Orientation Independent, Polarization Insensitive High-Density Flexible Chipless RFID Tag for IoT Applications

A regular shaped octagonal flexible chipless Radio Frequency Identification (RFID) tag is proposed for Internet of Things (IoT) applications. The expressed flexibility leverages a chipless passive RFID technology to design a fully printable frequency-based tag. The regular octagonal shape of the proposed tag verifies its orientation independence and polarization insensitivity. The Radar Cross Section (RCS) response in the spectral domain examines the proposed tag’s performance. The maximum dimension of the proposed tag is 21 x 21 mm, which covers the maximum number of fifteen bits. The proposed octagonal tag has more bit density of 3.4 bits/cm ² and a spectral bit density of 2.61 bits/GHz than the already published octagonal tags, which showed the proposed tag’s novelty. The proposed design can work for bits shifting, higher to lower or lower to a higher frequency. The covered bits lie in a UWB band range show the suitability for future medical and sensor applications.