CN114204280B - Microwave dual-band metamaterial wave absorber - Google Patents
Microwave dual-band metamaterial wave absorber Download PDFInfo
- Publication number
- CN114204280B CN114204280B CN202111534038.3A CN202111534038A CN114204280B CN 114204280 B CN114204280 B CN 114204280B CN 202111534038 A CN202111534038 A CN 202111534038A CN 114204280 B CN114204280 B CN 114204280B
- Authority
- CN
- China
- Prior art keywords
- layer
- electromagnetic resonance
- dielectric layer
- cross
- band
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000006096 absorbing agent Substances 0.000 title claims abstract description 55
- 239000002184 metal Substances 0.000 claims abstract description 32
- 229910052751 metal Inorganic materials 0.000 claims abstract description 32
- 238000000034 method Methods 0.000 claims abstract description 7
- 230000007797 corrosion Effects 0.000 claims abstract description 6
- 238000005260 corrosion Methods 0.000 claims abstract description 6
- 239000000126 substance Substances 0.000 claims abstract description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 16
- 229910052802 copper Inorganic materials 0.000 claims description 11
- 239000010949 copper Substances 0.000 claims description 11
- 230000000737 periodic effect Effects 0.000 claims description 3
- 238000003491 array Methods 0.000 claims 1
- 238000010521 absorption reaction Methods 0.000 abstract description 51
- 230000010287 polarization Effects 0.000 abstract description 12
- 238000012545 processing Methods 0.000 abstract description 3
- 238000009826 distribution Methods 0.000 description 10
- 230000005684 electric field Effects 0.000 description 10
- 238000010586 diagram Methods 0.000 description 7
- 239000003365 glass fiber Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 238000004088 simulation Methods 0.000 description 6
- 238000000862 absorption spectrum Methods 0.000 description 5
- 239000002131 composite material Substances 0.000 description 5
- 239000011889 copper foil Substances 0.000 description 5
- 239000002390 adhesive tape Substances 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000123 paper Substances 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 238000007731 hot pressing Methods 0.000 description 2
- 238000005470 impregnation Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 235000009161 Espostoa lanata Nutrition 0.000 description 1
- 240000001624 Espostoa lanata Species 0.000 description 1
- 244000137852 Petrea volubilis Species 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000002519 antifouling agent Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 230000022131 cell cycle Effects 0.000 description 1
- 238000003486 chemical etching Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000007603 infrared drying Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
- 239000002655 kraft paper Substances 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 239000005445 natural material Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000001931 thermography Methods 0.000 description 1
- 238000000411 transmission spectrum Methods 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
- H01Q15/0086—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices having materials with a synthesized negative refractive index, e.g. metamaterials or left-handed materials
Landscapes
- Aerials With Secondary Devices (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The invention discloses a microwave dual-band metamaterial absorber, which is formed by periodically arranging a plurality of unit structures; the unit structure comprises an electromagnetic resonance layer, a dielectric layer and a metal grounding layer; the electromagnetic resonance layer is positioned on the dielectric layer, the dielectric layer is positioned on the metal grounding layer, and the centers of the electromagnetic resonance layer, the dielectric layer and the metal grounding layer are overlapped in the vertical direction; printing a metal film on one side of the dielectric layer to serve as the metal grounding layer, and processing the electromagnetic resonance layer pattern on the other side by adopting a chemical corrosion process; the electromagnetic resonance layer consists of a closed ring, a cross and symmetrical rectangular strips, and the geometric centers of the closed square ring, the cross and the symmetrical rectangular strips are concentric with the geometric center of the electromagnetic resonance layer. The invention has very good absorption performance on microwaves of S wave band and X wave band at two specific frequencies, has the characteristics of insensitive polarization and wide angle incidence support, and can keep good absorption under the working environment with variable polarization angle and large incidence angle.
Description
Technical Field
The invention relates to the technical field of electromagnetic microwave metamaterial, in particular to a three-layer S-band and X-band wave absorber.
Background
Microwaves (microwaves) generally refer to alternating current signals having frequencies between 300MHz (3X 10 8 Hz) and 300GHz (3X 10 11 Hz), corresponding to wavelengths between 1m and 1 mm. The SHF frequency band can be divided into an S wave band (2-4 GHz), a C wave band (4-8 GHz), an X wave band (8-12 GHz), a Ku wave band (12-18 GHz) and a K wave band (18-26 GHz), and is the wave band most widely applied to radar and various satellites. The microwave has good mobility, large working bandwidth and more information which can be transmitted, and has wide application in the fields of communication, satellites, radar antennas and the like. The electromagnetic microwave absorber has wide application prospect in the fields of 5G communication, phased array radar, electromagnetic stealth and the like due to the efficient absorption of electromagnetic waves in microwave bands.
The metamaterial refers to an artificial composite material or a composite structure with extraordinary physical properties which are not possessed by a natural material, and can be prepared into a composite or hybrid material system with periodic or aperiodic artificial microstructure unit arrangement through strict and complex artificial design and preparation processing from atomic or molecular design according to application requirements by means of human intention. The metamaterial absorber is formed by a resonance type metamaterial, and mainly utilizes electromagnetic loss of the metamaterial medium material to convert incident electromagnetic waves into ohmic heat or other forms of energy so as to realize the absorption of the electromagnetic waves. Because the metamaterial absorber can realize near perfect absorption of incident electromagnetic waves in a specific frequency band through structural design of the functional unit, the metamaterial absorber becomes a hot spot research field in electromagnetic metamaterials. Meanwhile, the device has broad application prospects in the fields of antenna radars, electromagnetic stealth, sensing technologies, thermal imaging, biological detection, photovoltaic cells and the like due to the supernormal physical characteristics, simple structure, polarization insensitivity, perfect absorption and other absorption characteristics.
Disclosure of Invention
The invention aims to provide a microwave dual-band metamaterial absorber which has very good absorption performance on microwaves of an S wave band and an X wave band at two specific frequencies, has the characteristics of insensitive polarization and wide angle incidence support, and can keep good absorption under the working environment with a variable polarization angle and a large incidence angle; adjusting the size of the closed loop allows for flexibility in achieving absorption of specific frequencies. The invention has great potential in applications such as multi-frequency spectrum imaging, thermal radiation detection and the like, and the simple top layer resonance structure is easy to process and mass produce, thereby having application prospect and market in the stealth field.
The invention adopts the following technical scheme for realizing the purposes of the invention:
A microwave dual-band metamaterial absorber is formed by periodically arranging a plurality of unit structures; the unit structure comprises an electromagnetic resonance layer, a dielectric layer and a metal grounding layer; the electromagnetic resonance layer is positioned on the dielectric layer, the dielectric layer is positioned on the metal grounding layer, and the centers of the electromagnetic resonance layer, the dielectric layer and the metal grounding layer are overlapped in the vertical direction; the electromagnetic resonance layer consists of a closed ring, a cross and symmetrical rectangular strips, wherein the cross and the symmetrical rectangular strips are positioned in the closed ring, and the geometric centers of the closed square ring, the cross and the symmetrical rectangular strips are concentric with the geometric center of the electromagnetic resonance layer; the symmetrical rectangular strips consist of four rectangular strips with the same structure, each rectangular strip is obliquely arranged in one quadrant separated by the cross, and the four rectangular strips are arranged in a central symmetry mode.
Further, the material of the electromagnetic resonance layer is metallic copper, and the conductivity is 5.8X10 7 S/m.
Further, the rectangular strips are all 3.6mm in length and 0.6mm in width.
Further, the closed ring is a square ring, the side length of the closed ring is 11mm, and the width of the closed square ring is 0.6mm.
Further, the cross is a regular cross, the unilateral length v=8mm, and the unilateral width is 0.6mm.
Further, FR-4 is adopted for the dielectric layer, the dielectric constant is 4.3, and the loss tangent of the dielectric is 0.025.
Further, the unit period of the dielectric layer is 12mm, and the layer thickness is 1.0mm.
Further, a metal film is printed on one side of the dielectric layer to serve as the metal grounding layer, and the electromagnetic resonance layer pattern is processed on the other side of the dielectric layer by adopting a chemical corrosion process.
Further, the metal grounding layer is made of metal copper, and the conductivity is 5.8X10 7 S/m.
Further, the unit period of the metal ground layer was 12mm, and the layer thickness was 0.018mm.
The invention has the beneficial effects that:
the microwave dual-band metamaterial absorber realizes nearly perfect efficient absorption at two frequency points of 3.77GHz and 9.75GHz, and the absorption rate is higher than 99.8%.
The structure has the characteristic of thinness, and the total thickness of the structure is only 1.036mm and is only 0.013 of the wavelength at the lowest absorption frequency.
The resonant layer has a simple top layer resonant structure, and is formed by combining a closed ring, a cross and a rectangular strip structure, so that the resonant layer is easy to process and mass produce.
Has polarization insensitive characteristics and wide angle characteristics in Transverse Electric (TE) and Transverse Magnetic (TM) modes. The different polarization angles have no substantial effect on absorption properties; the absorption as a whole decreases with increasing angle of incidence, and still maintains an absorption of more than 80% at angles of incidence up to 60 °.
The FR-4 is adopted as the dielectric layer, so that the metamaterial absorber can be bent and folded to a certain extent, and the metamaterial absorber has better adaptability to the paving environment.
Drawings
FIG. 1 is a plan structure parameter diagram of a microwave dual-band metamaterial absorber according to the present invention;
FIG. 2 is a schematic diagram of boundary setting of a microwave dual-band metamaterial absorber according to the present invention;
FIG. 3 shows the absorption spectrum, reflection spectrum and transmission spectrum of a microwave dual-band metamaterial absorber at two frequency points according to the present invention;
FIG. 4 is an absorption spectrum diagram of a microwave dual-band metamaterial absorber according to the present invention with different incident angles;
FIG. 5 is an absorption spectrum diagram of a microwave dual-band metamaterial absorber with different polarization angles in TE mode;
FIG. 6 is a graph of absorption spectra of different polarization angles of a microwave dual-band metamaterial absorber in a TM mode;
FIG. 7 is a diagram showing an electric field distribution diagram of an electromagnetic resonance layer of a microwave dual-band metamaterial absorber at two absorption frequency points according to the present invention;
FIG. 8 is a graph showing the current distribution of the electromagnetic resonance layer of the microwave dual-band metamaterial absorber at two absorption frequency points;
FIG. 9 is a graph showing the magnetic field distribution of the dielectric layer of the microwave dual-band metamaterial absorber at two absorption frequency points according to the present invention;
fig. 10 is a schematic diagram showing the influence of different structural parameters of a microwave dual-band metamaterial absorber on absorptivity.
Detailed Description
The technical scheme of the invention is further described in detail below with reference to the accompanying drawings:
As shown in fig. 1 and 2, the present embodiment provides a microwave dual-band metamaterial absorber, which is formed by periodically arranging a plurality of unit structures; the unit structure comprises an electromagnetic resonance layer 1, a dielectric layer 2 and a metal grounding layer 3; the electromagnetic resonance layer 1 is positioned on the dielectric layer 2, the dielectric layer 2 is positioned on the metal grounding layer 3, and the centers of the electromagnetic resonance layer 1, the dielectric layer 2 and the metal grounding layer 3 are coincident in the vertical direction.
The electromagnetic resonance layer 1 is made of metallic copper, and the conductivity is 5.8X10 7 S/m; the length and the width of the boundary dimension of the electromagnetic resonance layer 1 are 11mm, and the layer thickness is 0.018mm;
the electromagnetic resonance layer 1 consists of a closed ring, a cross and symmetrical rectangular strips, wherein the cross and the symmetrical rectangular strips are positioned in the closed ring, and the geometric centers of the closed square ring, the cross and the symmetrical rectangular strips are concentric with the geometric center of the electromagnetic resonance layer 1; the closed ring is a square ring, the side length L=11 mm, and the width of the closed square ring is we=0.6 mm; the cross is a positive cross, the unilateral length V=8mm, and the unilateral width is 0.6mm; the symmetrical rectangular strips consist of four rectangular strips with the same structure, each rectangular strip is obliquely arranged in one quadrant separated by the cross, and the four rectangular strips are arranged in a central symmetry mode; each rectangular bar was of length V 1 = 3.6mm and width 0.6mm.
The dielectric layer 2 adopts FR-4 (composite material made of epoxy resin, filler and glass fiber), the dielectric constant is 4.3, and the loss tangent value of the dielectric is 0.025; the unit period (length and width) of the dielectric layer 2 was w=12 mm, and the layer thickness was 1.0mm.
Since the absorber of the metamaterial enables the sub-wavelength structure, the higher the absorption frequency of the absorber is, the smaller the unit structure size is. Thus, the method of processing the metamaterial absorber varies over different absorption frequency ranges. The dimensions of the microwave metamaterial absorber unit structures are typically between a few millimeters and a few tens of millimeters, and are therefore typically fabricated using printed circuit board technology. Generally, we use FR-4 (a composite of epoxy plus filler and glass fiber) as the dielectric layer and copper as the metal layer. We printed a metal film as a metal ground layer on one side of the FR-4 dielectric and used chemical etching on the other side to obtain a metal resonant layer pattern.
The material of the metal grounding layer 3 is metal copper, the conductivity is 5.8x 7 S/m, the unit period (length and width) of the metal grounding layer 3 is w=12 mm, and the layer thickness is 0.018mm.
As shown in fig. 1, specific parameters of the microwave dual-band metamaterial absorber are as follows: w=12 mm, l=11 mm, v=8 mm, we=0.6 mm, v 1 =3.6 mm.
The periodic array of the unit structures of the microwave dual-band metamaterial absorber are distributed in an N multiplied by N mode in the two-dimensional direction, wherein N is a positive integer.
The preparation process of the microwave dual-band metamaterial absorber comprises the following steps:
(1) And (3) batching: and obtaining the glass fiber board with electromagnetic parameters similar to those of the materials used for simulation through batching.
(2) Impregnation: the prepared glass fiber board is placed in an organic impregnation liquid with the vacuum pressure of 0.05MPa, and is kept for 40 to 60 minutes in an infrared drying tunnel which is preheated after being taken out.
(3) Combination: the glass fiber board and the copper foil are cut into squares of 180mm x 180mm by a kraft paper cutter and a copper foil cutter.
(4) Hot pressing: and pressing the copper plate and the glass fiber plate together by using a hot press, wherein the hot pressing time is 35 minutes, and the temperature is 240 ℃.
(5) Polishing: the copper plate is carefully polished by fine water sand paper and then cleaned.
(6) Developing: and rubbing the designed printed board sketch on the copper foil surface of the clean copper-clad plate by using a piece of duplicating paper.
(7) Mapping: the copper foil surface is covered by transparent adhesive tape paper, and the adhesive tape paper which is left outside the patterns on the copper foil surface after the patterns are developed is removed by a nicking tool and a ruler.
(8) And (3) corrosion: usually, ferric trichloride aqueous solution is adopted as corrosive liquid, the concentration range is 30% -40%, a proper temperature (not exceeding 50 ℃) is selected, a row pen is used for gently brushing or a wooden stick is used for clamping a circuit board for slightly shaking, so that the corrosion speed is increased, and after the corrosion is finished, clear water is used for flushing.
(9) Film uncovering: and removing the adhesive tape.
(10) Cleaning: and (3) dipping the cotton balls in dilute acetone solution to wipe off the protective paint on the surface to obtain a final product.
The simulation calculation results of the present invention are briefly described below:
And (3) performing simulation calculation by adopting electromagnetic calculation software CST STUDIO SUITE (CST). The software adopts a finite integration technology to divide grids for the structure, and performs electromagnetic calculation on each grid by applying Maxwell equations and boundary conditions. The computational domain boundary setting of the absorbing unit is shown in fig. 2. The incident wave source adopts a plane electromagnetic wave, and is incident along the z direction, and the incident wave vector is k; the electric field vector E is parallel to the x-direction and the magnetic field vector H is parallel to the y-direction. In the x and y directions, the boundary is set as a cell cycle Unit cell, and in the z direction, the boundary is set as an Open boundary Open. Thus, the whole boundary is presented as a Floquet period boundary, and the absorption effect of the wave-absorbing unit array can be simulated in a simulation mode.
The absorption performance of the microwave dual-band metamaterial absorber can be expressed by an absorption coefficient A (omega), and the absorption coefficient A (omega) can be deduced from a reflectivity R (omega) and a transmissivity T (omega) as follows: a (ω) =1-R (ω) -T (ω), R (ω) and T (ω) may be represented by a scattering parameter (S parameter), R (ω) = |s 11|2,T(ω)＝|S21|2. Since the thickness of the bottom fully covered copper layer is greater than the skin depth of the material copper for incident electromagnetic waves, the electromagnetic waves cannot be transmitted outward from the bottom layer, so T (ω) can be considered as 0. Therefore, the absorption rate a (ω) can be reduced to a (ω) =1-R (ω) =1- |s 11|2.
The absorption spectrum of the microwave dual-band metamaterial absorber is shown in figure 3, two absorption peaks of high-efficiency absorption can be arranged in a 0-12GHz wave band, the absorption frequencies are 3.77GHz and 9.75GHz respectively, and the absorption rate is more than 99.8%.
In practical applications, electromagnetic waves are often obliquely incident on the surface of an electromagnetic metamaterial absorber at a certain angle, so that it is necessary to study the absorption condition of the absorber on electromagnetic waves with different incident angles. Definition of the definitionIs the angle between the x-axis and the xoy plane. Since the absorber studied here is a symmetrical structure along both the midline and diagonal, it is only necessary to analyze the electromagnetic polarization between 0 ° and 45 °. As can be seen from fig. 4, when a plane wave is perpendicularly incident on the wave-absorbing body,The absorption rate change range of the curve at the absorption frequency point is small within the range of 0-45 degrees, and the curve shows good polarization stability.
Fig. 5 (TE) and fig. 6 (TM) respectively discuss the absorption rate of TE and TM waves when they are obliquely incident on the surface of the absorber. The TE mode herein means that the electric field of the incident wave always remains parallel to the metallic surface of the absorber; and the TM mode means that the magnetic field of the incident wave is always parallel to the metal surface of the wave absorber. In CST software, mode excitation is set to TE mode and TM mode successively, and two times of value simulation are carried out respectively, and the included angle between the x-axis and the xy-plane is formed during simulationThe absorber is set to be 0 degrees, so that theta is changed between 0 degrees and 80 degrees, the corresponding absorption rate conditions are shown in figures 5 and 6, and the absorber shows good stability in the range of 0 degrees to 80 degrees, namely for TE mode electromagnetic waves and TM mode electromagnetic waves. But from the 80 plot of the two modes, the frequency point at the first absorption peak is shifted; at the second absorption peak, its peak value decreases. This is because the adjacent absorption units are closely spaced, the coupling between the units is strong, and the coupling is sensitive to the angular variation of oblique man-made rays, resulting in deterioration of the stability of electromagnetic wave absorption.
As shown in fig. 7, at the low frequency absorption point, the electric field of the electromagnetic resonance layer is mainly distributed on the closed loop. At the high frequency absorption point, the electric field of the electromagnetic resonance layer is mainly distributed outside the inner cross, and part of the electric field is distributed on the small rectangle. The electric field distribution causes charge to flow forming a surface current.
As shown in fig. 8, the distribution of the surface current of the electromagnetic resonance layer coincides with the electric field distribution, and the low-frequency absorption points are concentrated on both sides of the closed loop, and the high-frequency absorption points are concentrated on both sides of the cross. Due to the polarization of the dielectric layer, the electric field of the ground layer exhibits an opposite distribution to that of the top layer, which causes the current of the bottom layer to be exactly opposite to that of the top layer. The pair of antiparallel currents of the electromagnetic resonance layer and the metallic ground layer can be equivalently a pair of magnetic dipoles, thereby generating magnetic resonance in the dielectric layer and consuming the energy of the incident electromagnetic wave.
As shown in fig. 9, at the low frequency absorption point, the absorption of the incident electromagnetic wave by the absorber is mainly due to the combined action of the electric resonance occurring at the closed loop of the electromagnetic resonance layer and the magnetic resonance occurring in the corresponding dielectric layer; at the high-frequency absorption point, the absorption of electromagnetic waves by the absorber is realized mainly by the combined action of the electric resonance of the internal cross which occurs in the electromagnetic resonance layer and the magnetic resonance which occurs in the corresponding dielectric layer. This is consistent with the absorption law of closed-loop and cross structures due to the sub-wavelength characteristics of the metamaterial absorber. The wavelength of the incident electromagnetic wave is longer at low frequencies, and the structure of the absorber that generates electromagnetic resonance should be correspondingly increased, so that absorption occurs at low frequencies at closed loops of larger structural dimensions and at high frequencies at cross structures of relatively smaller structural dimensions.
As shown in fig. 10, the parameter analysis is consistent with the results of the electric field distribution, the current distribution and the magnetic field distribution, and it can be seen that the size L of the closed loop mainly affects the absorption of the low frequency band, and it can be seen from fig. 9 that the first frequency band has a significant red shift with the change of L; the geometric parameter V of the cross structure mainly influences the absorption of the second band, and the second band is obviously red shifted.
While the preferred embodiment of the present invention has been illustrated and described, it will be understood by those skilled in the art that the present invention may be embodied in other specific forms and equivalents thereof without departing from the spirit of the invention.
Claims (10)
1. The microwave dual-band metamaterial absorber is characterized by being formed by a plurality of periodic arrays of unit structures; the unit structure comprises an electromagnetic resonance layer, a dielectric layer and a metal grounding layer; the electromagnetic resonance layer is positioned on the dielectric layer, the dielectric layer is positioned on the metal grounding layer, and the centers of the electromagnetic resonance layer, the dielectric layer and the metal grounding layer are overlapped in the vertical direction;
The electromagnetic resonance layer consists of a closed ring, a cross and symmetrical rectangular strips, wherein the cross and the symmetrical rectangular strips are positioned in the closed ring, and the geometric centers of the closed square ring, the cross and the symmetrical rectangular strips are concentric with the geometric center of the electromagnetic resonance layer; the symmetrical rectangular strips consist of four rectangular strips with the same structure, each rectangular strip is obliquely arranged in one quadrant separated by the cross, and the four rectangular strips are arranged in a central symmetry mode and are distributed in an axisymmetric mode through symmetry axes of the cross.
2. The microwave dual-band metamaterial absorber according to claim 1, wherein the electromagnetic resonance layer is made of metallic copper, and the conductivity is 5.8x 7 S/m.
3. A microwave dual-band metamaterial absorber according to claim 2 wherein the rectangular strips are each 3.6mm in length and 0.6mm in width.
4. The microwave dual-band metamaterial absorber according to claim 2, wherein the closed ring is a square ring, the side length of the closed ring is 11mm, and the width of the closed square ring is 0.6mm.
5. The microwave dual-band metamaterial absorber according to claim 2, wherein the cross is a positive cross, the unilateral length v=8mm, and the unilateral width is 0.6mm.
6. The microwave dual-band metamaterial absorber according to claim 1, wherein the dielectric layer is FR-4, the dielectric constant is 4.3, and the loss tangent of the medium is 0.025.
7. A microwave dual-band metamaterial absorber according to claim 6 wherein the unit period of the dielectric layer is 12mm and the layer thickness is 1.0mm.
8. The microwave dual-band metamaterial absorber according to claim 1, wherein a metal film is printed on one side of the dielectric layer to serve as the metal grounding layer, and a chemical corrosion process is adopted on the other side of the dielectric layer to process the electromagnetic resonance layer pattern.
9. The microwave dual-band metamaterial absorber according to claim 1, wherein the metal grounding layer is made of metal copper, and the conductivity is 5.8x 7 S/m.
10. A microwave dual-band metamaterial absorber according to claim 9 wherein the unit period of the metal ground layer is 12mm and the layer thickness is 0.018mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111534038.3A CN114204280B (en) | 2021-12-15 | 2021-12-15 | Microwave dual-band metamaterial wave absorber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111534038.3A CN114204280B (en) | 2021-12-15 | 2021-12-15 | Microwave dual-band metamaterial wave absorber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114204280A CN114204280A (en) | 2022-03-18 |
| CN114204280B true CN114204280B (en) | 2024-08-20 |
Family
ID=80654022
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111534038.3A Active CN114204280B (en) | 2021-12-15 | 2021-12-15 | Microwave dual-band metamaterial wave absorber |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114204280B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104485515A (en) * | 2014-10-27 | 2015-04-01 | 武汉市工程科学技术研究院 | A broadband absorbing material loaded with lumped elements |
| CN107069234A (en) * | 2017-04-18 | 2017-08-18 | 中国电子科技集团公司第三十八研究所 | A kind of ultra wide band inhales ripple narrow band transmission electromagnetic bandgap structure and its application |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130314765A1 (en) * | 2012-05-25 | 2013-11-28 | The Trustees Of Boston College | Metamaterial Devices with Environmentally Responsive Materials |
| WO2014079298A1 (en) * | 2012-11-20 | 2014-05-30 | 深圳光启创新技术有限公司 | Metamaterial, metamaterial preparation method and metamaterial design method |
| CN113036444B (en) * | 2021-03-10 | 2023-05-16 | 南京邮电大学 | Polarization insensitive metamaterial dual-frequency terahertz absorber |
-
2021
- 2021-12-15 CN CN202111534038.3A patent/CN114204280B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104485515A (en) * | 2014-10-27 | 2015-04-01 | 武汉市工程科学技术研究院 | A broadband absorbing material loaded with lumped elements |
| CN107069234A (en) * | 2017-04-18 | 2017-08-18 | 中国电子科技集团公司第三十八研究所 | A kind of ultra wide band inhales ripple narrow band transmission electromagnetic bandgap structure and its application |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114204280A (en) | 2022-03-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Chen et al. | High-impedance surface-based broadband absorbers with interference theory | |
| CN107465000B (en) | Broadband, polarization-insensitive spiral coding RCS (radar cross section) reduction super surface and design method thereof | |
| CN108470973B (en) | Broadband RCS (radio control system) reduced super surface based on gap loading | |
| Yuan et al. | Wideband high-absorption electromagnetic absorber with chaos patterned surface | |
| JP4944044B2 (en) | Method and configuration for reducing radar cross section of integrated antenna | |
| CN107240778A (en) | Metamaterial antenna cover | |
| Lee et al. | Ultra‐thin polarization independent absorber using hexagonal interdigital metamaterial | |
| Sekar et al. | An ultra-thin compact wideband metamaterial absorber | |
| CN109742554B (en) | Double-frequency Ku waveband circularly polarized sensitive wave absorber | |
| CN104070731A (en) | Broadband high-performance manual terahertz wave-absorbing material and design method thereof | |
| Jamilan et al. | Design and characterization of a dual-band metamaterial absorber based on destructive interferences | |
| Ren et al. | Design of a quad-band wide-angle microwave metamaterial absorber | |
| Sood et al. | A wideband wide-angle ultra-thin metamaterial microwave absorber | |
| CN114204280B (en) | Microwave dual-band metamaterial wave absorber | |
| Khanna et al. | A single layer wideband metasurface absorber for electromagnetic interference minimization in Ku-band applications | |
| Fikry et al. | Thin EM wave absorber metasurface based on artificial magnetic conductor | |
| CN104409804A (en) | Frequency selective surface with switching characteristic and design method | |
| Cui et al. | Topological flexible metamaterials with isotropic dual-frequency terahertz-band absorption | |
| CN113471714A (en) | Ultra-wideband fractal medium resonance wave absorber based on 3D printing and method | |
| Bian et al. | A New Triple-band Polarization-insensitive Wide-angle Microwave Metamaterial Absorber. | |
| Russer et al. | Organic millimeterwave fishnet metamaterial structures | |
| Kim et al. | Surface waves and leaky waves in integrated circuit structures with planar periodic dipole loading | |
| Liu et al. | Research on multi-band absorbers based on electromagnetic metamaterials | |
| Haruta et al. | Wideband wave absorber at X frequency band using transparent resistive film | |
| Yagitani et al. | Numerical analysis and visualization of spherical waves absorbed by a thin metamaterial absorber |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |