Title :
A wireless chipless temperature sensor utilizing an orthogonal polarized backscatter scheme
Author :
Kubina, Bernd ; Mandel, Christian ; Schussler, Martin ; Sazegar, M. ; Jakoby, Rolf
Author_Institution :
Inst. for Microwave Eng. & Photonics, Tech. Univ. Darmstadt, Darmstadt, Germany
fDate :
Oct. 29 2012-Nov. 1 2012
Abstract :
A novel passive wireless temperature sensor is presented which is designed planar and chipless. The sensor tag uses a backscatter scheme with two linear polarization planes to seperate transmit and receive path during wireless readout. The measured value is encoded in the spectral signature of the tag by a temperature-dependent notch filter. This filter is set up as a coupled line resonator, loaded by an interdigital Barium-Strontium-Titanate (BST) varactor. The temperature-dependency of the permittivity of the ferroelectric BST affects the varactor´s capacity and consequently allows a temperature measurement. The sensor has been successfully operated in the temperature range between 20 °C and 85 °C.
Keywords :
notch filters; permittivity measurement; polarisation; temperature measurement; temperature sensors; varactors; BST varactor; coupled line resonator; ferroelectric BST; interdigital barium-strontium-titanate varactor; linear polarization planes; orthogonal polarized backscatter scheme; permittivity; spectral signature; temperature 20 degC to 85 degC; temperature measurement; temperature-dependency; temperature-dependent notch filter; wireless chipless temperature sensor; wireless readout; Antenna measurements; Backscatter; Temperature measurement; Temperature sensors; Varactors; Wireless communication; Wireless sensor networks; Passive microwave remote sensing; ferroelectric materials; sensor systems and applications; temperature sensors;
Conference_Titel :
Microwave Conference (EuMC), 2012 42nd European
Conference_Location :
Amsterdam
Print_ISBN :
978-1-4673-2215-7
Electronic_ISBN :
978-2-87487-026-2
