title: Dielectrically-Loaded Cylindrical Resonator-Based Wireless Passive High-Temperature Sensor.
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.
authors.affiliation: Key Laboratory of Instrumentation Science & Dynamic Measurement, Ministry of Education, North University of China, Taiyuan 030051, China. xiongjijun@nuc.edu.cn.|Science and Technology on Electronic Test and Measurement Laboratory, North University of China, Taiyuan 030051, China. xiongjijun@nuc.edu.cn.
authors.forename: Jijun
authors.initials: J
authors.lastname: Xiong
authors.affiliation: Key Laboratory of Instrumentation Science & Dynamic Measurement, Ministry of Education, North University of China, Taiyuan 030051, China. pillar921@163.com.|Science and Technology on Electronic Test and Measurement Laboratory, North University of China, Taiyuan 030051, China. pillar921@163.com.
authors.forename: Guozhu
authors.initials: G
authors.lastname: Wu
authors.affiliation: Key Laboratory of Instrumentation Science & Dynamic Measurement, Ministry of Education, North University of China, Taiyuan 030051, China. tanqiulin@nuc.edu.cn.|Science and Technology on Electronic Test and Measurement Laboratory, North University of China, Taiyuan 030051, China. tanqiulin@nuc.edu.cn.
authors.forename: Qiulin
authors.initials: Q
authors.lastname: Tan
authors.affiliation: Key Laboratory of Instrumentation Science & Dynamic Measurement, Ministry of Education, North University of China, Taiyuan 030051, China. weity1989@163.com.|Science and Technology on Electronic Test and Measurement Laboratory, North University of China, Taiyuan 030051, China. weity1989@163.com.
authors.forename: Tanyong
authors.initials: T
authors.lastname: Wei
authors.affiliation: Department of Mechanical & Electrical Engineering, Xiamen University, Xiamen 361005, China. wdz@xmu.edu.cn.
authors.forename: Dezhi
authors.initials: D
authors.lastname: Wu
authors.affiliation: Key Laboratory of Instrumentation Science & Dynamic Measurement, Ministry of Education, North University of China, Taiyuan 030051, China. shensanming@nuc.edu.cn.|Science and Technology on Electronic Test and Measurement Laboratory, North University of China, Taiyuan 030051, China. shensanming@nuc.edu.cn.
authors.forename: Sanmin
authors.initials: S
authors.lastname: Shen
authors.affiliation: Key Laboratory of Instrumentation Science & Dynamic Measurement, Ministry of Education, North University of China, Taiyuan 030051, China. donghelei@nuc.edu.cn.|Science and Technology on Electronic Test and Measurement Laboratory, North University of China, Taiyuan 030051, China. donghelei@nuc.edu.cn.
authors.forename: Helei
authors.initials: H
authors.lastname: Dong
authors.affiliation: Key Laboratory of Instrumentation Science & Dynamic Measurement, Ministry of Education, North University of China, Taiyuan 030051, China. wdzhang@sxedu.gov.cn.|Science and Technology on Electronic Test and Measurement Laboratory, North University of China, Taiyuan 030051, China. wdzhang@sxedu.gov.cn.
authors.forename: Wendong
authors.initials: W
authors.lastname: Zhang
keywords: dielectric resonator; high-temperature environment; relative permittivity; temperature sensing