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Sensors 2017, 17(9), 1963; doi:10.3390/s17091963

Slot Antenna Integrated Re-Entrant Resonator Based Wireless Pressure Sensor for High-Temperature Applications

1,2,†
,
1,2,†
,
1,2
,
3
,
1,2,* , 1,2
and
1,2
1
Key Laboratory of Instrumentation Science & Dynamic Measurement, Ministry of Education, North University of China, Taiyuan 030051, China
2
Science and Technology on Electronic Test and Measurement Laboratory, North University of China, Taiyuan 030051, China
3
Department of Mechanical & Electrical Engineering, Xiamen University, Xiamen 361005, China
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Received: 13 July 2017 / Revised: 22 August 2017 / Accepted: 23 August 2017 / Published: 25 August 2017
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [17629 KB, uploaded 25 August 2017]   |  

Abstract

The highly sensitive pressure sensor presented in this paper aims at wireless passive sensing in a high temperature environment by using microwave backscattering technology. The structure of the re-entrant resonator was analyzed and optimized using theoretical calculation, software simulation, and its equivalent lump circuit model was first modified by us. Micro-machining and high-temperature co-fired ceramic (HTCC) process technologies were applied to fabricate the sensor, solving the common problem of cavity sealing during the air pressure loading test. In addition, to prevent the response signal from being immersed in the strong background clutter of the hermetic metal chamber, which makes its detection difficult, we proposed two key techniques to improve the signal to noise ratio: the suppression of strong background clutter and the detection of the weak backscattered signal of the sensor. The pressure sensor demonstrated in this paper works well for gas pressure loading between 40 and 120 kPa in a temperature range of 24 °C to 800 °C. The experimental results show that the sensor resonant frequency lies at 2.1065 GHz, with a maximum pressure sensitivity of 73.125 kHz/kPa. View Full-Text
Keywords: re-entrant resonator; slot antenna; wireless pressure sensor; high temperature; background clutter compensation re-entrant resonator; slot antenna; wireless pressure sensor; high temperature; background clutter compensation
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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

Su, S.; Lu, F.; Wu, G.; Wu, D.; Tan, Q.; Dong, H.; Xiong, J. Slot Antenna Integrated Re-Entrant Resonator Based Wireless Pressure Sensor for High-Temperature Applications. Sensors 2017, 17, 1963.

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