Study on Liquid Crystal Millimeter-wave Control Device Obtained with the Integration on Planar Type Waveguide

研制了一种基于微带线的平面型毫米波液晶移相器。对新型LC移相器的关键部分--转换电路进行了结构优化，提高了移相器的工作频率。移相器的传输损耗特别是在高频区得到了显著改善，工作频率达到了50 GHz以上的毫米波区。详细研究了曲折电极结构下的液晶分子取向状态，这对器件的小型化是有益的。利用负介电各向异性液晶材料研究了互补操作所必需的基本分子取向现象。在此基础上，研究了LC移相器与天线阵列系统的集成问题。

Planar type millimeter-wave liquid crystal (LC) phase shifter is developed based on the micro-strip-line. Structure of the conversion circuit, which is the key part of the novel LC phase shifter, is optimized to improve the operational frequency. Transmission loss of the phase shifter especially in the high frequency region is significantly improved and operational frequency comes up to the millimeter wave region over 50GHz.LC Molecular orientation state under the meander electrode structure, which is useful for downsizing the device, is investigated in detail. Basic molecular orientation phenomena are also investigated by using negative dielectric anisotropic LC material, which is necessary for complementary operation. Based on these results, integration of antenna array system with the LC phase shifter is investigated.