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NATO K band

The NATO K band is defined as a frequency band between 20 and 40 GHz (7.5–15 mm).

IEEE K band

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).

Subdivisions

The IEEE K band is conventionally divided into three sub-bands:

• K_a band: K-above band, 26.5–40 GHz, mainly used for radar and experimental communications.
• K-band 18-27 GHz
• K_u band: K-under band, 12–18 GHz, mainly used for satellite communications, terrestrial microwave communications, and radar, especially police traffic-speed detectors.

Infrared astronomy

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).

Name

The designation "K-band" stems from the German word "kurz" meaning short.^[1]

Other Microwave bands

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[1] and [2]. For other definitions see Letter Designations of Microwave Bands

See also

References