4.6 Article

Ferroelectric tunable balanced right- and left-handed transmission lines

Journal

APPLIED PHYSICS LETTERS
Volume 94, Issue 2, Pages -

Publisher

AMER INST PHYSICS
DOI: 10.1063/1.3068495

Keywords

barium compounds; capacitance; coplanar waveguides; ferroelectric devices; ferroelectric thin films; inductance; permeability; permittivity; strontium compounds

Funding

  1. Centre National d'Etudes Spatiales (CNES)

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The tuning of the dispersion characteristics of a balanced composite right- and left-handed transmission lines is demonstrated at centimeter and millimeter wavelengths. To this aim, coplanar waveguides, periodically loaded by interdigitated capacitances and stublike inductances, were fabricated onto a Ba0.5Sr0.5TiO3 ferroelectric thin film. The scattering parameter measurements show that the lines are left handed from 8 to 18 GHz and right handed above. The results are interpreted by the retrieval of the effective permittivity and permeability, which exhibit Drude-like dispersion characteristics with a magnetic plasma frequency, which can be tuned via the voltage-controlled permittivity variation in the BST thin film.

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