ISM band

(redirected from 2.4 GHz)

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)
Copyright © 1981-2019 by The Computer Language Company Inc. All Rights reserved. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction is strictly prohibited without permission from the publisher.
References in periodicals archive ?
8TR1215 is 2.4 GHz PA with RX Bypass and the world's first BT/BLE RF front-end IC designed for 1.8V supply voltage with low current consumption consuming less than 1 [micro]amp in bypass mode.
The M300XL smart glasses for enterprise include upgraded 2.4 GHz Wi-Fi for better network performance and roaming support.
M2 EQUITYBITES-December 26, 2018-Globalstar gets approval of band 53 for 2.4 GHz terrestrial spectrum
TELECOMWORLDWIRE-December 26, 2018-Globalstar gets approval of band 53 for 2.4 GHz terrestrial spectrum
The -10 dB simulated return loss bandwidths cover ISM 2.4 GHz and 5.8 GHz bands.
The EMG6765-Q10A, which provides concurrent data transfer rates of 450 Mbps at 2.4 GHz and 1,733 Mbps at 5 GHz, features TR-069 and TR181 standard support for remote management and extensive WiFi diagnostics enabling service providers to offer and profit from premium managed WiFi services.
Aerohive's AP250 and AP550 have both 802.11ac 5 GHz fixed and software-definable radios that can transmit on either the 2.4 GHz or 5 GHz band.
To improve the amplitude balance of the two output ports at 5.9 GHz, another two small symmetry rectangular slots are loaded on the other diagonal slot, and a current gap is constructed to furthermore adjust the amplitude balance of 2.4 GHz on top side of the patch.
In the following discussions, three [lambda]/50-length electric dipoles are placed on an infinite magnetic wall, and the distance between the dipoles and the magnetic wall is 0.05 [lambda], where [lambda] is the free-space wavelength corresponding to 2.4 GHz. The three electric dipoles, Dipole 1, Dipole 2, and Dipole 3, are corresponding to C1, C2, and C3, respectively.
Table 1: ZigBee Specifications Specification Value Transmission Frequency 868 MHz (EU), 915 MHz (US) and 2.4 GHz (World) Power Output 1 - 100 mW Data Transfer Rate 250 Kbps RF Modulation Gaussian Frequency Shift Keying (GFSK) Encryption 128-bit AES Frequency Hopping Direct Spread Spectrum Table 1: ZigBee Specifications.
The 879 is an AC 1900 router that offers 1,300 Mbps on a 5 GHz band and 600 Mbps on the 2.4 Ghz band.