Electromagnetic shielded observation window

Abstract

A viewing window of electromagnetic shielding is composed of single layer or multiple layer of metal wire mesh, single layer or multiple layer of optical film in quantum well structure and transparent backing material as each layer of metal wire mesh is fabricated by metal thin wire flared-out in single set or multiple set, any two pieces of thin wires in each set of metal thin wire will be in the same plane as parallel to each other; optical film will be metal dielectric media multilayer film contained single layer of metal film or multiple layer of metal film and it is structured by inducible layer which consists of two layer of different transparent media films laid at two sides symmetrically and functional layer which will be compounded in between the inducible layers laid symmetrically as well as it will be embedded on the surface of microwave cavity to be closely compounded with the microwave cavity.

Description

Technical field: [0001] The invention relates to a structure for electromagnetic wave shielding, in particular to an electromagnetic shielding observation window which is transparent in the visible region and is composed of a metal mesh and an optical composite film with a symmetrical quantum well structure. Background technique: [0002] In the prior art, microwaves that are not used for emission are generally limited by a conductive closed cavity, which is generally made of metal, such as a metal microwave resonator or a metal shell with some radio frequency circuit designs inside, such as computer monitor etc. Sometimes because of actual needs, a transparent part is required on this shell, and the electromagnetic wave can be shielded effectively. The observation window used for electromagnetic wave shielding can be used as this kind of transparent part. In the prior art, the observation window used for electromagnetic wave shielding has Wire mesh and multilayer metal die...

AI Technical Summary

Problems solved by technology

The metal itself has a strong absorption of visible light, the metal film is very thick, and the transparency is significantly reduced. For example, the peak transmittance of a single-layer silver film with a thickness of 50 nanometers is less than 7%. If a relatively thin multi-layer metal film is used, the visible light can be greatly improved. The peak transmittance of the area and the width of the highly transparent area, but at this time the conductivity of the metal film is significantly lower than that of the metal body material. If the metal film is too thin, the ideal microwave shielding effect cannot be obtained. Too many layers of metal film will also lead to a significant decrease in the transmittance in the visible light region and lose the transparency of the window. The above reasons also determine that the metal-dielectric multilayer film with an ideal degree of transparency is difficult to exceed 50DB for microwaves above 1G. attenuation effect and therefore cannot be used as a microwave observation window at higher frequencies

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