CN103490171A - Composite wave-absorbing material with wide frequency bands - Google Patents
Composite wave-absorbing material with wide frequency bands Download PDFInfo
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- CN103490171A CN103490171A CN201310482280.XA CN201310482280A CN103490171A CN 103490171 A CN103490171 A CN 103490171A CN 201310482280 A CN201310482280 A CN 201310482280A CN 103490171 A CN103490171 A CN 103490171A
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Abstract
The invention discloses a composite wave-absorbing material with wide frequency bands. The wave-absorbing material comprises a floor slab, dielectric slab, a frequency selection surface and a matrix wave-absorbing material layer, wherein the floor slab is arranged at the lower surface of the dielectric slab; the frequency selection surface is arranged on the upper surface of the dielectric slab; the matrix wave-absorbing material layer is applied onto the frequency selection surface; the frequency selection surface is provided with a plurality of passive resonance units; each passive resonance unit is in a Jerusalem cross hole-shaped structure; the plurality of passive resonance units are cyclically arranged to form the frequency selection surface with holes, and an RLC (Radio Link Control) parallel circuit is formed. The composite wave-absorbing material can achieve the reduction of radar cross sections within a wide frequency band range, and has the advantages of being simple in structure, excellent in stability and easy to realize.
Description
Technical field
The present invention relates to the frequency selecting surface technique field in absorbing material, be specifically related to a kind of compound broadband band absorbing material, for electromagnetic wave absorption, reduce RCS, the electromagnetism of realize target is stealthy.
Background technology
The research of the electromagnetism stealth technology that to control target RCS be purpose is long-standing, mainly contains four kinds for the control device of common target RCS, that is: shaping technique, Coated With Absorbing Material, passive offseting and active cancellation techniques.Wherein, shaping technique and Coated With Absorbing Material are that the most often to use be also the most effective two kinds of means.Coated With Absorbing Material is to be applied to the earliest military field, in order to realize the stealthy Main Means of armament systems or its radar.Along with the develop rapidly of Detection Techniques, oneself becomes the primary study object of each major country of the world stealth technology.And, along with the lifting day by day of stealth technology status, research and develop the important topic that high performance absorbing material has become military technological field.Absorbing material refers to and can pass through self absorption to microwave energy, reduces the material in radar scattering cross section.At present, the absorbing material main direction of studying is: take composite material as basis, and the multifunctional material grown up thereon.Require it also to have the functions such as anticorrosion, moisture-proof, high temperature resistant, carrying concurrently when inhaling ripple.Widen frequency band, high efficiency, do not increase passive weight, the plastic various complex-shaped features such as parts, be the main development direction of current absorbing material.Composite wave-suction material is mainly to be composited by the basis material with absorbing property, reinforcing material or comb core etc.Its top layer has good wave penetrate capability, the loss absorbed layer of intermediate layer for decaying and designing, and bottom is total reflection layer, and overall structure is followed the design concept of " thin, light, wide, strong ".But volume, weight and the cost of existing absorbing material are larger at present, and absorbing property can be subject to applying the impact of time error and unstable, and inhale the ripple frequency band and generally be no more than 40%, make in the broad frequency band scope threatening radar wave to realize absorbing well extremely difficult.
Summary of the invention
The object of the invention is to overcome above-mentioned the deficiencies in the prior art, a kind of compound broadband band absorbing material is provided, by being combined with frequency-selective surfaces, utilize the periodic arrangement of the passive resonance unit combination arranged to guarantee to realize the optimization of absorbing material absorbing property and the broadening of inhaling the ripple frequency band in the situation that the volume of absorbing material, weight and cost variation are less.
The absorption mechanism of absorbing material is electromagnetic wave and matter interaction, and as black object effectively absorbs heat energy, the electromagnetic wave of incident is converted to heat energy or other forms of energy by absorbing material, thereby reduces to greatest extent the radar echo energy.The single screen that frequency-selective surfaces (FSS) is comprised of a large amount of passive resonance unit or multi-screen cyclic array structure, it by the metal patch unit of periodic arrangement or on metal screen the aperture of periodic arrangement form, its performance is similar to the logical or band stop filter of band in circuit.By shape, the size that changes each unit, can make this structure there is different resonance frequencys, thereby the electromagnetic transmission in space or reflection are had to frequency selectivity matter.
The absorbing property that radar absorbing will have must possess two conditions: when radar wave incides absorbing material inside, energy loss will be tried one's best greatly; The impedance of absorbing material will be complementary with the wave impedance of free space.Meeting first condition can select dielectric constant and the higher absorbent of magnetic permeability imaginary part to realize; Meet second condition, thereby electromagnetic parameter that can be by the impedance of regulating resistance sheet, material and material thickness change input impedance and realize the impedance matching condition, and what wherein the most easily regulate is the impedance of resistor disc, what extensively adopt at present is also this impedance matching mode.If but frequency-selective surfaces be incorporated in the design of absorbing material can realize more easily the impedance matching condition.The present invention combines absorbing material and frequency-selective surfaces, to reach the original absorbing material of broadening on a large scale, inhales the wide effect of wavestrip.
To achieve these goals, the technical solution used in the present invention is as follows:
A kind of compound broadband band absorbing material, comprise floor, dielectric-slab, frequency-selective surfaces and matrix absorbing material layer, the lower surface of described dielectric-slab is located on described floor, described frequency-selective surfaces is located at the upper surface of described dielectric-slab, described matrix absorbing material layer is coated on described frequency-selective surfaces, described frequency-selective surfaces is provided with some passive resonances unit, described passive resonance unit is cross aperture, Jerusalem shape structure, to after some described passive resonances unit periodic arrangement, become aperture type frequency-selective surfaces, and form the RLC parallel circuits.
It should be noted that, described aperture type frequency-selective surfaces is that two-dimension periodic is arranged.
Need to further illustrate, described frequency-selective surfaces is by row * row (N * M) individual cell formation, N >=3 wherein, M >=3; Further, described frequency-selective surfaces forms the RLC parallel circuits, wherein capacitor C and inductance L are mainly determined by geometry and the size of frequency-selective surfaces structure, impedance R derives from metal loss and radiation loss, select structure and the size of rational frequency-selective surfaces, obtain suitable equivalent inductance L, capacitor C and resistance R, the composite construction of absorbing material can absorb preferably incident electromagnetic wave in certain frequency range.
Beneficial effect of the present invention is:
1, the present invention is owing to having loaded frequency-selective surfaces, in the situation that the volume of absorbing material, weight and cost change and littlely can realize wave-absorbing effect preferably, simple in structure, is easy to realize;
2, the present invention is owing to having used the structure that matrix absorbing material and frequency-selective surfaces are combined, broadening the suction wavestrip of absorbing material wide, inhale that wavestrip is wide reaches 105.2%;
3, the present invention, due to frequency-selective surfaces and matrix absorbing material are carried out to integrated design, has avoided alignment error and has affected it reducing performance, reduces stable performance;
4, the present invention, because the frequency-selective surfaces number of unit is chosen flexibly, makes this broadband absorbing material overall size adjustable, can need to determine according to actual size.
The accompanying drawing explanation
Fig. 1 is the structural representation that frequency-selective surfaces of the present invention is combined with the matrix absorbing material;
The structural representation that Fig. 2 is cross aperture, Fig. 1 frequency-selective surfaces Jerusalem type;
Fig. 3 is perspective view of the present invention;
Fig. 4 is RLC equivalent electric circuit syndeton schematic diagram of the present invention;
Fig. 5 is S of the present invention
11s with former absorbing material
11comparison diagram.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described; it should be noted that; the present embodiment is implemented take technical solution of the present invention under prerequisite, provided detailed execution mode and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
As Fig. 1, shown in Fig. 2, the present invention is a kind of compound broadband band absorbing material, comprise floor 1, dielectric-slab 2, frequency-selective surfaces 3 and matrix absorbing material layer 4, the lower surface of described dielectric-slab 2 is located on described floor 1, described frequency-selective surfaces 3 is located at the upper surface of described dielectric-slab 2, described matrix absorbing material layer 4 is coated on described frequency-selective surfaces 3, described frequency-selective surfaces 3 is provided with some passive resonances unit, described passive resonance unit is cross aperture, Jerusalem shape structure, to after some described passive resonances unit periodic arrangement, become aperture type frequency-selective surfaces, and formation RLC parallel circuits.
It should be noted that, described aperture type frequency-selective surfaces is that two-dimension periodic is arranged.Wherein the thin metal frame line of periphery forms required inductance L, and forms required capacitor C by gap between each passive resonance unit, just forms the RLC parallel circuits.Say further, capacitor C and inductance L are mainly determined by geometry and the size of frequency-selective surfaces structure, impedance R derives from metal loss and radiation loss, therefore, select rational frequency-selective surfaces structure and size, obtain suitable equivalent inductance L, capacitor C and resistance R, the composite construction of absorbing material can absorb preferably incident electromagnetic wave in certain frequency band.
As shown in Figure 3, the frequency-selective surfaces in the present invention is by row * row (N * M) individual cell formation, N >=3, M >=3.As a kind of signal, in figure, value is N=5, M=5.
As a kind of preferred scheme, cell size of the present invention can be length and the wide 4mm of being on floor 1; The material that dielectric-slab 2 adopts is FR4, and dielectric constant is 4.4, the length of dielectric-slab and wide be 4mm, thickness is 1.5mm; As shown in Figure 2, long and wide W is 4mm; Middle cross gap width a is 0.14mm, along the gap length b on four limits, is 2mm, and width d is 0.4mm, with the gap g on limit be 0.04mm; The absorbing material coating is long and wide is 4mm, and thickness is 1.2mm, and dielectric constant is ε '=20.3, and magnetic permeability is μ '=3.55, and the electrical loss angle is tan δ
d=0.2266, magnetic loss angle is tan δ
m=0.4422.
In order further to understand effect of the present invention, can be by following theory analysis and simulation result shows:
1, theory analysis
According to transmission line theory, in Fig. 3, structural equivalents is transmission line circuit as shown in Figure 4, and it is d that matrix absorbing material layer and dielectric-slab are equivalent to respectively length
1, d
2defeated line, the characteristic impedance of its transmission line determines by corresponding wave impedance, and frequency-selective surfaces is equivalent to the RLC parallel circuits, and metallic plate is equivalent to terminal short circuit, capacitor C and inductance L are mainly by geometry and the size decision of FSS structure, and impedance R derives from metal loss and radiation loss.
According to transmission line theory, the reflection coefficient Γ of this broadband absorbing material can be calculated by following formula:
Wherein,
for the input impedance of total, and Z
2for the input impedance of FSS surface, can be calculated by following formula,
η in formula
0, η
1, η
2be respectively the wave impedance of free space, absorbing material and medium basic unit, k
1and k
2wave vector while propagating in absorbing material and medium basic unit for electromagnetic wave.Known by above-mentioned qualitative analysis, select rational FSS structure and size, obtain suitable equivalent inductance, electric capacity and resistance, the composite construction of absorbing material can absorb preferably incident electromagnetic wave in certain frequency range.
2, simulation result
Be illustrated in figure 5 S of the present invention
11s with the matrix absorbing material
11comparison diagram.This shows, the absworption peak of matrix absorbing material itself is at 6.5GHz, and absorption peak is-14dB, in the frequency band of 5.4GHz～7.8GHz, and be less than-10dB of reflection coefficient, bandwidth is 36.5%; After loading the FSS structure, because the resonance peak of frequency-selective surfaces and the absworption peak of absorbing material interact, two absworption peaks have appearred in reflection coefficient, and first absworption peak is at 5.1GHz, absorption peak is-19.5dB,, second absworption peak is at 8.8GHz, and absorption peak is-27dB, absorbing property obviously strengthens, in this frequency band of 4.6GHz～14.8GHz, all be less than-lOdB of reflection coefficient, bandwidth reaches 105.2%.
The above, be only preferred embodiment of the present invention, do not form any limitation of the invention, obviously under design of the present invention, anyone can content according to the present invention modify, be equal to and replaces and improvement etc., but these all still belong in the scope that the present invention contains.
Claims (2)
1. a compound broadband band absorbing material, comprise floor, dielectric-slab, frequency-selective surfaces and matrix absorbing material layer, the lower surface of described dielectric-slab is located on described floor, described frequency-selective surfaces is located at the upper surface of described dielectric-slab, described matrix absorbing material layer is coated on described frequency-selective surfaces, it is characterized in that, described frequency-selective surfaces is provided with some passive resonances unit, described passive resonance unit is cross aperture, Jerusalem shape structure, to after some described passive resonances unit periodic arrangement, become aperture type frequency-selective surfaces, and formation RLC parallel circuits.
2. compound broadband band absorbing material according to claim 1, is characterized in that, described aperture type frequency-selective surfaces is that two-dimension periodic is arranged.
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103985967A (en) * | 2014-05-12 | 2014-08-13 | 电子科技大学 | Edge scattering restraining method based on combined loading of microwave absorption foam and gradual change impedance strips |
| CN104993247A (en) * | 2015-06-01 | 2015-10-21 | 东南大学 | Anisotropy dual-polarization illusion and stealthy artificial electromagnetic surface |
| CN105655721A (en) * | 2015-08-03 | 2016-06-08 | 西安电子科技大学 | Double-waveband composite broadband wave absorbing material based on frequency selective surface |
| CN106572625A (en) * | 2016-11-09 | 2017-04-19 | 上海无线电设备研究所 | Novel reflection-absorption integrated electromagnetic shielding structure |
| CN107257033A (en) * | 2017-07-18 | 2017-10-17 | 东南大学 | The multiband wave absorbing device realized based on high impedance surface |
| CN107946761A (en) * | 2017-11-03 | 2018-04-20 | 吉林化工学院 | A kind of iron-based wave-absorber based on bandpass-type frequency-selective surfaces |
| CN108832303A (en) * | 2018-06-07 | 2018-11-16 | 西安电子科技大学 | A kind of frequency-selective surfaces that high angle is stable |
| CN109088172A (en) * | 2018-08-20 | 2018-12-25 | 成都邑电信息技术服务有限公司 | A kind of detail three bands complex type absorbent structures of load based on frequency-selective surfaces |
| CN109509978A (en) * | 2018-12-21 | 2019-03-22 | 海宁利伊电子科技有限公司 | High-performance mobile communication antenna cover |
| CN110943301A (en) * | 2019-12-12 | 2020-03-31 | 中国科学院长春光学精密机械与物理研究所 | Cross-scale double-band-pass frequency selection surface, and periodic unit and design method thereof |
| CN111362702A (en) * | 2020-03-17 | 2020-07-03 | 中国工程物理研究院激光聚变研究中心 | Preparation method of SiOC radar type wave-absorbing material |
| CN111987449A (en) * | 2020-07-28 | 2020-11-24 | 惠州市德赛西威智能交通技术研究院有限公司 | Radar antenna array structure with low side lobe |
| CN113540819A (en) * | 2021-07-12 | 2021-10-22 | 上海大学 | Wave absorbing structure based on jea cold cross pattern |
| CN116613539A (en) * | 2023-07-19 | 2023-08-18 | 南京振微新材料科技有限公司 | Honeycomb cross-frequency-band broadband wave absorber based on super surface |
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103985967B (en) * | 2014-05-12 | 2016-06-29 | 电子科技大学 | Based on the edge scatter suppressing method inhaling ripple foam and gradual change impedance strip Combined Loading |
| CN103985967A (en) * | 2014-05-12 | 2014-08-13 | 电子科技大学 | Edge scattering restraining method based on combined loading of microwave absorption foam and gradual change impedance strips |
| CN104993247A (en) * | 2015-06-01 | 2015-10-21 | 东南大学 | Anisotropy dual-polarization illusion and stealthy artificial electromagnetic surface |
| CN105655721A (en) * | 2015-08-03 | 2016-06-08 | 西安电子科技大学 | Double-waveband composite broadband wave absorbing material based on frequency selective surface |
| CN106572625A (en) * | 2016-11-09 | 2017-04-19 | 上海无线电设备研究所 | Novel reflection-absorption integrated electromagnetic shielding structure |
| CN107257033A (en) * | 2017-07-18 | 2017-10-17 | 东南大学 | The multiband wave absorbing device realized based on high impedance surface |
| CN107946761A (en) * | 2017-11-03 | 2018-04-20 | 吉林化工学院 | A kind of iron-based wave-absorber based on bandpass-type frequency-selective surfaces |
| CN108832303B (en) * | 2018-06-07 | 2019-11-15 | 西安电子科技大学 | A kind of frequency-selective surfaces that high angle is stable |
| CN108832303A (en) * | 2018-06-07 | 2018-11-16 | 西安电子科技大学 | A kind of frequency-selective surfaces that high angle is stable |
| CN109088172A (en) * | 2018-08-20 | 2018-12-25 | 成都邑电信息技术服务有限公司 | A kind of detail three bands complex type absorbent structures of load based on frequency-selective surfaces |
| CN109509978A (en) * | 2018-12-21 | 2019-03-22 | 海宁利伊电子科技有限公司 | High-performance mobile communication antenna cover |
| CN110943301A (en) * | 2019-12-12 | 2020-03-31 | 中国科学院长春光学精密机械与物理研究所 | Cross-scale double-band-pass frequency selection surface, and periodic unit and design method thereof |
| CN111362702A (en) * | 2020-03-17 | 2020-07-03 | 中国工程物理研究院激光聚变研究中心 | Preparation method of SiOC radar type wave-absorbing material |
| CN111362702B (en) * | 2020-03-17 | 2022-05-17 | 中国工程物理研究院激光聚变研究中心 | Preparation method of SiOC radar type wave-absorbing material |
| CN111987449A (en) * | 2020-07-28 | 2020-11-24 | 惠州市德赛西威智能交通技术研究院有限公司 | Radar antenna array structure with low side lobe |
| CN113540819A (en) * | 2021-07-12 | 2021-10-22 | 上海大学 | Wave absorbing structure based on jea cold cross pattern |
| CN116613539A (en) * | 2023-07-19 | 2023-08-18 | 南京振微新材料科技有限公司 | Honeycomb cross-frequency-band broadband wave absorber based on super surface |
| CN116613539B (en) * | 2023-07-19 | 2023-09-22 | 南京振微新材料科技有限公司 | Honeycomb cross-frequency-band broadband wave absorber based on super surface |
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