Media for information transmission
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- Frequency band, its corresponding name, and usable service
- VLF(Very Low Frequency)
- Propagating along the earth’s surface, including over air and sea
- In transmission, attenuation is small but sensitive to air noise, heat, and/or electricity
- Mainly used for marine communications or long distance radio navigation
- LF(Low Frequency)
- Propagating along the earth’s surface
- Attenuation is larger in daytime when the radio wave is absorbed through natural objects
- Mainly used for long distance radio navigation or as locators
- MF(Middle Frequency)
- Propagating through the troposphere and absorbed through the ionosphere
- Mainly used for AM radio or marine radio broadcasting, and emergency frequency bands
- HF(High Frequency)
- Propagating through the ionosphere
- Mainly used for amateur radio, as personal frequency bands, international broadcasting, telephones, telegraphs, etc.
- VLF(Very Low Frequency)
- Frequency band, its corresponding name, and usable service
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- Frequency band, its corresponding name, and usable service
- VHF(Very High Frequency)
- Propagating through line of sight (LOS)
- Mainly used for VHF TV, FM radio, AM radio or location information in airplanes
- UHF(Ultra High Frequency)
- Propagating through line of sight
- Mainly used for UHF TV, mobile phones, microwave links, etc.
- SHF(Super High Frequency)
- Propagating through line of sight or space
- Mainly used for satellite microwave or radar communications
- EHF(Extreme High Frequency)
- Propagating through space
- Mainly used for radar, satellite, and scientific communications
- VHF(Very High Frequency)
- Frequency band, its corresponding name, and usable service
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- Electromagnetic spectra for communications in radio band
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- Electromagnetic spectra for communications in radio band

