Extremely high frequency

Atmospheric attenuation in dB/km as a function of frequency over the EHF band. Peaks in absorption at specific frequencies are a problem, due to atmosphere constituents such as water vapour (H2O) and molecular oxygen (O2).

Millimeter wave fire control radar for CIWS gun on Russian aircraft carrier Minsk

Extremely high frequency (EHF) is the ITU designation for the band of radio frequencies in the electromagnetic spectrum 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. Millimetre length electromagnetic waves were first investigated in the 1890s by pioneering Indian scientist Jagadish Chandra Bose.

单词	Millimeter wave guidance
释义	Millimeter wave guidance 英语百科 Extremely high frequency Extremely high frequency (EHF) is the ITU designation for the band of radio frequencies in the electromagnetic spectrum 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. Millimetre length electromagnetic waves were first investigated in the 1890s by pioneering Indian scientist Jagadish Chandra Bose.
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Millimeter wave guidance

Extremely high frequency