuit 6 through the switch, and realizes the second acoustic surface through the designated switch The designation of the filter further specifies which frequency band of the time-division communication is to be received.
  • the radio frequency transceiver after receiving the baseband signal transmitted by the modem, the radio frequency transceiver performs time division modulation on the received baseband signal; meanwhile, the modem transmits a selective reception instruction to the switch circuit 5 to specify by the selection receiving instruction.
  • the switch establishes the connection of the parasitic antenna 4 to the corresponding second RF power amplifier.
  • the radio frequency transceiver performs time division modulation on the baseband signal according to the frequency band specified by the modem, and transmits the radio frequency signal generated by the time division modulation to the parasitic antenna 4 through the designated second radio frequency power amplifier and the designated switch to transmit.
  • the parasitic antenna 4 when the parasitic antenna 4 is used to receive the time-division communication radio frequency signal, the parasitic antenna 4 transmits the received radio frequency signal to the vibration transmitting end of the second surface acoustic filter; the second surface acoustic filter will receive the radio frequency signal. Filtering, transmitting the filtered RF signal to the second time-division receiving end of the RF transceiver; further, the RF transceiver demodulates the received RF signal, demodulates the baseband signal, and demodulates The baseband signal is sent to the modem.
  • one or more second time division transmitting ends of the radio frequency transceiver may be connected to one switch of the switching circuit 5 after connecting one of the fourth radio frequency power amplifier and the third sound meter filter in series end.
  • the radio frequency signal sent from the second time division system transmitting end of the radio frequency transceiver is denoised and filtered by the third sound table filter.
  • the radio frequency transceiver circuit 6 includes one or more single-pole multi-throw switchers 61 in which each single-pole multi-throw switch 61 is used.
  • the antenna end is externally connected to a main antenna 1.
  • main antenna 1 For convenience of explanation, the following is only a detailed description of the case where one main antenna 1 is externally connected.
  • the radio frequency transceiver circuit 6 further includes: one or more first duplexers, one or more first radio frequency power amplifiers, one or more third radio frequency power amplifiers, and one or more first acoustic surfaces a filter, and a single-pole multi-throw switch 61;
  • a receiving end of the first duplexer is connected to a first code division receiving end of the radio frequency transceiver, and a first code division transmitting end of the radio frequency transceiver is connected to one of the first radio frequency powers in series
  • An amplifier is followed by a transmitting end of the first duplexer
  • An antenna of the first duplexer is terminated to one of the single-pole multi-throw switch 61, and the antenna of the single-pole multi-throw switch 61 is terminated to the main antenna 1;
  • a first time division system transmitting end of the radio frequency transceiver is connected to one of the single-pole multi-throw switch 61 in series with one of the third radio frequency power amplifiers;
  • a vibration transmitting end and a receiving end of the first surface acoustic filter are respectively connected to one of the single-pole multi-throw switch 61 and a first time-division receiving end of the radio frequency transceiver;
  • the single-pole multi-throw switch 61 is configured to close the antenna end of the single-pole multi-throw switch 61 and the specified by the switch command when receiving a switch command sent by the modem of the mobile terminal a switch end of the first duplexer connected to the antenna end, or an antenna end of the single-pole multi-throw switch 61 and a switch end connected to the third RF power amplifier specified by the switch command, or closing the single-pole multi-tool
  • the first duplexer when connected to the main antenna 1 and the radio frequency transceiver circuit 6, is configured to transmit a radio frequency signal of code division communication; wherein, for the different first first duplexers that are made, receive Or the transmitted RF signal is in a different frequency band.
  • the radio frequency transceiver when it is required to use the primary antenna 1 to transmit the radio frequency signal of the code division communication, the radio frequency transceiver sends the modulated radio frequency signal from the first code division transmitting end to the first radio frequency amplifier for power amplification.
  • the first duplexer receives the power amplified RF signal from the transmitting end and transmits the power amplified RF signal from the antenna end to the primary antenna 1 to transmit; when the primary antenna 1 is required to receive the code division communication
  • the first duplexer obtains the radio frequency signal received by the main antenna 1 through the antenna end, and transmits the acquired radio frequency signal to a first code division system of the radio frequency transceiver through the receiving end. Receiving end.
  • the first surface acoustic filter is configured to transmit time-division communication, when connected to the main antenna 1 and the radio frequency transceiver, to transmit the radio frequency signal of the time-division communication received by the main antenna 1 to the radio frequency transceiver; specifically, the main antenna 1
  • the received time-division communication radio frequency signal is filtered, and the filtered radio frequency signal is transmitted to a first time division system receiving end connected to the first surface acoustic filter.
  • the third radio frequency power amplifier is used for time-division communication, and when connected to the main antenna 1 and the radio frequency transceiver, is used for power amplification of the radio frequency signal of the time-division communication sent by the radio frequency transceiver from the first time division system transmitting end, The amplified RF signal is sent to the main antenna 1 for transmission.
  • the switch when the modem receives the multi-way prompt sent by the base station or the main antenna 1 sends and receives the prompt, the switch generates a switch command; if the switch end is connected with the switch end of the first duplexer, the single-pole is closed.
  • the antenna terminal of the multi-throw switch 61 and the switch terminal connected to the antenna end of the first duplexer designated by the switch command realize reception or transmission of a radio frequency signal for code division communication by the main antenna 1.
  • the antenna end of the single-pole multi-throw switch 61 and the switch end connected to the third RF power amplifier specified by the switch command are closed, and the The main antenna 1 performs transmission of a radio frequency signal for time-division communication.
  • one or more first time-division transmitting ends of the radio frequency transceiver may be connected to the single-pole multi-throw switch 61 after connecting one of the third radio frequency power amplifiers and the sound table filter in series. One of the switch ends.
  • the radio frequency signal sent from the first time division system transmitting end of the radio frequency transceiver is denoised and filtered by the sound table filter.
  • FIG. 4 shows the main antenna 1 when the parasitic antenna 4 is grounded in the switching system.
  • FIG. 5 shows an antenna performance diagram of the parasitic antenna 4 when the parasitic antenna 4 in the antenna switching system has been connected to the radio frequency transceiver circuit through the switching circuit 5;
  • FIG. 6 shows that the parasitic antenna 4 in the antenna switching system has been The antenna performance map of the main antenna 1 when the switching circuit 5 is connected to the radio frequency transceiver circuit.
  • the abscissa indicates the frequency in units of gigahertz (GHz); the ordinate indicates the return loss in units of decibels (DB).
  • the main antenna has a small return loss and can receive or transmit one RF signal well.
  • the main antenna 1 and the parasitic antenna 4 have smaller frequencies in the frequency range of 0.5 GHz to 3 GHz.
  • the return loss has better antenna performance, so that one RF signal can be received or transmitted well by the main antenna 1, and one RF signal can be well received or transmitted through the parasitic antenna 4.
  • the parasitic antenna 4 As shown in FIG. 5, for the parasitic antenna 4 that has been connected to the radio frequency transceiver circuit through the switch circuit 5, the parasitic antenna 4 has a very small back in the frequency band of 0.5 GHz to 1.7 GHz and the frequency band of 2.0 GHz to 3 GHz. Wave loss, with better antenna performance.
  • the main antenna 1 can receive or transmit one radio frequency signal well;
  • the parasitic antenna 4 can also be used as an independent receiving or transmitting antenna during carrier aggregation.
  • a diversity antenna is further disposed in the mobile terminal, when the diversity antenna is required to receive or transmit the radio frequency signal, the diversity antenna is connected to the radio frequency transceiver circuit 6; and then each diversity antenna is used. Receiving one radio frequency signal separately; and so on, when using a diversity antenna to receive multiple radio frequency signals, the diversity antenna and the corresponding number (the corresponding number of values are the same as the number of the multiple radio frequency signals) The radio frequency transceiver circuit 6 is connected to receive multiple radio frequency signals. If it is not necessary to use a diversity antenna to receive the RF signal, the diversity antenna is grounded to maintain the anti-fading function of the diversity antenna.
  • the antenna switching method provided by the embodiment of the present invention is applicable to the antenna switching system provided by the embodiment of the present invention.
  • FIG. 7 is a flowchart of a first antenna switching method according to an embodiment of the present invention. For convenience of description, only parts related to the embodiment of the present invention are shown, which are described in detail below.
  • An antenna switching method includes:
  • the modem of the mobile terminal receives the multiple way prompt sent by the base station, the modem generates a switching instruction according to the multiple way prompt, and sends the switching instruction to the switch circuit;
  • the switch circuit establishes a connection between the parasitic antenna specified by the switching instruction and the radio frequency transceiver circuit.
  • the mobile terminal has been disposed with one or more parasitic antennas, one or more main antennas, and a radio frequency transceiver circuit.
  • one parasitic antenna is connected to a switching circuit.
  • the base station periodically sends a broadcast message to the mobile terminal, where the broadcast message may record multiple prompts or a primary antenna to send and receive prompts. If the mobile terminal receives the multi-channel prompt from the received broadcast message, the mobile terminal is notified by the multi-way prompt to: receive or transmit the multiple radio frequency signals. If the mobile terminal needs to use the parasitic antenna to receive the radio frequency signal, generate a switching instruction, and specify a parasitic antenna for receiving the radio frequency signal by using the switching instruction; wherein the parasitic antenna specified by the switching instruction may be one or more; The specified parasitic antenna is used to receive one RF signal.
  • each switching circuit corresponding to the parasitic antenna specified by the switching instruction receives the switching instruction, the connection between the parasitic antenna specified by the switching instruction and the radio frequency transceiver circuit is established; After the circuit is connected to the parasitic antenna and the RF transceiver circuit, the receiving or transmitting of the RF signal through the parasitic antenna is realized.
  • FIG. 8 is a flowchart of a second antenna switching method according to an embodiment of the present invention. For convenience of description, only parts related to the embodiment of the present invention are shown, which are described in detail below. It should be noted that the second antenna switching method is an optimization of the first antenna switching method. Therefore, the flow included in the first antenna switching method will not be described here.
  • the antenna switching method includes:
  • the switch circuit disconnects the parasitic antenna from the radio frequency transceiver circuit, and grounds the parasitic antenna.
  • the modem of the mobile terminal only extracts the primary antenna transceiver prompt from the received broadcast message, the modem generates a primary antenna transceiver command; and further, the radio frequency transceiver circuit specifies one or more primary antennas according to the primary antenna transceiver command.
  • Send or receive one or more RF signals it should be noted that one main antenna is used to: transmit or receive one RF signal.
  • the switch circuit when the switch circuit is connected to the main antenna, the connection between the parasitic antenna and the radio frequency transceiver circuit is directly disconnected, and the parasitic antenna is grounded to maintain the spread spectrum function of the parasitic antenna.
  • FIG. 8 is a flowchart of a third antenna switching method according to an embodiment of the present invention. For convenience of description, only parts related to the embodiment of the present invention are shown, which are described in detail below. It should be noted that the second antenna switching method is further optimized for the second antenna switching method. Therefore, the processes included in the first antenna switching method and the second switching method are not described herein.
  • the antenna switching method before performing step S31 or step S33, the antenna switching method further includes:
  • the modem of the mobile terminal establishes a connection with a base station of a different frequency band through a primary antenna, receives broadcast information sent by the base station, determines whether multiple prompts are recorded in the broadcast information, and determines the broadcast. Whether the main antenna is sent or received is indicated in the message.
  • the mobile terminal in a normal state is in a sleep state, that is, the parasitic antenna is grounded; the single-pole multi-throw switch in the modem control radio frequency transceiver circuit disconnects the main antenna from the radio frequency transceiver in the radio frequency transceiver circuit.
  • the RF transceiver cannot receive or transmit RF signals through the primary antenna.
  • the modem of the mobile terminal controls each of the switches of the single-pole multi-throw switch to be closed once to complete the scanning of each frequency band.
  • different frequency segments are selected by different switches in the single-pole multi-throw switch; and, in the single-pole multi-throw switch
  • the modem of the mobile terminal receives the broadcast signal sent by the base station; if the broadcast signal carries multiple prompts, the mobile communication receives one or more radio frequency signals through one or more main antennas, and the modem of the mobile terminal Determining whether it is necessary to use a parasitic antenna to receive the RF signal of the other path, and if necessary, generating a switching instruction to specify a parasitic antenna for receiving the RF signal through the switching instruction to establish a connection between the parasitic antenna and the RF transceiver circuit; or The broadcast signal carries the main antenna transceiver prompt, and generates a main antenna transceiver command, and controls the main antenna to receive the radio frequency signal
  • the mobile terminal when the broadcast signal carries multiple prompts, the mobile terminal initiates a request for establishing a radio connection with the base station through the primary antenna and/or the parasitic antenna, and after receiving the radio frequency connection, implements functions such as answering a call and receiving a short message.

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Abstract

本发明适用于移动终端领域，提供了一种天线切换系统以及方法；所述天线切换系统包括射频收发电路、主天线以及寄生天线，所述主天线接所述射频收发电路，还包括：开关电路，用于当使用所述寄生天线接收或发送射频信号吋，将所述寄生天线与所述射频收发电路连接。如果将寄生天线与地连接，寄生天线可用于扩频；另外，在需要载波聚合吋，将寄生天线与射频收发电路连接，成为一路独立的接收或发送天线。这样，没有增加新的天线，仅仅利用了现有移动终端中包含的主天线和寄生天线，就实现了增加接收或发送射频信号的路数的效果。

Description

一种天线切换系统以及方法 技术领域
本发明属于移动终端领域，尤其涉及一种天线切换系统以及方法。
背景技术
对于移动终端（例如：手机），当需要提高上行速率和/或下行速率时，可以通过增加带宽实现。带宽的增加可采用载波聚合（Carrier Aggregation，CA）实现，具体包括以下两种：第一种，频段内的载波聚合；第二种，不同频段的载波聚合。对于第一种增加带宽的方案，可以通过一个主天线接收射频信号，针对接收下来的射频信号采用不同I/Q(同相/正交)解调实现。而对于第二种增加带宽的方案，现有技术中，由于移动通信中实际使用的无线频率资源比较分散、移动通信使用的部分频段的带宽较窄等原因，当在不同频段进行载波聚合时，就需要针对每个频段添加一个独立的天线进行对应接收/发送。
图1所示为目前常见的移动终端中包含的天线示意图，为了示意出天线，使用虚线将天线框选出来；如图，包括：主天线1、另一主天线2、分集天线3以及寄生天线4；其中，分集天线3用于抗衰弱，寄生天线4用于扩频；而为了满足多个频段载波聚合的需要，主天线1可用于一个频段，而另一主天线2可用于另一频段。由图可见，该终端中已经包括了多个天线，而且，由于移动终端日趋小型化，要在移动终端的有限空间下增设天线极具难度。
 技术问题
本发明实施例的目的在于提供一种天线切换系统以及方法，以解决现有技术中接收或发送射频信号的路数受制于主天线的数量的问题。
技术解决方案
第一方面，一种天线切换系统包括射频收发电路、主天线以及寄生天线，所述主天线接所述射频收发电路，还包括：
开关电路，用于当使用所述寄生天线接收或发送射频信号时，将所述寄生天线与所述射频收发电路连接。
结合第一方面，在第一方面的第一种可能的实现方式中，所述寄生天线的个数为P个，所述P为正整数，所述主天线的个数为M个，所述M为正整数；
一个所述开关电路，具体用于将一个所述寄生天线与所述射频收发电路连接，以当需要N路接收或发送不同频段的射频信号时使用K个所述开关电路分别建立K个所述寄生天线与所述射频收发电路的连接，所述N减去所述K为所述M，所述N为大于1的正整数，所述P大于或等于所述K。
结合第一方面或者第一方面的第一种可能的实现方式，在第一方面的第二种可能的实现方式中，所述开关电路，还用于：
当仅使用主天线接收或发送射频信号时，断开所述寄生天线与所述射频收发电路的连接，将所述寄生天线接地。
结合第一方面或者第一方面的第一种可能的实现方式或者第一方面的第二种可能的实现方式，在第一方面的第三种可能的实现方式中，所述开关电路，具体用于：
当接收到移动终端的调制解调器发送的切换指令时，将所述切换指令指定的寄生天线与所述射频收发电路连接。
结合第一方面或者第一方面的第一种可能的实现方式或者第一方面的第二种可能的实现方式或者第一方面的第三种可能的实现方式，在第一方面的第四种可能的实现方式中，所述开关电路，具体用于：
当接收到所述移动终端的调制解调器发送的主天线收发指令时，将所述寄生天线接地。
结合第一方面或者第一方面的第一种可能的实现方式或者第一方面的第二种可能的实现方式或者第一方面的第三种可能的实现方式或者第一方面的第四种可能的实现方式，在第一方面的第五种可能的实现方式中，所述开关电路包括开关端，还包括一个与所述寄生天线连接的天线端；
所述射频收发电路包括：第二双工器，第二射频功率放大器，以及射频收发器；
一个所述第二双工器的接收端接所述的射频收发器的一个第二码分制式接收端，所述射频收发器的一个第二码分制式发送端在串联一个所述第二射频功率放大器后接一个所述第二双工器的发送端，一个所述第二双工器的天线端接所述开关电路的一个开关端；
所述开关电路，还具体用于：
当接收到移动终端的调制解调器发送的频段开关指令时，闭合所述开关电路的天线端和与所述频段开关指令指定的第二双工器的天线端连接的开关端。
结合第一方面或者第一方面的第一种可能的实现方式或者第一方面的第二种可能的实现方式或者第一方面的第三种可能的实现方式或者第一方面的第四种可能的实现方式或者第一方面的第五种可能的实现方式，在第一方面的第六种可能的实现方式中，所述射频收发电路还包括：第四射频功率放大器，以及第二声表面滤波器；
所述射频收发器的一个第二时分制式发送端在串联一个所述第四射频功率放大器后接所述开关电路的一个开关端；
一个所述第二声表面滤波器的振动发送端和接收端分别接所述开关电路的一个开关端和所述射频收发器的一个第二时分制式接收端。
所述开关电路，还具体用于：
当接收到移动终端的调制解调器发送的选择发送指令时，闭合所述开关电路的天线端和与所述选择发送指令指定的第四射频功率放大器连接的开关端；
当接收到移动终端的调制解调器发送的选择接收指令时，闭合所述开关电路的天线端和与所述选择接收指令指定的第二声表面滤波器的振动发送端。
结合第一方面或者第一方面的第一种可能的实现方式或者第一方面的第二种可能的实现方式或者第一方面的第三种可能的实现方式或者第一方面的第四种可能的实现方式或者第一方面的第五种可能的实现方式或者第一方面的第六种可能的实现方式，在第一方面的第七种可能的实现方式中，所述射频收发电路还包括：第一双工器，第一射频功率放大器，第三射频功率放大器，第一声表面滤波器，以及单刀多掷开关器；
一个所述第一双工器的接收端接所述射频收发器的一个第一码分制式接收端，所述射频收发器的一个第一码分制式发送端在串联一个所述第一射频功率放大器后接一个所述第一双工器的发送端；
一个所述第一双工器的天线端接所述单刀多掷开关器中的一个开关端，所述单刀多掷开关器的天线端接所述主天线；
所述射频收发器的一个第一时分制式发送端在串联一个所述第三射频功率放大器后接所述单刀多掷开关器中的一个开关端；
一个所述第一声表面滤波器的振动发送端和接收端分别接所述单刀多掷开关器中的一个开关端和所述射频收发器的一个第一时分制式接收端；
所述单刀多掷开关器，用于当接收到所述移动终端的调制解调器发送的开关指令时，闭合所述单刀多掷开关器的天线端和与所述开关指令指定的第一双工器的天线端连接的开关端，或者闭合所述单刀多掷开关器的天线端和与所述开关指令指定的第三射频功率放大器连接的开关端，或者闭合所述单刀多掷开关器的天线端和与所述开关指令指定的第一声表面滤波器连接的开关端。
结合第一方面或者第一方面的第一种可能的实现方式或者第一方面的第二种可能的实现方式或者第一方面的第三种可能的实现方式或者第一方面的第四种可能的实现方式或者第一方面的第五种可能的实现方式或者第一方面的第六种可能的实现方式或者第一方面的第七种可能的实现方式，在第一方面的第八种可能的实现方式中，所述开关电路，具体还用于：
将P个寄生天线中未与所述射频收发电路连接的寄生天线接地。
第二方面，一种天线切换方法，所述天线切换方法包括：
若移动终端的调制解调器接收到基站发送的多路提示，则所述调制解调器根据所述多路提示生成切换指令，将所述切换指令发送至开关电路；
所述开关电路建立所述切换指令指定的寄生天线与射频收发电路之间的连接。
结合第二方面，在第二方面的第一种可能的实现方式中，所述天线切换方法包括：
若所述移动终端的调制解调器接收到基站发送的主天线收发提示，根据所述主天线收发提示生成主天线收发指令，将所述主天线收发指令发送至开关电路；
所述开关电路断开所述寄生天线与所述射频收发电路的连接，将所述寄生天线接地。
结合第一方面或者第一方面的第一种可能的实现方式，在第一方面的第二种可能的实现方式中，所述天线切换方法还包括：
每隔预设时间段，所述移动终端的调制解调器通过主天线与不同频段的基站建立连接，接收基站发送的广播信息，判断所述广播信息中是否记载有多路提示，判断所述广播信息中是否记载有主天线收发提示。
 有益效果
本发明实施例的有益效果是：通过将寄生天线选择性的与地或者与射频收发电路连接，使得寄生天线既可以用于扩频，也可以在需要载波聚合时，用于成为一路独立的接收或发送天线。采用本发明实施例，没有增加新的天线，仅仅利用了现有移动终端中包含的主天线和寄生天线，就实现了增加接收或发送射频信号的路数的效果。
附图说明
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。
图1本发明背景技术提供的移动终端中的天线示意图；
图2本发明实施例提供的天线切换系统的系统架构图；
图3本发明实施例提供的天线切换系统的具体电路图；
图4本发明实施例提供的包括一个主天线和一个接地的寄生天线的切换系统中的主天线的天线性能图；
图5本发明实施例提供的包括一个主天线和一个与射频收发电路连接的寄生天线的天线切换系统中的寄生天线的天线性能图；
图6本发明实施例提供的包括一个主天线和一个与射频收发电路连接的寄生天线的天线切换系统中的主天线的天线性能图；
图7本发明实施例提供的第一种天线切换方法的流程图；
图8本发明实施例提供的第二种天线切换方法的流程图；
图9本发明实施例提供的第三种天线切换方法的流程图。
 本发明的实施方式
为了使本发明的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本发明进行进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。
在本发明实施例中，“第一双工器”、“第一射频功率放大器”、 “第一码分制式接收端” 、“第一码分制式发送端”、“第一时分制式发送端”、“第一时分制式接收端”以及“第一声表面滤波器”中包含的“第一”均为代指，仅用于区分。“第二双工器”、“第二射频功率放大器”、“第二码分制式接收端”、“第二码分制式发送端”、“第二时分制式发送端”、“第二时分制式接收端”以及“第二声表面滤波器”中包含的“第二”均为代指，仅用于区分。“第三射频功率放大器”和“第三声表面滤波器”中包含的“第三”均为代指，仅用于区分。“第四射频功率放大器”中的“第四”也为代指，仅用于区分。
为了说明本发明所述的技术方案，下面通过具体实施例来进行说明。
图2示出了本发明实施例提供的天线切换系统的系统架构，为了便于说明，仅示出了与本发明实施例相关的部分，详述如下。
一种天线切换系统，包括射频收发电路6、主天线1以及寄生天线4，所述主天线1接所述射频收发电路6，还包括：
开关电路5，用于当使用所述寄生天线4接收或发送射频信号时，将所述寄生天线4与所述射频收发电路6连接。
具体地，天线切换系统包括一个或多个主天线1，一个或多个寄生天线4；其中，一个主天线1可用于接收或发送一路射频信号。
包括有射频收发器的射频收发电路6，所述射频收发器与移动终端的调制解调器连接，用于通过射频收发器将调制解调器输出的基带信号（低频信号）调制到高频的载波（不同频段的载波，载波的频率不一样）上，将调制生成的射频信号通过主天线1和/或寄生天线4发送出去；另外，当主天线1和/或寄生天线4接收到射频信号时，射频收发电路6中的射频收发器根据匹配的载波频率从接收到的射频信号中解调出基带信号。
由于主天线1与射频收发电路6连接，即主天线1与射频收发电路6是连通的，射频收发电路6可通过主天线1进行射频信号的收发。当使用主天线1接收或发送射频信号的同时，如若需要使用寄生天线4接收或发送射频信号，则可通过开关电路5建立寄生天线4与射频收发电路6连接，以通过开关电路5连通寄生天线4与射频收发电路6，从而射频收发电路6可通过寄生天线4接收或发送射频信号。
作为一具体实施例，当CA组合出两个不同的频段时，使用主天线1接收或发送其中一个频段的射频信号；待通过开关电路5连通一个寄生天线4和射频收发电路6后，通过该寄生天线4接收或发送另一个频段的射频信号。以此类推，当CA组合出多个不同的频段时，可从所有的寄生天线4和/或所有的主天线1中选定多个用于接收或发送不同频段的射频信号的天线，进而，调制解调器控制开关电路5分别建立寄生天线4与射频收发电路6之间的连接。
优选的，当需要接收的射频信号的路数超过主天线1的个数时，将全部主天线1都用于接收或发送不同路的射频信号；与此同时，通过所述开关电路5建立起所述寄生天线4与所述射频收发电路6连接，通过一个寄生天线4接收一路射频信号，实现通过一个或多个寄生天线4接收或发送剩余路数（所述剩余路数通过计算待接收射频信号的路数减去主天线1的个数得到）的射频信号。
具体地，所述寄生天线4的个数为P个，所述P为正整数，所述主天线1的个数为M个，所述M为正整数；
一个开关电路5，具体用于将一个寄生天线4与射频收发电路6连接，以当需要N路接收或发送不同频段的射频信号时使用K个开关电路5分别建立K个寄生天线4与射频收发电路6的连接，所述N减去所述K为所述M，所述N为大于1的正整数，所述P大于或等于所述K。
这样，每个开关电路5均建立一个寄生天线4与射频收发电路6的连接。若调制解调器判定需要接收N个频段的射频信号，指定所述M个主天线1分别接收不同路的射频信号，指定剩余K路的射频信号分别通过K个寄生天线4接收；进而，调制解调器分别控制K个开关电路5，以分别将指定的K个寄生天线4与射频收发电路6连接。
另外，优选的是，所述开关电路5具体还用于：将P个寄生天线4中未与所述射频收发电路6连接的寄生天线4均接地。
这样，对于P个寄生天线4中未通过开关电路5与射频收发电路6连接的寄生天线4，调制解调器分别控制对应的开关电路5将未与射频收发电路6连接的寄生天线4均接地，以保持扩频功能，使得主天线1和与射频收发电路6连接的寄生天线4能够接收更宽频段的射频信号。
优选的是，所述开关电路5，还用于：
当仅使用主天线1接收射频信号时，断开所述寄生天线4与所述射频收发电路6的连接，将所述寄生天线4接地。
具体地，当不需要使用寄生天线4接收射频信号，而仅需要使用主天线1接收射频信号时，将所有的寄生天线4均接地；进而，寄生天线4仍用于扩频，使得主天线1能够接收更宽频段的射频信号。
优选的是，所述开关电路5，具体用于：
当接收到移动终端的调制解调器发送的切换指令时，将所述切换指令指定的寄生天线4与所述射频收发电路6连接。
具体地，每隔预设时间段，主天线1接收基站发送的携带广播信息的射频信号，该携带广播信息的射频信号经过射频接收电路处理成携带广播信息的基带信号后，调制解调器从该基带信号中提取出广播信息。若该广播信息记载有多路提示，即代表需要接收CA组合出的至少两路射频信号；同时，从该多路提示中提取出CA组合出的不同频段，以进一步确定移动终端需要接收或发送射频信号的路数；具体地，由于每个开关电路5只能接一个寄生天线，进而调制解调器根据该多路提示生成切换指令，该切换指令指定了使用哪些寄生天线4，继而，接收到该切换指令的开关电路5建立对应的寄生天线4与射频收发电路6的连接；进而通过所述切换指令指定的寄生天线4接收相应路数（其中，所述相应路数的数值与所述切换指令指定的寄生天线4的个数的数值相同）的射频信号。
优选的是，所述开关电路5，具体用于：
当接收到所述移动终端的调制解调器发送的主天线收发指令时，将所述寄生天线4接地。
具体地，当开关电路5接收到调制解调器发送的主天线收发指令，代表仅需要使用主天线1接收射频信号；为提高主天线1所能接收的射频信号的带宽，将所有的寄生天线4接地。
在本发明另一实施例中，使用图3示出了本发明实施例提供的天线切换系统的具体电路。在图3中，为了避免将标示线误认为天线的一部分，主天线1采用虚线框框选出，寄生天线4也采用虚线框框选出。同时为了示意射频收发电路6的内部电路与主天线1和开关电路5的连接关系，射频收发电路6也采用虚线框框选出；其中，单刀多掷开关器61采用实线框以及该实线框内包括的多个开关表示，该单刀多掷开关器61的天线端（开关器的固定端）接主天线1；其中与单刀多掷开关器61的开关端（开关器的掷端）连接的DUP为第一双工器，其中与第一双工器的发送端连接的、内含三角形的方框为第一射频功率放大器，其中与单刀多掷开关器61的开关端连接的、内含三角形的方框为第三射频功率放大器，其中与单刀多掷开关器61的开关端连接的一个小长方框为第一声表面滤波器(SAW)。另外，开关电路5采用内含一个或多个开关的实线框表示；同时，与开关电路5的一个开关端连接的DUP为第二双工器，其中与第二双工器的发送端连接的、内含三角形的方框为第二射频功率放大器，其中与开关电路5的一个开关端连接的、内含三角形的方框为第四射频功率放大器，其中与开关电路5的一个开关端连接的一个小长方框为第二声表面滤波器。
需要强调的是，本发明实施例提供的天线切换系统包括一个或多个主天线1，还包括一个或多个寄生天线4；为了示意，图3仅提供了一个主天线1与射频收发电路6的具体电路连接图，以及仅提供了一个开关电路5分别与一个寄生天线4和射频收发电路6的具体电路连接图；另需说明的是，对于每个寄生天线4，均需使用一个开关电路5与射频收发电路6才能建立连接。为了示意，下面仅针对一个寄生天线4经过一个开关电路5与射频收发电路6连接的具体电路。
另需说明的是，在本发明实施例中，一直保持主天线1的馈电端12与单刀多掷开关器61的天线端的连接；另根据主天线1的工作场合，决定是否将主天线1的接地端11接地。
在本发明另一实施例中，所述寄生天线4用于码分多路通信（例如：采用宽带码分多址（Wideband Code Division Multiple Access，WCDMA）通信协议的多路射频通信），所述开关电路5包括一个或多个开关端，还包括一个与所述寄生天线4连接的天线端；
所述射频收发电路6包括：一个或多个第二双工器，一个或多个第二射频功率放大器，以及射频收发器；
其中，射频收发器具有一个或多个第二码分制式接收端，还具有一个或多个第二码分制式发送端；其中，一个所述第二双工器的接收端接所述的射频收发器的其中一个第二码分制式接收端，所述射频收发器的其中一个第二码分制式发送端在串联一个所述第二射频功率放大器后接一个所述第二双工器的发送端，一个所述第二双工器的天线端接所述开关电路5的一个开关端。另外，射频收发器还具有能够与调制解调器通信的一个或多个交互端。
与此同时，所述开关电路5还具体用于：
当接收到移动终端的调制解调器发送的频段开关指令时，闭合所述开关电路5的天线端和与所述频段开关指令指定的第二双工器的天线端连接的开关端。
其中，所述开关电路5包括一个或多个开关，将每个开关的一端相连在一起以形成所述开关电路5的天线端，一个开关的另一端为所述开关电路5的一个开关端，即每个开关的另一端分别为所述开关电路5的一个开关端。以此类推，一个开关电路5的天线端能接一个寄生天线4。因此针对每个需添加发送或接收射频信号功能的寄生天线4，均需要一个开关电路5提供对应的天线端以与寄生天线4连接。
优选的是，所述开关电路5为单刀多掷开关器，单刀多掷开关器的共同端为开关电路5的天线端，每个单刀多掷开关器中的另外端口（除单刀多掷开关器的共同端）分别为所述开关电路5的开关端。
具体地，首先，移动终端通过主天线1接收基站发送的广播信息。进而，调制解调器根据该广播信息记载的多路提示，从该广播信息记载的多路提示中得知需要接收的多路射频信号分别处于的频段，生成切换指令（通过该切换指令指定哪个寄生天线4用于接收或发送哪个频段的射频信号）。针对切换指令指定的其中一个寄生天线4，若该多路提示进一步指定了通信制式为码分通信，则生成频段开关指令并向与该个寄生天线4连接的开关电路5发送该频段开关指令，通过所述频段开关指令控制该开关电路5连通该个寄生天线4与第二双工器；具体地，由于开关电路5包含的不同开关的开关端连接不同频段的第二双工器，通过该频段开关指令指定该个寄生天线4通过该开关电路5包含的对应频段的开关连接射频收发电路6中对应的第二双工器，通过指定开关实现对第二双工器的指定，以进一步指定了对码分通信的哪个频段的射频信号进行接收。
进而，当使用寄生天线4接收码分通信的射频信号时，寄生天线4将接收到的射频信号传输到第二双工器的天线端；第二双工器从接收端将接收到的射频信号传输至射频收发器的第二码分制式接收端；进而，射频收发器对接收到的射频信号进行码分解调，解调出基带信号，并将解调出的基带信号从一个或多个交互端发送至调制解调器。
相应地，当接收到调制解调器发送的基带信号后，射频收发器对接收到的基带信号进行码分调制；同时，调制解调器已通过向开关电路5发送频段开关指令，以闭合指定的开关并建立起一个寄生天线4（为：与该开关电路5连接的一个寄生天线4）与对应的第二双工器的连接（同理，通过指定开关实现对第二双工器的指定，进而指定了发送哪个频段的射频信号）；进而，射频收发器根据调制解调器指定的频段对基带信号进行码分调制，通过第二功率放大器对码分调制生成的射频信号进行功率放大，经过指定的双工器和指定的开关后将功率放大后的射频信号传输至对应的该个寄生天线4以发射出去。
在本发明另一实施例中，寄生天线4还可用于时分多路通信（例如：采用 TD-LTE通信协议的多路射频通信），所述射频收发电路6还包括：一个或多个第四射频功率放大器，以及一个或多个第二声表面滤波器；
所述射频收发器的一个第二时分制式发送端在串联一个所述第四射频功率放大器后接所述开关电路5的一个开关端；
一个所述第二声表面滤波器的振动发送端和所述开关电路5的一个开关端连接，一个所述第二声表面滤波器的接收端和所述射频收发器的一个第二时分制式接收端连接。
与此同时，所述开关电路5还具体用于：
当接收到移动终端的调制解调器发送的选择发送指令时，闭合所述开关电路5的天线端和与所述选择发送指令指定的第四射频功率放大器连接的开关端；
当接收到移动终端的调制解调器发送的选择接收指令时，闭合所述开关电路5的天线端和与所述选择接收指令指定的第二声表面滤波器的振动发送端。
具体地，首先，移动终端通过主天线1接收基站发送的广播信息。进而，调制解调器根据该广播信息记载的多路提示，生成切换指令，该切换指令指定了一个或多个寄生天线4。
同时，针对切换指令指定的其中一个寄生天线4，调制解调器从该广播信息记载的多路提示中得知需要发送的多路射频信号分别处于的频段，若该多路提示进一步指定了通信制式为时分通信，则生成选择发送指令，通过该选择发送指令控制开关电路5连通该个寄生天线4与第四射频功率放大器；具体地，由于开关电路5包含的不同开关的开关端连接不同频段的第四射频功率放大器，该选择发送指令指定了该个寄生天线4通过开关电路5包含的哪个开关连接射频收发电路6中对应的第四射频功率放大器；通过指定开关实现对第四射频功率放大器的指定，以进一步指定了发送时分通信的哪个频段的射频信号。
同理，针对切换指令指定的其中一个寄生天线4，调制解调器从该广播信息记载的多路提示中得知需要接收的多路射频信号分别处于的频段，若该多路提示进一步指定了通信制式为时分通信，则生成选择接收指令，通过该选择接收指令控制开关电路5连接该个寄生天线4与第二声表面滤波器；具体地，由于开关电路5包含的不同开关的开关端连接不同频段的第二声表面滤波器，该选择接收指令指定了该个寄生天线4通过开关电路5包含的哪个开关连接射频收发电路6中对应的第二声表面滤波器，通过指定开关实现对第二声表面滤波器的指定，以进一步指定了接收时分通信的哪个频段的射频信号。
换言之，一方面，当接收到调制解调器发送的基带信号后，射频收发器对接收到的基带信号进行时分调制；同时，调制解调器通过向开关电路5发送选择接收指令，以通过所述选择接收指令指定的开关建立起寄生天线4与对应的第二射频功率放大器的连接。另一方面，射频收发器根据调制解调器指定的频段对基带信号进行时分调制，将时分调制生成的射频信号经过指定的第二射频功率放大器和指定的开关传输至寄生天线4以发射出去。
相应地，当使用寄生天线4接收时分通信的射频信号时，寄生天线4将接收到的射频信号传输到第二声表面滤波器的振动发送端；第二声表面滤波器将接收到的射频信号进行滤波，将滤波后的射频信号传输至射频收发器的第二时分制式接收端；进而，射频收发器对接收到的射频信号进行时分解调，解调出基带信号，并将解调出的基带信号发送至调制解调器。
优选的是，所述射频收发器的一个或多个第二时分制式发送端均可在串联一个所述第四射频功率放大器和第三声表滤波器后再接所述开关电路5的一个开关端。通过该第三声表滤波器对从所述射频收发器的第二时分制式发送端发出的射频信号进行去噪滤波。
在本发明另一实施例中，对于使用主天线1发送或接收射频信号的情况，所述射频收发电路6包括一个或多个单刀多掷开关器61，其中使用每个单刀多掷开关器61的天线端外接一个主天线1。为了解释方便，下面仅针对外接一个主天线1的情况进行详述。
具体地，所述射频收发电路6还包括：一个或多个第一双工器，一个或多个第一射频功率放大器，一个或多个第三射频功率放大器，一个或多个第一声表面滤波器，以及单刀多掷开关器61；
一个所述第一双工器的接收端接所述射频收发器的一个第一码分制式接收端，所述射频收发器的一个第一码分制式发送端在串联一个所述第一射频功率放大器后接一个所述第一双工器的发送端；
一个所述第一双工器的天线端接所述单刀多掷开关器61中的一个开关端，所述单刀多掷开关器61的天线端接所述主天线1；
所述射频收发器的一个第一时分制式发送端在串联一个所述第三射频功率放大器后接所述单刀多掷开关器61中的一个开关端；
一个所述第一声表面滤波器的振动发送端和接收端分别接所述单刀多掷开关器61中的一个开关端和所述射频收发器的一个第一时分制式接收端；
与此同时，所述单刀多掷开关器61，用于当接收到所述移动终端的调制解调器发送的开关指令时，闭合所述单刀多掷开关器61的天线端和与所述开关指令指定的第一双工器的天线端连接的开关端，或者闭合所述单刀多掷开关器61的天线端和与所述开关指令指定的第三射频功率放大器连接的开关端，或者闭合所述单刀多掷开关器61的天线端和与所述开关指令指定的第一声表面滤波器连接的开关端。
更具体地，所述第一双工器，与主天线1和射频收发电路6连接时，用于传输码分通信的射频信号；其中，对于制成的不同所述第一双工器，接收或发送的射频信号处于的频段不同。具体地，当需要使用所述主天线1发送所述码分通信的射频信号时，射频收发器从第一码分制式发送端将调制好的射频信号发送至第一射频放大器进行功率放大，所述第一双工器从发送端接收功率放大后的射频信号并从天线端将功率放大后的射频信号发送至主天线1以发射出去；当需要使用所述主天线1接收所述码分通信的射频信号时，所述第一双工器通过天线端获取到所述主天线1接收到的射频信号，并通过接收端将获取到的射频信号传输至射频收发器的一个第一码分制式接收端。
所述第一声表面滤波器，用于时分通信，与主天线1和射频收发器连接时，将主天线1接收到的时分通信的射频信号传输至射频收发器；具体地，将主天线1接收到的时分通信的射频信号进行滤波，将滤波后的射频信号传输至与所述第一声表面滤波器连接的第一时分制式接收端。
所述第三射频功率放大器，用于时分通信，与主天线1和射频收发器连接时，用于将射频收发器从第一时分制式发送端发出的时分通信的射频信号进行功率放大，将功率放大后的射频信号发送至主天线1以发射出去。
进而，当调制解调器接收到基站发送的多路提示或主天线1收发提示时，生成开关指令；若通过该开关指令指定了与第一双工器的天线端连接的开关端，则闭合所述单刀多掷开关器61的天线端和与所述开关指令指定的第一双工器的天线端连接的开关端，实现通过主天线1进行码分通信的射频信号的接收或发送。
若通过该开关指令指定了第三射频功率放大器连接的开关端，则闭合所述单刀多掷开关器61的天线端和与所述开关指令指定的第三射频功率放大器连接的开关端，实现通过主天线1进行时分通信的射频信号的发送。
若通过该开关指令指定了第一声表面滤波器连接的开关端，则闭合所述单刀多掷开关器61的天线端和与所述开关指令指定的第一声表面滤波器连接的开关端，实现通过主天线1进行时分通信的射频信号的接收。
优选的是，所述射频收发器的一个或多个第一时分制式发送端均可在串联一个所述第三射频功率放大器和声表滤波器后再接所述单刀多掷开关器61中的一个开关端。通过该声表滤波器器对从所述射频收发器的第一时分制式发送端发出的射频信号进行去噪滤波。
为了更好地说明本发明实施例的有益效果，以包括一个主天线1和一个接地的寄生天线4的切换系统为例，图4示出了该切换系统中寄生天线4接地时主天线1的天线性能图；图5示出了天线切换系统中的寄生天线4已通过开关电路5与射频收发电路连接时寄生天线4的天线性能图；图6示出了天线切换系统中的寄生天线4已通过开关电路5与射频收发电路连接时主天线1的天线性能图。
在图4、图5以及图6中，横坐标表示频率，单位为：吉赫兹（GHz）；纵坐标表示回波损耗，单位为分贝（DB）。
当天线切换系统中的寄生天线4接地，仅使用主天线1进行射频信号的收发时，从图4可以看出，主天线具有较小的回波损耗，能够良好地接收或发送一路射频信号。
当天线切换系统中的寄生天线4已通过开关电路5与射频收发电路连接后，从图5和图6可以看出，主天线1和寄生天线4在0.5GHz到3GHz的频段均具有较小的回波损耗，具有较好的天线性能，从而能够通过主天线1良好地接收或发送一路射频信号的同时，还能够通过寄生天线4良好地接收或发送一路射频信号。
另针如图5所示，对于已通过开关电路5与射频收发电路连接的寄生天线4，在0.5GHz到1.7GHz的频段和在2.0GHz到3GHz的频段，该寄生天线4具有非常小的回波损耗，具有较佳的天线性能。
这样，从图4、图5以及图6可以看出，无论开关电路将寄生天线4选择性的接地或接射频收发电路，主天线1都能良好地对一路射频信号进行接收或发送；在需要载波聚合时，还可将寄生天线4作为一路独立的接收或发送天线。
作为本发明一实施例，若移动终端中还设有分集天线，当需要使用分集天线接收或发送射频信号时，将所述分集天线与所述射频收发电路6连接；进而实现使用每个分集天线分别接收一路射频信号；以此类推，需要使用分集天线接收多路射频信号时，将对应个数（所述对应个数的数值与多路射频信号的路数的数值相同）的分集天线与所述射频收发电路6连接以接收多路的射频信号。若不需要使用分集天线接收射频信号时，将该分集天线接地，以保持分集天线的抗衰弱功能。
需要说明的是，本发明实施例提供的天线切换方法与本发明实施例提供的天线切换系统相互适用。
图7示出了本发明实施例提供的第一种天线切换方法的流程，为了便于说明，仅示出了与本发明实施例相关的部分，详述如下。
一种天线切换方法，所述天线切换方法包括：
S31，若移动终端的调制解调器接收到基站发送的多路提示，则所述调制解调器根据所述多路提示生成切换指令，将所述切换指令发送至开关电路；
S32，所述开关电路建立所述切换指令指定的寄生天线与射频收发电路之间的连接。
需要说明的是，移动终端已安置有一个或多个寄生天线，一个或多个主天线，以及射频收发电路等。优选的，一个寄生天线接一个开关电路。
具体地，基站会定期向所述移动终端发送广播消息，该广播消息可能记载有多路提示或主天线收发提示。若移动终端接收从接收到的广播消息中获取到多路提示，通过该多路提示通知移动终端：进行多路射频信号的接收或发送。若移动终端需要使用寄生天线进行射频信号的接收时，生成切换指令，通过该切换指令指定用于接收射频信号的寄生天线；其中，该切换指令指定的寄生天线可以为一个或多个；需要说明的是，一个指定的寄生天线用于接收一路射频信号。
由于一个开关电路只能外接一个寄生天线，进而当与该切换指令指定的寄生天线对应的每个开关电路接收到切换指令后，建立该切换指令指定的寄生天线与射频收发电路的连接；通过开关电路连接寄生天线和射频收发电路后，实现通过寄生天线对射频信号的接收或发送。
图8示出了本发明实施例提供的第二种天线切换方法的流程，为了便于说明，仅示出了与本发明实施例相关的部分，详述如下。需要说明的是，所述第二种天线切换方法是对第一种天线切换方法的优化。因此，在此不再赘述第一种天线切换方法所包括的流程。
优选的是，所述天线切换方法包括：
S33，若所述移动终端的调制解调器接收到基站发送的主天线收发提示，根据所述主天线收发提示生成主天线收发指令，将所述主天线收发指令发送至开关电路；
S34，所述开关电路断开所述寄生天线与所述射频收发电路的连接，将所述寄生天线接地。
具体地，若移动终端的调制解调器仅从接收到的广播消息提取出主天线收发提示，则该调制解调器生成主天线收发指令；进而，射频收发电路根据该主天线收发指令指定的一个或多个主天线发送或接收一路或多路射频信号；需要说明的是，一个主天线用于：发送或接收一路射频信号。
与此同时，所述开关电路接到主天线收发指令时，直接断开所述寄生天线与所述射频收发电路的连接，将所述寄生天线接地，以保持所述寄生天线的扩频功能。
图8示出了本发明实施例提供的第三种天线切换方法的流程，为了便于说明，仅示出了与本发明实施例相关的部分，详述如下。需要说明的是，所述第二种天线切换方法是对第二种天线切换方法的进一步优化。因此，在此未赘述第一种天线切换方法和第二种切换方法所包括的流程。
优选的是，在执行步骤S31或步骤S33之前，所述天线切换方法还包括：
S35，每隔预设时间段，所述移动终端的调制解调器通过主天线与不同频段的基站建立连接，接收基站发送的广播信息，判断所述广播信息中是否记载有多路提示，判断所述广播信息中是否记载有主天线收发提示。
具体地，为了省电，通常情况下的移动终端处于睡眠状态，即寄生天线均接地；调制解调器控制射频收发电路中的单刀多掷开关器断开主天线与射频收发电路中的射频收发器的连接，从而，射频收发器无法通过主天线接收或发送射频信号。
然后，每隔预设时间段，所述移动终端的调制解调器控制单刀多掷开关器中的每个开关分别闭合一次以完成对每个频段的扫描。需要说明的是，通过单刀多掷开关器中的不同开关，选择不同的频率段；进而，当单刀多掷开关器中的 开关闭合时，移动终端的调制解调器接收到基站发送的广播信号；若该广播信号携带有多路提示，则移动通信通过一个或多个主天线接收一路或多路射频信号的同时，移动终端的调制解调器判断是否需要使用寄生天线接收其它路的射频信号，若需要，则生成切换指令，以通过该切换指令指定用来接收射频信号的寄生天线以建立该寄生天线与射频收发电路的连接；或者若该广播信号携带有主天线收发提示，则生成主天线收发指令，通过该主天线收发指令控制主天线对射频信号的接收。
进而，当该广播信号携带有多路提示时，移动终端通过主天线和/或寄生天线发起与基站建立射频连接的请求，待完成射频连接后，实现电话接听，短信接收等功能。
以上内容是结合具体的优选实施方式对本发明所作的进一步详细说明，不能认定本发明的具体实施只局限于这些说明。对于本发明所属技术领域的普通技术人员来说，在不脱离本发明构思的前提下做出若干等同替代或明显变型，而且性能或用途相同，都应当视为属于本发明由所提交的权利要求书确定的专利保护范围。

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  1. 一种天线切换系统，包括射频收发电路、主天线以及寄生天线，所述主天线接所述射频收发电路，其特征在于，还包括：
    开关电路，用于当使用所述寄生天线接收或发送射频信号时，将所述寄生天线与所述射频收发电路连接。
  2. 如权利要求1所述的天线切换系统，其特征在于，所述寄生天线的个数为P个，所述P为正整数，所述主天线的个数为M个，所述M为正整数；
    所述开关电路，用于当使用所述寄生天线接收或发送射频信号时，将所述寄生天线与所述射频收发电路连接，具体包括，当需要N路接收或发送不同频段的射频信号时，使用K个所述开关电路分别建立K个所述寄生天线与所述射频收发电路的连接，所述N减去所述K为所述M，所述N为大于1的正整数，所述P大于或等于所述K。
  3. 如权利要求1所述的天线切换系统，其特征在于，所述开关电路，还用于：
    当仅使用主天线接收或发送射频信号时，断开所述寄生天线与所述射频收发电路的连接，将所述寄生天线接地。
  4. 如权利要求1所述的天线切换系统，其特征在于，所述开关电路，具体用于：
    当接收到移动终端的调制解调器发送的切换指令时，将所述切换指令指定的寄生天线与所述射频收发电路连接。
  5. 如权利要求3所述的天线切换系统，其特征在于，所述开关电路，具体用于：
    当接收到所述移动终端的调制解调器发送的主天线收发指令时，将所述寄生天线接地。
  6. 如权利要求1至5任一所述的天线切换系统，其特征在于，所述开关电路包括开关端，还包括用于与所述寄生天线连接的天线端；
    所述射频收发电路包括：第二双工器，第二射频功率放大器，以及射频收发器；
    所述第二双工器的接收端接所述的射频收发器的第二码分制式接收端，所述射频收发器的第二码分制式发送端在串联所述第二射频功率放大器后接所述第二双工器的发送端，所述第二双工器的天线端接所述开关电路的开关端；
    所述开关电路，还具体用于：
    当接收到移动终端的调制解调器发送的频段开关指令时，闭合所述开关电路的天线端和与所述频段开关指令指定的第二双工器的天线端连接的开关端。
  7. 如权利要求6所述的天线切换系统，其特征在于，所述射频收发电路还包括：第四射频功率放大器，以及第二声表面滤波器；
    所述射频收发器的第二时分制式发送端在串联所述第四射频功率放大器后接所述开关电路的开关端；
    所述第二声表面滤波器的振动发送端和接收端分别接所述开关电路的开关端和所述射频收发器的第二时分制式接收端。
    所述开关电路，还具体用于：
    当接收到移动终端的调制解调器发送的选择发送指令时，闭合所述开关电路的天线端和与所述选择发送指令指定的第四射频功率放大器连接的开关端；
    当接收到移动终端的调制解调器发送的选择接收指令时，闭合所述开关电路的天线端和与所述选择接收指令指定的第二声表面滤波器的振动发送端。
  8. 如权利要求1所述的天线切换系统，其特征在于，所述射频收发电路还包括：第一双工器，第一射频功率放大器，第三射频功率放大器，第一声表面滤波器，以及单刀多掷开关器；
    所述第一双工器的接收端接所述射频收发器的第一码分制式接收端，所述射频收发器的第一码分制式发送端在串联所述第一射频功率放大器后接所述第一双工器的发送端；
    所述第一双工器的天线端接所述单刀多掷开关器中的开关端，所述单刀多掷开关器的天线端接所述主天线；
    所述射频收发器的第一时分制式发送端在串联所述第三射频功率放大器后接所述单刀多掷开关器中的开关端；
    所述第一声表面滤波器的振动发送端和接收端分别接所述单刀多掷开关器中的开关端和所述射频收发器的第一时分制式接收端；
    所述单刀多掷开关器，用于当接收到所述移动终端的调制解调器发送的开关指令时，闭合所述单刀多掷开关器的天线端和与所述开关指令指定的第一双工器的天线端连接的开关端，或者闭合所述单刀多掷开关器的天线端和与所述开关指令指定的第三射频功率放大器连接的开关端，或者闭合所述单刀多掷开关器的天线端和与所述开关指令指定的第一声表面滤波器连接的开关端。
  9. 如权利要求2所述的天线切换系统，其特征在于，所述开关电路，具体还用于：
    将P个寄生天线中未与所述射频收发电路连接的寄生天线接地。
  10. 一种天线切换方法，其特征在于，所述天线切换方法包括：
    若移动终端的调制解调器接收到基站发送的多路提示，则所述调制解调器根据所述多路提示生成切换指令，将所述切换指令发送至开关电路；
    所述开关电路建立所述切换指令指定的寄生天线与射频收发电路之间的连接。
  11. 如权利要求10所述的天线切换方法，其特征在于，所述天线切换方法包括：
    若所述移动终端的调制解调器接收到基站发送的主天线收发提示，根据所述主天线收发提示生成主天线收发指令，将所述主天线收发指令发送至开关电路；
    所述开关电路断开所述寄生天线与所述射频收发电路的连接，将所述寄生天线接地。
  12. 如权利要求11所述的天线切换方法，其特征在于，所述天线切换方法还包括：
    每隔预设时间段，所述移动终端的调制解调器通过主天线与不同频段的基站建立连接，接收基站发送的广播信息，判断所述广播信息中是否记载有多路提示，判断所述广播信息中是否记载有主天线收发提示。
PCT/CN2014/072142 2014-02-17 2014-02-17 一种天线切换系统以及方法 Ceased WO2015120624A1 (zh)

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CN114915301B (zh) * 2021-02-09 2023-09-05 北京小米移动软件有限公司 天线模组、终端设备、天线调节方法及装置

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CN105075143A (zh) 2015-11-18
EP3089262A1 (en) 2016-11-02
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KR20160106729A (ko) 2016-09-12
EP3089262B1 (en) 2020-03-18

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