Analysis of Dynamic Response of Permittivity in a Liquid Crystal Cell with Flow

India-Japan Expert Group Meeting on Biomolecular Electronics & Organic Nanotechnology for Environment Preservation

物理学;生物科学;生态环境科学

Ozaki, R.^1 ; Matsuura, K.^1 ; Kadowaki, K.^1 ; Duong, T.Q.^2 ; Moritake, H.^2

Department of Electrical and Electronic Engineering and Computer Science, Graduate School of Science and Engineering, Ehime University, 3 Bunkyo-Cho, Matsuyama, Ehime

790-8577, Japan^1

Department of Electrical and Electronic Engineering, National Defense Academy, 1-10-20 Hashirimizu, Yokosuka, Kanagawa

239-8686, Japan^2

关键词: Backflow effect;    Continuum theory;    Liquid crystal cells;    Microwave phase shifters;    Response curves;    Time constants;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/704/1/012021/pdf
DOI  :  10.1088/1742-6596/704/1/012021

来源: IOP

【 摘 要 】

Microwave and millimeter-wave devices including a liquid crystal (LC) are increasingly attractive for the use in adaptive and controllable devices. Various types of microwave phase shifters having an LC transmission line have been studied (e.g. microstripline, coplanar waveguide, and rectangular waveguide). In conventional microwave devices, the response time after removal of voltage is slow because the LC layer in the devices is usually thick. In this study, the time response of the LC permittivity is studied experimentally and theoretically. Experimentally measured response curves having two time constants for decay are examined by using Frank's continuum theory with and without the backflow effect.