TY  - JOUR
AU  - Barannik
AU  - Vitusevich, Svetlana
AU  - Gubin
AU  - Protsenko
AU  - Cherpak
TI  - THE MEASURING CELL BASED ON THE QUARTZ QUAZIOPTICAL RESONATOR FOR RESEARCH ON DIELECTRIC LIQUIDS IN THE SUB-THZ RANGE
JO  - Telecommunications and radio engineering
VL  - 75
SN  - 0040-2508
CY  - New York, NY
PB  - Scripta Technica, Inc.
M1  - FZJ-2017-01873
SP  - 1583-1590
PY  - 2016
AB  - Using WGM resonators allows achieving a high accuracy in determining the dielectric permittivity of substances due to their high Q-factor. The resonator with a microfluidic channel is promising for the study of small-volume liquids that is especially important in the case of biologic liquids. In a Ka-band a sapphire resonator with microfluidic channel has been proposed as a measuring cell, but in the sub-THz range a quartz resonator has more suitable characteristics due to its high Q-factor. In the paper we offer a measuring cell for determining the complex permittivity of liquids in the sub-THz range. The cell is designed on the basis of a quasi-optical quartz resonator with a layer of plastic containing a microfluidic channel. Experimental studies of the resonator structure are carried out and a model for numerical research in the software COMSOL Multiphysics program is proposed. By comparison of the resonator frequencies and Q-factor values with the corresponding values, obtained using the numerical model, the correction of the model has been carried out for the water-filled microfluidic channel. It is shown that the model for numerical studies correctly describes the resonator structure. The experimental and calculated values of the resonator frequency and of the Q-factor, obtained for the microfluidic channel filled with substances the complex permittivity of which is well known (methanol, propanol, ethanol, acetone), are in good agreement. The resonator proposed may be used as a measuring cell for determining a small-volume liquid permittivity by a special calibration procedure.
LB  - PUB:(DE-HGF)16
DO  - DOI:10.1615/TelecomRadEng.v75.i17.60
UR  - https://juser.fz-juelich.de/record/827767
ER  -