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

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3 Author(s)
Subramanyam, G. ; Northern Iowa Univ., Cedar Falls, IA, USA ; Van Keuls, F. ; Miranda, F.A.

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 nonlinear DC electric field dependence of the relative dielectric constant of STO (/spl epsiv//sub rSTO/). 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.

Published in:

Microwave Symposium Digest, 1998 IEEE MTT-S International  (Volume:2 )

Date of Conference:

7-12 June 1998