Title :
Microwave phase shifters based on sol-gel derived Ba0.3Sr0.7TiO3 ferroelectric thin films
Author :
Sherman, Vladimir O. ; Yamada, Tomoaki ; Noeth, Andreas ; Setter, Nava ; Mandeljc, Mira ; Malic, Barbara ; Kosec, Marija ; Vukadinovic, Miso
Author_Institution :
Swiss Fed. Inst. of Technol. at Lausanne, Lausanne
Abstract :
In this paper, we report on the performance of microwave phase shifters implemented on sol-gel derived Ba0.3Sr0.7TiO3 (BST) thin Alms. Coplanar waveguide (CPW) phase shifters, loaded-line phase shifters, and reflection-type digital phase shifters have been realized on a single alumina substrate covered with a 300 nm-thick BST film. The performances of different types of phase shifting cells are compared. It is shown that the optimally designed digital phase shifters have better performance although the digital nature of the operation limits the range of their possible applications. A figure of merit FoM = 100deg/dB at f = 20 GHz and E = 400 kV/cm is demonstrated for the one-bit digital phase shifter.
Keywords :
coplanar waveguides; ferroelectric thin films; microwave phase shifters; sol-gel processing; Al2O3; Ba0.3Sr0.7TiO3; alumina substrate; coplanar waveguide phase shifter; loaded-line phase shifter; microwave phase shifters; reflection-type digital phase shifter; sol-gel derived ferroelectric thin film; Binary search trees; Dielectric constant; Ferroelectric films; Ferroelectric materials; Microwave devices; Microwave measurements; Phase measurement; Phase shifters; Substrates; Transistors; ferroelectrics; phase shifters; tunable;
Conference_Titel :
Microwave Conference, 2007. European
Conference_Location :
Munich
Print_ISBN :
978-2-87487-001-9
DOI :
10.1109/EUMC.2007.4405439
