CN104716416A - Antenna device - Google Patents
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- CN104716416A CN104716416A CN201310687383.XA CN201310687383A CN104716416A CN 104716416 A CN104716416 A CN 104716416A CN 201310687383 A CN201310687383 A CN 201310687383A CN 104716416 A CN104716416 A CN 104716416A
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Abstract
The invention discloses an antenna device and belongs to the field of wireless communication. The antenna device is used for reducing a specific absorption rate value under a specific frequency band and comprises a PCB and an antenna assembly, wherein the antenna assembly comprises an antenna element and a feeding point; the antenna element is connected with the PCB through the feeding point; the layer ground of the PCB is provided with a utility structure for playing the function of a slot antenna and being coupled with current on the antenna element; the utility structure and the antenna assembly are located on the same side of the feeding point on the PCB. The antenna device has the advantages that the utility structure is arranged on the PCB, the current on the antenna is coupled to the utility structure, current on the antenna is weakened, energy hot points on a mainboard are distributed in a balanced mode, and therefore the effect of reducing the SAR value is achieved, and no interference is generated on wireless communication. The antenna device has the advantages that the production cost is low and the layout of the PCB is compact.
Description
Technical field
The present invention relates to wireless communication field, particularly relate 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, while offering convenience, also creates some problems, such as due to the radiation problem of wireless technology generation.The radiation that the research of international medical community just demonstrates wireless terminal can cause neurasthenia failure of memory, even may cause multiple serious disease.Therefore, on the one hand, people are putting forth effort the received signal strength and the quality that improve 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 and specific absorption rate, refer in the organism unit interval, the electromagnetic radiation energy that unit mass absorbed or consumed, unit is W/Kg or mW/g.SAR value test is the wireless electromagnetic wave energy produced by mobile terminal being measured absorption of human body by testing equipment.SAR value is less, represents the amount that emittance is absorbed by the body fewer.At present, increasing market and the operation commercial city SAR value to mobile terminal proposes requirement, and a lot of mobile terminal all must meet the requirement of SAR, and the design aspect of antenna also needs the index paying close attention to SAR more.
In the prior art, the antenna assembly of common mobile terminal is all by reducing radiant power to reduce SAR value usually.Implementation method comprises reduction linear heat generation rate, is reduced the radiation efficiency of antenna by debugging antenna or antenna match, or adds absorbing material (its essence is also reduce the radiant power of antenna) etc.These method Shortcomings parts.Reason is all to sacrifice the radiance of antenna for cost is to reduce SAR value, thus often will to meet the requirement ensureing antenna radiated power and reduce SAR value simultaneously.
License notification number is: CN202406152U, disclose a kind of mobile phone reducing SAR value, 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, pcb board is also provided with the suction ripple paster for reducing SAR value, inhales 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 inhales ripple paster by increasing at antenna periphery, reduces the SAR value of mobile phone, thus reduces the radiation of mobile phone to human body, decrease the incidence of disease because mobile phone radiation induces an illness.Although above-mentioned disclosed art solutions, the SAR value of wireless terminal can be reduced by absorbing material, decrease radiation, but this absorbing material also can absorb the normal communications signal that antenna outwards sends with electromagnetic wave simultaneously, disturbs normal data communication.In addition, this absorbing material is often expensive, is unfavorable for the cost control of product.
Summary of the invention
For above-described technical problem, the invention provides a kind of antenna assembly, while effectively reducing antenna assembly SAR value, the radiant power of antenna can not be lost, keep the communication quality of 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 utility structure playing slot antenna effect, the electric current of described utility structure on the described antenna oscillator that is coupled on the ground;
Described utility structure and described antenna element are positioned at the homonymy of distributing point on described pcb board.
Preferably, when described utility structure plays slot antenna effect, the length of corresponding slot antenna oscillator is 1/4th of resonance wavelength under described predetermined band.
Preferably, the minimum distance of described utility structure and described distributing point is less than 1/4th of resonance wavelength under described predetermined band.
Preferably, described utility 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 utility structure is parallel to the long limit of described pcb board.
Preferably, described utility structure is blind hole or the through hole in the layer ground of described pcb board with preset shape.
Preferably, the scope of described predetermined band is 1850MHz to 1910MHz.
Preferably, the preset shape of described utility structure is square.
Preferably, described pcb board be individual layer earth formation or multilayer formation structure time; Described utility structure is located at described pcb board stratum, forms blind hole.
Preferably, described pcb board comprises multilayer formation structure; Described utility structure runs through described pcb board and forms through hole.
The invention has the beneficial effects as follows:
The present invention by arranging utility structure on PCB mainboard, by the current coupling on antenna on this utility structure, thus reduce the electric current on antenna, make energy hotspot on this mainboard by distributed equalization, thus can reach the effect reducing SAR value, and interference can not be produced to radio communication.Meanwhile, the advantages such as it is low that the present invention also has production cost, pcb board compact in design.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of the embodiment of a kind of antenna assembly of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described, but not as limiting to the invention.
The invention 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 1850MHz to 1910MHz.Fig. 1 is the structural representation of a kind of embodiment of a kind of antenna assembly of the present invention.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 is connected by distributing point 3, distributing point 3 is for carrying out feed to antenna oscillator 2.Also comprise the utility structure 4 be arranged on pcb board 1.Utility structure 4 is arranged on the layer of pcb board 1 on the ground, plays the effect of slot antenna.Therefore, utility structure 4 can be used in the electric current on coupled antenna oscillator 2; Utility structure 4 and antenna oscillator 2 are positioned at the homonymy of distributing point 3 on pcb board 1.Utility structure 4 is for having the structure of preset shape.
Know-why of the present invention is: on pcb board 1, increase utility structure 4, the effect of slot antenna is played by utility structure 4, this utility structure 4 playing slot antenna effect can the part of high electric current on coupled antenna oscillator 2, thus reduces the electric current on antenna oscillator 2.On the other hand, because utility structure 4 has certain shape and area, therefore just can, by the edge of the current dissipation on pcb board 1 at utility structure 4, to reach the object weakening electric current on pcb board 1, thus the technical program be made can to play the effect reducing SAR value from above-mentioned two aspects.On the contrary, if mainboard does not have utility structure 4, so most current all can, on antenna oscillator 2 and pcb board 1, cause the energy hotspot on pcb board 1 too concentrate and produce comparatively large radiation amount.Due to the energy absorption that SAR value is near field, and the radiation efficiency of antenna is the emittance index in far field, thus while effectively reducing SAR value, also can 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 utility structure 4 playing slot antenna effect on pcb board 1, it is upper and lower that the length of the slot antenna oscillator corresponding to it can be set to about quarter-wave, to reach the object of electric current on coupled antenna oscillator 2.According to formula
known, being located in vacuum environment, take frequency as 2GHz, and the wavelength of this operating frequency is roughly slightly less than
rice=0.15 meter=150mm.Its resonance wave wavelength of 1/4th is 37.5mm like this.When the quarter-wave of vacuum is 37.5mm, quarter-wave in media as well can be less than 37.5mm.Therefore impact pcb board 1 having medium is considered, one preferably execution mode is, can when utility structure 4 plays slot antenna effect, the length of corresponding slot antenna oscillator is with on the basis of 1/4th these conditions of resonance wavelength under predetermined band, the size of suitable adjustment utility structure 4, make it when playing slot antenna effect, the length of corresponding slot antenna oscillator is slightly less than 1/4th of resonance wavelength under predetermined band, thus can play the effect of couple current better.
In another kind of embodiment, the sideline of playing the utility structure 4 of slot antenna effect can be set to the long limit being parallel to 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 being parallel to the long limit of pcb board 1.Therefore the sideline of utility structure 4 is set to the long limit being parallel to pcb board 1, just can utilize the sideline of utility structure 4 effectively by most of current dissipation at its edge, improve the effect of energy hotspot on balanced pcb board 1.Therefore one preferred embodiment, and utility structure 4 is square.Its reason is, when utility structure 4 is square, its semi-perimeter is about 1/4th of operational resonant wavelength, and same girth, foursquare area is minimum, can reduce the impact arranged whole PCB version layout due to utility structure 4.Meanwhile, foursquare sideline is parallel to the long limit of pcb board 1, effectively can disperse the electric current in pcb board 1, makes the energy hotspot distributed equalization on pcb board 1.Therefore, in the above-described embodiment, when the wavelength corresponding to frequency is 150mm, can by the square-shaped patterns being set to 15mm*15mm of utility structure 4, the size of this utility structure 4 is 15mm+15mm=30mm(due to slot antenna and 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), such utility structure 4 is when playing slot antenna effect, and the length of corresponding slot antenna oscillator is less than 37.5mm.
In a kind of embodiment of the present invention, utility structure 4 is arranged on the position that distance pcb board 1 edge has predeterminable range.As shown in Figure 1, utility structure 4 is d2 with the distance at pcb board 1 edge.Specifically, d2 can be chosen as 5mm or other length.It is to be appreciated that such length arrange can by the demand of those skilled in the art according to reality, as carried out adjusted design to the format layout of pcb board 1, therefore the concrete length that exemplifies of this place is not as a limitation of the invention.The object of such setting is to make utility structure 4 be unlikely to too near the edge of pcb board 1.Because if distance is between the two too small, the energy hotspot on pcb board 1 can be made too to concentrate on region narrow like this, cause amount of radiation to rise.
In a kind of embodiment of the present invention, utility structure 4 and the minimum distance of distributing point 3 are less than the quarter-wave of resonance wavelength under predetermined band.As shown in Figure 1, namely d1 should be less than the quarter-wave of resonance wavelength.Its reason is, under normal circumstances, distributing point 3 place is the maximum position of pcb board 1 electric current.And in 1/4th resonance wavelength distances under operating frequency afterwards, the intensity of electric current can weaken very soon, if be therefore arranged on by utility structure 4 away from outside the quarter-wave distance of distance resonance, the effect of the energy hotspot on the dispersion pcb board 1 that utility structure 4 plays will be relatively little.So utility structure 4 is less than 1/4th resonance wavelengths from the distance d1 of antenna feed point 3.Like this, utility structure 4 just very effectively can play the effect of the electric current weakening antenna 2 and mainboard 1.
In a kind of embodiment of the present invention, 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 invention, when pcb board 1 is single layer structure, at the layer of pcb board 1, described utility structure 4 can be set on the ground.Also utility structure 4 place of lamina can be hollowed out, on pcb board 1, form through hole, to strengthen the effect of the distributed equalization energy hotspot of utility structure 4.
In another kind of specific embodiment of the present invention, when pcb board 1 is sandwich construction, such as general multi-layer sheet has 4 layers of ground or 8 layers of ground, can arrange utility structure 4 on the ground in the multilayer of pcb board 1.This is because the electric current in pcb board 1 flows in multilayer ground, therefore pcb board 1 needs to arrange above-mentioned utility structure 4 on the ground at each layer, to reach the effect of distributed equalization energy hotspot dispersion.Also directly utility structure 4 can be run through all layer ground of pcb board 1, on pcb board 1, form through hole, namely on pcb board 1, the position at described utility structure 4 place is emptied completely, reaches the effect of dispersion and balanced energy focus.
According to the abovementioned embodiments of the present invention, test pcb board there is no utility structure and increase the antenna performance contrast after utility structure, and particularly illustrate reduced parameter in following list, comprise antenna communication quality index and SAR value.Wherein, table 1 shows the antenna performance of pcb board when not increasing utility structure, and table 2 shows the antenna performance of pcb board after adding utility structure.
Table 1
Table 2
From the Data Comparison of table 1 and table 2, after pcb board adds utility structure, PCS(Personal Communications Services) in 512 channels under high-frequency band, SAR value drops to 0.82mw/g from 1.16mW/g, have dropped 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 invention has while not reducing communication quality, reduces the effect of SAR value.
The present invention by arranging utility structure on PCB mainboard, thus by the current coupling on antenna on this utility structure, reduce the electric current on antenna, make the energy hotspot distributed equalization on this mainboard, thus reach the effect reducing SAR value, and interference can not be produced to radio communication.Meanwhile, the present invention also has the low advantage of production cost, and in addition, owing to being directly carry out utility structure setting on pcb board, need not increase extra parts and arrange on pcb board, therefore compact in design, saves the inner space of antenna assembly.A kind of antenna assembly of the present invention, has application prospect comparatively widely.
The foregoing is only preferred embodiment of the present invention; not thereby embodiments of the present invention and protection range is limited; to those skilled in the art; should recognize and all should be included in the scheme that equivalent replacement done by all utilizations specification of the present invention and diagramatic content and apparent change obtain in protection scope of the present invention.
Claims (11)
1. an antenna assembly, for reducing the specific absorption rate value under predetermined band, is characterized in that,
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 utility structure playing slot antenna effect, the electric current of described utility structure on the described antenna oscillator that is coupled on the ground;
Described utility 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,
When described utility structure plays slot antenna effect, the length of corresponding slot antenna oscillator is 1/4th of resonance wavelength under described predetermined band.
3. antenna assembly as claimed in claim 1, is characterized in that,
The minimum distance of described utility 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 utility 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 utility structure is parallel to the long limit of described pcb board.
7. antenna assembly as claimed in claim 1, is characterized in that, described utility structure is blind hole or the through hole in the layer ground of described pcb board with preset shape.
8. antenna assembly as claimed in claim 1, it is characterized in that, the scope of described predetermined band is 1850MHz to 1910MHz.
9. antenna assembly as claimed in claim 7, is characterized in that, the preset shape of described utility structure is square.
10. antenna assembly as claimed in claim 7, is characterized in that,
Described pcb board be individual layer earth formation or multilayer formation structure time;
Described utility 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 formation structure;
Described utility structure runs through described pcb board and forms through hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310687383.XA CN104716416A (en) | 2013-12-13 | 2013-12-13 | Antenna device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310687383.XA CN104716416A (en) | 2013-12-13 | 2013-12-13 | Antenna device |
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| CN104716416A true CN104716416A (en) | 2015-06-17 |
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| CN201310687383.XA Pending CN104716416A (en) | 2013-12-13 | 2013-12-13 | Antenna device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112542678A (en) * | 2020-11-30 | 2021-03-23 | Oppo广东移动通信有限公司 | Electronic device |
| CN113194607A (en) * | 2021-03-26 | 2021-07-30 | 中国电子科技集团公司第二十九研究所 | Positioning and heat dissipation structure based on blind-mate feed of multilayer printed board |
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| CN102881997A (en) * | 2011-07-13 | 2013-01-16 | 联发科技（新加坡）私人有限公司 | Mobile communication device and antenna device |
| CN203644934U (en) * | 2013-12-13 | 2014-06-11 | 展讯通信（上海）有限公司 | Antenna device |
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| CN1404329A (en) * | 2001-09-11 | 2003-03-19 | 正文科技股份有限公司 | Improved Planar Inverted-F Antenna Device |
| CN1433104A (en) * | 2002-01-18 | 2003-07-30 | 松下电器产业株式会社 | Antenna equipment, communication equipment and antenna equipment designing method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112542678A (en) * | 2020-11-30 | 2021-03-23 | Oppo广东移动通信有限公司 | Electronic device |
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| CN113194607B (en) * | 2021-03-26 | 2022-06-14 | 中国电子科技集团公司第二十九研究所 | Positioning and heat dissipation structure based on blind-mate feed of multilayer printed board |
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