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Low-cost inkjet-printed fully passive RFID tags for calibration-free capacitive/haptic sensor applications

Research output: Contribution to journalArticleScientificpeer-review


Original languageEnglish
Article number6945328
Pages (from-to)3135-3145
Number of pages11
JournalIEEE Sensors Journal
Issue number6
Publication statusPublished - 1 Jun 2015
Publication typeA1 Journal article-refereed


A fully passive, compact, and low-cost capacitive wireless radio frequency identification (RFID)-enabled sensing system for capacitive sensing and other Internet of Things applications is proposed. This calibration-free sensor utilizes a dual-tag topology, which consists of two closely spaced RFID tags with dipole antennas and printed capacitive sensor component connected to one of the tags. A series LC resonator is used to both reduce the antenna size and improve the isolation between the two antennas and the design/optimization steps are discussed in detail. All components except for the RFID chips are inkjet printed on an off-the-shelf photopaper using a silver nanoparticle ink. The complete sensor dimension is 84mm × 95mm and the sensor is compatible with EPC Class 1 Gen 2 (UHF) standard reader technology at 915 MHz.


  • Capacitive sensing, cross-talk suppression, differential sensing, haptic sensors, inkjet-printing technology, Internet of Things (IoT), remote sensing, RFID, RFID-enabled sensor, wireless sensors