There are two types of RFID system such as Electromagnetic induction type and Radio wave type.
Frequency of Electromagnetic induction type is primarily HF band (13.56MHz), and electromagnetic waves from coil antennas of reader writer is received by the tag’s coil antennas, and obtain the operating power of the tag ICs.
Radio wave type (primarily UHF-band) will receive the radio wave, radiating from reader writer antenna to space, by the tag antenna.
From such view point that both type can receive the operating power from the reader writer and respond back the received signal (command) , they are almost the same.
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