A Study on Chipless RFID Tag Structures

RFID has become an active research topic for the past few years and has been extensively used in various applications. This paper reviews on different types of Chipless RFID system and it’s advantages. Chipless RFID was introduced to compete with conventional methods such as optical barcodes in terms of cost. Cost reduction can be achieved in RFID tag systems by elimination of chip from tags and they are replaced by metal structures which utilises electromagnetic signature for data encoding. Major issues to be considered while designing a tag are size, coding capacity, capability of being printed economically, polarization and angle of incidence effects. This paper mainly focuses on various chipless RFID tag structures based on frequency domain techniques.