volume | PIER Journals

Abstract

In this study, a double reentrant cavity sensor (DRECS) loaded with ring gaps is proposed to characterize the displacement that the metal plate is inserted into the DRECS. The conventional substrate-parasitic-capacitance of DRECS in the substrate integrated waveguide (SIW) configuration, which has no contribution to the sensitivity, is successfully eliminated by using a symmetric double reentrant cavity. The ring gaps are introduced in SIW DRECS to effectively suppress the fringe electric field around the post, and enlarge the range of displacement measurements. Additionally, a displacement model, which is characterized by the quantitative relationship between the resonant frequency of DRECS and insertion depth inside DRECS, is theoretically established with the help of the electric field distribution and the equivalent circuit of the DRECS. A prototype of the designed sensor is fabricated and measured. The sensor work at 1.5-3.1 GHz and the measured results are in good agreement with the simulated ones from the displacement model. The measurement results indicate that the sensor has a displacement test range of 27 mm and Q-factor of over 150, and can achieve high sensitivity of 58 MHz/mm.

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Dr. Jixu Ma

Dr. Yukang Chen

Prof. Jie Huang