CN103490169A - Single-layered broadband random surface - Google Patents
Single-layered broadband random surface Download PDFInfo
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- CN103490169A CN103490169A CN201310478594.2A CN201310478594A CN103490169A CN 103490169 A CN103490169 A CN 103490169A CN 201310478594 A CN201310478594 A CN 201310478594A CN 103490169 A CN103490169 A CN 103490169A
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Abstract
The invention discloses a single-layered broadband random surface. The random surface comprises a dielectric substrate (2), a windmill metal patch 1 basic unit (1) and a metal floor (3), wherein the windmill metal patch 1 basic unit (1) and the metal floor (3) are respectively coated on the upper surface and lower surface of the dielectric substrate (2); the metal floor (3) is used for preventing electromagnetic wave transmission; the basic unit (1) is formed by using a single-layered double-resonance unit with a randomly distributed size, and composed of a regular square ring located in the center of the unit and a branch-containing square ring located at the periphery of the regular square ring. The random surface disclosed by the invention can be used for effectively reducing the RCS (radar cross-section) of a two-dimensional metal target body in an X waveband; the random surface is simple in manufacturing and easy to operate; the random surface has absolute advantages in comparison with previous multilayer modes, so that the random surface has extremely high application prospect in practice.
Description
Technical field
The present invention relates to a kind of WB-RCS of the individual layer for microwave frequency band (Radar Cross Section RCS) reduction surface, belong to radar invisible and novel artificial electromagnetic material field.
Background technology
The novel artificial electromagnetic material (Metamaterials) related in the present invention is comprised of the sub-wavelength cellular construction periodic arrangement of certain scale, by its cellular construction of artificial design, can control the electromagnetic parameters such as effective dielectric constant, magnetic permeability, refractive index, wave impedance of material, realize the character that material did not have that nature exists.Along with people, to the going deep into of the theoretical research of novel artificial electromagnetic material and application and development, it has also caused numerous researchers' interest in the application in radar invisible field.
The method of radar invisible is to adopt various means to reduce the RCS of target.Traditional method that reduces RCS mainly contains 3 kinds, respectively: configuration design, adopt radar absorbing (Radar Absorbing Material), actively offset, passive offset etc.The reduction of RCS is a kind of compromise research, and its pluses and minuses balance each other.When target surface be trimmed or reorientation when obtaining the RCS reduction, radar cross section reducing on a viewing angle is accompanied by the increase on another viewing angle usually; Use radar absorbing material, by dissipation of energy in material, just can obtain the reduction of radar cross section, and RCS Level hold in the other direction is relatively constant.On the other hand, the use of RAM also take that to increase target weight, volume and surface maintenance problem be cost, and many restrictions are arranged in actual applications.Individual layer broadband random surface is based on the random scatter theory, utilize the individual layer broadband multi resonant structure of shaking, dimensional parameters by the regulon structure, the reflection spike produced when electromagnetic wave is incident to metal plate is to space all directions radiation, the reflected wave of space all directions presents random distribution, make the reflection peak of metal plate significantly reduce, reach the purpose stealthy to it.Individual layer, broadband, to the insensitive random surface of incident direction, than traditional material not only thickness greatly reduce, and can realize the significantly reduction to the backward RCS of incident wave, the resonant element be easy to by utilizing different size, different structure is realized the stealthy of metal target body, and very large potential using value is arranged in stealthy field.
Summary of the invention
Technical problem: the purpose of this invention is to provide a kind of individual layer broadband random surface based on electromagnetic wave random scatter theory.This random surface can be by coming that the adjustment of cell size parameter is realized to the fine setting to unit resonance frequency, thereby change the mirror field phase place of incident wave, in broad frequency band, the mirror field of incident electromagnetic wave is broken up, make the backward RCS of mirror field descend over 10dB, greatly reduce the probability detected by the enemy.Random surface have thin thickness, lightweight, be easy to processing, cost is low, the insensitive and good advantage of Stealth Fighter to incident angle, therefore have very high practical value.
Technical scheme: for solving the problems of the technologies described above, the invention provides a kind of individual layer broadband random surface, this random surface comprises medium substrate, covers respectively elementary cell and the metal floor of this medium substrate upper surface and lower surface; This metal floor is for preventing Electromgnetically-transparent; Described elementary cell adopts the individual layer double resonance cell formation of size random distribution, the regular square ring that is positioned at unit center and the band minor matters Q-RING that is positioned at this Q-RING periphery, consists of.
Preferably, elementary cell, medium substrate and metal floor form individual layer RCS reduction surface jointly.
Preferably, elementary cell is windmill-shaped metal patch, length of side a, dielectric substrate thickness h, the live width g of becket structure used on elementary cell, gap d between the regular square ring of unit center and the band minor matters Q-RING in this Q-RING periphery, above-mentioned parameter is specific as follows: a=15mm, h=4mm, g=0.4mm, d=0.55mm; The regular square ring length of side at center and outer shroud minor matters length are L.
Preferably, the regular square ring length of side at elementary cell center and outer shroud minor matters length are the L random distribution, cause reflected wave phase place random distribution.
Beneficial effect: compared with prior art, advantage of the present invention:
1. the present invention is simple in structure, easy to process, and cost is low.Traditional multi resonant structure of shaking is to utilize the multiple-level stack technology realize the phase shift range of 360 ° and expand the unit bandwidth mostly, yet cost is high, manufactures difficulty, and the strict alignment between each layer is also more loaded down with trivial details.By contrast, the single layer structure production process that the present invention uses is relatively simple, only needs a step photoetching process, not only saves cost, and the mismachining tolerance of having avoided the sandwich construction alignment to cause.
2. the present invention has broadband character.In the 8-12GHz frequency range, make the backward RCS of two-dimensional metallic plate reduce over 10dB.
3. the present invention also has random scatter effect preferably to the electromagnetic wave of large-angle inclined incident.In actual applications, complicated electromagnetic environment, oblique incidence Bob normal incidence ripple is more general, so the electromagnetic environment of the adaptation complexity that the present invention can be good.
4. the present invention possesses the advantages such as portable, easy integrated simultaneously, and is easy to conformal.Thinner, lighter than traditional wave-absorbing and camouflage material.
The accompanying drawing explanation
Fig. 1 a is the individual unit structure front view of individual layer broadband random surface,
Fig. 1 b is the individual unit structure side view of individual layer broadband random surface,
Fig. 1 c is the size marking figure of the individual unit structure of individual layer broadband random surface,
Wherein show the cellular construction length of side a in the present invention, dielectric substrate thickness h, metal live width d, endless metal belt gap g, the interior ring length of side and the long L of outer shroud minor matters can adjust.By adjusting above-mentioned parameter, can control ring in the windmill unit, the resonance frequency of outer shroud, to widen the unit bandwidth, thereby realize the wideband phase shift on the different operating frequency;
Fig. 2 is that electromagnetic wave normal incidence and windmill-shaped unit are got in the situation of different size parameter L, unit reflected phase will and frequency concern simulation result.
Fig. 3 is electromagnetic wave normal incidence and when 10GHz, the relation of windmill-shaped unit phase place and dimensional parameters L.
Fig. 4 is the front schematic view on individual layer, the stealthy surface of artificial electromagnetic, broadband.
The experimental results that Fig. 5 a is individual layer, the stealthy surperficial multi-angle incident of broadband artificial electromagnetic (TE ripple, single station).
The experimental results that Fig. 5 b is individual layer, the stealthy surperficial multi-angle incident of broadband artificial electromagnetic (TM ripple, single station).
The experimental results that Fig. 6 a is individual layer, the stealthy surperficial multi-angle incident of broadband artificial electromagnetic (TE ripple, two stations).
The experimental results that Fig. 6 b is individual layer, the stealthy surperficial multi-angle incident of broadband artificial electromagnetic (TM ripple, two stations).
Wherein have: elementary cell 1; Medium substrate 2; Metal base plate 3;
Windmill-shaped metal patch
Embodiment
The random surface windmill-shaped unit battle array random by size in windmill-shaped individual layer broadband proposed by the invention forms, similar plane reflection battle array structure.
Individual layer broadband random surface is based on the artificial electromagnetic surface of random scatter theory, and its cellular construction is windmill-shaped resonant element and metal backing composition as shown in Figure 1, between double-layer structure, by medium substrate, is separated.Windmill-shaped resonant element is by the regular square ring that is positioned at center and be positioned at peripheral band minor matters Q-RING and form, it is typical double resonance construction unit, the thickness of width, interannular gap size and medium substrate by the appropriate design endless metal belt, make interior ring and the outer shroud of windmill-shaped unit produce resonance respectively on approaching frequency, thereby realize that double resonance reaches the purpose of widening the unit bandwidth.By the size L that changes central square ring and minor matters simultaneously, make electromagnetic wave be random distribution in the reflected wave phase place of metal surface, form diffuse reflection, thereby reduce RCS, be that the reflected phase will that each radiating element produces presents random distribution at 360 degree one-periods, by in-field, very strong reflection peak is dispersed as random, a rambling reflection peak.
Referring to Fig. 1 a-1c, individual layer broadband random surface comprises medium substrate 2, covers respectively elementary cell 1 and the metal floor 3 of these medium substrate 2 upper surfaces and lower surface.This metal floor 3 is for preventing Electromgnetically-transparent.Described elementary cell 1 adopts the combination of individual layer resonant element or the described elementary cell 1 of size random distribution to consist of the double resonance construction unit, the regular square ring that is positioned at unit center and the band minor matters Q-RING that is positioned at this Q-RING periphery, consists of.Seeing intuitively, is exactly a windmill-shaped structure.Characteristics are that individual layer double resonance structure has just reached the broadband performance that covers whole X-band.Need sandwich construction in traditional implementation method, this is of the present invention one large emphasis.
Elementary cell 1, medium substrate 2 and the common formation individual layer of metal floor 3 RCS reduction surface.
Elementary cell 1 length of side a, medium substrate 2 thickness h, the live width g of becket structure used on elementary cell 1, gap d between the regular square ring of unit center and the band minor matters Q-RING in this Q-RING periphery, above-mentioned parameter is specific as follows: a=15mm, h=4mm, g=0.4mm, d=0.55mm; The regular square ring length of side at center and outer shroud minor matters length are L.
The regular square ring length of side at elementary cell 1 center and outer shroud minor matters length are the L random distribution, cause reflected wave phase place random distribution.
Elementary cell 1 forms individual layer RCS reduction surface, and it is overlying on to two-dimensional metallic objective body surface, can in 8-12GHZ, effectively reduce the RCS of two-dimensional metallic objective body.
As shown in Figure 1, Fig. 1 a is the unit front view to windmill-shaped model of element, and windmill-shaped radiation metal paster is etched on individual layer ground connection medium substrate 2; Fig. 1 b is end view, and medium substrate 2 upper and lower surfaces are respectively windmill-shaped metal patch 1 and metal floor 3; In figure, symbol 1-3 represents respectively: windmill-shaped metal patch unit, medium substrate, metal plate.Unit length of side a, dielectric substrate thickness h, metal live width d, endless metal belt gap g, the interior ring length of side and the long L of outer shroud minor matters can adjust, and make ring in the windmill unit, and the resonance frequency of outer shroud approaches, to widen the unit bandwidth.
In Fig. 2, and, when L changes, at 8GHz, in the 12GHz scope, the frequency curve almost parallel of each reflected wave phase place, present a kind of pectinate texture; Under Different L, the S11 phase place has similar frequency response, and can meet L reflected wave phase difference when maximum and minimum value change the excursion of approximate 360 ° is arranged.This behavioral illustrations this paster battle array there is good broadband character.
Figure 3 shows that take the phase place at 10GHz place in Fig. 2 is benchmark, the curved line relation of the reflection coefficient phase at this frequency simulated and patch size L.As can be seen from the figure, both are approximated to dull linear relationship.Because the relation of reflection coefficient phase and chip unit is broadband character, so also there is similar relation in the frequency range of 8GHz-12GHz, with 10GHz, compares phase difference is only arranged.
Fig. 4 is the front schematic view on individual layer, the stealthy surface of artificial electromagnetic, broadband.Can observe that this embodiment is comprised of the 20*20 unit and the unit patch size is not of uniform size, its size is that the dull linear relationship in Fig. 3 obtains, generate at random the phase place random number of one group of 0-360 in Matlab, be converted into the size random number according to the functional relation in Fig. 3, be applied in the paster battle array.
Fig. 5 and Fig. 6 are the RCS reduction figure after electromagnetic wave incident has covered the two-dimensional metallic flat board on this stealthy surface.The result demonstration, at 8-12GHz, in the situation of single station, electromagnetic wave normal incidence and oblique incidence (0 °, 5 °, 10 °, 15 °) time, the metal plate RCS that has covered this invention descends and surpasses 10dB.At 8-13GHz, in the situation of two stations, electromagnetic wave normal incidence and oblique incidence (0 °, 15 °, 30 °, 45 °), the metal plate RCS that has covered this invention descends and surpasses 10dB.
In addition, the present invention also has good RCS decline effect is arranged at the mirror reflection ripple to the wide-angle incident wave.These characteristics make it that larger development prospect be arranged under practical application.
Above description and explained principal character of the present invention, basic principle and advantage of the present invention.The technical staff of the industry should understand, and the present invention is not restricted to the described embodiments, and that in above-described embodiment and specification, describes just illustrates principle of the present invention.Without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications; for example the technical staff can modify so that it is operated in its all band to above-mentioned various parameters; perhaps revise relevant parameter so that its properity and the present embodiment are different, these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is by claim and be equal to and define.
Claims (4)
1. an individual layer broadband random surface, is characterized in that, this random surface comprises medium substrate (2), covers respectively elementary cell (1) and the metal floor (3) of this medium substrate (2) upper surface and lower surface; This metal floor (3) is for preventing Electromgnetically-transparent; Described elementary cell (1) adopts the individual layer double resonance cell formation of size random distribution, the regular square ring that is positioned at unit center and the band minor matters Q-RING that is positioned at this Q-RING periphery, consists of.
2. individual layer according to claim 1 broadband random surface, is characterized in that, elementary cell (1), and medium substrate (2) forms individual layer RCS reduction surface jointly with metal floor (3).
3. individual layer according to claim 1 broadband random surface, it is characterized in that, elementary cell (1) is windmill-shaped metal patch, length of side a, medium substrate (2) thickness h, the live width g of the upper becket structure used of elementary cell (1), gap d between the regular square ring of unit center and the band minor matters Q-RING in this Q-RING periphery, above-mentioned parameter is specific as follows: a=15mm, h=4mm, g=0.4mm, d=0.55mm; The regular square ring length of side at center and outer shroud minor matters length are L.
4. individual layer according to claim 1 broadband random surface, is characterized in that, the regular square ring length of side and the outer shroud minor matters length at elementary cell (1) center are the L random distribution, cause reflected wave phase place random distribution.
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Cited By (9)
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| CN104092022A (en) * | 2014-07-14 | 2014-10-08 | 东南大学 | Broadband random surface and determining method thereof |
| CN104752840A (en) * | 2015-04-08 | 2015-07-01 | 东南大学 | Terahertz broadband random surface |
| CN105823378A (en) * | 2016-05-06 | 2016-08-03 | 浙江大学 | Three-dimensional fully-polarized super-surface invisible cloak |
| CN106252897A (en) * | 2016-08-24 | 2016-12-21 | 江苏赛博防务技术有限公司 | Transparent broadband Meta Materials wave absorbing device |
| CN107181066A (en) * | 2017-05-27 | 2017-09-19 | 西南大学 | A kind of double wideband polarization converters based on the super surface of anisotropy |
| CN108879108A (en) * | 2018-07-06 | 2018-11-23 | 电子科技大学 | A kind of restructural phased array antenna RCS reduction method that polarized based on scattering |
| CN109560389A (en) * | 2018-11-22 | 2019-04-02 | 中国人民解放军空军工程大学 | The Broadband RCS for offseting method based on novel scattering reduces super surface |
| CN114597671A (en) * | 2022-03-22 | 2022-06-07 | 电子科技大学 | Optical transparent broadband wave absorber and preparation method thereof |
| CN115395240A (en) * | 2022-08-30 | 2022-11-25 | 西安电子科技大学 | Wave-transparent window switch type liquid metal ATFSS device |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104092022B (en) * | 2014-07-14 | 2016-06-29 | 东南大学 | A kind of broadband random surface and defining method thereof |
| CN104092022A (en) * | 2014-07-14 | 2014-10-08 | 东南大学 | Broadband random surface and determining method thereof |
| CN104752840B (en) * | 2015-04-08 | 2017-06-06 | 东南大学 | A kind of Terahertz broadband random surface |
| CN104752840A (en) * | 2015-04-08 | 2015-07-01 | 东南大学 | Terahertz broadband random surface |
| CN105823378A (en) * | 2016-05-06 | 2016-08-03 | 浙江大学 | Three-dimensional fully-polarized super-surface invisible cloak |
| CN105823378B (en) * | 2016-05-06 | 2017-05-10 | 浙江大学 | Three-dimensional fully-polarized super-surface invisible cloak |
| CN106252897A (en) * | 2016-08-24 | 2016-12-21 | 江苏赛博防务技术有限公司 | Transparent broadband Meta Materials wave absorbing device |
| CN107181066A (en) * | 2017-05-27 | 2017-09-19 | 西南大学 | A kind of double wideband polarization converters based on the super surface of anisotropy |
| CN108879108A (en) * | 2018-07-06 | 2018-11-23 | 电子科技大学 | A kind of restructural phased array antenna RCS reduction method that polarized based on scattering |
| CN109560389A (en) * | 2018-11-22 | 2019-04-02 | 中国人民解放军空军工程大学 | The Broadband RCS for offseting method based on novel scattering reduces super surface |
| CN114597671A (en) * | 2022-03-22 | 2022-06-07 | 电子科技大学 | Optical transparent broadband wave absorber and preparation method thereof |
| CN115395240A (en) * | 2022-08-30 | 2022-11-25 | 西安电子科技大学 | Wave-transparent window switch type liquid metal ATFSS device |
| CN115395240B (en) * | 2022-08-30 | 2023-09-01 | 西安电子科技大学 | Wave-transparent window switch type liquid metal ATFSS device |
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Address after: 210093 Nanjing University Science Park, 22 Hankou Road, Gulou District, Nanjing City, Jiangsu Province Patentee after: Southeast University Address before: 211189 No. 5 Runfa Road, Jiangning District, Nanjing City, Jiangsu Province Patentee before: Southeast University |