What frequency range is classified as extremely high frequency?

The classification of frequency ranges is outlined by the Institute of Electrical and Electronics Engineers (IEEE) and recognized globally. The extremely high frequency (EHF) range spans from 30 GHz to 300 GHz. This range is utilized for various advanced communication systems, including satellite communications and radar systems, due to its ability to support high-capacity and high-resolution transmissions.

At these frequencies, the characteristics of radio waves change significantly. They exhibit line-of-sight propagation, which means that the transmitting and receiving antennas must be relatively close together without obstacles in the way. This is why the EHF range is particularly suited for applications such as millimeter-wave radar and communications in atmospheric science.

By understanding that the establishment of frequency bands serves specific technologies and needs, one can appreciate the importance of EHF in modern communications and radar systems. The other options provided represent different frequency ranges that do not fit within the EHF classification, highlighting the specificity of frequency assignments in technology use.