Observatorio de I+D+i UPM

Memorias de investigación
Research Publications in journals:
Accurate and Efficient Modeling to Calculate the Voltage Dependence of Liquid Crystal Based Reflectarray Cells
Year:2014
Research Areas
  • Electronic technology and of the communications
Information
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.
International
Si
JCR
Si
Title
Ieee Transactions on Antennas And Propagation
ISBN
0018-926X
Impact factor JCR
2,459
Impact info
Datos JCR del año 2013
Volume
52
Journal number
From page
2659
To page
2667
Month
SIN MES
Ranking
Participants
  • Autor: Gerardo Perez Palomino (UPM)
  • Autor: Rafael Florencio Díaz (UPM)
  • Autor: Jose Antonio Encinar Garcinuño (UPM)
  • Autor: Mariano Barba Gea (UPM)
  • Autor: Raymond Dickie (Institute of Electronics, Communications and Information Technology, Queen¿s University Belfast)
  • Autor: Robert Cahill (Institute of Electronics, Communications and Information Technology, Queen¿s University Belfast)
  • Autor: Paul Baine (Institute of Electronics, Communications and Information Technology, Queen¿s University Belfast)
  • Autor: Michael Bain (Institute of Electronics, Communications and Information Technology, Queen¿s University Belfast)
  • Autor: Rafael Rodríguez Boix (Universidad de Sevilla)
Research Group, Departaments and Institutes related
  • Creador: Departamento: Señales, Sistemas y Radiocomunicaciones
S2i 2020 Observatorio de investigación @ UPM con la colaboración del Consejo Social UPM
Cofinanciación del MINECO en el marco del Programa INNCIDE 2011 (OTR-2011-0236)
Cofinanciación del MINECO en el marco del Programa INNPACTO (IPT-020000-2010-22)