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||NATO: 20 –
IEEE: 18 – 27 GHz
The NATO K
band is defined as a frequency band between 20 and
40 GHz (7.5–15 mm).
The IEEE K band is a portion of the electromagnetic spectrum in
the microwave range of
frequencies ranging between 18 and 27 GHz. K band between 18 and
26.5 GHz is absorbed easily by water vapor (H2O resonance peak
at 22.24 GHz, 1.35 cm).
The IEEE K band is conventionally divided into three
- Ka band:
K-above band, 26.5–40 GHz, mainly used for radar and
- K-band 18-27 GHz
- Ku band:
K-under band, 12–18 GHz, mainly used for satellite
communications, terrestrial microwave communications, and radar,
especially police traffic-speed detectors.
Atmospheric windows in the infrared. The K band is the transmission
window centred on 2.2 microns
In infrared astronomy, the K band
refers to an atmospheric transmission window centred
on 2.2 microns (in the near-infrared).
The designation "K-band" stems from the German word "kurz"
The microwave spectrum is usually defined as electromagnetic
energy ranging from approximately 1 GHz to 100 GHz in
frequency, but older usage includes lower frequencies. Most common
applications are within the 1 to 40 GHz range. Microwave
frequency bands, as defined by the Radio Society of Great
Britain (RSGB), are shown in the table below:
Footnote: P band is sometimes incorrectly used for Ku Band. "P"
for "previous" was a radar band used in the UK ranging from 250 to
500 MHz and now obsolete per IEEE Std 521, see and . For other
definitions see Letter Designations of