Extremely High Frequency (EHF) corresponds to which frequency range?

Extremely High Frequency (EHF) corresponds to which frequency range?

• A. 3-30 GHz
• B. 30-300 GHz
• C. 300 GHz-3 THz
• D. 300 Hz-3 kHz

Answer: (B)

Extremely High Frequency defines the high end of the radio spectrum, typically 30 to 300 gigahertz. At these frequencies, wavelengths are about 1 cm down to 1 mm, so signals are mostly line-of-sight and experience greater atmospheric absorption and path loss. This band is used for specialized applications like certain satellite links and high-bandwidth radar. The range that fits this definition is 30-300 GHz. The other ranges correspond to different bands: 3-30 GHz is the SHF band, 300 GHz-3 THz sits above EHF in the THz region, and 300 Hz-3 kHz is far below RF.

Extremely High Frequency defines the high end of the radio spectrum, typically 30 to 300 gigahertz. At these frequencies, wavelengths are about 1 cm down to 1 mm, so signals are mostly line-of-sight and experience greater atmospheric absorption and path loss. This band is used for specialized applications like certain satellite links and high-bandwidth radar. The range that fits this definition is 30-300 GHz. The other ranges correspond to different bands: 3-30 GHz is the SHF band, 300 GHz-3 THz sits above EHF in the THz region, and 300 Hz-3 kHz is far below RF.