CN103269574B - A kind of ultrathin wideband inhales ripple Meta Materials - Google Patents
A kind of ultrathin wideband inhales ripple Meta Materials Download PDFInfo
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- CN103269574B CN103269574B CN201310143557.6A CN201310143557A CN103269574B CN 103269574 B CN103269574 B CN 103269574B CN 201310143557 A CN201310143557 A CN 201310143557A CN 103269574 B CN103269574 B CN 103269574B
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Abstract
A kind of ultrathin wideband of the present invention inhales ripple Meta Materials, comprise at least two layer medium plate stacked together, in described dielectric-slab stacked together, the upper surface being positioned at the dielectric-slab of top layer is coated with one deck matching layer, the lower surface being positioned at the dielectric-slab of bottom is coated with layer of metal floor, the upper surface of each layer dielectric-slab also comprises one deck non-closed annular metal level, the described non-closed annular metal level be positioned on different medium plate is of similar shape and mutually different size, and divide arrangement by pyramid structure, the non-closed annular metal level that wherein size is maximum is positioned on underlying dielectric plate.Suction ripple Meta Materials of the present invention by changing the electromagnetic parameter of every Rotating fields thus changing reflection and the phase place of refracted wave, last reflected wave and incident wave are disappeared mutually thus reach electromagnetic wave absorb by Meta Materials the same effect.Have employed three dielectric-slabs, the metamaterial structure of three beckets and one piece of metal floor composition, achieves the ultrathin of broadband absorbing material.
Description
Technical field
The present invention relates to Meta Materials microwave absorption technique field, be specifically related to a kind of ultrathin wideband and inhale ripple Meta Materials.
Background technology
Absorbing material refers to electromagnetic most of energy that can be absorbed into and be mapped on its surface, and is the class material that the energy and almost not occurring of other form reflects by these Conversion of Energies.Along with the extensive use of absorbing material in stealth technology, heat preservation energy-saving and physical protection etc., its development is faced with many challenges newly simultaneously, is included in the ultrathin on prior art basis and a broadband difficult problem.Be different from conventional material, the physical attribute of Meta Materials is not the chemical composition depending primarily on its inside, but depending on the concrete metamaterial structure of its inside, the atom of the function similar nature conventional material of these man-made structures and molecule, namely have the feature being different from the function of its material own.Current electromagnetism Meta Materials is be made up of sub-wavelength array mostly, and it can describe its electromagnetic property with dielectric constant and magnetic permeability.By regulating the interaction of electromagnetic wave and sub-wavelength array, they can produce unusual physical characteristic, and these characteristics are that nature material and chemical synthetic material are unexistent, therefore this type of material is called Meta Materials.
Based on the absorbing material of metamaterial structure as a kind of novel wave-absorbing material, frequency range as required can carry out the design of different size, flexibility is comparatively strong, but Absorber Bandwidth is general all narrower, does not reach the application requirement needed for broadband.
In order to the suction wavestrip expanding Meta Materials is wide, two kinds of novel methods are developed recent years: wherein a kind of method integrates lamped element in Meta Materials at microwave frequency band.Adding of lamped element, the bandwidth of this structure metamaterial more than 90% absorptivity is made to reach 1.5GHz.Another kind method piles up sandwich construction on same substrate, and the principle of electromagnetic wave absorption is that resonant mode absorbs.Under the excitation of certain frequency electromagnetic, then the electromagnetic field resonance of certain part of absorbing material partially absorbed a less frequency by this, and along with the increase of frequency, the position that resonance occurs is moved gradually.Under such mode of resonance, electromagnetic resonance all exists.Although this sandwich construction Absorber Bandwidth is very wide, its Absorber Bandwidth is almost be proportional to absorbing material thickness, can not meet the requirement of absorbing material ultrathin.With kind of the Measures compare of two above, when Meta Materials area equation, the Absorber Bandwidth of this technology is relatively wide.Although the increase electric capacity of lump and the method for resistance are methods that is novel and that be suitable for, the method is used to be unfavorable for actual production manufacture.For Terahertz, infrared and light wave frequency range, the structure of inhaling ripple Meta Materials is more and more less, and this lamped element that adds is not suitable for more to the method expanding bandwidth.
Summary of the invention
The present invention is directed to existing absorbing material the thickness of material own and inhale wavestrip wide etc. in deficiency, propose a kind of ultrathin wideband based on metamaterial structure and inhale ripple Meta Materials.
Technical scheme of the present invention is: a kind of ultrathin wideband inhales ripple Meta Materials, it is characterized in that, comprise at least two layer medium plate stacked together, in described dielectric-slab stacked together, the upper surface being positioned at the dielectric-slab of top layer is coated with one deck matching layer, the lower surface being positioned at the dielectric-slab of bottom is coated with layer of metal floor, the upper surface of each layer dielectric-slab also comprises one deck non-closed annular metal level, the described non-closed annular metal level be positioned on different medium plate is of similar shape and mutually different size, and divide arrangement by pyramid structure, the non-closed annular metal level that wherein size is maximum is positioned on underlying dielectric plate.
Further, described non-closed annular metal level shape is square loop, a pair pair of angle point comprises two openings wherein, and the aperture position of the non-closed annular metal level on adjacent media plate lays respectively at different from angle point.
Further, described suction ripple Meta Materials comprises three layers of dielectric-slab.
Beneficial effect of the present invention is, inhale ripple Meta Materials by changing the electromagnetic parameter (dielectric constant and magnetic permeability) of every Rotating fields thus changing the phase place of reflection and refracted wave, last reflected wave and incident wave are disappeared mutually thus reach electromagnetic wave absorb by Meta Materials the same effect.The change of every layer of electromagnetic parameter is regulated by the size of wherein metal structure ring.Have employed three dielectric-slabs, the metamaterial structure of three beckets and one piece of metal floor composition, and a Block-matching layer.Achieve the ultrathin of broadband absorbing material.
Accompanying drawing explanation
The stereochemical structure perspective view of Fig. 1 specific embodiments of the invention;
Fig. 2 is the cutaway view of absorbing material embodiment illustrated in fig. 1;
Fig. 3 be absorbing material embodiment illustrated in fig. 1 overlook direction perspective view;
Fig. 4 is that absorbing material embodiment illustrated in fig. 1 is to the electromagnetic absorption graph of a relation of different frequency.
Embodiment
Inhale ripple Meta Materials below in conjunction with a kind of ultrathin wideband of accompanying drawing to specific embodiments of the invention to be described in further detail.
As Fig. 1, shown in Fig. 2 and Fig. 3, a kind of ultrathin wideband of the present embodiment inhales ripple Meta Materials, comprise at least two layer medium plate stacked together, number in the figure is F1, F2 and F3, in described dielectric-slab stacked together, the upper surface being positioned at the dielectric-slab F1 of top layer is coated with one deck matching layer F0, the lower surface being positioned at the dielectric-slab F3 of bottom is coated with layer of metal floor F4, the upper surface of each layer dielectric-slab also comprises one deck non-closed annular metal level, number in the figure is S1, S2 and S3, the described non-closed annular metal level (S1 be positioned on different medium plate, S2 and S3) be of similar shape and mutually different size, and divide arrangement by pyramid structure, the non-closed annular metal level that wherein size is maximum is positioned on underlying dielectric plate.In the description of the present embodiment; relate to inferior orientation concept; it should be noted that these described orientation concepts relatively exist; namely define its opposite face when a certain surface is upper to be down; do not represent the upper and lower of practical significance, should not form the restriction to the claimed technical scheme of invention yet.In addition, by pyramid structure distribution, described refers to that the non-closed annular metal level that size is different stacks according to order from big to small or from small to large, and the plane orthogonal at the line of the central point of each non-closed annular metal level and described non-closed annular metal level place.
Described non-closed annular metal level shape is preferably square loop, also can be other shapes such as rectangle, a pair pair of angle point comprises two openings wherein, the aperture position of the non-closed annular metal level on adjacent media plate lays respectively at different from angle point, and the becket (non-closed annular metal level) namely on adjacent two layers dielectric-slab is opened on complementary on angle point.If for square ABCD, adjacent metal ring is opened on AC and BD respectively.
In the prior art, a kind of technical scheme the most close with the absorbing material structure of this structure is as follows, comprise the not identical a large amount of beckets on multilayer acoustical panel and each layer dielectric-slab, same manyly can must enter absorbing material in order to electromagnetic wave, the upper surface of the material enough become at multilayer acoustical panel is coated with one deck matching layer, for mating with air, lower surface is also provided with metal floor, its object is to will have passed through each layer dielectric-slab and unabsorbed electromagnetic wave is reflected into dielectric layer again, to carry out double absorption by the becket on dielectric-slab.In this technology, electromagnetic principle of absorption is the electromagnetic resonance effect that each becket that dielectric-slab is arranged all has to a certain specific wavelength, the electromagnetic wave meeting condition of resonance can be absorbed through this becket, the suction wavestrip that can be expanded material by the different metal ring that stacking multiple frequency is corresponding is wide, and the electromagnetic absorptivity of this wave band can be improved by the density of the becket strengthening same size, therefore adopt the absorbing material of this scheme in order to reach higher absorptivity and larger bandwidth range, usually need to arrange plurality of layers dielectric-slab.Manufactured absorbing material thickness is thicker.And exist and improve the deficiency that absorptivity can reduce bandwidth.
Though the suction ripple Meta Materials of the present embodiment structurally has similarity with above-mentioned prior art, while reservation distinguishing characteristics, bring unexpected effect.Make a concrete analysis of as follows: something in common is adopt multilayer dielectricity plate structure and have employed top matching layer and bottom metal floor, because the functions and principles of the matching layer that adopts in the effect in the present embodiment of matching layer and metal floor and prior art and metal floor there is no too big-difference, therefore be not described further in the present embodiment.The difference of the present embodiment is, dielectric layer between bottom metal floor and top matching layer and the non-closed annular metal level on dielectric layer directly maintain the whole relation of constraint mutually, namely adopt the mutually different becket of size and press pyramid structure arrangement, and described becket is different from becket of the prior art, its object does not lie in and absorbs incident electromagnetic wave by resonance effect, therefore the starting point of its design does not lie in the electromagnetic wave resonance with a certain wavelength.The suction ripple principle of this version of the present embodiment be the becket at top absorb a part of incident electromagnetic wave while also transmission part electromagnetic wave, absorbed respectively at next non-closed annular metal level, reflected and transmission after the electromagnetic wave of transmission enters next dielectric layer, the electromagnetic wave be launched back interferes with the electromagnetic wave of incidence the effect being formed and interfere and disappear mutually again mutually, interfere through the absorption of the non-closed annular metal level of multilayer acoustical panel disappear mutually with reflection, the electromagnetic most of energy absorption compared with large bandwidth scope can be fallen.
Fig. 4 is the software emulation result of the present embodiment, wherein top matching layer adopts polytetrafluoroethylene, certainly can be taconic or the material of other dielectric constant between 2.1-2.3, thickness is preferably the 0.05-0.06 of center frequency wavelength doubly, wherein, centre frequency here refers to the centre frequency of the electromagnetic wave absorption that absorbing material is corresponding.Centre is three layers of dielectric-slab structure, and material adopts RogerTMM4, can be ceramic material or FR-4 material certainly.Wherein RogerTMM4 ceramic material and FR-4 material are the material in simulation software material depot, the material be well known for ordinary skill in the art, and do not launch here to describe.In addition, the thickness of first medium plate is preferably the 0.03-0.04 of center frequency wavelength doubly, and the thickness of second medium plate is preferably the 0.04-0.05 of center frequency wavelength doubly, and the thickness of the 3rd dielectric-slab is preferably the 0.03-0.04 of center frequency wavelength doubly.Be etched in the becket S1(non-closed annular metal level of three pieces of dielectric-slab upper surfaces) and metal floor F4 employing copper, can be the electric conducting material such as silver or aluminium certainly.The length of side of becket S1 is preferably the 0.06-0.01 of center frequency wavelength doubly, and the length of side of becket S2 is preferably the 0.15-0.2 of center frequency wavelength doubly, and the length of side of becket S3 is preferably the 0.22-0.3 of center frequency wavelength doubly.Absorptivity is defined as A=1-T-R=1-|S
11|-| S
21|, in formula, T is normalization projection ripple, and R is normalization reflected wave.In order to make absorptivity maximize, require whole frequency range reflected waves and transmitted wave little as much as possible.Because metal floor is used for blocking and reflection electromagnetic wave, transmitted wave is zero, therefore absorptivity is A=1-R.
The gross thickness of suction ripple Meta Materials 4 Rotating fields (three layers of dielectric layer and one deck matching layer) of the present embodiment is only the 0.10-0.26 of space free wavelength doubly.And as can be seen from Figure 4 this suction ripple Meta Materials can reach the absorptivity of 90% at 8.37-21GHz.The bandwidth of more than 90 absorptivities reaches 12.63GHz.Compared with the absorbing material of existing about 1.5GHz bandwidth, there is significant progress.
The scheme that the present embodiment provides also by changing the thickness of dielectric-slab and the size of rectangular metal ring further to regulate the absorption frequency range of inhaling ripple Meta Materials, makes it meet the demand to microwave absorbing property of special frequency channel.
Those of ordinary skill in the art will appreciate that, embodiment described here is to help reader understanding's implementation method of the present invention, should be understood to that protection scope of the present invention is not limited to so special statement and embodiment.Those of ordinary skill in the art can make various other various concrete distortion and combination of not departing from essence of the present invention according to these technology enlightenment disclosed by the invention, and these distortion and combination are still in protection scope of the present invention.
Claims (9)
1. a ultrathin wideband inhales ripple Meta Materials, it is characterized in that, comprise at least two layer medium plate stacked together, in described dielectric-slab stacked together, the upper surface being positioned at the dielectric-slab of top layer is coated with one deck matching layer, the lower surface being positioned at the dielectric-slab of bottom is coated with layer of metal floor, the upper surface of each layer dielectric-slab also comprises one deck non-closed annular metal level, the described non-closed annular metal level be positioned on different medium plate is of similar shape and mutually different size, and by pyramid structure arrangement, the non-closed annular metal level that wherein size is maximum is positioned on underlying dielectric plate,
Described non-closed annular metal level shape is straight-flanked ring, a pair pair of angle point comprises two openings wherein, and the aperture position of the non-closed annular metal level on adjacent media plate lays respectively at different from angle point.
2. a kind of ultrathin wideband according to claim 1 inhales ripple Meta Materials, and it is characterized in that, described suction ripple Meta Materials comprises three layers of dielectric-slab.
3. a kind of ultrathin wideband according to claim 1 inhales ripple Meta Materials, and it is characterized in that, described matching layer material is polytetrafluoroethylene.
4. a kind of ultrathin wideband according to claim 3 inhales ripple Meta Materials, it is characterized in that, centered by the thickness of described matching layer, the 0.05-0.06 of frequency wavelength doubly.
5. a kind of ultrathin wideband according to claim 1 inhales ripple Meta Materials, and it is characterized in that, described dielectric board material is RogerTMM4, ceramic material or FR-4 material.
6. a kind of ultrathin wideband according to claim 2 inhales ripple Meta Materials, it is characterized in that, centered by the thickness of top layer dielectric-slab, the 0.03-0.04 of frequency wavelength doubly.
7. a kind of ultrathin wideband according to claim 2 inhales ripple Meta Materials, it is characterized in that, centered by the thickness of interlayer plate, the 0.04-0.05 of frequency wavelength doubly.
8. a kind of ultrathin wideband according to claim 2 inhales ripple Meta Materials, it is characterized in that, centered by the thickness of underlying dielectric plate, the 0.03-0.04 of frequency wavelength doubly.
9. a kind of ultrathin wideband according to claim 1 inhales ripple Meta Materials, and it is characterized in that, described non-closed annular metal level shape is square loop.
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| CN111600134B (en) * | 2020-06-11 | 2021-03-05 | 中国电子科技集团公司第三十三研究所 | Wave-absorbing metamaterial for encrypting computer display |
| CN113363728A (en) * | 2021-05-17 | 2021-09-07 | 海宁利伊电子科技有限公司 | Miniaturized ultra-wideband metamaterial wave absorber structure for inhibiting electromagnetic radiation and application |
| CN113437528B (en) * | 2021-07-07 | 2022-11-11 | 东莞理工学院 | Broadband wave-absorbing metamaterial with adjustable narrow-band reflection window |
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