Passive Wireless Temperature Sensor Based on Time-Coded UWB Chipless RFID Tags

Author

Girbau, David ; Ramos, Ángel ; Lázaro, Antonio ; Rima, Sergi ; Villarino, Ramón

Author_Institution

Dept. of Electron., Electr. & Autom. Control Eng., Univ. Rovira i Virgili, Tarragona, Spain

Volume

60

Issue

11

fYear

2012

Firstpage

3623

Lastpage

3632

Abstract

In this paper, an RF identification sensor system is developed. It comprises passive sensors and an ultra-wideband (UWB) reader. The sensors are based on time-coded chipless tags. They consist of an UWB antenna connected to a delay line that is, in turn, loaded with a resistive temperature sensor. This sensor modulates the amplitude of the backscattered signals as a function of the temperature. The sensor tags are identified by changing the length of the delay line. In this paper, the operation principle and design of time-coded tags is presented and the integration of sensors in these tags is addressed. In addition, two measurement techniques are compared to implement the UWB reader. The first one is based on frequency sweeping and uses a vector network analyzer. The second one is based on a low-cost UWB radar. A full characterization of the sensor system is provided.

Keywords

network analysers; radiofrequency identification; radiofrequency measurement; temperature sensors; ultra wideband radar; wireless sensor networks; RF identification sensor system; UWB antenna; UWB reader; backscattered signals; delay line; frequency sweeping; low-cost UWB radar; measurement techniques; passive wireless temperature sensor; resistive temperature sensor; sensor tags; time-coded UWB chipless RFID tags; time-coded chipless tags; ultrawideband reader; vector network analyzer; Delay lines; Radiofrequency identification; Resistance; Temperature measurement; Temperature sensors; Transmission line measurements; Wireless sensor networks; Chipless tag; RF identification (RFID); ultra-wideband (UWB); wireless sensor network;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/TMTT.2012.2213838

Filename

6296730