A meandered line multi-resonator design is proposed for a chipless Radio Frequency Identification (RFID) tag. The tag is equipped with a set of identical resonant elements and two orthogonally polarized monopole ultrawide band (M-UWB) antennas. The proposed multi-resonator design is realized on an FR-4 substrate (εr = 4.4; tanδ = 0.01) in a surface area of 13 x 17 mm2, occupying a coding density of 4.52 bits/cm2 by encoding 10 bits of data. The bit is encoded using absence/presence coding and frequency shift coding technique. The data can be read and transmitted from the multi-resonator structure through the orthogonally polarized M-UWB antennas operating in the frequency range of 2 GHz to 4.5 GHz. The span of the meandered line multi-resonator design is 13 mm x 17 mm. The tag is designed using ADS software and tested using vector network analyzer (VNA).
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