� Wireless LANs: IEEE 802.11b operates at 902 � 928 MHz and 2400 � 2483 MHz, and the industrial, scientific, and medical (ISM) radio bands operate at 2.4 GHz in the United States. The IEEE 802.11b operates at 2400 � 2483 MHz in Europe, and at 2400 � 2497 MHz in Japan. IEEE 802.11a and HiperLAN2 use 5150 � 5350 MHz and 5725 � 5825 MHz, and the unlicensed national information infrastructure (U-NII) band operates at 5.8 GHz in the United States. They operate at 5150 � 5350 MHz and 5470 � 5725 MHz in Europe, and at 5150 � 5250 MHz in Japan.
� Bluetooth: A total of 79 1-MHz channels are allocated from the unlicensed 2.402 �2.480 GHz in the United States and Europe for Bluetooth signal transmission. Other countries may have fewer channels but all fall into the 2.4-GHz band.
� WiMax: A wide range from 2 to 11 GHz that includes both licensed and unlicensed bands will be used for 802.116a, and from 11 to 66 GHz can possibly be used by 802.116c.
� Ultra-wideband (UWB): In the United States, the FCC mandates that UWB can operate from 1.1 to 10.6 GHz.
� Radio-frequency identification (RFID): RFID tags operate at the frequency bands of LF (120 � 140 KHz), HF (13.56 MHz), UHF (868 � 956 MHz), and microwave (2.4 GHz).
� IrDA: IrDA uses frequencies around 100 GHz for short-range data communication.
� Wireless sensors: Sensor motes support tunable frequencies in the range of 300 to 1000 MHz and the 2.4-GHz ISM band. In particular, ZigBee, the remote sensor control technology, operates at the 868-MHz band in Europe, 915-MHz band in the United States and Asia, and 2.4-GHz band worldwide.
Source of Information : Elsevier Wireless Networking Complete 2010