ISM band


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ISM band

(Industrial, Scientific and Medical band) A part of the radio spectrum that can be used for any purpose without a license in most countries. In the U.S., the 902-928 MHz, 2.4 GHz and 5.7-5.8 GHz bands were initially used for machines that emitted radio frequencies, such as RF welders, industrial heaters and microwave ovens, but not for radio communications.

In 1985, the FCC Rules (Part 15.247) opened up the ISM bands for wireless LANs and mobile communications. In 1997, it added additional bands in the 5 GHz range under Part 15.407, known as the Unlicensed National Information Infrastructure (U-NII). Europe's HIPERLAN wireless LANs use the same 5 GHz bands, which are titled the "Broadband Radio Access Network."

Numerous applications use the ISM/U-NII bands, including cordless phones, wireless garage door openers, wireless microphones, vehicle tracking and amateur radio. See U-NII.
                      Power LimitISM Bands               (Watts)902 - 928 MHz
   Cordless phones          1 W
   Microwave ovens        750 W
   Industrial heaters     100 kW
   Military radar        1000 kW

   2.4 - 2.4835 GHz
   Bluetooth              100 mW
   Wi-Fi - 802.11b/g        1 W
   Microwave ovens        900 W

   5 GHz
   5.725 - 5.825 GHz        4 W
   Wi-Fi - 802.11a/n/ac


   U-NII 5 GHz Bands
   Wi-Fi - 802.11a/n

   5.15 - 5.25 GHz        200 mW
   5.25 - 5.35 GHz          1 W
   5.47 - 5.725 GHz         1 W
   5.725 - 5.825 GHz        4 W


   60 GHz Band
   57 - 64 GHz (see  WirelessHD and  WiGig)
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References in periodicals archive ?
Open-standard protocols and proprietary protocols exist for all of the ISM bands. If interoperability between transceivers from different manufacturers is a concern, an open-standard protocol must be considered.
In order to compare with theory, some measurements in the 2.45 GHz ISM band are also presented in Fig.
Unlike the standards specific to ISM bands which target short distance transmission, these standards are used in cellular phone networks, which represent much longer distances.
Bluetooth LE uses the same 2.4 GHz ISM band radio frequencies as Classic Bluetooth.
Analog Devices offers a broad portfolio of RF ICs covering the entire RF signal chain, from industry-leading high-performance RF function blocks to highly integrated ISM band and wideband single-chip transceiver solutions.
These protocols offer means of secure communication between device, and typically operate in the 2.4GHz ISM band using combination of frequency shift keying (FSK), phase shift-keying (PSK), and amplitude shift keying (ASK).
The RF5602 is also applicable for 2.4 GHz ISM band applications, PCS communications systems, and WiBro 2.3 GHz - 2.4 GHz applications.
* The DR9011/DR9021 point-to-point system with a choice of 3 radio frequencies; 2 in the 915 MHz ISM band and 1 in the 2.4 GHz band.
OS-Gemini is an intelligent broadband wireless Ethernet bridge that offers true non-line-of-sight coverage in the license-exempt 5.8-GHz ISM band. The system provides a secure point-to-point broadband link to connect separate networks for up to six miles where obstacles such as trees and buildings prevent a direct line-off-sight connection.
These RF building blocks provide a degree of design flexibility that allows a wide range of 802.11b compliant and non-compliant 802.11 systems in the unlicensed 2.4 GHz ISM band, as well as WLAN, WLL and PC card moderns.
Ericsson's Wireless LAN products operate in the license free 2.4 GHz ISM band, and use a Frequency Hopping Spread Spectrum radio technique, FHSS, allowing quick and easy, smoothly scalable installations.