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High temperature-resistant frequency selective surface (FSS) wave-transparent material and preparation method thereof

A technology of frequency-selective surface and wave-transmitting material, applied in chemical instruments and methods, layered products, metal layered products, etc., can solve problems such as the unsatisfactory temperature resistance of flexible membrane structures

Active Publication Date: 2015-01-28
SHANDONG RES & DESIGN ACADEMY OF IND CERAMICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

With the increase of the flight speed of the missile, the requirements for the width of the wave-transmitting frequency band and the stealth performance, the frequency selective surface is not only applied to the inner surface of the radome, but also needs to be applied to the outer surface. Therefore, the temperature resistance of the flexible membrane structure will not meet the requirements. use requirements

Method used

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  • High temperature-resistant frequency selective surface (FSS) wave-transparent material and preparation method thereof
  • High temperature-resistant frequency selective surface (FSS) wave-transparent material and preparation method thereof
  • High temperature-resistant frequency selective surface (FSS) wave-transparent material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0033] The designed FSS composite material is a two-layer ceramic material, three-layer resonant structure, the surface resonant structure is a square, and the middle resonant structure is a grid, see figure 1 . Using silicon nitride as the main raw material, it was formed by dry pressing, protected by nitrogen, and kept at 1700°C for 2 hours. The dielectric constant was 3.2 and the density was 1.8g / cm3. 3 The porous silicon nitride ceramic material is a wave-transmitting material substrate, and the ceramic substrate is placed in a high-vacuum unbalanced magnetron sputtering furnace for coating. The sputtering target material Ti has a purity of 99.995%, and the sputtering gas is argon with a purity of 99.999%, the reaction gas is nitrogen, the purity is 99.999%, the DC RF current is 3A, the substrate bias voltage is 150V, the target-base distance is 150mm, the substrate temperature is 260°C, and the sputtering time is 3000S. A titanium nitride high-temperature-resistant reson...

Embodiment 2

[0035] The designed FSS composite material is two-layer ceramic material, three-layer resonant structure, the surface resonant structure is square, and the middle resonant structure is grid. Using silicon nitride as the main raw material, it was formed by dry pressing, protected by nitrogen, and kept at 1700°C for 2 hours. The dielectric constant was 3.2 and the density was 1.8g / cm3. 3 The porous silicon nitride ceramic material is a wave-transparent material matrix, and the difference from Example 1 lies in the change of size. A screen plate is prepared with a 380-mesh screen, and a platinum-resistant material is prepared on the surface of the ceramic matrix by a screen printing process using platinum slurry. High-temperature resonant structure, the substrate printed with resonant structure is heat-treated at 1300°C under a nitrogen protective atmosphere, and the substrate with resonant structure is compounded into a multi-layer wave-transparent composite material through alum...

Embodiment 3

[0037] The designed FSS composite material is a two-layer ceramic material, three-layer resonant structure, the surface resonant structure and the middle resonant structure are the same structure, see Figure 5 . Using silicon nitride as the main raw material, it was formed by dry pressing, protected by nitrogen, and kept at 1700°C for 2 hours. The dielectric constant was 3.2 and the density was 1.8g / cm3. 3 The porous silicon nitride ceramic material is the wave-transparent material matrix. The screen plate is prepared with a 380-mesh screen. Using platinum paste, a platinum high-temperature-resistant resonant structure is prepared on the surface of the ceramic substrate through a screen printing process. The substrate printed with the resonant structure Heat treatment at 1300°C under a nitrogen protective atmosphere, and compound the matrix with a resonant structure into a multi-layer wave-transparent composite material through an aluminum dihydrogen phosphate binder. By tes...

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Abstract

The invention belongs to the technical field of functional materials and specifically relates to a high temperature-resistant frequency selective surface (FSS) wave-transparent material and a preparation method thereof. A high temperature-resistant ceramic matrix is taken as a carrier of the high temperature-resistant FSS wave-transparent material and an FSS with a resonant structure is attached onto the surface of the high temperature-resistant ceramic matrix. The FSS is directly prepared on the ceramic matrix by use of a high temperature-resistant conducting material, has the high temperature resistance in contrast with a flexible film FSS and is capable of meeting the hiding requirement of an antenna housing during high-Mach flying. The high temperature-resistant FSS wave-transparent material is a compound material of a plurality of layers of FSSs; due to the design of size and shape parameters of the resonant structure of the FSS, the frequency bandwidth and the transmittance of incident electromagnetic waves can be effectively controlled, and a hiding effect with in-band high transmittance and out-of-band rejection can be realized.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and in particular relates to a high-temperature-resistant frequency-selective surface wave-transparent material and a preparation method thereof. Background technique [0002] So far, there are only two types of radome, dielectric radome and metal (windowed) radome. The transparency of the dielectric radome comes from the anti-reflection interference effect of the half-wave thickness, and the transparency of the metal radome comes from the ideal of the free space propagation mode to the waveguide mode. Matching, due to various reasons, the above two kinds of radome can not well achieve special requirements such as good omnidirectional high transparency, wide frequency band, and frequency selection. [0003] According to theoretical calculations, a metal layer is coated on the surface of ceramic media with different dielectric constants. By designing and processing the surface structu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B18/00B32B15/04
CPCB32B15/04B32B18/00B32B33/00B32B2307/20
Inventor 魏美玲王守兴王重海王再义康丽敏
Owner SHANDONG RES & DESIGN ACADEMY OF IND CERAMICS
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