Touch Gesture Recognition using Chipless RFID Technology

This paper deals with a novel RFID-based sensor reinforcing touch gesture recognition initiated. The developed sensor takes dominance over an RFID chipless variant that enables the fabrication of an inactive, fully-printable tag with an incorporated frequency domain-based sensor. The sensor consists of four rhombus-shaped resonators that are strangely distributed in four corners of the geometry. The suggested sensor-incorporated tag accurately tracks the position of human digits, allowing surveillance of finger swipes that may then be utilized to identify unlock sequences and security codes. Its performance is evaluated using the sensor's Radar Cross Section (RCS) response, which may be seen in the spectral domain. The response of RCS clearly shows a dip in frequency where each unique resonating element of the sensor resonates. The spectral dip floats far beyond the associated band when a touch event occurs. On a 0.76 mm thick Rogers RT/Duroid®5880 laminate, a functioning iteration of the sensor tag is made, and its electrostatic performance is evaluated in the meantime. The sensor observes a modest physical footprint with dimensions of 45 mm by 55 mm. The acquired results support the suggested sensor's viability for use in access control and authentication applications.