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Can the absorbing material completely absorb electromagnetic waves?

Author:admin   AddTime:2021-08-20

With the development of modern science and technology, electromagnetic radiation has an increasing impact on the environment. At the airport, due to electromagnetic interference, the plane could not take off, so the flight was delayed; in the hospital, mobile phones often interfere with the normal operation of various electronic medical equipment. Therefore, controlling electromagnetic pollution and finding a kind of absorbing material that can resist and weaken electromagnetic radiation has become the main subject of materials science.

As far as we know, it is impossible for the world's most advanced stealth fighters and the ideal absorbing materials in the laboratory to absorb electromagnetic waves 100%.

Absorbing materials are generally used to prevent the reflection of electromagnetic waves, and shielding materials are generally used to block electromagnetic waves.



The propagation of electromagnetic waves is divided into direct radiation, diffraction and reflection. In order to prevent electromagnetic waves from reaching a certain place, under normal circumstances, use shielding materials that electromagnetic waves cannot penetrate, but pay attention to not only shielding the direct part, but also The diffracted and reflected parts are also blocked, that is to say, it must be blocked in all directions. Of course, absorbing materials can also be used to block, but absorbing materials are generally used to prevent electromagnetic wave reflection. Used to shield electromagnetic waves, some are overkill and complicated. , The effect is not necessarily better than the shielding material.

As far as we know, neither the world's most advanced stealth fighter jets nor the laboratory's ideal weapon absorbing materials can absorb 100% of electromagnetic waves. Absorbing materials are generally used to prevent the reflection of electromagnetic waves, and shielding materials are generally used to block electromagnetic waves.

The propagation of electromagnetic waves can be divided into direct propagation, diffraction propagation and reflection propagation. In order to prevent electromagnetic waves from reaching a certain place, shielding materials that cannot be penetrated by electromagnetic waves are usually used to block, but not only the direct part but also the diffraction and reflection parts must be blocked to prevent electromagnetic waves from reaching a certain place. In other words, all-round shielding. Of course, you can also use absorbing materials for blocking, but absorbing materials are usually used to block and prevent the reflection of electromagnetic waves used to block electromagnetic waves. It is a bit excessive and complicated, and the effect may not be better than shielding materials.

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