Sajitha V R, Nijas C M, Roshna T Kand Mohanan
Cochin University of Science and Technology, India

A compact multi resonator circuit for Chipless rfid tag is presented in this paper. The basic resonator is a shorted λ/4 Stepped Impedance Resonator (SIR). The tag is designed and simulated using High Frequency Structure Simulator and a 6 bit prototype is fabricated on rtduroid(εr=2.2 and tanδ=.0008) Substrate in area of 4.5x2cm2. Data is coded as amplitude variations in the frequency domain. Harmonic separation in the desired band by proper tuning of design parameters and ease of coding by simply adding or removing the shorts are achieved withλ/4 SIR.

Chipless RFID, Multiresonator, spectral signature, stepped impedance resonator