极高频(英语:Extremely high frequency),缩写为EHF,中国大陆称极高频,台湾称至高頻,是指波长介于1mm到10mm的电磁波,又称毫米波millimetre wavesmmWave)。

毫米波所对应的频率范围是30~300GHz。主要应用于气象雷达空间通信射电天文等方面。也被用于第五代移动通信系统(5G)[1]

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