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

Hu, Wenfei; Cahill, R.; Encinar Garcinuño, José Antonio; Dickie, R; Gamble, H.; Fusco, V. y 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.

Descripción

Título: Design and Measurement of Reconfigurable Millimeter Wave Reflectarray Cells With Nematic Liquid Crystal
Autor/es:
  • Hu, Wenfei
  • Cahill, R.
  • Encinar Garcinuño, José Antonio
  • Dickie, R
  • Gamble, H.
  • Fusco, V.
  • Grant, N.
Tipo de Documento: Artículo
Título de Revista/Publicación: IEEE Transactions on Antennas and Propagation
Fecha: Octubre 2008
Volumen: 56
Materias:
Escuela: E.T.S.I. Telecomunicación (UPM)
Departamento: Electromagnetismo y Teoría de Circuitos [hasta 2014]
Grupo Investigación UPM: Beam scanning arrays , liquid crystals (LCs) , millimeter wave antennas , phase characterization , quasi-optical measurements , reconfigurable antennas , reflectarray
Licencias Creative Commons: Reconocimiento - Sin obra derivada - No comercial

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Resumen

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.

Más información

ID de Registro: 2760
Identificador DC: http://oa.upm.es/2760/
Identificador OAI: oai:oa.upm.es:2760
Identificador DOI: 10.1109/TAP.2008.929460
URL Oficial: http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=4636831
Depositado por: Archivo Digital UPM
Depositado el: 31 Mar 2010 07:15
Ultima Modificación: 20 Abr 2016 12:25
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