It is a device designed to absorb all the energy of radio waves without reflecting it, i.e., to convert it into heat. Generally, when radio waves hit an object with different properties from the space they were propagating through, some of the energy is reflected, but this can be undesirable, and radio wave absorbers are being considered for use in countering ghosting on television signals and for military purposes. The material used must have the ability to convert electromagnetic energy into heat, and typically, electrical materials are made by mixing carbon powder into polystyrene foam, urethane, or rubber, while magnetic materials are made by mixing sintered ferrite, a magnetic material, or its powder into rubber or paint. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
電波が反射せずにすべてのエネルギーを吸収する,すなわち熱に変えてしまうようにくふう,設計されたもの。一般に電波はそれまで伝搬していた空間と性質の異なる物にあたると,一部のエネルギーが反射されるが,それが望ましくない場合があり,電波吸収体はテレビ電波のゴースト対策や軍事利用などが検討されている。用いられる材料は電磁エネルギーを熱に変える特性をもつことが必要で,通常は電気的なものとしてカーボン粉末を発泡スチロール,ウレタンまたはゴムなどに混入させたもの,磁気的なものとして磁性材料である焼結フェライトまたはその粉末をゴムや塗料に混入したものが用いられている。
出典 株式会社平凡社世界大百科事典 第2版について 情報 |
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