Array electromagnetic shielding optical window with three-period externally-tangent circular rings and internally-tangent sub circular rings

Abstract

The invention discloses an array electromagnetic shielding optical window with three-period externally-tangent circular rings and internally-tangent sub circular rings, and belongs to the technical field of electromagnetic shielding. The three kinds of metal circular rings of different diameters are used as basic circular rings, connecting circular rings and filling circular rings respectively, arranged according to an equilateral triangle or according to shared vertexes of a regular hexagon or according to shared edges of the regular hexagon to form a metallic mesh and loaded on the surface of an optical transparent substrate. The metal circular rings of the same diameter are separated from each other. The outer side of each basic circular ring is provided with six connecting circular rings distributed at equal intervals and provided with six filling circular rings distributed at equal intervals, wherein the six connecting circular rings are communicated with the corresponding basic circular ring in an externally-tangent mode, and the filling circular rings are communicated with the adjacent connecting circular rings in an externally-tangent mode. The basic circular rings are internally provided with the internally-tangent sub circular rings. It is ensured that all the circular rings are mutually conductive at the positions where the circular rings are communicated in a tangent mode through line overlapping or the arrangement of metal capable of ensuring reliable electric linkage between tangency points of the metal rings. According to the metallic mesh, due to the combined action of the three-period externally-tangent circular rings and the internally-tangent sub circular rings, inhomogeneity of distribution of stray light caused by high-level diffraction of the mesh can be remarkably reduced.

Description

technical field [0001] The invention belongs to the field of electromagnetic shielding of optical transparent parts, in particular to an electromagnetic shielding light window with three-period circumscribed ring and inscribed sub-ring arrays. Background technique [0002] With the widening and increasing intensity of the electromagnetic wave application spectrum, the requirements for electromagnetic shielding light windows used in aerospace equipment, advanced optical instruments, communication equipment, medical diagnostic instruments and security facilities are getting higher and higher, mainly requiring light windows While having a super strong broadband electromagnetic shielding ability, it also has a very high light transmittance, and the less impact on optical imaging, observation, and detection, the better. For example, the optical window of an aircraft in the field of aerospace equipment must achieve high-quality isolation of electromagnetic signals inside and outsi...

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Problems solved by technology

[0019] The purpose of the present invention is to overcome the deficiencies of the above-mentioned existing optical window electromagnetic shielding technical solutions, especially for the existing single-layer grid metal grid, single-layer ring grid, double-layer grid and ring grid. In order to solve the problem of relatively concentrated stray light distribution caused by sub-diffraction, an electromagnetic shielding light window with a three-period circumscribed ring and inscribed sub-ring array was developed to achieve depth homogenization of high-order diffraction and extremely low impact on imaging quality. Purpose

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