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

Sensors

Milan Radovanovic²  Bojana Mojic-Lante³  Katarina N. Cvejin¹  Vladimir V. Srdic⁴  Goran M. Stojanovic² 

[1] Faculty of Technology, University of Novi Sad, Bulevar Cara Lazara 1, Novi Sad 21000, Serbia; E-Mail:;Faculty of Technical Sciences, University of Novi Sad, Trg Dositeja Obradovica 6, Novi Sad 21000, Serbia; E-Mail:;Saint-Gobain R&D Center, 9 Goddard road, Northborough, MA 01532, USA; E-Mail:;Instytut Technologii Elektronowej, Ul. Zablocie 39, Krakow 30-701, Poland; E-Mail:

关键词: LC sensor;    wireless;    BBT ceramic;    measuring temperature;   

DOI  :  10.3390/s150511454

来源: mdpi

【 摘 要 】

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 (Ba_0.9Bi_0.066TiO₃), 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.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.