extremely high frequency

Japanese: extremely high frequency(英語表記)extremelyhighfrequency
extremely high frequency

…Radio waves with wavelengths between 1mm and 10mm, or frequencies between 30 and 300GHz. The official name is EHF (short for extremely high frequency). It has almost the same properties as light, travels in a straight line, and is significantly attenuated by fog and rain. …

*Some of the terminology that mentions "extremely high frequency" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…波長が1mmから10mmまでの範囲の電波,すなわち周波数で30~300GHzの範囲の電波をいう。公式の呼称はEHF(extremely high frequencyの略)である。ほとんど光と同様の性質を有するようになり,直進するとともに霧や雨の減衰が著しくなる。…

※「extremely high frequency」について言及している用語解説の一部を掲載しています。

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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