Humidity passive sensors based on UHF RFID using cork dielectric slabs

Author

Goncalves, Ricardo ; Pinho, Pedro ; Borges Carvalho, Nuno ; Tentzeris, Manos M.

Author_Institution

DETI, Univ. de Aveiro, Aveiro, Portugal

fYear

2015

fDate

13-17 April 2015

Firstpage

1

Lastpage

4

Abstract

In this paper we show the design of passive UHF RFID tag antenna on cork substrate. Due to the cork sensitivity to humidity changes, we can use the developed sensor to sense changes in the relative humidity of the environment, without the need for batteries. The antenna is built using inkjet printing technology, which allows a good accuracy of the design manufacturing. The sensor proved usable for humidity changes detection with a variation of threshold power from 11 to 15 dB between 60 and near 100% humidity levels. Presenting, therefore, reading ranges between 3 to 5 meters.

Keywords

UHF detectors; dielectric materials; humidity measurement; humidity sensors; ink jet printing; radiofrequency identification; cork dielectric slab substrate; distance 3 m to 5 m; gain 11 dB to 15 dB; humidity passive sensor; inkjet printing technology; passive UHF RFID tag antenna; Antenna measurements; Antennas; Humidity; Radiofrequency identification; Temperature sensors; Wireless sensor networks; RFID; cork substrate; humidity sensor;

fLanguage

English

Publisher

ieee

Conference_Titel

Antennas and Propagation (EuCAP), 2015 9th European Conference on

Conference_Location

Lisbon

Type

conf

Filename

7228346