Dual-polarized data dense chipless RFID tag towards IoT applications

This research article proposes a novel, low-cost, dual-polarized slot/resonator based structure. The tag has a triangular geometry and is designed within a miniaturized footprint of 29 × 29 mm². The proposed tag is capable of transmitting 38-bit data; which depicts that 2³⁸ number of different objects/items can be tagged. The tag is arranged in such a manner that each slot i.e., (metal gap) corresponds to a resonance dip or a logic state ‘1' in the radar cross-section (RCS) curve. Similarly, a shorted/removed slot corresponds to a logic state ‘0’. The tag has been realized for rigid as well as flexible substrates which include, Rogers RT/duroid^®/5880, Rogers RT/duroid^®/5870 (flexible) and Taconic TLX-0 with copper as the radiating material. The frequency range for Rogers RT/duroid^®/5880 is 4.61–14.6 GHz, for Rogers RT/duroid^®/5870 (flexible) is 4.7–14.8 GHz and is 4.6–14.5 GHz for Taconic TLX-0 substrate. Hence, the compact, flexible and high data dense passive chipless radio frequency identification (RFID) tag can be deployed in various businesses and internet of things (IoT) based smart applications.