Open loop multi-resonator based chipless RFID tag

A simple, compact, planar open loop multi-resonator for chipless RFID tag with high quality factor is presented. It is a spectral signature based chipless RFID transponder. It consists of a set of cascaded open loop resonators. The prototype fabricated on a substrate of dielectric constant 3.7 and thickness 1.6mm is having an overall dimension of 28×13.2 mm 2 . The application of the proposed circuit together with its cross-polarized transmitting and receiving microstrip ultra-wideband disc loaded monopole antennas for RFID transponder system is also verified. The proposed circuit can be used for near filed identification and security systems.