Antônio Scarpinetti/Ascom/UnicampDevice developed at Unicamp has a read range of more than 8 metersAntônio Scarpinetti/Ascom/Unicamp
A radio frequency identification tag (RFID) that operates in the ultra high frequency band (UHF) and can be attached to metallic objects – such as plates, tubes, or containers – has been developed at the School of Electrical and Computer Engineering at the University of Campinas (Unicamp), during the master’s research of engineer Manoel Barbin, advised by Michel Daoud Yacoub. The tag can be read from more than 8 meters away, a parameter not always achieved by its commercially available counterparts. Conventional smart tags are composed of an electronic circuit for information storage and an antenna, and are widely employed in industrial and logistic applications. However, they encounter problems when reading metallic objects at UHF frequencies because the metal interferes with that type of wave. The tag developed at Unicamp was designed using a new method to feed the radio frequency signal that connects the integrated circuit to the data transmitting and receiving antenna. “The feed line goes through a slot in the antenna’s radiating element,” says Barbin. He believes that the new method facilitates assembly of the tag during manufacture.
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