A nematic liquid crystal tunable patch antenna

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


A design for a tunable, frequency-agile antenna is proposed. The structure consists of a microstrip patch and a nematic liquid crystal (N-LC) cell which serves as substrate. The N-LC cell is subject to an applied DC or low-frequency AC electric field. The strength of the bias field alters the tilt-angle of the directors, and thus, affects the relative dielectric tensor of the anisotropic material. The non-linear partial differential equation (PDE) governing the behavior of the directors' field is coupled to Poisson's equation for the electric potential in a non-homogeneous anisotropic medium. The coupled problem is solved iteratively using a finite difference (FD) numerical scheme. It is shown that the resonant frequency of the antenna can be altered using relatively low applied voltages. The obtained results are compared with measurements illustrating the potential use of LCs as tunable materials in microwave and millimeter-wave frequencies.

Original languageEnglish
Title of host publication8th European Conference on Antennas and Propagation, EuCAP 2014
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages4
ISBN (Electronic)9788890701849
Publication statusPublished - 2014
Event8th European Conference on Antennas and Propagation, EuCAP 2014 - The Hague, Netherlands
Duration: 6 Apr 201411 Apr 2014


Other8th European Conference on Antennas and Propagation, EuCAP 2014
CityThe Hague


  • frequency-agile antennas
  • Nematic liquid crystals
  • non-linear electromagnetics
  • tunable patch antennas


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