A humidity sensor for passive chipless RFID applications
- 1 November 2012
- conference paper
- conference paper
- Published by Institute of Electrical and Electronics Engineers (IEEE)
Abstract
This paper proposes for the first time, a group delay based humidity sensor for chipless RFID applications. The sensor network consists of cascaded group of microstrip transmission line sections coupled at alternative ends. Silicon nanowires are deposited on the transmission line sections. The nanowires are extremely sensitive to humidity variations, which make it a good candidate for sensor applications. The sensor shows a very good sensitivity to humidity in phase and group delay at a bandwidth of 750 MHz from the fundamental frequency and a very good reversibility is also achieved. The variation of phase and group delay in accordance with the humidity absorption is explained for a single group of C-sections. A proof of concept is developed for the prototype and is validated using measurement results. Moreover, measurement for a temperature variation of ±10°C was also performed and no significant variation was observed. The obtained results confirm the robustness of these kinds of tags in humidity sensor application.Keywords
This publication has 6 references indexed in Scilit:
- Temporal multi-frequency encoding technique for chipless RFID applicationsPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2012
- A compact chipless RFID tag with environment sensing capabilityPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2012
- Chipless RFID based on group delay encodingPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2011
- A Novel Conformal RFID-Enabled Module Utilizing Inkjet-Printed Antennas and Carbon Nanotubes for Gas-Detection ApplicationsIEEE Antennas and Wireless Propagation Letters, 2009
- A Chipless RFID Sensor System for Cyber Centric Monitoring ApplicationsIEEE Transactions on Microwave Theory and Techniques, 2009
- Investigation of capacitive humidity sensing behavior of silicon nanowiresPhysica E: Low-dimensional Systems and Nanostructures, 2009