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Microstrip planar resonator sensors for accurate dielectric measurement of microfluidic solutions

This paper presents a microstrip planar resonator sensors for accurate dielectric measurement of microfluidic solutions based on split ring resonator approach. A potential technique for characterization of solvents with the microvolume of samples has been investigated. The proposed design structures are focusing on a high Q-factor (≥400) which operates at 2.0 and 2.2 GHz. The characterization principle technique is based on a resonant perturbation method due to the shifting of resonant frequency response and maximum electric fields distribution. This variation has been estimated analytically to extract the permittivity of aqueous solutions. Besides, a comparison of sensitivity performance between proposed resonator sensors and conventional resonator sensors is presented. The sensor has a simple structure, easy to fabricate, and has a low cost of the manufacturing process which may be applied to beverages industry application for halal authentication purpose. The technique offers opportunities for further research on sample condition factor towards dielectric response.