CN105244630A - Novel three-dimensional broadband super-light wave-absorbing material and designing method thereof - Google Patents
Novel three-dimensional broadband super-light wave-absorbing material and designing method thereof Download PDFInfo
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- CN105244630A CN105244630A CN201510681300.5A CN201510681300A CN105244630A CN 105244630 A CN105244630 A CN 105244630A CN 201510681300 A CN201510681300 A CN 201510681300A CN 105244630 A CN105244630 A CN 105244630A
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Abstract
The invention discloses a novel three-dimensional broadband super-light wave-absorbing material and a designing method thereof. The wave-absorbing material comprises a metal baseboard, a three-dimensional rotary support and a periodic array which is constituted by square resistor discs on the upper surface. The three-dimensional rotary support is formed by a square planar resistor disc and four rhombic planar resistor discs which are connected. The four rhombic planar resistor discs are connected with four edges of the square planar resistor disc, respectively, and are folded by a certain angle alpha towards the square center along the edges of the square planar resistor disc. The edges of the square planar resistor disc are equal to those of the rhombic planar resistor discs. The square planar resistor disc, the rhombic planar resistor discs and the square resistor discs are made of resistive films. For the situation of vertical and oblique incidence of electromagnetic wave in the TM polarization manner, especially the situation of large angle of incidence of electromagnetic wave, good broadband wave-absorbing effect is achieved.
Description
Technical field
The present invention relates to technical field of electronic materials, be specifically related to a kind of have improve TM ripple large incidence angle absorption can the ultralight absorbing material in new structure broadband.
Background technology
Electromagnetism stealth technology can effectively control or suppress the radar signature signal of target, reduces the probability that target is found, identifies, follows the trail of and destroys, thus improves viability and the fighting efficiency of weaponry.Radar absorbing is a kind of effective means in electromagnetism stealth field, becomes the emphasis that Military Application field is paid close attention to gradually.Meanwhile, electronic product is day by day universal, electromagnetic radiation is almost ubiquitous, and electromagnetism " pollution " problem such as electromagnetic interference and electromagnetic compatibility etc. have become the problem affecting health.Utilize the shielding action of radar absorbing, also can effectively keep out " electromagnetic pollution " in electromagnetic environment.
The periodic array artificial composite material that Meta Materials is normally made up of sub-wavelength cellular construction, has the excellent properties not available for a lot of nature material.The structural design of Meta Materials is incorporated into electromagnetic-wave absorbent, the breakthrough of at least two aspects can be obtained: one, the overall performance of material carries out regulation and control by the architectural characteristic of the periodic unit forming this material, and the performance of traditional absorbing material just determined by the characteristic of composition material itself; Two, the absorbing material that the cellular construction of sub-wavelength gives us design has a ultrathin provides new mentality of designing.Therefore, the electromagnetic-wave absorbent Design & preparation based on metamaterial structure is studied, and is just becoming the focus of Material Field research.
Radar absorbing based on metamaterial structure is a kind of multifunctional composite, pointed strong, absorbing property is good, quality is light, mechanical property meets the advantages such as load bearing requirements, has become the development aspect that contemporary stealth material is important.But, along with improving constantly of detection system performance, new requirement is proposed to radar absorbing wide-angle absorbing property, particularly for the electromagnetic absorbent properties of large incidence angle, become the difficult problem that researcher is anxious to be resolved.At present, some design is by increasing high dielectric layer surface and sandwich construction promotes the stability of radar absorbing to the absorbing property of oblique firing angle, but the absorbing property in wide-angle situation is not still resolved.Along with Meta Materials design is expanded to three-dimensional structure by two dimensional surface, three-dimensional structure is introduced electromagnetic-wave absorbent, and its combination property has more breakthrough.Therefore, the research carrying out three-dimensional structure electromagnetic wave absorption Meta Materials has become one of effective way improving large incidence angle absorbent properties.
Summary of the invention
For solving the problem, the invention provides the ultralight absorbing material in a kind of new structure broadband and method for designing thereof, three-dimensional rotation supporting structure that arranged in the foam medium layer apparatus cycle of traditional resistor-type frequency selection surface wave-absorbing material, that have certain knuckle replaces, thus obtain a three-dimensional structure suction ripple Meta Materials, its upper surface is one deck resistor-type frequency-selective surfaces, and corresponding below each frequency menu unit is the three-dimensional rack of a tool central rotation symmetrical structure.
For achieving the above object, the technical scheme that the present invention takes is:
There is the ultralight absorbing material in three-dimensional structure broadband improving TM ripple large incidence angle absorption energy, comprise metal base plate, the periodic array of the square resistor disc formation of three-dimensional rotation support and upper surface, described three-dimensional rotation supporting structure is made up of the square-shaped planar resistor disc be connected and four diamond-shaped plan resistor discs, four diamond-shaped plan resistor discs are connected with foursquare planar resistor sheet four edges respectively, and turn down certain angle α along the edge of square-shaped planar resistor disc to square center respectively, described square-shaped planar resistor disc is all identical with the length of side of diamond-shaped plan resistor disc, described square-shaped planar resistor disc, diamond-shaped plan resistor disc and square resistor disc process by resistive film.
Wherein, described resistive film to be printed on dielectric film by screen printing technique by conductive carbon paste and to be prepared from, and the thickness of described resistive film is 10 ~ 15um, and sheet resistance value is 140 Ω/sq; Dielectric film is PET film, and thickness requirement is within 0.1mm, and relative dielectric constant real part is 3.8, and imaginary part is 0.018.
Wherein, described four rhombus resistor discs along adjacent 90 ° direction respectively with upper surface resistor disc in the slant setting of (180-α) angle, therefore, this structural rate ordinary two dimensional planar resistor type frequency selection surface wave-absorbing material the is many electric field response of a vertical direction.And then make the electromagnetic wave of this suction ripple Meta Materials to oblique incidence have better wide band absorption characteristic.
Wherein, gained four rhombus resistor discs along adjacent 90 ° direction respectively with metal backing in the slant setting of (180-α) angle.Therefore, there is certain mechanical stability.The resistor-type that the periodic array that this support forms can support upper surface completely selects layer frequently.
Wherein, the square resistor disc of described upper surface is that the resistor-type of square structure selects layer frequently, and the size of each unit is identical with the cell size of three-dimensional rotation support below, and requires that the central shaft of upper and lower two unit overlaps completely when combining.The square resistor disc of upper surface obtains best wideband impedance match by optimizing, in order to realize the electromagnetic wide band absorption to vertical incidence.
Above-mentioned have improve TM ripple large incidence angle absorption can the ultralight absorbing material in three-dimensional structure broadband prepare by the following method:
S1, get a square-shaped planar resistor disc and four rhombus resistor discs, four rhombuses are connected with foursquare four edges respectively, four rhombuses are turned down certain angle along foursquare edge to square center respectively, is then inverted and is put on metallic plate, obtain three-dimensional rotation support;
S2, by three-dimensional rotation supporting structure according to certain cell size do on a metal plate the cycle arrangement, obtain and there is certain thickness three-dimensional structure metamaterial wave-absorber;
S3, enclose the resistor-type frequency-selective surfaces of one deck periodic unit on whole wave-absorber surface, frequently after selecting each unit center of layer to align with each unit center of three-dimensional rotation support the resistance on upper strata, be bonded together, the suction ripple Meta Materials improving the large incidence angle absorbent properties of TM ripple must be had.
The support of this concrete three-dimensional rotation symmetrical structure implemented be have neutral symmetrical and be the construction unit of each diversity of twin shaft.Therefore, this suction ripple Meta Materials must have the irrelevant absorption characteristic of plan to the electromagnetic wave of vertical incidence.Meanwhile, the effect of absorbing property enhancing also must be played for oblique electromagnetic wave.Due to square resistor disc and the tilted-putted rhombus resistor disc acting in conjunction with Rotational Symmetry arrangement below of upper surface, make the TM electromagnetic wave of this absorbent structure to vertical incidence and oblique incidence all have wide band absorption performance, due to four rhombuses along adjacent 90 ° direction respectively with metal backing (or upper surface resistor disc) in the slant setting of (180-α) angle.When incident electromagnetic wave angle is (180-α), now, the electric field on vertical direction and horizontal direction is corresponding is all the strongest.Thus, the Absorber Bandwidth below-10dB is also the widest.By reasonably choosing the angle of (180-α), ripple Meta Materials is inhaled in the broadband that just can obtain for large incidence angle absorbing property the best.
The present invention has following beneficial effect:
1) resistor disc has simple ripe, workable, the lower-cost feature of preparation technology as absorbing material;
2) whole absorbing material quality is very light, and its surface density is 0.023g/cm
2, than filled by foam medium Salisbury screen and Jaumann wave-absorber also little.
3) for the absorption characteristic of oblique firing angle, this suction ripple Meta Materials has the feature contrary with the resistor-type frequency selection surface wave-absorbing material of conventional two-dimensional plane.This absorbing material is along with the increase of oblique incidence angle, and the Absorber Bandwidth below-10dB can increase further.
4) research finds, when oblique electromagnetic incident angle is consistent with the included angle (180-α) of tilting resistor disc, now, reaches maximum for the Absorber Bandwidth below-10dB.
5) absorbing material prepared to incidence angle at 0 ° to the TM polarized wave within the scope of 75 °, there is the wide band absorption performance of 3.6-11.4GHz
Accompanying drawing explanation
Fig. 1 is the machining sketch chart of Rotational Symmetry stent structural element in the embodiment of the present invention;
Fig. 2 is Rotational Symmetry support array structural representation in the embodiment of the present invention;
Fig. 3 is the unit vertical view inhaling ripple Meta Materials in the embodiment of the present invention;
Fig. 4 is the cell side view inhaling ripple Meta Materials in the embodiment of the present invention;
Fig. 5 is the overall structure schematic diagram inhaling ripple Meta Materials in the embodiment of the present invention;
Fig. 6 inhales ripple Meta Materials to be respectively 0 ° for TM polarized wave at incident angle, 25 °, 45 ° in the embodiment of the present invention, 65 ° and 75 ° time S
11figure.
Embodiment
In order to make objects and advantages of the present invention clearly understand, below in conjunction with embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
For convenience of description, the present invention is considered as the resistor-type that the periodic array that is made up of M × N number of three-dimensional rotation symmetric cradle and one deck be made up of M × N number of square resistor disc and frequently selects layer to combine, M is line number, and N is columns.Each periodic unit is that the resistor disc be made up of a square structure and four diamond structures combines.Here resistor disc is mainly made up of resistive film.Resistive film to be printed by screen printing technique with conductive carbon paste to obtain on dielectric film, and its thickness is 10 ~ 15um, and sheet resistance value is about 140 Ω/sq.Dielectric film selects PET film, and its thickness is 0.1mm, and the real part of relative dielectric constant is 3.8, and imaginary part is 0.018.Due to the thinner thickness of dielectric film, in simulation process, dielectric film can not have an impact to the absorbing property of whole absorbing material.
As shown in Figure 1, each Rotational Symmetry support is obtained by folding by the resistor disc of a plane in fact.This planar resistor sheet is by being that a square and four rhombuses are formed.Square is positioned at mid portion, and four rhombuses are adjacent with foursquare four edges respectively.And the foursquare and length of side that is rhombus is a=12.8mm, and the angle of rhombus is β=43.3 °.Then, turned down along foursquare edge to square center respectively by four rhombuses, the angle of turnover is α=115 °, is then inverted and is put on metallic plate, just constitute and have the symmetric supporting structure of three-dimensional rotation.
Three-dimensional rotation supporting structure is done cycle arrangement on a metal plate according to each unit /=31.4mm, obtains and there is certain thickness three-dimensional structure metamaterial wave-absorber, as shown in Figure 2.Meanwhile, the resistor-type enclosing one deck square shaped cells on whole wave-absorber surface is needed frequently to select layer.The foursquare length of side is A=25.8mm, equally also does cycle arrangement according to each unit /=31.4mm.
Finally need the form overlapped by centre coordinate with Rotational Symmetry support by square planar resistor sheet, be pasted together.Obtain as shown in Figures 3 and 4, one is similar to mushroom three-dimensional structure metamaterial unit.When the resistor-type of two dimensional surface selects layer and Rotational Symmetry support array to be pasted together completely frequently, just constitute the suction ripple Meta Materials of three-dimensional structure as shown in Figure 5.
As shown in Figure 6, what obtained by such scheme design aly has the suction ripple Meta Materials improving the large incidence angle absorbent properties of TM ripple, and for incident electromagnetic wave under TM polarization mode, when incidence angle is 0 °, the absorption frequency range of below its-10dB is: 3.6-11.4GHz; When incidence angle is 15 °, the absorption frequency range of below its-10dB is: 3.6-12.5GHz; When incidence angle is 25 °, the absorption frequency range of below its-10dB is: 3.6-13.0GHz; When incidence angle is 45 °, the absorption frequency range of below its-10dB is: 3.4-16..0GHz; When incidence angle is 65 °, its-10dB absorbs frequency range and is: 2.8-18.0GHz; When incidence angle is 75 °, the absorption frequency range of below its-10dB is: 3.2-18.0G.
In sum, for the TM polarized wave of oblique incidence, when incidence angle is equal with tilting resistor disc angle, namely incidence angle is 65 °, and the Absorber Bandwidth of this suction ripple Meta Materials below-10dB reaches maximum.Incidence angle is within the scope of 0-65 °, and the Absorber Bandwidth of below-10dB increases along with the increase of incident angle; And incidence angle more than 65 ° time, the Absorber Bandwidth of this suction ripple Meta Materials below-10dB starts sharply to reduce.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (6)
1. the ultralight absorbing material in new structure broadband, it is characterized in that, comprise metal base plate, the periodic array of the square resistor disc formation of three-dimensional rotation support and upper surface, described three-dimensional rotation supporting structure is made up of the square-shaped planar resistor disc be connected and four diamond-shaped plan resistor discs, four diamond-shaped plan resistor discs are connected with foursquare planar resistor sheet four edges respectively, and turn down certain angle a along the edge of square-shaped planar resistor disc to square center respectively, described square-shaped planar resistor disc is all identical with the length of side of diamond-shaped plan resistor disc, described square-shaped planar resistor disc, diamond-shaped plan resistor disc and square resistor disc process by resistive film.
2. the ultralight absorbing material in new structure broadband according to claim 1, it is characterized in that, described resistive film to be printed on dielectric film by screen printing technique by conductive carbon paste and to be prepared from, and the thickness of described resistive film is 10 ~ 15um, and sheet resistance value is 140 Ω/sq; Dielectric film is PET film, and thickness requirement is within 0.1mm, and relative dielectric constant real part is 3.8, and imaginary part is 0.018.
3. the ultralight absorbing material in new structure broadband according to claim 1, is characterized in that, described four rhombus resistor discs along adjacent 90 ° direction respectively with upper surface resistor disc in the slant setting of (180-a) angle.
4. the ultralight absorbing material in new structure broadband according to claim 1, is characterized in that, gained four rhombus resistor discs along adjacent 90 ° direction respectively with metal backing in the slant setting of (180-a) angle.
5. the ultralight absorbing material in new structure broadband according to claim 1, it is characterized in that, the square resistor disc of described upper surface is that the resistor-type of square structure selects layer frequently, the size of each unit is identical with the cell size of three-dimensional rotation support below, and requires that the central shaft of upper and lower two unit overlaps completely during combination.
6. the method for designing of the ultralight absorbing material in new structure broadband, is characterized in that, comprise the steps:
S1, get a square-shaped planar resistor disc and four rhombus resistor discs, four rhombuses are connected with foursquare four edges respectively, four rhombuses are turned down certain angle along foursquare edge to square center respectively, is then inverted and is put on metallic plate, obtain three-dimensional rotation support;
S2, by three-dimensional rotation supporting structure according to certain cell size do on a metal plate the cycle arrangement, obtain and there is certain thickness three-dimensional structure metamaterial wave-absorber;
S3, enclose the resistor-type frequency-selective surfaces of one deck periodic unit on whole wave-absorber surface, frequently after selecting each unit center of layer to align with each unit center of three-dimensional rotation support the resistance on upper strata, be bonded together, the suction ripple Meta Materials improving the large incidence angle absorbent properties of TM ripple must be had.
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Cited By (6)
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| CN107799903A (en) * | 2017-10-12 | 2018-03-13 | 杭州电子科技大学 | Three-dimensional novel belt inhales molded breadth band frequency selecting structures |
| CN109862769A (en) * | 2019-01-28 | 2019-06-07 | 深圳市佳晨科技有限公司 | A kind of absorbing material and preparation method thereof of ultra-thin ultra-wide spectrum |
| CN110556632A (en) * | 2019-08-16 | 2019-12-10 | 华中科技大学 | flexible resistive film-metal composite frequency selective surface, preparation and application thereof |
| CN112332108A (en) * | 2020-09-30 | 2021-02-05 | 合肥工业大学 | Metamaterial wave absorber |
| CN113972499A (en) * | 2021-10-27 | 2022-01-25 | 中国人民解放军空军工程大学 | Three-dimensional reconfigurable wide-bandwidth angular-domain wave-absorbing material based on three-pump origami |
| CN115084869A (en) * | 2022-06-24 | 2022-09-20 | 中国人民解放军空军工程大学 | Ultra-wide band wide-angle domain stealth structure material |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107799903A (en) * | 2017-10-12 | 2018-03-13 | 杭州电子科技大学 | Three-dimensional novel belt inhales molded breadth band frequency selecting structures |
| CN107799903B (en) * | 2017-10-12 | 2022-08-26 | 杭州电子科技大学 | Three-dimensional novel broadband frequency selection structure with suction |
| CN109862769A (en) * | 2019-01-28 | 2019-06-07 | 深圳市佳晨科技有限公司 | A kind of absorbing material and preparation method thereof of ultra-thin ultra-wide spectrum |
| CN109862769B (en) * | 2019-01-28 | 2021-03-26 | 深圳市佳晨科技有限公司 | Ultra-thin and ultra-wide spectrum wave-absorbing material and preparation method thereof |
| CN110556632A (en) * | 2019-08-16 | 2019-12-10 | 华中科技大学 | flexible resistive film-metal composite frequency selective surface, preparation and application thereof |
| CN110556632B (en) * | 2019-08-16 | 2021-01-19 | 华中科技大学 | Flexible resistive film-metal composite frequency selective surface, preparation and application thereof |
| CN112332108A (en) * | 2020-09-30 | 2021-02-05 | 合肥工业大学 | Metamaterial wave absorber |
| CN113972499A (en) * | 2021-10-27 | 2022-01-25 | 中国人民解放军空军工程大学 | Three-dimensional reconfigurable wide-bandwidth angular-domain wave-absorbing material based on three-pump origami |
| CN115084869A (en) * | 2022-06-24 | 2022-09-20 | 中国人民解放军空军工程大学 | Ultra-wide band wide-angle domain stealth structure material |
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Application publication date: 20160113 |