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Sensors 2015, 15(5), 11454-11464; doi:10.3390/s150511454

A Wireless LC Sensor Coated with Ba0.9Bi0.066TiO3 for Measuring Temperature

1
Faculty of Technical Sciences, University of Novi Sad, Trg Dositeja Obradovica 6, Novi Sad 21000, Serbia
2
Saint-Gobain R&D Center, 9 Goddard road, Northborough, MA 01532, USA
3
Faculty of Technology, University of Novi Sad, Bulevar Cara Lazara 1, Novi Sad 21000, Serbia
4
Instytut Technologii Elektronowej, Ul. Zablocie 39, Krakow 30-701, Poland
*
Author to whom correspondence should be addressed.
Academic Editor: Feng Xia
Received: 16 January 2015 / Revised: 11 May 2015 / Accepted: 11 May 2015 / Published: 18 May 2015
(This article belongs to the Section Physical Sensors)
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Abstract

This paper presents a passive LC wireless sensor for measuring temperature. The sensor is designed as a parallel connection of a spiral inductor and an interdigitated capacitor and it was fabricated in a conductive layer using LTCC (Low Temperature Co-fired Ceramic) technology. The inderdigitated capacitor electrodes were coated with a thin film of bismuth doped barium titanate (Ba0.9Bi0.066TiO3), whose permittivity changes with temperature, which directly induces changes in the capacitance of the interdigitated capacitor and consequently changes the resonant frequency of the sensor. The measurements of S-parameter of the sensor were performed using a Vector Network Analyzer (E5071B, Agilent Technologies, Santa Clara, CA, USA), whose port was connected to the antenna coil that was placed around the sensor in order to be able to wirelessly detect temperature, in the temperature range from 25 °C to 165 °C. View Full-Text
Keywords: LC sensor; wireless; BBT ceramic; measuring temperature LC sensor; wireless; BBT ceramic; measuring temperature
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Radovanovic, M.; Mojic-Lante, B.; Cvejin, K.N.; Srdic, V.V.; Stojanovic, G.M. A Wireless LC Sensor Coated with Ba0.9Bi0.066TiO3 for Measuring Temperature. Sensors 2015, 15, 11454-11464.

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