Electromagnetic darkroom

Japanese: 電波無響室 - でんぱむきょうしつ(英語表記)electromagnetic darkroom
Electromagnetic darkroom
Also known as an anechoic chamber. It is equivalent to an anechoic chamber for sound and a dark room for light. Usually, radio wave devices such as antennas are designed based on the specifications of what characteristics they will have when placed in an infinitely large space. Therefore, to investigate their characteristics through experiments, a space that is infinitely large in terms of radio waves, that is, a space where there are no reflected radio waves from anything other than the test object, is required. To create such a thing in a finite space, it is sufficient to cover the walls of the finite space with suitable radio wave absorbers.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:
電波暗室ともいう。音に対する無響室,光に対する暗室に相当するものである。通常電波機器たとえばアンテナなどの設計は,それが無限に広い空間におかれたときにどのような特性をもつかという仕様によって設計されることが多い。したがってその特性を実験で調べるためには,電波的に無限に広い空間すなわち被試験体以外からは反射の電波がない空間が必要になる。このようなものを有限空間に作るためには,有限空間の壁に相応の電波吸収体を張りめぐらせばよいことになる。

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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