The Extremely High Frequency (EHF) band is defined as which range?

The Extremely High Frequency (EHF) band is defined as which range?

• A. 30-300 GHz
• B. 3-30 GHz
• C. 300-3000 GHz
• D. 0.3-3 GHz

Answer: (A)

Frequencies are grouped into named bands, and Extremely High Frequency marks the upper end of the microwave range. This band runs from about 30 to 300 gigahertz, which corresponds to wavelengths roughly 1 centimeter down to 1 millimeter. This exact span distinguishes it from adjacent ranges: below 30 GHz sits the lower microwave bands, while above 300 GHz you reach the terahertz region. Because of how high the frequency is, signals in this band face greater atmospheric attenuation and benefit from very directional antennas and line-of-sight paths, making it useful for high-capacity point-to-point links, certain radar and sensing applications, and some satellite communications.

Frequencies are grouped into named bands, and Extremely High Frequency marks the upper end of the microwave range. This band runs from about 30 to 300 gigahertz, which corresponds to wavelengths roughly 1 centimeter down to 1 millimeter. This exact span distinguishes it from adjacent ranges: below 30 GHz sits the lower microwave bands, while above 300 GHz you reach the terahertz region. Because of how high the frequency is, signals in this band face greater atmospheric attenuation and benefit from very directional antennas and line-of-sight paths, making it useful for high-capacity point-to-point links, certain radar and sensing applications, and some satellite communications.