摘要
利用矩形波导管和向量分析仪,测量了几种液晶材料在26.5~40GHz波段(Ka波)的介电常数。实验表明,1kHz频率下呈现正、负介电各向异性的液晶材料,在该微波波段下都显示为正的介电各向异性。尽管这些材料的静介电常数各向异性相差很大,但是该微波波段对应的介电各向异性相差却很小,而且在26.5~38GHz区间内几乎不随频率的增大而发生变化。
A reflection-type liquid crystal (LC) test cell prepared with a K-band rectangular waveguide is used to determine the dielectric constant of LC materials. It is found that the usual LCs showing positive or negative dielectric anisotropy in 1 kHz reveal positive dielectric anisotropy in millimeter wave region. Furthermore, the high frequent dielectric anisotropy shows slight difference among the LCs and weakly frequency dependency between 26.5-37 GHz.
出处
《液晶与显示》
CAS
CSCD
北大核心
2009年第6期779-782,共4页
Chinese Journal of Liquid Crystals and Displays
基金
国家自然科学基金(No.60577050)
关键词
矩形波导管
液晶
介电常数
rectangular waveguide
liquid crystal
dielectric constant