Extremely High Frequency
Definition/Scope: Extremely High Frequency (EHF) is the highest radio frequency. EHF is virtually useless over long distances. EHF is also known as MMW (millimeter wave). It is very susceptible to atmospheric interference. It is used primarily in radio astronomy and remote sensing. It is also being used for high-speed point to point wireless local area networks. It also has applications within the security arena such as body scanning. Use of EHF frequencies provides for narrow antenna beams for LPD and antijam capability. Additionally, EHF frequencies provide wide bandwidths for nuclear effects mitigation, as well as antijam capability. Both wide and narrow spot beam satellite antennas provide appropriate power levels for a variety of user terminals.
Related Terms:Advanced Extremely High Frequency System