A High-Resolution Active Microwave Sensor for Contactless Pressure Measurement

Document Type : Original Article

Authors

1 Master's student, Faculty of Electrical Engineering, Hakim Sabzevari University, Sabzevar, Iran

2 Assistant Professor, Faculty of Electrical and Computer Engineering, Hakim Sabzevari University, Sabzevar, Iran

Abstract

In this paper, an active contacless microwave pressure sensor with high-quality factor for harsh environment applications are presented. The proposed sensor operates at 1.2GHz and consists of two parts of a reader antenna and a passive Split Ring Resonator (SRR). A movable pad is located above the resonator by considering an air gap between them and this gap is decreased when external pressure is applied. By decreasing the gap, the resonant frequency of SRR is decreased. The resonant frequency of SRR is measured by using the insertion loss scattering parameter through the reader part, wirelessly. To improve the resolution, the sensor’s quality factor is enhanced by using an active circuit with a positive feedback design in the reader part. Therefore, the quality factor of the passive sensor is increased from 73.91 to 3268 by using the active sensor. The sensitivity of the sensor is 70MHz/mm in both passive and active sensors. The proposed sensor is simulated and studied using CST and ADS software.

Keywords

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References

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Applied Electromagnetics
Volume 11, Issue 1 - Serial Number 26
Serial No. 26, Spring & Summer
June 2023
Pages 31-39

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History

  • Receive Date: 28 August 2021
  • Revise Date: 28 December 2022
  • Accept Date: 16 January 2023
  • Publish Date: 22 May 2023

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