ISM Bands
The ISM bands are defined by the ITU-R in 5.138, 5.150, and 5.280 of the Radio Regulations. Individual countries' use of the bands designated in these sections may differ due to variations in national radio regulations. Because communication devices using the ISM bands must tolerate any interference from ISM equipment, unlicensed operations are typically permitted to use these bands, since unlicensed operation typically needs to be tolerant of interference from other devices anyway. The ISM bands do have licensed operations; however, due to the high likelihood of harmful interference, licensed use of the bands is typically low. In the United States of America, uses of the ISM bands are governed by Part 18 of the FCC rules, while Part 15 contains the rules for unlicensed communication devices, even those that use the ISM frequencies.
The ISM bands defined by the ITU-R are:
| Frequency range | Bandwidth | Center frequency | Availability | |
|---|---|---|---|---|
| 6.765 MHz | 6.795 MHz | 30 kHz | 6.780 MHz | Subject to local acceptance |
| 13.553 MHz | 13.567 MHz | 14 kHz | 13.560 MHz | |
| 26.957 MHz | 27.283 MHz | 326 kHz | 27.120 MHz | |
| 40.660 MHz | 40.700 MHz | 40 kHz | 40.680 MHz | |
| 433.050 MHz | 434.790 MHz | 1.84 MHz | 433.920 MHz | Region 1 only and subject to local acceptance |
| 902.000 MHz | 928.000 MHz | 26 MHz | 915.000 MHz | Region 2 only |
| 2.400 GHz | 2.500 GHz | 100 MHz | 2.450 GHz | |
| 5.725 GHz | 5.875 GHz | 150 MHz | 5.800 GHz | |
| 24.000 GHz | 24.250 GHz | 250 MHz | 24.125 GHz | |
| 61.000 GHz | 61.500 GHz | 500 MHz | 61.250 GHz | Subject to local acceptance |
| 122.000 GHz | 123.000 GHz | 1 GHz | 122.500 GHz | Subject to local acceptance |
| 244.000 GHz | 246.000 GHz | 2 GHz | 245.000 GHz | Subject to local acceptance |
Regulatory authorities may allocate other parts of the radio spectrum for unlicensed communication systems, but these are not ISM bands.
Read more about this topic: ISM Band
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