CN102480014B - Shape memory metamaterial and preparation method thereof - Google Patents
Shape memory metamaterial and preparation method thereof Download PDFInfo
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- CN102480014B CN102480014B CN201110120974.XA CN201110120974A CN102480014B CN 102480014 B CN102480014 B CN 102480014B CN 201110120974 A CN201110120974 A CN 201110120974A CN 102480014 B CN102480014 B CN 102480014B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C61/00—Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor
- B29C61/06—Making preforms having internal stresses, e.g. plastic memory
- B29C61/0608—Making preforms having internal stresses, e.g. plastic memory characterised by the configuration or structure of the preforms
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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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- Laminated Bodies (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
The present invention relates to a kind of preparation method of shape memory metamaterial, comprise the steps: S1, make the base material with original shape with shape-memory material; S2, adhere to man-made microstructure on the substrate, obtain metamaterial layer; S3, be that described metamaterial layer gives distortion, obtain shape memory metamaterial, described strained shape memory metamaterial, when reaching its recovery of shape condition, will revert back to original shape.The invention still further relates to a kind of shape memory metamaterial adopting the inventive method obtained.Owing to adopting shape-memory material as base material, shape memory metamaterial of the present invention is had concurrently simultaneously function that shape memory and special electromagnetic respond two aspects, for Meta Materials has widened new application.
Description
Technical field
The present invention relates to Meta Materials field, more particularly, relate to a kind of shape memory metamaterial and preparation method thereof.
Background technology
Meta Materials is a kind of new material, be the base material be made up of nonmetallic materials and attachment on substrate surface or the multiple man-made microstructure being embedded in base material inside form.Base material can be divided into multiple square substrates unit of rectangular array arrangement virtually, each base material unit be attached with a man-made microstructure thus form a metamaterial unit, namely whole Meta Materials is made up of, just as crystal is made up of according to certain arrangement countless lattices hundreds thousand of, 1,000,000 even more than one hundred million such metamaterial unit.Man-made microstructure in each metamaterial unit is identical or incomplete same.Man-made microstructure is the certain geometric cylindrical or flat wire of composition, and the shape of composition is annular, " work " shape etc.
Due to the existence of man-made microstructure, each metamaterial unit has the effective dielectric constant and equivalent permeability that are different from base material itself, and the Meta Materials that therefore all metamaterial unit are formed presents specific response characteristic to Electric and magnetic fields; Meanwhile, different concrete structures and shape are designed to man-made microstructure, effective dielectric constant and the equivalent permeability of its unit can be changed, and then change the response characteristic of whole Meta Materials.
In prior art, the base material of Meta Materials selects polytetrafluoroethylene or ceramic material usually, and its dielectric constant and magnetic permeability are all close to air, therefore less on the impact of electromagnetic field, there is good intensity simultaneously, applicable at the various communication field such as antenna, radar.But, polytetrafluoroethylene and pottery crisp frangible, for manufacturing the Meta Materials produced, its shape is fixing, in the occasion that some needs shape to finely tune or be out of shape, such as, under room temperature for spirality, need to be adjusted to plate shaped higher than room temperature more than 20 degree when, the Meta Materials of existing base material material can not meet such demand.
Summary of the invention
The technical problem to be solved in the present invention is, for the above-mentioned defect of prior art, provide a kind of under given conditions can the preparation method of shape memory metamaterial of deformation.
The technical solution adopted for the present invention to solve the technical problems is: the preparation method providing a kind of shape memory metamaterial.
The preparation method of a kind of shape memory metamaterial of the present invention, comprises the steps:
S1, make the base material with original shape with shape-memory material;
S2, adhere to man-made microstructure on the substrate, obtain metamaterial layer;
S3, be that described metamaterial layer gives distortion, obtain shape memory metamaterial, described strained shape memory metamaterial, when reaching its recovery of shape condition, will revert back to original shape.
In the preparation method of shape memory metamaterial of the present invention, the original shape of described base material is plate shaped.
In the preparation method of shape memory metamaterial of the present invention, described step S3 has carried out twice, and figuration is semi-cylindrical shaped or cylindrical shape for the first time, and semi-cylindrical shaped or cylindrical shape memory Meta Materials figuration are spirality by second time.
In the preparation method of shape memory metamaterial of the present invention, described shape-memory material is thermic induction type shape-memory material, has Stationary liquid and can anti-phase.
In the preparation method of shape memory metamaterial of the present invention, described thermic induction type shape-memory material is Styrene-Butadiene, its Stationary liquid transition temperature T
fbe 120 DEG C, reversible phase transition temperature T
rit is 60 DEG C.
In the preparation method of shape memory metamaterial of the present invention, described step S1 adopts injection molding process.
In the preparation method of shape memory metamaterial of the present invention, described step S2 adopts photochemical etching process man-made microstructure to be printed on described base material.
In the preparation method of shape memory metamaterial of the present invention, described man-made microstructure is melt by metallic particles the metal wire that the one-tenth of arranging has geometrical pattern.
In the preparation method of shape memory metamaterial of the present invention, described step S3 comprises the steps: metamaterial layer imparting distortion
S31, temperature is warming up to higher than its reversible phase transition temperature lower than its Stationary liquid transition temperature to described metamaterial layer;
S32, by artificial or machinery, described metamaterial layer to be out of shape;
S33, described metamaterial layer to be cooled rapidly, described metamaterial layer is solidified and keeps the shape after being out of shape.
The present invention also provides a kind of shape memory metamaterial, comprises the base material be made up of shape-memory material and attachment man-made microstructure on the substrate, the shape of described base material relative to manufactured out time original shape be endowed distortion.
Implement shape memory metamaterial of the present invention and preparation method thereof, there is following beneficial effect: owing to adopting shape-memory material as base material, shape memory metamaterial of the present invention is had concurrently simultaneously function that shape memory and special electromagnetic respond two aspects, for Meta Materials has widened new application.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the FB(flow block) of the preparation method of shape memory metamaterial of the present invention;
Fig. 2 is the detailed step figure of step S3 in flow process shown in Fig. 1;
The end view that Fig. 3 is metamaterial layer that step S2 obtains when being plate shaped;
Fig. 4 is the front view of metamaterial layer shown in Fig. 3;
Fig. 5 is the end view of metamaterial layer shown in Fig. 4 when being deformed into semi-cylindrical shaped;
Fig. 6 is the end view of the metamaterial layer shown in Fig. 4 when being deformed into cylindrical shape;
Fig. 7 is the end view when metamaterial layer shown in Fig. 3 or Fig. 4 being deformed into further spirality.
Embodiment
The shape memory function of distinctive for Meta Materials electromagnetic response function and shape-memory material combines by the present invention, designs a kind of shape memory metamaterial, and provides its preparation method.
As shown in Fig. 5 to 7, the man-made microstructure 2 that shape memory metamaterial 4 of the present invention comprises base material 1 and is attached on base material 1.The material such as polytetrafluoroethylene, pottery selected usually by traditional base material 1, the present invention with it unlike, adopt shape-memory material as the material of base material 1.
Shape-memory material, as its name suggests, namely there is the material of shape memory function, can be divided into several classes such as thermic induction type, electroluminescent induction type, photic induction type, chemical co-ordination type, mangneto induction type according to Shape memory mechanism difference, rear different materials all designs based on the general principle of thermotropic shape-memory material.Shape-memory material that is nonmetal or alloy no matter belongs to which kind, as long as all can be used in Meta Materials of the present invention as base material 1.
Thermic induction type shape-memory material, refer to that this material is out of shape by External Force Acting under a specified temp, be out of shape rear cooling down thus shape is fixed, and this material is by the shape before automatically reverting to distortion when temperature is elevated to above-mentioned specified temp, such material just belongs to thermic induction type shape-memory material.Usually, specified temp here, and absolute difference between room temperature is comparatively large, at least more than 10 degrees Celsius, to meet the application of shape-memory material under specific occasion.
Conventional thermic induction type shape-memory material has:
1) the TPO shape-memory material such as PETG, polynorbornene, using trans-polyisoprene, Styrene-Butadiene, polyethylene, ethylene-vinyl acetate copolymer, polytetrafluoroethylene and polyvinyl chloride;
2) 4,4 '-'-diphenylmethane diisocyanate/polycaprolactone/1,4 butanediols, 4,4 '-'-diphenylmethane diisocyanate/PolyTHF/1,4 butanediols, 4, the polyurethanes block shape-memory materials such as 4 '-'-diphenylmethane diisocyanate/poly adipate succinic acid ester dihydroxylic alcohols/trimethylolpropane;
3) the polyesters shape-memory material such as PETG H, polycaprolactone and PLA.
The base material 1 that shape-memory material is made can for shape required arbitrarily under its operating state, be such as spirality, as shown in Figure 6, and before being endowed distortion, under internal stress free or the very little free state of internal stress, produced original shape is plate shaped, as shown in Figure 3.When temperature reach recovery of shape temperature namely specified temp above time, spiral base material 1 will expand into plate shaped again, thus realize certain function.
Such as solar panel, be transported to need when absorbing solar energy in space to expand into and plate shapedly absorb sunlight as much as possible to increase surface area, then need to be wound into spirality to reduce transportation volume in the process being transported to space, namely such solar panel can realize with shape memory metamaterial 4 of the present invention, Automatic-expanding when realizing reaching uniform temperature by the base material 1 of shape-memory material on the one hand, on the other hand, the electromagnetic response that man-made microstructure on base material 12 and base material 1 send the sun jointly and absorb heat energy.
Man-made microstructure 2 is attached on substrate before base material 1 is out of shape.Man-made microstructure 2 is generally the wire forming certain geometrical pattern, such as " work " font, snowflake shape, " ten " font, split ring resonator even other arbitrary shapes.Existence wiry, make to produce electric field and/or magnetic responsiveness to electromagnetic wave when electromagnetic wave passes, thus make whole Meta Materials embody distinctive electromagnetic response characteristic, realize the specific function that nature material does not have, such as, inhale ripple, convergence or divergent electromagnetic ripple etc.
Man-made microstructure 2 is attached on base material 1 by modes such as etching, ion quarter, plating, printings, and the man-made microstructure 2 on every plate substrate 1 and surface thereof forms a metamaterial layer 3, and each shape memory metamaterial 4 comprises one or more such metamaterial layer 3.
The preparation method of shape memory metamaterial 4 of the present invention, as shown in Figure 1, comprises following step:
S1, make the base material 1 with original shape with shape-memory material;
In this step, available shape-memory material has a detailed description in the preceding article, and above-mentioned nonmetal, unalloyed thermic induction type shape-memory material all can be used in the present invention as base material 1.In practical operation, conventional shape-memory material selects the one among the prepolymer of Styrene-Butadiene, methyl diphenylene diisocyanate and butanediol, polynorbornene, optimization styrene-butadiene copolymer.
Thermic induction type shape-memory material generally includes Stationary liquid and can anti-phase.The part of shape memory can be realized as dynamic equilibrium by anti-phase, be generally the transformation of unbodied rubbery state and glassy state, the melting of crystallization and recrystallization.Stationary liquid can be in its fusing point T
mor glass transition temperature T
gfollowing molecule is wound around interpenetrating networks, as PCL (PLC) and the polynorbornene of HMW, this base polymer forms the Stationary liquid with physical crosslinking point, it can also be the amorphous regions with cross-linked structure, as the shape memory high molecule crosslinked polyethylene found the earliest, form the Stationary liquid of chemical crosslinking.
Such as above-mentioned preferred Styrene-Butadiene, its Stationary liquid is polystyrene crystalline portion, can anti-phase be butadiene fraction, and Stationary liquid is molten into liquid transition temperature T by solid-state
fbe about 120 DEG C, can the transition temperature T of anti-phase
rit is about 60 DEG C.Shape-memory material be made base material 1, in order to make base material 1 internal stress little, usually adopt injection mo(u)lding or moulding by casting, by the die cavity of the shape-memory material injection molding machine of liquid state, now the temperature of liquid material should apparently higher than T
f, usually between 125 ~ 135 DEG C, guarantee that material can flow freely internal stress little, to inject after die cavity by naturally to cool or water-cooled makes it to solidify, obtain the base material 1 with original shape.The words that base material 1 is thin first can make slab by cast or injection mo(u)lding, and then calendering formation obtains thin plate.
Original shape can be plate shaped, or other arbitrary shapes, is decided according to the actual requirements, as long as design difform die cavity.
Step S1 completes, obtained there is the base material 1 of original shape after, carry out step:
S2, on described base material 1, adhere to man-made microstructure 2, obtain metamaterial layer 3, as shown in Figure 3, Figure 4;
Step S2 can adopt etching or plating to realize.Here etch process; typically refer to photochemical etching (photochemical etching); be similar to the making of PCB; namely, first in substrate surface deposition layer of metal layers of foil, after exposure plate-making, development, will remove the diaphragm of etching area; the Metal Contact chemical solution in this region when etching; by dissolved corrosion, the remaining metal wire for having certain geometrical shape pattern, is man-made microstructure 2.
If employing etch process, the chemical solvent for etching and base material 1 should be avoided to react, in order to avoid destroy the surface flatness of base material 1, the overall structure even destroying base material 1 and shape.
Step S2 also can adopt typography to be printed on base material 1.Be similar to traditional printer, the metal powder granulates of certain particle size scope is positioned in a printer device, needing the region that man-made microstructure 2 is set, on this region metallic particles being shifted onto base material 1 and heating and melting, be that metallic particles is melted into and is integrally formed a strip metal silk thread, form the effect of " printing " man-made microstructure 2.
If employing typography, it should be noted, temperature metallic particles heating being made it to melt lower than the fusing point of the Stationary liquid conversion temperature of shape-memory material and Stationary liquid, should melt distortion to avoid material; Or metallic particles heating and the speed of solidifying be exceedingly fast, and complete the action of " printing " man-made microstructure 2 before heat does not conduct to base material 1.
Adopt the concrete technology of typography making artificial micro-structural 2, all right referenced patent " Fabricationof electronic components in plastic " (application number EP20060752653, inventor DavidVictor Thiel and Neeli Madhusudanrao), it adopts embossing machine (embossing machine) on plastic basis material 1, print the conduction man-made microstructure 2 with certain geometrical pattern.This patent of invention illustrates that step S2 of the present invention is feasible.
Each man-made microstructure 2 obtained successively, then substrate and on man-made microstructure 2 jointly form a metamaterial layer 3.
To following steps be carried out after obtained metamaterial layer 3:
S3, be that described metamaterial layer 3 gives distortion, obtain shape memory metamaterial 4.
Give distortion, be called for short figuration, order about metamaterial layer 3 by external force exactly and be deformed into another shape being different from original shape, such as spirality.The distinctive shape memory effect of thermic induction type shape-memory material derives from its special construction, its Stationary liquid transition temperature T
f(the T of Stationary liquid
gor T
m) higher than reversible phase transition temperature T
r(can the T of anti-phase
gor T
m), and requirement can the T of anti-phase
gor T
mon room temperature, anti-phase and Stationary liquid can all be in glassy state or crystalline state under room temperature condition, sub-chain motion is restricted.
When temperature is higher than T
rand lower than T
ftime, can the strand of anti-phase have enough energy to make conformation change, sub-chain motion aggravates, and macro manifestations is the transformation to elastomeric state of the melting of crystalline phase or glassy state.Now, material can produce deformation under external force or other factor effects, and Stationary liquid is now still in crystalline state or glassy state, molecule is fixed by its mutual physical action, strand is stoped to produce slippage, opposing deformation, can effect between anti-phase and Stationary liquid, inhibits the plasticity of chain move and produce back shape memory effect.The material of figuration carries out cooling process, and can the deformation of anti-phase be fixed, sub-chain motion is limited, then can come back to glassy state or crystalline state by anti-phase, and material exists with this dimensionally stable.
When the shape-memory material after outer bound pair figuration gives incentive condition, this material will produce the process of recovery of shape.That is, after again heating up, hai roll is bent due to entropic elasticity effect for strand, and the resilience force of Stationary liquid is discharged, deformation recovery, namely returns to the original shape in step S1.
Metamaterial layer 3 of the present invention, belongs to the scope of Meta Materials, owing to base material 1 being attached with the man-made microstructure 2 of metal, can producing response, make material internal heat-dissipating, recovery of shape will occur until original shape after reaching uniform temperature electromagnetic wave.The material that in shape-memory material, preferred thermal conductivity is low, make heat be not easy diffusion, heat generation temperature is high, and recovery of shape is very fast.
Therefore, carrying out step S3, is to make Meta Materials be applied in actual environment, reaching its recovery of shape condition, will revert to original shape once environmental condition.For thermic induction type shape-memory material, its recovery of shape condition is recovery of shape temperature.
Recovery of shape temperature, be also be temperature during metamaterial layer 3 figuration, its value is not less than reversible phase transition temperature T
rand not higher than Stationary liquid transition temperature T
f, now reversible is in glassy state mutually.Therefore, as shown in Figure 2, step S3 can point following steps carry out:
S31, recovery of shape temperature is warming up to the metamaterial layer 3 that step S2 obtains;
S32, by artificial or machinery, described metamaterial layer 3 to be out of shape;
S33, described metamaterial layer 3 to be cooled rapidly, described metamaterial layer 3 is solidified and keeps the shape after being out of shape.
As shown in Figure 5, Figure 6, plate shaped metamaterial layer 3 can be deformed into semi-cylindrical shaped or cylindrical shape by the mode of punching press in step S32.
If when metamaterial layer 3 is once out of shape the spirality of the shape such as solar panel that can not reach required, can realize by being repeatedly out of shape.Such as, first carrying out step S31, S32, a S33 is cylindrical shape or semi-cylindrical shaped by metamaterial layer 3 Pressing Deformation, and then carry out step S31, S32, S33 are by cylindrical shape or semi-cylindrical shaped Meta Materials 4 is manual is deformed into spirality, as shown in Figure 7.
It should be noted that, shape-memory material of the present invention is not limited in thermic induction type material mentioned above, also can utilize other shape-memory materials such as mangneto induction type, photic induction type shape-memory material, they are with after obtaining metamaterial layer 3 with the identical method of step S1, S2, when carrying out step S3, by the environmental condition of figuration or recovery of shape condition is no longer temperature but magnetic field, illumination.Such as when shape-memory material is photic induction type material, step S3 should point following steps carry out:
S31, illumination is carried out to the metamaterial layer 3 that step S2 obtains;
S32, by artificial or machinery, described metamaterial layer 3 to be out of shape;
S33, illumination is stopped to described metamaterial layer 3, described metamaterial layer 3 is solidified and keeps the shape after being out of shape.
The Meta Materials obtained so also belongs to shape memory metamaterial 4 of the present invention.
Adopt shape memory metamaterial 4 of the present invention, utilize the design of its man-made microstructure 2, can realize electromagnetic specific response, such as, can be used as the microwave regime such as lens, beam compression device (beam compressor), Beam switch (beam shifter), antenna, absorbing material; And shape-memory material, as base material 1, will further expand range of application and the applied environment of Meta Materials in the present invention, such as previously described solar panel.Another example and for example, Meta Materials can as the switch of anti-electromagnetic radiation, the base material 1 of Meta Materials is mangneto induction type shape-memory material, do not have electromagenetic wave radiation or radiation intensity low in base material 1 contact-making switch contact into a bent shape and not, switch is disconnected; And when receiving stronger electromagnetic wave, magnetic field excitation makes shape-memory material heat-dissipating and is out of shape, be out of shape rear and switch contact pad, switch conduction, then people can judge there is stronger electromagenetic wave radiation.
Other application examples of the present invention also have a lot, will not enumerate herein.Every method meeting step of the present invention and the shape memory metamaterial adopting method of the present invention obtained, all belong within scope.
Claims (9)
1. a preparation method for shape memory metamaterial, is characterized in that, comprises the steps:
S1, make the base material with original shape with shape-memory material, described shape-memory material is thermic induction type shape-memory material;
S2, adhere to man-made microstructure on the substrate, described man-made microstructure is the metal wire that the one-tenth melting arrangement by metallic particles has geometrical pattern, and obtain metamaterial layer, described Meta Materials is made up of base material and the man-made microstructure be positioned on base material;
S3, be that described metamaterial layer gives distortion, obtain shape memory metamaterial, described strained shape memory metamaterial, when man-made microstructure produces response to electromagnetic wave, makes the inner heat-dissipating of Meta Materials, when reaching its recovery of shape temperature conditions, original shape will be reverted back to.
2. the preparation method of shape memory metamaterial according to claim 1, is characterized in that, the original shape of described base material is plate shaped.
3. the preparation method of shape memory metamaterial according to claim 2, is characterized in that, described step S3 has carried out twice, and figuration is semi-cylindrical shaped or cylindrical shape for the first time, and semi-cylindrical shaped or cylindrical shape memory Meta Materials figuration are spirality by second time.
4. the preparation method of shape memory metamaterial according to claim 1, is characterized in that, described shape-memory material has Stationary liquid and can anti-phase.
5. the preparation method of shape memory metamaterial according to claim 4, is characterized in that, described thermic induction type shape-memory material is Styrene-Butadiene, its Stationary liquid transition temperature T
fbe 120 DEG C, reversible phase transition temperature T
rit is 60 DEG C.
6. the preparation method of shape memory metamaterial according to claim 4, is characterized in that, described step S1 adopts injection molding process.
7. the preparation method of shape memory metamaterial according to claim 4, is characterized in that, described step S2 adopts photochemistry etching technics man-made microstructure to be printed on described base material.
8. the preparation method of shape memory metamaterial according to claim 4, is characterized in that, described step S3 comprises the steps: metamaterial layer imparting distortion
S31, temperature is warming up to higher than its reversible phase transition temperature lower than its Stationary liquid transition temperature to described metamaterial layer, the reversible glassy state that is in mutually now in shape-memory material;
S32, by artificial or machinery, described metamaterial layer to be out of shape;
S33, described metamaterial layer to be cooled rapidly, described metamaterial layer is solidified and keeps the shape after being out of shape.
9. a shape memory metamaterial, it is characterized in that, comprise the base material and attachment man-made microstructure on the substrate be made up of shape-memory material, described man-made microstructure is melt by metallic particles the metal wire that the one-tenth of arranging has geometrical pattern, described shape-memory material is thermic induction type shape-memory material, the shape of described base material relative to manufactured out time original shape be endowed distortion, when described strained shape memory metamaterial produces response in man-made microstructure to electromagnetic wave time, make the inner heat-dissipating of Meta Materials, when reaching its recovery of shape temperature conditions, original shape will be reverted back to.
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| CN105150712A (en) * | 2015-09-25 | 2015-12-16 | 清华大学 | Transfer print method with shape memory effect |
| CN105461946B (en) * | 2015-12-14 | 2017-11-17 | 哈尔滨工业大学 | Deformation controllable composite material of shape memory and its deformation method |
| CN109449596A (en) * | 2018-11-13 | 2019-03-08 | 清华大学 | Directional diagram reconstructable flexible antennas based on shape-memory polymer |
| CN109441006B (en) * | 2018-11-30 | 2023-09-01 | 浙江大学 | Band gap controllable metamaterial beam based on shape memory alloy |
| CN112277346B (en) * | 2020-10-23 | 2022-08-12 | 航天特种材料及工艺技术研究所 | Frequency-adjustable intelligent wave-absorbing metamaterial and preparation method thereof |
| CN112701490B (en) * | 2020-12-17 | 2022-02-08 | 哈尔滨理工大学 | Dynamically-adjustable multifunctional terahertz metamaterial device based on TiNi shape memory alloy film |
| CN113193375B (en) * | 2021-04-21 | 2022-02-18 | 西安海天天线科技股份有限公司 | Method for manufacturing sheet-shaped dielectric elliptic cylindrical lens |
| CN113817310B (en) * | 2021-07-26 | 2023-03-24 | 广州大学 | Shape memory composite material and preparation method and application thereof |
| CN114498057B (en) * | 2022-02-25 | 2024-07-30 | 潍坊歌尔电子有限公司 | Antenna structure and electronic equipment |
| CN114872338B (en) * | 2022-05-05 | 2023-02-07 | 哈尔滨工业大学 | Preparation of bidirectional shape memory tuning metamaterial and tuning method of resonant frequency of bidirectional shape memory tuning metamaterial |
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| US7951319B2 (en) * | 2006-07-28 | 2011-05-31 | 3M Innovative Properties Company | Methods for changing the shape of a surface of a shape memory polymer article |
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| CN101106216A (en) * | 2007-04-13 | 2008-01-16 | 哈尔滨工业大学 | Extensible solid surface antenna reflective face of shape memory material |
| CN101699659A (en) * | 2009-11-04 | 2010-04-28 | 东南大学 | Lens antenna |
| CN101872904A (en) * | 2010-06-30 | 2010-10-27 | 哈尔滨工业大学 | Deformable antenna reflection surface |
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