Faculty Publications

Title

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

Document Type

Conference

Journal/Book/Conference Title

IEEE MTT-S International Microwave Symposium Digest

Volume

2

First Page

1011

Last Page

1014

Abstract

We report on YBCO/strontium titanate (STO) thin film K-band tunable bandpass filters on lanthanum aluminate substrates. The 2 pole filters were designed for a center frequency of 19 GHz and 4% bandwidth. Tunability is achieved through the non-linear dc electric field dependence of the relative dielectric constant of STO (εrSTO). Center frequency shifts greater than 2 GHz were obtained at a 400 V bipolar dc bias at temperatures below 77 K, with minimal degradation in the insertion loss of the filters.

Original Publication Date

1-1-1998

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