Design of Frequency-Signature Based Multiresonators Using Quarter Wavelength Open Ended Stub for Chipless RFID Tag

A quarter wavelength open stub multiresonators are proposed for chipless Radio Frequency Identification (RFID) tag. The data capacity of the tag is 10 bit and open stub resonator operates in the frequency band of 2 GHz to 4 GHz. The data in the tag is encoded using absence or presence coding and frequency shift coding (FSC). The data stored is read and transmitted using the planar circular patch monopole ultra-wide band (UWB) antenna. The tag consists of two cross polarized sending and receiving planar circular patch (PCP) monopole UWB antennas connected to the multiresonators. The span of the multiresonator based chipless RFID tag is 23.8mmx17mm which is designed on FR4 substrate with dielectric permittivity of 4.4 and tangent loss of 0.01. It is designed and tested under simulation using ADS software and the vector network analyzer (VNA) after fabrication. The tag has the insertion loss in the range of -10 dB to -30 dB and a bit density of 2.47bits/cm
²
.