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A novel RFID tag employing open-loop resonators is presented in this paper. The resonators have been synthesized using coupled microstrip transmission line. The complete design consists of open-loop resonators based tag, and cross polarized circular patch antenna for transmitting and receiving purpose. The design of 8-bit data encoded tag and the antennas have been prototyped on Rogers 5880 substrate having dielectric constant of 2.2 and loss tangent of 0.0009 for the frequency band between 3.3 GHz and 5.8 GHz. The measured results show a very good performance in the detection of all the 8 bits.