CN103762429A - Soft and light electromagnetic wave absorbing material based on ferromagnetic/medium nano-multilayer film structure - Google Patents
Soft and light electromagnetic wave absorbing material based on ferromagnetic/medium nano-multilayer film structure Download PDFInfo
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- CN103762429A CN103762429A CN201410001244.1A CN201410001244A CN103762429A CN 103762429 A CN103762429 A CN 103762429A CN 201410001244 A CN201410001244 A CN 201410001244A CN 103762429 A CN103762429 A CN 103762429A
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Abstract
The invention relates to a soft and light electromagnetic wave absorbing material with a ferromagnetic/medium nano-multilayer film structure covers a polyimide substrate. Compared with a common artificial absorbing material, the soft and light electromagnetic wave absorbing material has the advantages of being small in film thickness, controllable in structure parameter, extremely light, large in surface area, soft in texture and the like. It is both certified through simulation and experiments that the soft and light electromagnetic wave absorbing material can achieve broadband wave absorbing in microwave bands, and -10dB absorbing bandwidth can maximally reach more than 10GHz. The soft and light electromagnetic wave absorbing material is simple in structure and can be achieved by adopting an electron beam evaporation technology assisted with ions. The soft and light electromagnetic wave absorbing material further has the advantages that regulation and control over wave absorbing central frequency are achieved through structural parameter regulation.
Description
Technical field:
The present invention relates to a kind of microwave band absorbing material, belong to novel artificial electromagnetic material field, be particularly related to a kind of in substrate alternately evaporation have cell structure ferromagnetic/flexible material of medium nano-multilayer film, for absorbing the plane wave of positive normal direction incident, can be applicable to surperficial antireflection or electromagnetic absorbing detection in electromagnetic wave device technology.
Background technology:
In military field, the Main Function of inhaling wave technology is to realize stealthy to radar of weaponry and military installations, and along with the develop rapidly of high-resolution and the advanced Detection Techniques of high reliability, the development of stealth technology has also welcome new challenge.The raising of stealth technology status has also promoted the development of absorbing material technology greatly.At civil area, inhale wave technology and playing an important role aspect electromagnetic compatibility and electromagnetic protection, along with the variation day by day of electromagnetic environment and gradually complicated, the difficulty of electromagnetic compatibility and electromagnetic protection is also continuing to increase.Therefore, research and develop the important topic that high performance absorbing material has become these technical fields.Tradition absorbing material is because its weight is heavier, structural parameters and wave-absorbing effect be easy-regulating not, range of application has been subject to greatly great restriction, so " thin; light, wide, strong " become the main direction of New Type of Wave Absorbing Material, and why artificial electromagnetic compound material receives increasing concern in recent years, main cause is exactly with respect to traditional absorbing material, to have obvious advantage in these directions.
Summary of the invention:
Goal of the invention: the present invention is directed to the deficiency in prior art and design, proposed a kind of can be in broad frequency band the artificial absorbing material of electromagnetic wave absorption energy.This artificial absorbing material, not only can absorb the plane wave of forward entrance, also has the various features such as structural parameters are controlled, weight is extremely light, surface area is large, flexible quality.
Technical scheme: the present invention includes two substrates layer by layer, multilayer ferromagnetic material and multilayer dielectricity, substrate plays a supportive role, and replaces the ferromagnetic material/medium of evaporation on it for multilayer.Polyimide film through hot setting is sticked and on cystosepiment, forms substrate, and dielectric layer is silicon dioxide.Ferromagnetic/medium nano-multilayer film is to utilize the auxiliary electron beam evaporation method evaporation of ion on polyimide film, during evaporation in substrate mask film covering plate to form multilayer rectangular cells lattice periodic structure.
The size of periodic structure and thickness are determined by required suction ripple mid-band frequency, should be decided by Electromagnetic Design simulation optimization result.This structure must be the square repetitive of periodic arrangement, and the size of cell and spacing are all adjustable.
Periodic structure can encourage electromagnetic resonance at different frequent points because size is different, by the size that designs and optimize structure, can make the suction ripple frequency of artificial material change accordingly.
Beneficial effect: the present invention 1, compare common single resonance absorbing material, inhale that wavestrip is wide obtains obvious broadening; 2, absorbent structure is simple, and material is convenient to make; 3, raw materials is cheap, is beneficial to and promotes the use of; 4, at " thin, light " aspect, with respect to traditional absorbing material, there is obvious advantage; 5, inhaling ripple band center can regulate and control.
Accompanying drawing explanation:
Fig. 1 be of the present invention ferromagnetic/medium nano-multilayer film absorbing material periodic structure cell schematics.Wherein, the periodic structure length of side is that l, gap are g, and cell total length is d, and polyimide film thickness is h1, and cystosepiment substrate thickness is h2.
Fig. 2 be of the present invention ferromagnetic/medium nano-multilayer film absorbing material periodic structure cross sectional representation.
Fig. 3 is the reflectance spectrum curve chart that the present invention utilizes Electromagnetic Simulation technology to draw.
Fig. 4 is the reflectance spectrum curve chart of actual measurement of the present invention.
Embodiment:
Below in conjunction with accompanying drawing, by specific embodiment, describe technical scheme of the present invention in detail.
Embodiment: first with reference to figure 1, describe of the present invention ferromagnetic/structure chart of medium nano-multilayer film absorbing material.Utilize electron beam evaporation technique, at thickness, be that on the polyimide film of h1 (40 microns), to cover the length of side be the mask plate that l, gap are g, replace evaporation ferromagnetic material/medium, ferromagnetic material layer thickness is a, thickness of dielectric layers is b, by the nano-multilayer film the obtaining cystosepiment that to stick in thickness be h2.The length of l is controlled at 18-24 millimeter, the width of g is controlled at 2-4 millimeter, evaporation ferromagnetic/dielectric layer gross thickness is controlled at below 1.5 microns, wherein ferromagnetic material layers THICKNESS CONTROL is in 20-80 nanometer, thickness of dielectric layers is controlled at 10-40 nanometer, total number of plies is below 21 layers, and cystosepiment length and width are 30 centimetres, and the THICKNESS CONTROL of h2 is at 2-10 millimeter.Because nano-multilayer film absorbing material of the present invention is sticked on complete metallic plate when measuring, can substantially cut off the transmission of electromagnetic wave energy, so the reflectance spectrum of sample can directly reflect the absorbing property of this absorbing material.With reference to Fig. 3, can find to be obtained by Electromagnetic Simulation technology the wave-absorbing effect of all can reach-10db of nano-multilayer film absorbing material of the present invention more than 5GHz.With reference to Fig. 4, be that we provide a representative instance in order to verify its specific performance, design parameter is l=18mm, g=3mm, h1=40 μ m, h2=4mm, a=60nm, b=20nm.Visible in actual measurement, wave-absorbing effect at 5GHz to can reach-10db in the frequency band of 15GHz, substantially identical with simulation result, it should be noted that, the present embodiment is compared simulation result can see at high band having second absworption peak, and single resonance structural wave-absorbing material has obvious broadened bandwidth ability relatively, and can pass through all technical of regulon structure, control respectively low frequency and high band absworption peak change in location, and reach the wide and wave-absorbing effect of the suction wavestrip of wanting.
The above, be only the preferred embodiments of the present invention, can not limit scope of the invention process with this, i.e. all simple equivalences of doing according to the claims in the present invention and description of the invention content change and modify, and all should still belong to the scope that patent of the present invention covers.
Claims (7)
1. the flexible light weight electromagnetic wave absorption material based on ferromagnetic/medium nanometer multilayer membrane structure, is characterized in that this absorbing material comprises three-decker, and wherein, upper strata is ferromagnetic/medium nano-multilayer film (1); Intermediate layer is polyimide film (2); Lower floor is cystosepiment substrate (3), and electromagnetic wave is from the positive incident of absorbing material structure, and then most of energy can be absorbed by material, only produces a small amount of reflection.
2. absorbing material according to claim 1, ferromagnetic/medium nano-multilayer film (1) adopts the auxiliary electron-beam vapor deposition method evaporation of ion on polyimide film (2), the parameter of cell can regulate by the parameter of mask plate, and recycling glue spraying is affixed on film (1) (2) integral body in cystosepiment substrate (3).
3. absorbing material according to claim 1, can effectively absorb from the electromagnetic wave energy with the positive incident of absorbing material place plane normal direction.
4. absorbing material according to claim 1 has the advantages such as film thickness is little, structural parameters are controlled, weight is extremely light, surface area is large, flexible quality, can stick on body surface, can be for antireflection or the microwave energy absorption of microwave device.
5. absorbing material surface area of sample according to claim 1 is more than or equal to 30 centimetres and takes advantage of 30 centimetres, and the gross thickness of ferromagnetic/dielectric layer should be no more than 1.5 microns.
6. more than absorbing material-10dB Absorber Bandwidth maximum according to claim 1 can reach 10GHz.
7. according to claim 1,, if change ferromagnetic/thickness of dielectric layers, the number of plies, cell size or substrate thickness, inhale ripple frequency band and can toward high frequency or low frequency, move accordingly.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410001244.1A CN103762429A (en) | 2014-01-03 | 2014-01-03 | Soft and light electromagnetic wave absorbing material based on ferromagnetic/medium nano-multilayer film structure |
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| CN201410001244.1A CN103762429A (en) | 2014-01-03 | 2014-01-03 | Soft and light electromagnetic wave absorbing material based on ferromagnetic/medium nano-multilayer film structure |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105277803A (en) * | 2015-12-03 | 2016-01-27 | 哈尔滨幻石科技发展有限公司 | Wall structure for detecting product electromagnetic performance |
| CN110416735A (en) * | 2018-07-16 | 2019-11-05 | 西安电子科技大学 | Flexible multi-layered frequency-selective surfaces with transmission zero |
| CN110896169A (en) * | 2018-09-12 | 2020-03-20 | 南京大学 | Microwave band circular polarization dual-function anisotropic electromagnetic super surface |
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| CN1179875A (en) * | 1995-03-29 | 1998-04-22 | 美国3M公司 | Electromagnetic-power-absorbing composite |
| JP2002348987A (en) * | 2001-05-24 | 2002-12-04 | Ig Tech Res Inc | Electromagnetic wave absorbing foaming body |
| CN101552043A (en) * | 2009-05-12 | 2009-10-07 | 南京大学 | Ferromagnetic thin-film wave absorbing material with periodic structure |
| CN201713474U (en) * | 2010-04-13 | 2011-01-19 | 深圳市海森应用材料有限公司 | Fe/Si3N4 multilayer nanometer film electromagnetic wave absorbing coating |
| CN103427166A (en) * | 2013-08-25 | 2013-12-04 | 南京理工大学 | Broadband microwave absorber based on folded dipole |
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2014
- 2014-01-03 CN CN201410001244.1A patent/CN103762429A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1179875A (en) * | 1995-03-29 | 1998-04-22 | 美国3M公司 | Electromagnetic-power-absorbing composite |
| JP2002348987A (en) * | 2001-05-24 | 2002-12-04 | Ig Tech Res Inc | Electromagnetic wave absorbing foaming body |
| CN101552043A (en) * | 2009-05-12 | 2009-10-07 | 南京大学 | Ferromagnetic thin-film wave absorbing material with periodic structure |
| CN201713474U (en) * | 2010-04-13 | 2011-01-19 | 深圳市海森应用材料有限公司 | Fe/Si3N4 multilayer nanometer film electromagnetic wave absorbing coating |
| CN103427166A (en) * | 2013-08-25 | 2013-12-04 | 南京理工大学 | Broadband microwave absorber based on folded dipole |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105277803A (en) * | 2015-12-03 | 2016-01-27 | 哈尔滨幻石科技发展有限公司 | Wall structure for detecting product electromagnetic performance |
| CN105277803B (en) * | 2015-12-03 | 2018-06-26 | 江山海维科技有限公司 | For the wall construction of product electromagnetic performance detection |
| CN110416735A (en) * | 2018-07-16 | 2019-11-05 | 西安电子科技大学 | Flexible multi-layered frequency-selective surfaces with transmission zero |
| CN110896169A (en) * | 2018-09-12 | 2020-03-20 | 南京大学 | Microwave band circular polarization dual-function anisotropic electromagnetic super surface |
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Application publication date: 20140430 |