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Friday, July 23, 2010

How RFID works?

A Radio Frequency Identification (RFID) is a technology, which is used for identifying the object using an RFID tag. Generally, the objects or the products to which the RFID tags are connected are the animals, persons, vehicles etc. The identification of the above is done using the radio waves. The waves are transmitted throughout and the tag can detect the presence of the object.

Some of the tags are used for identifying the object even if they are out of sight. Unlike barcodes, they do not require any orientation. If the object is at a far place from the tag; the tag can read the information of the object.


Working of the RFID: For the simplest RFID system, a product tag is attached to the object which needs the identification. The product tag is made of a small chip with a tiny antenna. The tag reader which is associated emits the electromagnetic waves. Those electromagnetic waves are received by the antenna and the chip gets the power from the field which is being generated by the reader. The reader signals are modulated and the digital data is sent back.


The electromagnetic waves which are produced are not harmful. There are various types of RFID tags. Suppose, consider the case of manufacturing, each of the goods consists of RFID tag which contains a unique electronic code called as the Global Trade Identification Number (GTIN), and a serial number which is used or identifying the good. Once the goods are dispatched from the factory the RFID readers read the tag and verify whether all the products are delivered to the dealer or not. Once the goods are at the warehouse then the tags are read again and the information is sent to the inventory system.

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