Broad band electromagnetic characterization method of nematic liquid crystals using a coplanar waveguide
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Hinojosa Jiménez, JuanÁrea de conocimiento
ElectrónicaPatrocinadores
J. Hinojosa is grateful to Ministerio de Ciencia y Technología and Region de Murcia Fundación Séneca of Spain for the grants TIC2002-01266 and PB/39/FS/02, which have allowed the present research activity.Fecha de publicación
2005Editorial
Institute Electrical and Electronics Engineers (IEEE)Cita bibliográfica
HINOJOSA JIMÉNEZ, Juan. Broad band electromagnetic characterization method of nematic liquid crystals using a coplanar waveguide. En: IEEE International Conference on Dielectric Liquids (2005: Coimbra, Portugal) IEEE International Conference on Dielectric Liquids: ICDL 2005. Portugal, Coimbra, 26 June-1 July 2005. Coimbra: Institute Electrical and Electronics Engineers, 2005. Pp. 449 - 452. ISBN 0-7803-8954-9Palabras clave
Parámetros-SGuías de ondas coplanar
Función dieléctrica
Materiales dieléctricos
Permitividad
Cristales líquidos Nematic
S-parameters
Dielectric function
Dielectric materials
Permittivity
Nematic liquid crystals
Coplanar waveguide
Resumen
A broad band electromagnetic extraction method of the
dielectric tensor for nematic liquid crystals, associated to a
measuring cell, is presented. The dielectric tensor is computed
from S-parameter measurements obtained at the input planes of
a coplanar waveguide supporting the nematic liquid crystal to be
characterized, which is used as measuring cell. The extraction
method of the dielectric tensor is based on the propagation of the
dominant mode in the measuring cell. It is fast and easy. It uses
analytical relationships, which are presented in this paper. The
simulations results have demonstrated the validity of this
extraction method in the 1GHz-40GHz frequency range for the
electromagnetic characterization of nematic liquid crystals.
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