A High Transmittance Adaptive Electromagnetic Shielding Device

Abstract

The invention provides a high light transmittance adaptive electromagnetic shielding device. The electromagnetic shielding device comprises a control module, an electromagnetic shielding module and amagnetic field detection module, wherein the electromagnetic shielding module comprises two shielding layers, the two shielding layers comprise conductive shielding films and multiple composite material shielding bars which are attached on the conductive shielding films, are mutually parallel and are connected in parallel with positive and negative pole leads, the two layers of composite materialshielding bars form an electromagnetic shielding grid, width and temperature of the composite material shielding bars are in direct proportion, the size of the electromagnetic shielding grid is adjusted through magnitude of a magnetic field control current between the positive and negative pole leads, and electromagnetic shielding performance is changed; the magnetic field detection module is usedfor detecting electromagnetic radiation intensity penetrating through the electromagnetic shielding module and converting electromagnetic radiation into a voltage sent to the control module, and thecontrol module is used for comparing the voltage with a preset threshold and adjusting a magnetic field control current according to the comparison result. The electromagnetic screen is advantaged inthat on the condition that electromagnetic shielding performance is guaranteed, and light transmittance of shielding materials is improved to a maximum degree.

Description

technical field [0001] The invention relates to an adaptive electromagnetic shielding device, which can automatically adjust the electromagnetic shielding effect, has high-efficiency electromagnetic shielding performance and high light transmittance, and belongs to the technical field of EMC electromagnetic compatibility. Background technique [0002] Transparent electromagnetic shielding materials can be used not only in the field of aerospace, but also in projects that need to shield electromagnetic radiation, to prevent information leakage in confidential places, computers, rooms and vehicle observation windows, and to solve the functions of various electronic products Interchange, noise, image clutter, machine malfunction, electromagnetic barriers, communication interference, loss of business information, radiation damage to the human body, etc. [0003] Most of the existing electromagnetic shielding windows in China use glass sandwiched with wire mesh, glass doped with ...

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Problems solved by technology

Although wire mesh shielding has sufficient shielding effectiveness (the electromagnetic shielding effectiveness in the 30MHz~1GHz frequency band reaches 50~80dB), there are problems such as poor transparency and diffraction grating; metal powder is generally selected from gold to ensure chemical stability, but The cost is too high; the transparent conductive film usually uses electromagnetic shielding materials such as a single-layer transparent metal oxide (TC0) semiconductor film (such as indium tin oxide IT0), although its light transmittance is good, but it is effective in shielding electromagnetic waves in the high-frequency band above 30MHz Low, can not take into account high light transmittance and good electromagnetic shielding performance in the high frequency band at the same time, and the electromagnetic shielding effect is determined by the thickness of the shielding film and the filling material. After the general structure is determined, the shielding effect is determined , cannot be changed as required

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