The IEEE K Band is a segment of the electromagnetic spectrum in the microwave range of frequencies, spanning from 18 to 26.5 GHz. This band is used for various applications, including satellite communications, radar systems, and astronomical observations. In the context of radar, the K Band is particularly valued for its ability to provide high-resolution imaging, which is crucial for both weather monitoring and military applications. Additionally, the K Band is employed in automotive radar systems, aiding in collision avoidance and adaptive cruise control technologies. The high frequency of the K Band allows for smaller antenna sizes, making it suitable for compact and portable devices.
The centre frequencies of the K Band are absorbed by water vapor in the atmosphere due to its resonance at 22.24 GHz, as such the original NATO K Band has been split into three bands, Ku-K-Ka, with this section (18 to 26.5 GHz) being less commonly used than Ku and Ka.