The Radio-Frequency IDentification, commonly known as RFID, is used in many applications. The use of this
technology is constantly evolving, expanding at exponential rate. There are several methods of identification,
although the most common is a microchip able to store a serial number that identifies the person, object or thing.
Using electronic devices that emit radio frequency signals, it is possible to perform an automatic capture of data, or a
tag, from a reader. Although it depends on the type of tag, passive or active, RFID is an easy-to-use and versatile
acquisition information technology, where a radio signal is used to get data from transponders (e.g. tags) into the
target application. Apart from the tags there is also the need for procedures to read or interrogate these tags (e.g.
readers, antennas) in order to transmit the data [4] to a host system where it is further processed. The main advantage
of using RFID is the possibility of reading without physical contact,being that the production price of tags has been
heavily declining over the years. One can put the tag inside a product and read it without unpacking [5] or even
implant it under the skin of a patient [6] and read it from outside, even if it is moving.