Title :
Printed humidity sensor for UHF RFID systems
Author :
Virtanen, Juha ; Ukkonen, Leena ; Björninen, Toni ; Sydänheimo, Lauri
Author_Institution :
Dept. of Electron., Tampere Univ. of Technol., Rauma, Finland
Abstract :
This paper presents a printable humidity sensor for RFID systems at UHF frequencies. The sensor is printed onto Kapton HN polyimide substrate using silver ink. The sensor measures humidity capacitively through the permittivity change in the polyimide. The actual measurement result is acquired from the tag using a threshold power sweep performed by the reader device. The operation principle is explained and simulation results are shown. Simulation results predict good sensor performance and thus the sensor is ready for the prototype stage.
Keywords :
UHF detectors; humidity measurement; humidity sensors; permittivity; polymers; radiofrequency identification; Kapton HN polyimide substrate; RFID tag; UHF RFID system; humidity measurement; permittivity; printed humidity sensor; reader device; silver ink; threshold power sweep; Capacitive sensors; Frequency; Humidity; Ink; Permittivity measurement; Polyimides; Radiofrequency identification; Sensor systems; Silver; UHF measurements;
Conference_Titel :
Sensors Applications Symposium (SAS), 2010 IEEE
Conference_Location :
Limerick
Print_ISBN :
978-1-4244-4988-0
Electronic_ISBN :
978-1-4244-4989-7
DOI :
10.1109/SAS.2010.5439426
