Abstract:
The research presents a new, fully passive, data-dense, and compact 15×15mm2 chipless radio
frequency identification (RFID) tag. The proposed design is able of encoding 15-bits
information, meaning it is capable of generating 215=32,768 different ID combinations due to
which it can be used for tagging numerous items. This tag is able of yielding bit density of
6.67bits/cm2 within a compact area. The advised RFID tag inheres a butterfly-shaped structure
comprising fifteen slots/resonators, energized by linearly polarized electromagnetic (EM) waves.
Different flexible substrates, i.e., Rogers(RT/duroid®/5880), Kapton® HN, PET, and HP Photo
Paper are used for analyzing the tag design and their response as radar cross-section (RCS) is
observed. Moreover, this RFID chip is also designed by utilizing silver nanoparticle-based
conductive ink on the HP Photo paper substrate due to which the tag behaves as a humidity
sensor. Silver nanoparticle-based ink results in easy printing of the tag along with abundantly
available paper substrate supports the concept of green electronics. In view of the appealing
attributes of the tag like strength, flexibility, simple printing, and need of budget friendly
extensible substrates it can be located over rough places to execute sensing.
