Miniaturized Elliptical Slot Based Chipless RFID Tag for Moisture Sensing

摘要

This paper presents a compact 10-bit chipless radio frequency identification (RFID) sensor tag. The proposed structure has overall size of 22.8 mmx16 mm and possesses the capability of identification of data as well as moisture sensing of the tagged objects. The resonating structure comprises of elliptically shaped slots in a nested loop manner, investigated for three substrates that are Rogers RT/duroid (R)/5880, Taconic (TLX-0) and Rogers RT/duroid (R)/5870. The prototype is fabricated by using Rogers RT/duroid (R)/5880, and moisture sensing is realized by deploying heat-resistant sheet of Kapton (R) HN (DuPontTM) on the smallest slot considered as sensing slot over the aspired frequency spectrum of 3.5 GHz-15.5 GHz. The proposed tag is quite suitable for cost effective applications and can be deployed on the conformal surfaces for identification and sensing purposes.