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Absorbing material-electromagnetic wave isolation and filtering

Author:admin   AddTime:2021-08-12

Around us, electromagnetic waves are everywhere. When the mobile phone has no signal, I worry about not being able to find the electromagnetic wave; when I turn on the microwave oven, I am afraid that the electromagnetic wave released will "burn out" us. In the field of electromagnetic wave applications, the enhancement and weakening of electromagnetic waves are two inseparable "enemy". The transmission of electromagnetic waves is bound to be accompanied by crosstalk between electromagnetic waves and the surrounding environment. The stronger the signal, the greater the interference. Therefore, how to eliminate the interference of electromagnetic waves has become an important issue in the field of electromagnetic wave applications.

How to isolate electromagnetic waves? Don’t let out, don’t let in, and there is no going back

The scenarios of electromagnetic interference problems can be roughly divided into the following three types: (a) non-leakage type; (b) non-transmission type; (c) there is no return type. The non-leakage type requires that the electromagnetic wave generated by the electromagnetic wave source cannot leak to the outside of the box (ie a certain area); the non-transmission type requires that the electromagnetic wave outside the box cannot enter the inside of the box; the non-return type requires the electromagnetic wave generated inside or outside the box to reach the surface of the box At the time, not only cannot pass through the box, but also requires zero reflected electromagnetic waves. Among them, the difficulty of having to go without return type is the most difficult. The actual application scenario may be a combination of three forms, which is more complicated. In layman's terms, the de-interference process of electromagnetic waves is the isolation process of electromagnetic waves.



Absorbing materials: the "backbone" of electromagnetic wave isolation

The isolation of electromagnetic waves is mainly achieved by absorbing materials. The non-leakage type and the non-transmission type are conventional modes of electromagnetic wave isolation. The electromagnetic interference generated by conventional mobile phone screens and digital camera circuit boards belongs to this type, mainly through conductive materials (copper foil, aluminum foil, conductive polymer, graphene) Etc.) and high-permeability materials can basically meet the application requirements. There is no return type is a complex mode of electromagnetic wave isolation. Most of the absorbing materials commonly used in this kind of scenes are composite materials, such as carbonyl iron, carbon materials, ferrite, polymer and other composite materials can be used as no return Type, absorbing materials to meet the application requirements of various specific scenarios. In practical applications, the absorbing material must have the four characteristics of small (thin) material (coating) thickness, low density (light), large absorption band (wide), and high absorption strength (strong). How to broaden the absorption The absorption frequency band of materials is the focus of current wave-absorbing materials. Common electromagnetic wave frequency bands are widely used from meter wave (~MHz) to millimeter wave (~GHz), and then to terahertz electromagnetic wave (~THz).

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