Passive
–Passive tags reflect and modulate radio waves received by the tag from the interrogator (reader).
–Passive devices have ranges of 0.1 to 4 meters depending upon regulations
–Passive tags do not require an on-board power source, but some have batteries to support sensors and faster response times.
•Active
–Transmit an RF signal (instead of reflecting the signal)
–Have longer range than passive tags, from 10cm to 100m
–Have batteries, and compared to passive tags are:
•Larger
•More expensive