Radio Frequency
Division Of Radio Frequency (Spectrum Radio Communication Frequencies)
Radio Frequency An electromagnetic wave with frequencies from 3Hz to 3000GHz (3THz). Radio waves are widely used in telecommunications. And in use must no interference. It is strictly controlled by the laws of each country. It is coordinated by a middle name organization. International Telecommunication Union (ITU)
Radio Frequency Allocation. It has been allocated by the ITU for use in different telecommunications technologies. The use of radio frequencies must be authorized. And some popular radio frequencies. Like the frequency used in the phone. Frequency Band Radio Service Or television station. More than 40 telecommunication services are controlled by the ITU. Must request permission and pay rent or concession. Can be used. The ITU has been divided by the frequency of usage. Or the same purpose. It is divided into 12 Frequency bands.
No. | Acronym | Frequency band | wavelength |
| 1 | ELF | 3–30 Hz | 10,000km – 100,000km |
| 2 | SLF | 30 Hz - 300 Hz | 1,000km – 10,000km |
| 3 | ULF | 300 Hz - 3000 Hz | 100km – 1,000km |
| 4 | VLF | 3 kHz - 30 kHz | 10km - 100 km |
| 5 | LF | 30 kHz - 300 kHz | 1 km - 10 km |
| 6 | MF | 300 kHz - 3000 kHz | 100m - 1000m |
| 7 | HF | 3 MHz to - 30 MHz | 10m - 100m |
| 8 | VHF | 30 MHz - 300 MHz | 1m - 10m |
| 9 | UHF | 300 MHz - 3000 MHz | 10cm - 100cm |
| 10 | SHF | 3 GHz - 30 GHz | 1cm - 10cm |
| 11 | EHF | 30 GHz - 300 GHz | 1 mm - 10mm |
| 12 | THF | 300 GHz - 3000 GHz | 0.1mm - 1mm |
Table 1 Table of ITU Radio Bands
| Name of Frequency Band | Acronym | ITU band | Frequency Range | wavelength | Usage Condition |
| Extremely low frequency | ELF | 1 | 3–30 Hz | 100,000 – 10,000 km | Communication with the submarine |
| Super low frequency | SLF | 2 | 30–300 Hz | 10,000km – 1,000km | Communication with the submarine |
| Ultra Low Frequency | ULF | 3 | 300–3,000 Hz | 1,000km – 100km | Underwater Communication, Internal Mining Communication |
| Very Low Frequency | VLF | 4 | 3–30 kHz | 100km – 10km | Navigation, time signal, underwater communication, wireless heart rate monitor, geophysical |
| Low Frequency | LF | 5 | 30–300 kHz | 10km – 1km | Navigation system, time signal, AM-radio, RFID, amateur radio |
| Medium Frequency | MF | 6 | 300–3,000 kHz | 1km – 100m | Medium-Wave AM radio, amateur radio, avalanche alert |
| High Frequency | HF | 7 | 3–30 MHz | 100m – 10 m | Radio SW, radio CB, amateur radio, radio aviation, radar, automatic link link |
| Very High Frequency | VHF | 8 | 30–300 MHz | 10m – 1m | FM radio, television, ground-to-air communications And between aircraft, terrestrial communications to marine mobile stations, amateur radio, weather reports, weather |
| Ultra High Frequency | UHF | 9 | 300–3,000 MHz | 1m – 10cm | Radio, microwave, microwave, radio astronomy, mobile phone, GPS, wireless LAN, bluetooth, sigma, amateur radio, satellite radio, remote control, GMRS radio, FRS radio, ADS-B automatic aircraft |
| Super High Frequency | SHF | 10 | 3–30 GHz | 10cm – 10mm | Microwave communication, radio astronomy, DSRC technology, radar, satellite image transmission and transmission, DBS broadcasting, amateur radio, satellite radio, wireless LAN |
| Extremely High Frequency | EHF | 11 | 30–300 GHz | 10mm –1mm | Microwave radios, microwaves, direct wave energy, millimeter wave scanners, wireless LAN (802.11ad) |
| TeraHertz / Tremendously High Frequency | THz, THF | 12 | 300–3,000 GHz | 1mm – 0.1mm | Medical imaging to replace x-rays, ultrafast molecular dynamics, physics condensation, spectroscopy, domain terrain, TeraHertz computing / communications, remote sensing, amateur radio |
Table 2. Table of ITU Radio Bands & Example Uses
