WO2018171057A1 - 一种移动终端的天线及移动终端 - Google Patents

一种移动终端的天线及移动终端 Download PDF

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Publication number
WO2018171057A1
WO2018171057A1 PCT/CN2017/088683 CN2017088683W WO2018171057A1 WO 2018171057 A1 WO2018171057 A1 WO 2018171057A1 CN 2017088683 W CN2017088683 W CN 2017088683W WO 2018171057 A1 WO2018171057 A1 WO 2018171057A1
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WIPO (PCT)
Prior art keywords
conductor
metal
metal segment
antenna
point
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/CN2017/088683
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English (en)
French (fr)
Inventor
应李俊
王汉阳
薛亮
尤佳庆
李建铭
杨小丽
余冬
王磊
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 Technologies Co Ltd
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Huawei Technologies 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 Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to US16/495,806 priority Critical patent/US11069955B2/en
Priority to EP17902339.5A priority patent/EP3591759B1/en
Priority to CN201780011892.7A priority patent/CN108713277B/zh
Priority to KR1020197027683A priority patent/KR102208890B1/ko
Priority to BR112019019396-0A priority patent/BR112019019396B1/pt
Priority to AU2017405558A priority patent/AU2017405558B2/en
Priority to JP2019551548A priority patent/JP6945645B2/ja
Publication of WO2018171057A1 publication Critical patent/WO2018171057A1/zh
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
    • 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
    • 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
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/2258—Supports; Mounting means by structural association with other equipment or articles used with computer equipment
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/44—Details of, or arrangements associated with, antennas using equipment having another main function to serve additionally as an antenna, e.g. means for giving an antenna an aesthetic aspect
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/48—Earthing means; Earth screens; Counterpoises
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
    • H01Q5/342—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes
    • H01Q5/357—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes using a single feed point
    • H01Q5/364—Creating multiple current paths
    • H01Q5/371—Branching current paths
    • 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
    • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
    • H01Q9/045—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with particular feeding means

Definitions

  • the present application relates to the field of communications technologies, and in particular, to an antenna and a mobile terminal of a mobile terminal.
  • the T-shaped antenna uses a metal frame as a radiating element of the antenna, and at least two slits are formed in the metal frame, and the slit divides the metal frame into three metal segments, respectively labeled as the first metal segment. 1.
  • the current of the T-type antenna is distributed on the metal frame of the mobile terminal, and reference is made to FIG. 2a to FIG. 2d together, wherein FIG.
  • FIG. 2a is a schematic diagram of the maximum electric field distribution of the feed to the quarter-wave mode of the left slit long branch.
  • Figure 2b is a schematic diagram showing the distribution of the electric field maximum value in the one-wavelength mode of the second metal segment 2
  • Figure 2c is a schematic diagram showing the maximum electric field distribution in the quarter mode of the short-segment of the right slit.
  • 2d is a schematic diagram of the maximum distribution of the three-quarter-wavelength modal electric field fed to the left slit long branch, where the circle represents the maximum electric field point of the corresponding mode. It can be seen from Fig. 2a to Fig.
  • the maximum point of each modal electric field is generally at the gap of the metal frame, so that the antenna is loaded more, the radiation aperture is small, and the bandwidth and radiation efficiency are poor, and the large screen has a small clearance. This is especially the case.
  • the position of the antenna slot is set close to the edge of the metal frame. As a result, the large electric field area is closer to the hand, and the antenna is greatly affected by the hand.
  • the embodiment of the present application provides an antenna and a mobile terminal of a mobile terminal, which are used to improve performance of an antenna of the mobile terminal.
  • an antenna of a mobile terminal has a metal frame, and the metal frame is provided with at least two slits, and the two slits divide the metal frame into a first metal segment and a second a metal segment and a third metal segment, the antenna comprising a radiating element, a matching network, a feeding point, and a grounding point, wherein
  • the radiating unit includes a second metal segment between the two slits, a first conductor, and a second conductor, and the first conductor is connected to one end of the second metal segment, and the first a connection point of the conductor and the second metal segment is a feeding contact point; the second conductor is connected to the other end of the second metal segment, and a connection point of the second conductor and the second metal segment a ground contact point; a vertical distance between the feed point and the ground point is less than a vertical distance between the feed contact point and the ground contact point;
  • the feed point is connected to the first conductor through the matching network
  • the grounding point is connected to the second conductor
  • the electrical length path of the current from the feed point to the second metal segment is not equal to the electrical length path of the current from the ground point to the second metal segment.
  • the current is at the feeding point
  • the electrical length path of the second metal segment is not equal to the electrical length path from the grounding point to the second metal segment, so that the maximum point of each modal electric field is away from the gap of the metal frame, thereby reducing the gap.
  • the electric field is loaded and the influence of the hand on the modal electric field is reduced, thereby improving the performance of the antenna.
  • the feed point is coupled to the first conductor via a matching network.
  • the matching network can be composed of an electronically controlled switch, a variable capacitor, a capacitor, and an inductor, and connected in parallel or in series.
  • the feeding point may be located on both sides of the center line respectively with the grounding point, or the feeding point and the grounding point may be located on one side of the center line, and the center line is the second line.
  • the center line of the metal segment is perpendicular to the center line of the length direction of the second metal segment.
  • the adjustment circuit comprising: a plurality of parallel branches, each branch being provided with an inductor or a capacitor, each The branches are grounded; the second metal segment is selectively connectable to one of the regulating circuits.
  • the effective electrical length of the antenna can be changed by setting an adjustment circuit to achieve the purpose of tuning the resonant frequency of the antenna. In the specific setting, one switch is set on each branch, or a single-pole multi-throw switch is used to realize the connection with one branch.
  • At least one of the branches is provided with a series of inductors and capacitors.
  • the effective electrical length of the antenna can be changed by changing the capacitance or inductance value described above to achieve the purpose of tuning the resonant frequency of the antenna.
  • the second conductor is provided with an adjustment circuit
  • the adjustment circuit includes a plurality of parallel branches, each branch is provided with an inductor, and each branch is connected to the ground point;
  • the second metal segment is selectively connectable to one of the regulating circuits.
  • the effective electrical length of the antenna can be changed by setting an adjustment circuit to achieve the purpose of tuning the resonant frequency of the antenna. In the specific setting, one switch is set on each branch, or a single-pole multi-throw switch is used to realize the connection with one branch.
  • At least one of the branches is provided with a series of inductors and capacitors.
  • the effective electrical length of the antenna can be varied by varying the capacitance or inductance value to achieve the purpose of tuning the antenna resonant frequency.
  • the antenna further includes one or two parasitic elements, which may be formed by the first metal segment or the third metal segment being grounded.
  • the resonant frequency of the parasitic unit can be adjusted by a ground point.
  • the parasitic unit is a first metal segment, a third metal segment, or a first metal segment and a metal patch disposed at a slit end of the first metal segment, or a third metal segment And a metal patch disposed at an end of the slit of the third metal segment.
  • the metal patch is a flexible circuit board, a metal conductive sheet, a laser layer, or a thin layer conductor.
  • the first conductor and the second conductor are connected by a third conductor other than the second metal segment, the third conductor being a flexible circuit board, a metal conductive sheet, a laser layer or a thin layer Layer conductor.
  • a mobile terminal in a second aspect, includes a metal frame, and at least two slits are formed in the metal frame, and the two slits divide the metal frame into first metal segments insulated from each other, The second metal segment and the third metal segment further include the antenna of any of the above.
  • the electrical length path of the current from the feeding point to the second metal segment and the grounding point to the second metal segment are changed by changing the lengths of the first conductor and the second conductor
  • the electrical length paths are not equal, so that the maximum point of each modal electric field is away from the gap of the metal frame, thereby reducing the electric field loading of the gap and reducing the influence of the hand on the modal electric field, thereby improving the performance of the antenna.
  • 1 is a structure of an antenna of a mobile terminal in the prior art
  • FIG. 2a to 2d are schematic diagrams showing the distribution of the maximum value of the modal electric field of the antenna shown in FIG. 1 in different frequency bands;
  • FIG. 3 is a schematic structural diagram of an antenna according to an embodiment of the present disclosure.
  • FIG. 4 is a schematic structural diagram of an antenna parallel resonant ESC according to an embodiment of the present disclosure
  • FIG. 5 is a schematic structural diagram of an antenna series resonant electrical tone according to an embodiment of the present disclosure
  • FIG. 6 is a schematic structural diagram of another antenna according to an embodiment of the present disclosure.
  • FIG. 7 is a schematic structural diagram of another antenna according to an embodiment of the present disclosure.
  • FIGS. 8a-8d are schematic diagrams showing the distribution of the maximum value of the modal electric field of the antenna shown in Fig. 6 in different frequency bands.
  • the antenna provided in this embodiment is applied to a mobile terminal, and the mobile terminal may be a common mobile terminal device such as a mobile phone or a tablet computer, and the mobile terminal device has a metal frame, and at least two slits are formed on the metal frame.
  • the metal frame is divided into a plurality of mutually insulated metal segments. In this embodiment, as shown in FIG. 3, two slits are formed in the metal frame, and the two slits divide the metal frame into: a first metal segment 50, The second metal segment 22 and the third metal segment 60.
  • the antenna provided in this embodiment includes a radiating unit 20, a matching network 40, a feeding point 10, and a grounding point 30.
  • One end of the radiating element 20 is connected to the feeding point 10 through a matching network, and the other end is connected to the grounding point 30.
  • the antenna includes a radiating unit 20, a matching network 40, a feeding point 10, and a grounding point 30.
  • One end of the radiating element 20 is connected to the feeding point 10 through a matching network, and the other end is connected to the grounding point 30.
  • the radiating element 20 includes three parts: a second metal segment 22, a first conductor 21 and a second conductor 23, respectively; when connected, the first conductor 21 and the second conductor 23 Connected to the two ends of the second metal segment 22, that is, the first conductor 21 is connected to one end of the second metal segment 22, and the second conductor 23 is connected to the other end of the second metal segment 22, wherein the second metal segment 22 is
  • the second metal segment 22 indicated by the end is adjacent to the end of the slit, the end being a metal segment having a length of one end (e.g., less than 5 mm), and the first conductor 21 and the second conductor 23 may be connected to any position on the metal segment.
  • connection point of the first conductor 21 and the second metal segment 22 is the feed contact point 80, and the connection point of the second conductor 23 and the second metal segment 22 is the ground contact point 90; with reference to FIG. 3, it can be seen from FIG.
  • the vertical distance d between the feeding point 10 and the grounding point 30 is smaller than the vertical distance D between the feeding contact point 80 and the grounding contact point 90; more specifically, the vertical distance d between the feeding point 10 and the grounding point 30 is much smaller than the feeding
  • the vertical distance D between the contact point 80 and the ground contact point 90 such as the ratio of d to D, is between 1/5 and 1/2. It should be understood that the ratio is merely to illustrate that there is a large difference in the distance between the two, and there is no direct correspondence.
  • the formed antenna can be applied to different frequency bands, and the performance of the antenna is better improved.
  • the feeding point 10 and the grounding point 30 are located on the same side of the second metal segment 22, and the first conductor 21, the second conductor 23 and the second metal segment 22 enclose an annular shape having an opening, thereby Form a loop antenna.
  • the electrical length path of the feeding point 10 and the grounding point 30 to the second metal segment 22 (the length of the path through which the electric charge flows from one point to another) is different, that is, the current is at the feeding point 10
  • the electrical length path of the second metal segment 22 is not equal to the electrical length path of the ground point 30 to the second metal segment 22.
  • FIGS. 2a to 2d are schematic diagrams showing the maximum electric field distribution of a conventional T antenna.
  • Figure 2a is the long branch quarter Schematic diagram of the maximum electric field distribution in one wavelength mode
  • FIG. 2b is a schematic diagram of the maximum electric field distribution in the one-wavelength mode of the lump
  • FIG. 2c is a schematic diagram of the maximum electric field distribution in the quarter mode of the short branch
  • 2d is a schematic diagram showing the maximum distribution of the three-quarter-wavelength mode electric field of the long branch; as can be seen from FIG. 2a, FIG. 2b, FIG. 2c and FIG. 2d, when the T-type antenna of the prior art adopts this mode, the electric field is maximum.
  • the value is located at the position of the gap, causing the large electric field to be closer to the hand, and the antenna is greatly affected by the hand, which affects the performance of the antenna.
  • the electrical length path fed to the second metal segment 22 can be changed by changing the length of the first conductor 21 such that the electrical length path of the feed point 10 to the second metal segment 22 and the ground point 30 to The electrical length paths of the two metal segments 22 are not equal.
  • the length of the second conductor 23 it is also possible to vary the length of the second conductor 23 to change the electrical length path of the ground point 30 to the second metal segment 22 such that the electrical length path of the ground point 30 to the second metal segment 22 and the feed point 10 to the second metal
  • the electrical length paths of segment 22 are not equal.
  • the length of the first conductor 21 and the second conductor 23 simultaneously such that the electrical length path of the feed point 10 to the second metal segment 22 is not equal to the electrical length path of the ground point 30 to the second metal segment 22.
  • two slots are formed on the metal frame of the mobile terminal provided in this embodiment, and the two slots divide the metal frame into three segments of mutually insulated metal segments, wherein the two sides of the two slots are respectively
  • the first metal segment 50 and the third metal segment 60, the metal segment between the two slits is a second metal segment 22, as shown in FIG. 3, the second metal segment 22 is a strip-shaped metal segment.
  • the antenna on the mobile terminal includes: a radiating unit 20, a matching network 40, a feeding point 10, and a grounding point 30, wherein the radiating unit 20 includes a second metal segment 22 and a first conductor 21 and a first metal leg 22 connected thereto Two conductors 23.
  • the first conductor 21 is a conductor of any form, such as a straight line form, a bent line form or the like, and the first conductor 21 and the second metal segment 22 enclose a ring shape. More specifically, the first conductor 21 may be a flexible circuit board, a metal conductive sheet, a laser layer or a thin layer conductor or the like. Or other forms capable of achieving electrical connection between the feed point 10 and the second metal segment 22.
  • the feeding point 10 and the grounding point 30 are located on one side of the center line, and the center line is in the center line of the second metal segment 22, perpendicular to The center line of the second metal segment 22 in the longitudinal direction, when the mobile terminal is a mobile phone, the position corresponding to the center line is the position of the USB interface or the charging interface. Therefore, it can also be understood that the feeding point 10 and the grounding point 30 are located. The same side of the USB interface or charging interface.
  • the position of the feeding point 10 is changed to increase the feeding point 10 to The physical distance of the midpoint of the second metal segment 22, and the feed point 10 and the second metal segment 22 are connected by the first conductor 21, that is, the length of the first conductor 21 is increased, so that the feed point 10 to the second The electrical length path of the metal segment 22 is greater than the electrical length path of the ground point 30 to the second metal segment 22.
  • the electrical length paths of 22 are not equal.
  • the feed point 10 is connected to the first conductor 21 through the matching network 40.
  • the horse The distribution network 40 can be a different matching method of the composition of the capacitor and the inductor, and the plurality of inductors are connected in parallel, the plurality of capacitors are connected in series, or the capacitors and the inductors are connected in series, and the specific manner can be selected according to actual adjustment requirements. And the electrical length path of the feed point 10 to the midpoint of the second metal segment 22 can also be adjusted by the set matching network 40.
  • the grounding point 30 is connected in series or in parallel.
  • the component is implemented to effect an electrical length path that changes the ground point 30 to the midpoint of the second metal segment 22.
  • FIG. 4 shows the manner in which the grounding point 30 is connected in parallel with the reference element.
  • the antenna further includes an adjusting circuit 80 between the grounding point 30 and the feeding point, and the adjusting circuit 80 is a reference component.
  • the composed circuit specifically, the adjusting circuit 80 includes: a plurality of parallel branches, each of which is provided with an inductor or a capacitor or a combination of an inductor and a capacitor, and each branch is grounded; in a specific setting, as shown in FIG. It is shown that a plurality of branches are connected in parallel, and one end of the plurality of branches is connected in series with the second metal segment 22, and the other end is grounded.
  • the second metal segment 22 is selectively connectable to one of the branches of the conditioning circuit 80.
  • a switch is provided on each branch, and the second metal segment 22 is grounded through the branch where the closed switch is located by controlling the opening and closing of the selection switch.
  • a single-pole multi-throw switch can also be used. At this time, the fixed end of the single-pole multi-throw switch is connected with the second metal segment 22, and the movable end is connected with the branch. The single-pole multi-throw switch is used to select a branch for ground connection.
  • the regulating circuit 80 since the regulating circuit 80 is connected in parallel with the grounding point 30, the reference element provided on the adjusting branch changes the electrical length path, thereby causing the electrical length path of the feeding point 10 to the second metal segment 22 and the grounding point 30.
  • the electrical length paths to the second metal segments 22 are not equal.
  • the reference component may be an inductor or a series circuit of an inductor and a capacitor.
  • a plurality of branches are provided with different inductors, and at least one branch is provided with a series of inductors and capacitors.
  • a series arrangement in which a capacitor and an inductor are provided in one circuit is employed. It should be understood that the above-mentioned manner of setting the capacitance and the inductance can be changed according to actual needs. It is not limited to the structure shown in FIG.
  • Figure 5 illustrates the manner in which the ground point 30 is in series with the reference element.
  • the grounding point 30 is connected with a plurality of parallel branches, each of which is provided with an inductor or a capacitor, or a capacitor, and each branch is grounded; the second metal segment 22 is selectively connected to the regulating circuit 80.
  • One branch connection One branch connection.
  • the electrical length path of the ground point 30 to the second metal segment 22 is changed by connecting a plurality of branches in series at the ground point 30.
  • the grounding point 30 is first connected in parallel with a plurality of branches, and the branch is connected to the second metal section 22, and in addition, at the time of connection, at least the inductance and capacitance in series are arranged on each branch, because the electric charge is When flowing through the above components, it is equivalent to changing the electrical length path. Therefore, the electrical length path of the ground point 30 to the second metal segment 22 can be changed by the set inductance or capacitance, or a combination of capacitance and inductance.
  • components of different parameters are disposed on a plurality of branches, and each branch is selectively connected to the grounding point 30 or the second metal segment 22, specifically, as shown in FIG.
  • each branch A switch is provided to enable the second metal segment 22 to be connected to the ground point 30 through one of the branches by opening and closing of the switch.
  • a multi-throw switch can also be used.
  • the fixed end of the single-pole multi-throw switch is connected with the second metal segment 22, and the movable end is connected with the branch.
  • the single-pole multi-throw switch is used to select a branch for ground connection.
  • the adjustment circuit 80 is disposed on the second conductor 23, that is, one end of the adjustment circuit 80 is grounded and the other end is connected to the second conductor 23, and the other end of the second conductor 23 is connected to the second metal segment 22.
  • the reference component may be an inductor, or a capacitor, or a series circuit of a capacitor and an inductor.
  • a plurality of branches are provided with different inductors, and at least one branch is provided with a capacitor connected in series with the inductor.
  • a series connection of a capacitor and an inductor is provided on one circuit. It should be understood that the above capacitor And the way the inductor is set can be changed according to actual needs. It is not limited to the structure shown in FIG.
  • the position of the electric field maximum point is changed by changing the electrical length path of the ground point 30 to the second metal segment 22 in different manners as shown in FIGS. 4 and 5 above.
  • the feeding point 10 and the grounding point 30 can be respectively located on both sides of the center line of the second metal segment 22, and more specifically, the feeding point 10 and the grounding point 30 are arranged in a symmetrical manner. On both sides of the center line of the second metal segment 22.
  • the adjustment circuit 80 can also be disposed on the first conductor 21, that is, the adjustment circuit 80 changes the electrical length path of the feed point 10 to the second metal segment 22.
  • the solutions in Embodiment 1 and Embodiment 2 are simultaneously adopted, that is, the electrical length path of the feeding point 10 to the second metal segment 22 is simultaneously changed, and Electrical length path from ground point 30 to point 22 of second metal segment. And at the time of setting, the path of the ground point 30 and the feeding point 10 to the second metal segment 22 is not equal by reasonable design of the reference element and the lengths of the first conductor 21 and the second conductor 23.
  • the antenna includes a parasitic unit in addition to the structure shown in Embodiment 3.
  • the parasitic unit may be grounded by the first metal segment 50 or the third metal segment 60, and the resonant frequency generated by the parasitic unit may be adjusted by the ground point position; the parasitic unit may also be the first metal segment 50 or the third metal
  • the segment 60 and the metal patch 70 connected at the end of the slot are formed together, and the position of the grounding point and the length of the metal patch 70 together determine the position at which the parasitic element resonates.
  • the metal patch 70 is specifically a flexible circuit board, a metal conductive sheet, a laser layer or a thin layer conductor. As shown in FIG.
  • the metal patch 70 is located on the first metal segment 50 and is located at one end of the first metal segment 50 near the slit.
  • the metal patch 70 may also be disposed on the third metal segment 60 near one end of the slit. It should be understood that the position of the feeding point 10 and the grounding point 30 shown in FIG. 6 is only a specific example, and the grounding point 30 and the feeding point 10 may be opposite to the position shown in FIG. The ground point 30 and the feed point 10 are set in a manner.
  • the top end of the metal patch 70 has a bent structure, and is bent to form a U-shaped frame having an opening whose opening direction is toward the position where the feeding point 10 is located.
  • the parasitic unit can be added to the loop antenna, the flexibility of the tuning of the antenna high frequency can be improved. Especially in the case where the antenna metal frame trace is fixed, the parasitic unit can effectively improve the broadband and radiation efficiency of the mid-high frequency of the loop antenna.
  • the radiating unit 20 provided in this embodiment includes a third conductor 24 and a third conductor 24 in addition to the second metal segment 22, the first conductor 21 and the second conductor 23 included in the above embodiment. Both ends are connected to the first conductor 21 and the second conductor 23, respectively.
  • the first conductor 21, the second metal segment 22, the second conductor 23, and the third conductor 24 enclose a ring shape.
  • the current flowing from the feed point 10 flows through the first conductor 21 to the second metal segment 22, and the current at the ground point flows from the third conductor 23 to the second metal segment 22.
  • the arrangement in the present embodiment can be applied to the first to fourth embodiments, that is, the third conductor 23 can be added to the structure of the radiation unit 20 of the first to fourth embodiments.
  • the third conductor 24 is a flexible circuit board, a metal conductive sheet, a laser layer or a thin layer conductor.
  • FIG. 8a is the electric field of the one-half wavelength mode in the present application.
  • the large-value distribution diagram FIG. 8b is a schematic diagram of the maximum electric field distribution in the one-wavelength mode
  • FIG. 8c is a schematic diagram of the maximum electric field distribution in the three-third mode
  • FIG. 8d is the maximum electric field in the parasitic element resonance mode.
  • the electric field maximum value is It is far away from the gap, thereby overcoming the following two problems of the antenna of the mobile terminal in the prior art: a) the antenna is loaded large, the radiation aperture is small, and the bandwidth and the radiation efficiency are poor, and in the case of a large screen with a small clearance, the problem is more Severe; b) The large electric field is close to the hand, and the antenna is greatly affected by the hand. The purpose of improving the antenna effect is achieved.
  • the present application further provides a mobile terminal, which may be a common mobile terminal device such as a mobile phone or a tablet computer, and has a metal frame with at least two slits. Therefore, the metal frame is divided into a plurality of mutually insulated metal segments. Specifically, the metal frame is provided with two slits, and the two slits divide the metal frame into the first metal segment 50 and the second metal segment 22 which are insulated from each other.
  • the third metal segment 60 further includes the antenna of any of the above.

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Abstract

一种移动终端的天线及移动终端，该移动终端的金属框上开设有至少两条缝隙，两条缝隙将金属框分割成第一金属段、第二金属段以及第三金属段，天线的辐射单元包括位于两个缝隙之间的第二金属段，第一导体，以及第二导体，且第一导体及第二导体分别与第二金属段连接；馈电点通过匹配网络与第一导体连接；接地点与第二导体连接，以形成环天线；且电流从馈电点到第二金属段的电长度路径不等于电流在接地点到第二金属段的电长度路径。在上述技术方案中，通过采用馈电点及接地点设置在金属段的中心线的一侧，并且辐射单元采用环形的结构形成环天线，从而改变电场的最大点远离金属边框的缝隙，进而降低手对模态电场的影响，从而提高天线的性能。

Description

一种移动终端的天线及移动终端
本申请要求在2017年3月20日提交中国专利局、申请号为201710166832.4、发明名称为“一种天线”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信技术领域，尤其涉及一种移动终端的天线及移动终端。
背景技术
传统的T型天线原理如上图1所示。由图1可以看出，该T型天线采用金属边框作为天线的辐射单元，并且该金属边框上开设了至少两个缝隙，缝隙将金属边框分割成三个金属段，分别标记为第一金属段1、第二金属段2及第三金属段3，其中，第二金属段2与馈电点4连接，并且在具体连接时，馈电点4通过匹配网络与第二金属段2连接，该T型天线的电流在移动终端的金属边框上分布，一并参考图2a～图2d，其中，图2a为馈电到左侧缝隙长枝节四分之一波长模态下的电场最大值分布示意图，图2b为第二金属段2整枝节一倍波长模态下的电场最大值分布示意图，图2c为馈电到右侧缝隙短枝节四分之一模态下的电场最大值分布示意图，图2d为馈电到左侧缝隙长枝节四分之三波长模态电场最大值分布示意图，其中，圆圈表示相应模态的电场最大点。由图2a～图2d可见，各模态电场的最大点一般均在金属边框的缝隙处，从而使得天线加载较大，辐射孔径小，导致带宽和辐射效率差，在大屏占比小净空的情况下，更是如此。此外，一般为了实现低频谐振，天线缝隙的位置在设置时靠近金属边框的边缘。因而造成大电场区离手较近，天线受手的影响较大。
发明内容
本申请实施例提供了一种移动终端的天线及移动终端，用以改善移动终端的天线的性能。
第一方面，提供一种移动终端的天线，该移动终端具有金属框，且该金属框上开设有至少两条缝隙，所述两条缝隙将所述金属框分割成第一金属段、第二金属段以及第三金属段，所述天线包括辐射单元，匹配网络，馈电点以及接地点，其中，
所述辐射单元包括位于所述两个缝隙之间的第二金属段，第一导体，以及第二导体，且所述第一导体与所述第二金属段的一端连接，且所述第一导体与所述第二金属段的连接点为馈电接触点；所述第二导体与所述第二金属段的另一端连接，且所述第二导体与所述第二金属段的连接点为接地接触点；所述馈电点与所述接地点的垂直距离小于所述馈电接触点与所述接地接触点的垂直距离；
所述馈电点通过所述匹配网络与所述第一导体连接；
所述接地点与所述第二导体连接；
且电流从所述馈电点到所述第二金属段的电长度路径不等于电流在所述接地点到所述第二金属段的电长度路径。
在上述技术方案中，通过改变第一导体和第二导体的长度，使得电流在所述馈电点到 所述第二金属段的电长度路径与在所述接地点到所述第二金属段的电长度路径不相等，从而使得各模态电场的最大点远离金属边框的缝隙，进而减小缝隙的电场加载以及降低手对模态电场的影响，从而提高天线的性能。
在一个具体的实施方案中，所述馈电点通过匹配网络与所述第一导体连接。该匹配网络可以由电控开关，可变电容，电容，电感组成，以并联或串联形式连接。
在具体设置时，馈电点既可以与接地点分别位于中心线的两侧，也可以采用所述馈电点及所述接地点位于中心线的一侧，所述中心线为所述第二金属段的中心线中，垂直于所述第二金属段长度方向的中心线。
在一个具体的实施方案中，还包括位于所述接地点与所述馈电线之间的调节电路，所述调节电路包括：多个并联的支路，每个支路上设置有电感或电容，每个支路接地；所述第二金属段可选择地与所述调节电路中的一个支路连接。通过设置调节电路可改变所述天线的有效电长度，以达到调谐天线谐振频率的目的。在具体设置时，每个支路上设置一个开关，或者采用单刀多掷开关，实现地点与一个支路连接。
在一个具体的实施方案中，至少一个支路上设置有串联的电感及电容。通过改变上述的电容或电感值可改变所述天线的有效电长度，以达到调谐天线谐振频率的目的。
在一个具体的实施方案中，所述第二导体上设置有调节电路，所述调节电路包括多个并联的支路，每个支路上设置有电感，每个支路与所述接地点连接；所述第二金属段可选择地与所述调节电路中的一个支路连接。通过设置调节电路可改变所述天线的有效电长度，以达到调谐天线谐振频率的目的。在具体设置时，每个支路上设置一个开关，或者采用单刀多掷开关，实现地点与一个支路连接。
在一个具体的实施方案中，至少一个支路上设置有串联的电感及电容。通过改变电容或电感值可改变所述天线的有效电长度，以达到调谐天线谐振频率的目的。
在一个具体的实施方案中，该天线还包括一个或两个寄生单元，所述寄生单元可由所述第一金属段或第三金属段接地构成。所述寄生单元的谐振频率可由接地点调节。
在一个具体的实施方案中，所述寄生单元为第一金属段、第三金属段，或者第一金属段以及设置在所述第一金属段的缝隙端点的金属贴片、或第三金属段以及设置在所述第三金属段的缝隙端点的金属贴片。
在一个具体的实施方案中，所述金属贴片为柔性电路板、金属导电片、镭射层或薄层导体。
在一个具体的实施方案中，所述第一导体和第二导体通过除第二金属段之外的第三导体连接，所述的第三导体为柔性电路板、金属导电片、镭射层或薄层导体。
第二方面，提供了一种移动终端，该移动终端包括金属框，且该金属框上至少开设有两条缝隙，所述两条缝隙将所述金属框分割成相互绝缘的第一金属段、第二金属段以及第三金属段，还包括上述任一项所述的天线。
在上述技术方案中，通过改变第一导体和第二导体的长度，使得电流在所述馈电点到所述第二金属段的电长度路径与在所述接地点到所述第二金属段的电长度路径不相等，从而使得各模态电场的最大点远离金属边框的缝隙，进而减小缝隙的电场加载以及降低手对模态电场的影响，从而提高天线的性能。
附图说明
图1为现有技术中的移动终端的天线的结构；
图2a～图2d为图1所示的天线在不同频段下的模态电场最大值的分布示意图；
图3为本申请实施例提供的天线结构示意图；
图4为本申请实施例提供的天线并联谐振电调的结构示意图；
图5为本申请实施例提供的天线串联谐振电调的结构示意图；
图6为本申请实施例提供的另一种天线结构示意图；
图7为本申请实施例提供的另一种天线结构示意图；
图8a～图8d为图6所示的天线在不同频段下的模态电场最大值的分布示意图。
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述。
本实施例提供的天线应用到移动终端上，该移动终端可以为手机、平板电脑等常见的移动终端设备，并且，该移动终端设备具有一个金属框，该金属框上至少开设有两条缝隙，从而将金属框分割成多个相互绝缘的金属段，在本实施例中，如图3所示，金属框上开设了两个缝隙，两个缝隙将金属框分割成：第一金属段50、第二金属段22及第三金属段60。
继续参考图3，本实施例提供的天线包括辐射单元20、匹配网络40、馈电点10及接地点30。该辐射单元20一端通过匹配网络与馈电点10连接，另一端与接地点30连接。在具体连接时，如图3所示，辐射单元20包括三部分：分别为第二金属段22、第一导体21及第二导体23；在连接时，该第一导体21及第二导体23分别与第二金属段22的两端连接，即第一导体21与第二金属段22的一端连接，第二导体23与第二金属段22的另一端连接，其中，第二金属段22的端指示的第二金属段22靠近缝隙的端部，该端部为具有一端长度(如小于5mm)的金属段，第一导体21及第二导体23可以与该金属段上的任意位置连接。第一导体21与第二金属段22的连接点为馈电接触点80，第二导体23与第二金属段22的连接点为接地接触点90；继续参考图3，由图3可以看出，馈电点10与接地点30的垂直距离d小于馈电接触点80与接地接触点90的垂直距离D；更具体的，馈电点10与接地点30的垂直距离d远远小于馈电接触点80与接地接触点90的垂直距离D，如d与D的比值介于1/5～1/2之间。应当理解的是，该比值仅仅是为了说明两者之间的距离存在很大的差异，并无直接的对应关系。采用该方式时，使得形成的天线可以适用于不同的频段，更好的提高了天线的性能。
如图3所示，馈电点10及接地点30位于第二金属段22的同一侧，并且第一导体21，第二导体23及所述第二金属段22围成具有开口的环形，从而形成一个环天线。在具体设置时，馈电点10以及接地点30到第二金属段22的电长度路径(电荷从一点流动到另一点时走过的路径长度)不同，即电流在所述馈电点10到所述第二金属段22走的电长度路径与在所述接地点30到所述第二金属段22走的电长度路径不相等。
如图2a～图2d所示为传统T天线的最大电场分布示意图。其中，图2a为长枝节四分 之一波长模态下的电场最大值分布示意图，图2b为整枝节一倍波长模态下的电场最大值分布示意图，图2c为短枝节四分之一模态下的电场最大值分布示意图，图2d为长枝节四分之三波长模态电场最大值分布示意图；由图2a、图2b、图2c及图2d可以看出，在现有技术中的T型天线采用该模式时，电场最大值位于缝隙的位置，造成大电场区离手较近，天线受手的影响较大，影响到天线的性能。
而在本申请中，通过改变馈电点10及接地点30到第二金属段22的电长度路径，从而使得各模态电场的最大点远离金属边框的缝隙，进而减小缝隙的电场加载以及降低手对模态电场的影响，从而提高天线的性能。在具体改变时，可以通过改变第一导体21的长度从而改变馈电到第二金属段22的电长度路径，使得馈电点10到第二金属段22的电长度路径和接地点30到第二金属段22的电长度路径不相等。还可以采用改变第二导体23的长度，从而改变接地点30到第二金属段22的电长度路径，使得接地点30到第二金属段22的电长度路径和馈电点10到第二金属段22的电长度路径不相等。还可以采用同时改变第一导体21和第二导体23的长度，使得馈电点10到第二金属段22的电长度路径与接地点30到第二金属段22的电长度路径不相等。还可以通过并联调节电路80来使得馈电点10到第二金属段22的电长度路径与接地点30到第二金属段22的电长度路径不相等。还可以通过串联或者并联调节电路80来使得馈电点10到第二金属段22的电长度路径与接地点30到第二金属段22的电长度路径不相等。为了方便理解上述不同的改变方式，下面结合具体的附图对本申请实施例提供的天线进行详细的描述。
实施例1
继续参考图3，本实施例提供的移动终端的金属框上开设了两个缝隙，该两个缝隙将金属框分割成三段相互绝缘的金属段，其中，位于两个缝隙两侧的分别为第一金属段50及第三金属段60，位于两个缝隙之间的金属段为第二金属段22，如图3所示，该第二金属段22为一直条形的金属段。该移动终端上的天线包括：辐射单元20、匹配网络40、馈电点10以及接地点30，其中辐射单元20包括第二金属段22以及与第二金属段22连接的第一导体21和第二导体23。该第一导体21为任意形式的导体，比如直线形式，弯折线形式等，并且第一导体21与第二金属段22围成一个环形。更具体的，该第一导体21可以为柔性电路板、金属导电片、镭射层或薄层导体等。或者其他能够实现馈电点10与第二金属段22实现电连接的形式。
在具体设置时，如图3所示，在本实施例中，馈电点10及接地点30位于中心线的一侧，并且，该中心线为第二金属段22的中心线中，垂直于第二金属段22长度方向的中心线，在该移动终端为手机时，该中心线对应的位置为USB接口或充电接口的位置，因此，也可以理解为，馈电点10及接地点30位于USB接口或充电接口的同一侧。在该方式中，可以理解为将馈电点10以及接地点30到第二金属段22的中点的电长度路径相同的情况下，改变馈电点10的位置，以增长馈电点10到第二金属段22的中点的物理距离，并且馈电点10与第二金属段22之间通过第一导体21连接，即增长第一导体21的长度，从而使得馈电点10到第二金属段22的电长度路径大于接地点30到第二金属段22的电长度路径。在采用该方式时，可以理解成通过改变第一导体21和第二导体23的长度，使得馈电点10到所述第二金属段22的电长度路径与在接地点30到第二金属段22的电长度路径不相等。
在本实施例中，如图3所示，馈电点10通过匹配网络40与第一导体21连接。该匹 配网络40可以为电容及电感的组成的不同匹配方式，多个电感并联、多个电容串联、或者电容与电感串联等不同的方式，具体的可以根据实际的需要调节的情况进行选择。并且通过设置的匹配网络40也可以调节馈电点10到第二金属段22的中点的电长度路径。
实施例2
一并参考图4及图5，在图4及图5所示的方案中，通过改变接地点30到第二金属段22的电长度路径，在具体改变时，通过接地点30串联或者并联参考元件以实现改变接地点30到第二金属段22的中点的电长度路径。
如图4所示，图4示出了接地点30与参考元件并联的方式，此时，该天线还包括位于接地点30与馈电点之间的调节电路80，该调节电路80为参考元件组成的电路，具体的，调节电路80包括：多个并联的支路，每个支路上设置有电感或者电容或者电感和电容组合，并且每个支路接地；在具体设置时，如图4所示，多个支路并联连接，并且多个支路的一端与第二金属段22串联，另一端接地。并且在具体连接时，第二金属段22可选择地与调节电路80中的一个支路连接。参考图4，在图4中，每个支路上设置了一个开关，通过控制选择开关的打开以及关闭实现第二金属段22通过闭合的开关所在的支路进行接地。此外，还可以采用单刀多掷开关，此时，单刀多掷开关的不动端与第二金属段22连接，动端与支路连接，通过单刀多掷开关实现选择一个支路进行接地连接。在采用上述方式时，由于调节电路80与接地点30并联，调节支路上设置的参考元件改变电长度路径，从而使得馈电点10到所述第二金属段22的电长度路径与接地点30到所述第二金属段22的电长度路径不相等。
其中的参考元件可以为电感、或者电感与电容的串联电路，如图4所示，其中的多个支路上设置不同的电感，且至少一个支路上设置有串联的电感及电容。在图4所示的结构中，采用一个电路上设置了电容及电感的串联方式。应当理解的是，上述电容及电感的设置方式可以根据实际的需要进行改变。不仅限于图4所示的结构。
如图5所示，图5示出了接地点30与参考元件串联的方式。在该天线中，接地点30连接有多个并联的支路，每个支路上设置有电感或电容、或电容，并且每个支路接地；第二金属段22可选择地与调节电路80中的一个支路连接。通过在接地点30串联多个支路改变接地点30到第二金属段22的电长度路径。即在设置时，接地点30先并联了多个支路，该支路再与第二金属段22连接，此外，在连接时，每个支路上至少设置了串联的电感及电容，由于电荷在流经上述元器件时，相当于改变了电长度路径，因此，通过设置的电感或电容、或电容和电感组合可以改变接地点30到第二金属段22的电长度路径。在具体设置时，多个支路上设置了不同参数的元器件，并且每个支路与接地点30或者第二金属段22可选择的连接，具体的，如图5所示，每个支路上设置了开关，通过开关的打开及关闭实现了第二金属段22通过其中的一个支路与接地点30连接。还可以采用一刀多掷开关，此时，单刀多掷开关的不动端与第二金属段22连接，动端与支路连接，通过单刀多掷开关实现选择一个支路进行接地连接。在具体设置时，第二导体23上设置上述调节电路80，即可调电路80一端接地另一端接第二导体23，第二导体23另一端与第二金属段22连接。
其中的参考元件可以为电感、或者电容、或者电容和电感的串联电路，如图5所示，其中的多个支路上设置不同的电感，且至少一个支路上设置有与电感串联的电容。在图5所示的结构中，采用一个电路上设置了电容及电感的串联方式。应当理解的是，上述电容 及电感的设置方式可以根据实际的需要进行改变。不仅限于图5所示的结构。
通过上述图4及图5所示的通过不同的方式改变接地点30到第二金属段22的电长度路径，从而改变电场最大点产生的位置。
在采用此种方式时，可以采用馈电点10及接地点30分别位于第二金属段22的中心线的两侧，更具体的，采用馈电点10及接地点30采用对称的方式分列在第二金属段22的中心线的两侧。
此外，在采用调整电路80时，该调整电路80还可以设置在第一导体21上，即通过调整电路80来改变馈电点10到第二金属段22的电长度路径。
实施例3
一并参考图3、图4及图5，在本实施例中，同时采用实施例1及实施例2中的方案，即同时改变馈电点10到第二金属段22的电长度路径，以及接地点30到第二金属段22点的电长度路径。并且在设置时，通过合理的设计参考元件以及第一导体21和第二导体23的长度，使得接地点30与馈电点10分别到第二金属段22的路径不相等。
实施例4
如图6所示，该天线除了包含实施例3中所示的结构外，还包括寄生单元。在具体设置时，该寄生单元可由所述第一金属段50或第三金属段60接地构成，寄生单元产生的谐振频率可由接地点位置调节；寄生单元还可由第一金属段50或第三金属段60以及在其缝隙端点(缝隙端点为金属段靠近缝隙的一端)相连的金属贴片70一起构成，接地点的位置和金属贴片70的长度共同决定寄生单元谐振的位置。上述金属贴片70在具体制备时为柔性电路板、金属导电片、镭射层或薄层导体。如图6所示，此时，金属贴片70位于第一金属段50上，且位于第一金属段50靠近缝隙的一端。此外，金属贴片70还可以设置在第三金属段60上靠近缝隙的一端。应当理解的是，图6中所示的馈电点10及接地点30的设置位置仅仅为一个具体的示例，还可以采用接地点30与馈电点10与图6中所示的位置相反的方式设置接地点30以及馈电点10。
在具体设置时，该金属贴片70的顶端具有一个折弯的结构，且折弯形成一个具有开口的U形框，该U形框的开口方向朝向馈电点10所在的位置。
在将寄生单元可增加环天线中，可以提高天线高频的调谐的灵活性。特别是在该天线金属边框走线固定的情况下，该寄生单元可有效地改善环天线的中高频的宽带和辐射效率。
实施例5
如图7所示，本实施例提供的辐射单元20除了上述实施例中包括的第二金属段22、第一导体21及第二导体23外，还包括第三导体24，且第三导体24的两端分别与第一导体21及第二导体23连接。此时，第一导体21、第二金属段22、第二导体23、第三导体24围成一个环形。此时，从馈电点10流出的电流，流经第一导体21到第二金属段22，接地点的电流从第三导体23流到第二金属段22。在本实施例中的设置方式，可以应用到实施例1～实施例4中，即第三导体23可以添加上实施例1～实施例4中的辐射单元20的结构中。
在具体设置时，第三导体24为柔性电路板、金属导电片、镭射层或薄层导体。
为了方便理解本实施例提供的天线，下面以图6所示的结构为例进行不同模态下的仿真处理。一并参考图8a～图8d，其中，图8a为本申请中的二分之一波长模态下的电场最 大值分布示意图、图8b为一倍波长模态下的电场最大值分布示意图，图8c为二分之三模态下的电场最大值分布示意图，图8d为寄生单元谐振模态下的电场最大值分布示意图；其中黑圆圈表示电场最大点，由图8a、图8b、图8c及图8d可以看出，在本申请中的天线采用上述结构时，当处于不同的模式时，电场最大值均远离缝隙，从而克服现有技术中移动终端的天线存在的如下两个问题：a)天线加载较大，辐射孔径小，导致带宽和辐射效率差，在大屏占比小净空的情况下，问题更加严重；b)大电场区离手较近，天线受手的影响较大。达到了改善天线效果的目的。
此外，本申请还提供了一种移动终端，该移动终端可以为手机、平板电脑等常见的移动终端设备，并且，该移动终端设备具有一个金属框，该金属框上开设有至少两个缝隙，从而将金属框分割成多个相互绝缘的金属段，具体的，该金属框上开设有两条缝隙，两条缝隙将金属框分割成相互绝缘的第一金属段50、第二金属段22以及第三金属段60，还包括上述任一项的天线。
在上述技术方案中，通过改变馈电点10或接地点30与第二金属段22连接的结构，使得电流在馈电点10到第二金属段22的电长度路径与在接地点30到第二段金属段的电长度路径不相等，从而改变电场的最大点远离金属边框的缝隙，进而降低手对模态电场的影响，从而提高天线的性能。
显然，本领域的技术人员可以对本申请实施例进行各种改动和变型而不脱离本申请的精神和范围。这样，倘若本申请实施例的这些修改和变型属于本申请权利要求及其等同技术的范围之内，则本申请也意图包含这些改动和变型在内。

Claims (11)

  1. 一种移动终端的天线，所述移动终端具有金属框，且该金属框上开设有至少两条缝隙，所述两条缝隙将所述金属框分割成第一金属段、第二金属段以及第三金属段，其特征在于，所述天线包括辐射单元，匹配网络，馈电点以及接地点，其中，
    所述辐射单元包括位于所述两个缝隙之间的第二金属段，第一导体，以及第二导体，且所述第一导体与所述第二金属段的一端连接，所述第一导体与所述第二金属段的连接点为馈电接触点；所述第二导体与所述第二金属段的另一端连接，且所述第二导体与所述第二金属段的连接点为接地接触点；所述馈电点与所述接地点的垂直距离小于所述馈电接触点与所述接地接触点的垂直距离；
    所述馈电点通过所述匹配网络与所述第一导体连接；
    所述接地点与所述第二导体连接；
    且电流从所述馈电点到所述第二金属段的电长度路径不等于电流在所述接地点到所述第二金属段的电长度路径。
  2. 如权利要求1所述的移动终端的天线，其特征在于，所述馈电点及所述接地点位于中心线的一侧，所述中心线为所述第二金属段的中心线中，垂直于所述第二金属段长度方向的中心线。
  3. 如权利要求1或2所述的移动终端的天线，其特征在于，还包括位于所述接地点与所述馈电线之间的调节电路，所述调节电路包括：多个并联的支路，每个支路上设置有电感或电容，每个支路接地；所述第二金属段可选择地与所述调节电路中的一个支路连接。
  4. 如权利要求3所述的移动终端的天线，其特征在于，至少一个支路上设置有串联的电感及电容。
  5. 如权利要求1或2所述的移动终端的天线，其特征在于，所述第二导体上设置有调节电路，所述调节电路包括多个并联的支路，每个支路上设置有电感或电容，每个支路与所述接地点连接；所述第二金属段可选择地与所述调节电路中的一个支路连接。
  6. 如权利要求5所述的移动终端的天线，其特征在于，至少一个支路上设置有串联的电感及电容。
  7. 如权利要求1～6任一项所述的移动终端的天线，其特征在于，还包括至少一个寄生单元。
  8. 如权利要求5所述的移动终端的天线，其特征在于，所述寄生单元为第一金属段、第三金属段，或者第一金属段以及设置在所述第一金属段的缝隙端点的金属贴片、或第三金属段以及设置在所述第三金属段的缝隙端点的金属贴片。
  9. 如权利要求1～8任一项所述的移动终端的天线，其特征在于，所述第一导体为柔性电路板、金属导电片、镭射层或薄层导体。
  10. 如权利要求1～9任一项所述的移动终端的天线，其特征在于，还包括第三导体，所述第三导体的两端分别与所述第一导体及第二导体连接。
  11. 一种移动终端，其特征在于，包括金属框，且该金属框上至少开设有两条缝隙，所述两条缝隙将所述金属框分割成相互绝缘的第一金属段、第二金属段以及第三金属段，还包括如权1～10任一项所述的天线。
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