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

fYear

2014

fDate

6-11 July 2014

Firstpage

1612

Lastpage

1613

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Antennas and Propagation Society International Symposium (APSURSI), 2014 IEEE

Conference_Location

Memphis, TN

ISSN

1522-3965

Print_ISBN

978-1-4799-3538-3

Type

conf

DOI

10.1109/APS.2014.6905132

Filename

6905132