WGM resonators with microfluidic channel for sub-mm wave characterization of biological liquids

We present the measurement technique for studying the electromagnetic properties of small-volume water solutions of bioliquids in sub-THz band. The measurement cell is based on the quartz resonator covered by the plastic layer with the microfluidic channel filled with the liquid under test. The experimental and numerical studies of the resonator with the microfluidic channel filled with liquids with known properties were carried out to show the suitability of the resonator structure for the permittivity measurements. The resonator structure with the microfluidic channel filled with glucose and albumine water solutions was studied experimentally. The solution permittivity values can be obtained by solving of the inverse electromagnetic problem.