RFID a short introduction

Radio Frequency Identification (RFID) as the name sugests this technology is basicaly based on the power of Radio waves ie there ease of use and data carrying ablity. 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.

How it works - Basicaly there are two different parts First is the transpondera(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 transmiting Radio waves which are used to comunicate and power up by the RF Tag (incase of Passive Tags).

The Tag contains the data and the reciver is basicaly like an antena which is conected to some sort of controler to which it transmits the data.

RFID can be largly calssified 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 powerfull. The range of these tags increases dramaticaly.

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

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

For more info you can log on to www.insigniasecure.com

i`m working in RFID Technolgy for insignia security systems in India. In this article i`m trying to present a simple introduction to RFID.