Systematic investigation of molecular structure of nematic-phase liquid crystals for reduction of dielectric loss in microwave control applications

Yoichi Murakami, Yosei Shibata, Hiroyasu Sato, Takahiro Ishinabe, Qiang Chen, Hideo Fujikake

Research output: Contribution to journalArticlepeer-review

Abstract

For realization of phase shifting using a liquid crystal (LC) that can continuously control the phase of microwaves, we evaluated the relationship between the molecular structure of the LC, which assumes a nematic phase at room temperature, and the dielectric loss in microwave frequency. The results indicated that the LC has a rigid molecular structure, has fluorine as a polar group, and is in a low temperature, leading to lower dielectric loss. From these results, we considered that dielectric loss can be reduced by suppression of the thermal vibration of LC molecules under microwave exposure.

Original languageEnglish
Pages (from-to)218-223
Number of pages6
JournalITE Transactions on Media Technology and Applications
Volume8
Issue number4
DOIs
Publication statusPublished - 2020

Keywords

  • Dielectric loss
  • Nematic liquid crystal
  • Phase shifter
  • Radio frequency

ASJC Scopus subject areas

  • Signal Processing
  • Media Technology
  • Computer Graphics and Computer-Aided Design

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