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- Title
Dielectrically-Loaded Cylindrical Resonator-Based Wireless Passive High-Temperature Sensor.
- Authors
Jijun Xiong; Guozhu Wu; Qiulin Tan; Tanyong Wei; Dezhi Wu; Sanmin Shen; Helei Dong; Wendong Zhang
- Abstract
The temperature sensor presented in this paper is based on a microwave dielectric resonator, which uses alumina ceramic as a substrate to survive in harsh environments. The resonant frequency of the resonator is determined by the relative permittivity of the alumina ceramic, which monotonically changes with temperature. A rectangular aperture etched on the surface of the resonator works as both an incentive and a coupling device. A broadband slot antenna fed by a coplanar waveguide is utilized as an interrogation antenna to wirelessly detect the sensor signal using a radio-frequency backscattering technique. Theoretical analysis, software simulation, and experiments verified the feasibility of this temperature-sensing system. The sensor was tested in a metal-enclosed environment, which severely interferes with the extraction of the sensor signal. Therefore, frequency-domain compensation was introduced to filter the background noise and improve the signal-to-noise ratio of the sensor signal. The extracted peak frequency was found to monotonically shift from 2.441 to 2.291 GHz when the temperature was varied from 27 to 800 °C, leading to an average absolute sensitivity of 0.19 MHz/°C.
- Subjects
DIELECTRIC-loaded waveguides; DIELECTRIC resonators; WIRELESS sensor networks; PASSIVE components; OPTICAL apertures; BACKSCATTERING
- Publication
Sensors (14248220), 2016, Vol 16, Issue 12, p2037
- ISSN
1424-8220
- Publication type
Article
- DOI
10.3390/s16122037