What is another word for extremely high frequency?
Pronunciation: [ɛkstɹˈiːmli hˈa͡ɪ fɹˈiːkwənsi] (IPA) 
Extremely high frequency (EHF) is a term used for electromagnetic waves that have a frequency range between 30 GHz to 300 GHz. Different terms can be used interchangeably with EHF, including millimeter waves, terahertz waves, and millimeter band. The frequency range of EHF is above the microwave spectrum, but lower than the infrared spectrum. The use of these waves is becoming increasingly popular in various applications, including telecommunications, remote sensing, and medical imaging. In telecommunications, EHF waves are used to transmit data through satellite links and for advanced wireless communication systems. The terms millimeter waves or terahertz waves can also be used to describe this frequency range.
