Improvement of decay time in nematic-liquid-crystal-loaded coplanar-waveguide-type microwave phase shifter by polymer stabilizing method

2013 ◽  
Vol 53 (1S) ◽  
pp. 01AE08 ◽  
Author(s):  
Thanh Nguyen ◽  
Shuhei Umeno ◽  
Hiroki Higuchi ◽  
Hirotsugu Kikuchi ◽  
Hiroshi Moritake
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Decay Time ◽  
Phase Shifter ◽  
Coplanar Waveguide ◽  
Microwave Phase Shifter ◽  
Waveguide Type

scholarly journals Response Improvement of Liquid Crystal-Loaded NRD Waveguide Type Terahertz Variable Phase Shifter

Crystals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 307 ◽  
Author(s):  
Trong Nghia Lang ◽  
Van Bao Bui ◽  
Yo Inoue ◽  
Hiroshi Moritake
Keyword(s):  
Liquid Crystal ◽  
Response Time ◽  
Phase Change ◽  
Decay Time ◽  
Phase Shifter ◽  
Dielectric Anisotropy ◽  
Driving Voltage ◽  
Crystal Layer ◽  
Liquid Crystal Layer ◽  
Waveguide Type

Liquid crystals, which have high dielectric anisotropy even in the terahertz region and are easily controllable for dielectric permittivity by applying an electric field, have become increasingly attractive in recent years. The non-radiative dielectric (NRD) waveguide has a structure in which a dielectric line is sandwiched between two metal plates and by replacing the dielectric part with liquid crystal, a low loss liquid crystal-loaded NRD waveguide type terahertz phase shifter can be obtained. However, since the thickness of the liquid crystal layer is several hundred micrometers, it has a response time of as long as several hundred seconds when the driving voltage is removed. It is necessary to devise improvements for practical application. By inserting two polyethylene terephthalate (PET) films and reducing the thickness of the liquid crystal layer, the decay time was improved well, but the phase change was significantly reduced. In this study, we report improving both decay time and phase change with aligned nanofiber/liquid crystal complex. In addition, we demonstrate liquid crystal-load phase shifter, which has 360° phase change and the response time below one second.

Fast-Switching Microwave Phase Shifter of Coplanar Waveguide Using Ferroelectric Liquid Crystal

2007 ◽  
Vol 46 (No. 21) ◽  
pp. L519-L521 ◽  
Author(s):  
Hiroshi Moritake ◽  
Satoshi Morita ◽  
Ryotaro Ozaki ◽  
Toshihisa Kamei ◽  
Yozo Utsumi
Keyword(s):  
Liquid Crystal ◽  
Phase Shifter ◽  
Coplanar Waveguide ◽  
Ferroelectric Liquid Crystal ◽  
Fast Switching ◽  
Microwave Phase Shifter
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