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Multispectral transparent microwave absorbing material and preparation method thereof

A microwave absorbing material and multi-spectral technology, applied in the field of multi-spectral transparent microwave absorbing materials and its preparation, can solve the problems that window glass cannot achieve optical transparency and microwave shielding, absorption compatibility, etc.

Active Publication Date: 2020-08-21
BEIJING INST OF ENVIRONMENTAL FEATURES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a multi-spectral transparent microwave absorbing material based on a periodic metal grid, which solves the problem that the window glass of the optical system cannot achieve optical transparency and microwave shielding and absorption compatibility.

Method used

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  • Multispectral transparent microwave absorbing material and preparation method thereof
  • Multispectral transparent microwave absorbing material and preparation method thereof
  • Multispectral transparent microwave absorbing material and preparation method thereof

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preparation example Construction

[0056] In a second aspect, the present invention provides a method for preparing the multi-spectral transparent microwave absorbing material provided in the first aspect of the present invention, the preparation method comprising the following steps:

[0057] (1) a step of plating a surface layer periodic metal grid on the upper surface of the optical window by photolithography; and

[0058] (2) A step of plating the underlying periodic metal grid on the lower surface of the optical window by using a photolithography process.

[0059] It should be noted that the change in the order of step (1) and step (2) will not affect the preparation method.

[0060] In some preferred embodiments, the step (1) is carried out as follows:

[0061] Coating photosensitive adhesive on the surface of the optical window, using a mask plate prefabricated according to the pattern of the periodic metal grid on the surface for pattern exposure, and then developing, and then using vacuum magnetron sput...

Embodiment 1

[0069] The multi-spectral transparent microwave absorbing material provided in this embodiment is composed of a periodic metal grid on the surface, an optical window, and a periodic metal grid on the bottom layer, and has a three-layer structure, such as figure 1 As shown, the optical window is located in the middle, the surface periodic metal grid is formed on the upper surface, and the bottom layer periodic metal grid is formed on the lower surface.

[0070] From top to bottom, the first layer is the surface periodic metal grid, thickness d1=0.05mm, the second layer is the optical window, the material is quartz glass, thickness d2=5mm, the third layer is the bottom periodic metal grid, thickness d1 = 0.05 mm. Among them, the surface periodic metal grid is plated on the upper surface of the optical window glass by photolithography. The periodic structural unit is a regular hexagon. The structural unit and periodic form are as follows: figure 2 As shown, side length a=4mm, l...

Embodiment 2

[0080] The multi-spectral transparent microwave absorbing material provided in this embodiment is composed of a periodic metal grid on the surface, an optical window, and a periodic metal grid on the bottom layer, and has a three-layer structure, such as figure 1 As shown, the optical window is located in the middle, the surface periodic metal grid is formed on the upper surface, and the bottom layer periodic metal grid is formed on the lower surface.

[0081] From top to bottom, the first layer is the surface periodic metal grid, thickness d1=0.05mm, the second layer is optical window glass, the material is quartz glass, thickness d2=3mm, the third layer is the bottom periodic metal grid, thickness d1 = 0.05mm. Among them, the surface periodic metal grid is plated on the upper surface of the optical window glass by photolithography. The periodic structural unit is a regular hexagon. The structural unit and periodic form are as follows: figure 2 As shown, a=5mm, b=0.08mm. T...

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Abstract

The invention relates to a multispectral transparent microwave absorbing material and a preparation method thereof. The multispectral transparent microwave absorbing material comprises an optical window, a surface periodic metal mesh formed in the upper surface of the optical window and a bottom periodic metal mesh formed in the lower surface of the optical window. According to the invention, theupper surface and the lower surface of the window glass of the optical system are respectively plated with a metal mesh with a specific line width and a specific periodic structure by adopting a photoetching process; the optical window material with multispectral transparency and microwave absorption characteristics is formed, the light transmittance of the optical window material in visible lightand infrared frequency spectrums is greater than 80%, an absorption peak exists in a microwave frequency band of 8-18GHz, the minimum value of reflectivity is not greater than-6dB, and the optical window material has polarization insensitivity.

Description

technical field [0001] The invention relates to the technical field of microwave absorbing materials, in particular to a multi-spectrum transparent microwave absorbing material and a preparation method thereof. Background technique [0002] With the development of system integration technology, more and more instruments and equipment have optical system and microwave system at the same time, and the two influence each other. Microwave systems usually have shielding and absorbing requirements, which puts higher requirements on the electromagnetic performance of the optical system window, and it is necessary to achieve microwave shielding and absorption under the condition of ensuring optical transparency. The traditional method of using ITO conductive film is only effective for visible light systems. The single-layer metal grid can realize microwave shielding under the condition of ensuring optical transparency, but it cannot realize microwave absorption, which is not allowe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05K9/00G02B1/00G02B5/00C23C14/04C23C14/18C23C14/35
CPCH05K9/0094H05K9/0086C23C14/042C23C14/185C23C14/35G02B1/00G02B5/00
Inventor 杨智慧李婷孙新于海涛王焕青田文明贺军哲
Owner BEIJING INST OF ENVIRONMENTAL FEATURES
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