Abstract
Abstract This article presents a pentagonal complementary split ring resonator (PCSRR) sensor for characterizing materials based on their dielectric properties. The operational frequency of the sensor is chosen to be in the licensed free ISM band of 2.45 GHz for potential future deployment with radio frequency modules. Eleven liquid samples with real and imaginary parts of permittivity ranging from 1-45 and 0-6.7, respectively, have been used as sample specimens to characterize the sensor’s performance. With the highly concentrated electric field, the sensor achieves a high normalized sensitivity of 2.13% and an average sensitivity of 51.89 MHz per unit dielectric constant. Regression models have been further developed for complex permittivity evaluation from the scattering spectrum of the sensor loaded with the liquid samples. Additionally, the variations in the sensor's capacitance due to different loaded samples have been analyzed, and regression techniques have been employed to develop relationships between permittivity and capacitance.
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