CN104347939B - Multi-input multi-output antenna system and radiation absorption method - Google Patents
Multi-input multi-output antenna system and radiation absorption method Download PDFInfo
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- CN104347939B CN104347939B CN201310337485.9A CN201310337485A CN104347939B CN 104347939 B CN104347939 B CN 104347939B CN 201310337485 A CN201310337485 A CN 201310337485A CN 104347939 B CN104347939 B CN 104347939B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
- H01Q9/045—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with particular feeding means
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
- H01Q15/006—Selective devices having photonic band gap materials or materials of which the material properties are frequency dependent, e.g. perforated substrates, high-impedance surfaces
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
- H01Q21/061—Two dimensional planar arrays
- H01Q21/065—Patch antenna array
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- Optics & Photonics (AREA)
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Abstract
The present invention provides a kind of multi-input multi-output antenna systems and radiation absorption method.It is related to mobile communication technology field；It solves the problems, such as to reduce SAR value.The system includes：The mimo antenna and pcb board of coupling, the system further includes a metal radiation patch coupled with the mimo antenna by pcb board, the metal radiation piece is two-dimensional electromagnetic bandgap structure, the pcb board is between the mimo antenna and the metal radiation piece, and the mimo antenna is overlapped with the pcb board, metal radiation patch vertical view；The two-dimensional electromagnetic bandgap structure absorbs the electromagnetic wave of frequency that the mimo antenna is sent out outside the two-dimensional electromagnetic bandgap structure band gap.Technical solution provided by the invention is suitable for electronic electric equipment, and realizing the SAR value easily implemented reduces means.
Description
Technical field
The present invention relates to how defeated communication of mobile terminal technical field, more particularly to one kind be for reducing mobile terminal multi input
The SAR value for going out (MIMO) antenna reduces MIMO days of the radiation injury to human body under the premise of ensureing its normal communication efficiency
Linear system is united and radiation absorption method.
Background technology
Currently, many people have known that electromagnetic radiation can directly produce the organ of human body, cell or nervous system
Raw harm, this is the electromagnetic biological effects of electromagnetic field, in order to characterize electromagnetic wave with electromagnetic wave after organism interaction to human body
Effect degree, there has been proposed the concepts of specific absorption rate --- SAR (Specific Absorption Rate), specific absorption rate
Refer to the organism (including human body) of unit mass in unit interval systemic electromagnetic radiation energy (watt), unit W/Kg.This
A little electromagnetic radiation are not limited solely to large-size machine equipment, and refrigerator, computer, PDA in our daily lifes etc. can be used as spoke
Penetrate source, especially mobile communication terminal fast-developing at present, the quality and rate request that user transmits information are higher and higher, energy
It is enough effectively to realize that the MIMO technology of this target comes into being, and carry MIMO multiaerial systems and carry out large capacity information transmission
Mobile terminal also inevitably bring more electromagnetic radiation drawbacks.The mobile terminal device of mimo system requires placement
More antennas do not increase multiaerial system how while meeting the electrical performance indexes such as corresponding bandwidth, gain, isolation
To the SAR value of human body, this proposes Antenna Design new challenge.
Currently, mainly having commonly used to the method for reducing antenna system SAR value：(1) it is applied on the inner casing of terminal or shell
It shielding material is covered, when making terminal transmission electromagnetic signal, can be shielded towards the unwanted electromagnetic wave of human body, reduced with this
SAR value, but this method causes shielded layer to also reduce the efficiency of transmission of signal, Er Qiesui while shielding unwanted electromagnetic wave
The accumulation shielded layer of time also gradually thinning can lose shielding action；(2) conductor material is added between antenna and manikin
Material makes antenna radiation pattern become cardioid pattern by circle, and then drop using conductor material by the reflection of electromagnetic wave of directive human body
Low terminal antenna SAR value, but the reflecting plate will be carried out according to different master machine antenna shapes for design, and cost is higher；(3) exist
The magnetic materials such as Ferrite Material, which are added, close to the side of human body can effectively reduce antenna SAR value, reduce SAR value at present
In method, this method is occupied an leading position, but the characteristic that electromagnetic wave is propagated from low magnetic permeability to high magnetic permeability direction, is caused useful
Signal can be also isolated, and reduce communication efficiency；(4) SAR value, but transmission power can also be reduced by reducing transmission power
Again directly proportional to signal transmission energy, so to find focal point can be only achieved win-win, randomness is bigger.
And to solve the problems, such as the reduction of multiple antennas SAR value in mobile terminal, it is just faced with that area is small, and volume is thin, protects simultaneously
The challenges such as radiation efficiency and communication quality are demonstrate,proved, the existing method for reducing SAR value mentioned above is all both advantageous and disadvantageous, but lacks spirit
Activity, it is difficult to adapt to communications industry present situation fast-developing at present, it would be highly desirable to which a kind of method of new reduction SAR value is existing to change
Shape.
Invention content
The present invention provides a kind of mimo antenna system, solve the problems, such as to reduce SAR value.
A kind of mimo antenna system, includes the mimo antenna and pcb board of coupling, the system further include one by pcb board with
The metal radiation patch of the mimo antenna coupling, the metal radiation piece is two-dimensional electromagnetic bandgap structure, and the pcb board is in
Between the mimo antenna and the metal radiation piece, the mimo antenna is overlooked with the pcb board, the metal radiation patch
It overlaps；
The two-dimensional electromagnetic bandgap structure absorbs frequency that the mimo antenna is sent out in the two-dimensional electromagnetic bandgap structure
Electromagnetic wave outside band gap.
Preferably, the metal radiation patch includes multiple sub- patches, and multiple sub- patch is in same plane, sub- patch
It is connectionless between piece.
Preferably, the sub- patch is flower ring type structure, and the colored ring type structure includes four flower type structures, four flower pattern
The center of structure is respectively at four vertex of a positive square, connectionless between flower type structure；
The flower type structure includes a positive square, and the quadrangle of the positive square structure is round petal design, the petal knot
The center of circle of structure is the vertex of the positive square pistil structure, and the positive square pistil structure and round petal design constitute high resistant electricity
The capacitance on road；
Four rectangular configurations are extended at four side midpoints of the positive square pistil structure, which constitutes high resistance circuit
Inductance；
The positive square pistil structure and round petal design constitute the capacitance of high resistance circuit and the rectangular configuration is constituted
The inductance in parallel of high resistance circuit.
Preferably, the mimo antenna is bending structure.
Preferably, the coverage area of the metal radiation patch is overlapped with the bending structure of the mimo antenna.
Preferably, the pcb board outer layer further includes one layer of earth plate, bends and ties with the mimo antenna on the earth plate
The corresponding position hollow out of structure, the metal radiation patch are placed in the hollow-out parts of the earth plate.
Preferably, twice of the diameter of the petal design is not more than the length of side of the positive square pistil structure.
The present invention also provides a kind of radiation absorption methods using above-mentioned mimo antenna system, including：
The two-dimensional electromagnetic bandgap structure forms band gap in band structure；
When electromagnetic wave is by the band structure, if the frequency of the electromagnetic wave outside band gap, the band structure
Filter the electromagnetic wave.
Preferably, this method further includes：
When the frequency of the electromagnetism mother-in-law is in the band gap, the band structure carries out full transmitting to the electromagnetic wave.
Preferably, this method further includes：
Capacitance is adjusted by adjusting the length of side of the positive square pistil structure；
Extend the length tune that four rectangular configurations extend by adjusting four side midpoints of the positive square pistil structure
Whole inductance.
The present invention provides a kind of mimo antenna system and radiation absorption method, which includes the more of coupling
Input multi output (MIMO) antenna and pcb board, which is characterized in that the system further includes one by pcb board and the mimo antenna
The metal radiation patch of coupling, the metal radiation piece are two-dimensional electromagnetic bandgap structure, and the pcb board is in the mimo antenna
Between the metal radiation piece, the mimo antenna is overlapped with the pcb board, metal radiation patch vertical view, and described two
Dimension electromagnetic bandgap structure absorbs the electromagnetic wave of frequency that the mimo antenna is sent out outside the two-dimensional electromagnetic bandgap structure band gap,
Near mimo antenna resonant frequency, the impedance for the LC equivalent circuits in parallel that metal radiation patch provides is infinitely great, forms table
The frequency band gap of surface wave solves the problems, such as to reduce SAR value to prevent propagation of the energy to human body.
Description of the drawings
Fig. 1 is the LTE terminal mimo antenna schematic diagram that present invention citing is related to；
Fig. 2 is that the present invention mentions whole reverse side schematic diagram after addition electromagnetic bandgap structure；
Fig. 3 is electro-magnetic bandgap cellular construction schematic diagram in the present invention；
Fig. 4 is the antenna performance parameters schematic diagram of MIMO when electromagnetic bandgap structure is not added by the present invention；
Fig. 5 is the antenna performance parameters schematic diagram of MIMO when electromagnetic bandgap structure is added in the present invention.
Specific implementation mode
Currently, mainly having commonly used to the method for reducing antenna system SAR value：(1) it is applied on the inner casing of terminal or shell
It shielding material is covered, when making terminal transmission electromagnetic signal, can be shielded towards the unwanted electromagnetic wave of human body, reduced with this
SAR value, but this method causes shielded layer to also reduce the efficiency of transmission of signal, Er Qiesui while shielding unwanted electromagnetic wave
The accumulation shielded layer of time also gradually thinning can lose shielding action；(2) conductor material is added between antenna and manikin
Material makes antenna radiation pattern become cardioid pattern by circle, and then drop using conductor material by the reflection of electromagnetic wave of directive human body
Low terminal antenna SAR value, but the reflecting plate will be carried out according to different master machine antenna shapes for design, and cost is higher；(3) exist
The magnetic materials such as Ferrite Material, which are added, close to the side of human body can effectively reduce antenna SAR value, reduce SAR value at present
In method, this method is occupied an leading position, but the characteristic that electromagnetic wave is propagated from low magnetic permeability to high magnetic permeability direction, is caused useful
Signal can be also isolated, and reduce communication efficiency；(4) SAR value, but transmission power can also be reduced by reducing transmission power
Again directly proportional to signal transmission energy, so to find focal point can be only achieved win-win, randomness is bigger.
And to solve the problems, such as the reduction of multiple antennas SAR value in mobile terminal, it is just faced with that area is small, and volume is thin, protects simultaneously
The challenges such as radiation efficiency and communication quality are demonstrate,proved, the existing method for reducing SAR value mentioned above is all both advantageous and disadvantageous, but lacks spirit
Activity, it is difficult to adapt to communications industry present situation fast-developing at present, it would be highly desirable to which a kind of method of new reduction SAR value is existing to change
Shape.
To solve the above-mentioned problems, the embodiment provides a kind of mimo antenna systems.Below in conjunction with attached
The embodiment of the present invention is described in detail in figure.It should be noted that in the absence of conflict, the embodiment in the application
And the feature in embodiment mutually can be combined arbitrarily.
Below in conjunction with the accompanying drawings to a kind of mimo antenna system progress reducing terminal mimo antenna SAR value provided by the invention
Explanation.
The technical solution of the embodiment of the present invention provides a kind of new structure that can reduce terminal antenna SAR value, in original
Have and a kind of electromagnetic bandgap structure (EBG, Electromagnetic Band Gap) is added on the basis of antenna.EBG is from photon
A kind of periodic structure that bandgap structure develops, be essentially different medium, metal radiation patch etc. mixing body unit by
The array arrangement that period carries out, has certain forbidden band characteristic, can control electromagnetic wave propagation to a certain extent.EBG has
The principle of forbidden band characteristic is：When electromagnetic wave is propagated in periodic dielectric, by modulation, energy band knot can be formed
Structure, and band gap appears between band structure at this time.The electromagnetic wave of certain frequency is if its frequency is in band gap, band gap
Without any state, in this way institute's directive electromagnetic wave full transmitting can occur for inside.Due to the presence of this characteristic, EBG structures
It can be applied in microstrip antenna, design inhibits the surface wave of substrate between antenna element and human body as high resistance circuit
And higher hamonic wave, electromagnetic energy of the antenna element to human body radiation is reduced, to reduce the SAR value of absorption of human body.
Electromagnetic bandgap structure is used in microwave designing can be improved antenna radiation efficiency and reduces antenna height, reduces microwave electricity
Harmonic wave in road improves the directionality of antenna, there is certain resistance to the backward radiation of antenna.Electromagnetic bandgap structure exists at present
Application in antenna focuses mainly on its shadow to antenna parameters such as antenna radiation pattern, minor level, scattering interface, isolations
It ringing, electromagnetic bandgap structure is applied in Antenna Design generally based on rectangular aperture array or rectangle band gap array at present, this
Inventive embodiments utilize the band-stop response of EBG, are applied in the design for reducing isolation, are designed to " garland " type knot
Structure carries out simulation calculating, by data analysis it can be seen that electro-magnetic bandgap knot with SEMCAD profession bioelectromagnetics simulation software
The addition of structure plays the role of the reduction of SAR value apparent.
Mimo antenna system structure provided in an embodiment of the present invention is as follows：
Due to effect, that is, filter of electro-magnetic bandgap, therefore relatively a variety of different mobile terminal working frequency range, as long as using
With frequency band gap structure, you can using the property of its filtering, the clutter for excluding other frequency ranges as big as possible influences.The EBG of early stage
Structure is typically designed as three-dimensional structure, but due to the difficulty of processing, is more likely to the research of two-dimentional EBG at present, and the present invention is implemented
Example uses two-dimensional electromagnetic bandgap structure, specially two-dimentional " rosette " structure to be placed in pcb board and MIMO as metal radiation piece
The corresponding position of antenna, flower ring type structure are made of multiple flower type structures.Flower type structure is made with the length of side for the square structure of b
For " pistil ", quadrangle is that the center of circle of circle " petal " structure that radius is r0 is the vertex of positive square structure, is equivalent to high resistant electricity
Four a length of s1 are stretched out at the capacitance C on road, four square side midpoints, and width is the rectangular configuration of s, is equivalent to the inductance of high resistance circuit
L, two-dimensional electromagnetic bandgap structure are made of two connected " garland type " structures.Near mimo antenna resonant frequency,
The impedance for the LC equivalent circuits in parallel that flower ring type structure is constituted is infinitely great, the frequency band gap of surface wave is formed, to prevent energy
Measure the propagation to human body.
As shown in Figure 1, since first commercial mimo system occurs in a wlan, but it is expanded using hot spot now
The field of wireless communication including WiMAX and LTE is arrived, so being moved for LTE with mimo antenna in the embodiment of the present invention
It is illustrated for terminal (commercial working frequency is in 2.6GHz).It should be noted that the technology that the embodiment of the present invention is provided
Scheme is suitable for all occasions for applying mimo antenna, and the embodiment of the present invention is only by taking LTE mobile terminal as an example, practical ranges
It is not limited to this.Mimo antenna in the embodiment of the present invention is designed to that bending structure, tool effectively reduce the coupling between antenna, contracting
The advantages that miniature antenna size, coupling can equally be reduced by emptying earth plate at two angles in antenna upper left and upper right, and such floor is just
At "T"The imperfection of shape structure, earth plate has become the mainstream of Antenna Design.Dielectric-slab uses FR-4, dielectric constant
It is 4.4, thickness 0.51mm, size 46mm*34mm.
As shown in Fig. 2, for the whole inverse plan view of two-dimensional electromagnetic bandgap structure is added.The two-dimensional electromagnetic bandgap structure with
The form of metal radiation patch occurs, and does not generate additional thickness and increases, places it at the earth plate hollowed out across PCB
Plate is coupled with mimo antenna, is equivalent to LC high resistance circuits and is played forbidden band, since size limits, mainly placed 8 here
Flower structure, each mimo antenna unit get 4 compositions, one colored ring type structure, and compact connected, meet two-dimensional electromagnetic band
The classical type of attachment of gap structure.According to existing terminal structure, ground connection corresponding with MIMO individual antenna unit bending parts
Plate is emptied, and size is 21.5mm (length) * 17mm (width), and the parameters value finally chosen is as follows：R0=1mm, b=5mm, s
=1mm, s1=2mm.
Wherein steps are as follows for the value of r0, b, s, s1：
Step 1：The array of classical two-dimensional electromagnetic bandgap structure is usually no more than 3 row, and it is seamless to be connected to each other, this hair
3 row and 2 row have been selected to be designed in bright embodiment, obtaining 2 array structures by emulation reduces SAR value effect obviously and to antenna
Performance parameter influence is smaller, and parameter value determination process is similar, takes 2 to be classified as example.That is transverse direction 4*s1+2*b≤21.5mm, i.e., single flower
Ring will meet 2*s1+b≤10.75mm, and longitudinal single garland will equally meet 2*s1+b≤17/2=8.5mm, take intersection 2*s1+
B≤8.5mm, and it is directly proportional to connecting line 2s1 according to theoretical formula inductance L, and capacitance C is directly proportional to b,F herein
=2.6GHz, so 2s1 is inversely proportional with b, but structure design b is greater than 2s1 to constitute rosette structure, choose b from 4.5mm to
Upper increase, which carries out sweeping ginseng in HFSS, obtains b=5mm.
Step 2：S1≤1.75mm can be obtained by b=5mm, but close-connected point in two-dimensional electromagnetic bandgap structure
Branch part can be overlapped with fraction, therefore longitudinally connected in order to meet the overlapping that existing size uses 0.25mm here, by sweeping
Ginseng obtains s1=2mm, wide s=1mm.
Step 3：Under normal circumstances, branch must not exceed the length of b, so 4r0≤b, r0=1mm is obtained through overscan ginseng.
As shown in figure 3, bandgap structure unit size very little, is rosette structure, square is pistil, and quadrangle is round flower
Valve, four side midpoints are the rectangle petal stretched out.In existing electromagnetic bandgap structure, three-dimensional rectangle array structure is more, and square
The length of shape and the height of coaxial feeder influence clearly antenna performance, it is clear that the adjusting of length is to floor area
It is more demanding, and the adjusting of height is also no small challenge to mobile terminal.And this is then not present in the two-dimensional electromagnetic bandgap structure
Class problem, as long as ensureing that the ratio value of pistil b and branch s1, pair radius r0 are finely adjusted, you can realize target, there is no to end
The misgivings for holding thickness, realize the lightening high request of mobile terminal well.
As shown in Figures 4 and 5, it is that the front and back influence signal to each performance parameter of antenna is added in two-dimensional electromagnetic bandgap structure
Figure, emulates in HFSS and obtains, and the addition of electromagnetic bandgap structure does not produce bigger effect the performance parameter of antenna, radiation
Efficiency, peak gain etc. do not generate large change, ensure that design requirement.
It is being emulated in SEMCAD the result shows that, the addition of electromagnetic bandgap structure so that the maximum value of SAR value
It is reduced to 0.711mW/g from 1.167mW/g, reduces about 40%.
Analysis is found when other conditions are identical, in a mimo antenna, is not powered on ultra wide and is added
Antenna parameter performance is not significantly altered in the case of having entered two kinds of electromagnetic bandgap structure, in the case of both front and back in this example
S11, s22 are still maintained at 2.6GHz, and radiation efficiency and gain do not have excessive change；But SAR value can but reduce, in turn
The radiation injury of human body is reduced, as SAR value reduces about 40% in this example.The limitation of condition, SAR when in view of actual test
The decreasing value of value can change, but its trend will not become, therefore can provide certain reference for later engineering practice.
In the following, in conjunction with attached drawing, the embodiment of the present invention two is illustrated.
An embodiment of the present invention provides a kind of multi-input multi-output antenna systems using described in the embodiment of the present invention one
Radiation absorption method, using this method complete radiation absorption flow it is as follows：
The two-dimensional electromagnetic bandgap structure forms band gap in band structure.When electromagnetic wave is by the band structure,
If the frequency of the electromagnetic wave, outside band gap, the band structure filters the electromagnetic wave；When the frequency of the electromagnetism mother-in-law exists
When in the band gap, the band structure carries out full transmitting to the electromagnetic wave.
Preferably, since the positive square pistil structure and round petal design constitute the capacitance of high resistance circuit, therefore can lead to
Cross the length of side adjustment capacitance for adjusting the positive square pistil structure；Since four side midpoints of the positive square pistil structure extend
The rectangular configuration gone out constitutes the inductance of high resistance circuit, therefore can be by adjusting the length adjustment inductance that rectangular configuration is extended.
The embodiment provides multiple-input and multiple-output (MIMO) antennas of a kind of mimo antenna structure, including coupling
With pcb board, which is characterized in that the system further includes a metal radiation patch coupled with the mimo antenna by pcb board, institute
It is two-dimensional electromagnetic bandgap structure to state metal radiation piece, and the pcb board is between the mimo antenna and the metal radiation piece,
The mimo antenna is overlapped with the pcb board, metal radiation patch vertical view, described in the two-dimensional electromagnetic bandgap structure absorption
Electromagnetic wave of the frequency that mimo antenna is sent out outside the two-dimensional electromagnetic bandgap structure band gap, it is attached in mimo antenna resonant frequency
Closely, the impedance for the LC equivalent circuits in parallel that metal radiation patch provides is infinitely great, the frequency band gap of surface wave is formed, to hinder
Only propagation of the energy to human body solves the problems, such as to reduce SAR value.
The two-dimensional electromagnetic bandgap structure is only attached at floor, and processing cost and technique are all very simple, effectively reduce day
The complexity of line design.Two-dimensional electromagnetic bandgap structure can regard high resistance circuit as, can reduce surface wave loss, simple in structure,
It is permanent effective, and can effectively reduce SAR value of the terminal to human body radiation.Using two-dimensional electromagnetic bandgap structure, it is not introduced into additional
Thickness, and the radiance of antenna itself is influenced less, the preferable requirement for realizing that Nowadays mobile terminals are lightening accounts for area
It is small, strong applicability.
One of ordinary skill in the art will appreciate that all or part of step of above-described embodiment can use computer journey
Sequence flow realizes that the computer program can be stored in a computer readable storage medium, the computer program exists
(such as system, unit, device) executes on corresponding hardware platform, when being executed, include the steps that embodiment of the method it
One or combinations thereof.
Optionally, all or part of step of above-described embodiment can also realize that these steps can using integrated circuit
To be fabricated to integrated circuit modules one by one respectively, or by them multiple modules or step be fabricated to single integrated electricity
Road module is realized.In this way, the present invention is not limited to any specific hardware and softwares to combine.
General computing device may be used to realize in each device/function module/functional unit in above-described embodiment, it
Can be concentrated on a single computing device, can also be distributed on network constituted by multiple computing devices.
Each device/function module/functional unit in above-described embodiment realized in the form of software function module and as
Independent product sale in use, can be stored in a computer read/write memory medium.Computer mentioned above
Read/write memory medium can be read-only memory, disk or CD etc..
Any one skilled in the art in the technical scope disclosed by the present invention, can readily occur in variation or
It replaces, should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with the guarantor described in claim
It protects subject to range.
Claims (7)
1. a kind of multi-input multi-output antenna system, includes the multiple-input and multiple-output mimo antenna and pcb board of coupling, feature exists
In the system further includes a metal radiation patch coupled with the mimo antenna by pcb board, and the metal radiation piece is two
Electromagnetic bandgap structure is tieed up, the pcb board is between the mimo antenna and the metal radiation piece, the mimo antenna and institute
State pcb board, the metal radiation patch is overlooked and overlapped；
The two-dimensional electromagnetic bandgap structure absorbs frequency that the mimo antenna is sent out in the two-dimensional electromagnetic bandgap structure band gap
Outer electromagnetic wave；
Wherein, the metal radiation patch includes multiple sub- patches, and multiple sub- patch is in same plane, nothing between sub- patch
Connection；
The sub- patch is flower ring type structure, and the colored ring type structure includes four flower type structures, the center of four flower type structures
It is respectively at four vertex of a positive square, it is connectionless between flower type structure；
The flower type structure includes a positive square, and the quadrangle of the positive square structure is round petal design, the circle petal knot
The center of circle of structure is the vertex of positive square pistil structure, and the positive square pistil structure and round petal design constitute high resistance circuit
Capacitance；
Four rectangular configurations are extended at four side midpoints of the positive square pistil structure, which constitutes the electricity of high resistance circuit
Sense；
The positive square pistil structure and round petal design constitute the capacitance of high resistance circuit and the rectangular configuration constitutes high resistant
The inductance in parallel of circuit.
2. multi-input multi-output antenna system according to claim 1, which is characterized in that the mimo antenna is that bending is tied
Structure.
3. multi-input multi-output antenna system according to claim 2, which is characterized in that the metal radiation patch covers
Lid range is overlapped with the bending structure of the mimo antenna.
4. multi-input multi-output antenna system according to claim 2, which is characterized in that the pcb board outer layer further includes
One layer of earth plate, position hollow out corresponding with the mimo antenna bending structure on the earth plate, the metal radiation patch
It is placed in the hollow-out parts of the earth plate.
5. multi-input multi-output antenna system according to claim 1, which is characterized in that it is described circle petal design it is straight
Twice of diameter is not more than the length of side of the positive square pistil structure.
6. a kind of radiation absorption method using multi-input multi-output antenna system described in any one of claim 1 to 5, special
Sign is, including：
The two-dimensional electromagnetic bandgap structure forms band gap in band structure；
When electromagnetic wave is by the band structure, if the frequency of the electromagnetic wave, outside band gap, the band structure filters
The electromagnetic wave；
Capacitance is adjusted by adjusting the length of side of the positive square pistil structure；
Extend the length adjustment electricity that four rectangular configurations extend by adjusting four side midpoints of the positive square pistil structure
Sense.
7. radiation absorption method according to claim 6, which is characterized in that this method further includes：
When the frequency of the electromagnetic wave is in the band gap, the band structure carries out full transmitting to the electromagnetic wave.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310337485.9A CN104347939B (en) | 2013-08-05 | 2013-08-05 | Multi-input multi-output antenna system and radiation absorption method |
| PCT/CN2013/088887 WO2014161348A1 (en) | 2013-08-05 | 2013-12-09 | Multiple input multiple output antenna system and radiation absorption method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310337485.9A CN104347939B (en) | 2013-08-05 | 2013-08-05 | Multi-input multi-output antenna system and radiation absorption method |
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| CN104347939B true CN104347939B (en) | 2018-10-26 |
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| CN105591189B (en) * | 2015-12-03 | 2019-06-07 | 深圳市天鼎微波科技有限公司 | The antenna for mobile phone of low SAR value |
| CN106025510A (en) * | 2016-08-03 | 2016-10-12 | 北京邮电大学 | Antenna |
| WO2021145723A1 (en) * | 2020-01-16 | 2021-07-22 | 삼성전자 주식회사 | Antenna module comprising floating radiators in communication system, and electronic device comprising same |
| CN111525276B (en) * | 2020-04-13 | 2022-01-04 | Oppo广东移动通信有限公司 | Electronic device |
| CN113451784B (en) * | 2021-07-14 | 2022-06-21 | 海宁利伊电子科技有限公司 | High-performance packaging radiation absorber |
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| CN100499258C (en) * | 2005-05-19 | 2009-06-10 | 上海联能科技有限公司 | Antenna made of high dielectric microwave composite material |
| US8624788B2 (en) * | 2011-04-27 | 2014-01-07 | Blackberry Limited | Antenna assembly utilizing metal-dielectric resonant structures for specific absorption rate compliance |
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2013
- 2013-08-05 CN CN201310337485.9A patent/CN104347939B/en not_active Expired - Fee Related
- 2013-12-09 WO PCT/CN2013/088887 patent/WO2014161348A1/en active Application Filing
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| Publication number | Publication date |
|---|---|
| WO2014161348A1 (en) | 2014-10-09 |
| CN104347939A (en) | 2015-02-11 |
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