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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.

在这个项目中有两个主要对象。第一部分是在毫米波和亚毫米波电磁波波段对液晶材料的未知折射率进行估算，这是目前频率资源的前沿。第二部分是研究液晶材料在甚高频振幅和/或相位控制器件中的应用。利用矩形波导制作了一种特殊的液晶盒，并利用网络分析仪研究了其对毫米波的传输特性。在波导液晶盒中施加磁场，可使液晶盒的振幅和相位发生较大的变化，并首次利用亚毫米波激光和干涉测量技术对液晶盒的复折射率进行了测量。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，高透射电极和液晶盒结构是实际器件应用中必不可少的，因为传统的液晶驱动电极在高频波中会产生很大的损耗。提出了光栅电极结构和三明治单元结构，这两种结构对于高透过率、大可变性和高响应速度是非常有效的。利用该结构研究了毫米波波段的相位控制、幅度控制和波束控制功能。在亚毫米波段，由于衬底材料和器件尺寸的限制，要实现同样的控制器件还有一些困难。为了克服这些问题，我们研究了一种新的LC/聚合物复合材料制备方法。