TUTCRIS - Tampereen teknillinen yliopisto

TUTCRIS

Signal strength readout and miniaturised antenna for metal-mountable UHF RFID threshold temperature sensor tag

Tutkimustuotosvertaisarvioitu

Yksityiskohdat

AlkuperäiskieliEnglanti
Sivut1734-1736
Sivumäärä3
JulkaisuElectronics Letters
Vuosikerta51
Numero22
DOI - pysyväislinkit
TilaJulkaistu - 22 lokakuuta 2015
OKM-julkaisutyyppiA1 Alkuperäisartikkeli

Tiivistelmä

A new method for the wireless monitoring of a battery-free threshold temperature sensor based on a passive ultra-high-frequency radiofrequency identification (RFID) tag integrated with a bimetal thermostat switch is presented. The strategic placement of the switch brings about a strong modification in the tag antenna impedance as the temperature crosses over a threshold value. Optimisation of the narrow-band tag antenna to operate at the edges of the 902-928 MHz frequencyhopping spread spectrum RFID in the different switch states provides separate sub-bands for the readout above and below a threshold temperature. The results show that this enables an unambiguous sensor readout by monitoring the backscattered signal strength.