Basic RFID

Radio Frequency Identification (RFID) as the name suggests this technology is basically based on the power of Radio waves ie there ease of use and data carrying ability. Mario Cardullo's U.S. Patent in 1973 was the first true ancestor of modern RFID which tells us that it is a young technology.

(The Pic. is of what RFID tags look like)

How it works - Basically there are two different parts first is the transponder (tag) the other is the receiver. These two are a slightly confusing words as the receiver which receives data from the RF tag is the one which is transmitting Radio waves which are used to communicate and power up by the RF Tag (incase of Passive Tags).

The Tag contains the data and the receiver is basically like an antenna which is connected to some sort of controller to which it transmits the data.

RFID can be largely classified into two types 1) Passive 2) Active

Passive RFID tags have no internal power supply. They rely for power on the incident RF waves for power, the tags convert the RF waves into power with the help of a coil, this is then used to transmit back the data in the chip to the reader using what is know as backscattering

Active RFID tags have batteries inside them and this makes them more reliable and more powerful. The range of these tags increases dramatically.

The Problems faced by RFID is that radio waves cannot travel through metal, also radio waves find it hard to travel through water.

RFID can be used for a lot of application from complete inventory system management, to college management.

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