RFId, Radio Frequency Identification

RFID deployments tend to use unlicensed frequencies for their obvious cost benefits. There are four commonly used frequencies: low frequency (LF) 125/134.2 KHz, high frequency (HF) 13.56 MHz, ultra high frequency (UHF) (including 869 and 915 MHz) and microwave (at 2450 MHz, a band familiar to ISPs).