Development of a low‐cost backscattered semi‐active RFID tag at 2.4 GHz

The development of a low‐cost backscattered semi‐active Radio Frequency Identification (RFID) tag that works in 2.4 GHz frequency band is presented in this study. The tag comprises of an annular ring slot antenna, a feed with a matching network, a Schottky diode modulator and a microcontroller with an in‐built oscillator. The tag is powered by a 3 V pill‐box battery and uses amplitude shift keying (ASK) modulation to communicate its identity to the tag reader. Results presented include the performance of the slot antenna, the feed network, the associated software and identification of the tag in real time by a Hyper‐X® reader. © 2007 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2007.     

RFID Transponders

adio frequency identification (RFID) or auto-identification (ID) is a contactless data transmission and reception technique between the data carrying device, called a transmitter responder (transponder) or an RFID tag, and an interrogator, which is also known as an RFID reader. A more abstract approach to defining Auto-ID reveals that Auto-ID involves the automated extraction of the identity of an object [1], [2]. The contactless ID system relies on data transmission via radio frequency electromagnetic (EM) signals, and consequently, the whole operation is line-of-sight and weather independent [3]. These advantages overcome the limitations of optical barcodes, which are line-of-sight and weather dependent and need manual operation.