CN113193379B - Design method of S/C dual-band multi-layer tunable frequency selection surface - Google Patents
Design method of S/C dual-band multi-layer tunable frequency selection surface Download PDFInfo
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- CN113193379B CN113193379B CN202110399771.2A CN202110399771A CN113193379B CN 113193379 B CN113193379 B CN 113193379B CN 202110399771 A CN202110399771 A CN 202110399771A CN 113193379 B CN113193379 B CN 113193379B
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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
- H01Q15/0013—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective
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Abstract
A preparation method of an S/C dual-band multilayer tunable frequency selective surface belongs to the technical field of dual-band frequency selective surfaces. The invention aims to solve the technical problems of poor low-frequency wave-absorbing performance and single working frequency in the existing frequency selection surface. The method comprises the following steps: firstly, adding polyvinyl butyral powder into absolute ethyl alcohol, stirring at room temperature by using a magnetic stirrer until the solution is transparent, then adding different amounts and types of powder, tributyl phosphate and dibutyl phthalate, stirring again to obtain a suspension, then casting to form a film, and drying or air-drying to obtain a plurality of films; secondly, respectively engraving to obtain a honeycomb structure on the film and obtain a plurality of single-layer frequency selective surfaces; and step three, stacking the materials together according to different modes, respectively testing the wave absorbing performance, drawing a reflection loss curve graph of the wave absorbing performance, and summarizing the change rule of the wave absorbing performance. The invention has good stealth effect on the radar wave detection of S, C wave bands.
Description
Technical Field
The invention belongs to the technical field of dual-band frequency selection surfaces.
Background
The frequency selective surface has wide requirements in the fields of military and civil use, the frequency selective surface is applied to the radar stealth technology, due to the frequency selective characteristic of the frequency selective surface, electromagnetic waves of working frequency are reflected or absorbed, and electromagnetic waves outside a working frequency band can normally pass through the frequency selective surface, so that electromagnetic stealth is realized. The radar stealth technology mainly aims at low-frequency L (1-2 GHz), S (2-4 GHz), C (4-8 GHz) and X (8-12 GHz) wave band microwaves, but most of the existing frequency selection surfaces are high-frequency microwave frequency bands, the wave absorbing strength is weak, the wave absorbing bandwidth is narrow, and the full coverage of a certain wave band cannot be realized. In addition, the research on various dual-frequency and even multi-frequency communication technologies is also very variable, the frequency selection surface which only works in a single frequency band can not meet the requirements of people, and the research on the frequency selection surface of the dual-frequency band and even the multi-frequency band gradually becomes a hotspot in the wave absorbing field.
Disclosure of Invention
The invention provides a preparation method of an S/C dual-band multilayer tunable frequency selection surface, aiming at solving the technical problems of poor low-frequency wave-absorbing performance and single working frequency in the existing frequency selection surface.
In order to solve the technical problem, the design method of the S/C dual-band multi-layer tunable frequency selection surface is carried out according to the following steps:
adding polyvinyl butyral powder into absolute ethyl alcohol, stirring at room temperature by using a magnetic stirrer until the solution is transparent to obtain an ethanol solution of PVB, then adding different amounts and types of powder, tributyl acid and dibutyl phthalate, stirring in a vacuum stirrer to obtain a suspension, casting the suspension into a film, and drying or naturally air-drying at room temperature to obtain a plurality of films;
secondly, placing the plurality of films obtained in the first step into a laser engraving machine, guiding the drawn honeycomb structure drawing into the laser engraving machine, and then respectively engraving according to the drawing to obtain a honeycomb structure on the films to obtain a plurality of single-layer frequency selective surfaces;
step three, stacking the multiple single-layer frequency selective surfaces obtained in the step two together according to different combination modes, respectively testing the wave absorbing performance, drawing a reflection loss curve graph of the wave absorbing performance, and summarizing the change rule of the wave absorbing performance;
in the first step, carbonyl iron and graphene intermingled, barium titanate and graphene are selected as the powder.
Further defined, the concentration of the ethanolic solution of PVB in step one is from 5 wt.% to 10 wt.%.
Further, the powder is subjected to ball milling for at least 12h in the first step.
To further define, the various single-layer frequency selective surfaces are labeled with the letters A through I, and the specific powder materials and amounts used for each single-layer frequency selective surface are as follows, based on 4.39g of the polyvinyl butyral powder:
the specific stacking mode is that the letters are stacked from top to bottom in sequence from left to right:
stacking method 1.A + I
Stacking mode 2.A + B + I
Stacking mode 3.A + B + C + I
Stacking mode 4.A + B + C + D + I
Stacking mode 5.A + B + C + D + E + I
Stacking method 6.A + B + C + D + E + F + I
Stacking mode 7.G + A + B + C + D + E + F + I
The stacking mode is 8.H + G + A + B + C + D + E + F + I.
More specifically, H is used in an amount of 50g of barium titanate powder.
Further limiting, the step one of casting film forming is to uniformly pour the suspension on a casting machine, set the speed of a scraper to be 10mm/s and the height to be 1-2 mm, and obtain a film through a casting method; step one, drying for at least 1h at 40 ℃ after casting film forming; or naturally drying for at least 24 h.
And further limiting, stirring for 20min at the rotating speed of 200-400 rpm in the vacuum stirrer in the step two.
Further defining a honeycomb structure drawing with the side length of 6mm and the distance of 15.59mm drawn by AutoCAD in the second step.
Further limiting, in the second step, the engraving of the film is to engrave the film by a diamond wire cutting machine; or the engraving of the film is to engrave the acrylic plate by laser to obtain a template and then engrave the film, wherein the engraving speed is set to be 15 mm/s.
And further limiting, in the third step, the wave-absorbing performance is tested by an arch frame method or a free space method.
According to the preparation method of the S/C dual-band multilayer tunable frequency selection surface, the material and the structure of the frequency selection surface are designed, the multilayer frequency selection surface with the wave absorption range covering the S/C dual-band is successfully prepared, and the tunability of the working frequency can be realized through different combination modes of single layers of the multilayer material. The frequency selective surface has high wave absorbing strength, wide tunable bandwidth and thin overall thickness, and has good stealth effect on the detection of radar waves with S, C wave bands. The preparation method is simple, has high preparation efficiency, does not use special equipment, and can realize large-scale preparation.
Drawings
FIG. 1 is a drawing of a honeycomb structure with a side length of 6mm drawn by AutoCAD;
FIG. 2 is a schematic representation of a single layer film prepared;
FIG. 3 is a schematic representation of a multilayer film prepared;
FIG. 4 is a pictorial view of a prepared frequency selective surface;
fig. 5 is an experimental test result of a frequency selective surface.
Detailed Description
Example 1: the design method of the S/C dual-band multilayer tunable frequency selection surface in this embodiment is performed according to the following steps:
adding 4.39g of polyvinyl butyral (PVB) powder into 50ml of absolute ethyl alcohol, stirring at room temperature by using a magnetic stirrer until the solution is transparent (the time is about 10 hours), obtaining an ethanol solution of the PVB, then adding different amounts and types of powder, 5ml of tributyl phosphate and 3ml of dibutyl phthalate, stirring for 20 minutes in a vacuum stirrer at the rotating speed of 300rpm to obtain a suspension, then uniformly pouring the suspension on a casting machine, setting the scraper speed to be 10mm/s and the height to be 1mm, obtaining a film by a casting method, naturally air-drying for 24 hours, and drying or naturally air-drying at room temperature to obtain a plurality of films;
step two, placing the plurality of films obtained in the step one in a laser engraving machine, guiding a honeycomb structure drawing (shown in figure 1) which is drawn by AutoCAD and has the side length of 6mm and the adjacent distance of 15.59mm into the laser engraving machine, setting the engraving speed to be 15mm/s, engraving twice (namely engraving in the positive direction and the negative direction), then respectively engraving according to the drawing, obtaining a honeycomb structure on the films, and obtaining a plurality of single-layer frequency selection surfaces;
step three, stacking the multiple single-layer frequency selective surfaces obtained in the step two together according to different combination modes, testing the wave absorbing performance through an arch frame method, drawing a reflection loss curve chart of the wave absorbing performance, and summarizing the change rule of the wave absorbing performance;
wherein the individual layer frequency selective surfaces are marked with the letters A to I and, based on 4.39g of polyvinyl butyral powder, the particular powder materials and amounts used for the individual layer frequency selective surfaces are as follows:
the specific stacking mode is that the letters are sequentially stacked from top to bottom from left to right:
stacking method 1.A + I
Stacking mode 2.A + B + I
Stacking mode 3.A + B + C + I
Stacking mode 4.A + B + C + D + I
Stacking mode 5.A + B + C + D + E + I
Stacking method 6.A + B + C + D + E + F + I
Stacking mode 7.G + A + B + C + D + E + F + I
The stacking mode is 8.H + G + A + B + C + D + E + F + I.
More specifically, H is used in an amount of 50g of barium titanate powder.
Single layer carbonyl iron (Fe (CO)) 5 ) The physical diagram of the film is shown in figure 2. The physical diagram of the multilayer film is shown in fig. 3, which includes a graphene film, a barium titanate film, a graphene carbonyl iron inter-doped film, and a carbonyl iron film. The frequency selective surface physical map is shown in fig. 4, and a honeycomb structure with the side length of 6mm is carved on the basis of the original film. The results of the experimental testing of the frequency selective surface are shown in fig. 5. As can be seen from fig. 5, the effective absorption bandwidth of the frequency selective surface completely covers S, C two bands, and the overall resonant frequency of the material is shifted from 8.7GHz in the stacking mode 1 to 4.0GHz in the stacking mode 8, which shows good wave-absorbing performance and tunable characteristics.
Claims (9)
1.A design method of an S/C dual-band multi-layer tunable frequency selection surface is characterized by comprising the following steps:
adding polyvinyl butyral powder into absolute ethyl alcohol, stirring at room temperature by using a magnetic stirrer until the solution is transparent to obtain an ethanol solution of PVB, then adding different amounts and types of powder, tributyl phosphate and dibutyl phthalate, stirring in a vacuum stirrer to obtain a suspension, casting the suspension into a film, and drying or naturally air-drying at room temperature to obtain a plurality of films;
secondly, placing the plurality of films obtained in the first step into a laser engraving machine, guiding the drawn honeycomb structure drawing into the laser engraving machine, and then respectively engraving according to the drawing to obtain a honeycomb structure on the films to obtain a plurality of single-layer frequency selective surfaces;
step three, stacking the multiple single-layer frequency selective surfaces obtained in the step two together according to different combination modes, respectively testing the wave absorbing performance, drawing a reflection loss curve graph of the wave absorbing performance, and summarizing the change rule of the wave absorbing performance;
selecting carbonyl iron, carbonyl iron and graphene which are doped with each other, barium titanate and graphene from the powder in the first step;
the individual frequency selective surfaces are marked with the letters a to I and 5ml of tributyl phosphate and 3ml of dibutyl phthalate, based on 4.39g of polyvinyl butyral powder, are added, the specific powder materials and amounts used for the individual frequency selective surfaces being as follows:
a80 g carbonyl iron
B60 g iron carbonyl
C64 g carbonyl iron and 1g graphene intermingled
D48 g of carbonyl iron and 2g of graphene are intermingled
E32 g of carbonyl iron and 3g of graphene
F16 g of carbonyl iron and 4g of graphene are intermingled
G50G barium titanate
H60 g barium titanate
I5 g of graphene;
the specific stacking mode is that the letters are stacked from top to bottom in sequence from left to right:
stacking method 1.A + I
Stacking mode 2.A + B + I
Stacking mode 3.A + B + C + I
Stacking mode 4.A + B + C + D + I
Stacking mode 5.A + B + C + D + E + I
Stacking method 6.A + B + C + D + E + F + I
Stacking mode 7.G + A + B + C + D + E + F + I
The stacking mode is 8.H + G + A + B + C + D + E + F + I.
2. The method of claim 1, wherein the concentration of the PVB in ethanol solution in step one is from about 5 wt.% to about 10 wt.%.
3. The design method of the S/C dual-band multilayer tunable frequency selective surface of claim 1, wherein the powder is ball milled for at least 12h in the first step.
4.A design method of an S/C dual band multi-layer tunable frequency selective surface as claimed in claim 1, wherein the amount of barium titanate powder used for H is 50 g.
5. The design method of the S/C dual-band multilayer tunable frequency selection surface according to claim 1, wherein the casting film formation in the first step is to pour the suspension on a casting machine uniformly, set the scraper speed to 10mm/S and the height to 1-2 mm, and obtain a thin film by a casting method; step one, drying for at least 1h at 40 ℃ after casting film forming; or naturally drying for at least 24 h.
6. The design method of the S/C dual-band multi-layer tunable frequency selective surface according to claim 1, wherein in the second step, the mixture is stirred in a vacuum stirrer at a speed of 200rpm to 400rpm for 20 min.
7. The method as claimed in claim 1, wherein the honeycomb structure drawing with 6mm side length and 15.59mm spacing is drawn by AutoCAD in step two.
8. The design method of an S/C dual-band multilayer tunable frequency selective surface according to claim 1, wherein the thin film is engraved by a diamond wire cutting machine in the second step; or the engraving of the film is to engrave the acrylic plate by laser to obtain a template and then engrave the film, wherein the engraving speed is set to be 15 mm/s.
9. The design method of the S/C dual-band multilayer tunable frequency selective surface according to claim 1, wherein the wave-absorbing performance is tested by an arch frame method or a free space method in the third step.
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