High Sensitive Microwave Microfluidic Sensor Based on Split Ring Resonator for Determination Liquid Permittivity Characterization

Abstract

a microwave microfluidic microstrip spilt ring resonator is presented in this paper for liquid sensing and characterization. The sensor is designed to operate at frequency of 1.4 GHz and quality factor of 360. The sensor has been tested with several solvents to verify its sensitivity where the resonant frequency and losses vary with each solvent. The shift in the resonant frequency and the change in the insertion loss have been used to extract the values of the complex permittivity of the solvent. The measured complex permittivities of the solvents have been compared with the theoretical values with very good agreement. This sensor can be utilized in many industrial and medical application where the characterization of liquids are needed.