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Experimental characterization of a planar transmission‐line transformer in multilayered high dielectric constant film structure

This article describes the complete experimental characterization of a 10‐mm long planar transmission‐line transformer (TLT) in a multilayered high dielectric constant film structure. The multilayered configuration was obtained by deposition of a high dielectric constant BaTiO3 (BTO) film over the conductors printed on conventional alumina bulk substrates. A transformation impedance level from 50 to 10 Ω could be achieved with comfortable transversal dimensions using this TLT. Frequency and time domain experimental results have confirmed theoretical predictions for this wideband compact device. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1337–1340, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25154