The microwave phase modulation of liquid crystal depends on the rotation angle of liquid crystal molecules under the external electric field, and the alignment layer on the surface of liquid crystal drive electrode important influence on it. In this paper, the microwave phase modulation characteristics of non-chiral doped nematic liquid crystal under different materials with polar alignment layer and different rubbing alignment conditions are studied. The variation of different frictional strengths and microwave phase-shifts magnitude with the driving voltage of liquid crystal was tested through the test method. It provides a basis for the design of a liquid crystal microwave modulator and the selection of liquid crystal alignment materials.
The liquid crystal phase shifter integrates the technologies of the liquid crystal display and radar antenna. It belongs to a brand-new interdisciplinary research field. The traditional leakage rate test method of electronic components is not suitable for the liquid crystal phase shifter. The liquid crystal phase shifter and liquid crystal display have similar structures and they are sealed by sealant, so, this article adopts the saturated vapor experiment and liquid crystal display material physical properties test method to make a theoretical research and experimental verification for the leak rate of the liquid crystal phase shifter. In this paper, we set up a kind of theoretical model for the liquid crystal phase shifter leak rate test and realize the actual measurement for the theoretical model. The test results comply with expected judgment, which shows that the theoretical model works, and the test results have actual guiding significance for the material and technological selection for producing liquid crystal phase shifters.
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