Microwave variable delay line using dual-frequency switching-mode liquid crystal

Takao Kuki, Hideo Fujikake, Toshihiro Nomoto

Research output: Contribution to journalArticlepeer-review

90 Citations (Scopus)


A method was investigated to reduce the insertion loss and response time in the phase shift in a microwave variable delay line using liquid crystal (LC). In variable delay lines using conventional nematic LC, reducing the insertion loss conflicts with reducing the phase-shift response-time dependence on the thickness of the LC layer; thus, it is very difficult to simultaneously satisfy both requirements. Here, the use of dual-frequency switching-mode liquid crystal (DFSM LC) for the variable delay line is demonstrated as one approach to solving this problem. By using the characteristics of DFSM LC, in that the alignment of the LC can be controlled with a control voltage and its frequency, it becomes possible to control the LC alignment to be in an always electrically driven condition by applying a combination of control voltages of dc and several kilohertz. Experimental results of a microwave variable delay line using DFSM LC show that it is possible to reduce both the phase-shift response time and insertion loss.

Original languageEnglish
Pages (from-to)2604-2609
Number of pages6
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number11 SPEC
Publication statusPublished - 2002 Nov


  • Dual-frequency switching-mode liquid crystal (DFSM LC)
  • Insertion loss
  • Microwave
  • Phase-shift decay time
  • Variable delay line


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