CN117878619A - Ultrathin broadband wave-absorbing metamaterial structure based on simple resistor surface - Google Patents
Ultrathin broadband wave-absorbing metamaterial structure based on simple resistor surface Download PDFInfo
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- 230000000737 periodic effect Effects 0.000 claims abstract description 11
- 239000003989 dielectric material Substances 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims description 17
- 229910052751 metal Inorganic materials 0.000 claims description 14
- 239000002184 metal Substances 0.000 claims description 14
- 239000000758 substrate Substances 0.000 claims description 8
- 239000002002 slurry Substances 0.000 claims description 7
- 238000005516 engineering process Methods 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 claims description 4
- 229920007790 polymethacrylimide foam Polymers 0.000 claims description 4
- 238000001755 magnetron sputter deposition Methods 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 2
- 239000000919 ceramic Substances 0.000 claims description 2
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 239000010949 copper Substances 0.000 claims description 2
- 229910021389 graphene Inorganic materials 0.000 claims description 2
- 238000007650 screen-printing Methods 0.000 claims description 2
- 238000010521 absorption reaction Methods 0.000 abstract description 25
- 230000010287 polarization Effects 0.000 abstract description 13
- 239000011358 absorbing material Substances 0.000 abstract description 11
- 238000010586 diagram Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 238000001514 detection method Methods 0.000 description 4
- 238000009826 distribution Methods 0.000 description 3
- 238000002310 reflectometry Methods 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000006855 networking Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000004083 survival effect Effects 0.000 description 1
Classifications
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- 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
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- Aerials With Secondary Devices (AREA)
Abstract
The invention discloses an ultrathin broadband wave-absorbing metamaterial structure based on a simple resistor surface, and belongs to the technical field of wave-absorbing materials. The invention is formed by two-dimensional periodic arrangement of a plurality of wave-absorbing unit structures, wherein the wave-absorbing unit structure comprises a plurality of structural layers which are sequentially laminated from top to bottom, and each layer is of a central symmetrical structure; the relative impedance of the ultra-thin broadband wave-absorbing metamaterial structure in a broadband frequency range is matched with free space through the positions and layout configuration of the double-layer resistive film and the three-layer dielectric material and the selection of the dielectric material with low dielectric constant. By utilizing the loss characteristic of the double-layer resistor film, when electromagnetic waves enter an ultrathin broadband wave-absorbing metamaterial structure, ohmic loss is generated by flowing equivalent current on the surface of the resistor film, and broadband absorption of the electromagnetic waves is realized; the structure adopts a quadruple symmetrical structure, reduces the influence of the polarization direction of the incident electromagnetic wave on the absorption rate, and has excellent broadband polarization insensitivity and oblique incidence wide angle stability. The invention also has the advantages of easy realization of structure, low cost and the like.
Description
Technical Field
The invention relates to an ultrathin broadband wave-absorbing metamaterial structure based on a simple resistor surface, and belongs to the technical field of wave-absorbing materials.
Background
Along with the acceleration of the new military revolution of the world, the remote accurate, intelligent, stealth and unmanned trend of weaponry is more remarkable. The stealth performance has become the typical characteristic and important capability of new generation weapon equipment, and especially with the improvement of networking capability among various early warning detection and interception striking systems, the stealth performance becomes the key of survival and burst prevention of military aircrafts.
The high-speed aircraft and the power system are limited by aerodynamic appearance and functions, the appearance stealth technology is greatly limited, and the wave-absorbing material technology has become an important outgoing path for improving the stealth performance of the radar. The wave absorbing material can effectively dissipate electromagnetic wave energy, and is widely applied to the aspects of radar cross section reduction, electromagnetic interference shielding, stealth technology and the like. The metamaterial is used as one of artificial electromagnetic materials, is designed based on a metamaterial principle, utilizes resonance, ohmic loss, dielectric loss and the like generated by a unit structure of the metamaterial to realize the restraint and absorption of incident electromagnetic waves, can greatly reduce the thickness of the traditional wave-absorbing material, increase the working frequency bandwidth, reduce the volume weight and the processing cost, is easy to conform to a platform, and is widely applied in the stealth field.
Wave absorbing materials are commonly used on the surfaces of critical components of an aircraft, and the thickness of the surface material of the aircraft has direct influence on aerodynamic performance and stealth performance, so that the larger thickness of the traditional wave absorbing material causes additional wind resistance and load, and limits the speed and maneuverability of the aircraft. Therefore, the novel wave absorbing material should have ultra-thin characteristics to reduce the thickness of critical components of the overall aircraft. With the continuous progress of radar technology, the aircraft needs to realize effective stealth performance in a wider frequency band to resist various early warning detection and interception striking systems, so that the broadband wave-absorbing characteristic of the wave-absorbing metamaterial is one of the keys of successful application of the wave-absorbing metamaterial to the aircraft, and can ensure that electromagnetic wave energy is effectively absorbed in various radar wave bands and improve stealth performance.
Therefore, the wave absorbing material organically combines the thin thickness, the simple structure and the broadband wave absorbing performance, not only meets the optimization requirements on various aspects of the performance of the aircraft, but also provides a more comprehensive and efficient wave absorbing material solution for future aircraft design. Various methods have been tried to expand the bandwidth of absorption, such as loading lumped resistance on the metal resonant surface, using magnetic absorbing materials, etc. However, most of these methods have the defects of complex structure, high manufacturing cost, large thickness and the like, and there is a need for designing broadband wave absorption and oblique incidence angle stability which can realize the frequency band of 3-18 GHz below 10mm thickness.
In summary, it is required to provide an ultrathin broadband wave-absorbing metamaterial with a simple structure and stable oblique incidence angle.
Disclosure of Invention
Aiming at the problems in the prior art or the above, the main purpose of the invention is to provide an ultrathin broadband wave-absorbing metamaterial structure based on a simple resistor surface, which is characterized in that the relative impedance of the ultrathin broadband wave-absorbing metamaterial structure in a broadband frequency range is well matched with free space by reasonably configuring the positions and the layout of a double-layer resistor film and a three-layer dielectric material and selecting a dielectric material with a low dielectric constant, so that the reflectivity of electromagnetic waves is reduced. By utilizing the loss characteristic of the double-layer resistor film, when electromagnetic waves enter an ultrathin broadband wave-absorbing metamaterial structure, the surface of the resistor film flows through equivalent current to generate ohmic loss, so that a large amount of electromagnetic wave energy is lost, and broadband absorption of the ultrathin broadband wave-absorbing metamaterial on the electromagnetic waves is realized; the four-fold symmetrical structure is adopted, so that the influence of the polarization direction of the incident electromagnetic wave on the absorptivity is reduced, and the wave-absorbing metamaterial has excellent broadband polarization insensitivity and oblique incidence wide angle stability. The wave-absorbing metamaterial provided by the invention realizes the broadband wave-absorbing performance of 3-18 GHz frequency band under the condition that the structural thickness is lower than 10mm, provides the aircraft with the effective stealth performance in a wider frequency band to resist various early warning detection and interception striking systems, and has the advantages of easiness in structural realization, low cost and the like.
The thickness of the ultrathin finger-wave absorbing metamaterial structure is smaller than 10mm.
The working frequency range of the broadband finger-wave absorbing metamaterial structure is 3-18 GHz.
The invention aims at realizing the following technical scheme:
the invention discloses an ultrathin broadband wave-absorbing metamaterial structure based on a simple resistor surface, which is formed by two-dimensional periodic arrangement of a plurality of wave-absorbing unit structures, wherein each wave-absorbing unit structure comprises a plurality of structural layers which are sequentially laminated from top to bottom, each layer is of a central symmetrical structure, and the structure sequentially comprises the following steps: the first dielectric layer, the first resistance film layer, the second dielectric layer, the second resistance film layer, the third dielectric layer and the metal backboard. The first resistance film layer and the second resistance film layer are composed of a patterned resistance film and a PET substrate layer.
The periodic length and the periodic width of the periodic arrangement of the wave absorbing unit structure are p.
The patterned resistive films in the first resistive film layer and the second resistive film layer are made of resistive slurry materials, wherein the resistive slurry materials are selected from one of indium tin oxide, graphene and conductive ceramic slurry, and the square resistance is 100-150 Ω/sq. The pattern is a square pattern, and the side length of the square is L. Electromagnetic waves are incident into the wave-absorbing metamaterial structure to generate electromagnetic resonance, equivalent current is generated on the surface of the resistor film, and ohmic loss is generated by the equivalent current through the resistor film, so that a large amount of electromagnetic wave energy is lost.
The thickness of the PET basal layer in the first resistance film layer and the second resistance film layer is 0.125-0.175 mm. Since the thickness of the patterned resistor film is only tens to hundreds of micrometers, the patterned resistor film is arranged on the PET substrate layer by a magnetron sputtering mode or a screen printing technology to form a resistor film layer.
The materials of the first dielectric layer and the third dielectric layer are the same quartz glass, the thicknesses are the same, the relative dielectric constant is 3.6-4.2, the electric loss tangent is 0.001-0.02, and the thickness is 2-3 mm. By selecting the dielectric material with low dielectric constant, the equivalent impedance of the whole structure of the wave-absorbing metamaterial is matched with the impedance of free space, so that a large amount of electromagnetic waves enter the inside of the structure of the wave-absorbing metamaterial, and the ultra-thin broadband wave-absorbing metamaterial can absorb the electromagnetic waves in a broadband mode.
The second dielectric layer is made of PMI foam, the thickness is 2.5-4.0 mm, the relative dielectric constant is 1.1-1.5, and the electrical loss tangent is 0.001-0.01.
The metal backboard material is selected from copper or aluminum in conductive metal, and the thickness is 0.1-0.2 mm. The metal backboard can enable the incident electromagnetic wave to be totally reflected, and enable the electromagnetic wave to be reflected, interfered and scattered for multiple times in the wave-absorbing metamaterial structure, so that various modes of loss of the electromagnetic wave can be realized.
The invention discloses a working method of an ultrathin broadband wave-absorbing metamaterial structure based on a simple resistor surface, which comprises the following steps:
in the working process, the positions and layout of the double-layer resistive film and the three-layer dielectric material are configured and the dielectric material with low dielectric constant is selected, so that the relative impedance of the ultra-thin broadband wave-absorbing metamaterial structure in a broadband frequency range is matched with the impedance of free space, when electromagnetic waves are incident on the surface of the wave-absorbing metamaterial structure, a large amount of electromagnetic waves enter the wave-absorbing metamaterial structure, the reflectivity of the electromagnetic waves is very low in the process, the reflection of the electromagnetic waves can be remarkably reduced, and the absorptivity of the ultra-thin broadband wave-absorbing metamaterial structure to the electromagnetic waves is further improved. When the electromagnetic wave propagates into the wave-absorbing metamaterial structure, electromagnetic resonance is generated, equivalent current is generated on the surface of the resistor film, and the equivalent current generates ohmic loss through the resistor film, so that a large amount of electromagnetic wave energy is lost, and broadband absorption of the electromagnetic wave by the ultra-thin broadband wave-absorbing metamaterial is realized.
The beneficial effects are that:
1. according to the ultrathin broadband wave-absorbing metamaterial structure based on the simple resistor surface, through the position and layout configuration of the double-layer resistor film and the three-layer dielectric material and the low-dielectric-constant dielectric material, the relative impedance of the ultrathin broadband wave-absorbing metamaterial structure in a broadband frequency range is well matched with the impedance of a free space, so that a large amount of electromagnetic waves enter the wave-absorbing metamaterial structure, the reflectivity of the electromagnetic waves is reduced, and the absorptivity of the ultrathin broadband wave-absorbing metamaterial structure to the electromagnetic waves is further improved.
2. According to the ultrathin broadband wave-absorbing metamaterial structure based on the simple resistor surface, on the basis that a large amount of electromagnetic waves enter the wave-absorbing metamaterial structure, electromagnetic waves are incident into the wave-absorbing metamaterial structure to generate electromagnetic resonance, equivalent current is generated on the resistor film surface, ohmic loss is generated by the equivalent current through the resistor film, and a large amount of electromagnetic wave energy is further lost, so that broadband absorption of the ultrathin broadband wave-absorbing metamaterial on the electromagnetic waves is realized.
3. The ultrathin broadband wave-absorbing metamaterial structure based on the simple resistor surface disclosed by the invention adopts a double-layer resistor film structure to absorb waves, and the two layers of resistor film patterns are completely the same as the sheet resistance of the resistive slurry material, so that the ultrathin broadband wave-absorbing metamaterial structure is convenient to prepare.
4. The ultrathin broadband wave-absorbing metamaterial structure based on the simple resistor surface adopts a quadruple symmetrical structure, so that the influence of the polarization direction of incident electromagnetic waves on the absorptivity is reduced, the absorptivity of the ultrathin broadband wave-absorbing metamaterial structure is consistent when the electromagnetic waves are incident at different polarization angles, and the wave-absorbing metamaterial still maintains stable absorptivity within the incident angle range of 0-45 degrees when TE and TM polarized waves are incident, and the absorptivity is more than 80%, so that the wave-absorbing metamaterial shows excellent broadband polarization insensitivity and oblique incidence wide angle stability.
5. According to the ultrathin broadband wave-absorbing metamaterial structure based on the simple resistor surface, on the basis of achieving beneficial effects 1, 2, 3 and 4, broadband wave-absorbing performance of a 3-18 GHz frequency band is achieved under the condition that the structural thickness is lower than 10mm, effective stealth performance in a wider frequency band is provided for an aircraft, and various early warning detection and interception striking systems can be further resisted.
Drawings
FIG. 1 is a schematic view of a 4×4 array wave-absorbing metamaterial according to embodiment 1 of the present invention;
fig. 2 is a schematic diagram of the structure of a wave absorbing unit according to embodiment 1 of the present invention;
FIG. 3 is a top view of the first resistive film layer and the second resistive film layer of embodiment 1 of the present invention;
FIG. 4 is a graph showing the absorption rate under normal incidence of electromagnetic waves in example 1 of the present invention;
FIG. 5 is a graph showing the distribution of surface currents at different resonance frequency points according to example 1 of the present invention;
FIG. 6 is a graph of simulated absorption rate at different polarization angles for example 1 of the present invention;
FIG. 7 is a graph showing the absorption rate of TE polarized waves at different incidence angles according to example 1 of the present invention;
FIG. 8 is a graph showing the absorption rate of the TM polarized wave according to example 1 of the present invention at different incident angles;
FIG. 9 is a schematic structural diagram of a wave-absorbing metamaterial according to embodiment 2 of the present invention;
FIG. 10 is a diagram of a solid sample of wave-absorbing metamaterial implemented in accordance with embodiment 2 of the present invention;
FIG. 11 is a graph showing the simulated absorption rate under the condition of normal incidence of electromagnetic waves in example 2 of the present invention;
FIG. 12 is a graph showing the absorption rate of the experimental test under the condition of normal incidence of electromagnetic waves in example 2 of the present invention;
wherein: 1-first dielectric layer, 2-first resistance film layer, 3-second dielectric layer, 4-second resistance film layer, 5-third dielectric layer, 6-metal backboard, 7-patterned resistance film and 8-PET substrate layer.
Detailed Description
For a better description of the objects and advantages of the present invention, the following description will be given with reference to the accompanying drawings and examples.
Example 1:
the embodiment discloses an ultrathin broadband wave-absorbing metamaterial structure based on a simple resistor surface, wherein the wave-absorbing metamaterial is formed by periodically arranging a plurality of wave-absorbing unit structures in a two-dimensional direction, for example, when the wave-absorbing unit structures are arranged in a 4×4 manner in the two-dimensional direction, and a schematic structural diagram is shown in fig. 1. Any wave-absorbing unit structure is taken for analysis, and as shown in fig. 2, the wave-absorbing unit structure comprises a plurality of structural layers which are sequentially laminated from top to bottom, each layer is of a central symmetrical structure, and the wave-absorbing unit structure sequentially comprises: the first dielectric layer 1, the first resistor film layer 2, the second dielectric layer 3, the second resistor film layer 4, the third dielectric layer 5 and the metal backboard 6. The first resistive film layer 2 and the second resistive film layer 4 are composed of a patterned resistive film 7 and a PET substrate layer 8.
The length and width dimensions p of the wave-absorbing unit structure are 16mm.
The patterned resistive films 7 in the first resistive film layer 2 and the second resistive film layer 4 are made of a resistive paste material, wherein the resistive paste material is indium tin oxide, and the square resistance is 145 Ω/sq. The pattern is a square pattern with a square side length L of 14mm and a PET substrate layer thickness of 0.125mm, and a top view of the first resistive film layer 2 or the second resistive film layer 4 is shown in FIG. 3.
The materials of the first dielectric layer 1 and the third dielectric layer 5 are the same quartz glass, the thicknesses are the same, the relative dielectric constant is 3.9, the electric loss tangent is 0.01, and the thickness is 2.6mm.
The second dielectric layer 3 is made of PMI foam, the relative dielectric constant is 1.15, the electric loss tangent is 0.001, and the thickness is 3.8mm.
The metal backboard 6 is made of aluminum, and the thickness is 0.1mm.
The total thickness of the structure is 9.35mm.
The wave absorbing performance of the ultra-thin broadband wave absorbing metamaterial structure realized by the embodiment is obtained through numerical simulation software CST Studio Suite2023, and the ultra-thin broadband wave absorbing metamaterial structure formed by periodic arrangement of infinite unit structures is realized by applying periodic unit boundary conditions to the wave absorbing unit structures during simulation, so that a field distribution diagram and an absorption rate result diagram shown in fig. 4-8 are obtained through simulation.
As shown in FIG. 4, under the condition of normal incidence of electromagnetic waves, the ultra-thin broadband wave-absorbing metamaterial structure has an absorptivity of more than 90% in the frequency range of 2.9-18 GHz, and broadband absorption performance under the condition that the structure thickness is lower than 10mm is realized.
As shown in fig. 5, the surface current distribution on the two patterned resistive films was simulated, and high absorption was generated at the resonance frequency due to strong electromagnetic resonance response, and larger ohmic loss was generated where the current was concentrated, further improving the absorption efficiency, and the surface current was concentrated mainly at the lower resistive film at the lowest resonance frequency of 3.8 GHz. At a resonance frequency of 13.3GHz, the surface current is concentrated on the upper resistive film.
As shown in fig. 6, when the polarization angle of the electromagnetic wave is gradually increased from 0 ° to 90 °, the polarization angle of the incident electromagnetic wave has little effect on the absorptivity of the ultra-thin broadband wave-absorbing metamaterial structure in the case of normal incidence of the electromagnetic wave. Therefore, the wave-absorbing metamaterial has excellent polarization insensitivity.
As shown in fig. 7, when the incident angle is changed within the range of 15 ° -60 ° under TE polarization, the absorption rate is attenuated with the increase of the incident angle, and when the incident angle is 30 °, the change of the overall absorption rate curve is small, and the wave absorbing performance of the ultra-thin broadband wave absorbing metamaterial structure is hardly affected. When the incident angle is increased to 45 degrees, the wave absorbing performance is continuously weakened, and the absorption rate of more than 80% can be maintained in the frequency range of 3.2-18 GHz. Therefore, the wave-absorbing metamaterial has good oblique incidence angle stability in a TE polarized wave mode.
As shown in FIG. 8, when the incident angle is changed within the range of 15-60 DEG under TM polarization, the bandwidth of the ultra-thin broadband wave-absorbing metamaterial structure is changed less, and the absorptivity is kept above 90%. Therefore, the wave-absorbing metamaterial has good oblique incidence angle stability in a TM polarized wave mode.
Example 2:
as shown in fig. 9, the ultra-thin broadband wave-absorbing metamaterial structure based on the simple resistor surface disclosed in this embodiment is formed by arranging 100 wave-absorbing unit structures in 10×10 in a two-dimensional direction. The wave absorbing unit structure comprises a plurality of structural layers which are sequentially laminated from top to bottom, each layer is of a central symmetry structure, and the wave absorbing unit structure sequentially comprises: the first dielectric layer 1, the first resistor film layer 2, the second dielectric layer 3, the second resistor film layer 4, the third dielectric layer 5 and the metal backboard 6. The first resistive film layer 2 and the second resistive film layer 4 are composed of a patterned resistive film 7 and a PET substrate layer 8.
The length and width dimensions p of the wave-absorbing unit structure are 20mm.
The patterned resistive films 7 in the first resistive film layer 2 and the second resistive film layer 4 are made of a resistive paste material, wherein the resistive paste material is indium tin oxide, and the square resistance is 105 Ω/sq. The pattern is a square pattern, the side length L of the square is 16mm, and the thickness of the PET basal layer is 0.125mm.
The materials of the first dielectric layer 1 and the third dielectric layer 5 are the same quartz glass, the thicknesses are the same, the relative dielectric constant is 3.9, the electric loss tangent is 0.01, and the thickness is 2.6mm.
The second dielectric layer 3 is made of PMI foam, the relative dielectric constant is 1.15, the electric loss tangent is 0.001, and the thickness is 3.0mm.
The metal backboard 6 is made of aluminum, and the thickness is 0.1mm.
The total thickness of the structure is 8.55mm.
The total size of the wave-absorbing metamaterial is 200mm multiplied by 8.55mm.
As shown in fig. 10, the wave-absorbing metamaterial solid sample is prepared, wherein the patterned resistive film is an ITO film and is disposed on the surface of the PET layer by means of magnetron sputtering. The wave absorbing performance of the wave absorbing metamaterial realized by the embodiment is simulated by a numerical simulation software CST Studio Suite2023, and the simulation results in an absorption rate result diagram shown in FIG. 11. The absorptivity is more than 90% in the frequency range of 3.1-18 GHz.
An absorption rate test experiment is carried out by using an arch method test platform, so that the absorption rate of the wave-absorbing metamaterial entity sample piece is tested when electromagnetic waves are perpendicularly incident, as shown in fig. 12, the absorption rate is more than 90% in the frequency range of 3.1-17.4 GHz, and the broadband wave-absorbing performance of the ultrathin broadband wave-absorbing metamaterial structure is realized under the condition that the thickness of the ultrathin broadband wave-absorbing metamaterial structure is lower than 10mm.
While the foregoing is directed to embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
Claims (7)
1. An ultrathin broadband wave-absorbing metamaterial structure based on a simple resistor surface is characterized in that: the two-dimensional periodic arrangement of the wave-absorbing unit structure comprises a plurality of structural layers which are sequentially laminated from top to bottom, wherein each layer is of a central symmetrical structure, and the wave-absorbing unit structure sequentially comprises the following components in percentage by weight: the first dielectric layer, the first resistance film layer, the second dielectric layer, the second resistance film layer, the third dielectric layer and the metal backboard; the first resistance film layer and the second resistance film layer are composed of a patterned resistance film and a PET substrate layer;
the periodic length and the periodic width of the periodic arrangement of the wave absorbing unit structure are p.
2. The ultra-thin broadband wave-absorbing metamaterial structure based on the simple resistance surface as set forth in claim 1, wherein the ultra-thin broadband wave-absorbing metamaterial structure is characterized in that: the patterned resistive films in the first resistive film layer and the second resistive film layer are made of resistive slurry materials, wherein the resistive slurry materials are selected from one of indium tin oxide, graphene and conductive ceramic slurry, and the square resistance is 100-150 Ω/sq; the pattern is a square pattern, and the side length of the square is L; electromagnetic waves are incident into the wave-absorbing metamaterial structure to generate electromagnetic resonance, equivalent current is generated on the surface of the resistor film, and ohmic loss is generated by the equivalent current through the resistor film, so that a large amount of electromagnetic wave energy is lost.
3. The ultra-thin broadband wave-absorbing metamaterial structure based on the simple resistance surface as set forth in claim 1, wherein the ultra-thin broadband wave-absorbing metamaterial structure is characterized in that: the thickness of the PET basal layer in the first resistance film layer and the second resistance film layer is 0.125-0.175 mm; since the thickness of the patterned resistor film is only tens to hundreds of micrometers, the patterned resistor film is arranged on the PET substrate layer by a magnetron sputtering mode or a screen printing technology to form a resistor film layer.
4. The ultra-thin broadband wave-absorbing metamaterial structure based on the simple resistance surface as set forth in claim 1, wherein the ultra-thin broadband wave-absorbing metamaterial structure is characterized in that: the materials of the first dielectric layer and the third dielectric layer are the same quartz glass and have the same thickness, the relative dielectric constant is 3.6-4.2, the electric loss tangent is 0.001-0.02, and the thickness is 2-3 mm; by selecting the dielectric material with low dielectric constant, the equivalent impedance of the wave-absorbing metamaterial structure is matched with the free space impedance, so that a large amount of electromagnetic waves enter the wave-absorbing metamaterial structure, and the ultra-thin broadband wave-absorbing metamaterial can absorb the electromagnetic waves in a broadband mode.
5. The ultra-thin broadband wave-absorbing metamaterial structure based on the simple resistance surface as set forth in claim 1, wherein the ultra-thin broadband wave-absorbing metamaterial structure is characterized in that: the second dielectric layer is made of PMI foam, the thickness is 2.5-4.0 mm, the relative dielectric constant is 1.1-1.5, and the electrical loss tangent is 0.001-0.01.
6. The ultra-thin broadband wave-absorbing metamaterial structure based on the simple resistance surface as set forth in claim 1, wherein the ultra-thin broadband wave-absorbing metamaterial structure is characterized in that: the metal backboard material is selected from copper or aluminum in conductive metal, and the thickness is 0.1-0.2 mm; the metal backboard can enable the incident electromagnetic wave to be totally reflected, and enable the electromagnetic wave to be reflected, interfered and scattered for multiple times in the wave-absorbing metamaterial structure, so that various modes of loss of the electromagnetic wave can be realized.
7. The ultra-thin broadband wave-absorbing metamaterial structure based on a simple resistive surface as set forth in claim 1, 2, 3, 4, 5 or 6, wherein: the thickness of the ultrathin finger-wave absorbing metamaterial structure is smaller than 10mm; the working frequency range of the broadband finger-wave absorbing metamaterial structure is 3-18 GHz.
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| CN202410159199.6A CN117878619A (en) | 2024-02-04 | 2024-02-04 | Ultrathin broadband wave-absorbing metamaterial structure based on simple resistor surface |
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