Title :
Highly sensitive chipless wireless relative humidity sensor based on polyvinyl-alcohol film
Author :
Donghang Lu ; Yuliang Zheng ; Schussler, Martin ; Penirschke, Andreas ; Jakoby, Rolf
Author_Institution :
Inst. for Microwave Eng. & Photonics, Tech. Univ. Darmstadt, Darmstadt, Germany
Abstract :
This paper presents a chipless, highly sensitive, low profile, low cost and easily fabricated passive wireless relative humidity (RH) sensor. The sensor consists of a narrow band loop antenna loaded with PVA film coated interdigital capacitor (IDC) at 2.85 GHz. The RH sensor generates an amplitude peak at resonance in the radar cross section (RCS), which changes with different RH. The sensor is interrogated remotely by a reader antenna, and the measurement results show a good sensitivity up to 5.35 MHz/%RH above 50% RH.
Keywords :
capacitors; humidity sensors; polymer films; radar cross-sections; amplitude peak; frequency 2.85 GHz; highly sensitive chipless wireless relative humidity sensor; interdigital capacitor; narrow band loop antenna; polyvinyl-alcohol film; radar cross section; reader antenna; Antenna measurements; Humidity; Resonant frequency; Sensitivity; Wireless communication; Wireless sensor networks;
Conference_Titel :
Antennas and Propagation Society International Symposium (APSURSI), 2014 IEEE
Conference_Location :
Memphis, TN
Print_ISBN :
978-1-4799-3538-3
DOI :
10.1109/APS.2014.6905132
