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A K-band tunable microstrip bandpass filter using a thin-film conductor/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 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

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Microwave and Guided Wave Letters, IEEE  (Volume:8 ,  Issue: 2 )