CN101840735A - Meta-material microwave absorber based on dendritic structure - Google Patents
Meta-material microwave absorber based on dendritic structure Download PDFInfo
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- CN101840735A CN101840735A CN200910021581A CN200910021581A CN101840735A CN 101840735 A CN101840735 A CN 101840735A CN 200910021581 A CN200910021581 A CN 200910021581A CN 200910021581 A CN200910021581 A CN 200910021581A CN 101840735 A CN101840735 A CN 101840735A
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Abstract
The invention relates to broad band a meta-material microwave absorber based on a dendritic structure. The meta-material microwave absorber adopts an interlayer structure and is formed by hexagonally and densely arranged metal dendritic array units, a double-layer medium substrate and a metal film. The geometric parameters, the hexagonal side length and the lattice period of the metal dendritic array units are reasonably designed to generate electromagnetic resonance. Since the interlayer structure is adopted and certain electromagnetic coupling effect exists between layers, microwave perpendicularly striking the surface of meta-material can be highly absorbed. The meta-material microwave absorber has the advantages of high absorption efficiency, simple structure, small volume, two-dimensional isotropy, wide absorption bandwidth and the like, can be used as a high-efficiency electromagnetic heating device and can also be used in electromagnetic wave collection and detection devices such as a bolometer.
Description
Technical field the present invention relates to a kind of based on the super material wide-band microwave of dendritic structure absorber.Particularly relate to a kind of based on the hexagon of dendritic structure densely arranged double-deck meta-material absorber, thereby on the basis that does not reduce absorptivity, increase bandwidth.
The super material of background technology (Metamaterial) is a kind of novel artificial structured material, can realize a series of such as unusual electromagnetic propertys such as negative refraction, perfect lens.Because the person's character of resonance, super material can produce strong local resonance under the electromagnetic field effect of characteristic frequency, induce very strong surface current, and sharply increase in subrange electric field intensity.Therefore, super material all has bigger metal ohmic loss and dielectric loss near resonance frequency.Research before generally all attempts to reduce the loss of super material as far as possible, embodies its negative magnetoconductivity or negative index characteristic better.But the loss in the super material also has a lot of potential application.Reasonably the geometric configuration and the structural parameters of designing material can be guaranteed neither to reflect also not transmission for the electromagnetic wave that incides super material surface, reach the scientific and standard that electromagnetic wave absorbs fully.Advantages such as this meta-material absorber has the absorption efficiency height, and is simple in structure, and volume is little can be used as electromagnetic heater efficiently, also can be applied to electromagnetic collection and sniffer, as the bolometric measurement instrument.
Summary of the invention the objective of the invention is to design a kind of super material wide-band microwave absorber based on dendritic structure.Should adopt sandwich construction by super material wide-band microwave absorber: top layer and middle layer at double-deck epoxy glass fabric medium substrate etch the densely arranged dendritic structure cell array of hexagon, and at plated underlayer layer of metal copper film.When electromagnetic wave impinges perpendicularly on super material surface, metal branch array can produce electric resonance to electric field induction, simultaneously, metal branch and metallic film can induce the antiparallel electric current under the action of a magnetic field, produce magnetic resonance, again since the different structure unit between and the layer all have certain electromagnetic coupled effect with interlayer, thereby by reasonably designing the structural parameters of super material, can make electric resonance and magnetic resonance in given frequency overlap, absorb the electric field and the magnetic field energy of incident electromagnetic wave respectively, thereby, realize high-absorbility broadband meta-material absorber at X-band.
Description of drawings
The invention X-band broadband meta-material absorber basic structural unit figure of Fig. 1 institute: (a) individual layer basic structural unit figure (front), (b) individual layer basic structural unit figure (back side), (c) double-deck basic structural unit figure.
The structural representation of Fig. 2 institute invention X-band broadband meta-material absorber.
Reflection amplitude (the S of the invention X-band broadband meta-material absorber BZ-1 of Fig. 3 institute
11) and absorb (Absorption) curve.
Reflection amplitude (the S of the invention X-band broadband meta-material absorber BZ-2 of Fig. 4 institute
11) and absorb (Absorption) curve.
Reflection amplitude (the S of the invention X-band broadband meta-material absorber BZ-3 of Fig. 5 institute
11) and absorb (Absorption) curve.
Embodiment adopts the circuit board lithographic technique, be on the top layer of epoxy novolac glass fibre PCB substrate of 0.8mm and the middle layer in two layers of thickness respectively and etch the densely arranged metal branch array element of hexagon, and at plated underlayer layer of metal film, adopt circuit board to roll the technology of closing then, two-ply is closely rolled altogether, as shown in Figure 2.Three grades of branch's length of metal branch are respectively a, b, c, live width w=0.3mm, and angle theta=45 °, hexagonal side length is r (Fig. 1-c).Zinc-plated processing has been done to slow down oxidation in the surface of metal branch and metallic film, and the metal coating thickness after the processing all is about 0.03mm.Optimize definite structural parameters repeatedly by Germany commercial Electromagnetic Simulation software CST Microwave Studio.By changing three grades of the length a of branch, b, c and hexagonal side length r of metal branch, obtain working in the broadband meta-material absorber of X-band.
Implementation procedure of the present invention and material property are by embodiment and description of drawings:
Embodiment one:
Adopt the circuit board lithographic technique, be on the top layer of epoxy novolac glass fibre PCB substrate of 0.8mm and the middle layer in two layers of thickness respectively and etch the densely arranged metal branch array element of hexagon, and at plated underlayer layer of metal film.Experimental design three kinds of branch shape structural units, three grades of branch's length are respectively a1=1.2mm, b1=0.7mm, c1=0.5mm; A2=1.1mm, b2=0.7mm, c2=0.5mm; A3=1.1mm, b3=0.7mm, c3=0.6mm, live width w=0.3mm; The thickness of branch and metallic film is 0.03mm, adopts hexagon to arrange between the unit, and the length of side is r=4.0mm.Pcb board after the etching is cut into size for 156mm * 146mm, finishes the making of designed meta-material absorber BZ-1.The reflection of meta-material absorber BZ-1 and the normalized curve of absorption are as shown in Figure 3.Since between three kinds of structural units and layer with layer between have electromagnetic coupled, as can be seen from the figure, reflectivity curve from 9.778GHz to 10.966GHz near, reflectivity has appearred less than 10% than broad absorption band, transmission curve is constantly equal to 0.Then absorptivity is 1.398GHz greater than 90% bandwidth.And the absorptivity from 10.438GHz to 10.966GHz has reached 99% and has realized perfect absorption.
Embodiment two:
Shown in example one, adopt the circuit board lithographic technique, adopting the circuit board lithographic technique, is to etch the densely arranged metal branch array element of hexagon on the top layer of epoxy novolac glass fibre PCB substrate of 0.8mm and the middle layer in two layers of thickness respectively, and at plated underlayer layer of metal film.Experimental design three kinds of branch shape structural units, three grades of branch's length are respectively a1=1.2mm, b1=0.7mm, c1=0.5mm; A2=1.1mm, b2=0.7mm, c2=0.5mm; A3=1.2mm, b3=0.8mm, c3=0.5mm, live width w=0.3mm; The thickness of branch and metallic film is 0.03mm, adopts hexagon to arrange between the unit, and the length of side is r=4.6mm.Pcb board after the etching is cut into size for 156mm * 146mm, finishes the making of designed meta-material absorber BZ-2.The reflection of meta-material absorber BZ-2 and the normalized curve of absorption are as shown in Figure 3.Since between three kinds of structural units and layer with layer between have electromagnetic coupled, as can be seen from the figure, reflectivity curve from 10.07GHz to 11.76GHz near, reflectivity has appearred less than 20% than broad absorption band, transmission curve is constantly equal to 0.Then absorptivity is 1.69GHz greater than 80% bandwidth.
Embodiment three:
Shown in example one, adopt the circuit board lithographic technique, be to etch the densely arranged metal branch array element of hexagon on the top layer of epoxy novolac glass fibre PCB substrate of 0.8mm and the middle layer in two layers of thickness respectively, and at plated underlayer layer of metal film.Experimental design three kinds of branch shape structural units, three grades of branch's length are respectively a1=1.2mm, b1=0.7mm, c1=0.6mm; A2=1.3mm, b2=0.7mm, c2=0.6mm; A3=1.1mm, b3=0.7mm, c3=0.6mm, live width w=0.3mm; The thickness of branch and metallic film is 0.02mm, adopts hexagon to arrange between the unit, and the length of side is r=4.6mm.Pcb board after the etching is cut into size for 180mm * 178mm, finishes the making of designed meta-material absorber BZ-3.The reflection of meta-material absorber BZ-3 and the normalized curve of absorption are as shown in Figure 5.Since between three kinds of structural units and layer with layer between have electromagnetic coupled, as can be seen from the figure, reflectivity curve from 9.16GHz to 11.35GHz near, reflectivity has appearred less than 10% than broad absorption band, transmission curve is constantly equal to 0.Then absorptivity is 2.19GHz greater than 90% bandwidth.
In sum, the super material wide-band microwave of the densely arranged bilayer of the hexagon based on the dendritic structure absorber that designs by means of resonance principle among the present invention, impinge perpendicularly on the branch plane for the electromagnetic wave of characteristic frequency and neither reflect also not transmission, shown fine, very wide absorptive character at X-band.The above only is the preferred embodiments of the present invention, when not limiting scope of the invention process with this, promptly the simple equivalent of being done according to claim of the present invention and description of the invention content generally changes and modifies, and all should still belong in the scope of patent covering of the present invention.
Claims (4)
1. super material wide-band microwave absorber based on dendritic structure, composition comprises: metal branch array, medium substrate and metallic film, its principal character is to adopt sandwich construction, and changes the physical dimension and the hexagonal side length of metal branch, makes it wide absorption band occur at X-band.
2. the described a kind of super material wide-band microwave absorber of claim 1 based on dendritic structure, it is characterized in that adopting sandwich construction, this structure is to etch the densely arranged dendritic structure cell array of hexagon at the top layer of two-layer epoxy glass fabric medium substrate and middle layer, again at plated underlayer layer of metal copper film, and adopt circuit board to roll the technology of closing two-ply is closely rolled altogether.
3. the described a kind of super material wide-band microwave absorber of claim 1 based on dendritic structure, the metal branch of three kinds of different sizes that it is characterized in that institute's etching is densely arranged by hexagon, hexagonal side length is r=4～4.6mm, live width is w=0.3mm, and the thickness of medium substrate is h=0.8mm.
4. the described a kind of super material wide-band microwave absorber of claim 1 based on dendritic structure, the geometric parameter that it is characterized in that three kinds of different branches of institute's etching, therefrom branch length at different levels are one-level branch length a=1.1～1.3mm around the mind-set, secondary branch length b=0.7～0.8mm, three grades of length c=0.5～0.6mm of branch, angle is θ=45 ° between branch.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102769210A (en) * | 2012-06-29 | 2012-11-07 | 深圳光启创新技术有限公司 | Wideband wave-absorbing material |
| CN102800991A (en) * | 2012-08-03 | 2012-11-28 | 深圳光启创新技术有限公司 | Wideband absorbing meta-material |
| CN102810743A (en) * | 2011-06-29 | 2012-12-05 | 深圳光启高等理工研究院 | Device for attenuating creeping wave on antenna surface |
| CN102856663A (en) * | 2012-08-24 | 2013-01-02 | 电子科技大学 | Metamaterial, broadband and infrared wave-absorbing structural material |
| CN103000999A (en) * | 2011-09-16 | 2013-03-27 | 深圳光启高等理工研究院 | Metamaterial |
| CN103032906A (en) * | 2011-06-17 | 2013-04-10 | 深圳光启高等理工研究院 | Microwave oven |
| CN103094708A (en) * | 2011-10-31 | 2013-05-08 | 深圳光启高等理工研究院 | Wave-absorbing metamaterial |
| CN105097052A (en) * | 2014-05-22 | 2015-11-25 | 西北工业大学 | Surface resistive type broadband meta-material absorber |
| US9837725B2 (en) | 2012-07-31 | 2017-12-05 | Kuang-Chi Innovative Technology Ltd. | Wide-frequency wave-absorbing metamaterial, electronic device and method for obtaining wide-frequency wave-absorbing metamaterial |
| CN108333654A (en) * | 2018-03-05 | 2018-07-27 | 江西师范大学 | A kind of titanium material electromagnetic wave perfection absorber |
| CN110031925A (en) * | 2019-04-30 | 2019-07-19 | 深圳大学 | Absorber and preparation method thereof |
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2009
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103032906A (en) * | 2011-06-17 | 2013-04-10 | 深圳光启高等理工研究院 | Microwave oven |
| CN103032906B (en) * | 2011-06-17 | 2016-05-11 | 深圳光启高等理工研究院 | A kind of micro-wave oven |
| CN102810743B (en) * | 2011-06-29 | 2015-03-11 | 深圳光启高等理工研究院 | Device for attenuating creeping wave on antenna surface |
| CN102810743A (en) * | 2011-06-29 | 2012-12-05 | 深圳光启高等理工研究院 | Device for attenuating creeping wave on antenna surface |
| CN103000999B (en) * | 2011-09-16 | 2015-06-17 | 深圳光启高等理工研究院 | Metamaterial |
| CN103000999A (en) * | 2011-09-16 | 2013-03-27 | 深圳光启高等理工研究院 | Metamaterial |
| CN103094708A (en) * | 2011-10-31 | 2013-05-08 | 深圳光启高等理工研究院 | Wave-absorbing metamaterial |
| CN102769210B (en) * | 2012-06-29 | 2014-12-24 | 深圳光启创新技术有限公司 | Wideband wave-absorbing material |
| CN102769210A (en) * | 2012-06-29 | 2012-11-07 | 深圳光启创新技术有限公司 | Wideband wave-absorbing material |
| US9837725B2 (en) | 2012-07-31 | 2017-12-05 | Kuang-Chi Innovative Technology Ltd. | Wide-frequency wave-absorbing metamaterial, electronic device and method for obtaining wide-frequency wave-absorbing metamaterial |
| CN102800991B (en) * | 2012-08-03 | 2015-03-11 | 深圳光启创新技术有限公司 | Wideband absorbing meta-material |
| CN102800991A (en) * | 2012-08-03 | 2012-11-28 | 深圳光启创新技术有限公司 | Wideband absorbing meta-material |
| CN102856663A (en) * | 2012-08-24 | 2013-01-02 | 电子科技大学 | Metamaterial, broadband and infrared wave-absorbing structural material |
| CN105097052A (en) * | 2014-05-22 | 2015-11-25 | 西北工业大学 | Surface resistive type broadband meta-material absorber |
| CN108333654A (en) * | 2018-03-05 | 2018-07-27 | 江西师范大学 | A kind of titanium material electromagnetic wave perfection absorber |
| CN110031925A (en) * | 2019-04-30 | 2019-07-19 | 深圳大学 | Absorber and preparation method thereof |
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Application publication date: 20100922 |