Electromagnetic shielding optical window with double-layer circular ring metal gridding structure

Abstract

An electromagnetic shielding optical window with a double-layer ring metal grid structure belongs to the technical field of electromagnetic shielding of optical transparent parts. The electromagnetic shielding optical window is composed of two layers of ring metal grids loaded on both sides of the optical window, and each layer of ring metal The grids are composed of metal ring units closely arranged in a two-dimensional orthogonal arrangement, and the outer diameter of the ring of the two-layer ring metal grid is larger than π / 2 of the square side length of the traditional single-layer grid metal grid. times, the distance between the two-layer ring metal grid is 2 to 4 times the outer diameter of the ring. Compared with the traditional single-layer square metal grid, the optical window with double-layer ring metal grid structure does not reduce the light transmission. At the same time, the shielding efficiency is greatly improved, and the high-order diffraction energy distribution is averaged, which solves the problem that high light transmittance, strong electromagnetic shielding efficiency and low imaging quality cannot be taken into account in the existing optical window electromagnetic shielding technology.

Description

technical field [0001] The invention belongs to the field of electromagnetic shielding of optically transparent parts such as aerospace equipment, communication equipment and security facilities, and particularly relates to an electromagnetic shielding optical window with a double-layer ring metal grid structure. Background technique [0002] With the wide application of various electronic devices and the broadening and increasing intensity of electromagnetic wave application spectrum, higher and higher requirements are put forward for optical windows used in aerospace equipment and other fields. The concentrated expression is that optical windows are required to have high transparency While having little impact on imaging quality, it also has super strong broadband electromagnetic shielding capability. Especially in the field of aerospace equipment, the optical window of the aircraft is required to ensure high transparency to complete the detection or imaging task, and at t...

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Problems solved by technology

[0010] The purpose of the present invention is to overcome the shortcomings of the above-mentioned existing optical window electromagnetic shielding technical solutions, especially for the problem that the traditional single-layer grid metal grid cannot take into account the high light transmittance and strong electromagnetic shielding efficiency, and proposes a dual-layer The electromagnetic shielding optical window with a layered ring metal grid structure uses the different influence rules of the double-layer metal grid spacing on the light transmission performance and shielding performance to select the period and spacing of the grid to achieve basically constant light transmittance. In the case of the case, the shielding efficiency is greatly improved

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