Evaluation and application of liquid crystal materials in the millimeter and submillimeter wave region

毫米波及亚毫米波区域液晶材料评价及应用

基本信息

批准号：
09650006
负责人：
NOSE Toshiaki
金额：
$ 2.24万
依托单位：
Akita Prefectural University (1999)Akita University (1997-1998)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09650006/
关键词：
Liquid crystal Millimeter wave Submillimeter wave Phase modulation Beam steering LC polymer composite materials

项目摘要

There are two main objects in this project. First one is evaluation of the unknown refractive index of the liquid crystal (LC) materials in millimeter and submillimeter electromagnetic wave region which is still frontier of the frequency resources. Next one is investigation of a possibility application of the liquid crystal materials to amplitude and/or phase controlling device in the very high frequency regions. An extraordinary LC cell using the rectangular wave guide was fabricated and the transmission properties of the millimeter wave were investigated using network analyzer. Large change of the amplitude and phase can be obtained by applying magnetic field to the wave guide LC cell.Complex refractive index was estimated by using submillimeter waver laser and interferometry technique for the first time. The new optical-test investigation led to cause a new application of liquid crystal materials to the optical measuring system.High transmission electrode and cell structures are indispensable for actual device application, because the conventional LC driving electrode causes a very large loss in the high frequency waves. Grating electrode structure and sandwich cell structure were proposed and they were very effective for high transmission with large variability and high response speed. Phase control, amplitude control and beam steering functions were investigated in the millimeter wave region by using the device structure. In the submillimeter region, there are some further difficulties to achieve the same controlling devices because of the substrate materials and the device size. A new LC device fabrication method by using LC/polymer composite have been investigated to overcome the problems.

该项目有两个主要对象。第一个是在毫米和亚毫米电磁波区域评估液晶（LC）材料的未知折射率，这仍然是频率资源的前沿。下一步是研究液晶材料在甚高频区域的振幅和/或相位控制装置中的可能性应用。制造了一种使用矩形波导的非凡液晶盒，并使用网络分析仪研究了毫米波的传输特性。通过对波导液晶池施加磁场，可以获得振幅和相位的大变化。首次利用亚毫米波激光和干涉测量技术估计了复折射率。新的光学测试研究导致了液晶材料在光学测量系统中的新应用。高透射电极和单元结构对于实际器件应用是必不可少的，因为传统的液晶驱动电极在高频中会造成非常大的损耗波浪。提出了光栅电极结构和夹层单元结构，它们对于高传输、大可变性和高响应速度非常有效。利用该器件结构研究了毫米波区域的相位控制、幅度控制和波束控制功能。在亚毫米区域，由于基板材料和器件尺寸的原因，实现相同的控制器件还存在一些进一步的困难。研究了一种使用液晶/聚合物复合材料制造液晶器件的新方法来克服这些问题。