CN108493623A - Sub-wavelength stratiform three-dimensional broadband absorbent structure based on loss-type frequency-selective surfaces - Google Patents
Sub-wavelength stratiform three-dimensional broadband absorbent structure based on loss-type frequency-selective surfaces Download PDFInfo
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- CN108493623A CN108493623A CN201810365336.6A CN201810365336A CN108493623A CN 108493623 A CN108493623 A CN 108493623A CN 201810365336 A CN201810365336 A CN 201810365336A CN 108493623 A CN108493623 A CN 108493623A
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- 230000002745 absorbent Effects 0.000 title claims abstract description 25
- 239000002250 absorbent Substances 0.000 title claims abstract description 25
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 26
- 125000004122 cyclic group Chemical group 0.000 claims abstract description 14
- 230000000737 periodic effect Effects 0.000 claims abstract description 7
- 229910052751 metal Inorganic materials 0.000 claims abstract description 6
- 239000002184 metal Substances 0.000 claims abstract description 6
- 239000004020 conductor Substances 0.000 claims abstract description 3
- 230000000694 effects Effects 0.000 claims description 12
- 229910052788 barium Inorganic materials 0.000 claims description 4
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 claims description 4
- 229920006267 polyester film Polymers 0.000 claims description 3
- 238000010521 absorption reaction Methods 0.000 abstract description 5
- 230000010287 polarization Effects 0.000 abstract description 4
- 239000010410 layer Substances 0.000 description 26
- 239000000463 material Substances 0.000 description 10
- 239000011358 absorbing material Substances 0.000 description 7
- 239000000758 substrate Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 238000007650 screen-printing Methods 0.000 description 2
- 229910005347 FeSi Inorganic materials 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
- H01Q17/008—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems with a particular shape
Landscapes
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Aerials With Secondary Devices (AREA)
Abstract
The invention discloses a kind of sub-wavelength stratiform three-dimensional broadband absorbent structure based on loss-type frequency-selective surfaces, the structure is the periodic array arrangement being made of multiple structural units, and each structural unit includes four cyclic annular frequency-selective surfaces, the dielectric layer played a supporting role, the metal backings positioned at the ferrite layer of dielectric layer lower surface and positioned at ferrite layer lower surface；Four cyclic annular frequency-selective surfaces are uniformly distributed in vertical direction in dielectric layer；Wherein, ferrite layer is less than the ferrite of 2GHz using working frequency, and cyclic annular frequency-selective surfaces use conductivity for the conductive material of 100 200S/m.The present invention is based on the sub-wavelength stratiform three-dimensional broadband absorbent structures of loss-type frequency-selective surfaces, and the broadband absorption to spatial electromagnetic wave may be implemented, while having the characteristics that, light weight insensitive to polarization of ele, simple in structure, easy processing, at low cost, working band is wide, relative thickness is thin.
Description
Technical field
The invention belongs to Electromagnetic Field and Microwave Technology fields, and in particular to a kind of Asia based on loss-type frequency-selective surfaces
Wavelength stratiform three-dimensional broadband absorbent structure.
Background technology
Absorbing material just can be achieved on the absorption to incident electromagnetic wave, achieve the effect that reduce reflection.Traditional suction wave
Material is will have consumption film to be attached to apart from 1/4 wavelength thickness of behind metal backing such as Jaumann wave-absorbers and Salisbury screens
Medium on, forming standing wave makes energy be confined in medium, has consumption film and the loss of medium to reach suction wave by surface, still
The disadvantage is that thickness is thicker.Absorbing material of today mainly realizes nature material institute not by designing artificial electromagnetic Meta Materials
The characteristic having, such as super surface is used to design absorbent structure, very thin thickness may be implemented in a certain Frequency point to electromagnetism
The perfect of wave absorbs, but a disadvantage is that it is narrow to inhale wave frequency band.
Traditional absorbing material and novel super surface absorbent structure are typically all two-dimensional structure, are limited by the limitation of its structure,
It is difficult to the requirement designed while having thin thickness, suction wave frequency bandwidth, low frequency absorbing property good；Wave material is inhaled for some three-dimensionals
Material, for example a kind of dielectric structure type stratiform absorbing material based on low-k is proposed in patent CN107302139A, have
Multiband assimilation effect, but each frequency range is the response of narrowband；Patent CN106380626A proposes a kind of broadband absorbing material
Material uses the FeSi layers of absorption that low frequency and high frequency are each responsible for carbonyl iron layer, but the assimilation effect of low frequency and bad, only-
8dB, high frequency also can only achieve the absorption of -10dB of 9-14GHz, and preparation process is complicated.
Invention content
Goal of the invention：Existing problem and shortage for the above-mentioned prior art, the object of the present invention is to provide a kind of structures
Simply, easy processing, the electromagnetic wave broadband absorbent structure that at low cost, working band is wide, relative thickness is thin, can realize vertical incidence
In the case of to spatial electromagnetic wave broadband absorb effect.
Technical solution：For achieving the above object, the technical solution adopted by the present invention is：
A kind of sub-wavelength stratiform three-dimensional broadband absorbent structure based on loss-type frequency-selective surfaces, is made of multiple structural units
Periodic array arrangement, each structural unit includes four cyclic annular frequency-selective surfaces, the dielectric layer played a supporting role, positions
In the ferrite layer of dielectric layer lower surface and metal backing positioned at ferrite layer lower surface；Described four cyclic annular frequencies select table
Face is uniformly distributed in vertical direction in dielectric layer；The ferrite layer is less than the ferrite of 2GHz using working frequency；It is described
Cyclic annular frequency-selective surfaces use conductivity for the conductive material of 100-200S/m.
Preferably, the ring-type frequency-selective surfaces are by the electrically conductive ink or the conductive film system that are printed on polyester film
At.
Preferably, the ring-type frequency-selective surfaces are regular hexagon cyclic structure frequency-selective surfaces.
Preferably, the regular hexagon ring-type frequency-selective surfaces outer diameter is 15-17mm, internal diameter 11-13mm；Structure
Elementary cell constant is 18-22mm.
Preferably, the dielectric layer uses relative dielectric constant for the cystosepiment of 1.1-1.3, it is 4.5- per layer thickness
5.5mm, four layers of overall thickness 18-22mm.
Preferably, the ferrite layer uses hexagonal lattice barium Conjugate ferrite, thickness 4.5-5.5mm.
Operation principle：Single layer ring-type loss-type frequency-selective surfaces structure can be equivalent to the resistance capacitance inductance string on circuit
It is coupled structure, i.e. RLC series circuits, dielectric layer is equivalent to one section of transmission line structure, between four layers of cyclic annular frequency-selective surfaces structure
It is parallel relationship, to be equivalent to a filter with resistance type on the whole.And lowest level by increase by one piece work in it is low
The high-k of frequency and the ferrite of high magnetic permeability, have further expanded bandwidth, increase the assimilation effect of low-frequency range, obtain
One has ultra wide band and the good absorbent structure of low frequency absorption.
Advantageous effect：It inhales in a kind of sub-wavelength stratiform three-dimensional broadband based on loss-type frequency-selective surfaces proposed by the present invention
Wave structure not only has opposite band roomy（Relative bandwidth is 200%）, while also having steady to spatial electromagnetic wave difference polarization mode
The advantages such as fixed wave-absorbing effect and thickness be thin, light weight, simple in structure, easy processing, at low cost, working band is wide.The structure
The problems such as general absorbent structure is small with respect to bandwidth of operation, thickness is thicker, and low frequency assimilation effect is poor is overcome, microwave band is realized
Broadband wave-absorbing effect.
Description of the drawings
Fig. 1 is the three-dimensional structure view of the periodic structure unit of the present invention.
Fig. 2 is the front view of the periodic structure unit of the present invention.
Fig. 3 is the vertical view of the periodic structure unit of the present invention.
Fig. 4 is the schematic three dimensional views of the present invention.
Fig. 5 is the S11 parameters simulation result figures of the present invention.
In Fig. 1,1：Cyclic annular loss-type frequency-selective surfaces, 2：Medium substrate, 3：Ferrite layer, 4：Metal backing.
Specific implementation mode
In the following with reference to the drawings and specific embodiments, the present invention is furture elucidated, it should be understood that these embodiments are merely to illustrate
It the present invention rather than limits the scope of the invention, after having read the present invention, those skilled in the art are to of the invention each
The modification of kind equivalent form falls within the application range as defined in the appended claims.
Fig. 1-Fig. 4 shows that sub-wavelength stratiform three-dimensional broadband of the embodiment of the present invention based on loss-type frequency-selective surfaces is inhaled
The schematic diagram of wave structure.In the present embodiment, the periodic array arrangement that broadband absorbent structure is made of multiple structural units,
In each structural unit, as shown in Figure 1, 2, including four cyclic annular loss-type frequency-selective surfaces 1, be used to support each frequency choosing
Select surface 1 medium substrate 2 and positioned at last layer of 2 lower surface of medium substrate ferrite layer 3 and be located at 3 following table of ferrite layer
The metal backing 4 in face.Four cyclic annular loss-type frequency-selective surfaces 1 are evenly arranged in the vertical direction, and every layer of frequency selects table
1 consistency from top to bottom of face.Fig. 4 shows that wave knot is inhaled in sub-wavelength stratiform three-dimensional broadband of the present embodiment based on loss-type frequency-selective surfaces
Structure multiple said units structures period on planar direction rearranges, using triangular crystal lattice continuation.
Electrically conductive ink or ITO etc. may be used in cyclic annular loss-type frequency-selective surfaces in the broadband absorbent structure of the present invention
The material of conductivity 100-200S/m is made, and regular quadrangle, regular hexagon etc. can be used in shape.Ferrite layer is low using working in
Frequently（Resonant frequency is less than 2GHz）High-k and high magnetic permeability ferrite, such as hexagonal lattice barium Conjugate ferrite.This reality
The electrically conductive ink ring that a frequency-selective surfaces use regular hexagon is applied, regular hexagon structure can be reinforced between adjacent cells
Its wave-absorbing effect is widened in coupling, and electrically conductive ink is printed on using screen printing technique on polyester film, has at low cost, side
Just the advantage mass produced, ferrite layer are made of hexagonal lattice barium Conjugate ferrite.
In design, according to the working band requirement to absorbent structure, the unit size size and thickness of the structure are determined
Degree, the dimensional parameters and conductivity of loss-type frequency-selective surfaces.The usual structural unit can be preferentially in the following size range
It chooses and is adjusted to optimal size according to emulation or measured result：Every layer of thickness of dielectric layers 4.5-5.5mm, four layers of overall thickness 18-
22mm；Ferrite layer thickness is 4.5-5.5mm；Regular hexagon ring outer diameter is 15-17mm, internal diameter 11-13mm；Structural unit is brilliant
Lattice constant is 18-22mm.In the present embodiment, the dielectric board material of medium substrate 2 uses cystosepiment, relative dielectric constant 1.2,
Every layer of media plate thickness are 5mm, and loss-type frequency-selective surfaces use conductivity for the electrically conductive ink of 160S/m, and cellular construction is excellent
Parameter is after change：Elementary cell constant be p=20mm, regular hexagon loss-type frequency-selective surfaces outer diameter R=16mm, internal diameter r=
12mm。
The absorbing property of absorbing material is usually indicated with the size S11 of its reflectance factor.Fig. 5 be respectively for TE polarization and
S11 curve graphs when TM polarization vertical incidence.We are using 90% or more absorptivity as standard, i.e. reflectance factor S11 is in -10dB
Below, it can be seen that -10dB the relative bandwidths of the absorbent structure are up to 200%（0.5GHz-25GHz）.It should be based on loss-type frequency
The sub-wavelength stratiform three-dimensional broadband absorbent structure on selection surface shows the microwave absorbing property of good polarizer stability and ultra wide band.
The sub-wavelength stratiform three-dimensional broadband absorbent structure based on loss-type frequency-selective surfaces that the present embodiment proposes inhales wave
Bandwidth is especially wide, is completely superior to existing absorbing material；And thickness is thin, which only has 25mm, compared to same
The suction wave angle of effect is bored, thickness only have its 1/20 or so, if its relative thickness only has compared with the wavelength of lowest operating frequency
1/24, belong to depth sub-wavelength structure；And it prepares simply, may be implemented to make on a large scale using ripe screen printing technique
It is standby；And at low cost, material therefor is all some cheap common materials.In conclusion should be selected based on loss-type frequency
The sub-wavelength stratiform three-dimensional broadband absorbent structure for selecting surface is a kind of absorbent structure of great application prospect.
Claims (6)
1. a kind of sub-wavelength stratiform three-dimensional broadband absorbent structure based on loss-type frequency-selective surfaces, which is characterized in that by more
The periodic array arrangement that a structural unit is constituted, each structural unit include four cyclic annular frequency-selective surfaces, play support
The dielectric layer of effect, the metal backing positioned at the ferrite layer of dielectric layer lower surface and positioned at ferrite layer lower surface；Described four
A ring-type frequency-selective surfaces are uniformly distributed in vertical direction in dielectric layer；The ferrite layer is less than using working frequency
The ferrite of 2GHz；The ring-type frequency-selective surfaces use conductivity for the conductive material of 100-200S/m.
2. the sub-wavelength stratiform three-dimensional broadband absorbent structure based on loss-type frequency-selective surfaces according to claim 1,
It is characterized in that, the ring-type frequency-selective surfaces are made of the electrically conductive ink or conductive film being printed on polyester film.
3. the sub-wavelength stratiform three-dimensional broadband absorbent structure based on loss-type frequency-selective surfaces according to claim 1,
It is characterized in that, the ring-type frequency-selective surfaces are regular hexagon cyclic structure frequency-selective surfaces.
4. the sub-wavelength stratiform three-dimensional broadband absorbent structure based on loss-type frequency-selective surfaces according to claim 3,
It is characterized in that, the regular hexagon ring-type frequency-selective surfaces outer diameter is 15-17mm, internal diameter 11-13mm；Structural unit lattice
Constant is 18-22mm.
5. the sub-wavelength stratiform three-dimensional broadband absorbent structure based on loss-type frequency-selective surfaces according to claim 1,
It is characterized in that, the dielectric layer uses relative dielectric constant for the cystosepiment of 1.1-1.3, is 4.5-5.5mm per layer thickness, four layers
Overall thickness 18-22mm.
6. the sub-wavelength stratiform three-dimensional broadband absorbent structure based on loss-type frequency-selective surfaces according to claim 1,
It is characterized in that, the ferrite layer uses hexagonal lattice barium Conjugate ferrite, thickness 4.5-5.5mm.
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| CN201810365336.6A CN108493623B (en) | 2018-04-23 | 2018-04-23 | Sub-wavelength layered three-dimensional broadband wave-absorbing structure based on loss type frequency selective surface |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109659703A (en) * | 2018-11-27 | 2019-04-19 | 中国科学院金属研究所 | A kind of broadband electro-magnetic wave absorption Meta Materials merged based on foam medium sill with metal structure |
| CN110504553A (en) * | 2019-08-20 | 2019-11-26 | 航天科工武汉磁电有限责任公司 | A kind of multilayer ultra-wide band wave-absorber that electrically lossy material is compound with magnetic material |
| CN110676592A (en) * | 2019-11-04 | 2020-01-10 | 淮安信息职业技术学院 | Dual-polarized three-order band-pass three-dimensional frequency selection surface |
| CN110690580A (en) * | 2019-09-18 | 2020-01-14 | 中国科学院国家空间科学中心 | Terahertz low-loss two-dimensional multi-beam super-surface antenna and design method thereof |
| CN113056183A (en) * | 2021-01-18 | 2021-06-29 | 哈尔滨工业大学 | Electromagnetic shielding optical window with mesh grid structure based on medium-ultrathin doped metal-medium |
| CN114784516A (en) * | 2022-04-27 | 2022-07-22 | 中国人民解放军国防科技大学 | Metamaterial-based four-frequency-band terahertz absorber implementation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109659703A (en) * | 2018-11-27 | 2019-04-19 | 中国科学院金属研究所 | A kind of broadband electro-magnetic wave absorption Meta Materials merged based on foam medium sill with metal structure |
| CN109659703B (en) * | 2018-11-27 | 2021-01-12 | 中国科学院金属研究所 | Broadband electromagnetic wave absorption metamaterial based on fusion of foam dielectric base material and metal structure |
| CN110504553A (en) * | 2019-08-20 | 2019-11-26 | 航天科工武汉磁电有限责任公司 | A kind of multilayer ultra-wide band wave-absorber that electrically lossy material is compound with magnetic material |
| CN110690580A (en) * | 2019-09-18 | 2020-01-14 | 中国科学院国家空间科学中心 | Terahertz low-loss two-dimensional multi-beam super-surface antenna and design method thereof |
| CN110676592A (en) * | 2019-11-04 | 2020-01-10 | 淮安信息职业技术学院 | Dual-polarized three-order band-pass three-dimensional frequency selection surface |
| CN113056183A (en) * | 2021-01-18 | 2021-06-29 | 哈尔滨工业大学 | Electromagnetic shielding optical window with mesh grid structure based on medium-ultrathin doped metal-medium |
| CN113056183B (en) * | 2021-01-18 | 2022-10-28 | 哈尔滨工业大学 | Electromagnetic shielding optical window with mesh grid structure based on medium-ultrathin doped metal-medium |
| CN114784516A (en) * | 2022-04-27 | 2022-07-22 | 中国人民解放军国防科技大学 | Metamaterial-based four-frequency-band terahertz absorber implementation method |
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