A metal grid frequency selective surface structure and its manufacturing method

Abstract

The invention discloses a metal mesh frequency selection surface structure and a manufacturing method, and belongs to the technical field of optical windows. The structure comprises a substrate, and a transparent mesh film which is distributed on the surface of the substrate and has a periodic hole array. The method comprises the steps: manufacturing a frequency selection surface resonance unit mask structure on the upper surface of the substrate firstly; employing a coating method to coat crack nail polish containing aqueous acrylic resin, thereby forming a mask film; enabling mask liquid to be naturally dried to form a crack template under the specific conditions secondly; depositing a conductive metal layer on the surface of the crack template thirdly; and sequentially dissolving the crack template, removing the frequency selection surface resonance unit mask structure, and obtaining the structure finally. The structure and method not only solve a problem of reducing the light transmittance performance of an optical window because of the increase of the width of a metal wire, but also prevent a conventional mechanical friction mode from reducing the light transmittance performance and the electromagnetic shielding performance of the optical window at the same time. Moreover, the specific machining conditions for solving a problem of the uneven distribution of the high-order diffraction energy are given.

Description

Technical field [0001] A metal grid frequency selective surface structure and a manufacturing method belong to the technical field of optical windows. Background technique [0002] Optical windows are widely used in remote sensing, medical diagnosis, confidential communication, aerospace equipment and other fields. The traditional optical window is a pure electromagnetic wave transmission window. However, the continuous growth of electrical equipment will not only greatly increase the intensity of electromagnetic waves, but also broaden the band of electromagnetic waves, causing the electromagnetic environment of space to deteriorate day by day. Because traditional optical windows have permeability to electromagnetic waves, the electromagnetic environment deteriorates Will adversely affect electromagnetically sensitive equipment. In order to reduce electromagnetic interference, an electromagnetic shielding function needs to be added to the optical window. In the prior art, a m...

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Problems solved by technology

[0011] In view of the above-mentioned shortcomings and deficiencies, the present invention discloses a metal grid frequency selective surface structure and a manufacturing method. The method not only avoids the use of titanium dioxide solution, but also avoids the problem of reducing the light transmission performance of the metal grid frequency selective surface structure due to the increase of the metal line width. problem, and there is no need to remove the template by mechanical friction, avoiding the traditional mechanical friction method while reducing the light transmission performance and electromagnetic shielding performance of the frequency selective surface structure of the metal grid, and also provides specific solutions to the problem of uneven distribution of high-order diffraction energy The processing conditions make the metal grid frequency selective surface structure produced by the method of the present invention not only have good electromagnetic shielding performance, but also achieve the effect of no obvious diffraction when solving the problem of uneven distribution of high-order diffraction energy, with good Light transmission performance

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