CN102790283A - Adjustable three-frequency negative permeability metamaterial based on ferrimagnetics and manufacturing method thereof - Google Patents
Adjustable three-frequency negative permeability metamaterial based on ferrimagnetics and manufacturing method thereof Download PDFInfo
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Abstract
The invention relates to an adjustable three-frequency negative permeability metamaterial based on a ferrimagnet and a manufacturing method thereof, and belongs to the technical field of microwave materials. The material is formed by a ferrimagnet and a printed circuit board provided with a metallic single-ring dual magnetic resonance structure, which are overlapped. The specific implement method comprises the steps as follows: the printed circuit board provided with a single-ring dual magnetic resonance structure array achieves two negative permeability frequency bands, and the ferrimagnetics under control of an external DC magnetic field achieves another negative permeability; and via changing intensity of the external DC magnetic field, three negative permeability frequency bands are synchronously and intelligently controlled. The three-frequency negative permeability metamaterial constructed by the invention can be applicable to fields of adjustable three-frequency negative refractive index metamaterials, adjustable three-frequency band-pass/band stop, adjustable three-frequency electromagnetic stealth materials, wave-absorbing materials and the like.
Description
Technical field
The present invention relates to a kind of tunable three frequency ultra material of negative magnetoconductivity and preparation methods, belong to the microwave electromagnetic field of materials based on ferrimagnet.
Background technology
2000; The structure negative permittivity material that people such as D.R.Smith propose based on J.B.Pendry, the thought of single negative magnetic-inductive capacity material; Artificial first synthesizing, realized the desirable material with negative refractive index that the scientist V.G.Veselago of the former Soviet Union in 1976 is foretold at X-band effective dielectric constant and the equivalent permeability negative refracting power microwave material for bearing simultaneously.Material with negative refractive index has become the primary study object of fields such as current physics, materialogy, electromagnetism, optics and cross discipline, is with a wide range of applications and important scientific meaning.Usually the method that realizes material with negative refractive index all is synthetic by single negative permittivity material and single negative magnetic-inductive capacity material.Array of metal lines by periodic arrangement is easy to realize the single negative permittivity of broadband, and realizes that single negative magnetic-inductive capacity material of wideband becomes the guardian technique problem of restriction material with negative refractive index.
Negative magnetic-inductive capacity material is the non-existent artificial composite structure material of a kind of occurring in nature, distributes through geometry and the space pattern of regulating its construction unit, can obtain the minus material of magnetic permeability.Negative magnetic-inductive capacity material is combined with each other with the negative permittivity material can make a kind of material-LHM of novelty.In this material, electromagnetic phase velocity and group velocity are in the opposite direction, thereby demonstrate the optical characteristics of many novelties, like unusual Doppler effect, unusual Cherenkov effect, perfect lens effect, negative refraction etc.Thereby there is important use be worth in fields such as radio communication, hypersensitization transducer, diagnosis imagings.
The method that realizes the wideband negative magnetic-inductive capacity material at present mainly contains technology such as double frequency, three frequencies, multifrequency; And based on materials such as ferroelectric, ferromagnetic, liquid crystal, through technology such as extra electric field, magnetic field, temperature controls to realize tunable method.Yet; To realize the wideband Based Intelligent Control further; To be applied to various application scenario; Urgent need is designed the material with negative refractive index with tunable performance of a kind of wideband or multifrequency, wherein the most key technology be realize wideband or multifrequency have a ultra material of the tunable single negative magnetoconductivity of intelligence.
CN 1670602A relates to a kind of stratiform microwave negative magnetic-inductive capacity material, the tunable stratiform microwave of particularly a kind of intensity in transmission negative magnetic-inductive capacity material.Compare with material in the past, the construction unit of negative magnetic-inductive capacity material of the present invention is a metal hexagonal apertures resonant ring; By the inner and outer ring physical dimension can adjusted and controlled unit resonance frequency resonant intensity; Through regulating physical dimension and the lattice constant of forming construction unit, the effect of intercoupling can make tunable stratiform microwave negative magnetic-inductive capacity material with different electromagnetism promptly to introduce the defective resonant ring.The microwave transmission test shows of prepared material, its resonance frequency is adjustable in 8200 ~ 8400MHz frequency range, and resonance intensity can be-31 ~-change in the 7dB scope.
The present invention is based on the intelligent tunable characteristic of ferrimagnet, but and the single ring architecture of simple realization double frequency negative magnetoconductivity, a kind of three ultra materials of the tunable single negative magnetoconductivities of intelligence and preparation method thereof are frequently proposed.
Summary of the invention
The object of the present invention is to provide a kind of tunable three frequency ultra material of negative magnetoconductivity and preparation methods, wide, the stable performance of operating frequency of the ultra material of said negative magnetoconductivity based on ferrimagnet; Said preparation method is simple.
The ultra material of tunable three frequency negative magnetoconductivities based on ferrimagnet of the present invention is by ferrimagnet and range upon range of the forming of printed circuit board that is printed with the two magnetic resonance structures of a kind of monocycle.Concrete implementation method is to realize two negative magnetoconductivity frequency ranges by the printed circuit board that is printed with the two magnetic resonance construction unit arrays of monocycle, under applying dc magnetic field control, realizes another negative magnetoconductivity frequency range by ferrimagnet; Through changing applying dc magnetic field intensity, three negative magnetoconductivity frequency ranges of while Based Intelligent Control.
For reaching this purpose, the present invention adopts following technical scheme:
A kind of tunable three ultra materials of negative magnetoconductivities frequently based on ferrimagnet, this material synthesize substrate by the two magnetic resonance ring structures of single steel intrauterine device, ceramic base hydrocarbon and ferrimagnet is range upon range of constitutes.
The two magnetic resonance ring structure etchings of described single steel intrauterine device are on the synthetic substrate of ceramic base hydrocarbon.
The two magnetic resonance ring structures of single steel intrauterine device of etching have two negative magnetoconductivity frequency ranges on the synthetic substrate of said ceramic base hydrocarbon; Said ferrimagnet has another negative magnetoconductivity frequency range under the applying dc magnetic field condition; The synthetic substrate of said ceramic base hydrocarbon reduces the intercoupling relation between metal resonant ring and the ferrimagnet, but the ultra material of said negative magnetoconductivity is in that to add under the changes of magnetic field three equal Based Intelligent Control of frequency ranges tuning.
The synthetic baseplate material of ceramic base hydrocarbon according to the invention selects for use the dielectric loss angle tangent value less than the synthetic substrate of 0.02 ceramic base hydrocarbon.Further, said substrate thickness is 0.254 ~ 0.762mm.
Metal wire thickness at the two magnetic resonance ring structures of said single steel intrauterine device is 0.018 ~ 0.035mm, and width is 0.1 ~ 0.3mm;
Further, the spacing between metal wire is 0.1 ~ 0.3mm, and gap width is 0.1 ~ 0.3mm;
Further, the two magnetic resonance ring structure cell sizes of said single steel intrauterine device are 3.4 ~ 5mm, and period is 4 ~ 6mm.
Said ferrimagnet selects for use loss tangent less than 0.005 microwave ferrogarnet, and preferably its thickness is 0.5 ~ 2mm.
The present invention also provides a kind of ultra preparation methods of tunable three frequency negative magnetoconductivities based on ferrimagnet, may further comprise the steps:
1) on the synthetic substrate of ceramic base hydrocarbon, etches the two magnetic resonance ring structure arrays of monocycle, process printed circuit board (PCB);
2) preparation microwave ferrogarnet class ferrimagnet substrate;
3) by the described printed circuit board of step 1), step 2) described ferrimagnet substrate layer stacks and puts and stick together, and obtains a kind of tunable three ultra materials of negative magnetoconductivities frequently based on ferrimagnet.
A kind of ultra preparation methods of tunable three frequency negative magnetoconductivities based on ferrimagnet specifically may further comprise the steps:
1) adopt the circuit board lithographic technique, on the synthetic substrate (2) of ceramic base hydrocarbon, etching cell size is 3.4 ~ 5mm, and period is the two magnetic resonance ring structure arrays of the monocycle of 4 ~ 6mm, processes printed circuit board (PCB);
2) preparation thickness is the microwave ferrogarnet class ferrimagnet substrate of 0.5 ~ 2mm;
3) by described printed circuit board, the step 2 that is etched with the resonant ring array of step 1)) described ferrimagnet substrate layer stacks and puts and stick together, and obtains a kind of tunable three ultra materials of negative magnetoconductivities frequently based on ferrimagnet.
Adopt the adjustable magnetic field generator of magnetic field intensity to produce the D.C. magnetic field of 1 ~ 2kOe, to act on the ultra material of tunable three frequency negative magnetoconductivities that the present invention is based on ferrimagnet, three negative magnetoconductivity working frequency range of Based Intelligent Control.
Compare with the prior art scheme, the present invention has following beneficial effect:
The present invention is through loading ferrimagnet to the two magnetic resonance rings of monocycle, but the simple realization three ultra material of negative magnetoconductivity electromagnetism frequently, and these three negative magnetoconductivity working frequency range can change with applying dc magnetic field and produce frequency displacement, have widened the working band of three frequency negative magnetoconductivities.The present invention constructed three frequently the ultra material of negative magnetoconductivities have intelligent characteristic, the ultra material of negative indexes, tunable three frequency bands lead to/fields such as band stop filter, tunable three frequency electromagnetism stealth materials and absorbing material frequently to be used for tunable three.
Description of drawings
Fig. 1: based on the ultra material cell sketch map of the humorous three frequency negative magnetoconductivities of the two magnetic resonance Adjustable structure of the monocycle of ferrimagnet, among the figure: 1 is the two magnetic resonance structures of single steel intrauterine device, and 2 is the synthetic substrate of ceramic base hydrocarbon, and 3 is ferrimagnet.
Fig. 2: the equivalent permeability of embodiment of the invention ferrimagnet under different externally-applied magnetic field sizes is with the curve chart of frequency change.
Fig. 3: (a) the S-parameter of the two magnetic resonance structures of embodiment of the invention single steel intrauterine device is with frequency variation curve figure; (b) the S-parameter of the ultra material of the embodiment of the invention is with frequency variation curve figure.
Fig. 4: (a) embodiment of the invention is based on the effective dielectric constant of the ultra material of three frequency negative magnetoconductivities of ferrimagnet; (b) equivalent permeability of the ultra material of the embodiment of the invention.
Fig. 5: the S-parameter of the ultra material of the embodiment of the invention under different applying dc magnetic field intensity is with frequency variation curve figure.
Fig. 6: the variation characteristic of the equivalent permeability of the ultra material of the embodiment of the invention under different applying dc magnetic field intensity.
Down in the face of further explain of the present invention.But following instance only is a simple and easy example of the present invention, does not represent or limits rights protection scope of the present invention, and interest field of the present invention is as the criterion with claims.
Embodiment
For the present invention is described better, be convenient to understand technical scheme of the present invention, typical case of the present invention but non-restrictive example is following:
At first, adopt the circuit board lithographic technique, on the synthetic substrate of the less ceramic base hydrocarbon of dielectric loss, etch the two magnetic resonance structures of single steel intrauterine device; Metal wire thickness is 0.018 ~ 0.035mm; Width is 0.1 ~ 0.3mm, and the spacing between metal wire is 0.1 ~ 0.3mm, and gap width is 0.1 ~ 0.3mm; Whole magnetic resonance cellular construction 3.4 ~ 5mm, period 4 ~ 6mm; Secondly, preparing thickness is the microwave ferrogarnet class ferrimagnet substrate of 0.5 ~ 2mm; At last; The printed circuit board that is etched with the resonant ring array and microwave ferrogarnet class ferrimagnet substrate layer stacked put and stick together; To construct the ultra material of three frequency negative magnetoconductivity electromagnetism; Adopt the adjustable magnetic field generator of magnetic field intensity to produce the D.C. magnetic field of 1 ~ 2kOe, three negative magnetoconductivity working frequency range of Based Intelligent Control.
Implementation process of the present invention and properties of materials are described by embodiment and accompanying drawing:
Select the commercial microwave ferrogarnet class G-4256 series ferrimagnet substrate of Trans-Tech Co., Ltd for use, its concrete parameter is: saturation magnetization 4 π Ms=1600Gs, ferromagnetic resonance linewidth Δ H=84Oe, DIELECTRIC CONSTANTS
r=15.1, and losstangenttan=0.0002.Ferrimagnet thickness is 0.5mm, and in this ferrimagnet, when incident electromagnetic wave during along the incident of y direction (as shown in Figure 1), the equivalent permeability theoretical expression of ferrimagnet does applying dc magnetic field along z directive effect as shown in Figure 1
μ
eff=(μ
2-κ
2)/μ,μ=1+ω
mω
0/(ω
0 2-ω
2),κ=ω
mω/(ω
0 2-ω
2) (1)
ω wherein
0=γ H
0Be ferromagnetic resonance frequency, γ is a gyromagnetic ratio, ω
m=4 π γ Ms are characteristic frequencies of ferrimagnet, H
0Be the applying dc magnetic field biasing.Use the parameter and the formula (1) of G-4256 series ferrimagnet, it is as shown in Figure 2 with the curve chart of frequency change to calculate its equivalent permeability.Fig. 2 for ferrimagnet at the curve chart of the applying dc magnetic field intensity equivalent permeability that is 1.2kOe in the 1.6kOe scope with frequency change; Figure can know thus; When applying dc magnetic field increases; The ferromagnetic resonance frequency of ferrimagnet increases thereupon, so the also increase thereupon of negative magnetoconductivity frequency range, has tunable characteristic.
The ultra material cell structure of three frequency negative magnetoconductivities as shown in Figure 1 is placed waveguide, and waveguide is set to electric wall along the z direction, is set to the magnetic wall along the x direction, is the direction of propagation of incident electromagnetic wave along the y direction.The size of the two magnetic resonance structures of single steel intrauterine device is set to: metal wire thickness 0.018mm, live width c=0.1mm, wire spacing b=0.1mm, slit e=0.3mm, cell size a=3.4mm, period d=4mm, synthetic substrate thickness t
1=0.5mm.Synthetic substrate adopts the TMM4 of ROGERS CORPORATION series sheet material, DIELECTRIC CONSTANTS
r=4.5, dielectric loss angle tangent tan δ=0.002.The negative magnetoconductivity transmission characteristic is as shown in Figure 3 frequently to adopt the Ansoft electromagnetic simulator HFSS13.0 of company emulation to draw of the present invention three.Fig. 3 (a) is depicted as the ferrimagnet material is replaced by a kind of dielectric constant is 15.1 illusion medium, to draw two resonance frequencys of the two magnetic resonance structures of independent single steel intrauterine device; Fig. 3 (b) is the transmission characteristic of whole three frequency negative magnetoconductivity structures when applying dc magnetic field is 1.4kOe.Can know that by Fig. 3 (a) the two magnetic resonance structures of monocycle have three resonance point 7.5GHz, 8.7GHz, 10.2GHz; Preceding two points are the magnetic resonance point, and a back point is the electric resonance point; Preceding two some strength of resonances obviously are better than the strength of resonance of a back point.Can be known that by Fig. 3 (b) when increasing the D.C. magnetic field of ferrimagnet and 1.4kOe, the ultra material of whole three frequency negative magnetoconductivities has increased a resonance point 5.7GHz, this resonance point of deducibility is the ferromagnetic resonance frequency point of ferrimagnet thus.
Fig. 4 for extract by inversion algorithm three frequently effective dielectric constant and the equivalent permeability of the ultra material of negative magnetoconductivities with the curve chart of frequency change.Can know that by Fig. 4 its equivalent permeability has demonstrated three typical magnetic resonance frequencies, lays respectively at 5.7GHz, 7.5GHz and 8.5GHz.Therefore three negative magnetoconductivity frequency ranges lay respectively at 5.7-5.9GHz, 7.5-7.7GHz and 8.5-9.0GHz.Be positioned at the 10.2GHz place among Fig. 4 and an electric resonance frequency occurred, but fail to realize the negative permittivity frequency range.
Fig. 5 is the transmission characteristic of this three frequency ultra material of negative magnetoconductivity electromagnetism under different applying dc magnetic field intensity.Can know that by figure when applying dc magnetic field intensity was increased to 1.6kOe by 1.2kOe, first transmission forbidden band was increased to 6.3GHz by 5.2GHz apace, and two transmission bands in back increase less.When further increase externally-applied magnetic field intensity, frequency displacement greatly will be done in latter two transmission forbidden band.The variation characteristic of equivalent permeability under different applying dc magnetic field intensity that Fig. 6 extracts for inversion algorithm.Can know that by figure when externally-applied magnetic field increased, translation had all taken place three negative magnetoconductivity frequency ranges.
The foregoing description shows; Through the two magnetic resonance rings of monocycle are loaded ferrimagnet; But simple realization three is the ultra material of negative magnetoconductivity electromagnetism frequently, and these three negative magnetoconductivity working frequency range can change with applying dc magnetic field and produce frequency displacement, has widened the working band of three frequency negative magnetoconductivities.
Applicant's statement; The present invention explains detailed structure characteristic of the present invention and preparation method through the foregoing description; But the present invention is not limited to above-mentioned detailed structure characteristic and preparation method, does not mean that promptly the present invention must rely on above-mentioned detailed structure characteristic and the preparation method could implement.The person of ordinary skill in the field should understand, and to any improvement of the present invention, to the increase of the equivalence replacement of parts that the present invention selects for use and accessory, the selection of concrete mode etc., all drops within protection scope of the present invention and the open scope.
Claims (9)
1. the ultra material of tunable three frequency negative magnetoconductivities based on ferrimagnet is characterized in that this material is by the two magnetic resonance ring structures (1) of single steel intrauterine device, the synthetic substrate (2) of ceramic base hydrocarbon and the range upon range of formation of ferrimagnet (3).
2. ultra material as claimed in claim 1 is characterized in that, two magnetic resonance ring structure (1) etchings of described single steel intrauterine device are on the synthetic substrate (2) of ceramic base hydrocarbon.
3. according to claim 1 or claim 2 ultra material; It is characterized in that; The two magnetic resonance ring structures (1) of single steel intrauterine device of going up etching at the synthetic substrate (2) of said ceramic base hydrocarbon have two negative magnetoconductivity frequency ranges; Said ferrimagnet (3) has another negative magnetoconductivity frequency range under the applying dc magnetic field condition; The synthetic substrate (2) of said ceramic base hydrocarbon reduces the intercoupling relation between metal resonant ring and the ferrimagnet, but the ultra material of said negative magnetoconductivity is in that to add under the changes of magnetic field three equal Based Intelligent Control of frequency ranges tuning.
4. like the described ultra material of one of claim 1-3, it is characterized in that the ceramic base hydrocarbon synthesizes substrate (2) material selection dielectric loss angle tangent value less than the synthetic substrate of 0.02 ceramic base hydrocarbon;
Preferably, said substrate thickness is 0.254 ~ 0.762mm.
5. ultra material as claimed in claim 4 is characterized in that, is 0.018 ~ 0.035mm at the metal wire thickness of the two magnetic resonance ring structures (1) of said single steel intrauterine device, and width is 0.1 ~ 0.3mm;
Preferably, the spacing between metal wire is 0.1 ~ 0.3mm, and gap width is 0.1 ~ 0.3mm;
Preferably, two magnetic resonance ring structure (1) cell sizes of said single steel intrauterine device are 3.4 ~ 5mm, and period is 4 ~ 6mm.
6. like the described ultra material of one of claim 1-5, it is characterized in that said ferrimagnet (3) selects for use loss tangent less than 0.005 microwave ferrogarnet; Preferred its thickness is 0.5 ~ 2mm.
7. one kind like the described tunable three ultra preparation methods of negative magnetoconductivities frequently based on ferrimagnet of one of claim 1-6, may further comprise the steps:
1) on the synthetic substrate (2) of ceramic base hydrocarbon, etches the two magnetic resonance ring structure arrays of monocycle, process printed circuit board (PCB);
2) preparation microwave ferrogarnet class ferrimagnet substrate;
3) by the described printed circuit board of step 1), step 2) described ferrimagnet substrate layer stacks and puts and stick together, and obtains a kind of tunable three ultra materials of negative magnetoconductivities frequently based on ferrimagnet.
8. method as claimed in claim 7 is characterized in that, may further comprise the steps:
1) adopt the circuit board lithographic technique, on the synthetic substrate (2) of ceramic base hydrocarbon, etching cell size is 3.4 ~ 5mm, and period is the two magnetic resonance ring structure arrays of the monocycle of 4 ~ 6mm, processes printed circuit board (PCB);
2) preparation thickness is the microwave ferrogarnet class ferrimagnet substrate of 0.5 ~ 2mm;
3) by described printed circuit board, the step 2 that is etched with the resonant ring array of step 1)) described ferrimagnet substrate layer stacks and puts and stick together, and obtains a kind of tunable three ultra materials of negative magnetoconductivities frequently based on ferrimagnet.
9. described tunable three purposes of the ultra material of negative magnetoconductivities frequently of one of claim 1-6 based on ferrimagnet; It is characterized in that, said ultra material can be used for tunable three frequently the ultra material of negative indexes, tunable three frequency bands logical/fields such as band stop filter, tunable three frequency electromagnetism stealth materials and absorbing material.
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| CN105789905A (en) * | 2016-02-26 | 2016-07-20 | 哈尔滨工业大学深圳研究生院 | Metal thin film antistructure based gyromagnetic substrate super surface |
| CN106556627A (en) * | 2015-01-22 | 2017-04-05 | 江西师范大学 | Sensor based on nano material |
| JP2017108378A (en) * | 2015-09-25 | 2017-06-15 | ザ・ボーイング・カンパニーＴｈｅ Ｂｏｅｉｎｇ Ｃｏｍｐａｎｙ | Ferrite-enhanced metamaterials |
| CN107039773A (en) * | 2017-04-19 | 2017-08-11 | 成都亿派智能科技有限公司 | A kind of adjustable negative exponent metamaterial structure in microwave frequency band broadband |
| CN107221753A (en) * | 2017-05-22 | 2017-09-29 | 西安电子科技大学 | Multiband LHM structure |
| CN108521022A (en) * | 2018-03-29 | 2018-09-11 | 中国地质大学（北京） | A kind of total transmissivity artificial electromagnetic material |
| CN109428174A (en) * | 2017-08-31 | 2019-03-05 | 深圳光启尖端技术有限责任公司 | A kind of Meta Materials |
| WO2019237765A1 (en) * | 2018-06-15 | 2019-12-19 | 京东方科技集团股份有限公司 | Metamaterial structural unit, metamaterial and electronic device |
| CN110854536A (en) * | 2019-10-28 | 2020-02-28 | 宁波大学 | Tunable double-frequency negative permeability metamaterial with loaded capacitor |
| CN111564704A (en) * | 2020-04-29 | 2020-08-21 | 中国电子产品可靠性与环境试验研究所（（工业和信息化部电子第五研究所）（中国赛宝实验室）） | Tunable wave-absorbing metamaterial based on ferromagnetic resonance |
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| CN114069246A (en) * | 2021-12-02 | 2022-02-18 | 四川大学 | Rectification surface for absorbing electromagnetic waves based on periodic structure |
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| CN106556627B (en) * | 2015-01-22 | 2019-04-26 | 江西师范大学 | Sensor based on nano material |
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| CN107039773A (en) * | 2017-04-19 | 2017-08-11 | 成都亿派智能科技有限公司 | A kind of adjustable negative exponent metamaterial structure in microwave frequency band broadband |
| CN107221753A (en) * | 2017-05-22 | 2017-09-29 | 西安电子科技大学 | Multiband LHM structure |
| CN107221753B (en) * | 2017-05-22 | 2020-01-31 | 西安电子科技大学 | Multi-band left-handed material structure |
| CN109428174A (en) * | 2017-08-31 | 2019-03-05 | 深圳光启尖端技术有限责任公司 | A kind of Meta Materials |
| CN111937232A (en) * | 2018-02-22 | 2020-11-13 | 马萨诸塞大学 | Antenna hardware and control |
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| WO2019237765A1 (en) * | 2018-06-15 | 2019-12-19 | 京东方科技集团股份有限公司 | Metamaterial structural unit, metamaterial and electronic device |
| CN110609422A (en) * | 2018-06-15 | 2019-12-24 | 京东方科技集团股份有限公司 | Metamaterial structure unit, metamaterial and electronic device |
| CN110854536A (en) * | 2019-10-28 | 2020-02-28 | 宁波大学 | Tunable double-frequency negative permeability metamaterial with loaded capacitor |
| CN110854536B (en) * | 2019-10-28 | 2021-11-12 | 宁波大学 | Tunable double-frequency negative permeability metamaterial with loaded capacitor |
| CN113381193A (en) * | 2020-03-10 | 2021-09-10 | 哈尔滨工业大学 | Liquid crystal reconfigurable frequency selective surface |
| CN113381193B (en) * | 2020-03-10 | 2022-06-14 | 哈尔滨工业大学 | Liquid crystal reconfigurable frequency selective surface |
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| CN114069246A (en) * | 2021-12-02 | 2022-02-18 | 四川大学 | Rectification surface for absorbing electromagnetic waves based on periodic structure |
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