A multi-band high-sensitivity microwave sensor for simultaneous detection of two dielectric materials

Chen Wang; Xiaoming Liu; Dan Zhang; Xiaofan Yang

doi:10.1063/5.0235295

A multi-band high-sensitivity microwave sensor for simultaneous detection of two dielectric materials

Rev Sci Instrum. 2025 Jan 1;96(1):015004. doi: 10.1063/5.0235295.

Authors

Chen Wang¹, Xiaoming Liu², Dan Zhang², Xiaofan Yang³

Affiliations

¹ School of Computer and Information, Anhui Normal University, Wuhu 241002, China.
² School of Physics and Electronic Information, Anhui Normal University, Wuhu 241002, China.
³ The State Key Laboratory of Complex Electromagnetic Environment Effects on Electronic and Information System, Luoyang 471004, China.

PMID: 39835945
DOI: 10.1063/5.0235295

Abstract

A multi-band high-sensitivity microwave sensor is reported. The two resonance units are based on complementary square spiral resonators (CSSRs) and produce four measurement bands through parasitic resonances. The four frequency bands are 2.001, 2.988, 5.438, and 7.755 GHz, respectively. Through an analysis of the coupling effects between the two CSSR resonance units, it is shown that the sensor is capable of simultaneously characterizing two samples with distinct dielectric properties. By adding a metal patch to the microstrip line, the overall quality factor of the sensor is enhanced, leading to higher sensitivity and accuracy in both real and imaginary part measurements. The measurement results demonstrate that this sensor provides an accurate and efficient solution for solid permittivity measurements.