hassam
Types Of RFID Tags
October 25th 2011 05:13
Passive RFID Tag
Recently I had chance to work in a RFID project, which allowed me to post some basic stuff about RFID here in my blog too. RFID is a promising technology, which has its origin dating back to 1945.
Radio frequency spectrum is quite an old phenomenon which was already applied in conventional radio years back. But no one knew what wonders we can achieve with this spectrum.
RFID stands for Radio Frequency Identification, it consists of two main components, namely an Interrogator and the Transponder. The Interrogator is actually a scanning device just like barcode scanner, which can scan the different RF tags from a particular distance.
The Interrogator consists of an RF transceiver which, sends and receives data on free ISM band. The Interrogator is typically connected to a computer database where real time updates are made to a database.
The RFID tags called the transponder are of two types:
1. Active Tags
Active tags are really promising for the reason that they can be scanned from a large distance which can be more than 100 meters. That is why they have been popular in applications like toll charging on free ways and highways. But its draw back is that it requires a battery to remain active, however it allows us to send and receive data without communication being initiated from the Interrogator.
2. Passive Tag
Passive tags are the more widely used ones mainly because they are extremely compact and that they are comparatively cheaper than active tags. This allows them to be suitable in inventory management systems, where they can be effectively placed on hundreds of items, for Asset tracking. Passive Tags work when an Interrogator initiates communication my sending an RF signal which hits the tag and makes it active to send back the data it has stored . It has a typical range of upto 5 meters.
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