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the design of a sewed chipless RFID tag and sensor, on a fabric for wearable applications. The proposed design is based on three sewn scatterers on cotton textile. The tag is realized using a computer-aided sewing machine and electro-thread plated with silver. The simulation and frequency-domain measurement results validate the design from 3 to 6 GHz. The tag's static backscattered response can be identified in free space and on the human body. Some preliminary results from a sewn stretchable sensor are also given to demonstrate the potential for biomedical applications. Finally, we discuss the main challenges concerning the practical implementation of this technology.
This scatterer has been optimized around the center operating frequency of 4.5 GHz based on length, width strip, height of the diamond-shape ring and central strip spacing. The conductivity value used in the simulated model for the chosen sewing pattern shown in Fig. 2 (c) is 3000 S/m for a thickness of 100 μm. As a result, a resonant peak with a RCS close to -25 dBsm and a 3 dB bandwidth of 400 MHz are obtained, which is a quite satisfactory performance considering the low conductivity value of the strips.
