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Definition of "Extremely High Frequency" |
The band of frequencies from 30 gigahertz to 300 gigahertz. Table of Frequency Bands Extremely Low Frequency. The band of frequencies up to 300 hertz. / Extremely High Frequency is part of the radio frequency in the electromagnetic spectrum. EHF runs the range of frequencies from 30 to 300 gigahertz, above which electromagnetic radiation is considered to be low or far infrared light, also referred to as terahertz radiation. Radio waves in this band have wavelengths from ten to one millimetre, giving it the name millimetre band or millimetre wave, sometimes abbreviated MMW or mmW. / A fixed line network where the telephones must be directly wired into a single telephone exchange. This is known as the public switched telephone network or PSTN. |
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