Summary of the invention
The object of the present invention is to provide a kind of novel antenna, the metalwork being configured on mobile terminal is used as a part for antenna, and by the feed placement of rational deployment antenna, thereby realize mobile terminal to broadband cover in, solved the bad problem of antenna staff (human body) performance.
In order to solve the problems of the technologies described above, the present invention is achieved by the following technical solutions:
An antenna for mobile terminal, comprises the metalwork that is arranged on mobile terminal surface, is provided with a tuning portion in described antenna, and described tuning portion is S-type or U-shaped, and the signal feed of antenna is laid by a side of mobile terminal; Described metalwork, as a part for antenna, is communicated with the tuning portion of antenna, and is communicated with the signal feed of antenna by the tuning portion of antenna; Described metalwork is away from the stratum of a side connection circuit plate of tuning portion; Described tuning portion by the sensitizing range of antenna be tuned to away from the region of mobile terminal periphery.
For the sensitizing range of antenna being adjusted to the place that staff (human body) is difficult for touching, to guarantee that mobile terminal still can keep good radio-frequency performance under hand holding state, the present invention is the zone line towards mobile terminal by the direction of routing of described antenna tuning portion, and then by the sensitizing range of antenna be tuned to the centre position of mobile terminal, be complete machine end face position relatively placed in the middle, just evaded thus staff (human body) effect.
In order to improve the high frequency bandwidth of antenna, meet the demand that mobile terminal covers wideband, in described antenna, be also provided with the parasitic branch of high frequency for extended high frequency bandwidth, the tuning portion of the parasitic branch of described high frequency and antenna is coupled.If the parasitic branch of the tuning portion of antenna and high frequency direct-coupling cannot meet the coverage requirement of mobile terminal to high frequency bandwidth, can on the basis of described tuning portion, connect again a tuning branch, utilize the parasitic branch of described tuning branch and high frequency to be coupled, to solve the defect that high frequency bandwidth is inadequate.
Preferably, the direction of routing of the parasitic branch of described high frequency is preferably towards the zone line of mobile terminal, further to optimize the radio-frequency performance of antenna under hand holding state.
Further, the parasitic branch of described high frequency is communicated with ground connection feedback point, and described ground connection feedback point is laid on circuit board, and with the combination of zones of circuit board.
Preferably, the signal feed of the preferred adjacent antenna of described ground connection feedback point is laid, and is positioned at the inner side of signal feed.
Based on the structural design of above-mentioned antenna, the invention allows for a kind of mobile terminal that adopts described Antenna Design, surface at described mobile terminal is provided with metalwork, a part using described metalwork as antenna, be communicated with the tuning portion of antenna, and be communicated with the signal feed of antenna by the tuning portion of antenna; The tuning portion of described antenna is S-type or U-shaped, and the signal feed of described antenna is laid by a side of mobile terminal; Described metalwork is away from the stratum of a side connection circuit plate of tuning portion; Regulate the cabling of antenna tuning portion, by the sensitizing range of antenna be tuned to away from the region of mobile terminal periphery, i.e. the not accessible region of staff (human body), improves staff (human body) performance of antenna thus.
Compared with prior art, advantage of the present invention and good effect are: the metalwork that antenna of the present invention is laid mobile terminal surface is used as a part for antenna, form Loop form antenna, realize the resonance of low-frequency antenna, on meeting the tuning basis of antenna low-frequency band width position, by being kept to the side, the signal feed of antenna lays, lay near a side of mobile terminal, by the tuning portion of antenna is designed to S type, or U-shaped, thereby be easy to the sensitizing range of antenna to adjust to the place that staff (human body) is difficult for touching, realize antenna sensitive spot evading staff (human body), make antenna under hand holding state, still can keep good radio-frequency performance.
Read by reference to the accompanying drawings after the detailed description of embodiment of the present invention, it is clearer that the other features and advantages of the invention will become.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in more detail.
The present invention is directed to the mobile terminal that is provided with metal ornament strip, proposed a kind of structural design of antenna.Due to the existence of metal ornament strip, cause adopting the antenna of routine techniques design, its radiance becomes very poor, almost cannot work.In order to evade the impact of metal ornament strip on antenna performance, the part of the present invention using metal ornament strip as antenna is used, and by the feed placement of rational deployment antenna on circuit board, thereby for antenna reserves the laying of enough spaces for tuning portion, thus one, not only can improve the degree of freedom of Antenna Design form, and regulate by the cabling form to antenna tuning portion, can also easily the sensitizing range of antenna be adjusted to the centre position of mobile terminal, it is the region that staff under hand holding state (human body) is difficult for touching, thereby convenient, the resonance frequency of antenna and covering bandwidth are carried out on tuning basis, effectively evade the impact of hand-held effect.
In addition, the present invention is by the parasitic branch of high frequency that design and tuning portion are coupled in antenna, demand wide-band being covered to meet mobile terminal.
Take mobile phone as described mobile terminal as example, by a specific embodiment, concrete structure design and the operation principle thereof of antenna proposed by the invention are at length set forth below.
Embodiment mono-, on current a lot of mobile phone productses, in order to pursue fashion and the aesthetics of outward appearance, often need to install bonding jumper on the surface of mobile phone and decorate, to strengthen the metal-like of mobile phone.As shown in Figure 2, at the upper surface of some phone housing, the shell edge position that is positioned at touch-screen 10 upsides and downside is separately installed with a bonding jumper 11,12, because the antenna in mobile phone is also top area or the bottom section being laid in hand set machine shell conventionally, therefore these bonding jumpers 11,12 have just been positioned at the headroom design section of antenna.Conventional Antenna Design mode is owing to cannot realizing effectively evading of 11,12 pairs of antenna empty regions of bonding jumper, therefore cause the radiation efficiency of antenna to reduce, make to be designed with the mobile phone of metal ornament strip, the radiance of its antenna is difficult to be guaranteed, especially in the time of hand-held call or hand-held upper net state, the performance of antenna can be poorer.
There is the radiation efficiency of the antenna for mobile phone of bonding jumper in order to improve such decoration, to strengthen the transmit-receive intensity of its radiofrequency signal, the scheme of the part of available technology adopting using bonding jumper as antenna, in this technical scheme, be to meet the covering of antenna to wide frequency band, the distributing point of antenna mostly adopts the design of layout placed in the middle, is laid in pcb board position placed in the middle.The antenna arrangement mode of the placed in the middle and compatible metal decoration of this distributing point, make the sensitizing range of antenna transmission signal be positioned at the place that staff (human body) easily touches, the sensitizing range of antenna is easily subject to staff (human body) impact, the performance that transmits and receives of aerial signal is affected, and then has affected the normal use of mobile terminal.
Improve staff (human body) performance of mobile phone for meeting antenna to the coverage requirement of wide frequency band when, the present embodiment has proposed a kind of technical scheme: the feed placement of rational deployment antenna, and increase by a S-type or U-shaped tuning portion, with the sensitizing range of tuned antenna easily, be located at the not accessible region of staff (human body).
Fig. 3, Fig. 5 are respectively schematic cross-section and the perspective view of the antenna that the present embodiment proposes, and suppose that bonding jumper 12 is for being laid on phone housing and being positioned at the metalwork of antenna empty regions, below unifiedly explain with metalwork 12.Described metalwork 12 is communicated with the antenna cabling 23 that is laid in interior of mobile phone, specifically, the present embodiment is provided with a tuning portion in described antenna cabling 23, for example, in Fig. 4, Fig. 5 231 sections and 232 sections, described metalwork 12 is communicated with to described tuning portion, make metalwork 12 become a part for antenna, and be communicated with by antenna cabling 23 the signal feed ⊕ being laid on circuit board 22, realize the feed-in of radiofrequency signal.A side joint ground by metalwork 12 away from antenna cabling 23, for example stratum of connection circuit plate 22, forms a loop thus.Whole loop forms the antenna of a Loop form, is responsible for the resonance of low-frequency antenna, also can produce a resonance in high-frequency band simultaneously.
For the sensitizing range of tuned antenna easily, make sensitizing range can evade the place that staff (human body) is difficult for touching, first the present embodiment changes the feed placement of antenna, by the signal feed ⊕ of the antenna layout of keeping to the side, be laid in the position near mobile phone one side on circuit board 22, as shown in Figure 3, be for example laid in the submarginal position, right side of circuit board 22.Lay by the signal feed ⊕ of antenna is kept to the side, thereby can reserve enough laying spaces for antenna cabling 23, for the design of antenna tuning portion, realize the free adjustment of tuning portion cabling form.By design tuning portion in antenna, thereby can carry out tuning optimization to the resonance location of antenna like a cork, the frequency range position needing to covering mobile phone, the ineffective activity of effectively having avoided Metal decorative part to bring Antenna Design.Meanwhile, by regulating cabling form and the direction of antenna tuning portion, thus can be easily by the sensitizing range of antenna be tuned to staff (human body) region that is difficult for touching, for example be tuned to away from the region of mobile terminal periphery, the periphery is here except comprising four of the upper and lower, left and right frame of mobile phone, also comprise the region of the upper and lower surperficial edge of mobile phone, the region that while being hand-held, staff conventionally grips, thereby the defect of the antenna form that efficiently solves this kind of compatible metal part to staff (human body) effect sensitivity.
As a kind of decision design mode of the present embodiment, can the zone line towards mobile phone, i.e. the zone line extension of walking alignment mobile phone of tuning portion by the direction of routing of the tuning portion of antenna.As shown in Figure 3, for the keep right antenna of layout of signal feed ⊕, the cabling of its tuning portion can extend to the left, thus just can by the sensitizing range of antenna be tuned to the centre position of complete machine, in the time that user's handheld mobile phone is conversed, can effectively evade staff and the impact of the number of people on aerial radiation power, guarantee that the radiance of antenna keeps good.
For the length to antenna loop realizes free adjustment, tuning with convenient antenna resonance location, the tuning portion of antenna is designed to S type or U-shaped by the present embodiment, shown in Fig. 4-Fig. 5, as 231,232 two sections of tuning portions that form a S type curve form in Fig. 4.Wherein, the cabling form of 231 sections is referring to shown in Fig. 4-1, and the cabling form of 232 sections is referring to shown in Fig. 4-2.By one end of metalwork 12, by conductor shell fragment 27,26 splicing ears 238, described conductor shell fragment 26 is electrically connected with 27.Described terminal 238 is connected to 231 sections of tuning portion, by 232 sections of 231 sections of connections, described 232 sections of splicing ears 237, connect signal feed shell fragment 25 by terminal 237, and then via the signal feed ⊕ on signal feed shell fragment 25 connecting circuit boards 22, to realize the feed-in of radiofrequency signal.Described circuit board 22 can be cell phone mainboard, can be also the antenna platelet that aims at Antenna Design.The other end of metalwork 12 is passed through to the stratum of grounding elastic part 28 connecting circuit boards 22, thus one, radiofrequency signal just can be from signal feed ⊕ via signal feed shell fragment 25 feed antennas, be connected with the tuning portion of antenna through terminal 237, then interconnected by terminal 238, conductor shell fragment 26,27 and metalwork 12, be finally connected to ground by grounding elastic part 28.This loop can be regarded a Loop antenna form as, and it can effectively cover GSM850 and GSM900 frequency range that current mobile terminal is conventional, and this loop also has resonant bandwidth at high band simultaneously.
In Fig. 3, by layout that the feed placement of antenna is kept to the side, so for playing a role, S type or U-shaped tuning portion make place mat.
The present embodiment is by the tuning portion of antenna is designed to S type or U-shaped, and these shapes not only can facilitate, effectively regulate length and the shape of antenna loop, and realization is easily tuning to low-frequency resonant frequency range, and also very useful for the optimization of high frequency bandwidth.In addition,, just because of the existence of tuning portion, the radiance of guarantee mobile phone antenna under hand holding state is good.Trace it to its cause and be, from the signal feed-in terminal separated 237 of antenna to metalwork 12, antenna need to be through 232 and 231 two sections, the sensitizing range layout of antenna can be arrived to the centre position of complete machine end face by this part, also be the user region that staff (human body) is difficult for touching while using, thereby keep under hand holding state mobile phone radio-frequency performance good.
Because the antenna structure of this Loop form is limited to the tuning capability of high frequency bandwidth, can not make antenna cover wider frequency range at high band, therefore, in order further to optimize the high frequency bandwidth of antenna, to meet the coverage requirement of mobile phone high band bandwidth, the present embodiment preferably further designs the parasitic branch 235 of high frequency in described antenna, referring to Fig. 4, shown in Fig. 5, connect grounding elastic part 24 by terminal 236, and then be laid in the ground connection feedback point on circuit board 22 by grounding elastic part 24 connections, the combination of zones with circuit board 22 is put in described ground connection feedback, in conjunction with Fig. 3, shown in Fig. 5, make thus the ground of metalwork 12 communicate with the ground of the parasitic branch 235 of high frequency.Utilize the coupling of the parasitic branch 235 of high frequency and antenna tuning portion, can realize the effective expansion to antenna high frequency bandwidth, and then solve the inadequate defect of Loop antenna form high frequency bandwidth.
The present embodiment is designed to parasitic high frequency branch 235 to be applicable to and the shape of antenna tuning portion coupling, by coupling, the high frequency bandwidth of mobile phone is optimized, and makes antenna can cover DCS1800, PCS1990, WCDMA B1, B2, B3, B5, the frequency ranges such as B8.
In the time that the parasitic branch 235 of design high frequency is coupled with the tuning portion of antenna, can be first effectively evade requirement according to antenna in the required resonance location of low-frequency range and sensitizing range, adjust the cabling form of antenna tuning portion, form S type or U-shaped, as the primary path part of tuning portion.Then, the parasitic branch 235 of design high frequency, is coupled the primary path part of itself and tuning portion.If the primary path part after cabling form is determined and the parasitic branch of described high frequency 235 direct-couplings, can meet the coverage requirement of antenna to high frequency bandwidth, only design described primary path part in the tuning portion of antenna; If the primary path part after cabling form is determined is direct and the parasitic branch 235 of high frequency is coupled, cannot meet the coverage requirement of antenna to high frequency bandwidth, in the time of the tuning portion of designing antenna, can on the basis of described primary path part, further design again a tuning branch 234, its shape is as shown in Fig. 4-3, with 231 sections and 232 sections link together, shown in Figure 4.Utilize the parasitic branch 235 of described tuning branch 234 and high frequency to be coupled, effectively to realize the covering of bandwidth.
As a kind of preferred design of the present embodiment, the direction of routing of the parasitic branch 235 of described high frequency is the preferred zone line towards mobile terminal also, the signal feed of the preferred adjacent antenna of ground connection feedback point of its connection is laid, and be positioned at the inner side of signal feed, further to optimize the radio-frequency performance of antenna under hand holding state.
In the present embodiment, the stratum of circuit board 22 can with the main reference of the main ground of PCB or complete machine be connected; Shell fragment 24,25,26,27,28 also can adopt Pogo Pin etc. can realize the interconnected device of electricity and realize being communicated with of antenna cabling 23 and circuit board 22, and the present embodiment is not limited in above giving an example.
Fig. 6 is the return loss plot figure of the designed antenna of the present embodiment, be can clearly be seen that by Fig. 6: the covering in a big way of the designed antenna of the present embodiment low frequency frequency range and high-frequency band, effectively expanded the working frequency range of mobile phone.
In the present embodiment, the parasitic branch 235 of the tuning portion 231,232,234 of described antenna and high frequency, can design on hand set machine shell, also can be made in above support, certainly, also can adopt stamping technology to be directly embedded on the medial surface of hand set machine shell, the present embodiment does not specifically limit this.
The present embodiment is by being combined the metal ornament strip on mobile phone with antenna for mobile phone, realize the good compatibility between the two, by the feed placement of antenna is rationally set, and the tuning portion of designing antenna and the parasitic branch of high frequency, thereby realizing the impact of having avoided hand-held effect in wideband covers, guarantee the radiance of antenna.
The Antenna Construction Design of the present embodiment, solve conflicting of producing between metal finishing that current high-end mobile phone pursues and Antenna Design principle, can be widely used in mobile phone, panel computer etc. has outward appearance in the mobile terminal product of specific (special) requirements, to meet the designing requirement of this series products to fashion outward appearance.
Finally it should be noted that: above embodiment only, in order to technical scheme of the present invention to be described, is not intended to limit; Although the present invention is had been described in detail with reference to previous embodiment, those of ordinary skill in the art is to be understood that: its technical scheme that still can record aforementioned each embodiment is modified, or part technical characterictic is wherein equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.