CN112713411A - Broadband high-transparency diffuse reflection super surface - Google Patents
Broadband high-transparency diffuse reflection super surface Download PDFInfo
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- CN112713411A CN112713411A CN202011599916.5A CN202011599916A CN112713411A CN 112713411 A CN112713411 A CN 112713411A CN 202011599916 A CN202011599916 A CN 202011599916A CN 112713411 A CN112713411 A CN 112713411A
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- 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
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- 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
- H01Q15/14—Reflecting surfaces; Equivalent structures
Abstract
The invention discloses a broadband high-transparency diffuse reflection super surface which comprises a transparent dielectric plate, a coding unit and a grid, wherein a first coding subunit and a second coding subunit printed on the first surface of the transparent dielectric plate are both annular patches, the line width of a circular ring is far smaller than the size of the whole structure, and a grid structure is printed on the second surface opposite to the first surface.
Description
Technical Field
The invention relates to the technical field of artificial electromagnetic materials, in particular to a broadband high-transparency diffuse reflection super surface.
Background
The super surface is a two-dimensional artificial electromagnetic metamaterial with anisotropic quasi-period on a sub-wavelength scale, and the state of electromagnetic waves can be flexibly adjusted by designing the structure of a sub-wavelength unit and adjusting the arrangement mode of the sub-wavelength unit in space, for example, the free regulation and control of the reflection or transmission amplitude and phase of the electromagnetic waves and the free conversion of a polarization mode are realized; common electromagnetic super surfaces mainly comprise a frequency selective surface, an electromagnetic band gap structure, a metamaterial wave absorber, a phase gradient super surface, a diffuse reflection super surface and the like. The diffuse reflection super surface randomly distributes the scattered electromagnetic wave energy to each scattering direction by means of random reflection phase distribution of the diffuse reflection super surface so as to have no obvious scattering main lobe, and when the diffuse reflection super surface is applied to transparent parts such as a cockpit, instruments and meters and the like with the requirement of an optical window, high requirements are provided for RCS reduction and transparency of a diffuse reflection super surface structure.
The existing diffuse reflection super-surface unit adopts a low duty ratio structure, so that the transparency is low; the existing super surface adopts transparent conductive Indium Tin Oxide (ITO) square and round patterns to replace traditional opaque metal patterns, and certain random optimization arrangement is carried out on units formed by the two patterns, so that the super surface with the optimal scattering effect is obtained, and the radar scattering cross section reduction of more than 10dB is realized in a 7.8GHz-15GHz wave band. However, in order to achieve a high shielding effect of the super-surface, ITO having high conductivity is used, but the higher the conductivity is, the lower the transparency of ITO is, and there is a problem that the transparency of the entire diffuse reflection super-surface is significantly reduced.
Disclosure of Invention
Therefore, the broadband high-transparency diffuse reflection super surface provided by the invention overcomes the defect that the transparency of the whole diffuse reflection super surface is obviously reduced in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme:
in a first aspect, embodiments of the present invention provide a broadband high-transparency diffuse reflection super surface, comprising a transparent dielectric plate, a coding unit, and a grid, wherein,
the first surface of the transparent dielectric plate is printed with M multiplied by N coding units which are periodically arranged, M is more than or equal to 2, N is more than or equal to 2, and a second surface opposite to the first surface is printed with a grid;
the coding unit comprises KxK coding subunits which are periodically arranged, and K is more than or equal to 2; the encoding sub-unit includes: the first coding subunit and the second coding subunit determine the number and the positions of the first coding subunit and the second coding subunit on the first surface of the transparent dielectric slab through the optimal coding sequence;
the coding subunit comprises four half small circular rings, four three-quarter large circular rings and patches which are equal in width, wherein the small circular rings and the large circular rings are alternately connected through the patches to form a closed loop, and the radius of each large circular ring and the radius of each small circular ring are related to the length of each patch.
In one embodiment, the structure of the mesh grid is composed of regular hexagonal patches.
In an embodiment, the first encoding subunit and the second encoding subunit have dimensions corresponding to the amplitudes of the reflection characteristics of the two encoding subunits, with a phase difference of 180 ° ± 30 °.
In an embodiment, the first coding subunit and the second coding subunit are both composed of large rings and small rings with different radii.
In one embodiment, in the M × N coding units arranged periodically, the first coding subunit adopts a structure in which the radius of the first small circular ring is r11, the length of the first patch is l1, and the radius of the second large circular ring is r 12;
the second coding subunit adopts a structure that the radius of a second small circular ring is r21, the length of a second patch is l2, and the radius of a second large circular ring is r 22; wherein r11 ═ r21, l1< l2, and r12< r 22.
In one embodiment, the transparent dielectric plate is made of any one of PMMA, quartz and PET.
In one embodiment, the coding subunits have an intersection point of straight lines with diameters at the centers of all the large rings and the small rings.
In one embodiment, the process of determining the number and the positions of the first coding subunit and the second coding subunit on the first surface of the transparent dielectric slab through the optimal coding sequence comprises the following steps:
s1: constructing a diffuse reflection super surface comprising M multiplied by N periodically arranged super surface units, and according to the superposition principle of array antenna directional diagrams, when incident electromagnetic waves act on the diffuse reflection super surface, expressing a far field scattered field F of the diffuse reflection super surface through a unit direction function EP and an array factor direction function AF:
F＝EP·AF
wherein k is0Representing the wave number in free space,
and d represents the phase response and period of the diffusely reflecting super-surface element, θ and
respectively representing the pitch angle and azimuth angle, theta, of the reflected electromagnetic waveiAnd
respectively representing the pitch angle and the azimuth angle of the incident electromagnetic wave;
s2: constructing a cost function Costfunction through F, and exhaustively optimizing the coding sequence of the diffuse reflection super-surface through the Costfunction to obtain an optimal coding sequence, wherein the expression of the Costfunction is as follows:
CostFunction＝min(Fmax)；
s3: and corresponding the binary code '0' in the optimal coding sequence to the first coding subunit, and corresponding the binary code '1' to the second coding subunit to obtain the number and the positions of the first coding subunit and the second coding subunit on the first surface of the transparent medium plate.
The technical scheme of the invention has the following advantages:
the invention provides a broadband high-transparency diffuse reflection super surface which comprises a transparent dielectric plate, a coding unit and a grid, wherein a first coding subunit and a second coding subunit printed on the first surface of the transparent dielectric plate are both annular patches, the line width of each annular patch is far smaller than the size of the whole structure, and a grid structure is printed on the second surface opposite to the first surface.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic diagram of an overall structure of a broadband high-transparency diffuse reflection super-surface according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of periodically arranged encoding units of a broadband high-transparency diffuse reflection super surface according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a grid structure of a broadband high-transparency diffuse reflection super-surface according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a first encoding subunit of a broadband high-transparency diffuse reflection super-surface according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a second encoding subunit of the broadband high-transparency diffuse reflection super-surface according to the embodiment of the present invention;
FIGS. 6(a) - (b) are graphs showing simulation results of reflection amplitude and reflection phase of basic units of a broadband high-transparency diffuse reflection super-surface provided by the embodiment of the invention;
FIGS. 7(a) - (c) are schematic diagrams of the fringe fields at 11GHz, 15GHz and 18GHz respectively when the plane waves are vertically incident according to the embodiment of the invention;
FIG. 8 is a graph of dual station RCS reduction at normal incidence by a plane wave, compared to a flat metal plate of the same dimensions, as provided by an embodiment of the present invention;
figure 9 is a graph of the dual station RCS reduction provided by an embodiment of the present invention when the plane wave is tilted at 15 °, 30 °, 45 ° incidence compared to a flat metal plate of the same dimensions.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. 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.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
The embodiment of the invention provides a broadband high-transparency diffuse reflection super surface, relates to a high-transparency diffuse reflection super surface capable of reducing a radar scattering cross section, and can be used for reducing the radar scattering cross section of an optical transparent window. As shown in FIG. 1, the device comprises a transparent medium plate 1, a coding unit 2 and a grid 3.
In the embodiment of the present invention, the transparent dielectric plate is made of any one of optical transparent materials of PMMA, quartz and PET, which is only used as an example and not limited thereto, and the corresponding optical transparent material is selected according to actual requirements in actual application; for example, the transparent dielectric sheet of this embodiment is made of a rectangular PET material having a side length of 96mm and a thickness of 3mm, and has a relative dielectric constant of 2.7 and a loss tangent of 0.018.
In the embodiment of the present invention, a first surface of a transparent dielectric plate 1 is printed with M × N coding units 2 arranged periodically, M is greater than or equal to 2, N is greater than or equal to 2, a second surface opposite to the first surface is printed with a grid 3, the coding units include K × K coding subunits arranged periodically, K is greater than or equal to 2, as shown in fig. 2, when M is 6 and N is 6, the center of the coding unit 2 is located on a central normal line of the transparent dielectric plate 1, the period of the coding subunit is 8mm, and in order to approximate a simulated period boundary condition, the structural schematic diagram of the coding unit 2 in the embodiment of K is 2.
In the embodiment of the present invention, the mesh 3 is composed of regular hexagonal patches, which is only exemplified and not limited thereto, and the corresponding shape is selected according to actual requirements in practical application; as shown in fig. 3, the grid 3 is a "honeycomb" structure composed of a plurality of regular hexagonal rings, each internal angle of the regular hexagon is 120 °, and each splicing point can just accommodate 3 internal angles, so that the regular hexagons can be densely paved into a whole plane structure without gaps and only with overlapped sides, and the grid structure composed of the regular hexagonal rings can be effectively electrically connected in a maintaining structure.
In the embodiment of the present invention, in the M × N coding units 2 arranged periodically, the coding subunits include four half small rings, four three-quarter large rings, and patches with equal widths, wherein the small rings and the large rings are alternately connected by the patches to form a closed loop, and the radius of the large ring and the radius of the small ring are both related to the length of the patches, and because the closed loop needs to be formed, the radius of the large ring and the radius of the small ring need to be matched with the length of the patches; the patch can be a rectangular patch, which is only taken as an example and not limited to this, and a corresponding patch shape is selected according to actual requirements in actual application; as shown in fig. 4 and 5, the coding subunit adopts a structure in which two non-closed circular rings with different sizes are connected, the line width w is 0.2mm, the radius of one-half circular ring is r 11-r 21-0.3 mm, the distance d from the center of the unit is 0.8mm, the symmetry axes of the four one-half circular rings are respectively on the horizontal or vertical bisector of the unit structure and can be mutually obtained by rotating by integral multiples of 90 °, the patch connects the four one-half small circular rings with the four three-quarter large circular rings, the symmetry axes of the four three-quarter circular rings are respectively on two diagonal lines of the unit structure, wherein the patch length of the first coding subunit 21 is l 1-0.1 mm, and the radius of the four three-quarter large circular rings is r 12-d + l 1-w; the patch length of the second coding subunit 21 is l2 ═ 0.7mm, and the radius r22 of the four three-quarter large circles is d + l 2-w. The structure of the coding subunit has the characteristic of central symmetry, and is insensitive to the polarization mode of the incident electromagnetic wave, the reflection characteristics of the first coding subunit 21 and the second coding subunit 22 meet the requirement of total reflection on amplitude, and meet the requirement of a difference value of 180 degrees +/-30 degrees on phase, and according to the directional diagram superposition principle of the array antenna, the super-surface can realize the scattering of the incident electromagnetic wave to all directions of the upper half space.
In the embodiment of the invention, all the large rings and the small rings of the coding subunits have an intersection point of straight lines with the diameter at the center of each coding subunit.
In the embodiment of the present invention, the process of determining the number and the positions of the first coding subunit 21 and the second coding subunit 22 on the first surface of the transparent dielectric slab through the optimal coding sequence includes:
s1: constructing a diffuse reflection super surface comprising M multiplied by N periodically arranged super surface units, and according to the superposition principle of array antenna directional diagrams, when incident electromagnetic waves act on the diffuse reflection super surface, expressing a far field scattered field F of the diffuse reflection super surface through a unit direction function EP and an array factor direction function AF:
F＝EP·AF
wherein k is0Representing the wave number in free space,
and d represents the phase response and period of the diffusely reflecting super-surface element, θ and
respectively representing the pitch angle and azimuth angle, theta, of the reflected electromagnetic waveiAnd
respectively representing the pitch angle and the azimuth angle of the incident electromagnetic wave;
s2: constructing a cost function Costfunction through F, and exhaustively optimizing the coding sequence of the diffuse reflection super-surface through the Costfunction to obtain an optimal coding sequence, wherein the expression of the Costfunction is as follows:
CostFunction＝min(Fmax)；
s3: and corresponding the binary code '0' in the optimal coding sequence to the first coding subunit 21 and the binary code '1' to the second coding subunit 22 to obtain the number and the positions of the first coding subunit 21 and the second coding subunit 22 on the first surface of the transparent dielectric slab.
The broadband high-transparency diffuse reflection super-surface provided by the embodiment is printed on the first coding subunit and the second coding subunit on the first surface of the transparent dielectric plate, and a metal ring structure with a large duty ratio is adopted to replace a traditional metal surface, so that the light transmittance of the whole structure is improved, and the shielding effect is kept; the size of the whole structure is changed by controlling the length of the rectangular connecting structure of the first coding subunit and the second coding subunit, the phase difference of 180 degrees +/-30 degrees of the broadband is realized in the aspect of reflection characteristics, and the unit structures are circular arc-shaped and easy to process; the coding subunit is still a prototype after being rotated by integral multiple of 90 degrees, and the diffuse reflection super-surface is ensured to have certain polarization insensitivity to incident electromagnetic waves. According to the superposition principle of the directional diagram of the array antenna, the first coding subunit and the second coding subunit are arranged according to the optimized optimal coding sequence, so that the effect of scattering the reflected electromagnetic waves to the upper half space is realized. The final super-surface can realize high transparency and simultaneously maintain the effect of diffuse reflection, and RCS reduction of more than 10dB can be realized in a broadband range of 10.5GHz-19 GHz.
In one embodiment, the technical effect of the present invention is verified as follows:
simulation conditions are as follows:
in the embodiment of the present invention, as shown in fig. 6(a) - (b), a commercial simulation software HFSS _15.0 is used to perform simulation calculation on the amplitude response and the phase response of the basic unit in the above embodiment within the range of 7GHz-22GHz by applying the cycle boundary condition, fig. 6(a) is a reflection phase curve diagram of two basic units in the embodiment of the present invention, and fig. 6(b) is a reflection amplitude curve diagram of two basic units in the embodiment of the present invention.
In the embodiment of the present invention, as shown in fig. 7(a) - (c), simulation calculation was performed using commercial simulation software HFSS — 15.0 on the scattering cross section of the single-station radar in the case where the above-described embodiment was irradiated with electromagnetic waves having frequencies of 11GHz, 15GHz, and 18GHz, respectively. Wherein: FIG. 7(a) is a schematic diagram of a scattered field in the upper half space of a super-surface according to an embodiment of the present invention under the irradiation of electromagnetic waves at 11 GHz; FIG. 7(b) is a schematic diagram of the scattered field in the upper half space of the super-surface according to the embodiment of the present invention under the irradiation of the electromagnetic wave at 15 GHz; FIG. 7(c) is a schematic diagram of the scattered field of the super-surface in the upper half space under the irradiation of the electromagnetic wave of 18GHz according to the embodiment of the present invention.
In the embodiment of the present invention, as shown in fig. 8, the commercial simulation software HFSS _15.0 is used to perform simulation calculation on the reduction amount of the cross section of the two-station radar in the above embodiment compared with a metal plate of the same size under perpendicular irradiation of electromagnetic waves, and the frequency of incident electromagnetic waves varies from 10GHz to 20 GHz.
In the embodiment of the present invention, as shown in fig. 9, the commercial simulation software HFSS — 15.0 is used to perform simulation calculation on the reduction of the cross section of the two-station radar when the TM-polarized electromagnetic wave is obliquely irradiated to the above-described embodiment, compared with a metal plate of the same size, and the incident angles are 15 °, 30 ° and 45 °, respectively, and the frequency of the incident electromagnetic wave is changed from 10GHz to 20 GHz.
In the embodiment of the invention, the simulation result is analyzed as follows:
as shown in fig. 6(a) and fig. 6(b), in the embodiment of the present invention, the reflection amplitudes of the first encoding subunit and the second encoding subunit are both greater than-1 dB within 11.5GHz to 19GHz, and the reflection phase difference between the two can be 180 ° ± 30 °.
As shown in fig. 7, when plane waves of 11GHz, 15GHz, and 18GHz respectively irradiate onto the super-surface of the embodiment of the present invention, the beams in the upper half space are randomly distributed into the space to form a plurality of scattered beams, which indicates that the super-surface of the embodiment of the present invention realizes good diffuse reflection characteristics.
As shown in fig. 8, when a plane wave perpendicularly irradiates the super-surface of the embodiment of the present invention, the RCS reduction of more than 10dB is achieved in the frequency band from 10.5GHz to 19GHz, and the maximum reduction amount can reach 23dB, which indicates that the super-surface of the embodiment of the present invention achieves the low dual-battle radar scattering cross section characteristic in a wide frequency band.
As shown in fig. 9, when a TM polarized plane wave obliquely irradiates the diffuse reflection super-surface according to an embodiment of the present invention, three oblique incidence cases are considered here, and the incidence angles are respectively 15 °, 30 ° and 45 °, and the diffuse reflection super-surface according to an embodiment of the present invention can also maintain a good RCS reduction effect.
The simulation results show that the broadband high-transparency diffuse reflection super-surface provided by the invention can ensure high transparency while realizing a remarkable radar scattering cross section reduction effect.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the spirit or scope of the invention.
Claims (8)
1. The broadband high-transparency diffuse reflection super surface is characterized by comprising a transparent dielectric plate, a coding unit and a grid, wherein,
the first surface of the transparent dielectric plate is printed with M multiplied by N coding units which are periodically arranged, M is more than or equal to 2, N is more than or equal to 2, and a second surface opposite to the first surface is printed with a grid;
the coding unit comprises KxK coding subunits which are periodically arranged, and K is more than or equal to 2; the encoding sub-unit includes: the first coding subunit and the second coding subunit determine the number and the positions of the first coding subunit and the second coding subunit on the first surface of the transparent dielectric slab through the optimal coding sequence;
the coding subunit comprises four half small circular rings, four three-quarter large circular rings and patches which are equal in width, wherein the small circular rings and the large circular rings are alternately connected through the patches to form a closed loop, and the radius of each large circular ring and the radius of each small circular ring are related to the length of each patch.
2. The broadband high transparency diffuse reflection super surface according to claim 1, wherein the structure of the mesh is composed of regular hexagonal patches.
3. A broadband high transparency diffusely reflecting super-surface according to claim 1, wherein the first encoding subunit and the second encoding subunit are sized to correspond in magnitude to the reflection characteristics of the two encoding subunits with a phase difference of 180 ° ± 30 °.
4. The broadband high-transparency diffuse reflection super surface according to claim 1, wherein the first coding sub-unit and the second coding sub-unit are both composed of large circular rings and small circular rings with different radiuses.
5. The broadband high-transparency diffuse reflection super surface according to claim 4, wherein in the M x N coding units which are periodically arranged, the first coding sub-unit adopts a structure that the radius of a first small circular ring is r11, the length of a first patch is l1, and the radius of a second large circular ring is r 12;
the second coding subunit adopts a structure that the radius of a second small circular ring is r21, the length of a second patch is l2, and the radius of a second large circular ring is r 22; wherein r11 ═ r21, l1< l2, and r12< r 22.
6. The broadband high-transparency diffuse reflection super surface according to claim 1, wherein the transparent medium plate is made of any one of PMMA, quartz and PET.
7. The broadband high-transparency diffuse reflection super surface according to claim 1, wherein the intersection point of the straight lines of which all the large and small circular rings have a diameter is positioned at the center of each coding subunit.
8. The process of determining the number and positions of the first coding subunit and the second coding subunit on the first surface of the transparent dielectric slab through the optimal coding sequence according to claim 1 comprises:
s1: constructing a diffuse reflection super surface comprising M multiplied by N periodically arranged super surface units, and according to the superposition principle of array antenna directional diagrams, when incident electromagnetic waves act on the diffuse reflection super surface, expressing a far field scattered field F of the diffuse reflection super surface through a unit direction function EP and an array factor direction function AF:
F＝EP·AF
wherein k is0Representing the wave number in free space,
and d represents the phase response and period of the diffusely reflecting super-surface element, θ and
respectively representing the pitch angle and azimuth angle, theta, of the reflected electromagnetic waveiAnd
respectively representing the pitch angle and the azimuth angle of the incident electromagnetic wave;
s2: constructing a cost function Costfunction through F, and exhaustively optimizing the coding sequence of the diffuse reflection super-surface through the Costfunction to obtain an optimal coding sequence, wherein the expression of the Costfunction is as follows:
CostFunction＝min(Fmax)；
s3: and corresponding the binary code '0' in the optimal coding sequence to the first coding subunit, and corresponding the binary code '1' to the second coding subunit to obtain the number and the positions of the first coding subunit and the second coding subunit on the first surface of the transparent medium plate.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113871895A (en) * | 2021-09-03 | 2021-12-31 | 西安电子科技大学 | Transparent wave absorber of groove type resonance layer and mesh floor |
| CN114447623A (en) * | 2022-02-25 | 2022-05-06 | 哈尔滨工业大学 | Optical transparent diffuse reflection wave absorber with ultra-wideband microwave absorption and scattering functions |
| CN115241653A (en) * | 2022-07-27 | 2022-10-25 | 中国船舶重工集团公司第七二四研究所 | Reflection-type ultra-wideband low-RCS phase gradient super-surface |
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2020
- 2020-12-29 CN CN202011599916.5A patent/CN112713411A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113871895A (en) * | 2021-09-03 | 2021-12-31 | 西安电子科技大学 | Transparent wave absorber of groove type resonance layer and mesh floor |
| CN114447623A (en) * | 2022-02-25 | 2022-05-06 | 哈尔滨工业大学 | Optical transparent diffuse reflection wave absorber with ultra-wideband microwave absorption and scattering functions |
| CN114447623B (en) * | 2022-02-25 | 2023-02-24 | 哈尔滨工业大学 | Optical transparent diffuse reflection wave absorber with ultra-wideband microwave absorption and scattering functions |
| WO2023160435A1 (en) * | 2022-02-25 | 2023-08-31 | 哈尔滨工业大学 | Optically transparent diffuse reflection wave absorber capable of absorbing and scattering ultra-wideband microwaves |
| CN115241653A (en) * | 2022-07-27 | 2022-10-25 | 中国船舶重工集团公司第七二四研究所 | Reflection-type ultra-wideband low-RCS phase gradient super-surface |
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