Multi-Bit Passive RFID Tag Design using Concentric Rectangular Strip Resonators for 2.4 GHz and 5.8 GHz ISM Band

This paper presents chipless radio frequency identification (RFID) tags based on concentric rectangular strip resonators (CRSRs). The 6-bit compact CRSR-based tag with a physical size of 39 mm × 20 mm resonates at 2.4 GHz and 5.8 GHz industrial scientific medical (ISM) bands, hence suitable for biomedical scenarios. The resonant peaks of this 6-bit tag make it well-suited for on-body applications. The resonant structure is implemented on a low-cost FR4 substrate material of dielectric constant and loss tangent values of 4.4 and 0.02, respectively. In addition, an approach has been discussed using Kalman filtering, one of the noise reduction algorithms for the efficient detection of radar cross section (RCS).