CN116613539A - Honeycomb cross-frequency-band broadband wave absorber based on super surface - Google Patents
Honeycomb cross-frequency-band broadband wave absorber based on super surface Download PDFInfo
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- CN116613539A CN116613539A CN202310888225.4A CN202310888225A CN116613539A CN 116613539 A CN116613539 A CN 116613539A CN 202310888225 A CN202310888225 A CN 202310888225A CN 116613539 A CN116613539 A CN 116613539A
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- 239000006096 absorbing agent Substances 0.000 title claims abstract description 57
- 229910052782 aluminium Inorganic materials 0.000 claims description 24
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 24
- 239000004642 Polyimide Substances 0.000 claims description 13
- 229920001721 polyimide Polymers 0.000 claims description 13
- 230000001413 cellular effect Effects 0.000 claims description 11
- 229920000784 Nomex Polymers 0.000 claims description 7
- 239000011248 coating agent Substances 0.000 claims description 7
- 238000000576 coating method Methods 0.000 claims description 7
- 239000004763 nomex Substances 0.000 claims description 7
- 239000000758 substrate Substances 0.000 claims description 7
- 239000000853 adhesive Substances 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 3
- 239000002313 adhesive film Substances 0.000 claims description 2
- 238000005187 foaming Methods 0.000 claims description 2
- 238000010521 absorption reaction Methods 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 3
- 239000011358 absorbing material Substances 0.000 description 24
- 239000004973 liquid crystal related substance Substances 0.000 description 12
- 238000000034 method Methods 0.000 description 10
- 239000000463 material Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000004044 response Effects 0.000 description 1
Classifications
-
- 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
-
- 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
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The application discloses a honeycomb cross-frequency band broadband absorber based on a super surface, which is formed by connecting a plurality of wave absorbing units in an array arrangement, wherein adjacent wave absorbing units are connected to form a hexagonal honeycomb structure. Each wave absorbing unit comprises four three-dimensional half-honeycomb structures and two-dimensional patch super-surface structures glued on the back surfaces of the half-honeycomb structures, the top angles of the four half-honeycomb structures are connected, and the front surfaces of the half-honeycomb structures are open surfaces. The half honeycomb structures on two adjacent wave absorbing units are spliced to form a hexagonal honeycomb structure. According to the application, the impedance characteristic of the absorber is well matched with the free space wave impedance in the cross-frequency-band broadband range by utilizing the super-surface structure, so that the absorber is endowed with better high-frequency electromagnetic absorption characteristic, the absorber can realize the cross-frequency-band broadband wave absorption effect at a lower thickness, and the application of the absorber is facilitated to be light and thin.
Description
Technical Field
The application belongs to the technical field of electromagnetic wave absorption, and particularly relates to a honeycomb type cross-frequency-band broadband wave absorber based on a super surface.
Background
The structural wave absorbing material can bear and absorb waves, and is an important direction of the development of modern stealth technology. The honeycomb wave-absorbing material has strong electrical designability and wide absorption frequency band, and is a main structure wave-absorbing material practically applied in the field of current aviation stealth equipment. Whether the traditional three-dimensional honeycomb material absorber (CN 114591645A) or the two-dimensional honeycomb surface absorber (CN 110190407A) can realize continuous broadband effective electromagnetic absorption, but broadband wave absorption across frequency bands cannot be realized due to the frequency band locality of the impedance characteristic of the absorber. Meanwhile, in consideration of practical engineering applications, the wave absorbing material should make an effective band response to electromagnetic waves at a small thickness. However, the thickness of the honeycomb wave-absorbing material needs to be increased in order to realize broadband wave absorption across frequency bands due to the three-dimensional design characteristics of the honeycomb wave-absorbing material and the wave-absorbing mechanism of multiple reflection attenuation, which makes the honeycomb wave-absorbing material limited in light and thin application of the wave-absorbing material.
Disclosure of Invention
The application provides a honeycomb cross-frequency-band broadband absorber based on a super surface, which utilizes a super surface structure to enable the impedance characteristic of the absorber to realize good matching with free space wave impedance in a cross-frequency-band broadband range, endows the absorber with better high-frequency electromagnetic absorption characteristic, enables the absorber to realize the cross-frequency-band broadband wave absorbing effect at a lower thickness, and is beneficial to the application of thinning the absorber.
The technical scheme for realizing the application is as follows: a honeycomb type cross-frequency-band broadband wave absorber based on a super surface is formed by arranging and connecting a plurality of wave absorbing units in an array, and adjacent wave absorbing units are connected to form a hexagonal honeycomb structure. Each wave absorbing unit comprises four three-dimensional half-honeycomb structures and two-dimensional patch super-surface structures glued on the back surfaces of the half-honeycomb structures, the top angles of the four half-honeycomb structures are connected, and the front surfaces of the half-honeycomb structures are open surfaces. The half honeycomb structures on two adjacent wave absorbing units are spliced to form a hexagonal honeycomb structure.
Compared with the prior art, the application has the remarkable advantages that:
(1) According to the application, a super-surface structure is introduced on the basis of the traditional honeycomb structure, the wave absorbing performance of the traditional honeycomb structure is ensured, and meanwhile, the high-frequency impedance characteristic is optimized, so that the high-frequency broadband wave absorbing performance is improved, and the cross-frequency broadband wave absorbing of the Ku, K, ka and W wave bands is simultaneously covered.
(2) Compared with the traditional honeycomb material wave absorber realizing the same performance, the defect that the traditional wave absorbing honeycomb material needs to increase the thickness of the material to realize cross-band wave absorption is overcome.
Drawings
Fig. 1 is a schematic diagram of a wave absorbing unit structure of a super-surface-based honeycomb cross-band broadband wave absorber of the present application, wherein (a) is a schematic diagram of an overall wave absorbing unit, and (b) is a schematic diagram of a patch super-surface structure of the wave absorbing unit.
Fig. 2 is a schematic diagram of a 3 x 3 array of the ultra-surface based cellular cross-band broadband absorber of the present application.
FIG. 3 shows the equivalent impedance of the ultra-surface-based honeycomb cross-band broadband absorber and the conventional honeycomb material absorber, wherein (a) is 10-50 GHz, and (b) is 90-100 GHz.
Fig. 4 is the equivalent impedance of the inventive metasurface-based honeycomb cross-band broadband absorber when the honeycomb height is 15 mm to a conventional honeycomb material absorber having a height of 20 mm.
Fig. 5 is an S11 graph (the cellular height is 15 mm) of the super-surface-based honeycomb cross-band broadband absorber and the conventional honeycomb material absorber, wherein (a) is 10-50 GHz, and (b) is 90-100 GHz.
Fig. 6 is a graph of the high-band S11 curve of the inventive metasurface-based honeycomb span-band broadband absorber when the honeycomb height is 15 mm and the metasurface-based honeycomb span-band broadband absorber height is 20 mm.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the application. All other embodiments, which can be made by one of ordinary skill in the art without creative efforts, are within the scope of the present application based on the embodiments of the present application.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present application are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
In the description of the present application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined, the "intermediate function" and the "intermediate variable" are used only for simplifying the formula.
In addition, the technical solutions of the embodiments of the present application may be combined with each other, but it is necessary to base that the technical solutions can be implemented by those skilled in the art, and when the technical solutions are contradictory or cannot be implemented, the combination of the technical solutions should be considered to be absent, and not included in the scope of protection claimed in the present application.
The following describes the specific embodiments, technical difficulties and applications of the present application in further detail in connection with the present design examples.
Referring to fig. 1 to 6, the ultra-surface-based honeycomb cross-frequency-band broadband absorber is formed by connecting a plurality of wave absorbing units in an array arrangement, and adjacent wave absorbing units are connected to form a hexagonal honeycomb structure.
Each wave absorbing unit comprises four three-dimensional half honeycomb structures and a two-dimensional patch super-surface structure glued (adhesive film or foaming adhesive is selected) on the back surface of each half honeycomb structure, the top angles of the four half honeycomb structures are connected, and the front surface of each half honeycomb structure is an open surface.
The half honeycomb structures on two adjacent wave absorbing units are spliced to form a hexagonal honeycomb structure.
The hexagonal honeycomb structure is composed of a honeycomb core substrate and a wave-absorbing coating impregnated on the inner walls of the honeycomb.
The honeycomb core substrate is a Nomex honeycomb having a dielectric constant of 1.1.
The real part of the dielectric constant of the wave-absorbing coating is 22.68, and the loss tangent is 0.29.
The patch super-surface structure is composed of a polyimide medium plate, 3X 3 rectangular aluminum patches evaporated on the front surface of the polyimide medium plate and an aluminum plate evaporated on the back surface of the polyimide medium plate.
Equivalent impedance Z of the ultra-surface-based honeycomb cross-frequency-band broadband absorber in The method can be obtained by the formulas (1) to (21).
(1)，
Wherein Z is 1 Is the equivalent impedance of the honeycomb structure, k 0 Electromagnetic wave number epsilon as free space eff And h is the honeycomb height, which is the equivalent dielectric constant of the honeycomb structure.
When electromagnetic waves are perpendicularly incident to the absorber, the reflection loss of the honeycomb structure is only related to the electromagnetic parameters and the height in the vertical direction, and the equivalent dielectric constant epsilon in the vertical direction of the honeycomb structure e The method comprises the following steps:
(2)，
wherein ε d Representing the equivalent dielectric constants of air and the wave-absorbing material, ε b Representing the equivalent dielectric constant, v, of the honeycomb core substrate a V represents the volume ratio of air to the whole wave-absorbing material b Representing the volume ratio of the honeycomb core substrate.
Said epsilon d The method comprises the following steps:
(3)，
wherein ε a Represents the dielectric constant, epsilon, of air c Representing the dielectric constant of the wave-absorbing material，v a1 Representing the volume ratio of air, v c Representing the volume ratio of the wave-absorbing material.
The v is a The method comprises the following steps:
(4)，
wherein w is the wall thickness of the Nomex honeycomb, and a is the cell side length of the Nomex honeycomb.
The v is b The method comprises the following steps:
(5)，
the v is a1 The method comprises the following steps:
(6)，
wherein t is the thickness of the wave-absorbing coating.
The v is c The method comprises the following steps:
(7)，
equivalent impedance Z of polyimide dielectric plate in super surface of patch 2 The method comprises the following steps:
(8)，
wherein Z is 0 Representing free space wave impedance, ε s The dielectric constant of the polyimide dielectric plate is represented by f, the electromagnetic wave frequency is represented by h 1 For the polyimide dielectric plate thickness, c represents the vacuum light velocity, and j represents the imaginary part.
Equivalent impedance Z of the metal layer in the super surface 3 The method comprises the following steps:
(9)，
wherein R represents the equivalent resistance of the rectangular aluminum patch, L represents the equivalent inductance of the rectangular aluminum patch, C represents the equivalent capacitance of the rectangular aluminum patch, and ω represents the angular frequency of electromagnetic waves.
The equivalent resistance R is as follows:
(10)，
wherein sigma is the conductivity of the rectangular aluminum patch and the aluminum plate, h 2 Is rectangular aluminum patch and aluminum plate thickness, p x Is the period of the rectangular aluminum patch in the X direction (horizontal direction in FIG. 1), p y Is the period of the rectangular aluminum patch in the Y direction (vertical direction in fig. 1), m is the length of the rectangular aluminum patch, and n is the width of the rectangular aluminum patch.
The equivalent inductance L is:
(11)，
wherein, the liquid crystal display device comprises a liquid crystal display device,representing a first intermediate function.
(12)，
Wherein, the liquid crystal display device comprises a liquid crystal display device,representing a second intermediate function.
(13)，
Wherein, the liquid crystal display device comprises a liquid crystal display device,represents a first intermediate variable, A x Representing a second intermediateA variable.
(14)，
And, in addition, the processing unit,
(15)，
the equivalent capacitance C is as follows:
(16)，
wherein, the liquid crystal display device comprises a liquid crystal display device,representing a third intermediate function.
(17)，
Wherein, the liquid crystal display device comprises a liquid crystal display device,representing a fourth intermediate function.
(18)，
Wherein, the liquid crystal display device comprises a liquid crystal display device,represents a third intermediate variable, A y Representing a fourth intermediate variable.
(19)，
And, in addition, the processing unit,
(20)，
the equivalent impedance of the honeycomb cross-frequency band broadband absorber based on the super surface is as follows:
(21)。
example 1:
the honeycomb cross-frequency-band broadband absorber based on the super surface disclosed by the application has the advantages that the honeycomb core substrate is Nomex honeycomb, the cell side length of the Nomex honeycomb is a= mm, the wall thickness is w=0.2 mm, and the height is h=15 mm.
The Nomex honeycomb has a dielectric constant of 1.1.
The thickness of the wave-absorbing coating is t=0.2. 0.2 mm.
The real part of the dielectric constant of the wave-absorbing coating is 22.68, and the loss tangent is 0.29.
The polyimide dielectric plate has a real part of dielectric constant of 3 and a loss tangent of 0.03.
The thickness of the polyimide dielectric plate is h 1 = 0.5 mm。
The conductivity of the aluminum patch and the aluminum plate is sigma=3.57×10 7 S/m。
The thickness of the aluminum patch and the aluminum plate is h 2 = 35 um。
The rectangular aluminum patch has a length of m=1.4 mm, a width of n=1.8 mm, and a period p in the X direction x Period p in Y direction of= (1/3) ×3 (1/2) ×a y = a。
The length and width of the aluminum plate are consistent with those of the polyimide dielectric plate.
FIG. 3 shows the calculated equivalent impedance of the ultra-surface based honeycomb cross-band broadband absorber and the conventional honeycomb absorber material in the simulated frequency band. As can be seen from fig. 3, compared with the conventional single honeycomb wave absorbing material, the real part of the equivalent impedance of the honeycomb cross-band broadband wave absorber based on the super surface is closer to 1 in the high frequency band, and the imaginary part is closer to 0, which indicates that the impedance matching property of the honeycomb cross-band broadband wave absorber based on the super surface is better in the high frequency band and free space, thereby being more beneficial to improving reflection attenuation and wave absorbing performance.
Fig. 4 is an equivalent impedance diagram of the super-surface-based honeycomb cross-band broadband absorber when the honeycomb height is 15 mm and the conventional honeycomb wave absorbing material with the height of 20 mm. As can be seen from fig. 4, compared with the conventional honeycomb wave absorbing material with the height of 20 mm, the real part of the equivalent impedance of the super-surface-based honeycomb cross-band broadband wave absorber with the height of only 15 mm is closer to 1, and the imaginary part is closer to 0, which indicates that in the frequency band, the impedance matching degree between the super-surface-based honeycomb cross-band broadband wave absorber with the height of only 15 mm and air is better than that of the conventional honeycomb wave absorbing material with the height of 20 mm, which is more beneficial to improving reflection attenuation and wave absorbing performance.
The reflection attenuation can refer to S11 of the simulation calculation.
The reflection characteristics of the honeycomb cross-frequency band broadband absorber based on the super surface in two frequency bands (namely 10-50 GHz and 90-100 GHz) are simulated and calculated by adopting a frequency domain finite element method, and the result is shown in figure 5.
As can be seen from FIG. 5, in the frequency range of 15.2-50 GHz of the low frequency band, S11 of the conventional honeycomb wave absorbing material and the super-surface-based honeycomb cross-frequency band broadband wave absorber are smaller than-10 dB, so that effective reflection attenuation is realized. In the high frequency band, the traditional honeycomb wave absorbing material is difficult to realize continuous effective reflection attenuation, S11 is larger than-10 dB in partial frequency band, and the super-surface-based honeycomb cross-frequency band broadband wave absorber is lower than-10 dB in the whole W wave band, and the reflection attenuation peak value is-77 dB. Therefore, compared with the traditional honeycomb wave absorbing material, the high-frequency reflection attenuation performance of the ultra-surface-based honeycomb cross-frequency-band broadband wave absorber is greatly improved, the cross-frequency-band broadband wave absorbing effect is achieved, and the result is consistent with that of fig. 3.
The simulation calculation was performed on S11 of the conventional honeycomb wave-absorbing material with a height of 20. 20 mm, and the comparison was made with S11 of the super-surface-based honeycomb cross-band broadband wave absorber with a thickness of 15.5 mm (in which the honeycomb height is 15 mm), and the result is shown in fig. 6.
As can be seen from fig. 6, when the thickness of the conventional honeycomb wave absorbing material is increased from 15 mm to 20 mm in fig. 5, the reflection attenuation of the conventional honeycomb wave absorbing material is higher in the range of 97.3-99.1 GHz than that of the ultra-surface-based honeycomb cross-band broadband wave absorber with the honeycomb height of 15 mm, and the reflection is opposite in other frequency ranges of the W-band, which is consistent with the result of fig. 4. Therefore, compared with the traditional honeycomb wave-absorbing material, the super-surface-based honeycomb cross-frequency-band broadband wave absorber provided by the application can effectively reduce the height of a honeycomb structure, and provides a feasible path for the light and thin application of the broadband honeycomb wave-absorbing material.
The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the present application. It should be noted that: any modification and variation made within the spirit and principles of the present application should be considered to be within the scope of the present application.
The foregoing embodiments have been provided for the purpose of illustrating the general principles of the present application in further detail, and are not to be construed as limiting the scope of the application, but are merely intended to cover any modifications, equivalents, improvements, etc. based on the teachings of the application.
Claims (10)
1. A honeycomb cross-frequency-band broadband absorber based on a super surface is characterized in that: the wave absorbing device is formed by arranging and connecting a plurality of wave absorbing units in an array, and adjacent wave absorbing units are connected to form a hexagonal honeycomb structure;
each wave absorbing unit comprises four three-dimensional half-honeycomb structures and two-dimensional patch super-surface structures glued on the back surfaces of the half-honeycomb structures;
the top angles of the four half-honeycomb structures are connected, and the front surface of the half-honeycomb structure is an open surface.
2. The ultra-surface based cellular cross-band broadband absorber of claim 1, wherein: the half honeycomb structures on two adjacent wave absorbing units are spliced to form a hexagonal honeycomb structure.
3. The super-surface based cellular cross-band broadband absorber according to claim 1 or 2, wherein: the hexagonal honeycomb structure is composed of a honeycomb core substrate and a wave-absorbing coating impregnated on the inner walls of the honeycomb.
4. A super-surface based cellular cross-band broadband absorber according to claim 3, wherein: the honeycomb core substrate was a Nomex honeycomb having a dielectric constant of 1.1.
5. A super-surface based cellular cross-band broadband absorber according to claim 3, wherein: the real part of the dielectric constant of the wave-absorbing coating is 22.68, and the loss tangent is 0.29.
6. A super-surface based cellular cross-band broadband absorber according to claim 3, wherein: the patch super-surface structure consists of a polyimide dielectric plate, a plurality of rectangular aluminum patches evaporated on the front surface of the polyimide dielectric plate and an aluminum plate evaporated on the back surface of the polyimide dielectric plate.
7. The ultra-surface based cellular cross-band broadband absorber of claim 6, wherein: a plurality of rectangular aluminum patches in a single wave-absorbing unit are distributed and arranged in a 3×3 form.
8. The ultra-surface based cellular cross-band broadband absorber of claim 6, wherein: the polyimide dielectric plate had a real part of dielectric constant of 3 and a loss tangent of 0.03.
9. The ultra-surface based cellular cross-band broadband absorber of claim 6, wherein: the conductivity of the aluminum patch and the aluminum plate was 3.57×10 7 S/m。
10. The ultra-surface based cellular cross-band broadband absorber of claim 1, wherein: the adhesive joint of the super surface structure and the honeycomb structure is made of adhesive film or foaming adhesive.
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