Design and Measurement of Reconfigurable Millimeter Wave Reflectarray Cells With Nematic Liquid Crystal

Hu, Wenfei and Cahill, R. and Encinar Garcinuño, José Antonio and Dickie, R and Gamble, H. and Fusco, V. and Grant, N. (2008). Design and Measurement of Reconfigurable Millimeter Wave Reflectarray Cells With Nematic Liquid Crystal. "IEEE Transactions on Antennas and Propagation", v. 56 (n. 10); pp. 3112-3117. ISSN 0018-926X. https://doi.org/10.1109/TAP.2008.929460.

Description

Title: Design and Measurement of Reconfigurable Millimeter Wave Reflectarray Cells With Nematic Liquid Crystal
Author/s:
  • Hu, Wenfei
  • Cahill, R.
  • Encinar Garcinuño, José Antonio
  • Dickie, R
  • Gamble, H.
  • Fusco, V.
  • Grant, N.
Item Type: Article
Título de Revista/Publicación: IEEE Transactions on Antennas and Propagation
Date: October 2008
ISSN: 0018-926X
Volume: 56
Subjects:
Faculty: E.T.S.I. Telecomunicación (UPM)
Department: Electromagnetismo y Teoría de Circuitos [hasta 2014]
UPM's Research Group: Beam scanning arrays , liquid crystals (LCs) , millimeter wave antennas , phase characterization , quasi-optical measurements , reconfigurable antennas , reflectarray
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

Numerical simulations are used to study the electromagnetic scattering from phase agile microstrip reflectarray cells which exploit the voltage controlled dielectric anisotropy property of nematic state liquid crystals (LCs). In the computer model two arrays of equal size elements constructed on a 15 mum thick tuneable LC layer were designed to operate at center frequencies of 102 GHz and 130 GHz. Micromachining processes based on the metallization of quartz/silicon wafers and an industry compatible LCD packaging technique were employed to fabricate the grounded periodic structures. The loss and the phase of the reflected signals were measured using a quasi-optical test bench with the reflectarray inserted at the beam waist of the imaged Gaussian beam, thus eliminating some of the major problems associated with traditional free-space characterization at these frequencies. By applying a low frequency AC bias voltage of 10 V, a 165deg phase shift with a loss 4.5-6.4 dB at 102 GHz and 130deg phase shift with a loss variation between 4.3-7 dB at 130 GHz was obtained. The experimental results are shown to be in close agreement with the computer model.

More information

Item ID: 2760
DC Identifier: http://oa.upm.es/2760/
OAI Identifier: oai:oa.upm.es:2760
DOI: 10.1109/TAP.2008.929460
Official URL: http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=4636831
Deposited by: Archivo Digital UPM
Deposited on: 31 Mar 2010 07:15
Last Modified: 20 Apr 2016 12:25
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