An Ultrahigh Sensitivity Dual Band Microwave Sensor based on EBG For Dielectric Characterization of Liquids

In this paper, EBG based dual band microwave sensor is proposed for dielectric characterization of liquids with ultrahigh sensitivity. The proposed sensor consists of two EBG patches with different sizes, two edges located via an electrically coupled with suspended micro strip line. Two channels are used in the electric field region of each EBG patch with changes in the dielectric constant of the substrate therefore, a change in the frequency shift and transmission response are observed, which will help to describe the dielectric characterization of liquid under test (LUT). A matrix-based mathematical model is developed for the calibration and validation of the sensor. The results are experimentally verified for the binary mixture of water and ethanol. The proposed sensor is operated at 1.05 and 2.47 GHz and achieved an average sensitivity of 0. 931%, 0. 243% and a quality factor of 168.64, 228.64 with compact size 0.164λ ₀ × 0.164λ ₀