CN203644934U - Antenna device - Google Patents
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- CN203644934U CN203644934U CN201320828685.XU CN201320828685U CN203644934U CN 203644934 U CN203644934 U CN 203644934U CN 201320828685 U CN201320828685 U CN 201320828685U CN 203644934 U CN203644934 U CN 203644934U
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- PEZNEXFPRSOYPL-UHFFFAOYSA-N (bis(trifluoroacetoxy)iodo)benzene Chemical compound FC(F)(F)C(=O)OI(OC(=O)C(F)(F)F)C1=CC=CC=C1 PEZNEXFPRSOYPL-UHFFFAOYSA-N 0.000 claims 1
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- 238000004891 communication Methods 0.000 abstract description 12
- 230000008878 coupling Effects 0.000 abstract description 3
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- 230000009286 beneficial effect Effects 0.000 abstract description 2
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- 230000005855 radiation Effects 0.000 description 12
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- 230000001965 increasing effect Effects 0.000 description 6
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- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
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- 208000007443 Neurasthenia Diseases 0.000 description 1
- 206010003549 asthenia Diseases 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
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- 230000005670 electromagnetic radiation Effects 0.000 description 1
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Abstract
The utility model discloses an antenna device used for reducing the specific absorption rate value in a specific frequency band, and belongs to the field of wireless communication. The antenna device comprises a printed circuit board and antenna parts, the antenna parts comprise an antenna oscillator and a feeding point, the antenna oscillator is connected with the printed circuit board via the feeding point, a layer ground of the printed circuit board is provided with a utility structure playing a role of a slot antenna, the utility structure is used for coupling the current of the antenna oscillator, and the utility structure and the antenna parts are positioned at the same side of the feeding point of the printed circuit board. The beneficial effects of the antenna device are that the printed circuit board is provided with the utility structure, the current of the antenna is coupled to the utility structure so that the current of the antenna is decreased, energy hot spots on the mainboard is dispersed in a balanced manner, the SAR value is reduced, the wireless communication is prevented from interferences, the production cost is low, and the layout of the printed circuit board is compact.
Description
Technical field
The utility model relates to wireless communication field, relates in particular to a kind of antenna assembly.
Background technology
Along with fast development and the extensive use of wireless technology, make people can obtain reliable data communication services whenever and wherever possible, bring great convenience to work and life.Wireless technology, in offering convenience, has also produced some problems, such as the radiation problem producing due to wireless technology.The research of international medical community has just proved that the radiation meeting of wireless terminal causes neurasthenia failure of memory, even may cause multiple serious disease.Therefore, on the one hand, people are putting forth effort to improve received signal strength and the quality of mobile terminal, on the other hand, are also being concerned about that mobile terminal is to the electromagnetic harm of human body radiation.
SAR(Specific Absoption Rate) value is specific absorption rate, refers in the organism unit interval, the electromagnetic radiation energy that unit mass absorbed or consumed, unit is W/Kg or mW/g.The test of SAR value is the wireless electromagnetic wave energy being produced by mobile terminal of measuring absorption of human body by testing equipment.SAR value is less, represents that the amount that emittance is absorbed by the body is fewer.At present, increasing market and operation commercial city have proposed requirement to the SAR value of mobile terminal, and a lot of mobile terminals all must meet the requirement of SAR, and the design aspect of antenna also needs to pay close attention to more the index of SAR.
In the prior art, the antenna assembly of common mobile terminal is all to reduce SAR value by reducing radiant power conventionally.Implementation method comprises reducing linear heat generation rate, reduces the radiation efficiency of antenna by debugging antenna or antenna match, or adds absorbing material (its essence is also to reduce the radiant power of antenna) etc.These method Shortcomings parts.Reason is all will reduce SAR value taking the radiance of sacrifice antenna as cost, thereby often can not meet the requirement that ensures aerial radiation power and reduce SAR value simultaneously.
License notification number is: CN202406152U, a kind of mobile phone of the SAR of reduction value is disclosed, comprise the components and parts of pcb board, antenna and antenna periphery, the components and parts of antenna and antenna periphery are welded on pcb board, wherein, on pcb board, be also provided with the suction ripple paster for reducing SAR value, inhale ripple paster and stick between antenna and antenna periphery components and parts, by antenna and the isolation of antenna periphery components and parts.This patent, by increasing and inhale ripple paster at antenna periphery, has reduced the SAR value of mobile phone, thereby has reduced the radiation of mobile phone to human body, has reduced the incidence of disease inducing an illness because of mobile phone radiation.Although above-mentioned disclosed patented technology scheme, can reduce the SAR value of wireless terminal by absorbing material, reduced radiation, but this absorbing material also can absorb the normal communications signal that antenna outwards sends with electromagnetic wave form simultaneously, disturbs normal data communication.In addition, this absorbing material is often expensive, is unfavorable for the cost control of product.
Utility model content
For above-described technical problem, the utility model provides a kind of antenna assembly, in effectively reducing antenna assembly SAR value, and the radiant power that can not lose antenna, the communication quality of maintenance wireless terminal device.
Concrete technical scheme is as follows:
A kind of antenna assembly, for reducing the specific absorption rate value under predetermined band, wherein,
Comprise pcb board, antenna element;
Described antenna element comprises antenna oscillator, distributing point; Described antenna oscillator is connected with described pcb board by described distributing point;
The layer of described pcb board is provided with the effectiveness structure that plays slot antenna effect on the ground, the electric current of described effectiveness structure for being coupled on described antenna oscillator;
Described effectiveness structure and described antenna element are positioned at the homonymy of distributing point on described pcb board.
Preferably, described effectiveness structure plays slot antenna and does the used time, the length of corresponding slot antenna oscillator be under described predetermined band resonance wavelength 1/4th.
Preferably, the minimum distance of described effectiveness structure and described distributing point is less than 1/4th of resonance wavelength under described predetermined band.
Preferably, described effectiveness structure is arranged on the position apart from described pcb board edge with preset distance.
Preferably, described antenna element is monopole antenna or PIFA antenna or IFA antenna oscillator or loop antenna.
Preferably, the sideline of described effectiveness structure is parallel to the long limit of described pcb board.
Preferably, described effectiveness structure is blind hole or the through hole on the ground in the layer of described pcb board with preset shape.
Preferably, the scope of described predetermined band is that 1850MHz is to 1910MHz.
Preferably, the preset shape of described effectiveness structure is square.
Preferably, when described pcb board is individual layer earth formation or multilayer earth formation; Described effectiveness structure is located at described pcb board stratum, forms blind hole.
Preferably, described pcb board comprises multilayer earth formation; Described effectiveness structure runs through described pcb board and forms through hole.
The beneficial effects of the utility model are:
The utility model by arranging effectiveness structure on PCB mainboard, by the current coupling on antenna on this effectiveness structure, thereby weaken the electric current on antenna, make the energy focus on this mainboard be dispersed equilibrium, thereby can reach the effect that reduces SAR value, and can radio communication not produced and be disturbed.The advantages such as meanwhile, it is low that the utility model also has production cost, pcb board compact in design.
Brief description of the drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only embodiment more of the present utility model, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the structural representation of the embodiment of a kind of antenna assembly of the utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail, but not as restriction of the present utility model.
The utility model discloses a kind of antenna assembly, for reducing the specific absorption rate value under predetermined band.In a kind of specific embodiment, above-mentioned predetermined work band limits is that 1850MHz is to 1910MHz.Fig. 1 is the structural representation of a kind of embodiment of a kind of antenna assembly of the utility model.Wherein, comprise pcb board 1, and antenna element.In a kind of embodiment, antenna element comprises antenna oscillator 2, distributing point 3.As shown in Figure 1, the antenna oscillator 2 that pcb board 1 connects by distributing point 3, distributing point 3 is for carrying out feed to antenna oscillator 2.Also comprise the effectiveness structure 4 being arranged on pcb board 1.Effectiveness structure 4 is arranged on the layer ground of pcb board 1, plays the effect of slot antenna.Therefore, effectiveness structure 4 can be used in the electric current on coupled antenna oscillator 2; Effectiveness structure 4 and antenna oscillator 2 are positioned at the homonymy of distributing point 3 on pcb board 1.Effectiveness structure 4 is for having the structure of preset shape.
Know-why of the present utility model is: on pcb board 1, increase effectiveness structure 4, play the effect of slot antenna by effectiveness structure 4, this effectiveness structure 4 that plays slot antenna effect can coupled antenna oscillator 2 on the part of high electric current, thereby weakened the electric current on antenna oscillator 2.On the other hand, because effectiveness structure 4 has certain shape and area, therefore just the electric current on pcb board 1 can be dispersed in to the edge of effectiveness structure 4, to reach the object that weakens electric current on pcb board 1, thereby make the technical program can play from two above-mentioned aspects the effect that reduces SAR value.On the contrary, if there is no effectiveness structure 4 on mainboard, so most electric currents all can be on antenna oscillator 2 and pcb board 1, causes the energy focus on pcb board 1 too concentrate and produce compared with large radiation amount.Because SAR value is the energy absorption near field, and the radiation efficiency of antenna is the emittance index in far field, thereby can, in effectively reducing SAR value, also not affect the radiation efficiency of antenna by the Energy distribution on Design PCB plate 1.
In a kind of embodiment, be positioned at the effectiveness structure 4 of the slot antenna effect of playing on pcb board 1, it is upper and lower that the length of its corresponding slot antenna oscillator can be made as about quarter-wave, to reach the object of electric current on coupled antenna oscillator 2.According to formula
known, be located in vacuum environment, taking frequency as 2GHz, the wavelength of this operating frequency is roughly slightly less than
.Its resonance wave wavelength of 1/4th is 37.5mm like this.When the quarter-wave of vacuum is 37.5mm, the quarter-wave in medium can be less than 37.5mm.Therefore consider the impact that has medium on pcb board 1, one preferably execution mode is, can play slot antenna in effectiveness structure 4 and do the used time, the length of corresponding slot antenna oscillator be with predetermined band under on the basis of 1/4th these conditions of resonance wavelength, suitably adjust the size of effectiveness structure 4, make it do the used time playing slot antenna, the length of corresponding slot antenna oscillator is slightly less than 1/4th of resonance wavelength under predetermined band, thereby can play better the effect of couple current.
In another kind of embodiment, the sideline of playing the effectiveness structure 4 of slot antenna effect can be set to be parallel to the long limit of pcb board 1.Its reason is, electric current can send from the distributing point 3 of antenna oscillator 2 on mainboard, and along pcb board 1 forward impelling abreast, wherein most of electric current can move along the direction that is parallel to pcb board 1 long limit.Therefore the sideline of effectiveness structure 4 is set to be parallel to the long limit of pcb board 1, just can utilize the sideline of effectiveness structure 4 effectively most of electric current to be dispersed in to its edge, improves the effect of energy focus on balanced pcb board 1.Therefore preferred embodiment, effectiveness structure 4 is square to one.Its reason is, when effectiveness structure 4 is square, its semi-perimeter is in 1/4th left and right of work resonance wavelength, and same girth, foursquare area is minimum, can reduce the impact on whole PCB version layout that arranges due to effectiveness structure 4.Meanwhile, foursquare sideline is parallel to the long limit of pcb board 1, can effectively disperse the electric current in pcb board 1, makes the energy focus distributed equalization on pcb board 1.Therefore, in the above-described embodiment, in the time that the corresponding wavelength of frequency is 150mm, can be by the square-shaped patterns that is set to 15mm*15mm of effectiveness structure 4, the size of this effectiveness structure 4 is 15mm+15mm=30mm(because slot antenna is generally strip, and therefore its size is generally thought of as long limit+minor face sum, herein for getting the equal situation in both sides), effectiveness structure 4 is done the used time playing slot antenna like this, and the length of corresponding slot antenna oscillator is less than 37.5mm.
In a kind of embodiment of the present utility model, effectiveness structure 4 is arranged on distance P CB plate 1 edge and has the position of predeterminable range.As shown in Figure 1, effectiveness structure 4 is d with the distance at pcb board 1 edge
2.Specifically, d
2can be chosen as 5mm or other length.Should be appreciated that, such length setting can be by those skilled in the art according to actual demand, and as the format layout to pcb board 1 is carried out adjusted design, the concrete length that therefore this place exemplifies is not as to restriction of the present utility model.The object arranging is like this in order to make effectiveness structure 4 be unlikely to the too edge near pcb board 1.Because if distance is between the two too small, can make the energy focus on pcb board 1 too concentrate on narrow like this region, cause amount of radiation to rise.
In a kind of embodiment of the present utility model, the minimum distance of effectiveness structure 4 and distributing point 3 is less than the quarter-wave of resonance wavelength under predetermined band.As shown in Figure 1, i.e. d
1should be less than the quarter-wave of resonance wavelength.Its reason is, under normal circumstances, distributing point 3 places are positions of pcb board 1 electric current maximum.And after 1/4th resonance wavelength distances through under operating frequency, the intensity of electric current can weaken very soon, if therefore effectiveness structure 4 is arranged on away from apart from outside the quarter-wave distance of resonance, the effect of the energy focus on the dispersion pcb board 1 that effectiveness structure 4 plays will be relatively little.So effectiveness structure 4 is from the distance d of antenna feed point 3
1be less than 1/4th resonance wavelengths.Like this, effectiveness structure 4 just can very effectively play the effect of the electric current that weakens antenna 2 and mainboard 1.
In a kind of embodiment of the present utility model, antenna oscillator 2 can be monopole antenna or planar inverted-F antenna (PIFA) or IFA antenna or loop antenna etc.
In a kind of specific embodiment of the present utility model, in the time that pcb board 1 is single layer structure, can described effectiveness structure 4 be set on the ground at the layer of pcb board 1.Also effectiveness structure 4 places of lamina can be hollowed out, on pcb board 1, form through hole, to strengthen the effect of distributed equalization energy focus of effectiveness structure 4.
In another kind of specific embodiment of the present utility model, in the time that pcb board 1 is sandwich construction, for example general multi-layer sheet has 4 layers of ground or 8 layers of ground, can effectiveness structure 4 be set on the ground in the multilayer of pcb board 1.This is because the electric current in pcb board 1 flows in multilayer ground, and therefore pcb board 1 need to arrange above-mentioned effectiveness structure 4, the effect disperseing to reach distributed equalization energy focus on the ground at each layer.All layers ground that also can directly effectiveness structure 4 be run through to pcb board 1 forms through hole on pcb board 1, and the position at pcb board 1 the above effectiveness structure 4 place is emptied completely, reaches the effect of dispersion and balanced energy focus.
According to above-described embodiment of the present utility model, test the antenna performance contrast of pcb board after there is no effectiveness structure and increasing effectiveness structure, and specifically illustrated reduced parameter in following list, comprise antenna communication quality index and SAR value.Wherein, table 1 shows the antenna performance of pcb board in the time not increasing effectiveness structure, and table 2 shows the antenna performance of pcb board after having increased effectiveness structure.
Table 1
Table 2
From the Data Comparison of table 1 and table 2, increased effectiveness structure on pcb board after, PCS(Personal Communications Services) in 512 channels under high-frequency band, SAR value drops to 0.82mw/g from 1.16mW/g, has declined nearly 30%.And the radiant power performance (TRP) of free space does not reduce simultaneously, under right head status, TRP performance also increases.Visible, a kind of antenna assembly of the present utility model has in not reducing communication quality, reduces the effect of SAR value.
The utility model by arranging effectiveness structure on PCB mainboard, thereby the current coupling on antenna, on this effectiveness structure, is weakened to the electric current on antenna, made the energy focus distributed equalization on this mainboard, thereby reach the effect that reduces SAR value, and can radio communication not produced and be disturbed.Meanwhile, the utility model also has advantages of that production cost is low, in addition, because be directly carries out the setting of effectiveness structure on pcb board, need on pcb board, not increase extra parts setting, and therefore compact in design has been saved the inner space of antenna assembly.A kind of antenna assembly of the present utility model, has application prospect comparatively widely.
The foregoing is only the utility model preferred embodiment; not thereby limit execution mode of the present utility model and protection range; to those skilled in the art; the scheme that being equal to of should recognizing that all utilization the utility model specifications and diagramatic content done replaces and apparent variation obtains, all should be included in protection range of the present utility model.
Claims (11)
1. an antenna assembly, for reducing the specific absorption rate value under predetermined band, is characterized in that, comprises pcb board, antenna element;
Described antenna element comprises antenna oscillator, distributing point; Described antenna oscillator is connected with described pcb board by described distributing point;
The layer of described pcb board is provided with the effectiveness structure that plays slot antenna effect on the ground, the electric current of described effectiveness structure for being coupled on described antenna oscillator;
Described effectiveness structure and described antenna element are positioned at the homonymy of distributing point on described pcb board.
2. antenna assembly as claimed in claim 1, is characterized in that,
Described effectiveness structure plays slot antenna and does the used time, the length of corresponding slot antenna oscillator be under described predetermined band resonance wavelength 1/4th.
3. antenna assembly as claimed in claim 1, is characterized in that,
The minimum distance of described effectiveness structure and described distributing point is less than 1/4th of resonance wavelength under described predetermined band.
4. antenna assembly as claimed in claim 1, is characterized in that,
Described effectiveness structure is arranged on the position apart from described pcb board edge with preset distance.
5. antenna assembly as claimed in claim 1, is characterized in that,
Described antenna element is monopole antenna or PIFA antenna or IFA antenna oscillator or loop antenna.
6. antenna assembly as claimed in claim 1, is characterized in that,
The sideline of described effectiveness structure is parallel to the long limit of described pcb board.
7. antenna assembly as claimed in claim 1, is characterized in that, described effectiveness structure is blind hole or the through hole on the ground in the layer of described pcb board with preset shape.
8. antenna assembly as claimed in claim 1, is characterized in that, the scope of described predetermined band is that 1850MHz is to 1910MHz.
9. antenna assembly as claimed in claim 7, is characterized in that, the preset shape of described effectiveness structure is square.
10. antenna assembly as claimed in claim 7, is characterized in that,
When described pcb board is individual layer earth formation or multilayer earth formation;
Described effectiveness structure is located at described pcb board stratum, forms blind hole.
11. antenna assemblies as claimed in claim 7, is characterized in that,
Described pcb board comprises multilayer earth formation;
Described effectiveness structure runs through described pcb board and forms through hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320828685.XU CN203644934U (en) | 2013-12-13 | 2013-12-13 | Antenna device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320828685.XU CN203644934U (en) | 2013-12-13 | 2013-12-13 | Antenna device |
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| Publication Number | Publication Date |
|---|---|
| CN203644934U true CN203644934U (en) | 2014-06-11 |
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ID=50876157
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320828685.XU Expired - Lifetime CN203644934U (en) | 2013-12-13 | 2013-12-13 | Antenna device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104716416A (en) * | 2013-12-13 | 2015-06-17 | 展讯通信（上海）有限公司 | Antenna device |
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2013
- 2013-12-13 CN CN201320828685.XU patent/CN203644934U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104716416A (en) * | 2013-12-13 | 2015-06-17 | 展讯通信（上海）有限公司 | Antenna device |
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Granted publication date: 20140611 |
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