What is the EHF frequency range?

What is the EHF frequency range?

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

Answer: (A)

The main idea here is to know where Extremely High Frequency (EHF) sits in the radio spectrum. EHF spans about 30 gigahertz to 300 gigahertz. This places it above the SHF band (3–30 GHz) and well below infrared. So the range that exactly matches EHF is 30–300 GHz, which is why that choice is the correct one. The other options don’t fit: 3–30 GHz is the SHF band, not EHF; 30–3000 MHz covers 0.03–3 GHz, which spans VHF/UHF rather than staying in EHF; and 300–3000 GHz is well into the terahertz region beyond EHF.

The main idea here is to know where Extremely High Frequency (EHF) sits in the radio spectrum. EHF spans about 30 gigahertz to 300 gigahertz. This places it above the SHF band (3–30 GHz) and well below infrared. So the range that exactly matches EHF is 30–300 GHz, which is why that choice is the correct one. The other options don’t fit: 3–30 GHz is the SHF band, not EHF; 30–3000 MHz covers 0.03–3 GHz, which spans VHF/UHF rather than staying in EHF; and 300–3000 GHz is well into the terahertz region beyond EHF.