Method for forming frequency selective surface structure on folding-unavailable curved surface

A frequency-selective surface and curved surface technology, applied to waveguide devices, radiation unit covers, electrical components, etc., can solve the problems of degraded stealth effect, exposure difficulty in focusing, low efficiency, etc., to achieve industrial mass production and the best graphic quality Excellent, simple operation method

Active Publication Date: 2014-10-01
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no mature technology for plane non-developable surfaces.
For example, the FSS screen that adopts curved surface approximation slices and lays flat PCB technology will form a large number of folds and seams, seriously destroying the continuity of the FSS array, increasing the out-of-band RCS (Radar Cross Section, radar cross section), and degrading the stealth Effect; when the chemical etching method is applied on a curved surface, it is difficult to focus the exposure, and it is easy to form false exposure, which cannot meet the accuracy requirements of the FSS structure; the numerical control machining method controls the precision tool to directly describe the surface of the metallized radome, which has low efficiency and poor precision , there is a processing dead angle for the concave surface
[0004] CN103395205A discloses a method for forming a FSS radome by 3D printing in an additive manner. Although the method can realize a fine FSS structure by 3D printing, due to the limitation of 3D printing technology, the materials used are pure resin or short The fiber particle reinforced composite material has lower strength than the continuous fiber reinforced resin composite material commonly used in the current radome, so the strength of the radome made by this method is very low
CN102882002A discloses a method for improving the performance of a non-deployable curved surface FSS radome. By designing an expandable planar radome whose volume is slightly smaller than the inner surface contour of the radome, it is inserted into the original radome, and the expandable planar radome is pasted on the expandable planar radome. The corresponding function is obtained by covering the plane FSS screen, but this method occupies the inner space of the radome, which is equivalent to increasing the thickness of the radome wall and reducing the wave penetration performance of the radome

Method used

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  • Method for forming frequency selective surface structure on folding-unavailable curved surface
  • Method for forming frequency selective surface structure on folding-unavailable curved surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] will be like figure 1 The FSS periodic array pattern shown in is overprinted with conductive ink and non-conductive ink on the water-soluble PVA film by general screen printing equipment, wherein the thickness of the printing ink layer is about 45 microns, and the volume resistivity of the conductive ink is 5×10 -4 Ω cm; the volume resistivity of non-conductive ink is 4.2×10 7 Ω·cm. Spread the film on a calm water surface at 35°C, with a temperature fluctuation of ±1°C, and the ink side of the film is naturally flattened upwards. After the PVA film is melted, xylene is sprayed on the graphic surface, and the ink layer turns into an oil film, and the ink layer is on the water surface. The linear expansion is 0.6%. Align the center of the top of the radome whose surface is a non-expandable hyperbolic surface with the center of the oil film, and slowly sink into the water from top to bottom at a speed of 0.7mm / s. The oil film is attached to the surface of the radome unde...

Embodiment 2

[0035] will be like figure 1 The FSS periodic array pattern shown in is overprinted with conductive ink and non-conductive ink on water-soluble PVA film by general-purpose screen printing equipment, where the thickness of the printed ink layer is about 35 μm, and the volume resistivity of the conductive ink is 3.1×10 -5 Ω cm; the volume resistivity of non-conductive ink is 7.9×10 8 Ω·cm. Lay the film on a calm water surface at 30°C, temperature fluctuation ±1°C, the ink side of the film is naturally flattened, and after the PVA film melts, spray a mixed solution of dibutyl phthalate and methyl ethyl ketone on the surface of the pattern ( 2: 1 / weight ratio), the ink layer transforms into an oil film, and the linear expansion of the ink layer on the water surface is 0.1%. Align the center of the top of the radome whose surface is a non-expandable hyperbolic surface with the center of the oil film, and slowly sink into the water from top to bottom at a speed of 0.7mm / s. The oil f...

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Abstract

The invention provides a method for forming a frequency selective surface structure on an folding-unavailable curved surface. The method includes the steps that printing ink is used for overprinting an FSS cycle array graph on a water-soluble PVA thin film, a water-soluble PVA thin film graph with the FSS cycle array graph overprinted is upward laid on a peaceful water surface, atomized organic solvents are sprayed on the FSS cycle array graph, an oil film graph is stuck to the surface of a product with the folding-unavailable curved surface, and the FSS cycle array graph is obtained on the surface of the product with the folding-unavailable curved surface. According to the method for forming the frequency selective surface structure on the folding-unavailable curved surface, an original technology and materials of the product do not need to be changed, the FSS graph can be produced on any curved surface shape (especially the folding-unavailable curved surface), the produced FSS array structure is continuous and fine, and the graphics solution line width reaches 0.1 mm.

Description

technical field [0001] The invention relates to a method for forming a frequency-selective surface structure on a non-developable curved surface, belonging to the fields of micromachining and microwave technology. Background technique [0002] Frequency Selective Surfaces (FSS) is a microwave periodic structure, which is regularly etched on the plane or curved surface of the substrate to form aperture units or paste metal patch units. When the unit size is half the wavelength of the incident wave Resonance occurs at an integer multiple, and the incident wave is totally reflected (patch-type structure) or fully transmitted (aperture-type structure). The combination of FSS technology and radome can be made into FSS radome. The working frequency band of our radar is designed as a passband, and the frequency band of the enemy's detection radar is designed as a stop band. It can reflect the enemy's radar wave while passing through our radar wave. Effectively reducing the radar c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q1/42H01P1/20
Inventor 李洪深唐培毅杨洁颖郝强郭世峰裴雨辰
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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