CN1835277A - Negative refracting power microwave medium material and prepn. method thereof - Google Patents
Negative refracting power microwave medium material and prepn. method thereof Download PDFInfo
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- CN1835277A CN1835277A CN 200610020630 CN200610020630A CN1835277A CN 1835277 A CN1835277 A CN 1835277A CN 200610020630 CN200610020630 CN 200610020630 CN 200610020630 A CN200610020630 A CN 200610020630A CN 1835277 A CN1835277 A CN 1835277A
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- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/002—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of materials engineered to provide properties not available in nature, e.g. metamaterials
- G02B1/007—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of materials engineered to provide properties not available in nature, e.g. metamaterials made of negative effective refractive index materials
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- 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
Abstract
The disclosed material is composed of single insulation type ferromagnetic material in negative magnetic permeability or insulation type ferrous magnetic material and metal conductor wire. The said metal conductor wire is embedded into the said single insulation type ferromagnetic material or insulation type ferrous magnetic material evenly. Based on array of metal wire, the invention supplies three kinds of materials in negative refractive index: 1D lattice, 2D lattice, and 3D lattice. Media in negative index are produced by superposing single insulation type ferromagnetic material in negative magnetic permeability or insulation type ferrous magnetic material in broadband with array structure of metal wire in broadband single negative dielectric constant. Features are: wide working frequency, changeable refractive index by applied adjust and control magnetic field, simple preparation method and using mature technologies.
Description
Technical field
A kind of negative refracting power microwave medium material and preparation method thereof belongs to the microwave material technical field.
Background technology
All right and wrong are simultaneously for what bear in whole electromagnetic spectrum for the dielectric constant of occurring in nature natural materials and the real part of magnetic permeability, and the real part of its refractive index is a positive number.Up to now, occurring in nature does not find that as yet dielectric constant and magnetic permeability are the natural material of negative value simultaneously.
1964, the scientist V.G.Veselago of the former Soviet Union is at " The electrodynamics of substances withsimultaneously negative values of ε and μ " (Soviet Physics Uspekhi, Vol.10, No.4, pp509-514, Apr 1968) in the literary composition theory analysis electromagnetic wave be electrodynamics behavior in the isotropism homogeneous medium of negative simultaneously at imaginary dielectric constant and magnetic permeability, the mutual effect of prediction electromagnetic wave and this imaginary material will produce very special transmission/refraction/reflection characteristic: electromagnetic wave electric field in (1) imaginary material, become the left hand relation between magnetic field and the propagation wave vector three, electromagnetic wave phase velocity direction and energy fast direction opposite (as shown in Figure 1); (2) contrary refraction effect (Reversed Snell Refraction) taking place during the interface of electromagnetic wave by imaginary material and positive refracting power material, produces negative electricity magnetic wave pressure on the interface; (3) reverse Doppler effect (Reversed Doppler Effect); (4) contrary Qie Lunkefu radiation (Reversed CerenkovRadiation); (5) imaginary material flat boards have desired electrical magnetic imaging ability.Veselago claims that this imaginary material is " left-handed materials " (Left-Handed Material), existing academia also is defined as two negative materials (Double NegativeMaterials-DNM), negative refractive index material (Negative Index of Refraction Materials-NIRM), backward wave material (Backward Wave Materials-BWM), incorgruous medium (Metamaterial) etc., the present invention adopts negative refractive index material (NIRM) definition, to emphasize the refractive index characteristics of material.
1998, people such as J.Pendry are at " Low frequency plasmons in thin-wire structures " (J.Phys.:Condens.Matter., Vol.10, pp4785-4809,1998.) propose in the literary composition: for the metallic conductor line being the lattice-type macroscopic view array (as shown in Figure 2) that the unit was constituted, less than metallic conductor line plasma frequency f
pElectromagnetic spectrum in, its effective dielectric constant ε
Eff(f) for negative.
Physical structure as shown in Figure 3, it is formed by the polystyrene thin plate of 3 millimeters thick is staggered, is equipped with 5 millimeters parallel metal linear array apart on the thin plate, metal wire is the gold-plated tungsten line of 20 microns of diameters.Thereby the cell of these thin plates staggered stack formation 5mm * 5mm * 6mm, the device whole dimension is: 200mm * 200mm * 120mm (as Fig. 4).Each layer revolves and turn 90 degrees stack, thereby has been built into a three-dimensional structure.This structure can change metal wire density by adding blanket layer between each layer, thereby changes its plasma frequency.
1999, people such as J.Pendry are at " Magnetism from conductors and enhanced nonlinearphenomena " (IEEE Trans.Microwave Theory Tech., Vol.47, No.11, pp2075-2084, Nov1999.) propose again in the literary composition: for being the lattice-type macroscopic view array (as shown in Figure 6) that the unit was constituted with bimetallic resonant ring (as shown in Figure 5), in electromagnetic spectrum greater than the becket resonance frequency, its equivalent permeability μ
Eff(f) for negative.
2000, the structure list negative permittivity medium that people such as D.R.Smith propose based on J.B.Pendry, the thought of single negative magnetoconductivity medium, manually synthesize first at X-band effective dielectric constant and equivalent permeability and be negative negative refracting power microwave medium (as shown in Figure 7) simultaneously, and negative refraction (experimental provision as shown in Figure 8) has taken place during the interface of the electromagnetic wave of observing X-band in next year in experiment by this artificial synthetic medium and air really.Subsequently, the C.G.Parazzoli of G.V.Eleftheriades of University of Toronto and seattle, u.s.a Boeing Phantom Works two groups of researchers of leader delivered respectively at the microwave band material with negative refractive index laboratory report of (as shown in Figure 9), they have directly observed the contrary Qie Lunkefu radiation and the negative refraction of material with negative refractive index in experiment, further confirmed the existence of negative refractive index material, also shown manually to synthesize negative refracting power microwave medium.
At present, the research of NIRM has become international physics and electromagnetism educational circles field, a very noticeable forward position, numerous scholars are to the NIRM manufacture method, and the propagation characteristic of electromagnetic wave in NIRM, scattering properties etc. have been carried out more deep research, have produced many new achievements.Electromagnetic wave has unique electromagnetic property in NIRM, determined it having a wide range of applications aspect military and civilian two.NIRM can be used for making high degree of orientation antenna, realizes perfect lens, focuses on electromagnetic wave beam, makes novel optical components such as huge capacity compact discs.The research focus of NIRM research field mainly contains: (1) continues perfect in theory, strives the various electromagnetic propertys and the phenomenon that exist in the best explain NIRM field; (2) explore new method synthesizing stable, broadband, low-loss, tunable NIRM, so that obtain wider application in practice; (3) utilize nanometer technology and integrated circuit to realize the NIRM miniaturization, to promote its operation wavelength to millimeter wave, the light-wave band development.
Up to now, the method of artificial synthetic NIRM mainly contains three kinds: (1) is the lattice-type macroscopic view array structure that elementary cell constitutes by metallic conductor line and the equitant micro-structural of metal resonant ring, its basic thought is that effective dielectric constant is the two mutual superposition spatially of negative monometallic resonant ring array macrostructure for negative monometallic conductor lines array macrostructure and equivalent permeability, and the equivalent refractive index of the composite construction of formation is to bear for negative electromagnetic wave frequency range and equivalent permeability at effective dielectric constant in for the negative equitant spectral domain of electromagnetic wave frequency range; (2) one dimension, two dimension or the cubical array structure that constitutes by series capacitance and shunt inductance high pass transmission line elementary cell, its basic thought is with conventional low pass transmission line elementary cell---the connected mode antithesis exchange of series inductance and shunt capacitance, the series capacitance of generation and shunt inductance are that the effective dielectric constant and the equivalent permeability of the high pass transmission line of elementary cell is negative simultaneously; (3) photonic crystal, by the artificial material that two or more dielectric substance periodic arrangement forms, the arrangement cycle is a wavelength magnitude, has the photoconduction band gap, thereby the propagation therein of control electromagnetic wave, under certain condition, photonic crystal shows the negative index characteristic.There is complex structure in above-mentioned first method, is difficult to processing, and working band is narrower, should not be generalized to shortcomings such as optical band.Second method need load lamped element, is not suitable for high frequencies such as millimeter wave, Terahertz, infrared band and uses.The third method requires to satisfy Bragg scattering condition, makes its processing and practical application difficulty, all is more scabrous problem as anisotropy, Mode Coupling mismatch and high order diffraction; Because its operation wavelength and arrangement cycle, its application aspect device miniaturization also had significant limitation in same constant level.Therefore, the new method of exploration and the artificial synthetic NIRM of development has important scientific meaning and practical value.
Summary of the invention
The invention provides a kind of negative refracting power microwave medium material and preparation method thereof, wideer, the stable performance of the operating frequency of described negative refracting power microwave medium material; Described preparation method is simple.
Basic thought of the present invention is as follows:
Some natural materials of occurring in nature, as metal and plasma, for the electromagnetic wave that frequency is lower than its plasma frequency, its dielectric constant shows as negative value; Ferromagnetic material and ferrimagnetic material, under the static magnetic field effect outside, for frequency in the ferro resonance frequency of ferromagnetic material to the electromagnetic wave between the anti-ferro resonance frequency, its magnetic permeability is a negative value.If in the basis material of single negative permittivity, embed metalloid resonant ring array, or in the basis material of single negative magnetoconductivity, embed metalloid conductor lines array, the compound medium that constitutes might its effective dielectric constant, equivalent permeability be negative in wide electromagnetic wave frequency range simultaneously, thereby can manually synthesize wide-band microwave NIRM.
Detailed technology scheme of the present invention is:
A kind of negative refracting power microwave medium material, form by the insulated type ferromagnetic material of single negative magnetoconductivity or insulated type ferrimagnetic material and plain conductor, it is characterized in that described plain conductor evenly embeds in the insulated type ferromagnetic material or insulated type ferrimagnetic material of single negative magnetoconductivity.
The insulated type ferromagnetic material of the single negative magnetoconductivity of described even embedding or the plain conductor in the insulated type ferrimagnetic material constitute line array (as shown in figure 10).
The insulated type ferromagnetic material or the plain conductor in the insulated type ferrimagnetic material of the single negative magnetoconductivity of described even embedding constitute planar array (as shown in figure 11).
The insulated type ferromagnetic material or the plain conductor in the insulated type ferrimagnetic material of the single negative magnetoconductivity of described even embedding constitute stereo grid shaped array (as shown in figure 12).
The insulated type ferromagnetic material of the single negative magnetoconductivity of described even embedding or the plain conductor in the insulated type ferrimagnetic material can be the cylindrical metal leads, also can be the micro stripline plain conductor.
The insulated type ferromagnetic material of the single negative magnetoconductivity of described even embedding or the sectional dimension of the plain conductor in the insulated type ferrimagnetic material are in the submillimeter magnitude; The array spacings size is in the millimeter magnitude.
A kind of preparation method of negative refracting power microwave medium material is characterized in that, it may further comprise the steps:
The YIG class insulated type ferromagnetic material substrate of step 1 preparation suitable thickness.
Step 3 with the deposition of step 2 gained the overlapping accumulation multilayer of YIG class insulated type ferromagnetic material substrate of one dimensional lattice type metal micro-strip line linear array, can obtain linear array of the present invention (one dimensional lattice type) plain conductor negative refracting power microwave medium material (as shown in figure 10).
A kind of preparation method of negative refracting power microwave medium material is characterized in that, it may further comprise the steps:
The YIG class insulated type ferromagnetic material substrate of step 1 preparation suitable thickness.
Step 3 with the deposition of step 2 gained the overlapping accumulation multilayer of YIG class insulated type ferromagnetic material substrate of two-dimensional crystal lattice type metal micro-strip line face battle array, can obtain of the present invention battle array (two-dimensional crystal lattice type) plain conductor negative refracting power microwave medium material (as shown in figure 11).
A kind of preparation method of negative refracting power microwave medium material is characterized in that, it may further comprise the steps:
The YIG class insulated type ferromagnetic material substrate of step 1 preparation suitable thickness.
Step 3 with the deposition of step 2 gained the overlapping accumulation multilayer of YIG class insulated type ferromagnetic material substrate of two-dimensional crystal lattice type metal micro-strip line face battle array, in the process of piling up, at all through hole depositions metal material identical, can obtain stereoscopic grid battle array of the present invention (three-dimensional lattice type) plain conductor negative refracting power microwave medium material (as shown in figure 12) with metal micro-strip line.
Essence of the present invention is that be the plain conductor array structure of the single negative permittivity in broadband with on the microcosmic being on the insulated type ferromagnetic material of the single negative magnetoconductivity in broadband or insulated type ferrimagnetic material and the macroscopic view, and the two is spatially overlapped, constitutes compound medium.Its equivalent refractive index will be to be negative simultaneously in the equitant spectral domain of bearing of electromagnetic wave frequency range for electromagnetic wave frequency range and the equivalent permeability of bearing at effective dielectric constant, thereby manually synthesize NIRM.
Size by the regulation and control externally-applied magnetic field, the effective dielectric constant of adjustable this composite material and equivalent permeability, thereby the refractive index of material is changed with the variation that adds regulation and control magnetic field, and simultaneously, the transmission/refraction/scattering/electromagnetic propertys such as Doppler effect of material also change thereupon.After metal object surface is wrapped up in this kind NIRM, by the regulation and control externally-applied magnetic field, then can regulate and control the RCS (RCS) and the Doppler frequency shift of object thereupon, thereby hew out the new way of the RCS and the Doppler frequency shift of a Based Intelligent Control target object, it has important scientific meaning and practical value in military civil areas such as radar countermeasures, the back scattering type RFID prospect that will have a very wide range of applications.
The invention has the beneficial effects as follows:
1, negative refractive index material material of the present invention, its operating frequency is wideer than existing refractive index medium material;
2, negative refractive index material material of the present invention, its refractive index can change with the size that adds regulation and control magnetic field;
3, negative refractive index material material of the present invention has wider application prospect;
4, negative refractive index material preparation methods of the present invention is simple, and used every technology is existing mature technology.
Description of drawings
Fig. 1 is that the left hand between electromagnetic wave electric field, magnetic field and the propagation wave vector three concerns schematic diagram, and wherein, S is the Poynting vector of representative energy position, and k is the wave vector of representative phase velocity direction, and the two direction is opposite.
Fig. 2 is a metallic conductor linear array structure schematic diagram.
Fig. 3 is the physical structure schematic diagram of negative permittivity material.
Fig. 4 is the photo in kind of negative permittivity Material Physics structure shown in Figure 3.
Fig. 5 is a single metal resonant ring structural representation.
Fig. 6 is the material with negative refractive index structural representation with metal resonant ring.
Fig. 7 is the photo in kind with material with negative refractive index of metal resonant ring.
Fig. 8 is a negative index experiment test device.Sample (prism) places between two absorbing materials; Thick black arrow is represented arrival bearing and refraction (pressing n＞0) direction; Detector is the microwave power measurement device that connects with the waveguide of X frequency range, is actually with waveguide-coaxial converter and HP8756A type scalar network analyzer.
Fig. 9 is the photo in kind two with material with negative refractive index of metal resonant ring.
Figure 10 is the material with negative refractive index structural representation with one dimensional lattice type metal conduction band array structure of the present invention.
Figure 11 is the material with negative refractive index structural representation with two-dimensional crystal lattice type metal conduction band array structure of the present invention.
Figure 12 is the material with negative refractive index structural representation with three-dimensional lattice type metal conduction band array structure of the present invention.
The equivalent electric magnetic characteristic of Figure 13,14 negative refractive index material material of the present invention that is electromagnetic wave when propagating perpendicular to the direction of magnetization, wherein, Figure 13 is the effective dielectric constant frequency response characteristic, Figure 14 is the equivalent permeability frequency response characteristic.
Figure 15 is the Electromagnetic Simulation model schematic diagram of independent ferrimagnetic material-YIG.
Figure 16 electromagnetic transmission coefficient simulation result schematic diagram that is electromagnetic wave when in YIG, propagating perpendicular to the direction of magnetization.
Figure 17 is the propagation characteristic simulation result schematic diagram of electromagnetic wave in homogeneous medium (relative dielectric constant is 12.7) embedded metal conductor belt array structure.
Figure 18 is electromagnetic wave embedded propagation characteristic schematic diagram (the electromagnetic wave propagation direction is perpendicular to the direction of magnetization) in the compound medium of metallic conductor band array structure in ferrimagnetic material-YIG.
Figure 19 is the simulation model schematic diagram of the refracting characteristic of the compound medium of electromagnetic wave embedded metallic conductor band array structure in ferrimagnetic material-YIG and positive refracting power medium interface.
Figure 20 is the simulation result schematic diagram (direction of arrow is represented energy position among the figure) of electromagnetic wave refracting characteristic in two kinds of medium juncture areas shown in Figure 19.
Embodiment
The situation that is embedded among the matrix YIG with the thin metallic conductor linear array structure of three-dimensional is an example, specifies related content of the present invention.
In order to verify feasibility based on the negative refraction microwave medium synthetic method of ferrimagnetic material, can on microcosmic, realize the negative value magnetic permeability according to YIG, 3-dimensional metal conductor lines array structure is realized the principle of negative permittivity on macroscopic view, utilize the theoretical numerical value of active medium to calculate the frequency response characteristic of the effective dielectric constant and the equivalent permeability of compound medium.
Because the volume of conductor lines array structure can adopt Maxwell-Garnett active medium theoretical model much smaller than the volume of YIG:
Wherein, f
a, ε
a, μ
aBe respectively volume fraction, dielectric constant and the magnetic permeability of medium A, f
a＜＜1; ε
b, μ
bBe respectively dielectric constant and the magnetic permeability of medium B; ε, μ are respectively the effective dielectric constant and the equivalent permeability of compound medium.
The Maxwell-Garnett model is suitable for the synthetic of spherical particle, but the Drude model of metal utilizes the electromagnetic property of the compound medium of embedded 3-dimensional metal conductor lines array structure among this model qualitative analysis YIG to be fit in theory with experiment showed.
Suppose that medium A is a 3-dimensional metal conductor lines array structure, physical parameter setting is a=3.5mm, r=0.25mm.Medium B is YIG, and physical parameter as previously mentioned.So, we obtain following analytic expression
When propagated perpendicular to the direction of magnetization on the electromagnetic wave edge, the equivalent permeability that is obtained intrinsic ripple I correspondence among the YIG by formula (2) was
According to the aforementioned parameters setting, with ε
a, μ
a, f
a, ε
bAnd ε
rAnd the numerical result of (2) substitution formula (1) is shown in Figure 13,14.There are the overlapping region of C-band wave frequency in contrast Figure 13 and Figure 14 as can be known, make that the equivalent permeability of compound medium and effective dielectric constant are negative simultaneously.When the electromagnetic wave edge is parallel to direction of magnetization propagation, there is the overlapping region of C-band wave frequency equally, makes that the equivalent permeability of compound medium and effective dielectric constant are negative simultaneously.
Therefore, the method of the synthetic NIRM of embedded metal conductor lines array structure is feasible in theory in ferrimagnetic material-YIG, the real electromagnetic property of this compound medium also needs to verify by experiment, but preliminary numerical analysis result provides the useful guide effect for the artificial synthetic design NIRM that reaches.
In order to obtain the rigorous numerical result of calculation and the Electromagnetic Simulation result accurately that tries one's best, thereby further checking is based on the characteristic of the negative refraction microwave medium material of ferrimagnetic material, it is matrix that the present invention utilizes time domain finite integral method 3 D electromagnetic simulated program (3 D electromagnetic field emulation business software CST Microwave Studio) to simulate with YIG, embed electromagnetic transmission characteristic in the compound medium that effective dielectric constant constituted for negative metallic conductor linear array therein, electromagnetic wave is at the refracting characteristic at compound medium and positive refracting power medium interface place.
1 propagation properties emulation
For the ease of relatively, we respectively to independent ferrimagnetic material-YIG, independent metallic conductor band array structure and YIG embedded the composite construction of metallic conductor linear array carried out emulation.Here only consider the situation when propagate perpendicular to the direction of magnetization on the electromagnetic wave edge.
1.1 the electromagnetic property emulation of ferrimagnetic material-YIG separately
Simulation model as shown in figure 15, YIG three-dimensional dimension X, Y, Z are respectively 24mm, 4mm and 40mm, YIG is set is adding magnetic field H
0Under=1200 oersted effects, its saturation magnetization M
0=1750 Gausses, relative dielectric constant ε
r=12.7, ferro resonance live width Δ H=300 Gauss, externally-applied magnetic field H
0Along Z-direction.The relative dielectric constant of YIG two ends uniform dielectric is 12.7, and relative permeability is 1.X, Y direction boundary condition all are set to electric wall (tangential electric field is zero), and Z direction boundary condition is open waveguide.Starting point Zmin place on the Z direction and terminal point Zmax place are set to excitation port 1 and port 2 respectively.
Simulation result as shown in figure 16.Electromagnetic wave all is lower than-40dB at the transmission coefficient of 3.89-8.33GHz frequency range as can be seen from Fig. 16, the incident electromagnetic wave that shows this frequency range is subjected to seriously decaying and can not passing through in YIG, this frequency range is the propagation forbidden band of electromagnetic wave in YIG, that is to say that the YIG equivalent permeability is negative frequency band.
1.2 the electromagnetic property emulation of metallic conductor band array macrostructure separately
Metallic conductor linear array macrostructure as shown in Figure 7, for the ease of processing, the metallic conductor line adopts square banded structure, the cross sectional dimensions of single conductor belt is 0.30mm * 0.30mm, length is 4.0mm, array cycle a=4.0mm.Simulation parameters, boundary condition and excitation of electromagnetic wave setting are identical with the model of Figure 15, just YIG are wherein replaced with the metallic conductor linear array structure.For fear of spatial dispersion, the plane wave direction of an electric field of incident is parallel to the conductor belt direction.Be provided with that the relative dielectric constant of medium is 12.7 around the conductor lines, relative permeability is 1.Simulation result as shown in figure 17.All be lower than at the transmission coefficient of 7.02-9.80GHz frequency range-30dB from Figure 17 electromagnetic visual, the incident electromagnetic wave that shows this frequency range is decayed in metallic conductor band array structure and can not be passed through, and this frequency range is electromagnetic wave propagation forbidden band therein.According to former theoretical analysis, the effective dielectric constant of this metallic conductor band array structure is a negative value in frequency 7.02-9.80GHz scope.
1.3YIG in the electromagnetic property emulation of compound medium of embedded metallic conductor band array structure
The structural model of the artificial compound medium that synthesizes as shown in figure 10.For the ease of the processing of compound medium, the metallic conductor line adopts square banded structure, and its three-dimensional dimension X, Y and Z are respectively 0.3mm, 4.0mm and 0.3mm.Be limited to the grid number that calculator memory and software allow, under the prerequisite that guarantees simulation accuracy, only simulated the situation of embedded one dimension conductor lines array among the YIG.
Simulation parameters, boundary condition and excitation of electromagnetic wave setting are identical with the described model of Figure 15, and just general YIG wherein replaces with compound medium as shown in figure 10.YIG and metal wire physical parameter are as previously mentioned.In emulation, compound medium is not in contact with one another with Y direction electricity wall, and at a distance of being 1mm, the centre is that dielectric constant is 12.7, and magnetic permeability is 1 uniform dielectric.
Among the YIG in the compound medium of embedded metal conductor belt array structure the simulation result of electromagnetic transmission characteristic as shown in figure 18, the transmission coefficient peak value is-20.15dB as seen from the figure, is positioned at frequency 8.13GHz place, three dB bandwidth is 7.51-8.65GHz.The transmission coefficient of compound medium has improved more than the 40dB with comparing with the transmission coefficient of frequency range list YIG in this frequency range, compare with the transmission coefficient of monometallic conductor belt array structure and to have improved more than the 20dB, therefore can think the electromagnetic wave propagation passband of frequency band 7.51-8.65GHz for this compound medium.Passband is positioned at the overlapping region in Figure 16 and forbidden band shown in Figure 17, and according to aforementioned theory analysis, this compound medium equivalent refractive index should be negative value in this passband.
2 electromagnetic waves are in the refracting characteristic emulation of two kinds of medium interface
For the checking in above-mentioned passband the equivalent refractive index of compound medium whether be negative, emulation of the present invention the refracting characteristic of incident electromagnetic wave at compound medium and positive refracting power medium interface place.
The compound medium physical model of wedge shape as shown in figure 19, embedded square metal conductor belt among the YIG, YIG is identical with aforementioned (as shown in figure 15) model with the conductor belt physical parameter.X, Y direction are the open boundary condition, and the Z direction is electric wall, are actuated to the plane wave of propagating along the Y-axis positive direction.
Operating frequency be 8.13GHz electromagnetic wave at the power circuit directional diagram of compound medium and positive refracting power medium juncture area as shown in figure 20.As seen at the interface of two kinds of mediums, the transmitted wave energy shows negative refraction has taken place to the same side of incident wave normal deflection (shown in arrow among the figure) from Figure 20.Further analogue simulation shows that in the passband of 7.51-8.13GHz, electromagnetic wave still negative refraction can take place at the interface place of two kinds of mediums, but conventional positive refraction phenomenon then can take place in greater than the passband of 8.13GHz gradually.Thereby proved conclusively in the passband of 7.51-8.13GHz, the equivalent refractive index of compound medium is for negative, the effective dielectric constant that this frequency range is positioned at cycle conductor lines array macrostructure is negative 7.02-9.80GHz frequency band and the 5.22-8.14GHz frequency band equitant frequency spectrum of matrix YIG equivalent permeability for bearing, and shows that negative refractive index material material that the present invention proposes and preparation method thereof is effective and feasible.
Claims (9)
1, a kind of negative refracting power microwave medium material, form by the insulated type ferromagnetic material of single negative magnetoconductivity or insulated type ferrimagnetic material and plain conductor, it is characterized in that described plain conductor evenly embeds in the insulated type ferromagnetic material or insulated type ferrimagnetic material of single negative magnetoconductivity.
2, a kind of negative refracting power microwave medium material according to claim 1 is characterized in that, the insulated type ferromagnetic material of the single negative magnetoconductivity of described even embedding or the plain conductor in the insulated type ferrimagnetic material constitute line array.
3, a kind of negative refracting power microwave medium material according to claim 1 is characterized in that, the insulated type ferromagnetic material of the single negative magnetoconductivity of described even embedding or the plain conductor in the insulated type ferrimagnetic material constitute planar array.
4, a kind of negative refracting power microwave medium material according to claim 1 is characterized in that, the insulated type ferromagnetic material of the single negative magnetoconductivity of described even embedding or the plain conductor in the insulated type ferrimagnetic material constitute stereo grid shaped array.
5, according to claim 1,2,3 or 4 described a kind of negative refracting power microwave medium materials, it is characterized in that the insulated type ferromagnetic material of the single negative magnetoconductivity of described even embedding or the plain conductor in the insulated type ferrimagnetic material can be the cylindrical metal leads, also can be the micro stripline plain conductor.
According to claim 1,2,3 or 4 described a kind of negative refracting power microwave medium materials, it is characterized in that 6, the insulated type ferromagnetic material of the single negative magnetoconductivity of described even embedding or the sectional dimension of the plain conductor in the insulated type ferrimagnetic material are in the submillimeter magnitude; The array spacings size is in the millimeter magnitude.
7, a kind of preparation method of negative refracting power microwave medium material is characterized in that, it may further comprise the steps:
The YIG class insulated type ferromagnetic material substrate of step 1 preparation suitable thickness;
Step 2 goes out one dimensional lattice type metal micro-strip line linear array at the surface deposition of the YIG of step 1 gained class insulated type ferromagnetic material substrate;
Step 3 with the deposition of step 2 gained the overlapping accumulation multilayer of YIG class insulated type ferromagnetic material substrate of one dimensional lattice type metal micro-strip line linear array, can obtain linear array of the present invention (one dimensional lattice type) plain conductor negative refracting power microwave medium material.
8, a kind of preparation method of negative refracting power microwave medium material is characterized in that, it may further comprise the steps:
The YIG class insulated type ferromagnetic material substrate of step 1 preparation suitable thickness;
Step 2 goes out two-dimensional crystal lattice type metal micro-strip line face battle array at the surface deposition of the YIG of step 1 gained class insulated type ferromagnetic material substrate;
Step 3 with the deposition of step 2 gained the overlapping accumulation multilayer of YIG class insulated type ferromagnetic material substrate of two-dimensional crystal lattice type metal micro-strip line face battle array, can obtain of the present invention battle array (two-dimensional crystal lattice type) plain conductor negative refracting power microwave medium material.
9, a kind of preparation method of negative refracting power microwave medium material is characterized in that, it may further comprise the steps:
The YIG class insulated type ferromagnetic material substrate of step 1 preparation suitable thickness;
Step 2 goes out two-dimensional crystal lattice type metal micro-strip line face battle array at the surface deposition of the YIG of step 1 gained class insulated type ferromagnetic material substrate; And a through hole is made a call in the place of all two-dimensional crystal lattice points on substrate, and the size of through hole is of a size of suitable to be slightly less than metal micro-strip line;
Step 3 with the deposition of step 2 gained the overlapping accumulation multilayer of YIG class insulated type ferromagnetic material substrate of two-dimensional crystal lattice type metal micro-strip line face battle array, in the process of piling up, at all through hole depositions metal material identical, can obtain stereoscopic grid battle array of the present invention (three-dimensional lattice type) plain conductor negative refracting power microwave medium material with metal micro-strip line.
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| CN102570048A (en) * | 2011-12-26 | 2012-07-11 | 深圳光启高等理工研究院 | Metamaterial with three dimensional microstructure and manufacturing method of same |
| CN101494310B (en) * | 2008-11-27 | 2012-08-29 | 电子科技大学 | Tunable microwave material with negative refractive index |
| CN102684608A (en) * | 2011-03-18 | 2012-09-19 | 深圳光启高等理工研究院 | Any-impedance artificially synthetic material and design method thereof |
| 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 |
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| CN101494310B (en) * | 2008-11-27 | 2012-08-29 | 电子科技大学 | Tunable microwave material with negative refractive index |
| CN101765358B (en) * | 2008-12-25 | 2012-05-30 | 西北工业大学 | Meta-material absorber based on dendritic structure |
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| CN102684608B (en) * | 2011-03-18 | 2015-05-20 | 深圳光启高等理工研究院 | Any-impedance artificially synthetic material and design method thereof |
| CN102684608A (en) * | 2011-03-18 | 2012-09-19 | 深圳光启高等理工研究院 | Any-impedance artificially synthetic material and design method thereof |
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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 |
| CN102856663A (en) * | 2012-08-24 | 2013-01-02 | 电子科技大学 | Metamaterial, broadband and infrared wave-absorbing structural material |
| CN104570163A (en) * | 2013-10-14 | 2015-04-29 | 张一聪 | Special artificial material for refracting electromagnetic waves |
| CN108808183A (en) * | 2018-06-08 | 2018-11-13 | 合肥工业大学 | A kind of terahertz filter based on taper metamaterial unit |
| CN113394567A (en) * | 2021-06-23 | 2021-09-14 | 西安电子科技大学 | High-directivity dual-function lens antenna based on two-dimensional metal wire network |
| CN113555653A (en) * | 2021-09-18 | 2021-10-26 | 成都威频科技有限公司 | High-rejection band-pass filter |
| CN114361752A (en) * | 2021-11-29 | 2022-04-15 | 北京仿真中心 | Broadband beam synthesizer with gradient-changing dielectric constant |
| CN115966878A (en) * | 2023-03-09 | 2023-04-14 | 成都威频科技有限公司 | Double-sided coupling YIG thin film resonator |
| CN115966878B (en) * | 2023-03-09 | 2023-07-28 | 成都威频科技有限公司 | Double-sided coupling YIG thin film resonator |
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