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Ferroelectric materials are known to be lossy at microwaves. A local microetching technique based on laser ablation is implemented here to reduce the insertion loss of highly tunable devices fabricated on KTa1–xNbxO3 (KTN) ferroelectric thin films. The relevance of this approach is studied in X-band by comparing numerically and experimentally the performance of a frequency-tunable coplanar waveguide...
The investigations reported in this paper constitute three solutions for enhancement of KTa1-xNbxO3 (KTN) ferroelectric material performances displayed by microwave tunable devices. Quasi-epitaxial KTN films with strongly improved microwave performances (especially tunability) were grown on R-sapphire substrates through the use of KNbO3 seed layers. Doping of the KTN layer with two different compounds...
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