CN113690631A - X-waveband efficient wave-absorbing super-structure surface material - Google Patents
X-waveband efficient wave-absorbing super-structure surface material Download PDFInfo
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- CN113690631A CN113690631A CN202110836092.7A CN202110836092A CN113690631A CN 113690631 A CN113690631 A CN 113690631A CN 202110836092 A CN202110836092 A CN 202110836092A CN 113690631 A CN113690631 A CN 113690631A
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- 239000000463 material Substances 0.000 title claims abstract description 89
- 239000011800 void material Substances 0.000 claims description 23
- 239000012528 membrane Substances 0.000 claims description 18
- 239000003989 dielectric material Substances 0.000 claims description 6
- 238000010329 laser etching Methods 0.000 claims description 4
- 238000003491 array Methods 0.000 claims description 3
- XLJMAIOERFSOGZ-UHFFFAOYSA-M cyanate Chemical compound [O-]C#N XLJMAIOERFSOGZ-UHFFFAOYSA-M 0.000 claims description 3
- 239000007769 metal material Substances 0.000 claims description 3
- 239000002184 metal Substances 0.000 abstract description 10
- 238000010521 absorption reaction Methods 0.000 abstract description 9
- 230000009467 reduction Effects 0.000 abstract description 7
- 238000001514 detection method Methods 0.000 abstract description 5
- 239000010408 film Substances 0.000 description 40
- 230000000694 effects Effects 0.000 description 6
- 239000011358 absorbing material Substances 0.000 description 4
- 239000004643 cyanate ester Substances 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
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- 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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Abstract
The invention provides an X-waveband efficient wave-absorbing super-structure surface material, which is characterized in that four layers of structures are sequentially laminated and compounded into a whole from top to bottom: the array unit comprises a first dielectric layer, a resistance film layer of a microstructure, a second dielectric layer and a metal reflecting layer, wherein the resistance film layer forms a plurality of array units which are periodically arranged on the surface of the dielectric layer. According to the invention, through the combination of the dielectric layer-impedance film layer-dielectric layer-metal reflecting layer, the impedance matching of incident electromagnetic waves of an X wave band can be realized, the high-efficiency electromagnetic wave energy absorption is realized, and a super surface material can be provided for an application platform for realizing RCS reduction corresponding to an X wave band detection radar.
Description
Technical Field
The invention belongs to the technical field of electromagnetic wave absorbing materials, and particularly relates to an X-band efficient wave absorbing metamaterial surface material.
Background
The radar stealth technology mainly refers to the stealth technology for radars working in the range of 3MHz to 300GHz, wherein centimeter wave bands (2 to 18GHz), especially 8 to 12GHz (X wave band) are very important radar detection wave bands, and the radar stealth technology is also the key point of research on ultra-wide band radar stealth technology which is a breakthrough in various countries in the world at present. With the development of radar detection technology and the increasing limitation of tactical indexes on target appearance technology, the original radar stealth material has the defects of narrow frequency band, low efficiency, large density and the like, the application range is limited to a certain extent, and the development of novel wave-absorbing materials and corresponding stealth technology is urgently needed. At present, the exploration of various new materials is being dedicated to further improving and improving the performance of the traditional stealth material at home and abroad, and the ultrastructural surface material is being gradually applied to radar wave stealth materials, so that the requirements of strong absorption, wide frequency band, light weight and thin thickness of the radar stealth material of the new generation are met.
Chinese patent publication CN108493622A discloses a double-medium-layer wave-absorbing material, which comprises two medium plates arranged in a stacked manner, wherein the lower surface of the bottom medium plate is covered with a metal floor, and the upper surfaces of the two medium plates are both printed with array metal patches. The electromagnetic parameters of each layer are changed by adjusting the size of the array metal patch on the upper surface of each dielectric layer, the thickness of each layer of the two dielectric layers and selecting different materials to change the dielectric constant of the dielectric layers, so that the phase of the reflected and refracted wave of the electromagnetic wave entering the material is changed. Part of incident electromagnetic waves are lost by the material in the transmission process, and the rest incident waves are cancelled with reflected waves, so that the effect that the electromagnetic waves are absorbed by the artificial electromagnetic medium material is achieved, and the ultra-thinness of the broadband wave-absorbing material is realized.
At present, the exploration of various new materials is being dedicated to further improving and improving the performance of the traditional stealth material at home and abroad, and the ultrastructural surface material is being gradually applied to radar wave stealth materials, so that the requirements of strong absorption, wide frequency band, light weight and thin thickness of the radar stealth material of the new generation are met.
Disclosure of Invention
In order to solve the technical problem, the invention provides an X-waveband efficient wave-absorbing metamaterial surface material which is characterized in that the structure of the metamaterial surface material is sequentially laminated and compounded into a whole from top to bottom, and the metamaterial surface material comprises four layers of structures, specifically: the device comprises a surface dielectric layer, an impedance film layer, a lower dielectric layer and a metal material reflecting layer, wherein the impedance film layer adopts a microstructure pattern which is formed by laser etching, and the microstructure pattern is a plurality of two-dimensional symmetrical unit arrays which are periodically arranged.
Preferably, the impedance film layer is a PI film with the impedance of 95Ohm/sq, and the thickness is 50 +/-0.1 um.
Preferably, the microstructure is a pattern unit periodically and repeatedly arranged in a horizontal direction and a vertical direction, the pattern unit is P ═ 8 × 8mm, and each pattern unit of the resistance film layer includes: a film material region where the resistive film material is present, and a void region where the film material is etched away; the membrane material region and the void region are two-dimensional centrosymmetric patterns.
Preferably, each pattern unit of the impedance film layer is provided with a square film material area with the side length of 1.33mm and a cross-shaped film material area with the width of 0.67mm and the length of 2.67mm, which is overlapped with the center of the square, wherein the center of the cross-shaped film material area is used as an origin, a cross center line is used as a coordinate axis to establish an X-Y plane coordinate system, the pattern units are divided into 80 × 80 block areas, the block areas are divided into the film material areas or the gap areas, and 4 × 3 gap areas are symmetrically distributed on the periphery of the origin of the coordinate; a staggered configuration of membrane material regions and interstitial regions.
Preferably, the symmetrically distributed 4 × 3 void blocks are respectively located on the 45 degree, 135 degree, 225 degree and 315 degree extension lines of the coordinate system, and the positions except for the 4 × 3 void blocks are all film material areas.
Preferably, the membrane material surrounding the cross shape is a square frame-shaped membrane material area with the side length of 4mm and the width of 1mm, 4 gap areas are clamped between the square frame-shaped membrane material area and the central material area, and the sides of the gap areas are in a sawtooth shape.
Preferably, the 4 gap blocks symmetrically distributed at the 4 vertex angles of the square frame-shaped film material area are in a concave angle and convex angle combined shape, the diameter width is 1mm, the vertex interval between the concave angle and the convex angle is 1mm, the edge of the gap area is in a sawtooth shape, and the gap area is respectively located at the 45-degree, 135-degree, 225-degree and 315-degree positions of the coordinate system.
Preferably, the 4 apex corner regions of the 8 x 8mm pattern element are void areas, the void areas are L-shaped, each side is 1.33mm, the width is 0.67mm, and the edges are saw-tooth shaped.
Furthermore, the surface dielectric layer and the lower dielectric layer are both cyanate prepreg, the thickness of the dielectric material is 3.5-3.7mm, the dielectric constant of the dielectric material is 3.0, and the loss tangent is 0.005.
The double-shaft symmetrical structure can realize broadband absorption of polarization insensitive electromagnetic waves, can realize the absorption effect of the lowest reflection coefficient of more than 20dB in an X range, and can realize efficient RCS reduction, wherein the RCS of a single station is all better than-28 dB in an X wave band range, and the average reduction amount of the RCS relative to a metal plate exceeds 25 dB. According to the invention, through the combination of the dielectric layer-impedance film layer-dielectric layer-metal reflecting layer, the impedance matching of incident electromagnetic waves in an X range can be realized, and meanwhile, the cyanate ester prepreg medium has the characteristics of high-strength pressure resistance, corrosion resistance, salt fog resistance and the like, so that the working robustness of the material in different environments can be effectively ensured, and the material can provide a function for a related application platform to respond to an X-waveband detection radar to realize RCS (radar cross section) efficient reduction of the super-surface material.
Drawings
FIG. 1 is a schematic three-dimensional structure of the present invention.
FIG. 2 is a schematic view of the structure of the intermediate layer of the present invention.
FIG. 3 is a schematic diagram of a periodic structure panel according to the present invention.
FIG. 4 is a graph showing the reflection effect of a normal incidence single-station electromagnetic wave according to the present invention.
Figure 5 is a graph of the effect of forward incident single station RCS of the present invention.
Detailed Description
In order to solve the problems, the invention provides an X-waveband efficient wave-absorbing metamaterial surface material, the overall design of the metamaterial surface material is carried out in a medium-impedance film-medium mode, and the microstructure design is carried out on the surface of an impedance film, so that the minimum absorption effect of 20dB in an X waveband can be realized under the condition of the thickness of less than 8 mm.
The utility model provides a high-efficient wave absorption of X wave band ultrastructural surface material, the structure of ultrastructural surface material from top to bottom laminate in proper order and compound an organic whole, it includes four-layer structure, specifically is: the device comprises a surface dielectric layer, an impedance film layer, a lower dielectric layer and a metal material reflecting layer, wherein the impedance film layer adopts a microstructure pattern which is formed by laser etching, and the microstructure pattern is a plurality of two-dimensional symmetrical unit arrays which are periodically arranged.
The impedance film layer is a PI film with the impedance of 95Ohm/sq, and the thickness is 50 +/-0.1 um.
The microstructure is a pattern unit which is periodically and repeatedly arranged in the horizontal direction and the vertical direction, the pattern unit is P8 multiplied by 8mm, and each pattern unit of the impedance film layer comprises: a film material region where the resistive film material is present, and a void region where the film material is etched away; the membrane material region and the void region are two-dimensional centrosymmetric patterns.
Each pattern unit of the impedance film layer is provided with a square film material area with the side length of 1.33mm, and a cross-shaped film material area with the width of 0.67mm and the length of 2.67mm, which is overlapped with the center of the square, wherein the center of the cross-shaped film material area is used as an origin, a cross central line is used as a coordinate axis to establish an X-Y plane coordinate system, the pattern units are divided into 80X 80 block areas, the block areas are divided into the film material area or the gap area, and 4X 3 gap areas are symmetrically distributed on the periphery of the origin of the coordinate; a staggered configuration of membrane material regions and interstitial regions.
The 4 × 3 symmetrically distributed void blocks are respectively located on the 45 degree, 135 degree, 225 degree and 315 degree extension lines of the coordinate system, and the positions except for the 4 × 3 void blocks are membrane material areas.
Surrounding the cross-shaped membrane material is a square frame-shaped membrane material area with the side length of 4mm and the width of 1mm, 4 gap areas are clamped between the square frame-shaped membrane material area and the central material area, and the sides of the gap areas are in sawtooth shapes.
4 gap blocks which are symmetrically distributed at 4 vertex angles of the square frame-shaped film material area are in a concave angle and convex angle combined shape, the diameter width is 1mm, the vertex interval between the concave angle and the convex angle is 1mm, the side of each gap area is in a sawtooth shape, and the gap areas are respectively located at the positions of 45 degrees, 135 degrees, 225 degrees and 315 degrees of a coordinate system.
The 4 apex angle regions of the 8 x 8mm pattern element are void blocks, the void blocks are L-shaped, each side is 1.33mm, the width is 0.67mm, and the edges are saw-tooth shaped.
The surface dielectric layer and the lower dielectric layer are all cyanate prepreg, the thickness of the dielectric material is 3.5-3.7mm, the dielectric constant of the dielectric material is 3.0, and the loss tangent is 0.005.
According to the embodiment of the invention, the X-waveband efficient wave-absorbing metamaterial surface material comprises at least 4 layers of structures, which are sequentially from top to bottom: the dielectric layer, the microstructure impedance film layer, the dielectric layer and the metal reflecting layer; the resistance film structure layer forms a plurality of array units which are periodically arranged on the surface of the dielectric layer. The impedance film layer is a PI film with the impedance of 95Ohm/sq, the dielectric constant of the dielectric layer material is 3.0, and the loss tangent is 0.005. The unit structure period P is 8mm, the upper layer is cyanate ester prepreg medium, thickness 3.7mm, the middle impedance film microstructure is symmetrical structure, thickness is 50 +/-0.1 um, the third layer is cyanate ester prepreg medium together, thickness is 3.7 mm. The impedance film layer is discretized into 80 × 80 sub-coordinates, and the structural boundaries of the impedance film region correspond to the coordinates as follows:
the thin film processing mainly adopts laser etching processing, and cutting is carried out along the structure boundary so as to realize the acquisition of the gap/impedance film structure.
Compared with the prior art, the application can produce the following beneficial effects: the broadband absorption of polarization insensitive electromagnetic waves can be realized by adopting a biaxial symmetric structure, the absorption effect of the lowest reflection coefficient of over 20dB can be realized in an X range, the single-station RCS is better than-28 dB in the X wave band range, the average reduction amount of the RCS relative to a metal plate exceeds 25dB, and the reduction of the RCS is realized efficiently. According to the method, the dielectric layer-impedance film layer-dielectric layer-metal reflecting layer are combined, the impedance matching of incident electromagnetic waves in an X range can be achieved, meanwhile, the cyanate ester prepreg medium has the advantages of being high in pressure resistant, corrosion resistant, salt fog resistant and the like, the working robustness of the material in different environments can be effectively guaranteed, and the method can provide a corresponding X wave band detection radar for a related application platform to achieve RCS high-efficiency reduction super-surface materials. Further features of the present application and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which is to be read in connection with the accompanying drawings.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the embodiments of the present invention and not for limiting, and although the embodiments of the present invention are described in detail with reference to the above preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the embodiments of the present invention without departing from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. The X-waveband efficient wave-absorbing metamaterial surface material is characterized in that the structure of the metamaterial surface material is sequentially laminated and compounded into a whole from top to bottom, and the metamaterial surface material comprises a four-layer structure, and specifically comprises the following components: the device comprises a surface dielectric layer, an impedance film layer, a lower dielectric layer and a metal material reflecting layer, wherein the impedance film layer adopts a microstructure pattern which is formed by laser etching, and the microstructure pattern is a plurality of two-dimensional symmetrical unit arrays which are periodically arranged.
2. The X-band efficient wave absorbing metamaterial surface material of claim 1, wherein the impedance film layer is a PI film with an impedance of 95Ohm/sq and a thickness of 50 ± 0.1 um.
3. The X-band efficient wave absorbing metamaterial surface material of claim 2 wherein the microstructures are pattern elements periodically and repeatedly arranged in the horizontal and vertical directions, the pattern elements are P-8X 8mm, and each pattern element of the resistive film layer comprises: a film material region where the resistive film material is present, and a void region where the film material is etched away; the membrane material region and the void region are two-dimensional centrosymmetric patterns.
4. The X-waveband efficient wave-absorbing metamaterial surface material as claimed in claim 3, wherein each pattern unit of the impedance film layer has a square film material area with a side length of 1.33mm, and a cross-shaped film material area with a width of 0.67mm and a length of 2.67mm overlapped with the center of the square, the center of the cross is used as an origin, a cross center line is used as a coordinate axis to establish an X-Y plane coordinate system, the pattern units are divided into 80X 80 block areas, the block areas are divided into the film material areas or void areas, and 4X 3 void areas are symmetrically distributed around the origin of the coordinate; a staggered configuration of membrane material regions and interstitial regions.
5. The X-band efficient wave absorbing metamaterial surface material of claim 4, wherein 4X 3 symmetrically distributed void blocks are respectively located on the 45 degree, 135 degree, 225 degree and 315 degree extension lines of the coordinate system, and the positions except the 4X 3 void blocks are membrane material areas.
6. The X-waveband efficient wave-absorbing metamaterial surface material as claimed in claim 5, wherein a square frame-shaped membrane material area with a side length of 4mm and a width of 1mm surrounds the cross-shaped membrane material, 4 gap areas are sandwiched between the square frame-shaped membrane material area and the central material area, and the sides of the gap areas are in a sawtooth shape.
7. The X-waveband efficient wave-absorbing metamaterial surface material as claimed in claim 6, wherein the 4 void blocks symmetrically distributed at 4 vertex angles of the square frame-shaped membrane material area are in a concave-convex angle combined shape, the diameter is 1mm, the distance between the concave angle and the convex angle is 1mm, the edge of the void area is in a sawtooth shape, and the void area is respectively located at 45 degrees, 135 degrees, 225 degrees and 315 degrees of a coordinate system.
8. The X-band efficient wave-absorbing metamaterial surface material of claim 7, wherein 4 apex regions of the 8X 8mm pattern units are void blocks, the void blocks are L-shaped, each side is 1.33mm, the width is 0.67mm, and the edges are sawtooth-shaped.
9. The X-band efficient wave-absorbing metamaterial surface material of claim 1, wherein the surface dielectric layer and the lower dielectric layer are cyanate prepreg, the thickness of the dielectric material is 3.5-3.7mm, the dielectric constant of the dielectric material is 3.0, and the loss tangent is 0.005.
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