CN104716440A - Electromagnetic wave absorber structure based on magnetic film and design method thereof - Google Patents
Electromagnetic wave absorber structure based on magnetic film and design method thereof Download PDFInfo
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- CN104716440A CN104716440A CN201510138232.8A CN201510138232A CN104716440A CN 104716440 A CN104716440 A CN 104716440A CN 201510138232 A CN201510138232 A CN 201510138232A CN 104716440 A CN104716440 A CN 104716440A
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Abstract
The invention belongs to the technical field of electronic materials, in particular to a multi-layer patterned electromagnetic wave absorber with a magnetic film. According to the wave absorber, the bottom layer is a metal plate, a multi-layer stacked composite unit structure composed of a square flexible substrate the patterned magnetic film is arranged above the bottom layer, the center of the square flexible substrate coincides with the center of the magnetic film, a magnetic film unit is square, the side length of the magnetic film unit is smaller than the side length of the substrate, and a hollow-square-shaped patterned structure is formed by the magnetic film unit and the substrate. The overall thickness of the multi-layer stacked composite unit structure is not larger than 0.5 mm, the side length A of the magnetic film unit is smaller than or equal to 1 cm, the gap between the magnetic film and the flexible substrate is R, the thickness of the flexible substrate is D, and the gap ratio of the film A/R is larger than or equal to 10:5 and is equal to or smaller than 15:1. The relative dielectric constant of the flexible substrate is 2.5, and the relative permeability of the flexible substrate is 1. The wave absorber has the advantages that the technique is simple, operability is high, cost is low, malleability is high, and the wave absorber can be directly attached to a rubber patch.
Description
Technical field
The invention belongs to technical field of electronic materials, particularly electromagnetic wave absorption structure and method for designing thereof.
Background technology
Stealth technology, as most important in modern war, the most effective air defense penetration tactics technological means, is subject to the great attention of countries in the world.And radar absorbing (RAM) effectively can reduce the RCS (RCS) of target, in stealth technology, occupy very important status.Current absorbing material is mainly to wide spectrum, multi-functional, lighting, slimming and intelligent direction development, and the subject matter of existence and difficult point improve the absorptivity of S and C-band (2GHz ~ 6GHz).
In order to effectively improve the absorbent properties of electromagnetic wave absorption body, people propose various different design respectively.Comprising Meta Materials wave-absorber, frequency-selective surfaces (FSS), ferromagnetic wave-absorber etc.The Meta Materials wave-absorber be made up of planar metal resonant cavity is due to the assimilation effect of the more difficult acquisition wideband of its resonance mechanism, and frequency-selective surfaces can reach a better wideband assimilation effect after optimal design, but its maximum deficiency thicker volume requirement not meeting absorbing material slimming and propose that is thickness.And ferromagnetic material and the composite construction that is made up of them can be used to absorb electromagnetic scattering equally.But traditional absorbing material is owing to being subject to the restriction of Snooker formula, improving its magnetic permeability at microwave frequency band has very large difficulty.And thin-film material can break through the Snooker limit due to its special architectural characteristic, realizes the technical requirements such as the lighting of absorbing material, slimming, be more and more subject to people's attention while being expected to realize high magnetic permeability in high frequency.
Theoretical research and the results show, the most effective technological approaches of head it off is exactly the magnetic permeability and the magnetic loss that improve radio-radar absorber.Thin-film material limits because its special architectural characteristic can break through Snooker, the technical requirements such as the lighting of absorbing material, slimming are realized while being expected to realize high magnetic permeability in high frequency, but cause impedance mismatching because magnetic membrane material has higher conductivity usually, make electromagnetic wave not easily enter thin-film material inside, which greatly limits the application of thin-film material in microwave frequency band particularly ghz band.This is also at present ferromagnetic thin film is used for absorbent structure Important Problems to be solved and difficulties.
Summary of the invention
For above-mentioned existing problems, the invention provides a kind of multi-layer graphical magnetic thin film electromagnetic wave absorption body and method for designing thereof.
Multi-layer graphical magnetic thin film electromagnetic wave absorption body, bottom is metal plate, more than bottom is the multiple-level stack recombiner unit structure of square flexible substrate and patterned magnetic film; Wherein square flexible substrate and magnetic thin film center superposition, magnetic thin film unit is the square that the length of side is less than substrate, and the two forms three-back-shaped patterned structures.Gross thickness H=(L+D) * n≤0.5mm of multiple-level stack recombiner unit structure, wherein 10≤n≤100, length of side A≤the 1cm of magnetic thin film unit, the gap of magnetic thin film and flexible substrate is R, flexible substrate thickness is D, magnetic film thickness L≤0.5 μm, film gap is than 10:5≤A/R≤15:1.Wherein the relative dielectric constant of flexible substrate is 2.5, and relative permeability is 1.
The method for designing of multi-layer graphical magnetic thin film electromagnetic wave absorption body, comprises the following steps:
Step one, carry out cutting to flexible substrate, be cut into the square that the length of side is M, M=A+R, A≤1cm, film gap is than 10:5≤A/R≤15:1;
Step 2, adopt the method for magnetron sputtering, plate FeCo base magnetic material on flexible substrate top layer, form the magnetic thin film of one deck on its surface, its thickness L≤0.5 μm, obtain the single layer cell structure that flexible substrate and magnetic thin film are formed.
Step 3, first by smooth being pasted onto on metal plate of single layer cell structure prepared by step 2, and then the stickup that multiple single layer cell structure stacks gradually is become MULTILAYER COMPOSITE cellular construction, obtain multi-layer graphical magnetic thin film electromagnetic wave absorption body.
The microwave absorbing property of multi-layered magnetic film wave-absorber depends primarily on the cell size of the Thinfilm pattern of wave-absorber, pattern interval ratio, the content etc. of the magnetisable material in multilayer absorber.But, the variable must considered when adopting multilayer and patterned method to have also been introduced a large amount of design multi-layer graphical film wave-absorber while effective raising film-type absorbing material absorptivity, such as, magnetic film thickness is selected, the gap ratio of pattern, and the design parameter of pattern unit size.Optimize gap ratio, the magnetic film thickness of the pattern of multi-layered magnetic film wave-absorber, and pattern unit size design parameter, obtain ultra-wideband to become, technical problem that ultra-thin absorbent structure must solve.
In sum, owing to have employed technique scheme, the invention has the beneficial effects as follows:
1, technique is simple, workable, and cost is lower;
2, material therefor is mainly flexible substrate, and therefore ductility is good;
3, thinner thickness, 100 layers of combining structure gross thickness are only 0.5mm.Directly and rubber paster compound, the low frequency absorbent properties of rubber paster can be improved.
4, by multiple-layer stacked, effectively can increase the content of magnetisable material, and then improve the absorbent properties of multilayer absorber;
5, do not changing under thickness prerequisite, by adjustment square pattern size, can absorbing property regulated and controled.
Accompanying drawing explanation
Examples of the present invention will be described by way of reference to the accompanying drawings, wherein:
Fig. 1 is the MULTILAYER COMPOSITE cellular construction vertical view of medium and magnetic thin film;
Fig. 2 is the MULTILAYER COMPOSITE cellular construction end view of medium and magnetic thin film;
Fig. 3 is the end view that the MULTILAYER COMPOSITE cellular construction of medium and magnetic thin film is loaded on metal base plate;
Fig. 4 is the reflectance curve of 100 layers of stacking wave-absorber of combining structure;
Reference numeral: the unit length of side-A of magnetic thin film, the gap-R of magnetic thin film and flexible substrate, flexible substrate thickness-D, magnetic film thickness-L.
Embodiment
Embodiment 1:
A kind of 100 layers of square pattern absorbent structure, its concrete dimensional parameters is: L=0.5 μm, D=4.5 μm, A=1cm, A:R=15:1, and gross thickness is 0.5mm.
The electromagnetic wave absorption body obtained by described patten's design, in vertical incidence TE or TM ripple situation, has absorbing property as shown in Figure 3.Have the reflection coefficient of below-4dB in the whole frequency range of 3.5-18GHz, wherein 4-18GHz frequency range has the reflection coefficient of below-6dB, and maximum suction wave number has the reflection coefficient of about-19dB under 6GHz.
Embodiment 2:
A kind of 50 layers of square pattern absorbent structure, its concrete dimensional parameters is: L=0.5 μm, D=9.5 μm, A=1cm, A:R=10:1.Gross thickness is 0.5mm.
The electromagnetic wave absorption body obtained by described patten's design, in vertical incidence TE or TM ripple situation, have the reflection coefficient of below-3dB in the whole frequency range of 2-18GHz, maximum suction wave number has the reflection coefficient of about-7dB under 5GHz.
Embodiment 3:
A kind of 100 layers of square pattern absorbent structure, its concrete dimensional parameters is: L=0.5 μm, D=4.5 μm, A=1cm, A:R=10:1.Gross thickness is 0.5mm.
The electromagnetic wave absorption body obtained by described patten's design, in vertical incidence TE or TM ripple situation, have the reflection coefficient of below-4dB in the whole frequency range of 5-18GHz, maximum suction wave number has the reflection coefficient of about-12.5dB under 7GHz.
Embodiment 4:
A kind of 25 layers of square pattern absorbent structure, its concrete dimensional parameters is: L=0.5 μm, D=19.5 μm, A=1cm, A:R=15:1.Gross thickness is 0.5mm.
The electromagnetic wave absorption body obtained by described patten's design, in vertical incidence TE or TM ripple situation, have the reflection coefficient of below-1dB in the whole frequency range of 2-18GHz, maximum suction wave number has the reflection coefficient of about-4.5dB under 4GHz.
Claims (2)
1. a multi-layer graphical magnetic thin film electromagnetic wave absorption body, bottom is metal plate, it is characterized in that: the multiple-level stack recombiner unit structure more than bottom being square flexible substrate and patterned magnetic film; Wherein square flexible substrate and magnetic thin film center superposition, magnetic thin film unit is the square that the length of side is less than substrate, and the two forms three-back-shaped patterned structures; Gross thickness H=(L+D) * n≤0.5mm of multiple-level stack recombiner unit structure, wherein 10≤n≤100, flexible substrate thickness is D≤50 μm, magnetic film thickness L≤0.5 μm; Length of side A≤the 1cm of magnetic thin film unit, the gap of magnetic thin film and flexible substrate is R, and film gap is than 10:5≤A/R≤15:1; Wherein the relative dielectric constant of flexible substrate is 2.5, and relative permeability is 1.
2. the method for designing of multi-layer graphical magnetic thin film electromagnetic wave absorption body as claimed in claim 1, comprises the following steps:
Step one, carry out cutting to flexible substrate, be cut into the square that the length of side is M, M=A+R, A≤1cm, film gap is than 10:5≤A/R≤15:1;
Step 2, adopt the method for magnetron sputtering, plate FeCo base magnetic material on flexible substrate top layer, form the magnetic thin film of one deck on its surface, its thickness L≤0.5 μm, obtain the single layer cell structure that flexible substrate and magnetic thin film are formed;
Step 3, first by smooth being pasted onto on metal plate of single layer cell structure prepared by step 2, and then the stickup that multiple single layer cell structure stacks gradually is become MULTILAYER COMPOSITE cellular construction, obtain multi-layer graphical magnetic thin film electromagnetic wave absorption body.
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| CN201510138232.8A CN104716440A (en) | 2015-03-27 | 2015-03-27 | Electromagnetic wave absorber structure based on magnetic film and design method thereof |
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| CN201510138232.8A CN104716440A (en) | 2015-03-27 | 2015-03-27 | Electromagnetic wave absorber structure based on magnetic film and design method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108933335A (en) * | 2018-08-18 | 2018-12-04 | 南昌大学 | A kind of new method of regulation radar absorbing absorption frequency |
| CN109766630A (en) * | 2019-01-08 | 2019-05-17 | 电子科技大学 | A kind of effective electromagnetic parameter extracting method of honeycomb absorbing material |
| US10821486B2 (en) | 2015-11-05 | 2020-11-03 | Airbus Defence and Space GmbH | Microelectronic module for cleaning a surface, module array, and method for cleaning a surface |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2009076802A (en) * | 2007-09-25 | 2009-04-09 | Mitsubishi Cable Ind Ltd | Radio wave absorber |
| CN202949042U (en) * | 2012-12-14 | 2013-05-22 | 北京康拓科技有限公司 | Electromagnetic wave-absorbing material of Fe/SiO2 nano-multilayer film |
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2015
- 2015-03-27 CN CN201510138232.8A patent/CN104716440A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009076802A (en) * | 2007-09-25 | 2009-04-09 | Mitsubishi Cable Ind Ltd | Radio wave absorber |
| CN202949042U (en) * | 2012-12-14 | 2013-05-22 | 北京康拓科技有限公司 | Electromagnetic wave-absorbing material of Fe/SiO2 nano-multilayer film |
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| 张辉彬: "《基于电磁谐振的宽频周期吸波结构设计》", 《中国博士学位论文全文数据库》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10821486B2 (en) | 2015-11-05 | 2020-11-03 | Airbus Defence and Space GmbH | Microelectronic module for cleaning a surface, module array, and method for cleaning a surface |
| CN108933335A (en) * | 2018-08-18 | 2018-12-04 | 南昌大学 | A kind of new method of regulation radar absorbing absorption frequency |
| CN108933335B (en) * | 2018-08-18 | 2020-12-22 | 南昌大学 | Novel method for regulating and controlling absorption frequency of radar wave-absorbing material |
| CN109766630A (en) * | 2019-01-08 | 2019-05-17 | 电子科技大学 | A kind of effective electromagnetic parameter extracting method of honeycomb absorbing material |
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Application publication date: 20150617 |