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.

该项目中有两个主要对象。首先是评估毫米和亚毫米电磁波区域中液晶（LC）材料的未知折射率，这仍然是频率资源的前沿。下一个是研究液晶材料在非常高频率区域中振幅和/或相控制装置的可能性。使用矩形波导指南制造了一个非凡的LC电池，并使用网络分析仪研究了毫米波的传输特性。通过将磁场施加到Wave引导LC Cell.com.plex折射指数，可以通过首次使用亚毫米式摇动激光器和干涉仪技术来估算幅度和相位的巨大变化。新的光学测试调查导致液晶材料在光学测量系统中的新应用。高传输电极和细胞结构对于实际设备应用是必不可少的，因为常规的LC驱动电极在高频波中会造成很大的损失。提出了光栅电极结构和三明治细胞结构，它们对于具有较大可变性和高响应速度的高传输非常有效。使用设备结构研究了相控制，振幅控制和梁转向功能。在亚亚毫米级区域中，由于基板材料和设备尺寸，要获得相同的控制设备还有一些进一步的困难。已经研究了一种使用LC/聚合物复合材料来克服问题的新型LC设备制造方法。