CN105789905B - A kind of super surface of gyromagnet substrate based on metallic film antistructure - Google Patents
A kind of super surface of gyromagnet substrate based on metallic film antistructure Download PDFInfo
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- CN105789905B CN105789905B CN201610107486.8A CN201610107486A CN105789905B CN 105789905 B CN105789905 B CN 105789905B CN 201610107486 A CN201610107486 A CN 201610107486A CN 105789905 B CN105789905 B CN 105789905B
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- antistructure
- super surface
- metallic film
- gyromagnet
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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
- H01Q15/0086—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices having materials with a synthesized negative refractive index, e.g. metamaterials or left-handed materials
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Abstract
The present invention relates to artificial micro-structure electromagnetism and electromagnetism Meta Materials field more particularly to a kind of super surface of gyromagnet substrate based on metallic film antistructure.The present invention provides a kind of super surface of gyromagnet substrate based on metallic film antistructure, which includes npA basic cell structure, the base board unit structure includes upper layer artificial micro-structure and underlying substrate, its upper layer artificial micro-structure is ultrathin paster structure, its thickness is less than 1 millimeter in microwave band 1-2 GHz, to have fluted perfect electrical conductor material, underlying substrate is with external magnetic field response characteristic gyromagnetic material.The present invention is super, and entire surface volume is very thin, is highly suitable to be applied for small size and integrates electromagnetic device, the loss very little of waveguide belongs to a kind of lossless device.Transmission range of the electromagnetic wave in the waveguide is longer to can be used as remote guide wave device.It is simple to be also equipped with making, cost is relatively low, can simply be made of PCB processing technologys.
Description
Technical field
It is based on artificial super surface and gyromagnetism base the present invention relates to artificial micro-structure electromagnetism and electromagnetism Meta Materials field
The research of the dynamic adjustable microwave device of ground combination more particularly to a kind of super table of gyromagnet substrate based on metallic film antistructure
Face.
Background technology
The Fano resonance of Novel manual electromagnetic material is found in asymmetric resonant ring array first, destroys resonant element
The electromagnetic response of the symmetry of geometry, that is, controllable Novel manual electromagnetic material, the artificial structure can be defined as beam
Tie up the Novel manual electromagnetic material of mode of resonance, between resonant element strong interaction lead to the appearance of Fano resonance.Nanan
The research group of Pu Dun universities realizes electromagnetically induced Transparency Phenomenon (EIT) in microwave section using Novel manual electromagnetic material, keeps away
Many problems of the transparent research field of previous electromagnetically induced and the experiment condition of complexity are exempted from, they excite merely with double-layer structure
Fano phenomenons, it is transparent to realize electromagnetically induced.Using the Fano couplings between radiation mode and dark mould, surface plasma is new
Type artificial electromagnetic material can also show EIT phenomenons.The electromagnetically induced of terahertz wave band is transparent, the free novel people of comprehensive polarization
The work such as the Fano effects of work electromagnetic material and high-temperature superconductor Novel manual electromagnetic material are also reported successively.
There are mainly two types of the methods for breaking symmetry of artificial super surface electromagnetism Fano and the EIT response of control, and one is to beat
Broken intrinsic symmetry, one is to broken external symmetry.In recent years, various geometrical symmetry and the spatial symmetries broken
Report emerges one after another, including using split ring resonator and asymmetric metal bar dimer etc..But material itself is utilized recently
External field response characteristic realizes Broken Symmetry, breaks the time by introducing magnetic conductivity adjustable yttrium-iron-garnet material (YIG)
Inversion symmetry and spatial alternation symmetry obtain reflectance factor in conjunction with coupled mode theory equation, and by each to reflectance factor
The regulation and control of a parameter obtain controllable reflectance spectrum.Not only can be simple in structure, it is easily prepared, and geometry can not changed
In the case of parameter, it can freely regulate and control reflectivity and reflection characteristic and its one-way.
Invention content
It is in view of the deficiencies in the prior art or insufficient, the technical problem to be solved by the present invention is to：One kind is provided to carry
Go out the introducing optically activ material substrate in the surface with antistructure antenna features.This super surface is responded due to the external magnetic field of substrate
Characteristic can inspire symmetric pattern and asymmetric mode in antistructure antenna.The resonant frequency of both of which is set mutually to lean on
Closely, make the scattered field of the two that relevant effect occur, can realize the Fano line styles on reflectance spectrum.The Q value of symmetric pattern
Small, reflectance spectrum is wider, and the ability of bandreject filtering is realized in prodigious frequency range.And the Q value of asymmetric mode
Very big, reflection spectrum peak is sharp, and can obtain the bandpass filtering in very narrow frequency range.In conjunction with this metallic film with antistructure
With the dispersion relation and band theory on the super surface of gyromagnetic material substrate, give " energy band diagram " of asymmetric mode.According to " energy
With figure " it can be with the angle of inclination of flexible design incident light, to realize Q values size and the position of resonance of asymmetric mode.And
The excitation of asymmetric mode can be completely inhibited in special angle.
To achieve the goals above, the technical solution that the present invention takes is to provide a kind of rotation based on metallic film antistructure
The super surface of magnetic substrate, the super surface include npA basic cell structure, npFor the integer more than or equal to 2, the base board unit structure
Including upper layer artificial micro-structure and underlying substrate, upper layer artificial micro-structure is ultrathin paster structure, and thickness is in microwave wave
Section 1-2GHz is less than 1 millimeter, and to have fluted perfect electrical conductor material, surface has the metal foil of antistructure antenna features
Film, underlying substrate be with external magnetic field response characteristic gyromagnetic material, can inspire symmetric pattern in antistructure antenna and
Asymmetric mode keeps the resonant frequency of both of which close to each other, makes the scattered field of the two that relevant effect occur, can realize reflection
Fano line styles in spectrum.
As a further improvement on the present invention, the basic cell structure includes the identical parallel ditch of two sizes
Slot is not filled with any particular matter in groove, is air.
As a further improvement on the present invention, there are two kinds of resonance modes of symmetric form and antisymmetry type for the parallel groove.
As a further improvement on the present invention, the Q value of the symmetric form pattern is small, and spectrum is wider, very big
Frequency range in realize the ability of bandreject filtering；The Q value of the asymmetric pattern is very big, reflection spectrum peak point
It is sharp, and the bandpass filtering in very narrow frequency range can be obtained
As a further improvement on the present invention, the super surface controls gyromagnet material by changing the power of additional magnetostatic field
The self-characteristic of material can be realized by regulating and controlling magnetostatic field size with the dynamic of resistance frequency range in the case where not changing geometric dimension
State regulates and controls.
As a further improvement on the present invention, the perfect electrical conductor material is metal material, and the metal material includes
Copper, aluminium, iron.
As a further improvement on the present invention, described to have external magnetic field response characteristic gyromagnetic material for ferrite.
The beneficial effects of the invention are as follows：
1. super surface proposed by the present invention, structure is ultrathin paster structure, and thickness is less than 1 in microwave band 1-2GHz
Millimeter.Super entire surface volume is very thin, is highly suitable to be applied for small size and integrates electromagnetic device.
2. the metal due to constituting super surface proposed by the present invention is considered as perfect conductance in low-frequency band (1-2GHz)
Body, therefore the loss very little of waveguide, belong to a kind of lossless device.Transmission range of the electromagnetic wave in the waveguide is longer to be can be used as far
The guide wave device of distance.
3. super surface proposed by the present invention can control resonant position by controlling additional magnetostatic field, compared to by changing
Become for geometric dimension, it is more convenient.
4. the present invention is in addition to above-mentioned functional benefit is also equipped with, making is simple, and cost is relatively low, can simply use PCB
Processing technology is made.
Description of the drawings
Fig. 1 (a) is the super schematic surface of gyromagnet substrate based on metallic film antistructure；
Fig. 1 (b) is the cellular construction on the super surface；
It is research Babinet's principle schematic diagram in Fig. 2；
In Fig. 3 for the super surface reflectivity with impinging microwave frequency variation diagram；
It is the intensity distribution corresponding to magnetic field at two mode resonance frequencies in Fig. 4；
It is " energy band diagram " of asymmetric mode in system in Fig. 5；
Reflectivity when being special angle light incidence in Fig. 6 is with frequency variation diagram；
1 be surface micro-structure region wherein 1 and 2 is air in wherein Fig. 1 (b).
Specific implementation mode
The present invention is further described for explanation and specific implementation mode below in conjunction with the accompanying drawings.
As shown in Figure 1, the present invention proposes a kind of super surface of gyromagnet substrate super surface based on metallic film antistructure, packet
Two parts are included, upper layer is the perfect electric conductor with micro-structure, and lower layer is yttrium iron garnet, cellular construction such as attached drawing 1 (b)
It is shown.The cellular construction on the super surface known to attached drawing 1 (b) includes two grooves 1 and 2.Super surface includes np(np>=2) a base
This cellular construction, with n in attached drawing 1 (a)pFor=4.This super surface proposed by the present invention is ultrathin patch in practical applications
Chip architecture can be used simple PCB processing technologys and make.
In order to carry out some operations on reflectance spectrum, Babinet's principle is had studied first.I.e. a structure is corresponding with it
Antistructure is being transmitted and is being reflected, the relationship between electric field and magnetic field.We have found that：1. a structure, transmission when TE wave incidences
Spectrum, it is just corresponding with reflectance spectrum when its antistructure TM wave incidences；2. a structure, its eelctric dipole resonance, just and it
Antistructure magnetic dipole resonance correspond to.As shown in Figure 2.
In order to design desired artificial micro-structure, and qualitatively understand the resonance characteristics of structure, uses time domain to couple first
The theory of modules carries out analysis elaboration.The time domain coupled mode theory of resonance mode is there are two having：
Wherein, ωaFor the resonant frequency of symmetric pattern, the resonance is strong with free space coupling, causes its loss big, is bright
State (bright mode)；ωbFor the resonant frequency of asymmetric mode, since it cannot directly be excited by outfield, with free space
Coupling it is weak, loss it is low, be dark-state (dark mode).The coefficients of coup of the κ between bright state and dark-state is a plural number.A, b and
SinE is expressed as the dependence of timeiωt.Also, a, b and SinAmplitude be all reduction value, α characterization outfield be coupled into it is bright
The damped coefficient of state.Because dark-state cannot directly by outer field excitation, so be 0.
Abbreviation formula (1) obtains：
Therefore, the reflectance factor of the system can be obtained by solution (2).
It can be seen from (3) formula in the case where the resonant frequency of both of which determines, coefficient of coup κ can determine to reflect
Characteristic.
We provide a specific case study on implementation in conjunction with attached drawing 3 below.The length l of substrate thickness h=8.75mm, groove
=24.5mm, width w=3.5mm.Material is set as air in region 1 and 2, and other materials is considered perfect electric conductor.Attached drawing 3
For the super surface obtained by FDTD methods under the size reflectivity with frequency variation.As we can see from the figure in very big frequency range
Band resistance range in, have one section of narrow passband (near 6.502GHz).
For a further understanding of the comprehensive function of YIG and oblique incidence microwave, we calculate asymmetric mould in the system
" energy band diagram " (attached drawing 5) of formula.It was found that asymmetric mode resonant frequency and Q values size can with impinging microwave angle of inclination and
Variation, and exist a bit, the Q values diverging (tending to be infinitely great) of asymmetric mode.In order to study the unusual appearance of divergence point, we
Find out the corresponding k of divergence pointxNumerical value is -0.18367.According to formula kx=ksin θ=ω sin θs/c, can be in the hope of corresponding at this time
Incidence angle be θ=- 28.4 °.When control incident light angle is θ=- 28.4 °, 0 °, 28.4 °, utilizes full-wave electromagnetic to emulate and count
It calculates, acquires the reflectance spectrum (attached drawing 6) of three angles respectively.
When as a result showing that incident angle is θ=- 28.4 °, reflectance spectrum is a smooth line, does not occur Fano lines
Type.The phenomenon that divergence point, matches in this " energy band diagram " for being calculated with attached drawing 5.In this Frequency point, gyromagnetic material substrate draws
The symmetry breaking and impinging microwave entered, which tilts caused symmetry breaking, realizes counteracting, to completely inhibit asymmetric mode
Excitation.The system may be used as sensitive angle detection due to very sharp peak and its one-way.
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be said that
The specific implementation of the present invention is confined to these explanations.For those of ordinary skill in the art to which the present invention belongs, exist
Under the premise of not departing from present inventive concept, a number of simple deductions or replacements can also be made, all shall be regarded as belonging to the present invention's
Protection domain.
Claims (6)
1. a kind of super surface of gyromagnet substrate based on metallic film antistructure, it is characterised in that：The super surface includes npIt is a basic
Cellular construction, npFor the integer more than or equal to 2, the basic cell structure includes upper layer artificial micro-structure and underlying substrate,
Its upper layer artificial micro-structure is ultrathin paster structure, and thickness is less than 1 millimeter in microwave band 1-2 GHz, for groove
Perfect electrical conductor material, surface have antistructure antenna features metallic film, underlying substrate be with external magnetic field ring
Characteristic gyromagnetic material is answered, symmetric pattern and asymmetric mode in antistructure antenna can be inspired, make the resonance of both of which
Frequency is close to each other, makes the scattered field of the two that relevant effect occur, can realize the Fano line styles on reflectance spectrum；
The basic cell structure includes two identical parallel grooves of size, and any particular matter is not filled in groove,
For air.
2. the gyromagnet substrate super surface according to claim 1 based on metallic film antistructure, it is characterised in that：It is described flat
There are two kinds of resonance modes of symmetric form and antisymmetry type for row groove.
3. the gyromagnet substrate super surface according to claim 2 based on metallic film antistructure, it is characterised in that：It is described right
Claim the Q value of pattern formula small, reflectance spectrum is wider, and the ability of bandreject filtering is realized in prodigious frequency range；It is described
The Q value of asymmetric pattern is very big, and reflection spectrum peak is sharp, and can obtain the bandpass filtering in very narrow frequency range.
4. the gyromagnet substrate super surface according to claim 3 based on metallic film antistructure, it is characterised in that：It is described super
Surface controls the self-characteristic of gyromagnetic material by changing the power of additional magnetostatic field, can be in the feelings for not changing geometric dimension
Under condition, the dynamic regulation with resistance frequency range is realized by regulating and controlling magnetostatic field size.
5. the gyromagnet substrate super surface according to claim 4 based on metallic film antistructure, it is characterised in that：It is described complete
U.S. electrical conductor material is metal material, and the metal material includes copper, aluminium, iron.
6. the gyromagnet substrate super surface according to claim 5 based on metallic film antistructure, it is characterised in that：The tool
It is ferrite to have external magnetic field response characteristic gyromagnetic material.
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| CN108346858B (en) * | 2018-02-11 | 2020-08-25 | 苏州大学 | Method, device and equipment for controlling scattering directivity of nonlinear nano antenna |
| CN108832302B (en) * | 2018-05-03 | 2021-01-05 | 西安电子科技大学 | Double-frequency double-radiation-direction phase gradient super-surface system |
| CN109059971B (en) * | 2018-09-25 | 2024-04-30 | 桂林电子科技大学 | Sensor with three-hole seam structure |
| CN109581700B (en) * | 2018-12-04 | 2022-07-29 | 上海师范大学 | Terahertz modulator based on indium antimonide strip microstructure and preparation method thereof |
| CN109921193B (en) * | 2019-03-14 | 2021-06-25 | 南京邮电大学 | Double-peak electromagnetic induction transparent device and method based on two coupling modes |
| CN113589522B (en) * | 2021-06-30 | 2023-03-21 | 武汉大学 | Angle multiplexing super surface based on building structure parameter library and design method |
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| CN102790283A (en) * | 2012-07-24 | 2012-11-21 | 电子科技大学 | Adjustable three-frequency negative permeability metamaterial based on ferrimagnetics and manufacturing method thereof |
| CN103296452A (en) * | 2012-02-29 | 2013-09-11 | 深圳光启创新技术有限公司 | Selective wave-transparent metamaterial and antenna housing |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103296452A (en) * | 2012-02-29 | 2013-09-11 | 深圳光启创新技术有限公司 | Selective wave-transparent metamaterial and antenna housing |
| CN102790283A (en) * | 2012-07-24 | 2012-11-21 | 电子科技大学 | Adjustable three-frequency negative permeability metamaterial based on ferrimagnetics and manufacturing method thereof |
Non-Patent Citations (1)
| Title |
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| 表面等离子激元超表面结构的光学传输特性研究;李瑞彬;《中国优秀硕士学位论文全文数据库》;20160215;第I、II页、第32页，图4.1 * |
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