The K_a band (K-above band) is a portion of the K band of the microwave band of the electromagnetic spectrum. K_a band roughly ranges from 18 to 40 GHz. The 20/30 GHz band is used in communications satellites, downlink 18.3–18.8 GHz and 19.7–20.2 GHz. The term “K_a band” is frequently used to refer to the recommended operating frequencies of WR-28 rectangular waveguide, which is 26.5 to 40.0 GHz.

Microwave bands | Banda Ka