CN113032951B - Broadband transparent wave absorber based on genetic algorithm design optimization and design method thereof - Google Patents
Broadband transparent wave absorber based on genetic algorithm design optimization and design method thereof Download PDFInfo
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Abstract
The invention discloses a broadband transparent wave absorber based on genetic algorithm design optimization and a design method thereof. The broadband transparent wave absorber comprises a transparent conductive film and a dielectric layer, the transparent conductive film comprises a bottom low-impedance conductive film layer (1), a middle patterned conductive film layer (2) and an upper patterned conductive film layer (3), the dielectric layer I is arranged between the bottom low-impedance conductive film layer (1) and the middle patterned conductive film layer (2), the dielectric layer II is arranged between the middle patterned conductive film layer (2) and the upper patterned conductive film layer (3), and the dielectric layer I and the dielectric layer II are both air dielectrics; the broadband transparent wave absorbers are periodically arranged on the two-dimensional plane to form a chessboard, and the broadband transparent wave absorbers are uniformly arranged on the two-dimensional plane along the horizontal direction and the vertical direction. The invention solves the problems of broadband absorption and low profile of the wave absorber, and designs complementary resonance patterns and structural parameters by using a genetic algorithm, thereby realizing the metamaterial wave absorber.
Description
Technical Field
The invention belongs to the field of wave absorbers; in particular to a broadband transparent wave absorber designed and optimized based on a genetic algorithm and a design method thereof.
Background
In the military field, the microwave band metamaterial is applied to equipment with stealth requirements such as fighters and the like in recent years, the microwave band of a machine body is stealthed, and the visible light transparent microwave band of a cabin cover is stealthed. The fields of civil fields, electromagnetic compatibility fields, microwave darkroom optical windows and the like have great requirements on wave absorber metamaterials.
The Salisbury screen reflection characteristic research proposed in 1988 since the resistance film layer is used for regulating and controlling the absorption of electromagnetic waves. A study of the Jaumann screen absorber in 1990. Both absorbers can achieve extremely high absorption over a narrow frequency band. However, in the face of the new times of requirements of 'light, thin, high optical transmittance, wide coverage frequency range and strong absorption capacity' of the absorber, the traditional absorber is difficult to meet.
Metamaterials are a class of man-made materials with special properties, the electromagnetic properties of which depend on their own artificial structure. Compared with the traditional microwave absorber, the metamaterial can better combine with actual requirements, and designs a used medium and an artificial structure, so that a wider frequency band, a smaller section and higher optical transmittance are realized.
The design key of the metamaterial wave absorber is the artificial structure, and the performance of the wave absorber is determined by the advantages and disadvantages of the artificial structure design. The existing wave absorber design theory, such as an analog circuit method, and an equivalent medium method have certain explanation for simple resonance patterns. However, simple resonant patterns have some limitations in terms of broadband and low profile, and complex resonant patterns have more excellent performance in both aspects. There is no direct correspondence between complex patterns and performance. It is difficult to rapidly propose a resonance pattern in response to a demand.
Disclosure of Invention
The invention provides a broadband transparent wave absorber based on genetic algorithm design optimization and a design method thereof, which solve the problems of broadband absorption and low profile of the wave absorber; and (3) designing a complementary artificial resonance pattern by utilizing a genetic algorithm, thereby quickly realizing the design of the metamaterial wave absorber.
The invention is realized by the following technical scheme:
a broadband transparent wave absorber designed and optimized based on genetic algorithm comprises a transparent conductive film and a dielectric layer, wherein the transparent conductive film comprises a bottom low-impedance conductive film layer 1, a middle patterned conductive film layer 2 and an upper patterned conductive film layer 3, the dielectric layer I is arranged between the bottom low-impedance conductive film layer 1 and the middle patterned conductive film layer 2, the dielectric layer II is arranged between the middle patterned conductive film layer 2 and the upper patterned conductive film layer 3, and the dielectric layer I and the dielectric layer II are air dielectrics;
the broadband transparent wave absorbers are periodically arranged on the two-dimensional plane to form a chessboard, and the broadband transparent wave absorbers are uniformly arranged on the two-dimensional plane along the horizontal direction and the vertical direction.
Furthermore, the plurality of broadband transparent wave absorbers are arranged in M multiplied by N periods on a two-dimensional plane, and M and N are non-zero positive integers.
Furthermore, each row in the horizontal direction of the periodic arrangement is larger than m broadband transparent wave absorbers, and the vertical direction of the periodic arrangement is larger than n broadband transparent wave absorbers.
A design method of a broadband transparent wave absorber based on genetic algorithm design optimization comprises the following steps:
step 1: establishing an electromagnetic simulation model of a wave absorber in electromagnetic simulation software;
step 2: inputting the range of the parameters of the wave absorber structure in electromagnetic simulation software;
and step 3: randomly sampling the parameters in the step 2 to generate initial individuals, namely parameters corresponding to the individuals;
and 4, step 4: importing the individual parameters generated in the step 3 into electromagnetic simulation software and running the individual parameters;
and 5: s parameters of the current generation of individuals are obtained in the simulation operated in the step 4, and are imported into a fitness function to obtain an adaptive value of the current generation of individuals;
step 6: judging whether the adaptive value in the step 5 meets the requirement, if so, performing a step 8, and if not, performing a step 7;
and 7: using the adaptive value to perform selection operation, cross operation and variation operation on the individuals of the current generation to generate the range of the input parameters of the individuals of the next generation, and returning to the step 4;
and 8: and finishing the design to obtain the complementary patterned wave absorber structures of the upper layer and the middle layer.
Further, initializing that the basic coefficient of the genetic algorithm comprises the number of individuals of each generation, optimizing the elements of the design unit, and outputting the fitness function of the evaluation function; the expression using the function is:
Best(Fitness(x pattern ,x parameter ))＝Gene(x base ,x pattern ,x parameter )
wherein, best () is selected optimal data, fitness () is a Fitness function, gene () is a genetic algorithm, and x base Being a basic parameter of the genetic algorithm, x pattern Is a pattern element, x parameter Are parameter elements.
Further, initializing the input genetic algorithm, the number of individuals per generation x base Inputting pattern element x pattern And a parameter element x parameter A corresponding range; selecting and generating primary individuals among the ranges by utilizing random sampling; and simulating the initialized pattern elements and the parameter elements to obtain S parameters, and inputting the S parameters into the fitness function to obtain a fitness value.
Further, a pattern element x pattern The pixel parameters of the design pattern are referred, wherein the number of independent pixels of the initial design area is m × m, and the rest parts are formed by symmetrically rotating the initial design area along the center of the unit; the parameter corresponding to each pixel is set to be 0 or 1, and respectively represents that no conductive coating or a conductive coating exists at the position of the pixel; the upper layer and the middle layer are of complementary structures, if the first pixel of the upper layer selects 0, the first pixel of the middle layer selects 1, and if the first pixel of the upper layer selects 1, the first pixel of the middle layer selects 0.
Further, the parameter element x parameter Physical parameters including design elements; the unit comprises a unit with side length of x1mm, an upper air cavity with thickness of x2mm, a lower air cavity with thickness of x3mm, and an upper and middle transparent conductive film with surface resistance of x4 (omega/\9633;); wherein the surface resistances of the upper layer and the middle layer are selected to be consistent, the upper layer and the middle layer are positioned at the same pixel position, and only one conductive coating exists; the range of the side length x1 of the unit is 9-20mm, the ranges of the thicknesses x2 and x3 of the air cavity are 1-5mm, and the range of the sheet resistance x4 of the transparent conductive film of the upper layer and the middle layer is 40-200 omega/\9633.
Furthermore, the fitness function is designed to be the relative bandwidth corresponding to the frequency range of which the absorptivity is greater than 0.9 or 0.95; wherein the formula for the absorbance is defined as:
A＝1-|S11| 2 -|S21| 2
wherein S11 is a reflectance and S21 is a transmittance
The relative bandwidth formula is defined as:
ffoc＝2×(fH-fL)/(fH+fL)
where ffoc represents the relative bandwidth, fH represents the highest frequency of the entire frequency band for which the absorption rate is greater than 0.9, and fL represents the lowest frequency of the entire frequency band for which the absorption rate is greater than 0.9.
Further, the metamaterial wave absorber design unit has the following elements:
x pattern ＝[0,0,0,1,0,0,0,1,1,0,0,0,1,1,0,1,0,0,0,1,0,0,1,1,1]；
x parameter ＝[x1,x2,x3,x4]＝[18,3.5,2.5,150]；
the metamaterial wave absorbers correspond to the units; the electromagnetic waves with different polarizations can have the absorption rate of more than 0.9 in the frequency range of 6-36 GHz; the electromagnetic waves with different incident angles can have the absorptivity of more than 0.9 within the incident angle of 50 degrees in the frequency range of 6-36GHz, and the thickness is 6.37mm.
The beneficial effects of the invention are:
1 by the method, the ultra-broadband transparent wave absorber can be designed, and the structure is difficult to obtain by manpower design or in a short time.
2 the absorber obtained by this method can absorb various polarized plane waves when they are incident.
3 the wave absorber obtained by the method has good visual field impression and higher optical transmittance.
Drawings
FIG. 1 is a schematic diagram of the cell structure of the present invention.
FIG. 2 is a schematic diagram of the array structure of the present invention.
Fig. 3 is a schematic view of a transparent mesh medium supporting a conductive film layer according to the present invention.
Fig. 4 is a schematic diagram of the normal incidence absorbance of the present invention.
Fig. 5 is a schematic diagram of the oblique incidence absorption of the present invention.
FIG. 6 is a schematic diagram of different polarization absorptance of the present invention.
Fig. 7 is a schematic diagram of the absorption rate of the present invention, where (a) is an independent pixel 2 × 2 period arrangement i, (b) is an independent pixel 2 × 2 period arrangement ii, (c) is an independent pixel 3 × 3 period arrangement i, (d) is an independent pixel 3 × 3 period arrangement ii, (e) is an independent pixel 4 × 4 period arrangement i, (f) is an independent pixel 4 × 4 period arrangement ii, (g) is an independent pixel 8 × 8 period arrangement, and (h) is an independent pixel 10 × 10 period arrangement.
Fig. 8 is a schematic view of an embodiment of the present invention, in which (a) the upper layer i is arranged in 2 × 2 cycles for individual pixels, (b) the upper layer ii is arranged in 2 × 2 cycles for individual pixels, (c) the upper layer i is arranged in 3 × 3 cycles for individual pixels, (d) the upper layer ii is arranged in 3 × 3 cycles for individual pixels, (e) the upper layer i is arranged in 4 × 4 cycles for individual pixels, (f) the upper layer ii is arranged in 4 × 4 cycles for individual pixels, (g) the upper layer i is arranged in 8 × 8 cycles for individual pixels, and (h) the upper layer i is arranged in 10 × 10 cycles for individual pixels.
Detailed Description
The technical solutions in the embodiments of the present invention will be described below clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
As shown in fig. 1-6, a broadband transparent wave absorber designed and optimized based on genetic algorithm comprises a transparent conductive film and a dielectric layer, wherein the transparent conductive film comprises a bottom low-impedance conductive film layer 1, a middle patterned conductive film layer 2 and an upper patterned conductive film layer 3, the dielectric layer i is arranged between the bottom low-impedance conductive film layer 1 and the middle patterned conductive film layer 2, the dielectric layer ii is arranged between the middle patterned conductive film layer 2 and the upper patterned conductive film layer 3, and both the dielectric layer i and the dielectric layer ii are air media;
the broadband transparent wave absorbers are periodically arranged on the two-dimensional plane to form a chessboard, and the broadband transparent wave absorbers are uniformly arranged on the two-dimensional plane along the horizontal direction and the vertical direction.
Furthermore, the plurality of broadband transparent wave absorbers are arranged in M multiplied by N periods on a two-dimensional plane, and M and N are non-zero positive integers.
Furthermore, each row in the horizontal direction of the periodic arrangement is larger than m broadband transparent wave absorbers, and the vertical direction of the periodic arrangement is larger than n broadband transparent wave absorbers.
A design method of a broadband transparent wave absorber based on genetic algorithm design optimization comprises the following steps:
step 1: establishing an electromagnetic simulation model of a wave absorber in electromagnetic simulation software;
and 2, step: inputting the range of the parameters of the wave absorber structure in electromagnetic simulation software;
and step 3: randomly sampling the parameters in the step 2 to generate initial individuals, namely parameters corresponding to the individuals;
and 4, step 4: importing the individual parameters generated in the step 3 into electromagnetic simulation software and running the individual parameters;
and 5: s parameters of the current generation of individuals are obtained in the simulation operated in the step 4, and are imported into a fitness function to obtain an adaptive value of the current generation of individuals;
step 6: judging whether the adaptive value in the step 5 meets the requirement, if so, performing a step 8, and if not, performing a step 7;
and 7: using the adaptive value to perform selection operation, cross operation and variation operation on the individuals of the current generation to generate the range of the input parameters of the individuals of the next generation, and returning to the step 4;
and step 8: and finishing the design to obtain the complementary patterned wave absorber structures of the upper layer and the middle layer.
Further, initializing that the basic coefficient of the genetic algorithm comprises the number of individuals of each generation, optimizing the elements of the design unit, and outputting the fitness function of the evaluation function; the expression using the function is:
Best(Fitness(x pattern ,x parameter ))＝Gene(x base ,x pattern ,x parameter )
wherein Best () is the selected optimal data, fitness () is the Fitness function, gene () is the genetic algorithm, x base Being a basic parameter of the genetic algorithm, x pattern Is a pattern element, x parameter Are parameter elements.
Further, the input genetic algorithm is initialized, and the number x of individuals of each generation base Inputting pattern element x pattern And parameter element x parameter A corresponding range; selecting and generating an initial generation individual between ranges by utilizing random sampling; and simulating the initialized pattern elements and the parameter elements to obtain S parameters, and inputting the S parameters into the fitness function to obtain a fitness value.
Further, a pattern element x pattern The pixel parameters of the design pattern are referred, wherein the number of independent pixels of the initial design area is m × m, and the rest parts are formed by symmetrically rotating the initial design area along the center of the unit; the same absorption effect of different polarized incidence is ensured; the parameter corresponding to each pixel is set to be 0 or 1, and the parameter respectively represents that no conductive coating or a conductive coating exists at the position of the pixel; the upper layer and the middle layer are of complementary structures, if the first pixel of the upper layer selects 0, the first pixel of the middle layer selects 1, and if the first pixel of the upper layer selects 1, the first pixel of the middle layer selects 0; the complementary structure makes the optical transmittance of the wave absorber keep consistent from the normal direction and the observation of a small angle.
Further, the parameter element x parameter Physical parameters including design elements; the unit comprises a unit with side length of x1mm, an upper air cavity with thickness of x2mm, a lower air cavity with thickness of x3mm, and an upper and middle transparent conductive film with surface resistance of x4 (omega/\9633;); the surface resistances of the upper layer and the middle layer are selected to be consistent, the upper layer and the middle layer are positioned at the same pixel position, and only one conductive coating exists, so that the optical transmittance of all the parts is ensured to be consistent, and the visual field of a person is good; the side length x1 of the unit is 9-20mm, and the air cavity thickness x2 and x3 are 1-5mmThe surface resistance x4 of the conductive film is selected to be 40-200 omega/\9633.
Furthermore, the fitness function is designed to be a relative bandwidth corresponding to a frequency range with the absorptivity greater than 0.9 or 0.95; wherein the formula for the absorbance is defined as:
A＝1-|S11| 2 -|S21| 2
wherein S11 is a reflectivity, and S21 is a transmittance;
the relative bandwidth formula is defined as:
ffoc＝2×(fH-fL)/(fH+fL)
where ffoc represents the relative bandwidth, fH represents the highest frequency of the entire frequency band for which the absorption rate is greater than 0.9, and fL represents the lowest frequency of the entire frequency band for which the absorption rate is greater than 0.9.
Further, the design unit of the metamaterial wave absorber comprises
x pattern ＝[0,0,0,1,0,0,0,1,1,0,0,0,1,1,0,1,0,0,0,1,0,0,1,1,1]；
x parameter ＝[x1,x2,x3,x4]＝[18,3.5,2.5,150]；
The metamaterial wave absorbers corresponding to the unit have good absorption effects on electromagnetic waves with different polarizations and electromagnetic waves incident at different angles; the electromagnetic waves with different polarizations can have high absorptivity of more than 0.9 within the frequency range of 6-36 GHz; the electromagnetic waves with different incident angles have high absorptivity of more than 0.9 within 50 degrees of the incident angle and within the frequency range of 6-36GHz, and the thickness is 6.37mm, so that the low profile is realized.
And the complementary graphical conductive film layers of the upper layer and the middle layer adopt a genetic algorithm or other local search algorithms to call electromagnetic simulation software to determine whether the conductive coating is filled in the pixel position and key parameters of the unit, so that the resonance pattern is obtained.
The fitness function adopted by the genetic algorithm is a relative bandwidth of a corresponding frequency band with the absorptivity higher than 0.9 or 0.95.
The manufacturing method of the patterned resistive film is to etch the resistive film through laser or screen print the resistive film. The resistance film is generally transparent conductive film such as ITO film, silver nanowire film, copper mesh grid film, etc., and the thickness is 0.01-0.02 mm.
The middle air dielectric layer is realized by attaching a conductive film layer on the transparent grid. The side length of the transparent grid is generally 5-7 unit periods, and the grid width w1 is less than 1 cm.
The height of the upper air cavity x2 is 2-4mm, and the height of the lower air cavity x3 is 2-4mm.
The surface resistance of the middle resistive film is consistent with that of the upper resistive film, the surface resistance is 150-200 omega/\9633, and the surface resistance of the lower resistive film is generally less than 10 omega/\9633.
Example 2
As shown in fig. 1, 2 and 3, the metamaterial wave absorber structure of the invention comprises (1) a low-impedance conductive film layer at the bottom, (2) a patterned conductive film layer at the middle layer, and (3) a patterned conductive film layer at the upper layer. The wave absorber size parameters comprise the side length of the x1 unit, the thickness of the x2 upper-layer air cavity and the thickness of the x3 lower-layer air cavity. The absorber elements are combined into a 10 x 10 rectangular matrix and the conductive film layer is attached to the transparent grid medium as shown in fig. 2. The width of the transparent mesh medium in fig. 3 is w1.
Firstly, establishing a wave absorber unit electromagnetic simulation model in electromagnetic simulation software, and inputting physical parameters of a wave absorber. The film used in the invention is a PET-ITO conductive film layer. The dielectric constant of PET was set to 2.65, the loss tangent was set to 0.015, and the thickness of the PET film was set to 0.012mm. Setting the surface resistance of the bottom layer conductive film layer to 6 omega/9633and setting parameter element x parameter The side length x1 of the unit, the thickness x2 of the upper layer air cavity, the thickness x3 of the lower layer air cavity and the surface resistance x4 of the transparent conductive film of the upper layer and the middle layer are variables. In the electromagnetic simulation model, only the upper layer and the middle layer of PET substrate and the bottom layer of low-impedance transparent conductive film are arranged. The patterns of the upper layer and the middle layer are filled by a program.
Inputting the number x of individuals evolved by each generation of genetic algorithm in a program written by python base And optional ranges for x1, x2, x3, x 4. Running a program to initialize a first generation simulated pattern element x within a variable selection range using random sampling pattern And parameter element x parameter . Using electromagnetic simulation in programsAnd the software interface is used for establishing a pattern model in the electromagnetic simulation software, importing an initial value of a variable and simulating.
The simulation software can directly obtain the S parameter of the wave absorber, and the post-processing program converts the S parameter into a value of a required fitness function through a formula. Through the value of the fitness function, the individual of the current generation is subjected to selection, intersection and variation operation to generate the pattern element x of the next generation pattern And parameter element x parameter And then, the data is imported into electromagnetic simulation software, and the subsequent cycle is started.
And when the value of the fitness function meets the requirement, the genetic algorithm stops running. And obtaining pattern elements and parameter elements corresponding to the wave absorber with the maximum relative bandwidth. And the designed broadband wave absorber unit is obtained by using the broadband wave absorber. The cells are arranged in a matrix and etched on a uniform conductive film layer. The film was attached to a transparent grid to make a sample.
The simulation results of the absorption cell obtained are shown in fig. 4, 5 and 6. The absorptivity reaches 0.99 at 9.28GHz and 31.33GHz, the absorption is higher than 0.9 frequency band to cover 6-36GHz, and the relative bandwidth is 1.42. Within less than 50 DEG of oblique incidence, an absorption capacity of more than 0.9 in the frequency band range is still ensured. When electromagnetic waves with different polarizations are incident, the absorption capacity of the wave absorber provided by the invention is not affected.
TABLE 1
Table 1 corresponds to fig. 7 (a) (b), fig. 8 (a) and (b);
TABLE 2
Table 2 corresponds to fig. 7 (c) (d), fig. 8 (c) and (d);
TABLE 3
Table 3 corresponds to fig. 7 (e) (f), fig. 8 (e) and (f);
fig. 7 (g) corresponds to fig. 8 (g).
Fig. 7 (h) corresponds to fig. 8 (h).
Claims (7)
1. A design method of a broadband transparent wave absorber based on genetic algorithm design optimization is characterized by comprising the following steps:
step 1: establishing an electromagnetic simulation model of a wave absorber in electromagnetic simulation software;
step 2: inputting the range of the parameters of the wave absorber structure in electromagnetic simulation software;
and step 3: randomly sampling the parameters in the step 2 to generate initial individuals, namely parameters corresponding to the individuals;
and 4, step 4: importing the individual parameters generated in the step 3 into electromagnetic simulation software and running the individual parameters;
and 5: s parameters of the current generation of individuals are obtained in the simulation operated in the step 4, and are imported into a fitness function to obtain an adaptive value of the current generation of individuals;
step 6: judging whether the adaptive value in the step 5 meets the requirement, if so, performing a step 8, and if not, performing a step 7;
and 7: using the adaptive value to perform selection operation, cross operation and variation operation on the individuals of the current generation to generate the range of the input parameters of the individuals of the next generation, and returning to the step 4;
and step 8: finishing the design to obtain the complementary graphical wave absorber structures of the upper layer and the middle layer;
initializing basic coefficients of a genetic algorithm including the number of individuals of each generation, optimizing elements of a design unit, and outputting a fitness function of an evaluation function; the expression using the function is:
Best(Fitness(x pattern ,x parameter ))＝Gene(x base ,x pattern ,x parameter )
wherein Best () is to select the optimal data,fitness () is the Fitness function, gene () is the genetic algorithm, x base Being a basic parameter of the genetic algorithm, x pattern Is a pattern element, x parameter Is a parameter element;
initializing the input genetic algorithm, number of individuals per generation x base Inputting pattern element x pattern And a parameter element x parameter A corresponding range; selecting and generating an initial generation individual between ranges by utilizing random sampling; simulating the initialized pattern elements and the parameter elements to obtain S parameters, and inputting the S parameters into a fitness function to obtain a fitness value;
pattern element x pattern The pixel parameters of the design pattern are referred, wherein the number of independent pixels of the initial design area is m × m, and the rest parts are formed by symmetrically rotating the initial design area along the center of the unit; the parameter corresponding to each pixel is set to be 0 or 1, and the parameter respectively represents that no conductive coating or a conductive coating exists at the position of the pixel; the upper layer and the middle layer are of complementary structures, if the first pixel of the upper layer selects 0, the first pixel of the middle layer selects 1, and if the first pixel of the upper layer selects 1, the first pixel of the middle layer selects 0.
2. The method as claimed in claim 1, wherein the parameter element x is a parameter element of the broadband transparent absorber design optimized based on genetic algorithm parameter Including physical parameters of the design element; the unit comprises a unit with a side length of x1mm, an upper air cavity with a thickness of x2mm, a lower air cavity with a thickness of x3mm, and an upper and middle transparent conductive film with a sheet resistance of x4 (omega/\9633; etc.); wherein the surface resistances of the upper layer and the middle layer are selected to be consistent, the upper layer and the middle layer are positioned at the same pixel position, and only one conductive coating exists; the side length x1 of the unit is 9-20mm, the thickness x2 and x3 of the air cavity are 1-5mm, and the sheet resistance x4 of the transparent conductive film of the upper layer and the middle layer is 40-200 omega/\9633.
3. The design method of the broadband transparent absorber based on genetic algorithm design optimization according to claim 1, wherein the fitness function is designed to have a relative bandwidth corresponding to a frequency range with an absorption rate greater than 0.9 or 0.95;
wherein the formula for the absorbance is defined as:
A＝1-|S11| 2 -|S21| 2
wherein S11 is a reflectance and S21 is a transmittance
The relative bandwidth formula is defined as:
ffoc＝2×(fH-fL)/(fH+fL)
where ffoc represents the relative bandwidth, fH represents the highest frequency of the entire frequency band with an absorption rate greater than 0.9, and fL represents the lowest frequency of the entire frequency band with an absorption rate greater than 0.9.
4. The method for designing the broadband transparent absorber based on genetic algorithm design optimization according to claim 1, wherein the metamaterial absorber design unit comprises:
x pattern ＝[0,0,0,1,0,0,0,1,1,0,0,0,1,1,0,1,0,0,0,1,0,0,1,1,1]；
x parameter ＝[x1,x2,x3,x4]＝[18,3.5,2.5,150]；
the metamaterial wave absorbers correspond to the units; the electromagnetic waves with different polarizations can have the absorption rate of more than 0.9 in the frequency range of 6-36 GHz; the electromagnetic waves with different incident angles can have the absorptivity of more than 0.9 within the incident angle of 50 degrees in the frequency range of 6-36GHz, and the thickness is 6.37mm.
5. The design method of the broadband transparent wave absorber designed and optimized based on the genetic algorithm as claimed in claim 1, wherein the complementary patterned wave absorber structure of the upper layer and the middle layer obtained in step 8 is specifically that the broadband transparent wave absorber comprises a transparent conductive film and a dielectric layer, the transparent conductive film comprises a bottom low-impedance conductive film layer (1), a middle patterned conductive film layer (2) and an upper patterned conductive film layer (3), a dielectric layer i is arranged between the bottom low-impedance conductive film layer (1) and the middle patterned conductive film layer (2), a dielectric layer ii is arranged between the middle patterned conductive film layer (2) and the upper patterned conductive film layer (3), and the dielectric layer i and the dielectric layer ii are air dielectrics;
the broadband transparent wave absorbers are periodically arranged on the two-dimensional plane to form a chessboard, and the broadband transparent wave absorbers are uniformly arranged on the two-dimensional plane along the horizontal direction and the vertical direction.
6. The method as claimed in claim 5, wherein the broadband transparent wave absorber is arranged in M × N periods on a two-dimensional plane, and M and N are non-zero positive integers.
7. The method according to claim 5, wherein the number of the periodically arranged horizontal rows is greater than m, and the number of the periodically arranged vertical rows is greater than n.
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| CN208128766U (en) * | 2018-05-10 | 2018-11-20 | 西安海辰兴新材料科技有限公司 | A kind of transparent wave absorbing device of ultra wide band based on electric-heating technology |
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| CN109740238B (en) * | 2018-12-28 | 2022-05-24 | 哈尔滨工业大学 | Topological optimization-based structural optimization method of broadband metamaterial wave absorber and preparation method thereof |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2002076671A (en) * | 2000-08-31 | 2002-03-15 | Takenaka Komuten Co Ltd | Electromagnetic wave absorber and method for absorbing electromagnetic wave |
| CN208128766U (en) * | 2018-05-10 | 2018-11-20 | 西安海辰兴新材料科技有限公司 | A kind of transparent wave absorbing device of ultra wide band based on electric-heating technology |
Non-Patent Citations (2)
| Title |
|---|
| Dendritic wideband metamaterial absorber based on resistance film;Bing Wang et al.;《Applied Physics 》;20130430;第118卷(第4期);1559-1563 * |
| 基于电磁谐振分离的宽带低雷达截面超材料吸波体;杨欢欢 等;《物理学报》;20161116;第62卷(第21期);134-141 * |
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