What is RFID Tags
What is RFID Tags?
RFID tags are made up of an integrated circuit (IC), an antenna and a substrate. The part of an RFID tag that encodes unique identification information is called the RFID inlay. But the tags that are used in some special fields will made with PCBs or Ceramic chips instead of RFID inlays.
There are two main types of RFID tags:
- Active RFID. Active RFID tags have their own power source for driving the circuit, normally it is a battery.
- Passive RFID. Passive RFID tags receive their power from the reader antenna, whose electromagnetic wave induces a current in the RFID tag's antenna.
There is another type of RFID tags with a battery which only runs the circuit while communiction is powered by the RFID reader called semi-passive tags.
Low-power, embedded non-volatile memory plays an important role in every RFID system. RFID tags typically hold less than 2,000 Kb of data, including a unique TID/serial number. Tag chips can be read-only or read-write, where data can be added by the reader or existing data overwritten.
The read range for RFID tags varies depends on factors including type of tag, type of reader, RFID frequency range, and interferences in the surrounding environment or from other RFID tags and readers. Active RFID tags have a longer read range than passive ones due to the stronger power source.