Title :
Humidity Sensing by Polymer-Loaded UHF RFID Antennas
Author :
Manzari, Sabina ; Occhiuzzi, Cecilia ; Nawale, Shankar ; Catini, Alexandro ; Natale, Corrado Di ; Marrocco, Gaetano
Author_Institution :
Dept. of Comput. Sci. & Syst., Univ. of Rome Tor Vergata, Rome, Italy
Abstract :
Passive ultra high-frequency radio frequency identification tags, besides item labeling, are also able to exploit capability to sense the physical state of the tagged object as well as of the surrounding environment. Here, a new family of polymer-doped tags are proposed and fully characterized for the detection of ambient humidity. A sensitive chemical species based on PEDOT:PSS is used to load a shaped slot, carved into a folded-like patch tag. The communication and sensing capabilities of the resulting radio-sensor are investigated by means of simulation and measurements that show how to control and balance above opposite requirements by a proper deposition of the sensitive material. The device could have interesting applications in the assessment of the air quality within living and controlled rooms, in the monitoring of the conservation state of foods, in the preservation of walls, and even in the medical field, e.g., to monitor the healing of wounds.
Keywords :
UHF antennas; humidity sensors; microstrip antennas; polymers; radiofrequency identification; PEDOT:PSS; UHF antenna; ambient humidity detection; folded like patch tag; humidity sensor; passive RFID tag; polymer doped tag; radio frequency identihcation; radio sensor; sensitive chemical species; Antenna measurements; Antennas; Humidity; Polymers; Radiofrequency identification; Humidity; PEDOT:PSS; polymer; radio frequency identification (RFID); sensor;
Journal_Title :
Sensors Journal, IEEE
DOI :
10.1109/JSEN.2012.2202897