Abstract
A novel Radio Frequency Identification (RFID) based sensor supporting touch detection and localization features is proposed in this work. The formulated sensor leverages chipless variant of RFID technology for the design of a passive fully-printable frequency domain-based sensor-incorporated tag. The sensor is composed of square resonators arranged in a peculiar fashion laid down across a $3\times2$ grid. The proposed sensor incorporated-tag readily keeps track of human-digit position, allowing for tracking of finger-swipes which, in turn, can potentially be used for recognition of unlock patterns and security codes. Performance of the sensor is analyzed using its Radar Cross Section (RCS) response observable in the spectral domain. Each constituent resonant-element making up the sensor resonates at a single frequency represented by a distinct dip in the RCS response. The spectral dip drifts well outside of its allocated band upon occurrence of a touch event. A functional prototype of the sensor tag is fabricated on a 0.508 mm thick Rogers RT/Duroid ® 5880 laminate is scrutinized of its electromagnetic performance. The sensor possesses a compact physical footprint equal to 45 mm $\times55$ mm. The obtained results solidify the suitability of the proposed sensor for deployment in secure access control settings prevalent in smart cities and connected home applications.
Highlights
Modern-day research efforts are extensively focused on developing low-cost solutions for wireless sensing due to a pronounced shift towards pervasive computing
Active and semi-passive tags require batteries for their operation whereas passive tags are essentially battery-less in their construction. Both semi-passive and passive tags operate on the principle of backscattering, and energization of the tag itself depends upon the electromagnetic waves originating from the reader
We propose a chipless data encoding circuit that has been repurposed [19] for detection and localization of human touch events
Summary
Modern-day research efforts are extensively focused on developing low-cost solutions for wireless sensing due to a pronounced shift towards pervasive computing. The proposed sensor-incorporated tag is capable of detecting instances of single-touch events at six distinct locations in full-wireless mode. The proposed tag operates by recording disappearance of resonant dips in the spectral response.
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