A K-band tunable microstrip bandpass filter using a thin-film conductor/ferroelectric/dielectric multilayer configuration

Author

Subramanyam, Guru ; Van Keuls, Fred ; Miranda, Félix A.

Author_Institution

Northern Iowa Univ., Cedar Falls, IA, USA

Volume

8

Issue

2

fYear

1998

fDate

2/1/1998 12:00:00 AM

Firstpage

78

Lastpage

80

Abstract

We report on a gold/strontium titanate (Au-SrTiO₃) thin-film K-band tunable bandpass filter on a lanthanum aluminate substrate. The two-pole filter has a center frequency of 19 GHz and a 4% bandwidth. Tunability is achieved through the nonlinear temperature dependence and the DC electric field dependence of the relative dielectric constant of SrTiO₃. A center frequency shift of 0.85 GHz was obtained at 400 V DC bias and 77 K without degrading the insertion loss of the filter

Keywords

band-pass filters; ferroelectric devices; ferroelectric thin films; gold; lanthanum compounds; microstrip filters; microwave filters; passive filters; permittivity; strontium compounds; tuning; 19 GHz; 400 V; 77 K; Au-SrTiO₃-LaAlO₃; DC electric field dependence; K-band; LaAlO₃; SHF; nonlinear temperature dependence; relative dielectric constant; thin-film conductor/ferroelectric/dielectric multilayer; tunable microstrip bandpass filter; two-pole filter; Band pass filters; Dielectric thin films; Frequency; Gold; K-band; Lanthanum; Microstrip filters; Strontium; Titanium compounds; Transistors;

fLanguage

English

Journal_Title

Microwave and Guided Wave Letters, IEEE

Publisher

ieee

ISSN

1051-8207

Type

jour

DOI

10.1109/75.658647

Filename

658647