| Autor: |
Fujikake, Hideo, Kuki, Takao, Nomoto, Toshihiro, Tsuchiya, Yuzuru, Utsumi, Yozo |
| Předmět: |
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| Zdroj: |
Journal of Applied Physics; 5/15/2001, Vol. 89 Issue 10, p5295, 4p, 1 Black and White Photograph, 3 Diagrams, 3 Graphs |
| Abstrakt: |
This article describes the use of thick polymer-stabilized liquid crystal films in a new design for microwave variable phase shifters. A fine μm-order sized polymer network was formed in a 100-μm-thick liquid crystal film, using a photopolymerization-induced phase-separation method to stabilize the molecular alignment of the liquid crystal. Measurement of the electro-optic properties of the liquid crystal film revealed that the relaxation response time of the liquid crystal alignment was drastically decreased by doping the polymer at a concentration of several wt %. A new variable phase shifter composed of a microstrip transmission line (length: 193 mm, width: 200 μm) was also fabricated by using the liquid crystal film as the dielectric material. This device exhibited a microwave phase shift of -80° at a frequency of 20 GHz, when a drive voltage of 70 V[sub rms] was applied vertically to the liquid crystal film. © 2001 American Institute of Physics. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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