The Industrial, Scientific, and Medical (ISM) band is divided into several frequency ranges that are designated for unlicensed use across various applications. These ranges are primarily categorized based on their frequency allocations and regional regulations. The most commonly recognized ISM bands include:
- 13.56 MHz: Widely used for RFID, NFC, and wireless audio devices.
- 27 MHz: Historically used for CB radios and some remote controls.
- 433 MHz: Commonly employed in remote keyless entry systems, RFID, and wireless sensors.
- 902–928 MHz: Predominantly utilized in North America for RFID, wireless microphones, and other short-range communication devices.
- 2.4 GHz: One of the most globally used ISM bands, supporting Wi-Fi, Bluetooth, microwave ovens, and other wireless technologies.
- 5.8 GHz: Used for Wi-Fi, cordless phones, and other high-frequency wireless communications.
In summary, the ISM band encompasses at least six primary frequency ranges, each serving different technological applications. The specific number of ranges may vary depending on regional regulations and definitions but generally includes these key segments.
- ISM Band Frequency Ranges: The ISM band is divided into several frequency ranges, each designated for unlicensed use and differing based on regional regulations.
- 13.56 MHz Use Cases: This frequency is commonly used for RFID, NFC, and wireless audio devices.
- Historical and Regional Usage of 27 MHz: Historically employed for CB radios and remote controls, mainly in certain regions.
- Applications of 433 MHz and 902–928 MHz: These bands are used in remote keyless systems, RFID, wireless sensors, and short-range communication devices, particularly in North America.
- Global and Regional Use of 2.4 GHz and 5.8 GHz: These high-frequency bands support Wi-Fi, Bluetooth, microwave ovens, and other wireless technologies worldwide.
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