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Additional
extremely high frequency
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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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