Structural Characteristics of KTa0.5Nb0.5O3 Ferroelectric Thin Films and Applications to Planar Transmission Lines - Archive ouverte HAL Access content directly
Journal Articles Ferroelectrics Year : 2008

Structural Characteristics of KTa0.5Nb0.5O3 Ferroelectric Thin Films and Applications to Planar Transmission Lines

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Abstract

Firstly, we describe a method to improve the thickness uniformity of thin films. Then epitaxial KT0.5Nb0.5O3 films were obtained on MgO and LaAlO3 substrates, whereas films on sapphire are textured. Secondly, we determine numerically the tunability at 10 GHz of different transmission lines printed on a ferroelectric film deposited on sapphire. The ferroelectric film permittivity was varied from 700 to 500. Uniplanar lines (coplanar waveguide and coplanar strips) have a higher tunability (16%) than microstrip lines (2%). Moreover, the definition of a figure of merit, compromise in terms of tunability and insertion loss, shows that the coplanar strips exhibit the best performance.
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Dates and versions

hal-00399876 , version 1 (29-06-2009)

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Arnaud-Gides Moussavou, Stéphanie Députier, Valérie Bouquet, Maryline Guilloux-Viry, André Perrin, et al.. Structural Characteristics of KTa0.5Nb0.5O3 Ferroelectric Thin Films and Applications to Planar Transmission Lines. Ferroelectrics, 2008, 362 (1), pp.137-144. ⟨10.1080/00150190802007143⟩. ⟨hal-00399876⟩
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