研究目的
To characterize liquid crystals (LC) at 60 GHz using a temperature-controlled automated measurement setup for precise determination of dielectric properties.
研究成果
The LC was successfully characterized at 60 GHz, showing a decrease in permittivity and loss tangent for parallel orientation and a slight increase in permittivity with a significant decrease in loss tangent for orthogonal orientation compared to 19 GHz. The anisotropy of the LC also decreased at the higher frequency.
研究不足
The method is limited to single frequency points due to the resonant nature of the characterization. The small size of the resonator at 60 GHz and the necessity of a solid container for the LC introduce challenges in sample size and deembedding.
1：Experimental Design and Method Selection:
A resonant method using a λ/2 waveguide cavity resonator was designed for high accuracy in permittivity and loss tangent measurements.
2：Sample Selection and Data Sources:
The LC mixture GT3-23001 from Merck KGaA was used, inserted into a thin silica quartz tube.
3：List of Experimental Equipment and Materials:
A resonator milled in split-block technology out of brass and gold plated, permanent rare earth magnets for LC orientation, a Julabo FP50 refrigerated/heating circulator, a Pt100 sensor for temperature measurement, and a PNA-X from Keysight Technologies for measurements.
4：Experimental Procedures and Operational Workflow:
The resonator's response was measured empty, with an empty quartz tube, and with LC in both parallel and orthogonal orientations.
5：Data Analysis Methods:
Full-wave simulations were used to extract permittivities and loss tangents by matching simulation results to measured resonance frequencies and Q-factors.
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