A Portable Microwave Interferometry Sensor for Permittivity Detection Based on CCMRC

• Main Authors: Shichang Chen, Feng Zhou, Kuiwen Xu, Peng Zhao, Yang Yang, Xi Zhu, Gaofeng Wang
• Format: Article
• Language: English
• Published: IEEE 2020-01-01
• Series: IEEE Access
• Subjects: Complementary compact microstrip resonant cell (CCMRC); dielectric spectroscopy; direct-conversion mixer; interferometry; microwave sensor
• Online Access: https://ieeexplore.ieee.org/document/9134713/

A portable microwave complex permittivity sensor based on the interferometry configuration is proposed. A complementary compact microstrip resonant cell (CCMRC) is applied as the sensitive element, which converts the dielectric information of the material under test (MUT) into the phase variations of its transmission coefficient. A miniaturized interferometry platform based on a down-converting mixer further translates the phase change into DC output voltage variation, which can be readily recorded with a direct readout circuit. In this context, expensive and bulky vector network analyzer is no longer needed, thereby leading to a low hardware cost. With comprehensive theoretical analysis, the material permittivity is simply extracted using a specific extrapolation algorithm. As a proof of concept, several different solid material samples with known permittivity values are used to verify the devised detection system.