Radio-frequency identification (RFID) is a technology for reading information from a distance from the transponder memory that are called RFID-tags.
The cheapest and easiest variants have a very simple structure and consist only of a unique number that they can send out for a distance of a few decimeters. This is the most common variety used today. In this type of RFID transponder has all of the information stored in a database. The record where information is stored is tied to the unique id. This simple type correspond to de facto standard barcodes. In the next price level, there are little more advanced tags having an internal memory that can be rewritten multiple times, but the memory is quite limited. The reader consists of an oscillating magnetic field inducing a sufficient voltage to the antenna for the tag to send its content. Such a tag can be small enough to be inserted under the skin of an animal, or surgically inserted into people for the identification using radio waves.
The tags mentioned so far were passive but there are also active tags. The active are distinguished by having its own energy source, unlike the passive, they do not depend on the reader energy. They are also physically larger and much more expensive. The active tags are used to communicate over large distances, such as in a container at a port. Continue reading “Research Paper on Radio Frequency Identification”