The RFID Antenna is the last of the three necessaray components (the other two we already discussed -- the RFID reader and the RFID tag).

To put it simply, the RFID antenna is what "connects" the tag to the reader.  When a tag passes by the reader it is the antenna that transmits the tag's signal to the reader.

There are a few different types of antennas.  Linear antennas are used if the tags always pass by the reader in the same way.  Circular antennas are used if the orientation of the tag cannot be controlled.

So, now we have covered the three necessary components of an RFID system.  We'll talk about some other add-on components such as RFID portals, software and RFID printers in upcoming blogs.