A nematic liquid crystal tunable patch antenna

Marios A. Christou; Nectarios C. Papanicolaou; Anastasis C. Polycarpou

doi:10.1109/EuCAP.2014.6902162

A nematic liquid crystal tunable patch antenna

Marios A. Christou, Nectarios C. Papanicolaou, Anastasis C. Polycarpou

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

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 language	English
Title of host publication	8th European Conference on Antennas and Propagation, EuCAP 2014
Publisher	Institute of Electrical and Electronics Engineers Inc.
Pages	1875-1878
Number of pages	4
ISBN (Electronic)	9788890701849
DOIs	https://doi.org/10.1109/EuCAP.2014.6902162
Publication status	Published - 2014
Event	8th European Conference on Antennas and Propagation, EuCAP 2014 - The Hague, Netherlands Duration: 6 Apr 2014 → 11 Apr 2014

Other

Other	8th European Conference on Antennas and Propagation, EuCAP 2014
Country/Territory	Netherlands
City	The Hague
Period	6/04/14 → 11/04/14

Keywords

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

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10.1109/EuCAP.2014.6902162

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title = "A nematic liquid crystal tunable patch antenna",

abstract = "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.",

keywords = "frequency-agile antennas, Nematic liquid crystals, non-linear electromagnetics, tunable patch antennas",

author = "Christou, {Marios A.} and Papanicolaou, {Nectarios C.} and Polycarpou, {Anastasis C.}",

year = "2014",

doi = "10.1109/EuCAP.2014.6902162",

language = "English",

pages = "1875--1878",

booktitle = "8th European Conference on Antennas and Propagation, EuCAP 2014",

publisher = "Institute of Electrical and Electronics Engineers Inc.",

note = "8th European Conference on Antennas and Propagation, EuCAP 2014 ; Conference date: 06-04-2014 Through 11-04-2014",

}

Christou, MA , Papanicolaou, NC & Polycarpou, AC 2014, A nematic liquid crystal tunable patch antenna. in 8th European Conference on Antennas and Propagation, EuCAP 2014., 6902162, Institute of Electrical and Electronics Engineers Inc., pp. 1875-1878, 8th European Conference on Antennas and Propagation, EuCAP 2014, The Hague, Netherlands, 6/04/14. https://doi.org/10.1109/EuCAP.2014.6902162

A nematic liquid crystal tunable patch antenna. / Christou, Marios A.; Papanicolaou, Nectarios C.; Polycarpou, Anastasis C.
8th European Conference on Antennas and Propagation, EuCAP 2014. Institute of Electrical and Electronics Engineers Inc., 2014. p. 1875-1878 6902162.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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AU - Polycarpou, Anastasis C.

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N2 - 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.

AB - 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.

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KW - non-linear electromagnetics

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A nematic liquid crystal tunable patch antenna

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