CN105742825A - Metasurface reflective array plane used for focusing electromagnetic waves - Google Patents
Metasurface reflective array plane used for focusing electromagnetic waves Download PDFInfo
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- CN105742825A CN105742825A CN201610235825.0A CN201610235825A CN105742825A CN 105742825 A CN105742825 A CN 105742825A CN 201610235825 A CN201610235825 A CN 201610235825A CN 105742825 A CN105742825 A CN 105742825A
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- phase
- shifting unit
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- metal patch
- super surface
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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
- H01Q15/14—Reflecting surfaces; Equivalent structures
- H01Q15/145—Reflecting surfaces; Equivalent structures comprising a plurality of reflecting particles, e.g. radar chaff
Abstract
The invention discloses a metasurface reflective array plane used for focusing electromagnetic waves. The super-surface reflective array plane comprises an array phase plate (2) formed by more than two phase shifting units (1), wherein each phase shifting unit (1) comprises a dielectric plate (3); a metal patch (4) is arranged on the surface of each dielectric plate (3); an upper hole (5) is formed in the middle of each metal patch (4); a metal grounding plate (6) is arranged at the bottom of each dielectric plate (3); a lower hole (7) is formed in the middle of each metal grounding plate (6); a metal tube (8) is arranged in the middle of each dielectric plate (3); and the metal tube (8) is communicated with the corresponding upper hole (5) and the corresponding lower hole (7). The metasurface reflective array plane has a quite excellent incident wave reflection and focusing effect; in addition, the incident wave reflection attenuation rate is lowered, so that the reflective effect of the metasurface reflective array plane is improved consequentluy; the reflection efficiency of the existing array antenna is normally 30-40%, while the reflection efficiency of the metasurface reflective array plane can reach 65%; and in addition, the metasurface reflective array plane also has the characteristics of small volume, light weight and low cost.
Description
Technical field
The present invention relates to reflect for the super surface of focused electromagnetic ripple front, belong to the communications field.
Background technology
The important focus focusing on research always scientist's research of electromagnetic wave, in order to ensure electromagnetism
Wave energy indiffusion when space propagation, electromagnetic wave must can focus on reception dress as light
Put, learn from the focusing analogy of light, for making electromagnetic wave focus on, launch the phase place of the bore of antenna
It must be sphere distribution.People to the research origin of focusing anteena in eighties of last century people's fifties
Research to transmission of electromagnetic energy problem, will the means transmitted as energy of electromagnetic wave.On
At the individual initial stage sixties in century, Goubao, Shermen, Borigiotti et al. are to aperture antenna
Focus issues done substantial amounts of work, established the theoretical basis of electromagnetic wave delivery of energy.This micro-
Ripple delivery of energy mode has obtained fast development in recent decades.Particularly in space is applied, micro-
It is that satellite in orbit delivery of energy, Space Facilities carry solar energy that ripple delivery of energy can be applied to ground station
Arrive the earth etc..Microwave is achieve power transmission wireless as the advantage of power transmission means
Changing, this is the most with practical value in a lot of occasions.The theory that electromagnetic wave focuses on can be not only used for micro-
Ripple delivery of energy, and may be used for radar and microwave directed energy weapon.In addition, based on focusing anteena
Focussing property, this antenna can also be applied to oncotherapy, microwave remote sensing, microwave
The fields such as orientation weapon.For oncotherapy, its can by by Voice segment in tumor,
Tumor is carried out hyperthermia treatment.For microwave orientation weapon, its effect is to make to feel in target
The partial electric-field maximum intensity of interest.But focusing anteena does not the most still have a kind of mature and reliable
Set juice method.Find out that the design theory and method of focusing anteena will be military in life, the energy,
The aspects such as medical treatment bring huge help, are also encountered by huge in terms of design theory and method simultaneously
Big challenge.
Having a variety of to the method for electromagnetic focusing, wherein application Meta Materials is focused being exactly one
Plant than more efficient, practical method.Meta Materials is to have the extraordinary thing not available for natural material
The artificial composite structure of rationality matter or composite, have negative magnetoconductivity, negative permittivity and zero
Unconventional electromagnetic property such as refractive index. nearly ten years, scientist grinds in the theory of Meta Materials
Study carefully, physical characteristic and application aspect have been made significant headway.Super surface is the two dimension of Meta Materials
Planar condition, has become focus and the forward position of Meta Materials research field recent years. wherein,
Phase gradient surpasses surface (phase gradient metasurfaces), because of its can realize right
The phenomenon controlling the various novelties of generation of electromagnetic wave wavefront includes the focusing of electromagnetic wave, receives
The extensive concern of researchers.Phase gradient surpasses surface and derives from Harvard University in 2011 the earliest
Z.Gaburro teaches seminar and dashes forward about the phase place utilizing ultra-thin single-layer metal structure metamaterial
Becoming and achieve the beam-shaping to light wave, they give broad sense catadioptric law, utilize nanometer
Aerial array composition phase gradient surpasses surface and is verified paradoxical reflex/transmission phenomenon, and
Give an example producing vortex wave beam.2012, the U.S. released university from sufferings
Professor V.M.Shalaev also utilizes the plane electromagnetism metamaterials of V word structural arrangement to realize
Echo and outgoing wave wide-angle beam are deflected, thus attracts wide attention.General phase
Potential gradient surpasses surface and designs, by artificial micro-structure based on SPA sudden phase anomalies and polarizing control thought
The two-dimentional novel artificial body structure surface in accordance with broad sense catadioptric law that unit is constituted, can be to electricity
Magnetic wave excite and transmission controls flexibly, realize paradoxical reflex/refraction, polarized rotation
And the function such as asymmetric transmission.It is extensive that phase gradient surpasses surface applications, and a lot of scholars are to it
Conducting in-depth research. the Pu of the Chinese Academy of Sciences etc. utilize symmetrical T-shaped structure at X-band
The successful design super surface cell of enough coverings 0 ° 360 °, and utilize this element to achieve
Broadband paradoxical reflex.Li etc. utilize circular configuration near 10GHz by control transmitted through
Phase gradient surpasses the direction of the transmitted wave on surface, it is achieved that the function of high efficiency regulatory electromagnetic wave beam.
The employing such as Zhou H-shaped structure devises monolayer reflection phase gradient and surpasses surface, it is achieved that special
Determine the one-dimensional reflection of electromagnetic wave in frequency band to focus on.Qu seminar uses split ring resonator (split
Ring resonator) devise reflection type phase gradient and surpass surface, particular pole can be dissolved
Be coupled as to radio magnetic wave more efficient surface wave utilizes efficient same polarization to reflect super surface simultaneously
Construction unit, devises a kind of efficient anti-focusing anteena and refers to that a class can be by electromagnetic wave picture
The same light of lens focus on impact point, reduce the electromagnetic wave diffusion when space propagation
Antenna.Along with the development of aircraft industry and developing rapidly of mobile communication, focusing anteena space flight,
The fields such as military project, communication, medical treatment play the most important role.
The phase adjusted model of these metal resonant elements existing (the light wave antenna of V-shape)
Enclosing is 0～2 π, and the scattering for light wave is less, and wave beam regulation and control efficiency is not the highest.
In the research work of V.M.Shalaev et al., although light wave obtains in very polarizers of big angle scope
Deflection, but its reflectance is less desirable.Therefore research and develop a reflection focusing good and
The super surface reflection unit that reflectance is high is necessary.
Summary of the invention
It is an object of the invention to, it is provided that a kind of super surface reflective array for focused electromagnetic ripple
Face.The present invention not only has the most superior incidence wave reflection focusing effect, and the present invention drops
The attenuation rate of low incidence wave reflection, thus improve the reflecting effect of the present invention, existing battle array
The reflection efficiency of array antenna is typically at 30%-40%, and the reflection efficiency of the present invention can reach
65%.In addition the present invention also has the feature that volume is little, lightweight, with low cost.
For solving above-mentioned technical problem, the technical scheme that the present invention provides is as follows: one is used for gathering
The super surface reflection front of burnt electromagnetic wave, the array rearranged including two or more phase-shifting unit
Phase-plate, phase-shifting unit includes dielectric-slab, and the surface of dielectric-slab is provided with metal patch, and metal pastes
The centre of sheet is provided with hole；The bottom of dielectric-slab is provided with metal ground plate, in metal ground plate
Between be provided with lower opening；The middle part of dielectric-slab is provided with metal tube, and metal tube connects with upper hole and lower opening.
Above-mentioned reflects in front for the super surface of focused electromagnetic ripple, described array phase plate
It is that phase-shifting unit from big to small and is outwards surrounded shape according to the surface area of metal patch and enters by center
Row rearranges.
Being previously described in the super surface reflection front of focused electromagnetic ripple, described phase-shifting unit is pressed
From big to small and outwards surrounded shape by center according to metal patch surface area and arrange 8 layers.
It is previously described in the super surface reflection front of focused electromagnetic ripple, described array phase plate
A center phase-shifting unit maximum including being positioned at center and area, center phase-shifting unit outwards and
Surround shape from big to small according to metal patch surface area and arrange 7 layers of outside phase-shifting unit, outside every layer
The number of portion's phase-shifting unit is (n-1) × 8, and n is the number of plies.
Be previously described for focused electromagnetic ripple super surface reflection front in, described phase-shifting unit and
Metal patch is square.
It is previously described in the super surface reflection front of focused electromagnetic ripple, described center phase-shifting unit
The length of side of metal patch be 9.06mm, the limit of the metal patch of described outside phase-shifting unit
Chang Cong center outwards be respectively 8.32mm, 7.92mm, 7.48mm, 6.70mm, 6.02mm,
3.92mm、1.91mm。
It is previously described in the super surface reflection front of focused electromagnetic ripple, described metal patch
Thickness is t=0.035mm with the thickness of metal ground plate.
It is previously described in the super surface reflection front of focused electromagnetic ripple, Jie of described dielectric-slab
Electric constant is 2.65, and the thickness of dielectric-slab is h=1.60mm.
It is previously described in the super surface reflection front of focused electromagnetic ripple, described upper hole and lower opening
Radius r1=0.5mm, the caliber of metal tube is r2=0.5mm.
Compared with prior art, the structure of phase-shifting unit has been made the improvement of creativeness by the present invention,
Phase-shifting unit is divided into from top to bottom metal patch, dielectric-slab and metal ground plate three part,
And be provided with metal tube in the middle of phase-shifting unit and run through this three part, one equivalence of composition of this three part
Circuit, compared with existing phase-shifting unit, hence it is evident that reduces the attenuation rate of incidence wave reflection, carries
The high reflecting effect of the present invention, the reflection efficiency of existing array antenna typically exists
30%-40%, and the reflection efficiency of the present invention can reach 65%, simulation calculation and experiment are measured
All show wave beam deflection efficiency more than more than 60%, and the conversion efficiency one of general transmittance structure
As all below 20%, achieve unforeseeable beneficial effect.Meanwhile, the present invention also has
The most superior incidence wave reflection focusing effect.Further, applicant is also to phase-shifting unit
Arrangement mode has been made preferably, preferably after structure further increase focusing power and efficiency, and
And realizing the accurate control to echo wavefront, phase change on reflection covers [0 °, 360 °], makes
Obtain the phase place of transmitted wave from 0 even variation to 2 π.
Accompanying drawing explanation
Fig. 1 is the perspective view of phase unit；
Fig. 2 is the front view of phase unit；
Fig. 3 is the structural representation of array phase plate；
Fig. 4 is that plane wave is along the schematic diagram after the Z-direction normal incidence present invention；
Fig. 5 is that electromagnetic wave is along the distribution map of the electric field in the x-z-plane after Z-direction incidence；
Fig. 6 is the distribution map of the electric field at maximum field strong point place focussing plane (x-y plane).
Detailed description of the invention
Below in conjunction with embodiment, the present invention is further illustrated.
Embodiment: a kind of for the super surface of focused electromagnetic ripple reflection front, such as accompanying drawing 1-3
Shown in, it is spliced into overall array phase plate 2, phase-shifting unit including by multiple phase-shifting units 1
1 includes that dielectric-slab 3, the surface of dielectric-slab 3 are provided with metal patch 4, in metal patch 4
Between offer hole 5；The bottom of dielectric-slab 3 is provided with metal ground plate 6, metal ground plate 6
Centre be provided with lower opening 7；The middle part of dielectric-slab 3 is provided with metal tube 8, metal tube 8 and upper hole
5 connect with lower opening 7.
In order to realize that echo wavefront is accurately controlled, phase change on reflection need cover [0 °,
360 °], for incident plane wave scattering problems we studied by gradually changeable array, figure
The array apparatus that 3 is the gradually changeable structure of design.Wherein, phase-shifting unit is according to metal patch
Surface area size is divided into 8 kinds, is square as preferred metal patch, 225 phase-shifting units
Including being positioned at 1 center phase-shifting unit at described array phase plate center, center phase-shifting unit
The length of side of metal patch be 9.06mm；Center phase-shifting unit outwards (the most upper and lower, left,
Right four dimensions) and surround the outside shifting of shape arrangement 7 layers from big to small according to metal patch surface area
Facies unit, the number of every layer of outside phase-shifting unit is (n-1) × 8, and n is the number of plies, such as the 2nd
The number of the outside phase-shifting unit of layer is 8, and the number of the 3rd layer of outside phase-shifting unit is 16.
Through applicant's repetition test, screen and sum up, the limit of the metal patch of 7 layers of outside phase-shifting unit
Chang Cong center outwards be respectively 8.32mm, 7.92mm, 7.48mm, 6.70mm, 6.02mm,
3.92mm、1.91mm.Above-mentioned arrangement architecture can make phase change on reflection cover [0 °, 360
°] so that the phase place of transmitted wave is from 0 even variation to 2 π.
Yet further, the thickness of described metal patch 4 with the thickness of metal ground plate 6 is
T=0.035mm.The dielectric constant of dielectric-slab 3 is 2.65, and the surface of dielectric-slab is 10mm × 10mm
Square, the thickness of dielectric-slab 3 is h=1.60mm, and metal ground plate is also 10mm × 10mm
Square, four sides of metal ground plate flush with dielectric-slab.Described upper hole 5 and lower opening
The radius r of 71=0.5mm, the caliber of metal tube 8 is r2=0.5mm.
The front that reflects for the super surface of focused electromagnetic ripple in embodiment has been made examination by applicant
Testing, accompanying drawing 4 is plane wave along the structural representation assembled after the Z-direction normal incidence present invention,
As can be seen from the figure the reflection of electromagnetic wave focusing effect of the present invention is good.Fig. 5 is along Z axis
The distribution map of the electric field in x-z-plane after the incidence of direction, it can be seen that maximum field strength
Position occur in the position at 100mm, the change of field intensity is relatively slow, this explanation
This focusing array has the good depth of focus.Fig. 6 is to focus at maximum field strong point place to put down
The distribution map of the electric field in face (x-y plane), it appeared that the energy of focus is much larger than week from figure
The energy enclosed, embodies good focusing effect.
The super surface apparatus range of application of the present invention can be not only used for reflectarray antenna, also may be used
To be applied to other occasion needing to use multifocal reflection focusing.
Claims (9)
1. for focused electromagnetic ripple super surface reflection front, it is characterised in that: include two with
The array phase plate (2) that upper phase-shifting unit (1) rearranges, phase-shifting unit (1) includes being situated between
Scutum (3), the surface of dielectric-slab (3) is provided with metal patch (4), metal patch (4)
Centre is provided with hole (5)；The bottom of dielectric-slab (3) is provided with metal ground plate (6), metal
The centre of earth plate (6) is provided with lower opening (7)；The middle part of dielectric-slab (3) is provided with metal tube (8),
Metal tube (8) connects with upper hole (5) and lower opening (7).
It is the most according to claim 1 for the super surface of focused electromagnetic ripple reflection front,
It is characterized in that: described array phase plate (2) is that phase-shifting unit (1) is according to metal patch
(4) surface area from big to small and is outwards surrounded what shape carried out rearranging by center.
It is the most according to claim 2 for the super surface of focused electromagnetic ripple reflection front,
It is characterized in that: described phase-shifting unit (1) according to metal patch (4) surface area from greatly to
Little Qie You center outwards surrounds shape and arranges 8 layers.
It is the most according to claim 3 for the super surface of focused electromagnetic ripple reflection front,
It is characterized in that: described array phase plate (2) includes being positioned at center and the one of area maximum
Individual center phase-shifting unit (11), center phase-shifting unit (11) is outwards and according to metal patch table
Area surrounds shape from big to small and arranges 7 layers of outside phase-shifting unit (12), every layer of outside phase shift list
The number of unit (12) is (n-1) × 8, and n is the number of plies.
It is the most according to claim 4 for the super surface of focused electromagnetic ripple reflection front,
It is characterized in that: described phase-shifting unit (2) and metal patch (4) are square.
It is the most according to claim 5 for the super surface of focused electromagnetic ripple reflection front,
It is characterized in that: the length of side of the metal patch at described center phase-shifting unit (11) is 9.06mm,
The length of side of the metal patch of described outside phase-shifting unit (12) is outwards respectively from center
8.32mm、7.92mm、7.48mm、6.70mm、6.02mm、3.92mm、1.91mm。
It is the most according to claim 1 for the super surface of focused electromagnetic ripple reflection front,
It is characterized in that: the thickness of described metal patch (4) and the thickness of metal ground plate (6)
For t=0.035mm.
It is the most according to claim 1 for the super surface of focused electromagnetic ripple reflection front,
It is characterized in that: the dielectric constant of described dielectric-slab (3) is 2.65, dielectric-slab (3)
Thickness be h=1.60mm.
It is the most according to claim 1 for the super surface of focused electromagnetic ripple reflection front,
It is characterized in that: described upper hole (5) and the radius r of lower opening (7)1=0.5mm, metal tube
(8) caliber is r2=0.5mm.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107335147A (en) * | 2017-06-29 | 2017-11-10 | 电子科技大学 | A kind of surface wave energy coupling head suitable for microwave physical therapy |
| CN107769298A (en) * | 2017-09-25 | 2018-03-06 | 西安交通大学 | A kind of super surface texture wireless charging device of dynamic Frequency Adjustable and its application |
| CN109444998A (en) * | 2018-11-30 | 2019-03-08 | 华中科技大学 | A kind of super surface condenser lens |
| CN110011059A (en) * | 2019-04-03 | 2019-07-12 | 浙江科技学院 | A kind of super surface array antenna of the multilayer of focus type |
| CN110021822A (en) * | 2019-03-19 | 2019-07-16 | 浙江科技学院 | A kind of super surface array antenna of focus type |
| CN110729565A (en) * | 2019-10-29 | 2020-01-24 | Oppo广东移动通信有限公司 | Array lens, lens antenna, and electronic apparatus |
| CN110749883A (en) * | 2019-12-23 | 2020-02-04 | 浙江科技学院 | Traffic speed measuring radar for highway |
| CN112134020A (en) * | 2020-09-03 | 2020-12-25 | 浙江科技学院 | Super surface array antenna based on phase gradient |
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| CN107335147B (en) * | 2017-06-29 | 2019-08-13 | 电子科技大学 | A kind of surface wave energy coupling head suitable for microwave physical therapy |
| CN107335147A (en) * | 2017-06-29 | 2017-11-10 | 电子科技大学 | A kind of surface wave energy coupling head suitable for microwave physical therapy |
| CN107769298B (en) * | 2017-09-25 | 2020-03-17 | 西安交通大学 | Dynamic frequency-adjustable super-surface-structure wireless charging device and wireless charging method |
| CN107769298A (en) * | 2017-09-25 | 2018-03-06 | 西安交通大学 | A kind of super surface texture wireless charging device of dynamic Frequency Adjustable and its application |
| CN109444998A (en) * | 2018-11-30 | 2019-03-08 | 华中科技大学 | A kind of super surface condenser lens |
| CN110021822A (en) * | 2019-03-19 | 2019-07-16 | 浙江科技学院 | A kind of super surface array antenna of focus type |
| CN110011059A (en) * | 2019-04-03 | 2019-07-12 | 浙江科技学院 | A kind of super surface array antenna of the multilayer of focus type |
| CN110729565A (en) * | 2019-10-29 | 2020-01-24 | Oppo广东移动通信有限公司 | Array lens, lens antenna, and electronic apparatus |
| CN110729565B (en) * | 2019-10-29 | 2021-03-30 | Oppo广东移动通信有限公司 | Array lens, lens antenna, and electronic apparatus |
| CN110749883A (en) * | 2019-12-23 | 2020-02-04 | 浙江科技学院 | Traffic speed measuring radar for highway |
| CN110749883B (en) * | 2019-12-23 | 2020-04-07 | 浙江科技学院 | Traffic speed measuring radar for highway |
| CN112134020A (en) * | 2020-09-03 | 2020-12-25 | 浙江科技学院 | Super surface array antenna based on phase gradient |
| CN112134020B (en) * | 2020-09-03 | 2023-05-12 | 浙江科技学院 | Super-surface array antenna based on phase gradient |
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