Abstract
This letter presents significant improvement in robustness and recognizability of radar cross section (RCS) response of the two topologically rearranged 20-bit U-shaped strip-based tags for spectral signature-based chipless RFID systems. The space rearrangement of individual tag scatterers in the array reduces the interelement mutual coupling and, thus, significantly enhances the frequency and amplitude robustness of their RCS. In comparison to the original arrangement of scatterers, the measurement of tags designed for 2–4-GHz frequency band showed a significantly improved homogeneity of the RCS curve, which results in a more reliable recognition of coded information.
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