Design of a Multi-bit Chipless RFID Tag using Square Split-ring Resonators

The importance of radio frequency identification (RFID) is prominent in this advanced technological era. Here a passive 3-bit RFID tag is presented for retail, biomedical as well as industrial applications. This tag is based on square split-ring resonator (SRR) concept. Here a new approach is presented by taking three coplanar rectangular split-ring resonators which perform as per expectation. The performance characteristics are obtained through design and simulation using CST Microwave Studio and validated through measurements. Based on measurement results, the tag can provide a maintenance-free environment for wireless applications, viz. goods tracking, identity detection, and health monitoring.