Table 1 Classification of wireless communication signals by frequency
Band name | Wavelength range | Frequency range | Propagation mode | Application occasion |
|---|---|---|---|---|
Long wave band | 2000–20000 m | 30–300 kHz | Ground wave | Long distance communication |
Mid-band | 200–2000 m | 300–3000 kHz | Ground wave | Broadcast, communication, navigation |
Short wave band | 20–200 m | 3–30 MHz | Sky wave | Middle distance communication |
Ultra-short wave band | I ~ 20 m | 30–300 MHz | Linear propagation, scattering | Mobile communication, TV broadcasting |
Decimeter wave band | 200–2000 m | 300–3000 MHz | Linear propagation, scattering | Mobile communications, satellite communications, |
Centimeter wave band | I ~ 20 m | 3–30 GHz | Straight propagation | TV broadcasting, radar |
Millimeter wave | I ~ 20 m | 30–300 GHz | Straight propagation | Relay communication, radar, satellite |