Accurate and efficient modeling to calculate the voltage dependence of liquid crystal based reflectarray cells

Pérez Palomino, Gerardo and Florencio Díaz, Rafael and Encinar Garcinuño, Jose Antonio and Barba Gea, Mariano and Dickie, Raymond and Cahill, Robert and Baine, Paul and Bain, Michael and Rodríguez Boix, Rafael (2014). Accurate and efficient modeling to calculate the voltage dependence of liquid crystal based reflectarray cells. "IEEE Transactions on Antennas And Propagation", v. 62 (n. 5); pp. 2659-2666. ISSN 0018-926X. https://doi.org/10.1109/TAP.2014.2308521.

Description

Title: Accurate and efficient modeling to calculate the voltage dependence of liquid crystal based reflectarray cells
Author/s:
  • Pérez Palomino, Gerardo
  • Florencio Díaz, Rafael
  • Encinar Garcinuño, Jose Antonio
  • Barba Gea, Mariano
  • Dickie, Raymond
  • Cahill, Robert
  • Baine, Paul
  • Bain, Michael
  • Rodríguez Boix, Rafael
Item Type: Article
Título de Revista/Publicación: IEEE Transactions on Antennas And Propagation
Date: May 2014
ISSN: 0018-926X
Volume: 62
Subjects:
Freetext Keywords: Anisotropy, effective homogeneous tensor, effective permittivity, liquid-crystal (LC), longitudinal inhomogeneity, molecular tilt angle, reconfigurable reflectarray
Faculty: E.T.S.I. Telecomunicación (UPM)
Department: Señales, Sistemas y Radiocomunicaciones
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

Two models which can predict the voltage dependent scattering from Liquid Crystal (LC) based reflectarray cells are presented. The validity of both numerical techniques is demonstrated using measured results in the frequency range 94 - 110 GHz. The most rigorous approach models, for each voltage, the inhomogeneous and anisotropic permittivity of the LC as a stratified media in the direction of the biasing field. This accounts for the different tilt angles of the LC molecules inside the cell calculated from the solution of the elastic problem. The other model is based on an effective homogeneous permittivity tensor that corresponds to the average tilt angle along the longitudinal direction for each biasing voltage. In this model, convergence problems associated with the longitudinal inhomogeneity are avoided and the computation efficiency is improved. Both models provide a correspondence between the reflection coefficient (losses and phase-shift) of the LC-based reflectarray cell and the value of biasing voltage, which can be used to design beam scanning reflectarrays. The accuracy and the efficiency of both models are also analyzed and discussed.

More information

Item ID: 49073
DC Identifier: http://oa.upm.es/49073/
OAI Identifier: oai:oa.upm.es:49073
DOI: 10.1109/TAP.2014.2308521
Official URL: http://ieeexplore.ieee.org/document/6748887/
Deposited by: Memoria Investigacion
Deposited on: 20 Jan 2018 09:30
Last Modified: 20 Jan 2018 09:30
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