Signal strength readout and miniaturised antenna for metal-mountable UHF RFID threshold temperature sensor tag
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Yksityiskohdat
| Alkuperäiskieli | Englanti |
|---|---|
| Sivut | 1734-1736 |
| Sivumäärä | 3 |
| Julkaisu | Electronics Letters |
| Vuosikerta | 51 |
| Numero | 22 |
| DOI - pysyväislinkit | |
| Tila | Julkaistu - 22 lokakuuta 2015 |
| OKM-julkaisutyyppi | A1 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.