CN105789881B - Mobile terminal - Google Patents
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- CN105789881B CN105789881B CN201410822531.9A CN201410822531A CN105789881B CN 105789881 B CN105789881 B CN 105789881B CN 201410822531 A CN201410822531 A CN 201410822531A CN 105789881 B CN105789881 B CN 105789881B
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Abstract
The invention discloses a kind of mobile terminal, which includes: shell；Printed wiring board among shell, including main circuit region and empty regions are set, wherein empty regions are located at the lower section in main circuit region；Around the metal edge frame of shell, the first frame and the second frame including being located at shell two sides, and positioned at the third frame of housing bottom, third frame has the first side seam and the second side seam, and the frame shape between the first side seam and the second side seam is at antenna main radiator；One end of first connector, the first connector is connected with antenna main radiator；Matching network is fed, the one end for feeding matching network is connected with the other end of the first connector, and the other end for feeding matching network is connected with the feed port in main circuit region, and the first connector and feed matching network are arranged in empty regions.The mobile terminal reduces costs, and improves antenna radiation performance and debugging is convenient.
Description
Technical field
The present invention relates to field of communication technology more particularly to a kind of mobile terminals.
Background technique
Cellular (cellular antenna) primary antenna design difficulty of metal edge frame mobile phone is very big, on the one hand, especially 4G
LTE (Long Term Evolution, long term evolution are forth generation portable antenna standard) mobile phone bandwidth and penetrates antenna band
Frequency performance requirement is more and more harsher, and on the other hand the increased metal edge frame of surrounding will cause antenna radiation performance presses down significantly
System.This results in or makes trade-offs or dash forward between metal edge frame design of the mobile phone radio frequency performance with beautiful metal-like
It breaks existing antenna technology and creates new antenna technology so that the two is taken into account.
For the Cellular antenna in 4G LTE mobile phone, substantially there are following three kinds of schemes: one of scheme in the related technology
It is using FPC (Flexible Printed Circuit, flexible printed circuit board) or LDS (Laser Direct
Structuring, laser direct forming) antenna is made on isolated plastic stent or plastic housing by technique, cause metal edge frame
Antenna RF performance cannot be caused bad with antenna integrated design；Scheme second is that the bottom frame of symmetry slot as antenna spoke
Beam direct feed causes antenna adjustment difficult；Scheme is third is that a part of antenna radiator makees antenna using FPC or LDS
On isolated plastic stent or plastic housing, another part antenna radiator is connected directly between on bottom metal frame, due to needing
Additional FPC or LDS antenna element is wanted to cause cost excessively high, assembly is complicated.
Summary of the invention
The present invention is directed to solve at least some of the technical problems in related technologies.For this purpose, of the invention
One purpose is to propose a kind of mobile terminal, which reduces costs, improve antenna radiation performance and debugging side
Just flexibly.
To achieve the goals above, the mobile terminal of the embodiment of the present invention, comprising: shell；It is arranged among the shell
Printed wiring board, the printed wiring board includes main circuit region and empty regions, wherein the empty regions are located at described
The lower section in main circuit region；Around the metal edge frame of the shell, the metal edge frame includes positioned at the of the shell two sides
One frame and the second frame, and the third frame positioned at the housing bottom, wherein the third frame and first side
Frame and the second frame are respectively connected with, and the third frame has the first side seam and the second side seam, wherein first side seam and the
Frame shape between two side seams is at antenna main radiator；First connector, one end of first connector and the antenna master
Radiator is connected；Matching network is fed, one end of the feed matching network is connected with the other end of first connector, institute
State feed matching network the other end be connected with the feed port in the main circuit region, wherein first connector with
The feed matching network is arranged in the empty regions.
1) mobile terminal according to an embodiment of the present invention, has the advantages that；Additional antenna element is not needed,
Thus greatly reduce cost；2) using metal edge frame as radiator, the utilization rate in aerial radiation space is improved, day is improved
Beta radiation performance；3) antenna adjustment in product development does not need the shape and size of fine tuning metal edge frame, avoids metal
The structure of frame changes the demand of mould；4) convenient, flexible to the debugging of antenna resonance and bandwidth；5) 5 modes of resonance are realized, it can
With frequency range demand needed for covering 4G LTE well.
Detailed description of the invention
Fig. 1 is the first design to crack in the related technology for mobile phone bottom metal frame；
Fig. 2 is the second design to crack in the related technology for mobile phone bottom metal frame；
Fig. 3 is the structural schematic diagram of mobile terminal according to an embodiment of the invention；
Fig. 4 is antenna design schematic diagram in mobile terminal according to an embodiment of the invention；
Fig. 5 is that structural schematic diagram is flutterred in the circuit expansion of feed matching network according to an embodiment of the invention；
Fig. 6 is equivalent circuit diagram of the feed matching network according to an embodiment of the invention in high band；
Fig. 7 is equivalent circuit diagram of the feed matching network according to an embodiment of the invention in low-frequency range；
Fig. 8 is the antenna impedance curve graph for not introducing feed matching network；
Fig. 9 is the antenna RL curve graph for not introducing feed matching network；
Figure 10 is the antenna impedance curve graph according to an embodiment of the invention for only introducing high-frequency matching network；
Figure 11 is the antenna RL curve graph according to an embodiment of the invention for only introducing high-frequency matching network；
Figure 12 is the antenna impedance curve graph according to an embodiment of the invention for only introducing low-frequency matching network；
Figure 13 is the antenna RL curve graph according to an embodiment of the invention for only introducing low-frequency matching network；
Figure 14 is the antenna impedance curve graph of the complete feed matching network of introducing according to an embodiment of the invention；
Figure 15 is the antenna RL curve graph of the complete feed matching network of introducing according to an embodiment of the invention；
Figure 16 is the antenna holder composition of representative instance one according to the present invention；
Figure 17 is the corresponding antenna impedance curve graph of representative instance one according to the present invention；
Figure 18 is the corresponding antenna RL curve graph of representative instance one according to the present invention；
Figure 19 is the antenna holder composition of representative instance two according to the present invention；
Figure 20 is the corresponding antenna impedance curve graph of representative instance two according to the present invention；
Figure 21 is the corresponding antenna RL curve graph of representative instance two according to the present invention.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
The scheme for the Cellular antenna being directed in 4G LTE mobile phone in the related technology is analyzed first.
Wherein, scheme one: or use traditional antenna scheme, i.e., antenna is accomplished using FPC LDS production technology
On isolated plastic stent or plastic housing, antenna adjustment does not have essential area with the antenna adjustment of the nonmetallic frame mobile phone of tradition
Not, a part on metal edge frame here as mobile phone ground, while the seam of 0.8~1mm is opened in appropriate location on metal edge frame side, with
And the grounding point position of optimization metal edge frame, to reduce influence of the metal edge frame to antenna adjustment and performance.But deficiency
Place has, and needs additional FPC or LDS antenna element, mobile phone cost is occupied, in addition, since metal edge frame is to antenna radiation performance
Cause to significantly affect, cause its radio-frequency performance limited, especially for 4G LTE mobile phone instantly, frequency range to cover (24~
960MHz, 1710~2700MHZ) become almost impossible.
Scheme two: the bottom metal frame of symmetry slot is as antenna radiator direct feed, and in PWB (Printed
Wiring Board, printed wiring board) on introduce matching network to carry out antenna by force on feeder line near the feed port
Impedance matching.Its shortcoming has, and antenna adjustment is difficult, and it is to be difficult manually more that the size of one side metal edge frame, which increases and shortens,
Change, if changing design and mold by structure come verifying of drawing a design, the costly period is long, on the other hand if it is using tradition
Feed end matching process, especially when antenna initial impedance cannot by chance fall on it is optimal can matching area when,
Bandwidth match needed for realizing at wider bandwidth range (824~960MHz, 1710~2700MHZ) is extremely difficult, so
Finally it is difficult to obtain optimal antenna RF performance.
Scheme three, it may be said that be mixture of the scheme one with scheme two, i.e., a part of antenna radiator using FPC or
LDS production technology accomplishes antenna on isolated plastic stent or plastic housing that a part of aerial radiation cognition is directly connected to bottom
On portion's metal edge frame, while on PWB, or even on the FPC of antenna element introduce matching network.Its shortcoming has, and needs
Additional FPC or LDS antenna element occupies mobile phone cost, and structure design and production assembly are complicated.
To solve the above-mentioned problems, the invention proposes a kind of mobile terminals.Below with reference to the accompanying drawings the description present invention is implemented
The mobile terminal of example.
Currently, there are two types of types in the related technology: type one: such as Fig. 1 for the design that mobile phone bottom metal frame cracks
It is shown, it cracks at left and right side (such as iPhone)；Type two: as shown in Fig. 2, cracking in bottom side.Wherein, type one is can
The optimal antenna aspect of performance of acquisition is advantageous, but also has critical defect (for example, when especially making a phone call, to crack and be easy by quilt
Hand is held, and mobile phone signal is caused to be lost, so the relevant technologies have done significant improvement on software and hardware, i.e., is lost and is believed in bottom antenna
Number when can be intelligently switched into the head antenna of mobile phone in time, guarantee that signal is continuous).Type two, although this seed type can obtain
Antenna performance and design difficulty in terms of compared with the first seed type there is no advantage, but greatly reduce to crack to be held by hand and cause
The probability of dropout, so there is no need to be improved using the software and hardware of high cost and complexity, so this seed type is general in the related technology
All over the mainstream type used, at the same be also the embodiment of the present invention mobile terminal in provide metal edge frame mobile phone Cellular days
Type that line design scheme was continued to use crack.
Fig. 3 is the structural schematic diagram of mobile terminal according to an embodiment of the invention.As shown in figure 3, the present invention is implemented
The mobile terminal of example, comprising: shell 10, printed wiring board 20, metal edge frame 30, the first connector 40, feed matching network 50.
Wherein, printed wiring board 20 is arranged among shell 10, and printed wiring board 20 includes main circuit region 21 and headroom
Region 22, wherein empty regions 22 be located at be main circuit region 21 lower section (wherein, from figure 3 it follows that 21, main circuit region
In the top of printed wiring board 20, empty regions 22 are located at the lower section in main circuit region 21)；Around the metal edge frame of shell 10
30, metal edge frame 30 includes the first frame 31 and the second frame 32 positioned at 10 two sides of shell, and positioned at 10 bottom of shell
Third frame 33, wherein third frame 33 is respectively connected with the first frame 31 and the second frame 32, and third frame 33 has first
Side seam 2 and the second side seam 3, wherein the frame 4 between the first side seam 2 and the second side seam 3 forms antenna main radiator；First connects
The one end for connecing device 40 is connected with antenna main radiator；Feed one end and the other end phase of the first connector 40 of matching network 50
Even, the other end of feed matching network 50 is connected with the feed port in main circuit region 21, wherein the first connector 40 and feedback
Electric matching network 50 is arranged in empty regions 22.
In one embodiment of the invention, the first side seam 2 and the second side seam 3 are symmetrical.
In one embodiment of the invention, as shown in figure 4, mobile terminal, further includes: multiple first grounding connectors 60
With multiple second grounding connectors 70.
Wherein, multiple first grounding connectors 60 (for example, 60a, 60b, 60c) are by the first frame 31 and main circuit region 21
Ground be connected；Multiple second grounding connectors 70 (for example, 70a, 70b, 70c) are by the ground of the second frame 32 and main circuit region 21
It is connected.The number of first grounding connector 60 and the second grounding connector 70 can be configured according to the actual situation.
In one embodiment of the invention, multiple first grounding connectors 60 and multiple second grounding connectors 70 are uniform
Distribution.
In one embodiment of the invention, the first side seam 2 and first grounding connector 60 adjacent with the first side seam 2
Frame between (i.e. 60c) forms the first parasitic radiator, the second side seam 3 and second grounding connection adjacent with the second side seam 3
Frame between device 70 (i.e. 70c) forms the second parasitic radiator.
Specifically, Fig. 4 is the frame and circuit diagram of mobile terminal according to an embodiment of the invention, such as Fig. 4 institute
Show, the first side seam 2 and the second side seam 3 (for example, side seam size is 0.8mm) are located at the third frame 33 of 10 bottom of shell, and left
It is right symmetrical.In one particular embodiment of the present invention, the length of the antenna main radiator 4 between the first side seam 2 and the second side seam 3
Degree is 40mm (mobile terminal of 5 cun of screens) -46mm (mobile terminal of 5.5 cun of screens), antenna main radiator 4 provided herein
Length be used only to illustrate, be not the restriction to the length of antenna main radiator 4.Antenna main radiator 4 passes through the first connection
Device 40 and empty regions 22 feed matching network 50 (MN1 i.e. shown in figure, the full name of MN are Matching Network,
Matching network) connection.Lower left corner frame 5 in Fig. 4 is cracking 2 with the frame between the first grounding connector 60c, is also being used as day
Beta radiation body, it can be understood as the parasitic element of main radiator 4, i.e. the first parasitic radiator.Lower right corner frame 6 in Fig. 4, is being opened
Seam 3 is also used as radiator, it can be understood as another of main radiator 4 is posted with the frame between the second grounding connector 70c
Raw unit, i.e. the second parasitic radiator.In addition, the first frame 31 passes through first grounding connector 60a, 60b, 60c and main circuit
The ground in region 21 is (for example, PWB grounding or other metals in figure, such as A shell injection molding metal or other gold
Belong to shielding case) it is shorted, constitute mobile terminal completely.In addition, the frame 4 between the first side seam 2 and the second side seam 3, also
It is antenna main radiator, is connected by the first connector 40 with feed matching network 50.
As shown in figure 4, empty regions 22 (it usually suggests > 8mm in mobile terminal length direction), the grounding of PWB
It is disconnected in this region, but retains medium substrate, antenna feed matching network and device can be all put in thereon.That is, feed
The matching inductance L1, L2 and resistance R1 of matching network 50 and parasitic radiator can be placed in PWB empty regions 22.Wherein, right
For PWB plate, from aerial angle, two regions can be divided into: the region PWB grounding (i.e. main circuit region 21) and
PWB empty regions 22, the difference in two regions are ' ground ' that the paving copper of large area is had on the region PWB grounding, and
Paving copper is avoided in PWB empty regions, this usual region does not allow to put other cablings or device in addition to antenna necessity cabling and device
Part.
In one embodiment of the invention, as shown in Figure 4, further includes: the second connector 80, the one of the second connector 80
End is connected with antenna main radiator 4；First inductance L1, one end of the first inductance L1 is connected with the other end of the second connector 80；
First resistor R1, one end of first resistor R1 are connected with the other end of the first inductance L1, the other end of first resistor R1 and main electricity
The ground in road region 21 is connected.
In one embodiment of the invention, the tie point of the second connector 80 and antenna main radiator 4 is located at antenna master
The center of radiator 4.
In one embodiment of the invention, the second connector 80, the first inductance L1 and first resistor R1 are arranged at only
In empty region 22.
Specifically, the about middle position of the frame 4 between the first side seam 2 and the second side seam 3, frame 4 pass through second
Connector 80 and the first inductance L1 (for example, its value is 20~40nH) and first resistor R1 (for example, its resistance value is 0~8ohm) go here and there
Connection, meanwhile, the other end of first resistor R1 is shorted PWB grounding.
More specifically, the effect of the first inductance L1 is: when 4 size of frame is partially long, by introducing the first inductance L1, in electricity
It is equivalent to the electrical length of fine tuning frame 4 on gas, and then finely tunes the impedance of antenna initial low frequency (, tens nHs larger because of inductance value, meeting
High-frequency signal is blocked, so having little effect to antenna initial high frequency impedance), in order to subsequently through feed matching network 50
The optimal impedance bandwidth matching of low frequency is realized, if if the first electricity can also be saved when the size of frame 4 is just suitable certainly
Sense L1 makes its disconnection.The effect of first resistor R1 is, due to the metal edge frame that surrounding surrounds especially low frequency radiation is caused it is bright
Aobvious inhibition especially when antenna empty regions 22 too small (for example, < 8mm) and places other excessive metal devices (such as MIC
(Microphone, microphone), USB (Universal Serial Bus, universal serial bus) etc.) arrive antenna headroom region 22
When, lead to the low-down radiation resistance of antenna low frequency and very high Q (quality factor) value, and then cause antenna low frequency very
Difficulty in specific bandwidth (824~960MHz) realize needed for impedance matching, last resort and introduce first resistor R1, make
Be reduced by suitably increasing aerial loss antenna low frequency Q (quality factor) value (due to series connection the first inductance L1 (20~
Effect 40nH) almost blocks high-frequency signal, so the resistance introduced does not almost have any influence to high frequency antenna performance), into
And antenna is enable to realize impedance matching more easily in low-frequency range to control antenna with the impedance mismatching between radio frequency system and to exist
Acceptable range.The resistance of introducing will increase aerial loss and then reduce antenna low frequency radiation-efficiency, but also improve simultaneously
Reflection loss caused by low-frequency impedance is adapted to, so gross efficiency (the gross efficiency dB=impedance mismatching loss of final antenna low frequency
DB+ antenna radiation efficiency) variation it is unobvious.So first resistor R1, only (for example impedance is lost in the case where last resort
When with causing a hidden trouble to receiver or transmitter job stability) it can just consider to introduce, other situations keep 0ohm.
In one embodiment of the invention, as shown in Figure 4, further includes: third connector 90, the one of third connector 90
It holds and is connected with the third frame 33 in 2 left side of the first side seam；One end of second inductance L2, the second inductance L2 and third connector 90
The other end is connected, and the other end of the second inductance L2 is connected with the ground in main circuit region 21.
In one embodiment of the invention, third connector 90 and the second inductance L2 are arranged in empty regions 22.
Specifically, the metal edge frame 5 in the lower left corner is connected by third connector 90 with one end of the second inductance L2, the second electricity
The other end of sense L2 can directly be shorted to PWB grounding.
More specifically, the second inductance L2 (for example, its value is 1~10nH), effect is, when 5 size of frame is partially long, leads to
It crosses and introduces the second inductance L2, in the electrical length for being electrically equivalent to fine tuning frame 5, and then finely tune resonance frequency corresponding to frame 5
Offset.Certainly, also or appropriate with one section if if the second inductance L2 can also be saved when the size of frame 5 is just suitable
The thin curved conducting wire of the ground connection of length substitutes the second inductance L2 of particular value.
In one embodiment of the invention, as shown in figure 5, feed matching network 50 specifically includes: first capacitor C1, the
One end of one capacitor C1 is connected with the other end of the first connector 40；Third inductance L3, one end of third inductance L3 connect with first
The other end for connecing device 40 is connected；One end of 4th inductance L4, the 4th inductance L4 are connected with the other end of third inductance L3, the 4th electricity
Feel the other end ground connection of L4；One end of 5th inductance L5, the 5th inductance L5 are connected with the other end of third inductance L3；Second capacitor
One end of C2, the second capacitor C2 are connected with the other end of the other end of first capacitor C1 and the 5th inductance L5, the second capacitor C2's
The other end is connected with the feed port in main circuit region 21.
In one embodiment of the invention, first capacitor C1 and the second capacitor C2 composition high frequency channel, third inductance L3,
4th inductance L4, the 5th inductance L5 and the second capacitor C2 constitute low frequency channel.
Specifically, Fig. 5 is that structural schematic diagram is flutterred in the circuit expansion of feed matching network 50.As shown in figure 5, on feeder line
Matching network (i.e. feed matching network 50), is placed in PWB empty regions 22, and feed matching network 50 is by first capacitor C1, the
Two capacitor C2, third inductance L3, the 4th inductance L4 and the 5th inductance L5 composition.Signal is come in from the first connector 40, path
Be divided into two-way, connect all the way series capacitance C1 (it should be added that first capacitor C1 can be a capacitance component,
It can be the gap that both ends cross parallel both ends conducting wire is constituted between coplanar or PWB medium substrate top and bottom and carry out equivalent coupled electricity
Hold), this mainly match to the impedance of antenna high band while generating high impedance to low-band signal all the way；Another way connection
" series inductance L3, shunt inductance L4, series inductance L5 ", this all the way mainly matches antenna low-frequency range impedance, and to height
Frequency signal generates high impedance.This last two-way remerges connects with the second capacitor C2 together, further to antenna low-frequency impedance
Matching, while antenna high-frequency resistance is further finely tuned.This feed matching network 50 can be approximated to be one in a way
C1 and C2, approximate path low frequency (824~960MHz) are passed through in frequency division duplex, the approximate high frequency path (1710~2700MHz)
By L3, L4, L5 and C2.
Further, at high band (1710~2700MHz), the corresponding approximate equivalent circuit of matching network 50 is fed as schemed
Shown in 6, at low-frequency range (824~960MHz), it is as shown in Figure 7 to feed the corresponding approximate equivalent circuit of matching network 50.
More specifically, structure is flutterred in the matching expansion that feed matching network 50 devises a kind of ultra wide band, initially hindered based on antenna
It is anti-can match 5 resonance (two resonance of low-frequency range " LB_F1, LB_F2 ", three resonance of high band " HB_F1, HB_F2,
HB_F3 "), thus frequency range (824~960MHz, 1710~2700MHZ) needed for covering 4G LTE well, design
Thinking is as follows:
Based on not plus when feed matching, typical impedance frequency curve chart (as shown in Figure 8) and RL (Return Loss,
Return loss) frequency curve chart (as shown in Figure 9), it can be seen that antenna initial impedance bandwidth is very undesirable, but
Antenna be can see in the initial impedance of high band in inductor section, if its impedance can be made by introducing series capacitance coupling appropriate
Be fitted on and be implemented around RL≤- 6dB close to 50ohm, in addition it can also be seen that antenna low-frequency range initial impedance in capacitive region,
It can also be made to be impedance-matched to close to 50ohm if introducing " string inductance, and inductance, string inductance and serial capacitors matching " appropriate
It is implemented around RL≤- 6dB.
At this point, serial coupling capacitor impedance matching is carried out to antenna if introducing match circuit as shown in FIG. 6,
After matching impedance frequency curve is as shown in the dotted line in Figure 10 and RL frequency curve is as shown in the dotted line in Figure 11, can see
It is significantly optimized, can be covered (1710~2700MHz) to the impedance of antenna high band, but it also seen that this matching while also antenna
Low-frequency range impedance has been moved on to close to the high resistance regions of open circuit point, to generate blocking to low frequency signal.
In addition, carrying out " string inductance, and inductance, string inductance, string electricity to antenna if introducing match circuit as shown in Figure 7
Hold " matching, the impedance frequency curve after matching is as shown by the dashed lines of figure 12 and the dotted line in RL frequency curve such as Figure 13
It is shown, it can be seen that the impedance of antenna low-frequency range is significantly optimized, and can be covered (824~960MHz), but it also seen that this is matched
Also the impedance of antenna high band has been moved on to close to the high resistance regions of open circuit point simultaneously, so that high-frequency signal generates blocking.
In order to realize that wideband matches, and needs above-mentioned high frequency as shown in Figure 6 simultaneously to low-frequency range and high band antenna impedance
Match circuit and low frequency match circuit as shown in Figure 7 combine, and become final matching network as shown in Figure 5,
It, can shown in dotted line with rear final impedance frequency curve such as in Figure 14 and shown in dotted line of the RL frequency curve such as in Figure 15
To see the height frequency range impedance quilt of antenna while significantly optimize, it can be seen that matched 5 resonance (low frequencies by MN1
Two resonance of section " LB_F1, LB_F2 ", three resonance of high band " HB_F1, HB_F2, HB_F3 "), and then can cover well
The bandwidth demand (824~960MHz, 1710~2700MHz) of 4G LTE.In this 5 modes of resonance, " LB_F1, LB_F2 " are
Got up based on the low-frequency range radiation impedance of frame 4 by low-frequency approximation equivalent matched circuit activation as shown in FIG. 6, HB_F1
Got up based on the high band radiation impedance of frame 4 by high-frequency approximation equivalent matched circuit activation as shown in FIG. 6, HB_F2
It is (to change as the excitation of frame 6 of parasitic element and by what high-frequency approximation equivalent matched circuit as shown in FIG. 6 finely tuned out
The size length of frame 6, can finely tune this resonance shift), HB_F3 is as the excitation of frame 5 of parasitic element and by such as Fig. 6
Shown in high-frequency approximation equivalent matched circuit finely tune out (change frame 5 size length or adjust inductance L2 value, can
To finely tune this resonance shift).
The mobile terminal of the embodiment of the present invention introduces the first inductance L1, the second inductance L2, must be by changing side before being allowed to
Frame 4 can pass through trimming inductance L1, inductance L2 with 5 shape of frame and size just obtainable required antenna initial impedance fine tuning
Value finely tune；In addition, in the case where last resort (such as antenna environment it is exceedingly odious when, cause antenna low frequency very low
Radiation resistance and very high Q (quality factor) value, and then cause how to match again, it is also difficult to realize desired impedance
With), first resistor R1 is introduced, can be imitated in impedance mismatching with antenna own radiation when keeping antenna global radiation efficiency constant
It is balanced between rate, (prevent the extreme case of the job insecurity of transmitting, receiver)；Based on feed matching network
50, the embodiment provides a kind of new ultra wide band matching process and circuit expansion to flutter structure, feeds pair net by this
Network 50, high and low frequency signal path is approximate independent, and then can independently match respectively to antenna high and low frequency impedance approximation
And optimization fine tuning.By this feed matching network 50, match with can be convenient 5 resonance (two resonance of low-frequency range " LB_F1,
LB_F2 ", and three resonance of high band " HB_F1, HB_F2, HB_F3 "), so as to realize ultra wide band well；In addition, this hair
The antenna of the mobile terminal of bright embodiment only includes two parts, and a part does radiator, another part (feedback using metal edge frame
Electric matching network 50) it rests entirely on the medium substrate of PWB empty regions 22, without additional antenna element, for example, being not necessarily to
PFC, LDS etc..
The mobile terminal of the embodiment of the present invention does not need additional FPC or LDS antenna element, has accomplished cost to greatest extent
It is minimum；It is used as radiator using metal edge frame (4,5,6 in Fig. 4), aerial radiation space is utilized to greatest extent, promotes antenna
Radiance；Antenna adjustment in product development does not need the shape and size of fine tuning metal edge frame, has evaded metal edge frame
Structure change the demand of mould；The first inductance L1, the second inductance L2, first resistor R1 and MN1 in PWB empty regions is fully utilized
(feed matching network 50), can be easily and flexibly to antenna resonance and bandwidth fast debugging；Due to provided in an embodiment of the present invention
Antenna scheme realizes 5 modes of resonance, and frequency range demand needed for can covering well 4G LTE (824~960MHz, 1710
~2700MHZ).
1) mobile terminal of the embodiment of the present invention, has the advantages that；Additional antenna element is not needed, thus
Greatly reduce cost；2) using metal edge frame as radiator, the utilization rate in aerial radiation space is improved, antenna spoke is improved
Penetrate performance；3) antenna adjustment in product development does not need the shape and size of fine tuning metal edge frame, avoids metal edge frame
Structure change the demand of mould；4) convenient, flexible to the debugging of antenna resonance and bandwidth；5) 5 modes of resonance are realized, it can be very
Frequency range demand needed for covering 4G LTE well.
Based on antenna design as shown in Figure 4, the present invention provides two kinds respectively for " 5.5 cun of screen metal edges are frameed shift
Dynamic terminal, MIC and USB are placed in antenna headroom region 22 " and " 4.4 cun of screen metal edge frame mobile terminals, only MIC are placed on day
In line empty regions 22 " exemplary embodiments.In the two embodiments, mobile terminal is mobile phone.
Exemplary embodiments one:
As shown in figure 16, this example is the metal edge frame for " 5.5 cun of screens, MIC and USB are placed in antenna headroom region "
Mobile terminal, antenna frame only only introduce the ground area MIC and USB on the basis of scheme as shown in Figure 4
Come in, the essential information in terms of other models is as follows:
The length and width for the square region that metal edge frame is constituted are a height of (147mm*76mm*5.5mm), in order to simulate practical mobile phone modeling
Plastic material (dielectric constant 2.7, the loss angle tangent of thickness 1mm is arranged in the influence of the shell of material above and below square region on space
0.03@10GHz), the length of intermetallic metal frame 4 is 48mm, crack 2,3 width 0.8mm.
PWB empty regions 22 are 8mm in mobile phone length direction.
Selected inductance, capacitance are that L3 is 2nH, and L4 9nH, L5 4nH, C1 1.6pF, C2 1.2pF, L1 are
20nH, L2 1nH, R1 8ohm.
In this example, the corresponding impedance frequency curve of final simulation result is as shown in figure 17, and corresponding RL frequency is bent
Line is as shown in figure 18, sees that especially high frequency bandwidth has a margin very much to see that its bandwidth can satisfy the frequency range demand of 4G LTE.
(in this example, resistance is introduced to improve low-frequency impedance, causes the radiation efficiency of antenna emulation in -3.4dB or so, but due to
The improvement of impedance mismatching, final antenna emulation gross efficiency can also be maintained at > -4.7dB, within tolerance interval).
Exemplary embodiments two:
As shown in figure 19, this example is the metal edge frame for " 4.4 cun of screens, only MIC are placed in antenna headroom region "
Mobile phone, antenna frame have following variation on the basis of scheme as shown in Figure 4:
Because the frame size being arranged substantially meets demand just, dispense due to auxiliary fine tuning metal edge frame electricity
The L1 of size, L2.
Simultaneously because USB is not placed in antenna headroom region and the size of empty regions can be said to be rationally, so also saving
The first resistor R1 for balancing antenna low-frequency impedance mismatch with radiation efficiency is omitted.
In addition the conducting wire that the suspension of one section of end is used in matching network 50 is being fed with metal edge frame 4 and the first connector
Between 40 gap constitute coupled capacitor " first capacitor C1 " come substitute as shown in Figure 5 hurry up matching network 50 in first capacitor
C1.It is designed specifically to, and in as shown in figure 19, in connection C2, the conducting wire middle position 18 of L5 is beaten on PWB medium substrate
Via hole makes conducting wire be conducting to the other one side of PWB medium substrate, and the conducting wire that the end for continuing on this face one section of cloth long suspends
19, the coupled capacitor " C1 " that this conducting wire 19 is constituted with gap between metal edge frame 4 and the first connector 40, by changing this conducting wire
19 length or the size that this coupled capacitor C1 can be finely tuned with a distance from metal edge frame 4.
In this example, the essential information of some other outer dimension of model and inductance capacitance value is as follows: metal edge frame institute
A height of (140mm*70mm*5.5mm) around the rectangular area length and width of composition, 4 length of intermetallic metal frame is 40mm, metal edge frame
Crack width 0.8mm, and PWB empty regions 22 are 8mm in mobile phone length direction, and L3 4nH, L4 2nH, L5 3nH, C2 are
1.4pF。
In this example, the corresponding impedance frequency curve of final simulation result is as shown in figure 20, and corresponding RL frequency is bent
Line is as shown in figure 21, sees to see that bandwidth can satisfy the frequency range demand of 4G LTE.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", "outside", " up time
The orientation or positional relationship of the instructions such as needle ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " be orientation based on the figure or
Positional relationship is merely for convenience of description of the present invention and simplification of the description, rather than the device or element of indication or suggestion meaning must
There must be specific orientation, be constructed and operated in a specific orientation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include at least one this feature.In the description of the present invention, the meaning of " plurality " is at least two, such as two, three
It is a etc., unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The interaction relationship of the connection in portion or two elements, unless otherwise restricted clearly.For those of ordinary skill in the art
For, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
In the present invention unless specifically defined or limited otherwise, fisrt feature in the second feature " on " or " down " can be with
It is that the first and second features directly contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature be directly above or diagonally above the second feature, or be merely representative of
First feature horizontal height is higher than second feature.Fisrt feature can be under the second feature " below ", " below " and " below "
One feature is directly under or diagonally below the second feature, or is merely representative of first feature horizontal height less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiment or examples.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, modifies, replacement and variant.
Claims (12)
1. a kind of mobile terminal characterized by comprising
Shell；
Printed wiring board among the shell is set, the printed wiring board includes main circuit region and empty regions,
In, the empty regions are located at the lower section in the main circuit region；
Around the metal edge frame of the shell, the metal edge frame includes the first frame and the second side positioned at the shell two sides
Frame, and the third frame positioned at the housing bottom, wherein the third frame and first frame and the second frame point
Not Xiang Lian, the third frame have the first side seam and the second side seam, wherein the side between first side seam and the second side seam
Frame forms antenna main radiator；
One end of first connector, first connector is connected with the antenna main radiator；
Matching network is fed, one end of the feed matching network is connected with the other end of first connector, the feed
The other end of matching network is connected with the feed port in the main circuit region, wherein first connector and the feedback
Electric matching network is arranged in the empty regions；
One end of second connector, second connector is connected with the antenna main radiator；
First inductance, one end of first inductance are connected with the other end of second connector, and first inductance is used for
The initial low frequency impedance of the antenna main radiator is finely adjusted；
First resistor, one end of the first resistor are connected with the other end of first inductance, the first resistor it is another
End is connected with the ground in the main circuit region, and the first resistor is used to reduce the low frequency quality factor of the antenna main radiator
Value.
2. mobile terminal as described in claim 1, which is characterized in that first side seam and second side seam are symmetrical point
Cloth.
3. mobile terminal as described in claim 1, which is characterized in that further include:
Multiple first grounding connectors, the multiple first grounding connector is by first frame and the main circuit region
Ground is connected；And
Multiple second grounding connectors, the multiple second grounding connector is by second frame and the main circuit region
Ground is connected.
4. mobile terminal as claimed in claim 3, which is characterized in that the multiple first grounding connector and the multiple
Two grounding connectors are uniformly distributed.
5. mobile terminal as described in claim 3 or 4, which is characterized in that wherein, first side seam and with first side
It stitches frame between adjacent first grounding connector and forms the first parasitic radiator, second side seam and with described the
Frame between adjacent second grounding connector of two side seams forms the second parasitic radiator.
6. mobile terminal as described in claim 1, which is characterized in that second connector and the antenna main radiator
Tie point is located at the center of the antenna main radiator.
7. mobile terminal as described in claim 1, which is characterized in that second connector, first inductance and described
First resistor is arranged in the empty regions.
8. mobile terminal as described in claim 1, which is characterized in that further include:
Third connector, one end of the third connector are connected with the third frame on the left of first side seam；
Second inductance, one end of second inductance are connected with the other end of the third connector, second inductance it is another
One end is connected with the ground in the main circuit region.
9. mobile terminal as claimed in claim 8, which is characterized in that the third connector and second inductance are respectively provided with
In the empty regions.
10. mobile terminal as described in claim 1, which is characterized in that the feed matching network specifically includes:
First capacitor, one end of the first capacitor are connected with the other end of first connector；
Third inductance, one end of the third inductance are connected with the other end of first connector；
One end of 4th inductance, the 4th inductance is connected with the other end of the third inductance, the 4th inductance it is another
End ground connection；
One end of 5th inductance, the 5th inductance is connected with the other end of the third inductance；
Second capacitor, the other end phase of one end of second capacitor and the other end of the first capacitor and the 5th inductance
Even, the other end of second capacitor is connected with the feed port in the main circuit region.
11. mobile terminal as claimed in claim 10, which is characterized in that the first capacitor and the second capacitor constitute high frequency and lead to
Road, the third inductance, the 4th inductance, the 5th inductance and second capacitor constitute low frequency channel.
12. mobile terminal as claimed in claim 11, which is characterized in that the conducting wire and that the first capacitor is suspended by end
Gap between three frames and the first connector is formed, wherein the other end of the conducting wire is from second capacitor and described
The tie point of five inductance picks out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410822531.9A CN105789881B (en) | 2014-12-25 | 2014-12-25 | Mobile terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410822531.9A CN105789881B (en) | 2014-12-25 | 2014-12-25 | Mobile terminal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105789881A CN105789881A (en) | 2016-07-20 |
| CN105789881B true CN105789881B (en) | 2019-06-25 |
Family
ID=56388537
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410822531.9A Active CN105789881B (en) | 2014-12-25 | 2014-12-25 | Mobile terminal |
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| CN107732417A (en) * | 2016-08-11 | 2018-02-23 | 北京小米移动软件有限公司 | Terminal device |
| CN107887688A (en) * | 2016-09-29 | 2018-04-06 | 比亚迪股份有限公司 | Mobile terminal and its antenna assembly |
| US10403963B2 (en) * | 2017-01-19 | 2019-09-03 | Stmicroelectronics (Tours) Sas | Antenna for mobile communication device |
| CN106876990B (en) * | 2017-02-28 | 2019-03-05 | 维沃移动通信有限公司 | A kind of antenna and mobile terminal of mobile terminal |
| AU2017406139B2 (en) * | 2017-03-29 | 2020-12-24 | Honor Device Co., Ltd. | Antenna and terminal device |
| CN107039766B (en) * | 2017-04-28 | 2019-07-26 | 维沃移动通信有限公司 | A kind of antenna assembly and electronic equipment |
| CN107959106B (en) * | 2017-11-14 | 2021-12-03 | 维沃移动通信有限公司 | Antenna device and mobile terminal |
| CN109921174B (en) * | 2017-12-12 | 2022-03-22 | 深圳富泰宏精密工业有限公司 | Antenna structure and wireless communication device with same |
| CN108288767B (en) * | 2017-12-29 | 2021-06-01 | 瑞声精密制造科技(常州)有限公司 | Antenna system and mobile terminal |
| EP3767742B1 (en) * | 2018-05-08 | 2023-11-22 | Huawei Technologies Co., Ltd. | Antenna device and mobile terminal |
| CN108879074B (en) * | 2018-07-25 | 2020-12-18 | 北京小米移动软件有限公司 | Terminal shell and terminal |
| CN109659693B (en) * | 2018-12-12 | 2021-08-24 | 维沃移动通信有限公司 | Antenna structure and communication terminal |
| CN109687106A (en) * | 2018-12-24 | 2019-04-26 | 瑞声科技（南京）有限公司 | The tuning methods of antenna modules, mobile terminal and antenna modules |
| CN109830815B (en) * | 2018-12-24 | 2021-04-02 | 瑞声科技（南京）有限公司 | Antenna system and mobile terminal applying same |
| CN112952362B (en) * | 2019-12-10 | 2023-02-28 | 杭州海康威视数字技术股份有限公司 | Integrated antenna and electronic device |
| CN111029730B (en) * | 2019-12-26 | 2021-09-28 | 惠州Tcl移动通信有限公司 | Antenna structure and mobile terminal |
| CN111029725B (en) * | 2019-12-31 | 2021-09-24 | 维沃移动通信有限公司 | Electronic equipment |
| CN111180872B (en) * | 2020-02-14 | 2022-10-28 | 维沃移动通信有限公司 | Antenna device and electronic equipment |
| CN113725607A (en) * | 2020-05-25 | 2021-11-30 | Oppo广东移动通信有限公司 | Antenna device and electronic device |
| CN113871851B (en) * | 2021-08-31 | 2023-07-25 | 荣耀终端有限公司 | Mobile terminal device |
| CN114883791B (en) * | 2022-07-04 | 2022-11-25 | 荣耀终端有限公司 | Antenna system and terminal equipment |
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Also Published As
| Publication number | Publication date |
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| CN105789881A (en) | 2016-07-20 |
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