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A kind of 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: 2022-05-24
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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  • A kind of multispectral transparent microwave absorbing material and preparation method thereof
  • A kind of multispectral transparent microwave absorbing material and preparation method thereof
  • A kind of multispectral transparent microwave absorbing material and preparation method thereof

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preparation example Construction

[0056] The present invention provides, in a second aspect, a preparation method of the multispectral transparent microwave absorption material provided by the present invention in the first aspect, the preparation method comprising the following steps:

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

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

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

[0060] In some preferred embodiments, described step (1) is carried out according to the following method:

[0061] Photosensitive adhesive is coated on the upper surface of the optical window, pattern exposure is performed using a mask prefabricated according to the surface periodic metal grid pattern, and then developed, ...

Embodiment 1

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

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

Embodiment 2

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

[0081] From top to bottom, the first layer is the surface periodic metal grid, the thickness d1=0.05mm, the second layer is the optical window glass, the material is quartz glass, the thickness d2=3mm, the third layer is the bottom periodic metal grid, the thickness d1=0.05mm. Among them, the surface periodic metal grid is plated on the upper surface of the optical window glass by a photolithography process, and 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. The...

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Abstract

The invention relates to a multi-spectral transparent microwave absorption material and a preparation method thereof. The multi-spectral transparent microwave absorbing material includes an optical window, a surface periodic metal grid formed on the upper surface of the optical window, and a bottom periodic metal grid formed on the lower surface of the corresponding optical window. In the present invention, the upper surface and the lower surface of the window glass of the optical system are respectively plated with metal grids with specific line widths and periodic structures by photolithography, so as to form the optical window material with multi-spectral transparency and microwave absorption characteristics. The transmittance in the visible and infrared spectrum is greater than 80%, there is an absorption peak in the microwave 8-18GHz frequency band, the minimum reflectance is not greater than ‑6dB, and it has the characteristics of polarization insensitivity.

Description

technical field [0001] The invention relates to the technical field of microwave absorbing materials, in particular to a multi-spectral 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 both optical system and microwave system, and the two influence each other. Microwave systems usually have requirements for shielding and absorbing waves, which puts forward higher requirements for the electromagnetic performance of optical system windows. 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 achieve microwave shielding under the condition of ensuring optical transparency, but cannot achieve microwave absorption, which is not allowed b...

Claims

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Application Information

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Patent Type & Authority Patents(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