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

fYear

2007

fDate

9-12 Oct. 2007

Firstpage

1295

Lastpage

1298

Abstract

In this paper, we report on the performance of microwave phase shifters implemented on sol-gel derived Ba_0.3Sr_0.7TiO₃ (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; Ba_0.3Sr_0.7TiO₃; 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;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Conference, 2007. European

Conference_Location

Munich

Print_ISBN

978-2-87487-001-9

Type

conf

DOI

10.1109/EUMC.2007.4405439

Filename

4405439