WO2018233420A1 - 一种天线电路及移动终端 - Google Patents

一种天线电路及移动终端 Download PDF

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Publication number
WO2018233420A1
WO2018233420A1 PCT/CN2018/087637 CN2018087637W WO2018233420A1 WO 2018233420 A1 WO2018233420 A1 WO 2018233420A1 CN 2018087637 W CN2018087637 W CN 2018087637W WO 2018233420 A1 WO2018233420 A1 WO 2018233420A1
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Prior art keywords
inductor
capacitor
switch
circuit
antenna
Prior art date
Application number
PCT/CN2018/087637
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English (en)
French (fr)
Inventor
李日辉
Original Assignee
维沃移动通信有限公司
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 维沃移动通信有限公司 filed Critical 维沃移动通信有限公司
Priority to EP18820854.0A priority Critical patent/EP3644441B1/en
Priority to US16/625,523 priority patent/US11605888B2/en
Priority to ES18820854T priority patent/ES2930582T3/es
Publication of WO2018233420A1 publication Critical patent/WO2018233420A1/zh

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q23/00—Antennas with active circuits or circuit elements integrated within them or attached to them
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
    • H01Q5/314—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors
    • H01Q5/328—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors between a radiating element and ground
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • 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
    • H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
    • H01Q5/314—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors
    • H01Q5/335—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors at the feed, e.g. for impedance matching
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • 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

Definitions

  • the present disclosure relates to the field of mobile terminal antenna technologies, and in particular, to an antenna circuit and a mobile terminal.
  • multi-CA Carrier Aggregation
  • B5 Low frequency band of 0.96Ghz
  • intermediate frequency (1.71 ⁇ 2.17G)
  • B1 and B3 constitutes a "low frequency + intermediate frequency” CA combination.
  • telecom operators may also introduce a "low frequency + high frequency” CA combination.
  • Multi-CA technology requires that the mobile terminal antenna can support these bands at the same time, instead of the previous time-sharing support, which poses a great challenge to the mobile terminal antenna.
  • the integrated all-metal shape mobile terminal is a U-shaped slit integrated full metal shape, as shown in Figure 2 is a three-stage integrated full metal shape, as shown in Figure 3 for the middle frame metal battery cover
  • the existing antenna scheme is as shown in FIG. 4, and includes: an antenna unit 40, the A point of the antenna unit is the end of the antenna unit 40, and the C point (ie, the feeding point) of the antenna unit is connected to the antenna matching circuit 41, and the antenna is matched.
  • the low frequency/mid-high frequency switching circuit 43 performs the switching between the low frequency and the medium high frequency (the low frequency is 0.7 to 0.96G, and the middle and high frequency is 1.71 to 2.69G). In specific implementation, there is a switch inside, and the low frequency is disconnected, and the high frequency is Turn on.
  • the tuning circuit 44 performs tuning in the low frequency range or in the middle and high frequency (1.71 to 2.69 G), and has a single-pole multi-throw switch inside, and each switching branch is connected with an inductor or a capacitor. By switching different switch branches to ground, low frequency tuning or mid-high frequency tuning can be achieved to cover different frequency band requirements. For example, when the internal switch of the low-frequency/medium-high-frequency switching circuit is turned off, the low-frequency tuning state is entered; as shown in FIG.
  • the switching branch 1 is turned on to cover B12 (0.7 to 0.746G), and the branch 2 is turned on to cover B5 ( 0.824 ⁇ 0.894G), branch 3 conduction covers B8 (0.88 ⁇ 0.96G); when the internal switch of low frequency/medium high frequency switching circuit is turned on, enters the middle and high frequency tuning state; if branch 4 turns on and covers B3+B1 (1.71 ⁇ 2.17G), the branch 5 is covered with B40+B41 (2.3 ⁇ 2.69G).
  • the antenna unit A-C has a length of about 5 to 25 mm
  • the A-B has a length of about 10 to 25 mm
  • the A-E has a length of about 35 to 55 mm
  • the D-E has a length of about 5 to 25 mm
  • the D-B has a distance of more than 15 mm.
  • the existing antenna has insufficient bandwidth of intermediate frequency or high frequency, which affects the performance of the antenna.
  • the embodiments of the present disclosure provide an antenna circuit and a mobile terminal to solve the problem that the bandwidth of the intermediate frequency or the high frequency of the antenna is insufficient, and the performance of the antenna is affected.
  • an embodiment of the present disclosure provides an antenna circuit, including: an antenna unit; a switching circuit connection point and a feeding point are disposed on the antenna unit; and an antenna feed is connected to the feeding point; a first tuning circuit is coupled to the circuit connection point, the first tuning circuit for increasing a single resonant mode bandwidth of the medium and high frequency and/or tuning the resonant frequency of the high frequency; wherein the feed point is to the end of the antenna element The distance is greater than the distance from the switching circuit connection point to the end of the antenna unit.
  • an embodiment of the present disclosure further provides a mobile terminal, including the antenna circuit described above.
  • the feeding point is set closer to the grounding end of the antenna unit, thereby solving the intermediate frequency or high frequency of the antenna.
  • the problem of insufficient bandwidth this way effectively improves the bandwidth of the intermediate frequency and high frequency, and improves the performance of the antenna.
  • FIG. 1 is a schematic view showing the structure of a U-shaped slit integrated all-metal shape mobile terminal
  • FIG. 2 is a schematic structural view of a three-stage integrated all-metal shape mobile terminal
  • FIG. 3 is a schematic structural view of a mobile terminal having a shape of a middle frame metal battery cover
  • Figure 4 is a schematic view showing the structure of an antenna structure
  • FIG. 5 shows a schematic diagram of the composition of the tuning circuit
  • FIG. 6 is a schematic structural diagram of an antenna circuit according to an embodiment of the present disclosure.
  • FIG. 7 is a schematic structural diagram of an antenna circuit according to an embodiment of the present disclosure.
  • Figure 8 is a schematic diagram showing the improvement of the antenna bandwidth
  • Figure 9 shows a schematic diagram of tuning of the intermediate frequency and the high frequency
  • FIG. 10 is a schematic structural diagram of an antenna circuit according to an embodiment of the present disclosure.
  • FIG. 11 is a schematic diagram showing an implementation flow of a CA and a non-CA state of an antenna
  • Figure 12 is a comparison diagram of antenna return loss of B39+B41 of CA and B39 of non-CA;
  • FIG. 13 is a schematic structural diagram of an antenna circuit according to an embodiment of the present disclosure.
  • Figure 14 is a schematic diagram showing the process of changing the impedance of the antenna
  • Figure 15 is a diagram showing a process of changing the return loss
  • FIG. 16 is a schematic structural diagram of an antenna circuit according to an embodiment of the present disclosure.
  • Figure 17 is a schematic diagram showing the process of changing the impedance of the antenna
  • Figure 18 is a schematic diagram showing a process of changing the return loss
  • FIG. 19 is a schematic structural diagram of an antenna circuit according to an embodiment of the present disclosure.
  • FIG. 20 is a schematic structural diagram of an antenna circuit according to an embodiment of the present disclosure.
  • Figure 21 is a diagram showing the tuning of the fourth tuning circuit to the low frequency in the "low frequency + intermediate frequency" CA state;
  • Figure 22 is a diagram showing the tuning of the fourth tuning circuit to the low frequency in the low frequency non-CA state
  • FIG. 23 is a schematic structural diagram of an antenna circuit according to an embodiment of the present disclosure.
  • Figure 24 is a diagram showing the tuning of the fifth tuning circuit for the high frequency resonant mode
  • Figure 25 is a diagram showing the antenna efficiency of the free space of the low frequency + intermediate frequency CA;
  • Figure 26 is a diagram showing the variation of the resonance frequency of the intermediate frequency when the length adjustment inductance is adjusted
  • Figure 27 is a diagram showing the difference in antenna efficiency between the non-CA and CA states of B1 and B3;
  • Figure 28 is a diagram showing the difference in antenna efficiency between the non-CA and CA states of B39 and B41;
  • Figure 29 is a diagram showing the antenna efficiency of the free space of the B8/B1/B3/B40/B41 in the non-CA state
  • FIG. 30 is a schematic structural diagram of a mobile terminal according to an embodiment of the present disclosure.
  • an embodiment of the present disclosure provides an antenna circuit, including: an antenna unit 610; the antenna unit 610 is provided with a switching circuit connection point 611 and a feeding point 612; and the feeding point 612 is connected An antenna feed 620; the switching circuit connection point 611 is connected to a first tuning circuit 630, which is used to increase a single resonant mode bandwidth of the medium and high frequency and/or a resonant frequency of the high frequency in the tuning; The distance from the feeding point 612 to the antenna unit end 613 is greater than the distance from the switching circuit connection point 611 to the antenna unit end 613.
  • the antenna unit 610 has a length of 35 to 60 mm and a typical value of 50 mm. This length significantly affects the resonant frequencies of the low and high frequencies.
  • the distance from the feeding point 612 to the end 613 of the antenna unit is set to be 15 mm to 30 mm, and in some optional embodiments, 23 mm is set; the switching circuit connection point 611 is set to the antenna.
  • the distance from the unit end 613 is from 5 mm to 18 mm, and in some alternative embodiments, is set at 12 mm.
  • the distance from the feeding point 612 to the antenna unit end 613 must be greater than the distance from the switching circuit connection point 611 to the antenna unit end 613.
  • the feeding point 612 is set closer to the antenna unit grounding end 614 (the antenna unit grounding end 614 is the end of the antenna unit)
  • the direction of the opposite end of the 613 is moved, thereby solving the problem that the bandwidth of the intermediate frequency or the high frequency of the antenna is insufficient. In this way, the bandwidth of the intermediate frequency and the high frequency is effectively improved, and the performance of the antenna is improved.
  • the first tuning circuit 630 includes: a first switch 631 , a first inductor 632 , a second inductor 633 , a first capacitor 634 , and a first through line 635 ; wherein the first inductor 632 The first end, the first end of the second inductor 633, the first end of the first capacitor 634, and the first end of the first straight line 635 are connected to each other to form a first connection point, The first connection point is grounded; the first end of the first switch 631 is connected to the switching circuit connection point 611, the second end of the first switch 631 is opposite to the second end of the first inductor 632, Connecting at least one of a second end of the second inductor 633, a second end of the first capacitor 634, and a second end of the first straight-through line 635; or a second end of the first switch 631 The second end of the first inductor 632, the second end of the second inductor 633, the second end of the second end of the first
  • the first tuning circuit 630 when the first tuning circuit 630 is used to increase the bandwidth of the medium-high frequency single resonant mode, the second end of the first switch 631 and the second end of the first inductor 632, the second inductor 633 The second end of the first capacitor 634 is connected to one of the second ends of the first straight line 635.
  • the first tuning circuit 630 is equivalently connected to an inductor. a device, a capacitor device or a resistor device, wherein the inductor device is a fixed inductor, the capacitor device is a fixed capacitor, and the resistor device is a 0 ohm resistor; for example, in B3 (1.71 to 1.88 G), the switching circuit includes 6.8 nH.
  • the switching circuit contains a 0-ohm resistor; in B41, the switching circuit contains an 8.2pf capacitor. It should be noted that the specific value of the device in the switching circuit needs to be determined according to the actual antenna debugging situation.
  • the antenna bandwidth of a single resonant mode can be increased.
  • FIG. 8 it is a schematic diagram of the improvement of the antenna bandwidth, wherein the solid line is a schematic diagram of the standing wave ratio of the existing antenna.
  • the broken line is a schematic diagram of the standing wave ratio of the antenna of the disclosed embodiment.
  • the first tuning circuit 630 When the first tuning circuit 630 is used to tune the resonant frequency of the medium and high frequency to expand the bandwidth of the medium and high frequency, the second end of the first switch 631 and the second end of the first inductor 632, the second inductor a second end of the 633, a second end of the first capacitor 634, and a different one of the second ends of the first straight line 635 are connected, and the first switch 631 is Single-pole multi-throw switch, first inductor 632 is 6.8nH inductor, second inductor 633 is 3.9nH inductor, first capacitor 634 is 8.2pf capacitor, first straight line 635, first inductor 632, second inductor 633 and A capacitor 634 is respectively turned on to operate at B40, B3, B1, B41, and operates at a low frequency when the first through line 635, the first inductor 632, the second inductor 633, and the first capacitor 634 are not turned on.
  • the antenna circuit of the embodiment of the present disclosure further includes: a second tuning circuit 640, the first end of the second tuning circuit 640 is connected to the feeding point 612.
  • the second end of the second tuning circuit 640 is connected to the antenna feed 620; wherein, when the second end of the first switch 631 is opposite to the second end of the first inductor 632, the second The second tuning circuit 640 is used to tune the non-carrier when the second end of the inductor 633, the second end of the first capacitor 634, and the second end of the first straight line 635 are connected IF and/or high frequency bandwidth in the aggregate (CA) state and carrier aggregation state.
  • CA aggregate
  • the mobile terminal system automatically recognizes that the current carrier aggregation or non-carrier aggregation state is based on the base station signal, and then selects a corresponding controller state to control the antenna to be in an optimal antenna state.
  • the specific implementation flow chart is shown in FIG. In addition, this case can also be used for any frequency band with carrier aggregation and non-carrier aggregation, such as B5+B1+B3 carrier aggregation or B1+B3 carrier aggregation.
  • the distance from the feeding point 612 to the antenna unit end 613 is about 10 to 30 mm.
  • the second tuning circuit 640 includes: a second switch 641, a second capacitor 642, and a second through line 643; a first end of the second capacitor 642 and a first end of the second through line 643 Connecting, forming a second connection point, the second connection point is connected to the antenna feed 620; the first end of the second switch 641 is connected to the feed point 612, and the second switch 641 is The second end is connected to the second end of the second capacitor 642 or the second end of the second straight line 643; wherein, when the second end of the first switch 631 is opposite to the second end of the first inductor 632 The second end of the second inductor 633, the second end of the first capacitor 634, and the second end of the first straight line 635 are connected, and the second switch 641 When the second end is connected to the second end of the second straight line 643, the antenna circuit operates in a non-carrier aggregation state.
  • the second switch 641 is a single-pole multi-throw switch, and the second capacitor 642 is a 0.9 pf capacitor.
  • the second through line 643 it is the non-carrier aggregation performance of B39 or B41; when it is set to the second capacitance 642, it is the carrier aggregation state of B39+B41. That is, the intermediate frequency or high frequency distinguishes between two states of carrier aggregation and non-carrier aggregation.
  • the comparison of the antenna return loss of the B39+B41 of CA and the B39 of non-CA shows that the return loss of the non-CA state B39 is better.
  • the antenna circuit further includes: a third inductor 650; wherein the first end of the third inductor 650 and the antenna
  • the unit 610 is connected to the second end of the third inductor 650.
  • the second end of the second switch 641 is connected to the second end of the second capacitor 642.
  • the antenna circuit operates in a carrier aggregation state.
  • the third inductor 650 and the second capacitor 642 are used to change a single resonant mode into two resonant modes, to achieve medium-high frequency carrier aggregation, and to increase the antenna bandwidth.
  • the feed point 612 is added to the second capacitor 642.
  • the general capacitance value is 0.5 to 2 pf (typically 0.9 pf), and the bandwidth can be expanded because the original single resonant mode can become two resonant modes. state.
  • the distance from the connection point 615 of the third inductor 650 to the feed point 612 on the antenna unit 610 is 0-8 mm, and the typical value is 3 mm.
  • the connection point 615 is added to the third inductor 650, and the third inductor 650 can adjust the resonant frequency of the first resonant mode to the B39 band. Generally 0nH ⁇ 25nH, the typical value is 6.8nH. Switching circuit connection point 611 is now connected to a 6.8 nH inductor.
  • the change process of the antenna impedance is as shown in FIG. 14.
  • the "point C” impedance indicates that there is no impedance of the third inductor 650 and the second capacitor 642, and the “parallel inductance” impedance indicates that there is a third inductor 650 but no impedance of the second capacitor 642.
  • the "string small capacitance” impedance indicates the impedance of the third inductance 650 and the second capacitance 642.
  • the change process of return loss is shown in Figure 15 below. It can be seen that after the addition of the third inductor 650 and the second capacitor 642, the original single resonant mode becomes two resonant modes, the first for covering B39 and the second for covering B41.
  • the antenna circuit of the embodiment of the present disclosure further includes: a third tuning circuit 660; the first end of the third tuning circuit 660 is connected to the antenna unit 610, or the first end of the third tuning circuit 660 is The first end of the second capacitor 642 is connected (the latter case is not shown in the figure); the second end of the third tuning circuit 660 is grounded; wherein the third tuning circuit 660 and the second Capacitor 642 is used to generate two resonant modes for the low and mid bands.
  • the third tuning circuit 660 includes: a third switch 661, a fourth inductor 662, and a third capacitor 663; wherein the first end of the third switch 661 is connected to the antenna unit 610, or The first end of the third switch 661 is connected to the first end of the second capacitor 642; the second end of the third switch 661 and the first end of the fourth inductor 662 and the third capacitor 663 At least one of the first ends of the fourth inductor 662 is connected to the second end of the third capacitor 663 to form a third connection point, and the third connection point is grounded.
  • the distance from the feeding point 612 to the end 613 of the antenna unit is required to be 20-30 mm, typically 23 mm, in order to make the intermediate frequency impedance of the feeding point 612 enter the upper half of the smith diagram, and the switching circuit connection point 611 can It is connected or not connected to the first tuning circuit 630, but is equivalent to the low-band open-circuit characteristic.
  • the distance from the feed point 612 to the third tuning circuit 660 at the connection point 615 of the antenna unit 610 is required to be 0 to 8 mm, typically 3 mm.
  • the third capacitor 663 is about 0 to 3 pf (typically 1.2 pf), the fourth inductor 662 is about 12 to 100 nH (typically 18 nH), and the second capacitor 642 is about 0.5 to 2 pf (typically 0.9 pf).
  • the two resonant modes of low frequency and intermediate frequency can be generated to cover the antenna bandwidth required for low frequency + intermediate frequency CA.
  • FIG. 17 is a schematic diagram showing a process of changing the impedance of the antenna
  • FIG. 18 is a schematic diagram showing a process of changing the return loss.
  • the "point C" impedance indicates that there is no impedance curve of the second capacitor 642
  • "and small capacitance and large inductance” indicate that there is a fourth inductance 662 and The third capacitor 663, but without the impedance curve of the second capacitor 642
  • the "string small capacitor” indicates the impedance curve of the second capacitor 642, the fourth inductor 662 and the third capacitor 663. It can be seen that two resonant modes of low frequency and intermediate frequency are realized.
  • the antenna circuit further includes: a length adjustment inductor 670;
  • the first end of the length adjustment inductor 670 is connected to the feed point 612, and the second end of the length adjustment inductor 670 is connected to the first end of the second capacitor 642.
  • the typical value is 6nH (can also be replaced by the transmission line of the equivalent value), so that the intermediate frequency impedance enters the upper part.
  • the antenna circuit of the embodiment of the present disclosure further includes: a fourth tuning circuit 680; the first end of the fourth tuning circuit 680 is connected to the antenna unit 610, The second end of the fourth tuning circuit 680 is grounded; wherein the fourth tuning circuit 680 and the second capacitor 642 are used to implement low frequency and low frequency tuning.
  • the second end of the first switch 631 and the second end of the first inductor 632, the second end of the second inductor 633, and the first capacitor 634 The second end of the second switch 635 is not connected to the second end of the first straight line 635, and the second end of the second switch 641 is connected to the second end of the second capacitor 642.
  • the fourth tuning circuit 680 includes: a fourth switch 681, a fifth inductor 682, a sixth inductor 683, and a fourth capacitor 684; wherein the first end of the fifth inductor 682 and the sixth inductor The first end of the 683 and the first end of the fourth capacitor 684 are connected to each other to form a fifth connection point.
  • the fifth connection point is grounded.
  • the first end of the fourth switch 681 is connected to the antenna unit 610.
  • the second end of the fourth switch 681 is connected to at least one of the second end of the fifth inductor 682, the second end of the sixth inductor 683, and the second end of the fourth capacitor 684 .
  • a second capacitor 642 in order to achieve low frequency, a second capacitor 642 must have a capacitance value of 0.5 to 2 pf (typically 0.9 pf).
  • the fourth tuning circuit 680 can have multiple branches internally, switching different branches to tune the low frequencies.
  • the fourth switch 681 is a single-pole multi-throw switch
  • the fifth inductor 682 is 18nH
  • the sixth inductor 683 is 15nH
  • the fourth capacitor 684 is 1.2pf capacitor.
  • the tuning diagram of the fourth tuning circuit 680 for low frequency is shown in Figure 21; in the low frequency non-carrier aggregation state (such as B12/) B5/B8), the tuning diagram of the fourth tuning circuit 680 for low frequency is shown in FIG.
  • the third tuning circuit when the third tuning circuit is included in the antenna circuit, the third tuning circuit and the fourth tuning circuit are connected to the same position or different positions of the antenna unit;
  • the first merge coordination circuit includes:
  • a first merge switch a first combined inductor, a second combined inductor, and a first merged capacitor; a first end of the first combined inductor, a first end of the second combined inductor, and a first combined capacitor One end is connected to each other to form a first merged connection point, and the first merged connection point is grounded; a first end of the first merge switch is connected to the antenna unit, and a second end of the first merge switch is Connecting at least one of a second end of the first combined inductor, a second end of the second combined inductor, and a second end of the first merged capacitor; when the second end of the first merge switch is When the second end of the first combined capacitor is connected, the first combined capacitor and the second capacitor are used to generate two resonant modes of a low frequency band and a middle frequency band; and the first combined inductor and the second combined inductor are used The tuning frequency of the low frequency band is tuned.
  • the antenna circuit of the embodiment of the present disclosure further includes: a fifth tuning circuit 690; wherein the first end of the fifth tuning circuit 690 and the antenna unit 610 is connected, the second end of the fifth tuning circuit 690 is grounded; and the fifth tuning circuit 690 is used to increase the mid-high frequency tuning range.
  • the fifth tuning circuit 690 includes: a fifth switch 691, a seventh inductor 692, and a fifth capacitor 693; wherein, the first end of the seventh inductor 692 and the first end of the fifth capacitor 693 Connected to form a sixth connection point, the sixth connection point is grounded; a first end of the fifth switch 691 is connected to the antenna unit 610, and a second end of the fifth switch 691 is connected to the seventh At least one of the second end of the inductor 692 and the second end of the fifth capacitor 693 are coupled.
  • the second end of the first switch 631 and the second end of the first inductor 632, the second end of the second inductor 633, and the second end of the first capacitor 634 Connected to at least one of the second ends of the first straight-through line 635, and the second end of the second switch 641 is coupled to the second straight-through line 643.
  • the fifth tuning circuit 690 can be implemented in the third tuning circuit 660 when implemented.
  • the third inductor and the fifth tuning circuit are connected to the same position or different positions of the antenna unit; wherein, when the third When the inductor and the fifth tuning circuit are connected to the same position of the antenna unit, the third inductor and the fifth tuning circuit are combined to form a second merge coordination circuit, and the second merge coordination circuit includes: a second merge switch, a third merged inductor, a fourth combined inductor, and a second merged capacitor; a first end of the third combined inductor, a first end of the fourth combined inductor, and a first of the second combined capacitor The ends are connected to each other to form a second merged connection point, the second merged connection point is grounded; the first end of the second merge switch is connected to the antenna unit, and the second end of the second merge switch is At least one of the second end of the third combined inductor, the second end of the fourth combined inductor, and the second end of the second merged capacitor are coupled.
  • the switching circuit connection point 611 is connected to an 8.2 pf capacitor, and the fifth tuning circuit 690 is set to connect an inductance having an inductance value of 3.9 nH, so that the high frequency resonance mode can be moved to a higher frequency direction. Conversely, if it is set to a parallel capacitor, it moves in a lower frequency direction.
  • each function implemented by the antenna circuit described in the present disclosure can be used in combination to jointly implement the function of the antenna.
  • the antenna efficiency of the free space of the low frequency + intermediate frequency CA "1-FS-B12+B3+B1" in Fig. 25 represents the antenna efficiency of the CA state of B12+B3+B1, and the third tuning at this time
  • the circuit 660 is internally set to 1.2 pf, the second tuning circuit 640 is set to 0.9 pf, and the first tuning circuit 630 is set to open; "3-FS-B5+B3+B1" indicates the antenna efficiency of the CA state of B5+B3+B1.
  • the third tuning circuit 660 is set to a parallel circuit of 1.2pf+18nH, the second tuning circuit 640 is set to 0.9pf, and the first tuning circuit 630 is set to be open.
  • B8+B3+B1 can also be realized.
  • the third tuning circuit 660 is only required to be a parallel circuit of 1.2pf+15nH, the second tuning circuit 640 is set to 0.9pf, and the first tuning circuit 630 is set to be open.
  • the length adjustment inductance is equal to 3nH.
  • the effect of adjusting the length adjustment inductance As shown in Figure 26, the effect of adjusting the length adjustment inductance.
  • the resonant frequency of the intermediate frequency can be effectively adjusted.
  • the "original” in the figure below indicates the CA state of B5+B1+B3
  • there is no antenna efficiency of the length adjustment inductor and "increase the length adjustment inductance” means the CA state of B5+B1+B3.
  • the length adjustment inductance is equal to the antenna efficiency of 6nH.
  • the third tuning circuit 660 is set to 6.8 nH
  • the second tuning circuit 640 is set to pass
  • the first tuning circuit 630 is set to 6.8 nH (corresponding to B3), 4.7 nH (corresponding to B1+B3), and 3.9 nH (corresponding to B1). .
  • Fig. 28 it is the difference in antenna efficiency of the free space of the non-CA and CA states of B39 and B41.
  • "7-FS-B39” and “9-FS-B41” and “10-FS-B39+B41” respectively indicate the antenna efficiency of B39 in the non-CA state, B41 in the non-CA state, and B39+B41 in the CA state. It can be seen that the B39 efficiency of the non-CA is about 1-2 dB higher than the B39 of the CA state, and the B41 efficiency of the non-CA is about 1-2 dB higher than the B41 of the CA state.
  • the third tuning circuit 660 is set to 6.8 nH
  • the second tuning circuit 640 is set to 0.9 pf
  • the first tuning circuit 630 is set to 6.8 nH
  • the third tuning circuit 660 is set to 6.8.
  • the second tuning circuit 640 is set to pass through
  • the first tuning circuit 630 is set to 6.8 nH (corresponding to B39), 8.2 pf (corresponding to B41), and the length adjustment inductance is equal to 3 nH.
  • FIG. 29 it is an antenna efficiency map of free space of B8/B1/B3/B40/B41 in a non-CA state.
  • "2-FS-B8”, “5-FS-B1”, “6-FS-B3”, “8-FS-B40”, and “9-FS-B41” respectively indicate B8, B1, B3 of non-CA, Antenna efficiency of B40 and B41.
  • the third tuning circuit 660 is set to 15nH
  • the second tuning circuit 640 is set to 0.9pf
  • the first tuning circuit 630 is set to open
  • the length adjusting inductance is equal to 3nH.
  • the third tuning circuit 660 is set to 6.8 nH
  • the second tuning circuit 640 is set to pass through
  • the first tuning circuit 630 is set to 6.8 nH (corresponding to B3) and 3.9 nH (corresponding to B1), respectively.
  • 0 ohm (corresponding to B40), 8.2pf (corresponding to B41), and the length adjustment inductance is equal to 3nH.
  • the above solution of the present disclosure can effectively improve the bandwidth of the single resonant mode of the intermediate frequency and the high frequency, expand the bandwidth of the intermediate frequency and the high frequency, and simultaneously realize the low frequency and expand the bandwidth of the low frequency, thereby improving the performance of the antenna as a whole.
  • An embodiment of the present disclosure further provides a mobile terminal, including the antenna circuit described above.
  • the mobile terminal provided with the antenna circuit improves the communication performance of the mobile terminal and improves the user experience.
  • FIG. 30 is a schematic structural diagram of a mobile terminal according to an embodiment of the present disclosure.
  • the mobile terminal in FIG. 30 may be a mobile phone, a tablet computer, a personal digital assistant (PDA), or an in-vehicle computer.
  • PDA personal digital assistant
  • the mobile terminal in FIG. 30 includes a radio frequency (RF) circuit 3010, a memory 3020, an input unit 3030, a display unit 3040, a processor 3050, an audio circuit 3060, a WiFi (Wireless Fidelity) module 3070, and a power source 3080.
  • RF radio frequency
  • the input unit 3030 can be configured to receive numeric or character information input by the user, and generate signal input related to user settings and function control of the mobile terminal.
  • the input unit 3030 may include a touch panel 3031.
  • the touch panel 3031 also referred to as a touch screen, can collect touch operations on or near the user (such as the operation of the user using any suitable object or accessory such as a finger or a stylus on the touch panel 3031), and according to the preset The programmed program drives the corresponding connection device.
  • the touch panel 3031 can include two parts: a touch detection device and a touch controller.
  • the touch detection device detects the touch orientation of the user, and detects a signal brought by the touch operation, and transmits the signal to the touch controller; the touch controller receives the touch information from the touch detection device, converts the touch information into contact coordinates, and sends the touch information.
  • the processor 3050 is provided and can receive commands from the processor 3050 and execute them.
  • the touch panel 3031 can be implemented in various types such as resistive, capacitive, infrared, and surface acoustic waves.
  • the input unit 3030 may further include other input devices 3032, which may include, but are not limited to, physical keyboards, function keys (such as volume control buttons, switch buttons, etc.), trackballs, mice, joysticks, and the like. One or more of them.
  • the display unit 3040 can be used to display information input by the user or information provided to the user and various menu interfaces of the mobile terminal.
  • the display unit 3040 can include a display panel 3041.
  • the display panel 3041 can be configured in the form of an LCD or an Organic Light-Emitting Diode (OLED).
  • the touch panel 3031 may cover the display panel 3041 to form a touch display screen, and when the touch display screen detects a touch operation on or near it, it is transmitted to the processor 3050 to determine the type of the touch event, and then the processor The 3050 provides a corresponding visual output on the touch display depending on the type of touch event.
  • the touch display includes an application interface display area and a common control display area.
  • the arrangement manner of the application interface display area and the display area of the common control is not limited, and the arrangement manner of the two display areas can be distinguished by up-and-down arrangement, left-right arrangement, and the like.
  • the application interface display area can be used to display the interface of the application. Each interface can contain interface elements such as at least one application icon and/or widget desktop control.
  • the application interface display area can also be an empty interface that does not contain any content.
  • the common control display area is used to display controls with high usage, such as setting buttons, interface numbers, scroll bars, phone book icons, and the like.
  • the processor 3050 is a control center of the mobile terminal, and connects various parts of the entire mobile phone by using various interfaces and lines, by running or executing software programs and/or modules stored in the first memory 3021, and calling the second memory.
  • the data in 3022 performs various functions and processing data of the mobile terminal, thereby performing overall monitoring on the mobile terminal.
  • processor 3050 can include one or more processing units.
  • the radio frequency (RF) circuit 3010 includes: an antenna unit; the antenna unit is provided with a switching circuit connection point and a feeding point; and the feeding point is connected with an antenna feed; the switching a first tuning circuit is coupled to the circuit connection point, the first tuning circuit for increasing a single resonant mode bandwidth of the medium and high frequency and/or tuning the resonant frequency of the high frequency; wherein the feed point is to the end of the antenna element The distance is greater than the distance from the switching circuit connection point to the end of the antenna unit.
  • the first tuning circuit includes: a first switch, a first inductor, a second inductor, a first capacitor, and a first through line; wherein the first end of the first inductor, the second The first end of the inductor, the first end of the first capacitor, and the first end of the first straight line are connected to each other to form a first connection point, the first connection point is grounded; the first switch The first end is connected to the switching circuit connection point, the second end of the first switch is opposite to the second end of the first inductor, the second end of the second inductor, and the second end of the first capacitor The end is connected to at least one of the second ends of the first straight line; or the second end of the first switch is opposite to the second end of the first inductor and the second end of the second inductor The second end of the first capacitor and the second end of the first straight line are not connected; when the second end of the first switch is opposite to the second end of the first inductor, the first When at least one of the second end of the second end of
  • the radio frequency (RF) circuit 3010 further includes: a second tuning circuit, where the first end of the second tuning circuit is connected to the feeding point, the a second end of the second tuning circuit is coupled to the antenna feed; wherein, when the second end of the first switch is opposite to the second end of the first inductor, the second end of the second inductor, When the second end of the first capacitor is connected to at least one of the second ends of the first straight line, the second tuning circuit is used to tune the intermediate frequency in the non-carrier aggregation state and the carrier aggregation state. Or high frequency bandwidth.
  • the second tuning circuit includes: a second switch, a second capacitor, and a second straight line; the first end of the second capacitor is connected to the first end of the second straight line to form a second connection Point, the second connection point is connected to the antenna feed; the first end of the second switch is connected to the feed point, and the second end of the second switch is opposite to the second capacitor a second end or a second end of the second straight line is connected; wherein, when the second end of the first switch is opposite to the second end of the first inductor, the second end of the second inductor, When at least one of the second end of the first capacitor and the second end of the first straight line is connected, and the second end of the second switch is connected to the second end of the second straight line,
  • the antenna circuit operates in a non-carrier aggregation state.
  • the radio frequency (RF) circuit 3010 further includes: a third inductor; wherein the first end of the third inductor is The antenna unit is connected, the second end of the third inductor is grounded; the second end of the second switch is connected to the second end of the second capacitor, and the antenna circuit operates in a carrier aggregation state,
  • the third inductance and the second capacitance are used to change a single resonant mode to two resonant modes.
  • the radio frequency (RF) circuit 3010 further includes: a third tuning circuit; the first end of the third tuning circuit is connected to the antenna unit, or the a first end of the third tuning circuit is coupled to the first end of the second capacitor; a second end of the third tuning circuit is grounded; wherein the third tuning circuit and the second capacitor are used to generate a low frequency band And two resonant modes of the mid-band.
  • the third tuning circuit includes: a third switch, a fourth inductor, and a third capacitor; wherein a first end of the third switch is connected to the antenna unit, or a third switch One end is connected to the first end of the second capacitor; the second end of the third switch is connected to at least one of the first end of the fourth inductor and the first end of the third capacitor; The second end of the fourth inductor is coupled to the second end of the third capacitor to form a third connection point, and the third connection point is grounded.
  • the radio frequency (RF) circuit 3010 further includes: a length adjustment inductor; wherein the first end of the length adjustment inductor is connected to the feed point, the length A second end of the adjustment inductor is coupled to the first end of the second capacitor.
  • the radio frequency (RF) circuit 3010 further includes: a fourth tuning circuit; the first end of the fourth tuning circuit is connected to the antenna unit, and the fourth The second end of the tuning circuit is grounded; wherein the fourth tuning circuit and the second capacitor are used to implement low frequency and low frequency tuning.
  • the fourth tuning circuit includes: a fourth switch, a fifth inductor, a sixth inductor, and a fourth capacitor; wherein, the first end of the fifth inductor, the first end of the sixth inductor, and the The first ends of the fourth capacitor are connected to each other to form a fifth connection point, and the fifth connection point is grounded;
  • a first end of the fourth switch is connected to the antenna unit, a second end of the fourth switch is opposite to a second end of the fifth inductor, a second end of the sixth inductor, and the fourth At least one of the second ends of the capacitors are connected.
  • a merge coordination circuit when the third tuning circuit is included in the antenna circuit, the third tuning circuit and the fourth tuning circuit are connected to the same position or different positions of the antenna unit; When the third tuning circuit and the fourth tuning circuit are connected to the same position of the antenna unit, the third tuning circuit and the fourth tuning circuit are combined to form a first merge coordination circuit, a merge coordination circuit includes: a first merge switch, a first merge inductor, a second merge inductor, and a first merge capacitor; a first end of the first combined inductor, a first end of the second combined inductor, and the The first ends of the first merged capacitor are connected to each other to form a first merged connection point, and the first merged connection point is grounded; the first end of the first merge switch is connected to the antenna unit, and the first merge switch Connecting the second end to at least one of the second end of the first combined inductor, the second end of the second merged inductor, and the second end of the first merged capacitor; when the first merge Switch number When the terminal is connected to the
  • a second end of the first switch, a second end of the first inductor, a second end of the second inductor, and a second end of the first capacitor further includes: a fifth tuning circuit; wherein the first end of the fifth tuning circuit Connected to the antenna unit, the second end of the fifth tuning circuit is grounded; the fifth tuning circuit is used to increase the mid-high frequency tuning range.
  • the fifth tuning circuit includes: a fifth switch, a seventh inductor, and a fifth capacitor; wherein the first end of the seventh inductor is connected to the first end of the fifth capacitor to form a sixth a connection point, the sixth connection point is grounded; a first end of the fifth switch is connected to the antenna unit, a second end of the fifth switch is opposite to a second end of the seventh inductor, and the At least one of the second ends of the five capacitors are connected.
  • the third inductor and the fifth tuning circuit are connected at the same position or different positions of the antenna unit;
  • the third inductor and the fifth tuning circuit are combined to form a second merge coordination circuit, and the second merge coordination circuit
  • the second combining switch, the third combined inductor, the fourth combined inductor and the second combined capacitor; the first end of the third combined inductor, the first end of the fourth combined inductor, and the second combined capacitor The first ends are connected to each other to form a second merged connection point, the second merged connection point is grounded; the first end of the second merge switch is connected to the antenna unit, and the second end of the second merge switch And connecting at least one of a second end of the third combined inductor, a second end of the fourth combined inductor, and a second end of the second merged capacitor.
  • the distance from the feeding point to the end of the antenna unit is 15 mm to 30 mm, and the distance from the switching circuit connection point to the end of the antenna unit is 5 mm to 18 mm.
  • the mobile terminal of the embodiment of the present disclosure solves the intermediate frequency or high frequency of the antenna by moving the switching circuit connection point of the antenna unit and the feeding point exchange position to move the feeding point closer to the grounding end of the antenna unit.
  • the problem of insufficient bandwidth expands the bandwidth of the intermediate frequency and high frequency, and also realizes the low frequency and expands the bandwidth of the low frequency, thereby improving the performance of the antenna as a whole, thereby improving the communication performance of the mobile terminal and improving the user's Use experience.
  • embodiments of the disclosed embodiments can be provided as a method, apparatus, or computer program product.
  • embodiments of the present disclosure can take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware aspects.
  • embodiments of the present disclosure may take the form of a computer program product embodied on one or more computer usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) including computer usable program code.
  • Embodiments of the present disclosure are described with reference to flowchart illustrations and/or block diagrams of a method, a terminal device (system), and a computer program product according to an embodiment of the present disclosure. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG.
  • These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor or other programmable data processing terminal device to produce a machine such that instructions are executed by a processor of a computer or other programmable data processing terminal device
  • Means are provided for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing terminal device to operate in a particular manner, such that instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the instruction device implements the functions specified in one or more blocks of the flow or in a flow or block diagram of the flowchart.

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Abstract

本公开提供了一种天线电路及移动终端。该天线电路包括：天线单元；所述天线单元上设置有切换电路连接点和馈电点；所述馈电点上连接有天线馈源；所述切换电路连接点连接有第一调谐电路，所述第一调谐电路用于增大中高频的单个谐振模态带宽和/或调谐中高频的谐振频率；其中，所述馈电点至天线单元末端的距离大于所述切换电路连接点至所述天线单元末端的距离。

Description

一种天线电路及移动终端
相关申请的交叉引用
本申请主张在2017年6月22日在中国提交的中国专利申请号No.201710481298.6的优先权，其全部内容通过引用包含于此。
技术领域
本公开涉及移动终端天线技术领域，尤其涉及一种天线电路及移动终端。
背景技术
为了提升移动终端的上网速率，多CA(载波聚合)技术得到普及，例如中国移动的B39+B41的“中频+高频”CA组合，还有近期中国的电信运营商又提出了低频(0.7～0.96Ghz)的某一个频段如B5，结合中频(1.71～2.17G)如B1和B3，构成“低频+中频”CA组合。未来，电信运营商还有可能推出“低频+高频”CA组合。多CA技术要求移动终端天线能够同时支持这些频段，而不是之前的分时支持，这给移动终端天线带来很大挑战。
近年来，一体式全金属外形(例如三段式一体化金属外形，U形缝隙一体化金属外形)的移动终端得到了市场的青睐，但是这种外观也给天线带来了很大挑战，因为这种外观的中频和高频的天线带宽往往很窄。如何实现多CA天线仍是行业内的难点问题。
一体式全金属外形的移动终端，如图1所示为U形缝隙一体化全金属外形，如图2所示为三段式一体化全金属外形，如图3所示为中框金属电池盖外形；现有的天线方案如图4所示，包括：天线单元40，天线单元的A点为天线单元40的末端，天线单元的C点(即馈电点)连接天线匹配电路41，天线匹配电路41的一端连接天线馈源42；天线单元的B点(即切换电路连接点)连接低频/中高频切换电路43，天线单元40的D电连接调谐电路44，天线单元的E电接地；其中，低频/中高频切换电路43完成低频与中高频的切换(低频是0.7～0.96G，中高频是1.71～2.69G)，具体实现上，其内部有一个开关，低频时断开，高频时导通。调谐电路44实现低频范围内调谐或中高 频(1.71～2.69G)范围内的调谐，其内部有一个单刀多掷开关，每个开关支路连接有电感或电容等器件。通过切换不同的开关支路至接地，可实现低频的调谐或者中高频的调谐，以覆盖不同的频段需求。例如，当低频/中高频切换电路的内部开关断开时，进入低频调谐状态；如图5所示，开关支路1导通覆盖B12(0.7～0.746G)，支路2导通覆盖B5(0.824～0.894G)，支路3导通覆盖B8(0.88～0.96G)；当低频/中高频切换电路的内部开关导通时，进入中高频调谐状态；如支路4导通覆盖B3+B1(1.71～2.17G)，支路5导通覆盖B40+B41(2.3～2.69G)。一般来说，在移动终端中，天线单元A-C长度约5～25mm，A-B长度约10～25mm，A-E约35～55mm，D-E长度约5～25mm，D-B的距离一般大于15mm。
但是，现有的天线存在中频或高频的带宽不足，影响天线性能的问题。
发明内容
本公开实施例提供一种天线电路及移动终端，以解决天线的中频或高频的带宽不足，存在影响天线性能的问题。
第一方面，本公开实施例提供一种天线电路，包括：天线单元；所述天线单元上设置有切换电路连接点和馈电点；所述馈电点上连接有天线馈源；所述切换电路连接点连接有第一调谐电路，所述第一调谐电路用于增大中高频的单个谐振模态带宽和/或调谐中高频的谐振频率；其中，所述馈电点至天线单元末端的距离大于所述切换电路连接点至所述天线单元末端的距离。
第二方面，本公开实施例还提供一种移动终端，包括上述的天线电路。
这样，本公开实施例中，通过将天线单元的切换电路连接点和馈电点交换位置，将馈电点设置的更靠近天线单元接地端的方向移动，以此解决了天线的中频或高频的带宽不足的问题，此种方式，有效的改善了中频和高频的带宽，提高了天线的性能。
附图说明
为了更清楚地说明本公开实施例的技术方案，下面将对本公开实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅 是本公开的一些实施例，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表示U形缝隙一体化全金属外形的移动终端结构示意图；
图2表示三段式一体化全金属外形的移动终端结构示意图；
图3表示中框金属电池盖外形的移动终端结构示意图；
图4表示天线结构的组成示意图；
图5表示调谐电路的组成示意图；
图6表示本公开一实施例的天线电路的结构示意图；
图7表示本公开一实施例的天线电路的结构示意图；
图8表示天线带宽的改善情况示意图；
图9表示中频和高频的调谐示意图；
图10表示本公开一实施例的天线电路的结构示意图；
图11表示天线的CA与非CA状态的实现流程示意图；
图12为CA的B39+B41和非CA的B39的天线回波损耗对比图；
图13表示本公开一实施例的天线电路的结构示意图；
图14表示天线阻抗变化过程示意图；
图15表示回波损耗的变化过程示意图；
图16表示本公开一实施例的天线电路的结构示意图；
图17所示为天线阻抗变化过程示意图；
图18表示回波损耗的变化过程示意图；
图19表示本公开一实施例的天线电路的结构示意图；
图20表示本公开一实施例的天线电路的结构示意图；
图21表示在“低频+中频”CA状态下，第四调谐电路对低频的调谐示意图；
图22表示在低频非CA状态下，第四调谐电路对低频的调谐示意图；
图23表示本公开一实施例的天线电路的结构示意图；
图24表示第五调谐电路对高频谐振模态的调谐示意图；
图25表示低频+中频CA的自由空间的天线效率示意图；
图26表示调整长度调节电感时，中频的谐振频率变化示意图；
图27表示B1和B3的非CA和CA状态的天线效率差异示意图；
图28表示B39和B41的非CA和CA状态的天线效率差异示意图；
图29表示非CA状态的B8/B1/B3/B40/B41的自由空间的天线效率图；
图30表示本公开实施例的移动终端的结构示意图。
具体实施方式
下面将结合本公开实施例中的附图，对本公开实施例中的技术方案进行清楚、完成地描述，显然，所描述的实施例仅仅是本公开一部分实施例，而不是全部的实施例。基于本公开中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本公开保护的范围。
如图6所示，本公开实施例提供一种天线电路，包括：天线单元610；所述天线单元610上设置有切换电路连接点611和馈电点612；所述馈电点612上连接有天线馈源620；所述切换电路连接点611连接有第一调谐电路630，所述第一调谐电路630用于增大中高频的单个谐振模态带宽和/或调谐中高频的谐振频率；其中，所述馈电点612到天线单元末端613的距离大于所述切换电路连接点611至所述天线单元末端613的距离。
一般，天线单元610的长度35～60mm，典型值50mm。此长度会显著影响低频和高频的谐振频率。本实施例中，设置馈电点612到所述天线单元末端613的距离为15毫米至30毫米，在一些可选的实施例中，设置为23毫米；设置切换电路连接点611至所述天线单元末端613的距离为5毫米至18毫米，在一些可选的实施例中，设置为12毫米。本实施例中，要求馈电点612到所述天线单元末端613的距离必须大于切换电路连接点611至所述天线单元末端613的距离。
本实施例中，通过将天线单元610的切换电路连接点611和馈电点612交换位置，将馈电点612设置的更靠近天线单元接地端614(该天线单元接地端614为与天线单元末端613相对的一端)的方向移动，以此解决了天线的中频或高频的带宽不足的问题，此种方式，有效的改善中频和高频的带宽，提高了天线的性能。
继续如图7所示，该第一调谐电路630包括：第一开关631、第一电感 632、第二电感633、第一电容634和第一直通线635；其中，所述第一电感632的第一端、所述第二电感633的第一端、所述第一电容634的第一端、所述第一直通线635的第一端互相连接，形成第一连接点，所述第一连接点接地；所述第一开关631的第一端与所述切换电路连接点611连接，所述第一开关631的第二端与所述第一电感632的第二端、所述第二电感633的第二端、所述第一电容634的第二端和所述第一直通线635的第二端中的至少一者连接；或者所述第一开关631的第二端与所述第一电感632的第二端、所述第二电感633的第二端、所述第一电容634的第二端和所述第一直通线635的第二端均不连接；当所述第一开关631的第二端与所述第一电感632的第二端、所述第二电感633的第二端、所述第一电容634的第二端和所述第一直通线635的第二端中的至少一者连接时，用于增大中高频单个谐振模态的带宽；当所述第一开关631的第二端与所述第一电感632的第二端、所述第二电感633的第二端、所述第一电容634的第二端和所述第一直通线635的第二端中的不同的一者或不同的多者连接时，用于调谐中高频的谐振频率。
需要说明的是，当第一调谐电路630用于增大中高频单个谐振模态的带宽，第一开关631的第二端与所述第一电感632的第二端、所述第二电感633的第二端、所述第一电容634的第二端和所述第一直通线635的第二端中的一者连接，在此种情况下，第一调谐电路630等效连接一个电感器件、电容器件或电阻器件，其中，该电感器件为固定电感，电容器件为固定电容，电阻器件为0欧电阻；例如，在B3(1.71～1.88G)时，切换电路中包含的是6.8nH电感；B40时，切换电路中包含的是0欧电阻；B41时，切换电路中包含的是8.2pf电容。需要说明的是，切换电路中器件的具体值需根据实际天线调试情况确定。
需要说明的是，在此种情况下，可增加单个谐振模态的天线带宽，例如，如图8所示，为天线带宽的改善情况示意图，其中，实线为现有天线的驻波比示意图，虚线为本公开实施例的天线的驻波比示意图。
当第一调谐电路630用于调谐中高频的谐振频率，以拓展中高频的带宽时，所述第一开关631的第二端与所述第一电感632的第二端、所述第二电感633的第二端、所述第一电容634的第二端和所述第一直通线635的第二 端中的不同的一者或不同的多者连接，此时，第一开关631为单刀多掷开关，第一电感632为6.8nH电感，第二电感633为3.9nH电感，第一电容634为8.2pf电容，第一直通线635、第一电感632、第二电感633和第一电容634分别导通工作于B40、B3、B1、B41，当第一直通线635、第一电感632、第二电感633和第一电容634均不导通时，工作于低频。
在此种情况下，对中频和高频的调谐示意图如图9所示(已实现了四个调谐状态)。
在一些可选的实施例中，如图10所示，本公开实施例的天线电路还包括：第二调谐电路640，所述第二调谐电路640的第一端与所述馈电点612连接，所述第二调谐电路640的第二端与所述天线馈源620连接；其中，当所述第一开关631的第二端与所述第一电感632的第二端、所述第二电感633的第二端、所述第一电容634的第二端和所述第一直通线635的第二端中的至少一者连接时，所述第二调谐电路640用于调谐非载波聚合(CA)状态下和载波聚合状态下的中频和/或高频的带宽。
需要说明的是，为了提高非载波聚合的天线性能，只需天线具有可调能力，且状态1为载波聚合性能好，状态2为非载波聚合性能好。例如，假设状态1为载波聚合的B39+B41性能好，而状态2为非载波聚合的B39或者B41性能好。则移动终端系统根据基站信号自动识别到目前为载波聚合或者非载波聚合状态，然后选择对应的控制器状态，控制天线处于最佳的天线状态。具体实现流程图如图11所示。另外，此种情况也可以用于任一具有载波聚合和非载波聚合的频段，如B5+B1+B3载波聚合或者B1+B3载波聚合等。
在此种情况下，馈电点612至天线单元末端613的距离约10～30mm。
具体地，所述第二调谐电路640包括：第二开关641、第二电容642和第二直通线643；所述第二电容642的第一端与所述第二直通线643的第一端连接，形成第二连接点，所述第二连接点与所述天线馈源620连接；所述第二开关641的第一端与所述馈电点612连接，所述第二开关641的第二端与所述第二电容642的第二端或所述第二直通线643的第二端连接；其中，当所述第一开关631的第二端与所述第一电感632的第二端、所述第二电感633的第二端、所述第一电容634的第二端和所述第一直通线635的第二端 中的至少一者连接，且所述第二开关641的第二端与所述第二直通线643的第二端连接时，所述天线电路工作于非载波聚合状态。
需要说明的是，该第二开关641为单刀多掷开关，第二电容642为0.9pf电容。当设置为第二直通线643时，为B39或B41的非载波聚合性能；当设置为第二电容642时，为B39+B41的载波聚合状态。即中频或者高频时区分载波聚合和非载波聚合的两种状态。
如图12所示，为CA的B39+B41和非CA的B39的天线回波损耗对比图，显然非CA状态B39的回波损耗更好。
需要说明的是，当所述第一开关631的第二端与所述第一电感632的第二端、所述第二电感633的第二端、所述第一电容634的第二端和所述第一直通线635的第二端均不连接，且所述第二开关641的第二端与所述第二电容642的第二端连接时，产生低频段的谐振模态。
在上述情况下，为了进一步实现中频和高频载波聚合，如图13所示，所述天线电路，还包括：第三电感650；其中，所述第三电感650的第一端与所述天线单元610连接，所述第三电感650的第二端接地；所述第二开关641的第二端与所述第二电容642的第二端连接，所述天线电路工作于载波聚合状态，所述第三电感650和所述第二电容642用于：将单个谐振模态变为两个谐振模态，实现中高频载波聚合，增大天线带宽。
在此种情况下，馈电点612加入第二电容642，一般电容值为0.5～2pf(典型值0.9pf)，可拓展频宽，原因是原先的单个谐振模态可以变成两个谐振模态。所述天线单元610上第三电感650的连接点615至所述馈电点612的距离0～8mm，典型值3mm。连接点615加入第三电感650，第三电感650可调节第一个谐振模态的谐振频率至B39频段。一般0nH～25nH，典型值6.8nH。切换电路连接点611此时连接6.8nH电感。
天线阻抗的变化过程如图14所示，“C点”阻抗表示没有第三电感650和第二电容642的阻抗，“并电感”阻抗表示有第三电感650但没有第二电容642的阻抗，“串小电容”阻抗表示有第三电感650和第二电容642的阻抗。回波损耗的变化过程如下图15所示。可见，加入第三电感650和第二电容642后，由原先的单个谐振模态变成了两个谐振模态，第一个用于覆盖B39， 第二个用于覆盖B41。
为了实现低频和中频的载波聚合，当所述第一开关631的第二端与所述第一电感632的第二端、所述第二电感633的第二端、所述第一电容634的第二端和所述第一直通线635的第二端均不连接，且所述第二开关641的第二端与所述第二电容642的第二端连接时，如图16所示，本公开实施例的天线电路还包括：第三调谐电路660；所述第三调谐电路660的第一端与所述天线单元610连接，或者所述第三调谐电路660的第一端与所述第二电容642的第一端连接(后一种情况未在图中示出)；所述第三调谐电路660的第二端接地；其中，所述第三调谐电路660和所述第二电容642用于产生低频段和中频段的两个谐振模态。
具体地，所述第三调谐电路660，包括：第三开关661、第四电感662和第三电容663；其中，所述第三开关661的第一端与所述天线单元610连接，或者所述第三开关661的第一端与所述第二电容642的第一端连接；所述第三开关661的第二端与所述第四电感662的第一端和所述第三电容663的第一端中的至少一者连接；所述第四电感662的第二端和所述第三电容663的第二端连接，形成第三连接点，所述第三连接点接地。
在此种情况下，要求馈电点612至天线单元末端613的距离20～30mm，典型值23mm，目的是使得馈电点612的中频阻抗进入smith图的上半部分，切换电路连接点611可以与第一调谐电路630连接或者不连接，但要求等效于低频段开路特性。馈电点612至第三调谐电路660在天线单元610的连接点615的距离要求0～8mm，典型值3mm。第三电容663约0～3pf(典型值1.2pf)，第四电感662约12～100nH(典型值18nH)；第二电容642约0.5～2pf(典型值0.9pf)。即可产生低频和中频两个谐振模态，从而覆盖低频+中频CA所需的天线带宽。
如图17所示为天线阻抗的变化过程示意图，图18为回波损耗的变化过程示意图。如图17和图18所示，“C点”阻抗表示没有第二电容642、第四电感662和第三电容663的阻抗曲线，“并小电容和并大电感”表示有第四电感662和第三电容663，但没有第二电容642的阻抗曲线，“串小电容”表示有第二电容642、第四电感662和第三电容663的阻抗曲线。可见，实现了 低频和中频两个谐振模态。
若馈电点612至天线单元末端613的距离15～20mm，典型值15mm时，馈电点612的中频阻抗则可能仍处于smith图的下半部分，此时为了解决此种情况，进一步如图19所示，该天线电路，还包括：长度调节电感670；
其中，所述长度调节电感670的第一端与所述馈电点612连接，所述长度调节电感670的第二端与所述第二电容642的第一端连接。
通过串联“长度调节电感”，一般0～12nH，典型值6nH(也可以用等感值的传输线代替)，使得中频阻抗进入上半部分。
为了实现低频以及进行低频的调谐，如图20所示，本公开实施例的天线电路还包括：第四调谐电路680；所述第四调谐电路680的第一端与所述天线单元610连接，所述第四调谐电路680的第二端接地；其中，所述第四调谐电路680和所述第二电容642用于实现低频以及进行低频的调谐。
需要说明的是，在此种情况下，所述第一开关631的第二端与所述第一电感632的第二端、所述第二电感633的第二端、所述第一电容634的第二端和所述第一直通线635的第二端均不连接，且所述第二开关641的第二端与所述第二电容642的第二端连接。
具体地，所述第四调谐电路680包括：第四开关681、第五电感682、第六电感683、第四电容684；其中，所述第五电感682的第一端、所述第六电感683的第一端、所述第四电容684的第一端互相连接，形成第五连接点，所述第五连接点接地；所述第四开关681的第一端与所述天线单元610连接，所述第四开关681的第二端与所述第五电感682的第二端、所述第六电感683的第二端和所述第四电容684的第二端中的至少一者连接。
需要说明的是，为了实现低频，必须要有第二电容642，其电容值为0.5～2pf(典型值0.9pf)。为了使低频能覆盖更宽的带宽，第四调谐电路680内部可以有多个支路，切换不同支路以调谐低频。该第四开关681为单刀多掷开关，第五电感682是18nH，第六电感683是15nH，第四电容684是1.2pf电容。仅第四电容684导通工作于B12，仅第四电容684+第五电感682同时导通工作于B5+B1+B3的载波聚合状态，仅第六电感683导通工作于B8。
“低频+中频”载波聚合状态下(如B5+B1+B3，B12+B1+B3)，第四调 谐电路680对低频的调谐示意图如图21所示；低频非载波聚合状态下(如B12/B5/B8)，第四调谐电路680对低频的调谐示意图如图22所示。
需要说明的是，当所述天线电路中包括第三调谐电路时，所述第三调谐电路和所述第四调谐电路连接在所述天线单元的相同位置或不同位置；
其中，当所述第三调谐电路和所述第四调谐电路连接在所述天线单元的相同位置时，所述第三调谐电路和所述第四调谐电路合并，构成第一合并协调电路，所述第一合并协调电路包括：
第一合并开关、第一合并电感、第二合并电感和第一合并电容；所述第一合并电感的第一端、所述第二合并电感的第一端和所述第一合并电容的第一端互相连接，形成第一合并连接点，所述第一合并连接点接地；所述第一合并开关的第一端与所述天线单元连接，所述第一合并开关的第二端与所述第一合并电感的第二端、所述第二合并电感的第二端和所述第一合并电容的第二端中的至少一者连接；当所述第一合并开关的第二端与所述第一合并电容的第二端连接时，所述第一合并电容与所述第二电容用于产生低频段和中频段的两个谐振模态；第一合并电感和第二合并电感用于调谐低频段的谐振频率。
为了进一步增大中高频调谐范围，如图23所示，本公开实施例的天线电路，还包括：第五调谐电路690；其中，所述第五调谐电路690的第一端与所述天线单元610连接，所述第五调谐电路690的第二端接地；所述第五调谐电路690用于增大中高频调谐范围。
具体地，所述第五调谐电路690，包括：第五开关691、第七电感692和第五电容693；其中，所述第七电感692的第一端与所述第五电容693的第一端连接，形成第六连接点，所述第六连接点接地；所述第五开关691的第一端与所述天线单元610连接，所述第五开关691的第二端与所述第七电感692的第二端和所述第五电容693的第二端中的至少一者连接。
在此种情况下，在所述第一开关631的第二端与所述第一电感632的第二端、所述第二电感633的第二端、所述第一电容634的第二端和所述第一直通线635的第二端中的至少一者连接，且所述第二开关641的第二端与所述第二直通线643连接。
该第五调谐电路690在具体实现时，可以是利用在第三调谐电路660实现。
还需要说明的是，当所述天线电路中包括第三电感时，所述第三电感和所述第五调谐电路连接在所述天线单元的相同位置或不同位置；其中，当所述第三电感和所述第五调谐电路连接在所述天线单元的相同位置时，所述第三电感和所述第五调谐电路合并，构成第二合并协调电路，所述第二合并协调电路包括：第二合并开关、第三合并电感、第四合并电感和第二合并电容；所述第三合并电感的第一端、所述第四合并电感的第一端和所述第二合并电容的第一端互相连接，形成第二合并连接点，所述第二合并连接点接地；所述第二合并开关的第一端与所述天线单元连接，所述第二合并开关的第二端与所述第三合并电感的第二端、所述第四合并电感的第二端和所述第二合并电容的第二端中的至少一者连接。
如图24所示，切换电路连接点611连接8.2pf电容，第五调谐电路690设置成连接电感值为3.9nH的电感，可使得高频谐振模态往频率更高的方向移动。反之，若设置成并电容时，则往频率更低的方向移动。
需要说明的是，本公开中所描述的天线电路所实现的每个功能，可以组合起来使用，共同实现天线的功能。
如图25所示，为低频+中频CA的自由空间的天线效率，图25中“1-FS-B12+B3+B1”表示B12+B3+B1的CA状态的天线效率，此时第三调谐电路660内部设为1.2pf、第二调谐电路640设为0.9pf、第一调谐电路630设为开路；“3-FS-B5+B3+B1”表示B5+B3+B1的CA状态的天线效率，此时第三调谐电路660设为1.2pf+18nH的并联电路、第二调谐电路640设为0.9pf、第一调谐电路630设为开路。另外，也可以实现B8+B3+B1，此时只需将第三调谐电路660设为1.2pf+15nH的并联电路、第二调谐电路640设为0.9pf、第一调谐电路630设为开路、长度调节电感等于3nH。
如图26所示，为调整长度调节电感的作用。可有效的调节中频的谐振频率，下图中“原始”表示B5+B1+B3的CA状态时，没有长度调节电感的天线效率，“加大长度调节电感”表示B5+B1+B3的CA状态时，长度调节电感等于6nH的天线效率。
如图27所示，是B1和B3的非CA和CA状态的自由空间的天线效率差异。“5-FS-B1”和“6-FS-B3”和“7-FS-B1+B3”分别表示非CA状态的B1、非CA状态的B3、CA状态的B1+B3的天线效率，此时第三调谐电路660设为6.8nH、第二调谐电路640设为直通、第一调谐电路630分别设为6.8nH(对应B3)，4.7nH(对应B1+B3)，3.9nH(对应B1)。
如图28所示，是B39和B41的非CA和CA状态的自由空间的天线效率差异。“7-FS-B39”和“9-FS-B41”和“10-FS-B39+B41”分别表示非CA状态的B39、非CA状态的B41、CA状态的B39+B41的天线效率。可见，非CA的B39效率高于CA状态的B39约1～2dB，且非CA的B41效率高于CA状态的B41约1～2dB。B39+41的CA时，第三调谐电路660设为6.8nH、第二调谐电路640设为0.9pf、第一调谐电路630分别设为6.8nH；非CA时，第三调谐电路660设为6.8nH、第二调谐电路640设为直通、第一调谐电路630分别设为6.8nH(对应B39)、8.2pf(对应B41)、长度调节电感等于3nH。
如图29所示，是非CA状态的B8/B1/B3/B40/B41的自由空间的天线效率图。“2-FS-B8”、“5-FS-B1”、“6-FS-B3”、“8-FS-B40”、“9-FS-B41”分别表示非CA的B8、B1、B3、B40、B41的天线效率。B8时第三调谐电路660设为15nH、第二调谐电路640设为0.9pf、第一调谐电路630设为开路，长度调节电感等于3nH。B1/B3/B40/B41时，第三调谐电路660设为6.8nH、第二调谐电路640设为直通、第一调谐电路630分别设为6.8nH(对应B3)、3.9nH(对应B1)、0欧(对应B40)、8.2pf(对应B41)，长度调节电感等于3nH。
本公开上述方案，可有效的改善中频和高频的单个谐振模态的带宽，拓展中频和高频的带宽，同时还实现低频以及拓展了低频的带宽，从总体上提高了天线的性能。
本公开一实施例还提供一种移动终端，包括上述的天线电路。
需要说明的是，设置有该天线电路的移动终端，提高了移动终端的通信性能，提高了用户的使用体验。
图30是本公开实施例的移动终端的结构示意图。具体地，图30中的移动终端可以为手机、平板电脑、个人数字助理(Personal Digital Assistant，PDA)、或车载电脑等。
图30中的移动终端包括射频(Radio Frequency，RF)电路3010、存储器3020、输入单元3030、显示单元3040、处理器3050、音频电路3060、WiFi(Wireless Fidelity)模块3070和电源3080。
其中，输入单元3030可用于接收用户输入的数字或字符信息，以及产生与移动终端的用户设置以及功能控制有关的信号输入。具体地，本公开实施例中，该输入单元3030可以包括触控面板3031。触控面板3031，也称为触摸屏，可收集用户在其上或附近的触摸操作(比如用户使用手指、触笔等任何适合的物体或附件在触控面板3031上的操作)，并根据预先设定的程式驱动相应的连接装置。在一些可选的实施例中，触控面板3031可包括触摸检测装置和触摸控制器两个部分。其中，触摸检测装置检测用户的触摸方位，并检测触摸操作带来的信号，将信号传送给触摸控制器；触摸控制器从触摸检测装置上接收触摸信息，并将它转换成触点坐标，再送给该处理器3050，并能接收处理器3050发来的命令并加以执行。此外，可以采用电阻式、电容式、红外线以及表面声波等多种类型实现触控面板3031。除了触控面板3031，输入单元3030还可以包括其他输入设备3032，其他输入设备3032可以包括但不限于物理键盘、功能键(比如音量控制按键、开关按键等)、轨迹球、鼠标、操作杆等中的一种或多种。
其中，显示单元3040可用于显示由用户输入的信息或提供给用户的信息以及移动终端的各种菜单界面。显示单元3040可包括显示面板3041，在一些可选的实施例中，可以采用LCD或有机发光二极管(Organic Light-Emitting Diode，OLED)等形式来配置显示面板3041。
应注意，触控面板3031可以覆盖显示面板3041，形成触摸显示屏，当该触摸显示屏检测到在其上或附近的触摸操作后，传送给处理器3050以确定触摸事件的类型，随后处理器3050根据触摸事件的类型在触摸显示屏上提供相应的视觉输出。
触摸显示屏包括应用程序界面显示区及常用控件显示区。该应用程序界面显示区及该常用控件显示区的排列方式并不限定，可以为上下排列、左右排列等可以区分两个显示区的排列方式。该应用程序界面显示区可以用于显示应用程序的界面。每一个界面可以包含至少一个应用程序的图标和/或 widget桌面控件等界面元素。该应用程序界面显示区也可以为不包含任何内容的空界面。该常用控件显示区用于显示使用率较高的控件，例如，设置按钮、界面编号、滚动条、电话本图标等应用程序图标等。
其中处理器3050是移动终端的控制中心，利用各种接口和线路连接整个手机的各个部分，通过运行或执行存储在第一存储器3021内的软件程序和/或模块，以及调用存储在第二存储器3022内的数据，执行移动终端的各种功能和处理数据，从而对移动终端进行整体监控。在一些可选的实施例中，处理器3050可包括一个或多个处理单元。
需要说明的是，射频(Radio Frequency，RF)电路3010包括：天线单元；所述天线单元上设置有切换电路连接点和馈电点；所述馈电点上连接有天线馈源；所述切换电路连接点连接有第一调谐电路，所述第一调谐电路用于增大中高频的单个谐振模态带宽和/或调谐中高频的谐振频率；其中，所述馈电点至天线单元末端的距离大于所述切换电路连接点至所述天线单元末端的距离。
具体地，所述第一调谐电路，包括：第一开关、第一电感、第二电感、第一电容和第一直通线；其中，所述第一电感的第一端、所述第二电感的第一端、所述第一电容的第一端、所述第一直通线的第一端互相连接，形成第一连接点，所述第一连接点接地；所述第一开关的第一端与所述切换电路连接点连接，所述第一开关的第二端与所述第一电感的第二端、所述第二电感的第二端、所述第一电容的第二端和所述第一直通线的第二端中的至少一者连接；或者所述第一开关的第二端与所述第一电感的第二端、所述第二电感的第二端、所述第一电容的第二端和所述第一直通线的第二端均不连接；当所述第一开关的第二端与所述第一电感的第二端、所述第二电感的第二端、所述第一电容的第二端和所述第一直通线的第二端中的至少一者连接时，用于增大中高频单个谐振模态的带宽；当所述第一开关的第二端与所述第一电感的第二端、所述第二电感的第二端、所述第一电容的第二端和所述第一直通线的第二端中的不同的一者或不同的多者连接时，用于调谐中高频的谐振频率。
在一些可选的实施例中，所述射频(Radio Frequency，RF)电路3010， 还包括：第二调谐电路，所述第二调谐电路的第一端与所述馈电点连接，所述第二调谐电路的第二端与所述天线馈源连接；其中，当所述第一开关的第二端与所述第一电感的第二端、所述第二电感的第二端、所述第一电容的第二端和所述第一直通线的第二端中的至少一者连接时，所述第二调谐电路用于调谐非载波聚合状态下和载波聚合状态下的中频和/或高频的带宽。
具体地，所述第二调谐电路包括：第二开关、第二电容和第二直通线；所述第二电容的第一端与所述第二直通线的第一端连接，形成第二连接点，所述第二连接点与所述天线馈源连接；所述第二开关的第一端与所述馈电点连接，所述第二开关的第二端与所述第二电容的第二端或所述第二直通线的第二端连接；其中，当所述第一开关的第二端与所述第一电感的第二端、所述第二电感的第二端、所述第一电容的第二端和所述第一直通线的第二端中的至少一者连接，且所述第二开关的第二端与所述第二直通线的第二端连接时，所述天线电路工作于非载波聚合状态。
具体地，当所述第一开关的第二端与所述第一电感的第二端、所述第二电感的第二端、所述第一电容的第二端和所述第一直通线的第二端均不连接，且所述第二开关的第二端与所述第二电容的第二端连接时，产生低频段的谐振模态。
在一些可选的实施例中，在所述第一开关的第二端与所述第一电感的第二端、所述第二电感的第二端、所述第一电容的第二端和所述第一直通线的第二端中的至少一者连接时，所述射频(Radio Frequency，RF)电路3010，还包括：第三电感；其中，所述第三电感的第一端与所述天线单元连接，所述第三电感的第二端接地；所述第二开关的第二端与所述第二电容的第二端连接，所述天线电路工作于载波聚合状态，所述第三电感和所述第二电容用于：将单个谐振模态变为两个谐振模态。
在一些可选的实施例中，所述射频(Radio Frequency，RF)电路3010，还包括：第三调谐电路；所述第三调谐电路的第一端与所述天线单元连接，或者所述第三调谐电路的第一端与所述第二电容的第一端连接；所述第三调谐电路的第二端接地；其中，所述第三调谐电路和所述第二电容用于产生低频段和中频段的两个谐振模态。
具体地，所述第三调谐电路，包括：第三开关、第四电感和第三电容；其中，所述第三开关的第一端与所述天线单元连接，或者所述第三开关的第一端与所述第二电容的第一端连接；所述第三开关的第二端与所述第四电感的第一端和所述第三电容的第一端中的至少一者连接；所述第四电感的第二端和所述第三电容的第二端连接，形成第三连接点，所述第三连接点接地。
在一些可选的实施例中，所述射频(Radio Frequency，RF)电路3010，还包括：长度调节电感；其中，所述长度调节电感的第一端与所述馈电点连接，所述长度调节电感的第二端与所述第二电容的第一端连接。
在一些可选的实施例中，所述射频(Radio Frequency，RF)电路3010，还包括：第四调谐电路；所述第四调谐电路的第一端与所述天线单元连接，所述第四调谐电路的第二端接地；其中，所述第四调谐电路和所述第二电容用于实现低频以及进行低频的调谐。
具体地，所述第四调谐电路包括：第四开关、第五电感、第六电感、第四电容；其中，所述第五电感的第一端、所述第六电感的第一端、所述第四电容的第一端互相连接，形成第五连接点，所述第五连接点接地；
所述第四开关的第一端与所述天线单元连接，所述第四开关的第二端与所述第五电感的第二端、所述第六电感的第二端和所述第四电容的第二端中的至少一者连接。
在一些可选的实施例中，当所述天线电路中包括第三调谐电路时，所述第三调谐电路和所述第四调谐电路连接在所述天线单元的相同位置或不同位置；其中，当所述第三调谐电路和所述第四调谐电路连接在所述天线单元的相同位置时，所述第三调谐电路和所述第四调谐电路合并，构成第一合并协调电路，所述第一合并协调电路包括：第一合并开关、第一合并电感、第二合并电感和第一合并电容；所述第一合并电感的第一端、所述第二合并电感的第一端和所述第一合并电容的第一端互相连接，形成第一合并连接点，所述第一合并连接点接地；所述第一合并开关的第一端与所述天线单元连接，所述第一合并开关的第二端与所述第一合并电感的第二端、所述第二合并电感的第二端和所述第一合并电容的第二端中的至少一者连接；当所述第一合并开关的第二端与所述第一合并电容的第二端连接时，所述第一合并电容与 所述第二电容用于产生低频段和中频段的两个谐振模态；第一合并电感和第二合并电感用于调谐低频段的谐振频率。
在一些可选的实施例中，在所述第一开关的第二端与所述第一电感的第二端、所述第二电感的第二端、所述第一电容的第二端和所述第一直通线的第二端中的至少一者连接时所述射频(Radio Frequency，RF)电路3010，还包括：第五调谐电路；其中，所述第五调谐电路的第一端与所述天线单元连接，所述第五调谐电路的第二端接地；所述第五调谐电路用于增大中高频调谐范围。
具体地，所述第五调谐电路，包括：第五开关、第七电感和第五电容；其中，所述第七电感的第一端与所述第五电容的第一端连接，形成第六连接点，所述第六连接点接地；所述第五开关的第一端与所述天线单元连接，所述第五开关的第二端与所述第七电感的第二端和所述第五电容的第二端中的至少一者连接。
在一些可选的实施例中，当所述天线电路中包括第三电感时，所述第三电感和所述第五调谐电路连接在所述天线单元的相同位置或不同位置；其中，当所述第三电感和所述第五调谐电路连接在所述天线单元的相同位置时，所述第三电感和所述第五调谐电路合并，构成第二合并协调电路，所述第二合并协调电路包括：第二合并开关、第三合并电感、第四合并电感和第二合并电容；所述第三合并电感的第一端、所述第四合并电感的第一端和所述第二合并电容的第一端互相连接，形成第二合并连接点，所述第二合并连接点接地；所述第二合并开关的第一端与所述天线单元连接，所述第二合并开关的第二端与所述第三合并电感的第二端、所述第四合并电感的第二端和所述第二合并电容的第二端中的至少一者连接。
具体地，所述馈电点到所述天线单元末端的距离为15毫米至30毫米，所述切换电路连接点至所述天线单元末端的距离为5毫米至18毫米。
本公开实施例的移动终端，通过将天线单元的切换电路连接点和馈电点交换位置，将馈电点设置的更靠近天线单元接地端的方向移动，以此解决了天线的中频或高频的带宽不足的问题，此种方式，拓展中频和高频的带宽，同时还实现低频以及拓展了低频的带宽，从总体上提高了天线的性能，进而 提高了移动终端的通信性能，提高了用户的使用体验。
本说明书中的各个实施例均采用递进的方式描述，每个实施例重点说明的都是与其他实施例的不同之处，各个实施例之间相同相似的部分互相参见即可。
本领域内的技术人员应明白，本公开实施例的实施例可提供为方法、装置、或计算机程序产品。因此，本公开实施例可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且，本公开实施例可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器、CD-ROM、光学存储器等)上实施的计算机程序产品的形式。
本公开实施例是参照根据本公开实施例的方法、终端设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理终端设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理终端设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理终端设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理终端设备上，使得在计算机或其他可编程终端设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程终端设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
尽管已描述了本公开实施例的优选实施例，但本领域内的技术人员一旦得知了基本创造性概念，则可对这些实施例做出另外的变更和修改。所以， 所附权利要求意欲解释为包括优选实施例以及落入本公开实施例范围的所有变更和修改。
还需要说明的是，在本文中，诸如第一和第二等之类的关系术语仅仅用来将一个实体或者操作与另一个实体或操作区分开来，而不一定要求或者暗示这些实体或操作之间存在任何这种实际的关系或者顺序。而且，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、物品或者终端设备不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、物品或者终端设备所固有的要素。在没有更多限制的情况下，由语句“包括一个……”限定的要素，并不排除在包括所述要素的过程、方法、物品或者终端设备中还存在另外的相同要素。
以上所述的是本公开的优选实施方式，应当指出对于本技术领域的普通人员来说，在不脱离本公开所述的原理前提下还可以作出若干改进和润饰，这些改进和润饰也在本公开的保护范围内。

Claims (18)

  1. 一种天线电路，包括：
    天线单元；
    所述天线单元上设置有切换电路连接点和馈电点；
    所述馈电点上连接有天线馈源；
    所述切换电路连接点连接有第一调谐电路，所述第一调谐电路用于增大中高频的单个谐振模态带宽和/或调谐中高频的谐振频率；
    其中，所述馈电点至天线单元末端的距离大于所述切换电路连接点至所述天线单元末端的距离。
  2. 根据权利要求1所述的天线电路，其中，所述第一调谐电路，包括：
    第一开关、第一电感、第二电感、第一电容和第一直通线；
    其中，所述第一电感的第一端、所述第二电感的第一端、所述第一电容的第一端、所述第一直通线的第一端互相连接，形成第一连接点，所述第一连接点接地；
    所述第一开关的第一端与所述切换电路连接点连接，所述第一开关的第二端与所述第一电感的第二端、所述第二电感的第二端、所述第一电容的第二端和所述第一直通线的第二端中的至少一者连接；或者所述第一开关的第二端与所述第一电感的第二端、所述第二电感的第二端、所述第一电容的第二端和所述第一直通线的第二端均不连接；
    当所述第一开关的第二端与所述第一电感的第二端、所述第二电感的第二端、所述第一电容的第二端和所述第一直通线的第二端中的至少一者连接时，用于增大中高频单个谐振模态的带宽；
    当所述第一开关的第二端与所述第一电感的第二端、所述第二电感的第二端、所述第一电容的第二端和所述第一直通线的第二端中的不同的一者或不同的多者连接时，用于调谐中高频的谐振频率。
  3. 根据权利要求2所述的天线电路，还包括：
    第二调谐电路，所述第二调谐电路的第一端与所述馈电点连接，所述第二调谐电路的第二端与所述天线馈源连接；
    其中，当所述第一开关的第二端与所述第一电感的第二端、所述第二电感的第二端、所述第一电容的第二端和所述第一直通线的第二端中的至少一者连接时，所述第二调谐电路用于调谐非载波聚合状态下和载波聚合状态下的中频和/或高频的带宽。
  4. 根据权利要求3所述的天线电路，其中，所述第二调谐电路包括：
    第二开关、第二电容和第二直通线；
    所述第二电容的第一端与所述第二直通线的第一端连接，形成第二连接点，所述第二连接点与所述天线馈源连接；
    所述第二开关的第一端与所述馈电点连接，所述第二开关的第二端与所述第二电容的第二端或所述第二直通线的第二端连接；
    其中，当所述第一开关的第二端与所述第一电感的第二端、所述第二电感的第二端、所述第一电容的第二端和所述第一直通线的第二端中的至少一者连接，且所述第二开关的第二端与所述第二直通线的第二端连接时，所述天线电路工作于非载波聚合状态。
  5. 根据权利要求4所述的天线电路，其中，当所述第一开关的第二端与所述第一电感的第二端、所述第二电感的第二端、所述第一电容的第二端和所述第一直通线的第二端均不连接，且所述第二开关的第二端与所述第二电容的第二端连接时，产生低频段的谐振模态。
  6. 根据权利要求4所述的天线电路，其中，在所述第一开关的第二端与所述第一电感的第二端、所述第二电感的第二端、所述第一电容的第二端和所述第一直通线的第二端中的至少一者连接时，所述天线电路，还包括：
    第三电感；
    其中，所述第三电感的第一端与所述天线单元连接，所述第三电感的第二端接地；
    所述第二开关的第二端与所述第二电容的第二端连接，所述天线电路工作于载波聚合状态，所述第三电感和所述第二电容用于：将单个谐振模态变为两个谐振模态。
  7. 根据权利要求5所述的天线电路，还包括：
    第三调谐电路；
    所述第三调谐电路的第一端与所述天线单元连接，或者所述第三调谐电路的第一端与所述第二电容的第一端连接；所述第三调谐电路的第二端接地；
    其中，所述第三调谐电路和所述第二电容用于产生低频段和中频段的两个谐振模态。
  8. 根据权利要求7所述的天线电路，其中，所述第三调谐电路，包括：
    第三开关、第四电感和第三电容；
    其中，所述第三开关的第一端与所述天线单元连接，或者所述第三开关的第一端与所述第二电容的第一端连接；
    所述第三开关的第二端与所述第四电感的第一端和所述第三电容的第一端中的至少一者连接；
    所述第四电感的第二端和所述第三电容的第二端连接，形成第三连接点，所述第三连接点接地。
  9. 根据权利要求7所述的天线电路，还包括：
    长度调节电感；
    其中，所述长度调节电感的第一端与所述馈电点连接，所述长度调节电感的第二端与所述第二电容的第一端连接。
  10. 根据权利要求5或7所述的天线电路，还包括：
    第四调谐电路；
    所述第四调谐电路的第一端与所述天线单元连接，所述第四调谐电路的第二端接地；
    其中，所述第四调谐电路和所述第二电容用于实现低频以及进行低频的调谐。
  11. 根据权利要求10所述的天线电路，其中，所述第四调谐电路包括：
    第四开关、第五电感、第六电感、第四电容；
    其中，所述第五电感的第一端、所述第六电感的第一端、所述第四电容的第一端互相连接，形成第五连接点，所述第五连接点接地；
    所述第四开关的第一端与所述天线单元连接，所述第四开关的第二端与所述第五电感的第二端、所述第六电感的第二端和所述第四电容的第二端中的至少一者连接。
  12. 根据权利要求10所述的天线电路，其中，当所述天线电路中包括第三调谐电路时，所述第三调谐电路和所述第四调谐电路连接在所述天线单元的相同位置或不同位置；
    其中，当所述第三调谐电路和所述第四调谐电路连接在所述天线单元的相同位置时，所述第三调谐电路和所述第四调谐电路合并，构成第一合并协调电路，所述第一合并协调电路包括：
    第一合并开关、第一合并电感、第二合并电感和第一合并电容；
    所述第一合并电感的第一端、所述第二合并电感的第一端和所述第一合并电容的第一端互相连接，形成第一合并连接点，所述第一合并连接点接地；
    所述第一合并开关的第一端与所述天线单元连接，所述第一合并开关的第二端与所述第一合并电感的第二端、所述第二合并电感的第二端和所述第一合并电容的第二端中的至少一者连接；
    当所述第一合并开关的第二端与所述第一合并电容的第二端连接时，所述第一合并电容与所述第二电容用于产生低频段和中频段的两个谐振模态；第一合并电感和第二合并电感用于调谐低频段的谐振频率。
  13. 根据权利要求4或6所述的天线电路，其中，在所述第一开关的第二端与所述第一电感的第二端、所述第二电感的第二端、所述第一电容的第二端和所述第一直通线的第二端中的至少一者连接时，所述天线电路，还包括：
    第五调谐电路；
    其中，所述第五调谐电路的第一端与所述天线单元连接，所述第五调谐电路的第二端接地；
    所述第五调谐电路用于增大中高频调谐范围。
  14. 根据权利要求13所述的天线电路，其中，所述第五调谐电路，包括：
    第五开关、第七电感和第五电容；
    其中，所述第七电感的第一端与所述第五电容的第一端连接，形成第六连接点，所述第六连接点接地；
    所述第五开关的第一端与所述天线单元连接，所述第五开关的第二端与所述第七电感的第二端和所述第五电容的第二端中的至少一者连接。
  15. 根据权利要求13所述的天线电路，其中，当所述天线电路中包括第三电感时，所述第三电感和所述第五调谐电路连接在所述天线单元的相同位置或不同位置；
    其中，当所述第三电感和所述第五调谐电路连接在所述天线单元的相同位置时，所述第三电感和所述第五调谐电路合并，构成第二合并协调电路，所述第二合并协调电路包括：
    第二合并开关、第三合并电感、第四合并电感和第二合并电容；
    所述第三合并电感的第一端、所述第四合并电感的第一端和所述第二合并电容的第一端互相连接，形成第二合并连接点，所述第二合并连接点接地；
    所述第二合并开关的第一端与所述天线单元连接，所述第二合并开关的第二端与所述第三合并电感的第二端、所述第四合并电感的第二端和所述第二合并电容的第二端中的至少一者连接。
  16. 根据权利要求1所述的天线电路，其中，所述馈电点到所述天线单元末端的距离为15毫米至30毫米，所述切换电路连接点至所述天线单元末端的距离为5毫米至18毫米。
  17. 一种移动终端，包括如权利要求1至16中任一项所述的天线电路。
  18. 根据权利要求17所述的移动终端，其中，所述移动终端包括手机、平板电脑、个人数字助理和车载电脑中的至少一项。
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CN107331979A (zh) 2017-11-07
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