K band (IEEE)
|18 – 27 GHz|
|1.67 – 1.11 cm|
|ITU radio bands|
|EU / NATO / US ECM radio bands|
|IEEE radio bands|
|Other TV and radio bands|
The IEEE K band is a portion of the radio 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 sub-bands:
- Ka band: K-above band, 26.5–40 GHz, mainly used for radar and experimental communications. NASA's Kepler spacecraft is the first NASA mission to use Ka band DSN communications.
- 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.
The Radio Regulations of the International Telecommunication Union allow amateur radio and amateur satellite operations in the frequency range 24.000 GHz to 24.250 GHz, which is known as the 1.2-centimeter band. It is also referred to as the K band by AMSAT.